From d3c9be58e4e97fbf59384acdabb04a33d6a7e996 Mon Sep 17 00:00:00 2001
From: Jackson Ray Hamilton <address@hidden>
Date: Sun, 1 Feb 2015 23:42:01 -0800
Subject: [PATCH] Squashed commits

---
 packages/context-coloring/.elpaignore              |    13 +
 packages/context-coloring/.gitignore               |     2 +
 packages/context-coloring/.travis.yml              |    17 +
 packages/context-coloring/Makefile                 |    31 +
 packages/context-coloring/README.md                |   161 +
 .../benchmark/context-coloring-benchmark.el        |   160 +
 .../benchmark/fixtures/.dir-locals.el              |     1 +
 .../benchmark/fixtures/async-0.9.0.js              |  1123 ++
 .../benchmark/fixtures/jquery-2.1.1.js             |  9190 ++++++++++++++
 .../benchmark/fixtures/lodash-2.4.1.js             |  6785 ++++++++++
 .../benchmark/fixtures/mkdirp-0.5.0.js             |    97 +
 .../context-coloring/context-coloring-themes.el    |   122 +
 packages/context-coloring/context-coloring.el      |   518 +
 .../languages/javascript/.jshintrc                 |    24 +
 .../languages/javascript/binaries/scopifier        |    36 +
 .../languages/javascript/libraries/escope.js       |  1117 ++
 .../languages/javascript/libraries/esprima.js      |  3756 ++++++
 .../languages/javascript/libraries/estraverse.js   |   838 ++
 .../languages/javascript/scopifier.js              |   129 +
 packages/context-coloring/libraries/.dir-locals.el |     2 +
 packages/context-coloring/libraries/ert-async.el   |    89 +
 packages/context-coloring/libraries/js2-mode.el    | 12331 +++++++++++++++++++
 packages/context-coloring/scopifier.png            |   Bin 0 -> 2609 bytes
 packages/context-coloring/screenshot.png           |   Bin 0 -> 22006 bytes
 .../context-coloring/test/context-coloring-test.el |   375 +
 .../context-coloring/test/fixtures/block-scopes.js |     6 +
 packages/context-coloring/test/fixtures/catch.js   |     8 +
 .../test/fixtures/comments-and-strings.js          |     3 +
 .../test/fixtures/function-scopes.js               |     5 +
 packages/context-coloring/test/fixtures/global.js  |     3 +
 .../context-coloring/test/fixtures/key-names.js    |     6 +
 .../context-coloring/test/fixtures/key-values.js   |     8 +
 .../test/fixtures/property-lookup.js               |     5 +
 33 files changed, 36961 insertions(+)
 create mode 100644 packages/context-coloring/.elpaignore
 create mode 100644 packages/context-coloring/.gitignore
 create mode 100644 packages/context-coloring/.travis.yml
 create mode 100644 packages/context-coloring/Makefile
 create mode 100644 packages/context-coloring/README.md
 create mode 100644 packages/context-coloring/benchmark/context-coloring-benchmark.el
 create mode 100644 packages/context-coloring/benchmark/fixtures/.dir-locals.el
 create mode 100644 packages/context-coloring/benchmark/fixtures/async-0.9.0.js
 create mode 100644 packages/context-coloring/benchmark/fixtures/jquery-2.1.1.js
 create mode 100644 packages/context-coloring/benchmark/fixtures/lodash-2.4.1.js
 create mode 100644 packages/context-coloring/benchmark/fixtures/mkdirp-0.5.0.js
 create mode 100644 packages/context-coloring/context-coloring-themes.el
 create mode 100644 packages/context-coloring/context-coloring.el
 create mode 100644 packages/context-coloring/languages/javascript/.jshintrc
 create mode 100755 packages/context-coloring/languages/javascript/binaries/scopifier
 create mode 100644 packages/context-coloring/languages/javascript/libraries/escope.js
 create mode 100644 packages/context-coloring/languages/javascript/libraries/esprima.js
 create mode 100644 packages/context-coloring/languages/javascript/libraries/estraverse.js
 create mode 100644 packages/context-coloring/languages/javascript/scopifier.js
 create mode 100644 packages/context-coloring/libraries/.dir-locals.el
 create mode 100644 packages/context-coloring/libraries/ert-async.el
 create mode 100644 packages/context-coloring/libraries/js2-mode.el
 create mode 100644 packages/context-coloring/scopifier.png
 create mode 100644 packages/context-coloring/screenshot.png
 create mode 100644 packages/context-coloring/test/context-coloring-test.el
 create mode 100644 packages/context-coloring/test/fixtures/block-scopes.js
 create mode 100644 packages/context-coloring/test/fixtures/catch.js
 create mode 100644 packages/context-coloring/test/fixtures/comments-and-strings.js
 create mode 100644 packages/context-coloring/test/fixtures/function-scopes.js
 create mode 100644 packages/context-coloring/test/fixtures/global.js
 create mode 100644 packages/context-coloring/test/fixtures/key-names.js
 create mode 100644 packages/context-coloring/test/fixtures/key-values.js
 create mode 100644 packages/context-coloring/test/fixtures/property-lookup.js

diff --git a/packages/context-coloring/.elpaignore b/packages/context-coloring/.elpaignore
new file mode 100644
index 0000000..5b2e6d9
--- /dev/null
+++ b/packages/context-coloring/.elpaignore
@@ -0,0 +1,13 @@
+.elpaignore
+.gitignore
+.jshintrc
+.travis.yml
+Makefile
+README.md
+benchmark
+libraries/.dir-locals.el
+libraries/ert-async.el
+libraries/js2-mode.el
+scopifier.png
+screenshot.png
+test
diff --git a/packages/context-coloring/.gitignore b/packages/context-coloring/.gitignore
new file mode 100644
index 0000000..d9c77ef
--- /dev/null
+++ b/packages/context-coloring/.gitignore
@@ -0,0 +1,2 @@
+*.elc
+/benchmark/logs/
diff --git a/packages/context-coloring/.travis.yml b/packages/context-coloring/.travis.yml
new file mode 100644
index 0000000..a3b3615
--- /dev/null
+++ b/packages/context-coloring/.travis.yml
@@ -0,0 +1,17 @@
+# https://github.com/rolandwalker/emacs-travis
+
+language: emacs-lisp
+
+env:
+  matrix:
+    - EMACS=emacs24
+
+install:
+  - if [ "$EMACS" = "emacs24" ]; then
+        sudo add-apt-repository -y ppa:cassou/emacs &&
+        sudo apt-get update -qq &&
+        sudo apt-get install -qq emacs24 emacs24-el;
+    fi
+
+script:
+  make test EMACS=${EMACS}
diff --git a/packages/context-coloring/Makefile b/packages/context-coloring/Makefile
new file mode 100644
index 0000000..e718601
--- /dev/null
+++ b/packages/context-coloring/Makefile
@@ -0,0 +1,31 @@
+EMACS = emacs
+
+all: clean compile test
+
+bench:
+	${EMACS} -Q \
+	-L . \
+	-L libraries \
+	-l context-coloring \
+	-l benchmark/context-coloring-benchmark \
+	-f context-coloring-benchmark-run
+
+compile:
+	${EMACS} -Q -batch \
+	-L libraries \
+	-f batch-byte-compile *.el libraries/*.el
+
+clean:
+	rm -f *.elc libraries/*.elc
+
+test:
+	${EMACS} -Q -batch \
+	-L . \
+	-L libraries \
+	-l ert \
+	-l ert-async \
+	-l context-coloring \
+	-l test/context-coloring-test.el \
+	-f ert-run-tests-batch-and-exit
+
+.PHONY: all bench compile clean test
diff --git a/packages/context-coloring/README.md b/packages/context-coloring/README.md
new file mode 100644
index 0000000..c31f895
--- /dev/null
+++ b/packages/context-coloring/README.md
@@ -0,0 +1,161 @@
+# Context Coloring [![Build Status](https://travis-ci.org/jacksonrayhamilton/context-coloring.png?branch=develop)](https://travis-ci.org/jacksonrayhamilton/context-coloring)
+
+<p align="center">
+  <img alt="Screenshot of JavaScript code highlighted by context." src="screenshot.png" title="Screenshot">
+</p>
+
+Highlights code according to function context.
+
+- Code in the global scope is one color. Code in functions within the global
+  scope is a different color, and code within such functions is another color,
+  and so on.
+- Identifiers retain the color of the scope in which they are declared.
+
+Lexical scope information at-a-glance can assist a programmer in understanding
+the overall structure of a program. It can help to curb nasty bugs like name
+shadowing. A rainbow can indicate excessive complexity. State change within a
+closure is easily monitored.
+
+By default, Context Coloring still highlights comments and strings
+syntactically. It is still easy to differentiate code from non-code, and strings
+cannot be confused for variables.
+
+This coloring strategy is probably more useful than conventional syntax
+highlighting. Highlighting keywords can help one to detect spelling errors, but
+a [linter][] could also spot those errors, and if integrated with [flycheck][],
+an extra spot opens up in your editing toolbelt.
+
+Give context coloring a try; you may find that it *changes the way you write
+code*.
+
+## Features
+
+- Supported languages: JavaScript
+- Light and dark (customizable) color schemes.
+- Very fast for files under 1000 lines.
+
+## Installation
+
+Requires Emacs 24+.
+
+JavaScript language support requires either [js2-mode][] or
+[Node.js 0.10+][node], respectively.
+
+### ELPA
+
+- `M-x package-refresh-contents RET`
+- `M-x package-install RET context-coloring RET`
+
+### Git
+
+- Clone this repository.
+
+```bash
+cd ~/.emacs.d/
+git clone https://github.com/jacksonrayhamilton/context-coloring.git
+```
+
+- Byte-compile the package for improved speed.
+
+```bash
+cd context-coloring/
+make compile
+```
+
+- Add the following to your `~/.emacs` file:
+
+```lisp
+(add-to-list 'load-path "~/.emacs.d/context-coloring")
+(require 'context-coloring)
+(add-hook 'js-mode-hook 'context-coloring-mode)
+```
+
+## Customizing
+
+Built-in themes are accessible via `context-coloring-load-theme`.  Available
+themes are: `monokai`, `solarized`, `tango` and `zenburn`.
+
+```lisp
+(require 'context-coloring)
+(context-coloring-load-theme 'zenburn)
+```
+
+You can define your own themes, too:
+
+```lisp
+(context-coloring-define-theme
+ 'zenburn
+ :colors '("#DCDCCC"
+           "#93E0E3"
+           "#BFEBBF"
+           "#F0DFAF"
+           "#DFAF8F"
+           "#CC9393"
+           "#DC8CC3"
+           "#94BFF3"
+           "#9FC59F"
+           "#D0BF8F"
+           "#DCA3A3"))
+```
+
+## Extending
+
+To add support for a new language, write a "scopifier" for it, and define a new
+coloring dispatch strategy with `context-coloring-define-dispatch`. Then the
+plugin should handle the rest.
+
+A "scopifier" is a CLI program that reads a buffer's contents from stdin and
+writes a JSON array of numbers to stdout. Every three numbers in the array
+represent a range of color. For instance, if I fed the following string of
+JavaScript code to a scopifier,
+
+```js
+var a = function () {};
+```
+
+then the scopifier would produce the following array:
+
+```js
+[1,24,0,9,23,1]
+```
+
+Where, for every three numbers, the first number is a 1-indexed start [point][],
+the second number is an exclusive end point, and the third number is a scope
+level. The result of applying level 0 coloring to the range &#91;1, 24) and then
+applying level 1 coloring to the range &#91;9, 23) would result in the following
+coloring:
+
+<p align="center">
+  <img alt="Screenshot of ranges &#91;1, 24) and &#91;9, 23)." src="scopifier.png" title="Screenshot">
+</p>
+
+If there is an abstract syntax tree generator for your language, you can walk
+the syntax tree, find variables and scopes, and build their positions and levels
+into an array like the one above.
+
+For example, a Ruby scopifier might be defined and implemented like this:
+
+```lisp
+(context-coloring-define-dispatch
+ 'ruby
+ :modes '(ruby-mode)
+ :executable "ruby"
+ :command "/home/username/scopifier")
+```
+
+```ruby
+#!/usr/bin/env ruby
+def scopifier(code)
+    # Parse code.
+    # Return an array.
+end
+print scopifier ARGF.read
+```
+
+[linter]: http://jshint.com/about/
+[flycheck]: http://www.flycheck.org/
+[zenburn]: http://github.com/bbatsov/zenburn-emacs
+[point]: http://www.gnu.org/software/emacs/manual/html_node/elisp/Point.html
+[js2-mode]: https://github.com/mooz/js2-mode
+[node]: http://nodejs.org/download/
+[load path]: https://www.gnu.org/software/emacs/manual/html_node/emacs/Lisp-Libraries.html
diff --git a/packages/context-coloring/benchmark/context-coloring-benchmark.el b/packages/context-coloring/benchmark/context-coloring-benchmark.el
new file mode 100644
index 0000000..004b66f
--- /dev/null
+++ b/packages/context-coloring/benchmark/context-coloring-benchmark.el
@@ -0,0 +1,160 @@
+;;; benchmark/context-coloring-benchmark.el --- Benchmarks for context coloring. -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(defconst context-coloring-benchmark-path
+  (file-name-directory (or load-file-name buffer-file-name))
+  "This file's directory.")
+
+(defun context-coloring-benchmark-resolve-path (path)
+  "Resolve PATH from this file's directory."
+  (expand-file-name path context-coloring-benchmark-path))
+
+(defun context-coloring-benchmark-log-results (result-file fixture)
+  "Log benchmarking results for FIXTURE to RESULT-FILE."
+  (elp-results)
+  (let ((results-buffer (current-buffer)))
+    (with-temp-buffer
+      (insert (concat fixture "\n"))
+      (prepend-to-buffer results-buffer (point-min) (point-max)))
+    (with-temp-buffer
+      (insert "\n")
+      (append-to-buffer results-buffer (point-min) (point-max))))
+  (make-directory (context-coloring-benchmark-resolve-path "./logs") t)
+  (append-to-file nil nil result-file))
+
+(defun context-coloring-benchmark-next-tick (function)
+  "Defer execution of FUNCTION to clear the stack and to ensure
+asynchrony."
+  (run-at-time 0.001 nil function))
+
+(defun context-coloring-benchmark-next (list continue stop)
+  "Run the next test in LIST by calling CONTINUE.  When LIST is
+exhausted, call STOP instead."
+  (if (null list)
+      (context-coloring-benchmark-next-tick stop)
+    (context-coloring-benchmark-next-tick
+     (lambda ()
+       (funcall
+        continue
+        (car list)
+        (lambda ()
+          (context-coloring-benchmark-next (cdr list) continue stop)))))))
+
+(defun context-coloring-benchmark-async (title setup teardown fixtures callback)
+  "Measure the performance of all FIXTURES, calling CALLBACK when
+all are done."
+  (funcall setup)
+  (let ((result-file (context-coloring-benchmark-resolve-path
+                      (format "./logs/results-%s-%s.log"
+                              title (format-time-string "%s")))))
+    (context-coloring-benchmark-next
+     fixtures
+     (lambda (path next)
+       (let ((fixture (context-coloring-benchmark-resolve-path path))
+             advice)
+         (setq
+          advice
+          (let ((count 0))
+            (lambda (original-function)
+              (funcall
+               original-function
+               (lambda ()
+                 (setq count (+ count 1))
+                 ;; Test 5 times.
+                 (if (= count 5)
+                     (progn
+                       (advice-remove 'context-coloring-colorize advice)
+                       (kill-buffer)
+                       (context-coloring-benchmark-log-results
+                        result-file
+                        fixture)
+                       (funcall next))
+                   (funcall 'context-coloring-colorize)))))))
+         (advice-add 'context-coloring-colorize :around advice)
+         (find-file fixture)))
+     (lambda ()
+       (funcall teardown)
+       (if callback (funcall callback))))))
+
+(defconst context-coloring-benchmark-js-fixtures
+  '("./fixtures/jquery-2.1.1.js"
+    "./fixtures/lodash-2.4.1.js"
+    "./fixtures/async-0.9.0.js"
+    "./fixtures/mkdirp-0.5.0.js")
+  "Arbitrary JavaScript files for performance scrutiny.")
+
+(defun context-coloring-benchmark-js-mode-setup ()
+  "Preparation logic for `js-mode'."
+  (add-hook 'js-mode-hook 'context-coloring-mode)
+  (elp-instrument-package "context-coloring-"))
+
+(defun context-coloring-benchmark-js-mode-teardown ()
+  "Cleanup logic for `js-mode'."
+  (remove-hook 'js-mode-hook 'context-coloring-mode))
+
+(defun context-coloring-benchmark-js-mode-run (callback)
+  "Benchmark `js-mode', then call CALLBACK."
+  (context-coloring-benchmark-async
+   "js-mode"
+   'context-coloring-benchmark-js-mode-setup
+   'context-coloring-benchmark-js-mode-teardown
+   context-coloring-benchmark-js-fixtures
+   callback))
+
+(defun context-coloring-benchmark-js2-mode-setup ()
+  "Preparation logic for `js2-mode'."
+  (require 'js2-mode)
+  (setq js2-mode-show-parse-errors nil)
+  (setq js2-mode-show-strict-warnings nil)
+  (add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))
+  (add-hook 'js2-mode-hook 'context-coloring-mode)
+  (elp-instrument-package "context-coloring-"))
+
+(defun context-coloring-benchmark-js2-mode-teardown ()
+  "Cleanup logic for `js2-mode'."
+  (remove-hook 'js2-mode-hook 'context-coloring-mode)
+  (setq auto-mode-alist (delete '("\\.js\\'" . js2-mode)
+                                auto-mode-alist))
+  (setq js2-mode-show-strict-warnings t)
+  (setq js2-mode-show-parse-errors t))
+
+(defun context-coloring-benchmark-js2-mode-run (callback)
+  "Benchmark `js2-mode', then call CALLBACK."
+  (context-coloring-benchmark-async
+   "js2-mode"
+   'context-coloring-benchmark-js2-mode-setup
+   'context-coloring-benchmark-js2-mode-teardown
+   context-coloring-benchmark-js-fixtures
+   callback))
+
+(defun context-coloring-benchmark-run ()
+  "Benchmark all modes, then exit."
+  (context-coloring-benchmark-next
+   '(context-coloring-benchmark-js-mode-run
+     context-coloring-benchmark-js2-mode-run)
+   (lambda (function next)
+     (funcall function next))
+   (lambda ()
+     (kill-emacs))))
+
+(provide 'context-coloring-benchmark)
+
+;;; context-coloring-benchmark.el ends here
diff --git a/packages/context-coloring/benchmark/fixtures/.dir-locals.el b/packages/context-coloring/benchmark/fixtures/.dir-locals.el
new file mode 100644
index 0000000..f3d5e97
--- /dev/null
+++ b/packages/context-coloring/benchmark/fixtures/.dir-locals.el
@@ -0,0 +1 @@
+((nil . ((buffer-read-only . t))))
diff --git a/packages/context-coloring/benchmark/fixtures/async-0.9.0.js b/packages/context-coloring/benchmark/fixtures/async-0.9.0.js
new file mode 100644
index 0000000..01e8afc
--- /dev/null
+++ b/packages/context-coloring/benchmark/fixtures/async-0.9.0.js
@@ -0,0 +1,1123 @@
+/*!
+ * async
+ * https://github.com/caolan/async
+ *
+ * Copyright 2010-2014 Caolan McMahon
+ * Released under the MIT license
+ */
+/*jshint onevar: false, indent:4 */
+/*global setImmediate: false, setTimeout: false, console: false */
+(function () {
+
+    var async = {};
+
+    // global on the server, window in the browser
+    var root, previous_async;
+
+    root = this;
+    if (root != null) {
+      previous_async = root.async;
+    }
+
+    async.noConflict = function () {
+        root.async = previous_async;
+        return async;
+    };
+
+    function only_once(fn) {
+        var called = false;
+        return function() {
+            if (called) throw new Error("Callback was already called.");
+            called = true;
+            fn.apply(root, arguments);
+        }
+    }
+
+    //// cross-browser compatiblity functions ////
+
+    var _toString = Object.prototype.toString;
+
+    var _isArray = Array.isArray || function (obj) {
+        return _toString.call(obj) === '[object Array]';
+    };
+
+    var _each = function (arr, iterator) {
+        if (arr.forEach) {
+            return arr.forEach(iterator);
+        }
+        for (var i = 0; i < arr.length; i += 1) {
+            iterator(arr[i], i, arr);
+        }
+    };
+
+    var _map = function (arr, iterator) {
+        if (arr.map) {
+            return arr.map(iterator);
+        }
+        var results = [];
+        _each(arr, function (x, i, a) {
+            results.push(iterator(x, i, a));
+        });
+        return results;
+    };
+
+    var _reduce = function (arr, iterator, memo) {
+        if (arr.reduce) {
+            return arr.reduce(iterator, memo);
+        }
+        _each(arr, function (x, i, a) {
+            memo = iterator(memo, x, i, a);
+        });
+        return memo;
+    };
+
+    var _keys = function (obj) {
+        if (Object.keys) {
+            return Object.keys(obj);
+        }
+        var keys = [];
+        for (var k in obj) {
+            if (obj.hasOwnProperty(k)) {
+                keys.push(k);
+            }
+        }
+        return keys;
+    };
+
+    //// exported async module functions ////
+
+    //// nextTick implementation with browser-compatible fallback ////
+    if (typeof process === 'undefined' || !(process.nextTick)) {
+        if (typeof setImmediate === 'function') {
+            async.nextTick = function (fn) {
+                // not a direct alias for IE10 compatibility
+                setImmediate(fn);
+            };
+            async.setImmediate = async.nextTick;
+        }
+        else {
+            async.nextTick = function (fn) {
+                setTimeout(fn, 0);
+            };
+            async.setImmediate = async.nextTick;
+        }
+    }
+    else {
+        async.nextTick = process.nextTick;
+        if (typeof setImmediate !== 'undefined') {
+            async.setImmediate = function (fn) {
+              // not a direct alias for IE10 compatibility
+              setImmediate(fn);
+            };
+        }
+        else {
+            async.setImmediate = async.nextTick;
+        }
+    }
+
+    async.each = function (arr, iterator, callback) {
+        callback = callback || function () {};
+        if (!arr.length) {
+            return callback();
+        }
+        var completed = 0;
+        _each(arr, function (x) {
+            iterator(x, only_once(done) );
+        });
+        function done(err) {
+          if (err) {
+              callback(err);
+              callback = function () {};
+          }
+          else {
+              completed += 1;
+              if (completed >= arr.length) {
+                  callback();
+              }
+          }
+        }
+    };
+    async.forEach = async.each;
+
+    async.eachSeries = function (arr, iterator, callback) {
+        callback = callback || function () {};
+        if (!arr.length) {
+            return callback();
+        }
+        var completed = 0;
+        var iterate = function () {
+            iterator(arr[completed], function (err) {
+                if (err) {
+                    callback(err);
+                    callback = function () {};
+                }
+                else {
+                    completed += 1;
+                    if (completed >= arr.length) {
+                        callback();
+                    }
+                    else {
+                        iterate();
+                    }
+                }
+            });
+        };
+        iterate();
+    };
+    async.forEachSeries = async.eachSeries;
+
+    async.eachLimit = function (arr, limit, iterator, callback) {
+        var fn = _eachLimit(limit);
+        fn.apply(null, [arr, iterator, callback]);
+    };
+    async.forEachLimit = async.eachLimit;
+
+    var _eachLimit = function (limit) {
+
+        return function (arr, iterator, callback) {
+            callback = callback || function () {};
+            if (!arr.length || limit <= 0) {
+                return callback();
+            }
+            var completed = 0;
+            var started = 0;
+            var running = 0;
+
+            (function replenish () {
+                if (completed >= arr.length) {
+                    return callback();
+                }
+
+                while (running < limit && started < arr.length) {
+                    started += 1;
+                    running += 1;
+                    iterator(arr[started - 1], function (err) {
+                        if (err) {
+                            callback(err);
+                            callback = function () {};
+                        }
+                        else {
+                            completed += 1;
+                            running -= 1;
+                            if (completed >= arr.length) {
+                                callback();
+                            }
+                            else {
+                                replenish();
+                            }
+                        }
+                    });
+                }
+            })();
+        };
+    };
+
+
+    var doParallel = function (fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [async.each].concat(args));
+        };
+    };
+    var doParallelLimit = function(limit, fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [_eachLimit(limit)].concat(args));
+        };
+    };
+    var doSeries = function (fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [async.eachSeries].concat(args));
+        };
+    };
+
+
+    var _asyncMap = function (eachfn, arr, iterator, callback) {
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        if (!callback) {
+            eachfn(arr, function (x, callback) {
+                iterator(x.value, function (err) {
+                    callback(err);
+                });
+            });
+        } else {
+            var results = [];
+            eachfn(arr, function (x, callback) {
+                iterator(x.value, function (err, v) {
+                    results[x.index] = v;
+                    callback(err);
+                });
+            }, function (err) {
+                callback(err, results);
+            });
+        }
+    };
+    async.map = doParallel(_asyncMap);
+    async.mapSeries = doSeries(_asyncMap);
+    async.mapLimit = function (arr, limit, iterator, callback) {
+        return _mapLimit(limit)(arr, iterator, callback);
+    };
+
+    var _mapLimit = function(limit) {
+        return doParallelLimit(limit, _asyncMap);
+    };
+
+    // reduce only has a series version, as doing reduce in parallel won't
+    // work in many situations.
+    async.reduce = function (arr, memo, iterator, callback) {
+        async.eachSeries(arr, function (x, callback) {
+            iterator(memo, x, function (err, v) {
+                memo = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, memo);
+        });
+    };
+    // inject alias
+    async.inject = async.reduce;
+    // foldl alias
+    async.foldl = async.reduce;
+
+    async.reduceRight = function (arr, memo, iterator, callback) {
+        var reversed = _map(arr, function (x) {
+            return x;
+        }).reverse();
+        async.reduce(reversed, memo, iterator, callback);
+    };
+    // foldr alias
+    async.foldr = async.reduceRight;
+
+    var _filter = function (eachfn, arr, iterator, callback) {
+        var results = [];
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        eachfn(arr, function (x, callback) {
+            iterator(x.value, function (v) {
+                if (v) {
+                    results.push(x);
+                }
+                callback();
+            });
+        }, function (err) {
+            callback(_map(results.sort(function (a, b) {
+                return a.index - b.index;
+            }), function (x) {
+                return x.value;
+            }));
+        });
+    };
+    async.filter = doParallel(_filter);
+    async.filterSeries = doSeries(_filter);
+    // select alias
+    async.select = async.filter;
+    async.selectSeries = async.filterSeries;
+
+    var _reject = function (eachfn, arr, iterator, callback) {
+        var results = [];
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        eachfn(arr, function (x, callback) {
+            iterator(x.value, function (v) {
+                if (!v) {
+                    results.push(x);
+                }
+                callback();
+            });
+        }, function (err) {
+            callback(_map(results.sort(function (a, b) {
+                return a.index - b.index;
+            }), function (x) {
+                return x.value;
+            }));
+        });
+    };
+    async.reject = doParallel(_reject);
+    async.rejectSeries = doSeries(_reject);
+
+    var _detect = function (eachfn, arr, iterator, main_callback) {
+        eachfn(arr, function (x, callback) {
+            iterator(x, function (result) {
+                if (result) {
+                    main_callback(x);
+                    main_callback = function () {};
+                }
+                else {
+                    callback();
+                }
+            });
+        }, function (err) {
+            main_callback();
+        });
+    };
+    async.detect = doParallel(_detect);
+    async.detectSeries = doSeries(_detect);
+
+    async.some = function (arr, iterator, main_callback) {
+        async.each(arr, function (x, callback) {
+            iterator(x, function (v) {
+                if (v) {
+                    main_callback(true);
+                    main_callback = function () {};
+                }
+                callback();
+            });
+        }, function (err) {
+            main_callback(false);
+        });
+    };
+    // any alias
+    async.any = async.some;
+
+    async.every = function (arr, iterator, main_callback) {
+        async.each(arr, function (x, callback) {
+            iterator(x, function (v) {
+                if (!v) {
+                    main_callback(false);
+                    main_callback = function () {};
+                }
+                callback();
+            });
+        }, function (err) {
+            main_callback(true);
+        });
+    };
+    // all alias
+    async.all = async.every;
+
+    async.sortBy = function (arr, iterator, callback) {
+        async.map(arr, function (x, callback) {
+            iterator(x, function (err, criteria) {
+                if (err) {
+                    callback(err);
+                }
+                else {
+                    callback(null, {value: x, criteria: criteria});
+                }
+            });
+        }, function (err, results) {
+            if (err) {
+                return callback(err);
+            }
+            else {
+                var fn = function (left, right) {
+                    var a = left.criteria, b = right.criteria;
+                    return a < b ? -1 : a > b ? 1 : 0;
+                };
+                callback(null, _map(results.sort(fn), function (x) {
+                    return x.value;
+                }));
+            }
+        });
+    };
+
+    async.auto = function (tasks, callback) {
+        callback = callback || function () {};
+        var keys = _keys(tasks);
+        var remainingTasks = keys.length
+        if (!remainingTasks) {
+            return callback();
+        }
+
+        var results = {};
+
+        var listeners = [];
+        var addListener = function (fn) {
+            listeners.unshift(fn);
+        };
+        var removeListener = function (fn) {
+            for (var i = 0; i < listeners.length; i += 1) {
+                if (listeners[i] === fn) {
+                    listeners.splice(i, 1);
+                    return;
+                }
+            }
+        };
+        var taskComplete = function () {
+            remainingTasks--
+            _each(listeners.slice(0), function (fn) {
+                fn();
+            });
+        };
+
+        addListener(function () {
+            if (!remainingTasks) {
+                var theCallback = callback;
+                // prevent final callback from calling itself if it errors
+                callback = function () {};
+
+                theCallback(null, results);
+            }
+        });
+
+        _each(keys, function (k) {
+            var task = _isArray(tasks[k]) ? tasks[k]: [tasks[k]];
+            var taskCallback = function (err) {
+                var args = Array.prototype.slice.call(arguments, 1);
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                if (err) {
+                    var safeResults = {};
+                    _each(_keys(results), function(rkey) {
+                        safeResults[rkey] = results[rkey];
+                    });
+                    safeResults[k] = args;
+                    callback(err, safeResults);
+                    // stop subsequent errors hitting callback multiple times
+                    callback = function () {};
+                }
+                else {
+                    results[k] = args;
+                    async.setImmediate(taskComplete);
+                }
+            };
+            var requires = task.slice(0, Math.abs(task.length - 1)) || [];
+            var ready = function () {
+                return _reduce(requires, function (a, x) {
+                    return (a && results.hasOwnProperty(x));
+                }, true) && !results.hasOwnProperty(k);
+            };
+            if (ready()) {
+                task[task.length - 1](taskCallback, results);
+            }
+            else {
+                var listener = function () {
+                    if (ready()) {
+                        removeListener(listener);
+                        task[task.length - 1](taskCallback, results);
+                    }
+                };
+                addListener(listener);
+            }
+        });
+    };
+
+    async.retry = function(times, task, callback) {
+        var DEFAULT_TIMES = 5;
+        var attempts = [];
+        // Use defaults if times not passed
+        if (typeof times === 'function') {
+            callback = task;
+            task = times;
+            times = DEFAULT_TIMES;
+        }
+        // Make sure times is a number
+        times = parseInt(times, 10) || DEFAULT_TIMES;
+        var wrappedTask = function(wrappedCallback, wrappedResults) {
+            var retryAttempt = function(task, finalAttempt) {
+                return function(seriesCallback) {
+                    task(function(err, result){
+                        seriesCallback(!err || finalAttempt, {err: err, result: result});
+                    }, wrappedResults);
+                };
+            };
+            while (times) {
+                attempts.push(retryAttempt(task, !(times-=1)));
+            }
+            async.series(attempts, function(done, data){
+                data = data[data.length - 1];
+                (wrappedCallback || callback)(data.err, data.result);
+            });
+        }
+        // If a callback is passed, run this as a controll flow
+        return callback ? wrappedTask() : wrappedTask
+    };
+
+    async.waterfall = function (tasks, callback) {
+        callback = callback || function () {};
+        if (!_isArray(tasks)) {
+          var err = new Error('First argument to waterfall must be an array of functions');
+          return callback(err);
+        }
+        if (!tasks.length) {
+            return callback();
+        }
+        var wrapIterator = function (iterator) {
+            return function (err) {
+                if (err) {
+                    callback.apply(null, arguments);
+                    callback = function () {};
+                }
+                else {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    var next = iterator.next();
+                    if (next) {
+                        args.push(wrapIterator(next));
+                    }
+                    else {
+                        args.push(callback);
+                    }
+                    async.setImmediate(function () {
+                        iterator.apply(null, args);
+                    });
+                }
+            };
+        };
+        wrapIterator(async.iterator(tasks))();
+    };
+
+    var _parallel = function(eachfn, tasks, callback) {
+        callback = callback || function () {};
+        if (_isArray(tasks)) {
+            eachfn.map(tasks, function (fn, callback) {
+                if (fn) {
+                    fn(function (err) {
+                        var args = Array.prototype.slice.call(arguments, 1);
+                        if (args.length <= 1) {
+                            args = args[0];
+                        }
+                        callback.call(null, err, args);
+                    });
+                }
+            }, callback);
+        }
+        else {
+            var results = {};
+            eachfn.each(_keys(tasks), function (k, callback) {
+                tasks[k](function (err) {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    if (args.length <= 1) {
+                        args = args[0];
+                    }
+                    results[k] = args;
+                    callback(err);
+                });
+            }, function (err) {
+                callback(err, results);
+            });
+        }
+    };
+
+    async.parallel = function (tasks, callback) {
+        _parallel({ map: async.map, each: async.each }, tasks, callback);
+    };
+
+    async.parallelLimit = function(tasks, limit, callback) {
+        _parallel({ map: _mapLimit(limit), each: _eachLimit(limit) }, tasks, callback);
+    };
+
+    async.series = function (tasks, callback) {
+        callback = callback || function () {};
+        if (_isArray(tasks)) {
+            async.mapSeries(tasks, function (fn, callback) {
+                if (fn) {
+                    fn(function (err) {
+                        var args = Array.prototype.slice.call(arguments, 1);
+                        if (args.length <= 1) {
+                            args = args[0];
+                        }
+                        callback.call(null, err, args);
+                    });
+                }
+            }, callback);
+        }
+        else {
+            var results = {};
+            async.eachSeries(_keys(tasks), function (k, callback) {
+                tasks[k](function (err) {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    if (args.length <= 1) {
+                        args = args[0];
+                    }
+                    results[k] = args;
+                    callback(err);
+                });
+            }, function (err) {
+                callback(err, results);
+            });
+        }
+    };
+
+    async.iterator = function (tasks) {
+        var makeCallback = function (index) {
+            var fn = function () {
+                if (tasks.length) {
+                    tasks[index].apply(null, arguments);
+                }
+                return fn.next();
+            };
+            fn.next = function () {
+                return (index < tasks.length - 1) ? makeCallback(index + 1): null;
+            };
+            return fn;
+        };
+        return makeCallback(0);
+    };
+
+    async.apply = function (fn) {
+        var args = Array.prototype.slice.call(arguments, 1);
+        return function () {
+            return fn.apply(
+                null, args.concat(Array.prototype.slice.call(arguments))
+            );
+        };
+    };
+
+    var _concat = function (eachfn, arr, fn, callback) {
+        var r = [];
+        eachfn(arr, function (x, cb) {
+            fn(x, function (err, y) {
+                r = r.concat(y || []);
+                cb(err);
+            });
+        }, function (err) {
+            callback(err, r);
+        });
+    };
+    async.concat = doParallel(_concat);
+    async.concatSeries = doSeries(_concat);
+
+    async.whilst = function (test, iterator, callback) {
+        if (test()) {
+            iterator(function (err) {
+                if (err) {
+                    return callback(err);
+                }
+                async.whilst(test, iterator, callback);
+            });
+        }
+        else {
+            callback();
+        }
+    };
+
+    async.doWhilst = function (iterator, test, callback) {
+        iterator(function (err) {
+            if (err) {
+                return callback(err);
+            }
+            var args = Array.prototype.slice.call(arguments, 1);
+            if (test.apply(null, args)) {
+                async.doWhilst(iterator, test, callback);
+            }
+            else {
+                callback();
+            }
+        });
+    };
+
+    async.until = function (test, iterator, callback) {
+        if (!test()) {
+            iterator(function (err) {
+                if (err) {
+                    return callback(err);
+                }
+                async.until(test, iterator, callback);
+            });
+        }
+        else {
+            callback();
+        }
+    };
+
+    async.doUntil = function (iterator, test, callback) {
+        iterator(function (err) {
+            if (err) {
+                return callback(err);
+            }
+            var args = Array.prototype.slice.call(arguments, 1);
+            if (!test.apply(null, args)) {
+                async.doUntil(iterator, test, callback);
+            }
+            else {
+                callback();
+            }
+        });
+    };
+
+    async.queue = function (worker, concurrency) {
+        if (concurrency === undefined) {
+            concurrency = 1;
+        }
+        function _insert(q, data, pos, callback) {
+          if (!q.started){
+            q.started = true;
+          }
+          if (!_isArray(data)) {
+              data = [data];
+          }
+          if(data.length == 0) {
+             // call drain immediately if there are no tasks
+             return async.setImmediate(function() {
+                 if (q.drain) {
+                     q.drain();
+                 }
+             });
+          }
+          _each(data, function(task) {
+              var item = {
+                  data: task,
+                  callback: typeof callback === 'function' ? callback : null
+              };
+
+              if (pos) {
+                q.tasks.unshift(item);
+              } else {
+                q.tasks.push(item);
+              }
+
+              if (q.saturated && q.tasks.length === q.concurrency) {
+                  q.saturated();
+              }
+              async.setImmediate(q.process);
+          });
+        }
+
+        var workers = 0;
+        var q = {
+            tasks: [],
+            concurrency: concurrency,
+            saturated: null,
+            empty: null,
+            drain: null,
+            started: false,
+            paused: false,
+            push: function (data, callback) {
+              _insert(q, data, false, callback);
+            },
+            kill: function () {
+              q.drain = null;
+              q.tasks = [];
+            },
+            unshift: function (data, callback) {
+              _insert(q, data, true, callback);
+            },
+            process: function () {
+                if (!q.paused && workers < q.concurrency && q.tasks.length) {
+                    var task = q.tasks.shift();
+                    if (q.empty && q.tasks.length === 0) {
+                        q.empty();
+                    }
+                    workers += 1;
+                    var next = function () {
+                        workers -= 1;
+                        if (task.callback) {
+                            task.callback.apply(task, arguments);
+                        }
+                        if (q.drain && q.tasks.length + workers === 0) {
+                            q.drain();
+                        }
+                        q.process();
+                    };
+                    var cb = only_once(next);
+                    worker(task.data, cb);
+                }
+            },
+            length: function () {
+                return q.tasks.length;
+            },
+            running: function () {
+                return workers;
+            },
+            idle: function() {
+                return q.tasks.length + workers === 0;
+            },
+            pause: function () {
+                if (q.paused === true) { return; }
+                q.paused = true;
+                q.process();
+            },
+            resume: function () {
+                if (q.paused === false) { return; }
+                q.paused = false;
+                q.process();
+            }
+        };
+        return q;
+    };
+    
+    async.priorityQueue = function (worker, concurrency) {
+        
+        function _compareTasks(a, b){
+          return a.priority - b.priority;
+        };
+        
+        function _binarySearch(sequence, item, compare) {
+          var beg = -1,
+              end = sequence.length - 1;
+          while (beg < end) {
+            var mid = beg + ((end - beg + 1) >>> 1);
+            if (compare(item, sequence[mid]) >= 0) {
+              beg = mid;
+            } else {
+              end = mid - 1;
+            }
+          }
+          return beg;
+        }
+        
+        function _insert(q, data, priority, callback) {
+          if (!q.started){
+            q.started = true;
+          }
+          if (!_isArray(data)) {
+              data = [data];
+          }
+          if(data.length == 0) {
+             // call drain immediately if there are no tasks
+             return async.setImmediate(function() {
+                 if (q.drain) {
+                     q.drain();
+                 }
+             });
+          }
+          _each(data, function(task) {
+              var item = {
+                  data: task,
+                  priority: priority,
+                  callback: typeof callback === 'function' ? callback : null
+              };
+              
+              q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
+
+              if (q.saturated && q.tasks.length === q.concurrency) {
+                  q.saturated();
+              }
+              async.setImmediate(q.process);
+          });
+        }
+        
+        // Start with a normal queue
+        var q = async.queue(worker, concurrency);
+        
+        // Override push to accept second parameter representing priority
+        q.push = function (data, priority, callback) {
+          _insert(q, data, priority, callback);
+        };
+        
+        // Remove unshift function
+        delete q.unshift;
+
+        return q;
+    };
+
+    async.cargo = function (worker, payload) {
+        var working     = false,
+            tasks       = [];
+
+        var cargo = {
+            tasks: tasks,
+            payload: payload,
+            saturated: null,
+            empty: null,
+            drain: null,
+            drained: true,
+            push: function (data, callback) {
+                if (!_isArray(data)) {
+                    data = [data];
+                }
+                _each(data, function(task) {
+                    tasks.push({
+                        data: task,
+                        callback: typeof callback === 'function' ? callback : null
+                    });
+                    cargo.drained = false;
+                    if (cargo.saturated && tasks.length === payload) {
+                        cargo.saturated();
+                    }
+                });
+                async.setImmediate(cargo.process);
+            },
+            process: function process() {
+                if (working) return;
+                if (tasks.length === 0) {
+                    if(cargo.drain && !cargo.drained) cargo.drain();
+                    cargo.drained = true;
+                    return;
+                }
+
+                var ts = typeof payload === 'number'
+                            ? tasks.splice(0, payload)
+                            : tasks.splice(0, tasks.length);
+
+                var ds = _map(ts, function (task) {
+                    return task.data;
+                });
+
+                if(cargo.empty) cargo.empty();
+                working = true;
+                worker(ds, function () {
+                    working = false;
+
+                    var args = arguments;
+                    _each(ts, function (data) {
+                        if (data.callback) {
+                            data.callback.apply(null, args);
+                        }
+                    });
+
+                    process();
+                });
+            },
+            length: function () {
+                return tasks.length;
+            },
+            running: function () {
+                return working;
+            }
+        };
+        return cargo;
+    };
+
+    var _console_fn = function (name) {
+        return function (fn) {
+            var args = Array.prototype.slice.call(arguments, 1);
+            fn.apply(null, args.concat([function (err) {
+                var args = Array.prototype.slice.call(arguments, 1);
+                if (typeof console !== 'undefined') {
+                    if (err) {
+                        if (console.error) {
+                            console.error(err);
+                        }
+                    }
+                    else if (console[name]) {
+                        _each(args, function (x) {
+                            console[name](x);
+                        });
+                    }
+                }
+            }]));
+        };
+    };
+    async.log = _console_fn('log');
+    async.dir = _console_fn('dir');
+    /*async.info = _console_fn('info');
+    async.warn = _console_fn('warn');
+    async.error = _console_fn('error');*/
+
+    async.memoize = function (fn, hasher) {
+        var memo = {};
+        var queues = {};
+        hasher = hasher || function (x) {
+            return x;
+        };
+        var memoized = function () {
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            var key = hasher.apply(null, args);
+            if (key in memo) {
+                async.nextTick(function () {
+                    callback.apply(null, memo[key]);
+                });
+            }
+            else if (key in queues) {
+                queues[key].push(callback);
+            }
+            else {
+                queues[key] = [callback];
+                fn.apply(null, args.concat([function () {
+                    memo[key] = arguments;
+                    var q = queues[key];
+                    delete queues[key];
+                    for (var i = 0, l = q.length; i < l; i++) {
+                      q[i].apply(null, arguments);
+                    }
+                }]));
+            }
+        };
+        memoized.memo = memo;
+        memoized.unmemoized = fn;
+        return memoized;
+    };
+
+    async.unmemoize = function (fn) {
+      return function () {
+        return (fn.unmemoized || fn).apply(null, arguments);
+      };
+    };
+
+    async.times = function (count, iterator, callback) {
+        var counter = [];
+        for (var i = 0; i < count; i++) {
+            counter.push(i);
+        }
+        return async.map(counter, iterator, callback);
+    };
+
+    async.timesSeries = function (count, iterator, callback) {
+        var counter = [];
+        for (var i = 0; i < count; i++) {
+            counter.push(i);
+        }
+        return async.mapSeries(counter, iterator, callback);
+    };
+
+    async.seq = function (/* functions... */) {
+        var fns = arguments;
+        return function () {
+            var that = this;
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            async.reduce(fns, args, function (newargs, fn, cb) {
+                fn.apply(that, newargs.concat([function () {
+                    var err = arguments[0];
+                    var nextargs = Array.prototype.slice.call(arguments, 1);
+                    cb(err, nextargs);
+                }]))
+            },
+            function (err, results) {
+                callback.apply(that, [err].concat(results));
+            });
+        };
+    };
+
+    async.compose = function (/* functions... */) {
+      return async.seq.apply(null, Array.prototype.reverse.call(arguments));
+    };
+
+    var _applyEach = function (eachfn, fns /*args...*/) {
+        var go = function () {
+            var that = this;
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            return eachfn(fns, function (fn, cb) {
+                fn.apply(that, args.concat([cb]));
+            },
+            callback);
+        };
+        if (arguments.length > 2) {
+            var args = Array.prototype.slice.call(arguments, 2);
+            return go.apply(this, args);
+        }
+        else {
+            return go;
+        }
+    };
+    async.applyEach = doParallel(_applyEach);
+    async.applyEachSeries = doSeries(_applyEach);
+
+    async.forever = function (fn, callback) {
+        function next(err) {
+            if (err) {
+                if (callback) {
+                    return callback(err);
+                }
+                throw err;
+            }
+            fn(next);
+        }
+        next();
+    };
+
+    // Node.js
+    if (typeof module !== 'undefined' && module.exports) {
+        module.exports = async;
+    }
+    // AMD / RequireJS
+    else if (typeof define !== 'undefined' && define.amd) {
+        define([], function () {
+            return async;
+        });
+    }
+    // included directly via <script> tag
+    else {
+        root.async = async;
+    }
+
+}());
diff --git a/packages/context-coloring/benchmark/fixtures/jquery-2.1.1.js b/packages/context-coloring/benchmark/fixtures/jquery-2.1.1.js
new file mode 100644
index 0000000..9f7b3d3
--- /dev/null
+++ b/packages/context-coloring/benchmark/fixtures/jquery-2.1.1.js
@@ -0,0 +1,9190 @@
+/*!
+ * jQuery JavaScript Library v2.1.1
+ * http://jquery.com/
+ *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ *
+ * Copyright 2005, 2014 jQuery Foundation, Inc. and other contributors
+ * Released under the MIT license
+ * http://jquery.org/license
+ *
+ * Date: 2014-05-01T17:11Z
+ */
+
+(function( global, factory ) {
+
+	if ( typeof module === "object" && typeof module.exports === "object" ) {
+		// For CommonJS and CommonJS-like environments where a proper window is present,
+		// execute the factory and get jQuery
+		// For environments that do not inherently posses a window with a document
+		// (such as Node.js), expose a jQuery-making factory as module.exports
+		// This accentuates the need for the creation of a real window
+		// e.g. var jQuery = require("jquery")(window);
+		// See ticket #14549 for more info
+		module.exports = global.document ?
+			factory( global, true ) :
+			function( w ) {
+				if ( !w.document ) {
+					throw new Error( "jQuery requires a window with a document" );
+				}
+				return factory( w );
+			};
+	} else {
+		factory( global );
+	}
+
+// Pass this if window is not defined yet
+}(typeof window !== "undefined" ? window : this, function( window, noGlobal ) {
+
+// Can't do this because several apps including ASP.NET trace
+// the stack via arguments.caller.callee and Firefox dies if
+// you try to trace through "use strict" call chains. (#13335)
+// Support: Firefox 18+
+//
+
+var arr = [];
+
+var slice = arr.slice;
+
+var concat = arr.concat;
+
+var push = arr.push;
+
+var indexOf = arr.indexOf;
+
+var class2type = {};
+
+var toString = class2type.toString;
+
+var hasOwn = class2type.hasOwnProperty;
+
+var support = {};
+
+
+
+var
+	// Use the correct document accordingly with window argument (sandbox)
+	document = window.document,
+
+	version = "2.1.1",
+
+	// Define a local copy of jQuery
+	jQuery = function( selector, context ) {
+		// The jQuery object is actually just the init constructor 'enhanced'
+		// Need init if jQuery is called (just allow error to be thrown if not included)
+		return new jQuery.fn.init( selector, context );
+	},
+
+	// Support: Android<4.1
+	// Make sure we trim BOM and NBSP
+	rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,
+
+	// Matches dashed string for camelizing
+	rmsPrefix = /^-ms-/,
+	rdashAlpha = /-([\da-z])/gi,
+
+	// Used by jQuery.camelCase as callback to replace()
+	fcamelCase = function( all, letter ) {
+		return letter.toUpperCase();
+	};
+
+jQuery.fn = jQuery.prototype = {
+	// The current version of jQuery being used
+	jquery: version,
+
+	constructor: jQuery,
+
+	// Start with an empty selector
+	selector: "",
+
+	// The default length of a jQuery object is 0
+	length: 0,
+
+	toArray: function() {
+		return slice.call( this );
+	},
+
+	// Get the Nth element in the matched element set OR
+	// Get the whole matched element set as a clean array
+	get: function( num ) {
+		return num != null ?
+
+			// Return just the one element from the set
+			( num < 0 ? this[ num + this.length ] : this[ num ] ) :
+
+			// Return all the elements in a clean array
+			slice.call( this );
+	},
+
+	// Take an array of elements and push it onto the stack
+	// (returning the new matched element set)
+	pushStack: function( elems ) {
+
+		// Build a new jQuery matched element set
+		var ret = jQuery.merge( this.constructor(), elems );
+
+		// Add the old object onto the stack (as a reference)
+		ret.prevObject = this;
+		ret.context = this.context;
+
+		// Return the newly-formed element set
+		return ret;
+	},
+
+	// Execute a callback for every element in the matched set.
+	// (You can seed the arguments with an array of args, but this is
+	// only used internally.)
+	each: function( callback, args ) {
+		return jQuery.each( this, callback, args );
+	},
+
+	map: function( callback ) {
+		return this.pushStack( jQuery.map(this, function( elem, i ) {
+			return callback.call( elem, i, elem );
+		}));
+	},
+
+	slice: function() {
+		return this.pushStack( slice.apply( this, arguments ) );
+	},
+
+	first: function() {
+		return this.eq( 0 );
+	},
+
+	last: function() {
+		return this.eq( -1 );
+	},
+
+	eq: function( i ) {
+		var len = this.length,
+			j = +i + ( i < 0 ? len : 0 );
+		return this.pushStack( j >= 0 && j < len ? [ this[j] ] : [] );
+	},
+
+	end: function() {
+		return this.prevObject || this.constructor(null);
+	},
+
+	// For internal use only.
+	// Behaves like an Array's method, not like a jQuery method.
+	push: push,
+	sort: arr.sort,
+	splice: arr.splice
+};
+
+jQuery.extend = jQuery.fn.extend = function() {
+	var options, name, src, copy, copyIsArray, clone,
+		target = arguments[0] || {},
+		i = 1,
+		length = arguments.length,
+		deep = false;
+
+	// Handle a deep copy situation
+	if ( typeof target === "boolean" ) {
+		deep = target;
+
+		// skip the boolean and the target
+		target = arguments[ i ] || {};
+		i++;
+	}
+
+	// Handle case when target is a string or something (possible in deep copy)
+	if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
+		target = {};
+	}
+
+	// extend jQuery itself if only one argument is passed
+	if ( i === length ) {
+		target = this;
+		i--;
+	}
+
+	for ( ; i < length; i++ ) {
+		// Only deal with non-null/undefined values
+		if ( (options = arguments[ i ]) != null ) {
+			// Extend the base object
+			for ( name in options ) {
+				src = target[ name ];
+				copy = options[ name ];
+
+				// Prevent never-ending loop
+				if ( target === copy ) {
+					continue;
+				}
+
+				// Recurse if we're merging plain objects or arrays
+				if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
+					if ( copyIsArray ) {
+						copyIsArray = false;
+						clone = src && jQuery.isArray(src) ? src : [];
+
+					} else {
+						clone = src && jQuery.isPlainObject(src) ? src : {};
+					}
+
+					// Never move original objects, clone them
+					target[ name ] = jQuery.extend( deep, clone, copy );
+
+				// Don't bring in undefined values
+				} else if ( copy !== undefined ) {
+					target[ name ] = copy;
+				}
+			}
+		}
+	}
+
+	// Return the modified object
+	return target;
+};
+
+jQuery.extend({
+	// Unique for each copy of jQuery on the page
+	expando: "jQuery" + ( version + Math.random() ).replace( /\D/g, "" ),
+
+	// Assume jQuery is ready without the ready module
+	isReady: true,
+
+	error: function( msg ) {
+		throw new Error( msg );
+	},
+
+	noop: function() {},
+
+	// See test/unit/core.js for details concerning isFunction.
+	// Since version 1.3, DOM methods and functions like alert
+	// aren't supported. They return false on IE (#2968).
+	isFunction: function( obj ) {
+		return jQuery.type(obj) === "function";
+	},
+
+	isArray: Array.isArray,
+
+	isWindow: function( obj ) {
+		return obj != null && obj === obj.window;
+	},
+
+	isNumeric: function( obj ) {
+		// parseFloat NaNs numeric-cast false positives (null|true|false|"")
+		// ...but misinterprets leading-number strings, particularly hex literals ("0x...")
+		// subtraction forces infinities to NaN
+		return !jQuery.isArray( obj ) && obj - parseFloat( obj ) >= 0;
+	},
+
+	isPlainObject: function( obj ) {
+		// Not plain objects:
+		// - Any object or value whose internal [[Class]] property is not "[object Object]"
+		// - DOM nodes
+		// - window
+		if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
+			return false;
+		}
+
+		if ( obj.constructor &&
+				!hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
+			return false;
+		}
+
+		// If the function hasn't returned already, we're confident that
+		// |obj| is a plain object, created by {} or constructed with new Object
+		return true;
+	},
+
+	isEmptyObject: function( obj ) {
+		var name;
+		for ( name in obj ) {
+			return false;
+		}
+		return true;
+	},
+
+	type: function( obj ) {
+		if ( obj == null ) {
+			return obj + "";
+		}
+		// Support: Android < 4.0, iOS < 6 (functionish RegExp)
+		return typeof obj === "object" || typeof obj === "function" ?
+			class2type[ toString.call(obj) ] || "object" :
+			typeof obj;
+	},
+
+	// Evaluates a script in a global context
+	globalEval: function( code ) {
+		var script,
+			indirect = eval;
+
+		code = jQuery.trim( code );
+
+		if ( code ) {
+			// If the code includes a valid, prologue position
+			// strict mode pragma, execute code by injecting a
+			// script tag into the document.
+			if ( code.indexOf("use strict") === 1 ) {
+				script = document.createElement("script");
+				script.text = code;
+				document.head.appendChild( script ).parentNode.removeChild( script );
+			} else {
+			// Otherwise, avoid the DOM node creation, insertion
+			// and removal by using an indirect global eval
+				indirect( code );
+			}
+		}
+	},
+
+	// Convert dashed to camelCase; used by the css and data modules
+	// Microsoft forgot to hump their vendor prefix (#9572)
+	camelCase: function( string ) {
+		return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );
+	},
+
+	nodeName: function( elem, name ) {
+		return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase();
+	},
+
+	// args is for internal usage only
+	each: function( obj, callback, args ) {
+		var value,
+			i = 0,
+			length = obj.length,
+			isArray = isArraylike( obj );
+
+		if ( args ) {
+			if ( isArray ) {
+				for ( ; i < length; i++ ) {
+					value = callback.apply( obj[ i ], args );
+
+					if ( value === false ) {
+						break;
+					}
+				}
+			} else {
+				for ( i in obj ) {
+					value = callback.apply( obj[ i ], args );
+
+					if ( value === false ) {
+						break;
+					}
+				}
+			}
+
+		// A special, fast, case for the most common use of each
+		} else {
+			if ( isArray ) {
+				for ( ; i < length; i++ ) {
+					value = callback.call( obj[ i ], i, obj[ i ] );
+
+					if ( value === false ) {
+						break;
+					}
+				}
+			} else {
+				for ( i in obj ) {
+					value = callback.call( obj[ i ], i, obj[ i ] );
+
+					if ( value === false ) {
+						break;
+					}
+				}
+			}
+		}
+
+		return obj;
+	},
+
+	// Support: Android<4.1
+	trim: function( text ) {
+		return text == null ?
+			"" :
+			( text + "" ).replace( rtrim, "" );
+	},
+
+	// results is for internal usage only
+	makeArray: function( arr, results ) {
+		var ret = results || [];
+
+		if ( arr != null ) {
+			if ( isArraylike( Object(arr) ) ) {
+				jQuery.merge( ret,
+					typeof arr === "string" ?
+					[ arr ] : arr
+				);
+			} else {
+				push.call( ret, arr );
+			}
+		}
+
+		return ret;
+	},
+
+	inArray: function( elem, arr, i ) {
+		return arr == null ? -1 : indexOf.call( arr, elem, i );
+	},
+
+	merge: function( first, second ) {
+		var len = +second.length,
+			j = 0,
+			i = first.length;
+
+		for ( ; j < len; j++ ) {
+			first[ i++ ] = second[ j ];
+		}
+
+		first.length = i;
+
+		return first;
+	},
+
+	grep: function( elems, callback, invert ) {
+		var callbackInverse,
+			matches = [],
+			i = 0,
+			length = elems.length,
+			callbackExpect = !invert;
+
+		// Go through the array, only saving the items
+		// that pass the validator function
+		for ( ; i < length; i++ ) {
+			callbackInverse = !callback( elems[ i ], i );
+			if ( callbackInverse !== callbackExpect ) {
+				matches.push( elems[ i ] );
+			}
+		}
+
+		return matches;
+	},
+
+	// arg is for internal usage only
+	map: function( elems, callback, arg ) {
+		var value,
+			i = 0,
+			length = elems.length,
+			isArray = isArraylike( elems ),
+			ret = [];
+
+		// Go through the array, translating each of the items to their new values
+		if ( isArray ) {
+			for ( ; i < length; i++ ) {
+				value = callback( elems[ i ], i, arg );
+
+				if ( value != null ) {
+					ret.push( value );
+				}
+			}
+
+		// Go through every key on the object,
+		} else {
+			for ( i in elems ) {
+				value = callback( elems[ i ], i, arg );
+
+				if ( value != null ) {
+					ret.push( value );
+				}
+			}
+		}
+
+		// Flatten any nested arrays
+		return concat.apply( [], ret );
+	},
+
+	// A global GUID counter for objects
+	guid: 1,
+
+	// Bind a function to a context, optionally partially applying any
+	// arguments.
+	proxy: function( fn, context ) {
+		var tmp, args, proxy;
+
+		if ( typeof context === "string" ) {
+			tmp = fn[ context ];
+			context = fn;
+			fn = tmp;
+		}
+
+		// Quick check to determine if target is callable, in the spec
+		// this throws a TypeError, but we will just return undefined.
+		if ( !jQuery.isFunction( fn ) ) {
+			return undefined;
+		}
+
+		// Simulated bind
+		args = slice.call( arguments, 2 );
+		proxy = function() {
+			return fn.apply( context || this, args.concat( slice.call( arguments ) ) );
+		};
+
+		// Set the guid of unique handler to the same of original handler, so it can be removed
+		proxy.guid = fn.guid = fn.guid || jQuery.guid++;
+
+		return proxy;
+	},
+
+	now: Date.now,
+
+	// jQuery.support is not used in Core but other projects attach their
+	// properties to it so it needs to exist.
+	support: support
+});
+
+// Populate the class2type map
+jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
+	class2type[ "[object " + name + "]" ] = name.toLowerCase();
+});
+
+function isArraylike( obj ) {
+	var length = obj.length,
+		type = jQuery.type( obj );
+
+	if ( type === "function" || jQuery.isWindow( obj ) ) {
+		return false;
+	}
+
+	if ( obj.nodeType === 1 && length ) {
+		return true;
+	}
+
+	return type === "array" || length === 0 ||
+		typeof length === "number" && length > 0 && ( length - 1 ) in obj;
+}
+var Sizzle =
+/*!
+ * Sizzle CSS Selector Engine v1.10.19
+ * http://sizzlejs.com/
+ *
+ * Copyright 2013 jQuery Foundation, Inc. and other contributors
+ * Released under the MIT license
+ * http://jquery.org/license
+ *
+ * Date: 2014-04-18
+ */
+(function( window ) {
+
+var i,
+	support,
+	Expr,
+	getText,
+	isXML,
+	tokenize,
+	compile,
+	select,
+	outermostContext,
+	sortInput,
+	hasDuplicate,
+
+	// Local document vars
+	setDocument,
+	document,
+	docElem,
+	documentIsHTML,
+	rbuggyQSA,
+	rbuggyMatches,
+	matches,
+	contains,
+
+	// Instance-specific data
+	expando = "sizzle" + -(new Date()),
+	preferredDoc = window.document,
+	dirruns = 0,
+	done = 0,
+	classCache = createCache(),
+	tokenCache = createCache(),
+	compilerCache = createCache(),
+	sortOrder = function( a, b ) {
+		if ( a === b ) {
+			hasDuplicate = true;
+		}
+		return 0;
+	},
+
+	// General-purpose constants
+	strundefined = typeof undefined,
+	MAX_NEGATIVE = 1 << 31,
+
+	// Instance methods
+	hasOwn = ({}).hasOwnProperty,
+	arr = [],
+	pop = arr.pop,
+	push_native = arr.push,
+	push = arr.push,
+	slice = arr.slice,
+	// Use a stripped-down indexOf if we can't use a native one
+	indexOf = arr.indexOf || function( elem ) {
+		var i = 0,
+			len = this.length;
+		for ( ; i < len; i++ ) {
+			if ( this[i] === elem ) {
+				return i;
+			}
+		}
+		return -1;
+	},
+
+	booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",
+
+	// Regular expressions
+
+	// Whitespace characters http://www.w3.org/TR/css3-selectors/#whitespace
+	whitespace = "[\\x20\\t\\r\\n\\f]",
+	// http://www.w3.org/TR/css3-syntax/#characters
+	characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",
+
+	// Loosely modeled on CSS identifier characters
+	// An unquoted value should be a CSS identifier http://www.w3.org/TR/css3-selectors/#attribute-selectors
+	// Proper syntax: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
+	identifier = characterEncoding.replace( "w", "w#" ),
+
+	// Attribute selectors: http://www.w3.org/TR/selectors/#attribute-selectors
+	attributes = "\\[" + whitespace + "*(" + characterEncoding + ")(?:" + whitespace +
+		// Operator (capture 2)
+		"*([*^$|!~]?=)" + whitespace +
+		// "Attribute values must be CSS identifiers [capture 5] or strings [capture 3 or capture 4]"
+		"*(?:'((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\"|(" + identifier + "))|)" + whitespace +
+		"*\\]",
+
+	pseudos = ":(" + characterEncoding + ")(?:\\((" +
+		// To reduce the number of selectors needing tokenize in the preFilter, prefer arguments:
+		// 1. quoted (capture 3; capture 4 or capture 5)
+		"('((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\")|" +
+		// 2. simple (capture 6)
+		"((?:\\\\.|[^\\\\()[\\]]|" + attributes + ")*)|" +
+		// 3. anything else (capture 2)
+		".*" +
+		")\\)|)",
+
+	// Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter
+	rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),
+
+	rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
+	rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),
+
+	rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ),
+
+	rpseudo = new RegExp( pseudos ),
+	ridentifier = new RegExp( "^" + identifier + "$" ),
+
+	matchExpr = {
+		"ID": new RegExp( "^#(" + characterEncoding + ")" ),
+		"CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
+		"TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
+		"ATTR": new RegExp( "^" + attributes ),
+		"PSEUDO": new RegExp( "^" + pseudos ),
+		"CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
+			"*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
+			"*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
+		"bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
+		// For use in libraries implementing .is()
+		// We use this for POS matching in `select`
+		"needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
+			whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
+	},
+
+	rinputs = /^(?:input|select|textarea|button)$/i,
+	rheader = /^h\d$/i,
+
+	rnative = /^[^{]+\{\s*\[native \w/,
+
+	// Easily-parseable/retrievable ID or TAG or CLASS selectors
+	rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,
+
+	rsibling = /[+~]/,
+	rescape = /'|\\/g,
+
+	// CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters
+	runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
+	funescape = function( _, escaped, escapedWhitespace ) {
+		var high = "0x" + escaped - 0x10000;
+		// NaN means non-codepoint
+		// Support: Firefox<24
+		// Workaround erroneous numeric interpretation of +"0x"
+		return high !== high || escapedWhitespace ?
+			escaped :
+			high < 0 ?
+				// BMP codepoint
+				String.fromCharCode( high + 0x10000 ) :
+				// Supplemental Plane codepoint (surrogate pair)
+				String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
+	};
+
+// Optimize for push.apply( _, NodeList )
+try {
+	push.apply(
+		(arr = slice.call( preferredDoc.childNodes )),
+		preferredDoc.childNodes
+	);
+	// Support: Android<4.0
+	// Detect silently failing push.apply
+	arr[ preferredDoc.childNodes.length ].nodeType;
+} catch ( e ) {
+	push = { apply: arr.length ?
+
+		// Leverage slice if possible
+		function( target, els ) {
+			push_native.apply( target, slice.call(els) );
+		} :
+
+		// Support: IE<9
+		// Otherwise append directly
+		function( target, els ) {
+			var j = target.length,
+				i = 0;
+			// Can't trust NodeList.length
+			while ( (target[j++] = els[i++]) ) {}
+			target.length = j - 1;
+		}
+	};
+}
+
+function Sizzle( selector, context, results, seed ) {
+	var match, elem, m, nodeType,
+		// QSA vars
+		i, groups, old, nid, newContext, newSelector;
+
+	if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
+		setDocument( context );
+	}
+
+	context = context || document;
+	results = results || [];
+
+	if ( !selector || typeof selector !== "string" ) {
+		return results;
+	}
+
+	if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
+		return [];
+	}
+
+	if ( documentIsHTML && !seed ) {
+
+		// Shortcuts
+		if ( (match = rquickExpr.exec( selector )) ) {
+			// Speed-up: Sizzle("#ID")
+			if ( (m = match[1]) ) {
+				if ( nodeType === 9 ) {
+					elem = context.getElementById( m );
+					// Check parentNode to catch when Blackberry 4.6 returns
+					// nodes that are no longer in the document (jQuery #6963)
+					if ( elem && elem.parentNode ) {
+						// Handle the case where IE, Opera, and Webkit return items
+						// by name instead of ID
+						if ( elem.id === m ) {
+							results.push( elem );
+							return results;
+						}
+					} else {
+						return results;
+					}
+				} else {
+					// Context is not a document
+					if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
+						contains( context, elem ) && elem.id === m ) {
+						results.push( elem );
+						return results;
+					}
+				}
+
+			// Speed-up: Sizzle("TAG")
+			} else if ( match[2] ) {
+				push.apply( results, context.getElementsByTagName( selector ) );
+				return results;
+
+			// Speed-up: Sizzle(".CLASS")
+			} else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
+				push.apply( results, context.getElementsByClassName( m ) );
+				return results;
+			}
+		}
+
+		// QSA path
+		if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
+			nid = old = expando;
+			newContext = context;
+			newSelector = nodeType === 9 && selector;
+
+			// qSA works strangely on Element-rooted queries
+			// We can work around this by specifying an extra ID on the root
+			// and working up from there (Thanks to Andrew Dupont for the technique)
+			// IE 8 doesn't work on object elements
+			if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
+				groups = tokenize( selector );
+
+				if ( (old = context.getAttribute("id")) ) {
+					nid = old.replace( rescape, "\\$&" );
+				} else {
+					context.setAttribute( "id", nid );
+				}
+				nid = "[id='" + nid + "'] ";
+
+				i = groups.length;
+				while ( i-- ) {
+					groups[i] = nid + toSelector( groups[i] );
+				}
+				newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
+				newSelector = groups.join(",");
+			}
+
+			if ( newSelector ) {
+				try {
+					push.apply( results,
+						newContext.querySelectorAll( newSelector )
+					);
+					return results;
+				} catch(qsaError) {
+				} finally {
+					if ( !old ) {
+						context.removeAttribute("id");
+					}
+				}
+			}
+		}
+	}
+
+	// All others
+	return select( selector.replace( rtrim, "$1" ), context, results, seed );
+}
+
+/**
+ * Create key-value caches of limited size
+ * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
+ *	property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
+ *	deleting the oldest entry
+ */
+function createCache() {
+	var keys = [];
+
+	function cache( key, value ) {
+		// Use (key + " ") to avoid collision with native prototype properties (see Issue #157)
+		if ( keys.push( key + " " ) > Expr.cacheLength ) {
+			// Only keep the most recent entries
+			delete cache[ keys.shift() ];
+		}
+		return (cache[ key + " " ] = value);
+	}
+	return cache;
+}
+
+/**
+ * Mark a function for special use by Sizzle
+ * @param {Function} fn The function to mark
+ */
+function markFunction( fn ) {
+	fn[ expando ] = true;
+	return fn;
+}
+
+/**
+ * Support testing using an element
+ * @param {Function} fn Passed the created div and expects a boolean result
+ */
+function assert( fn ) {
+	var div = document.createElement("div");
+
+	try {
+		return !!fn( div );
+	} catch (e) {
+		return false;
+	} finally {
+		// Remove from its parent by default
+		if ( div.parentNode ) {
+			div.parentNode.removeChild( div );
+		}
+		// release memory in IE
+		div = null;
+	}
+}
+
+/**
+ * Adds the same handler for all of the specified attrs
+ * @param {String} attrs Pipe-separated list of attributes
+ * @param {Function} handler The method that will be applied
+ */
+function addHandle( attrs, handler ) {
+	var arr = attrs.split("|"),
+		i = attrs.length;
+
+	while ( i-- ) {
+		Expr.attrHandle[ arr[i] ] = handler;
+	}
+}
+
+/**
+ * Checks document order of two siblings
+ * @param {Element} a
+ * @param {Element} b
+ * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
+ */
+function siblingCheck( a, b ) {
+	var cur = b && a,
+		diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
+			( ~b.sourceIndex || MAX_NEGATIVE ) -
+			( ~a.sourceIndex || MAX_NEGATIVE );
+
+	// Use IE sourceIndex if available on both nodes
+	if ( diff ) {
+		return diff;
+	}
+
+	// Check if b follows a
+	if ( cur ) {
+		while ( (cur = cur.nextSibling) ) {
+			if ( cur === b ) {
+				return -1;
+			}
+		}
+	}
+
+	return a ? 1 : -1;
+}
+
+/**
+ * Returns a function to use in pseudos for input types
+ * @param {String} type
+ */
+function createInputPseudo( type ) {
+	return function( elem ) {
+		var name = elem.nodeName.toLowerCase();
+		return name === "input" && elem.type === type;
+	};
+}
+
+/**
+ * Returns a function to use in pseudos for buttons
+ * @param {String} type
+ */
+function createButtonPseudo( type ) {
+	return function( elem ) {
+		var name = elem.nodeName.toLowerCase();
+		return (name === "input" || name === "button") && elem.type === type;
+	};
+}
+
+/**
+ * Returns a function to use in pseudos for positionals
+ * @param {Function} fn
+ */
+function createPositionalPseudo( fn ) {
+	return markFunction(function( argument ) {
+		argument = +argument;
+		return markFunction(function( seed, matches ) {
+			var j,
+				matchIndexes = fn( [], seed.length, argument ),
+				i = matchIndexes.length;
+
+			// Match elements found at the specified indexes
+			while ( i-- ) {
+				if ( seed[ (j = matchIndexes[i]) ] ) {
+					seed[j] = !(matches[j] = seed[j]);
+				}
+			}
+		});
+	});
+}
+
+/**
+ * Checks a node for validity as a Sizzle context
+ * @param {Element|Object=} context
+ * @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
+ */
+function testContext( context ) {
+	return context && typeof context.getElementsByTagName !== strundefined && context;
+}
+
+// Expose support vars for convenience
+support = Sizzle.support = {};
+
+/**
+ * Detects XML nodes
+ * @param {Element|Object} elem An element or a document
+ * @returns {Boolean} True iff elem is a non-HTML XML node
+ */
+isXML = Sizzle.isXML = function( elem ) {
+	// documentElement is verified for cases where it doesn't yet exist
+	// (such as loading iframes in IE - #4833)
+	var documentElement = elem && (elem.ownerDocument || elem).documentElement;
+	return documentElement ? documentElement.nodeName !== "HTML" : false;
+};
+
+/**
+ * Sets document-related variables once based on the current document
+ * @param {Element|Object} [doc] An element or document object to use to set the document
+ * @returns {Object} Returns the current document
+ */
+setDocument = Sizzle.setDocument = function( node ) {
+	var hasCompare,
+		doc = node ? node.ownerDocument || node : preferredDoc,
+		parent = doc.defaultView;
+
+	// If no document and documentElement is available, return
+	if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
+		return document;
+	}
+
+	// Set our document
+	document = doc;
+	docElem = doc.documentElement;
+
+	// Support tests
+	documentIsHTML = !isXML( doc );
+
+	// Support: IE>8
+	// If iframe document is assigned to "document" variable and if iframe has been reloaded,
+	// IE will throw "permission denied" error when accessing "document" variable, see jQuery #13936
+	// IE6-8 do not support the defaultView property so parent will be undefined
+	if ( parent && parent !== parent.top ) {
+		// IE11 does not have attachEvent, so all must suffer
+		if ( parent.addEventListener ) {
+			parent.addEventListener( "unload", function() {
+				setDocument();
+			}, false );
+		} else if ( parent.attachEvent ) {
+			parent.attachEvent( "onunload", function() {
+				setDocument();
+			});
+		}
+	}
+
+	/* Attributes
+	---------------------------------------------------------------------- */
+
+	// Support: IE<8
+	// Verify that getAttribute really returns attributes and not properties (excepting IE8 booleans)
+	support.attributes = assert(function( div ) {
+		div.className = "i";
+		return !div.getAttribute("className");
+	});
+
+	/* getElement(s)By*
+	---------------------------------------------------------------------- */
+
+	// Check if getElementsByTagName("*") returns only elements
+	support.getElementsByTagName = assert(function( div ) {
+		div.appendChild( doc.createComment("") );
+		return !div.getElementsByTagName("*").length;
+	});
+
+	// Check if getElementsByClassName can be trusted
+	support.getElementsByClassName = rnative.test( doc.getElementsByClassName ) && assert(function( div ) {
+		div.innerHTML = "<div class='a'></div><div class='a i'></div>";
+
+		// Support: Safari<4
+		// Catch class over-caching
+		div.firstChild.className = "i";
+		// Support: Opera<10
+		// Catch gEBCN failure to find non-leading classes
+		return div.getElementsByClassName("i").length === 2;
+	});
+
+	// Support: IE<10
+	// Check if getElementById returns elements by name
+	// The broken getElementById methods don't pick up programatically-set names,
+	// so use a roundabout getElementsByName test
+	support.getById = assert(function( div ) {
+		docElem.appendChild( div ).id = expando;
+		return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
+	});
+
+	// ID find and filter
+	if ( support.getById ) {
+		Expr.find["ID"] = function( id, context ) {
+			if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
+				var m = context.getElementById( id );
+				// Check parentNode to catch when Blackberry 4.6 returns
+				// nodes that are no longer in the document #6963
+				return m && m.parentNode ? [ m ] : [];
+			}
+		};
+		Expr.filter["ID"] = function( id ) {
+			var attrId = id.replace( runescape, funescape );
+			return function( elem ) {
+				return elem.getAttribute("id") === attrId;
+			};
+		};
+	} else {
+		// Support: IE6/7
+		// getElementById is not reliable as a find shortcut
+		delete Expr.find["ID"];
+
+		Expr.filter["ID"] =  function( id ) {
+			var attrId = id.replace( runescape, funescape );
+			return function( elem ) {
+				var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
+				return node && node.value === attrId;
+			};
+		};
+	}
+
+	// Tag
+	Expr.find["TAG"] = support.getElementsByTagName ?
+		function( tag, context ) {
+			if ( typeof context.getElementsByTagName !== strundefined ) {
+				return context.getElementsByTagName( tag );
+			}
+		} :
+		function( tag, context ) {
+			var elem,
+				tmp = [],
+				i = 0,
+				results = context.getElementsByTagName( tag );
+
+			// Filter out possible comments
+			if ( tag === "*" ) {
+				while ( (elem = results[i++]) ) {
+					if ( elem.nodeType === 1 ) {
+						tmp.push( elem );
+					}
+				}
+
+				return tmp;
+			}
+			return results;
+		};
+
+	// Class
+	Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
+		if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
+			return context.getElementsByClassName( className );
+		}
+	};
+
+	/* QSA/matchesSelector
+	---------------------------------------------------------------------- */
+
+	// QSA and matchesSelector support
+
+	// matchesSelector(:active) reports false when true (IE9/Opera 11.5)
+	rbuggyMatches = [];
+
+	// qSa(:focus) reports false when true (Chrome 21)
+	// We allow this because of a bug in IE8/9 that throws an error
+	// whenever `document.activeElement` is accessed on an iframe
+	// So, we allow :focus to pass through QSA all the time to avoid the IE error
+	// See http://bugs.jquery.com/ticket/13378
+	rbuggyQSA = [];
+
+	if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
+		// Build QSA regex
+		// Regex strategy adopted from Diego Perini
+		assert(function( div ) {
+			// Select is set to empty string on purpose
+			// This is to test IE's treatment of not explicitly
+			// setting a boolean content attribute,
+			// since its presence should be enough
+			// http://bugs.jquery.com/ticket/12359
+			div.innerHTML = "<select msallowclip=''><option selected=''></option></select>";
+
+			// Support: IE8, Opera 11-12.16
+			// Nothing should be selected when empty strings follow ^= or $= or *=
+			// The test attribute must be unknown in Opera but "safe" for WinRT
+			// http://msdn.microsoft.com/en-us/library/ie/hh465388.aspx#attribute_section
+			if ( div.querySelectorAll("[msallowclip^='']").length ) {
+				rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
+			}
+
+			// Support: IE8
+			// Boolean attributes and "value" are not treated correctly
+			if ( !div.querySelectorAll("[selected]").length ) {
+				rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
+			}
+
+			// Webkit/Opera - :checked should return selected option elements
+			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
+			// IE8 throws error here and will not see later tests
+			if ( !div.querySelectorAll(":checked").length ) {
+				rbuggyQSA.push(":checked");
+			}
+		});
+
+		assert(function( div ) {
+			// Support: Windows 8 Native Apps
+			// The type and name attributes are restricted during .innerHTML assignment
+			var input = doc.createElement("input");
+			input.setAttribute( "type", "hidden" );
+			div.appendChild( input ).setAttribute( "name", "D" );
+
+			// Support: IE8
+			// Enforce case-sensitivity of name attribute
+			if ( div.querySelectorAll("[name=d]").length ) {
+				rbuggyQSA.push( "name" + whitespace + "*[*^$|!~]?=" );
+			}
+
+			// FF 3.5 - :enabled/:disabled and hidden elements (hidden elements are still enabled)
+			// IE8 throws error here and will not see later tests
+			if ( !div.querySelectorAll(":enabled").length ) {
+				rbuggyQSA.push( ":enabled", ":disabled" );
+			}
+
+			// Opera 10-11 does not throw on post-comma invalid pseudos
+			div.querySelectorAll("*,:x");
+			rbuggyQSA.push(",.*:");
+		});
+	}
+
+	if ( (support.matchesSelector = rnative.test( (matches = docElem.matches ||
+		docElem.webkitMatchesSelector ||
+		docElem.mozMatchesSelector ||
+		docElem.oMatchesSelector ||
+		docElem.msMatchesSelector) )) ) {
+
+		assert(function( div ) {
+			// Check to see if it's possible to do matchesSelector
+			// on a disconnected node (IE 9)
+			support.disconnectedMatch = matches.call( div, "div" );
+
+			// This should fail with an exception
+			// Gecko does not error, returns false instead
+			matches.call( div, "[s!='']:x" );
+			rbuggyMatches.push( "!=", pseudos );
+		});
+	}
+
+	rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
+	rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );
+
+	/* Contains
+	---------------------------------------------------------------------- */
+	hasCompare = rnative.test( docElem.compareDocumentPosition );
+
+	// Element contains another
+	// Purposefully does not implement inclusive descendent
+	// As in, an element does not contain itself
+	contains = hasCompare || rnative.test( docElem.contains ) ?
+		function( a, b ) {
+			var adown = a.nodeType === 9 ? a.documentElement : a,
+				bup = b && b.parentNode;
+			return a === bup || !!( bup && bup.nodeType === 1 && (
+				adown.contains ?
+					adown.contains( bup ) :
+					a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
+			));
+		} :
+		function( a, b ) {
+			if ( b ) {
+				while ( (b = b.parentNode) ) {
+					if ( b === a ) {
+						return true;
+					}
+				}
+			}
+			return false;
+		};
+
+	/* Sorting
+	---------------------------------------------------------------------- */
+
+	// Document order sorting
+	sortOrder = hasCompare ?
+	function( a, b ) {
+
+		// Flag for duplicate removal
+		if ( a === b ) {
+			hasDuplicate = true;
+			return 0;
+		}
+
+		// Sort on method existence if only one input has compareDocumentPosition
+		var compare = !a.compareDocumentPosition - !b.compareDocumentPosition;
+		if ( compare ) {
+			return compare;
+		}
+
+		// Calculate position if both inputs belong to the same document
+		compare = ( a.ownerDocument || a ) === ( b.ownerDocument || b ) ?
+			a.compareDocumentPosition( b ) :
+
+			// Otherwise we know they are disconnected
+			1;
+
+		// Disconnected nodes
+		if ( compare & 1 ||
+			(!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {
+
+			// Choose the first element that is related to our preferred document
+			if ( a === doc || a.ownerDocument === preferredDoc && contains(preferredDoc, a) ) {
+				return -1;
+			}
+			if ( b === doc || b.ownerDocument === preferredDoc && contains(preferredDoc, b) ) {
+				return 1;
+			}
+
+			// Maintain original order
+			return sortInput ?
+				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
+				0;
+		}
+
+		return compare & 4 ? -1 : 1;
+	} :
+	function( a, b ) {
+		// Exit early if the nodes are identical
+		if ( a === b ) {
+			hasDuplicate = true;
+			return 0;
+		}
+
+		var cur,
+			i = 0,
+			aup = a.parentNode,
+			bup = b.parentNode,
+			ap = [ a ],
+			bp = [ b ];
+
+		// Parentless nodes are either documents or disconnected
+		if ( !aup || !bup ) {
+			return a === doc ? -1 :
+				b === doc ? 1 :
+				aup ? -1 :
+				bup ? 1 :
+				sortInput ?
+				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
+				0;
+
+		// If the nodes are siblings, we can do a quick check
+		} else if ( aup === bup ) {
+			return siblingCheck( a, b );
+		}
+
+		// Otherwise we need full lists of their ancestors for comparison
+		cur = a;
+		while ( (cur = cur.parentNode) ) {
+			ap.unshift( cur );
+		}
+		cur = b;
+		while ( (cur = cur.parentNode) ) {
+			bp.unshift( cur );
+		}
+
+		// Walk down the tree looking for a discrepancy
+		while ( ap[i] === bp[i] ) {
+			i++;
+		}
+
+		return i ?
+			// Do a sibling check if the nodes have a common ancestor
+			siblingCheck( ap[i], bp[i] ) :
+
+			// Otherwise nodes in our document sort first
+			ap[i] === preferredDoc ? -1 :
+			bp[i] === preferredDoc ? 1 :
+			0;
+	};
+
+	return doc;
+};
+
+Sizzle.matches = function( expr, elements ) {
+	return Sizzle( expr, null, null, elements );
+};
+
+Sizzle.matchesSelector = function( elem, expr ) {
+	// Set document vars if needed
+	if ( ( elem.ownerDocument || elem ) !== document ) {
+		setDocument( elem );
+	}
+
+	// Make sure that attribute selectors are quoted
+	expr = expr.replace( rattributeQuotes, "='$1']" );
+
+	if ( support.matchesSelector && documentIsHTML &&
+		( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
+		( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {
+
+		try {
+			var ret = matches.call( elem, expr );
+
+			// IE 9's matchesSelector returns false on disconnected nodes
+			if ( ret || support.disconnectedMatch ||
+					// As well, disconnected nodes are said to be in a document
+					// fragment in IE 9
+					elem.document && elem.document.nodeType !== 11 ) {
+				return ret;
+			}
+		} catch(e) {}
+	}
+
+	return Sizzle( expr, document, null, [ elem ] ).length > 0;
+};
+
+Sizzle.contains = function( context, elem ) {
+	// Set document vars if needed
+	if ( ( context.ownerDocument || context ) !== document ) {
+		setDocument( context );
+	}
+	return contains( context, elem );
+};
+
+Sizzle.attr = function( elem, name ) {
+	// Set document vars if needed
+	if ( ( elem.ownerDocument || elem ) !== document ) {
+		setDocument( elem );
+	}
+
+	var fn = Expr.attrHandle[ name.toLowerCase() ],
+		// Don't get fooled by Object.prototype properties (jQuery #13807)
+		val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
+			fn( elem, name, !documentIsHTML ) :
+			undefined;
+
+	return val !== undefined ?
+		val :
+		support.attributes || !documentIsHTML ?
+			elem.getAttribute( name ) :
+			(val = elem.getAttributeNode(name)) && val.specified ?
+				val.value :
+				null;
+};
+
+Sizzle.error = function( msg ) {
+	throw new Error( "Syntax error, unrecognized expression: " + msg );
+};
+
+/**
+ * Document sorting and removing duplicates
+ * @param {ArrayLike} results
+ */
+Sizzle.uniqueSort = function( results ) {
+	var elem,
+		duplicates = [],
+		j = 0,
+		i = 0;
+
+	// Unless we *know* we can detect duplicates, assume their presence
+	hasDuplicate = !support.detectDuplicates;
+	sortInput = !support.sortStable && results.slice( 0 );
+	results.sort( sortOrder );
+
+	if ( hasDuplicate ) {
+		while ( (elem = results[i++]) ) {
+			if ( elem === results[ i ] ) {
+				j = duplicates.push( i );
+			}
+		}
+		while ( j-- ) {
+			results.splice( duplicates[ j ], 1 );
+		}
+	}
+
+	// Clear input after sorting to release objects
+	// See https://github.com/jquery/sizzle/pull/225
+	sortInput = null;
+
+	return results;
+};
+
+/**
+ * Utility function for retrieving the text value of an array of DOM nodes
+ * @param {Array|Element} elem
+ */
+getText = Sizzle.getText = function( elem ) {
+	var node,
+		ret = "",
+		i = 0,
+		nodeType = elem.nodeType;
+
+	if ( !nodeType ) {
+		// If no nodeType, this is expected to be an array
+		while ( (node = elem[i++]) ) {
+			// Do not traverse comment nodes
+			ret += getText( node );
+		}
+	} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
+		// Use textContent for elements
+		// innerText usage removed for consistency of new lines (jQuery #11153)
+		if ( typeof elem.textContent === "string" ) {
+			return elem.textContent;
+		} else {
+			// Traverse its children
+			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
+				ret += getText( elem );
+			}
+		}
+	} else if ( nodeType === 3 || nodeType === 4 ) {
+		return elem.nodeValue;
+	}
+	// Do not include comment or processing instruction nodes
+
+	return ret;
+};
+
+Expr = Sizzle.selectors = {
+
+	// Can be adjusted by the user
+	cacheLength: 50,
+
+	createPseudo: markFunction,
+
+	match: matchExpr,
+
+	attrHandle: {},
+
+	find: {},
+
+	relative: {
+		">": { dir: "parentNode", first: true },
+		" ": { dir: "parentNode" },
+		"+": { dir: "previousSibling", first: true },
+		"~": { dir: "previousSibling" }
+	},
+
+	preFilter: {
+		"ATTR": function( match ) {
+			match[1] = match[1].replace( runescape, funescape );
+
+			// Move the given value to match[3] whether quoted or unquoted
+			match[3] = ( match[3] || match[4] || match[5] || "" ).replace( runescape, funescape );
+
+			if ( match[2] === "~=" ) {
+				match[3] = " " + match[3] + " ";
+			}
+
+			return match.slice( 0, 4 );
+		},
+
+		"CHILD": function( match ) {
+			/* matches from matchExpr["CHILD"]
+				1 type (only|nth|...)
+				2 what (child|of-type)
+				3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
+				4 xn-component of xn+y argument ([+-]?\d*n|)
+				5 sign of xn-component
+				6 x of xn-component
+				7 sign of y-component
+				8 y of y-component
+			*/
+			match[1] = match[1].toLowerCase();
+
+			if ( match[1].slice( 0, 3 ) === "nth" ) {
+				// nth-* requires argument
+				if ( !match[3] ) {
+					Sizzle.error( match[0] );
+				}
+
+				// numeric x and y parameters for Expr.filter.CHILD
+				// remember that false/true cast respectively to 0/1
+				match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
+				match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );
+
+			// other types prohibit arguments
+			} else if ( match[3] ) {
+				Sizzle.error( match[0] );
+			}
+
+			return match;
+		},
+
+		"PSEUDO": function( match ) {
+			var excess,
+				unquoted = !match[6] && match[2];
+
+			if ( matchExpr["CHILD"].test( match[0] ) ) {
+				return null;
+			}
+
+			// Accept quoted arguments as-is
+			if ( match[3] ) {
+				match[2] = match[4] || match[5] || "";
+
+			// Strip excess characters from unquoted arguments
+			} else if ( unquoted && rpseudo.test( unquoted ) &&
+				// Get excess from tokenize (recursively)
+				(excess = tokenize( unquoted, true )) &&
+				// advance to the next closing parenthesis
+				(excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {
+
+				// excess is a negative index
+				match[0] = match[0].slice( 0, excess );
+				match[2] = unquoted.slice( 0, excess );
+			}
+
+			// Return only captures needed by the pseudo filter method (type and argument)
+			return match.slice( 0, 3 );
+		}
+	},
+
+	filter: {
+
+		"TAG": function( nodeNameSelector ) {
+			var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
+			return nodeNameSelector === "*" ?
+				function() { return true; } :
+				function( elem ) {
+					return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
+				};
+		},
+
+		"CLASS": function( className ) {
+			var pattern = classCache[ className + " " ];
+
+			return pattern ||
+				(pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
+				classCache( className, function( elem ) {
+					return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
+				});
+		},
+
+		"ATTR": function( name, operator, check ) {
+			return function( elem ) {
+				var result = Sizzle.attr( elem, name );
+
+				if ( result == null ) {
+					return operator === "!=";
+				}
+				if ( !operator ) {
+					return true;
+				}
+
+				result += "";
+
+				return operator === "=" ? result === check :
+					operator === "!=" ? result !== check :
+					operator === "^=" ? check && result.indexOf( check ) === 0 :
+					operator === "*=" ? check && result.indexOf( check ) > -1 :
+					operator === "$=" ? check && result.slice( -check.length ) === check :
+					operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
+					operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
+					false;
+			};
+		},
+
+		"CHILD": function( type, what, argument, first, last ) {
+			var simple = type.slice( 0, 3 ) !== "nth",
+				forward = type.slice( -4 ) !== "last",
+				ofType = what === "of-type";
+
+			return first === 1 && last === 0 ?
+
+				// Shortcut for :nth-*(n)
+				function( elem ) {
+					return !!elem.parentNode;
+				} :
+
+				function( elem, context, xml ) {
+					var cache, outerCache, node, diff, nodeIndex, start,
+						dir = simple !== forward ? "nextSibling" : "previousSibling",
+						parent = elem.parentNode,
+						name = ofType && elem.nodeName.toLowerCase(),
+						useCache = !xml && !ofType;
+
+					if ( parent ) {
+
+						// :(first|last|only)-(child|of-type)
+						if ( simple ) {
+							while ( dir ) {
+								node = elem;
+								while ( (node = node[ dir ]) ) {
+									if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
+										return false;
+									}
+								}
+								// Reverse direction for :only-* (if we haven't yet done so)
+								start = dir = type === "only" && !start && "nextSibling";
+							}
+							return true;
+						}
+
+						start = [ forward ? parent.firstChild : parent.lastChild ];
+
+						// non-xml :nth-child(...) stores cache data on `parent`
+						if ( forward && useCache ) {
+							// Seek `elem` from a previously-cached index
+							outerCache = parent[ expando ] || (parent[ expando ] = {});
+							cache = outerCache[ type ] || [];
+							nodeIndex = cache[0] === dirruns && cache[1];
+							diff = cache[0] === dirruns && cache[2];
+							node = nodeIndex && parent.childNodes[ nodeIndex ];
+
+							while ( (node = ++nodeIndex && node && node[ dir ] ||
+
+								// Fallback to seeking `elem` from the start
+								(diff = nodeIndex = 0) || start.pop()) ) {
+
+								// When found, cache indexes on `parent` and break
+								if ( node.nodeType === 1 && ++diff && node === elem ) {
+									outerCache[ type ] = [ dirruns, nodeIndex, diff ];
+									break;
+								}
+							}
+
+						// Use previously-cached element index if available
+						} else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
+							diff = cache[1];
+
+						// xml :nth-child(...) or :nth-last-child(...) or :nth(-last)?-of-type(...)
+						} else {
+							// Use the same loop as above to seek `elem` from the start
+							while ( (node = ++nodeIndex && node && node[ dir ] ||
+								(diff = nodeIndex = 0) || start.pop()) ) {
+
+								if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
+									// Cache the index of each encountered element
+									if ( useCache ) {
+										(node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
+									}
+
+									if ( node === elem ) {
+										break;
+									}
+								}
+							}
+						}
+
+						// Incorporate the offset, then check against cycle size
+						diff -= last;
+						return diff === first || ( diff % first === 0 && diff / first >= 0 );
+					}
+				};
+		},
+
+		"PSEUDO": function( pseudo, argument ) {
+			// pseudo-class names are case-insensitive
+			// http://www.w3.org/TR/selectors/#pseudo-classes
+			// Prioritize by case sensitivity in case custom pseudos are added with uppercase letters
+			// Remember that setFilters inherits from pseudos
+			var args,
+				fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
+					Sizzle.error( "unsupported pseudo: " + pseudo );
+
+			// The user may use createPseudo to indicate that
+			// arguments are needed to create the filter function
+			// just as Sizzle does
+			if ( fn[ expando ] ) {
+				return fn( argument );
+			}
+
+			// But maintain support for old signatures
+			if ( fn.length > 1 ) {
+				args = [ pseudo, pseudo, "", argument ];
+				return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
+					markFunction(function( seed, matches ) {
+						var idx,
+							matched = fn( seed, argument ),
+							i = matched.length;
+						while ( i-- ) {
+							idx = indexOf.call( seed, matched[i] );
+							seed[ idx ] = !( matches[ idx ] = matched[i] );
+						}
+					}) :
+					function( elem ) {
+						return fn( elem, 0, args );
+					};
+			}
+
+			return fn;
+		}
+	},
+
+	pseudos: {
+		// Potentially complex pseudos
+		"not": markFunction(function( selector ) {
+			// Trim the selector passed to compile
+			// to avoid treating leading and trailing
+			// spaces as combinators
+			var input = [],
+				results = [],
+				matcher = compile( selector.replace( rtrim, "$1" ) );
+
+			return matcher[ expando ] ?
+				markFunction(function( seed, matches, context, xml ) {
+					var elem,
+						unmatched = matcher( seed, null, xml, [] ),
+						i = seed.length;
+
+					// Match elements unmatched by `matcher`
+					while ( i-- ) {
+						if ( (elem = unmatched[i]) ) {
+							seed[i] = !(matches[i] = elem);
+						}
+					}
+				}) :
+				function( elem, context, xml ) {
+					input[0] = elem;
+					matcher( input, null, xml, results );
+					return !results.pop();
+				};
+		}),
+
+		"has": markFunction(function( selector ) {
+			return function( elem ) {
+				return Sizzle( selector, elem ).length > 0;
+			};
+		}),
+
+		"contains": markFunction(function( text ) {
+			return function( elem ) {
+				return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
+			};
+		}),
+
+		// "Whether an element is represented by a :lang() selector
+		// is based solely on the element's language value
+		// being equal to the identifier C,
+		// or beginning with the identifier C immediately followed by "-".
+		// The matching of C against the element's language value is performed case-insensitively.
+		// The identifier C does not have to be a valid language name."
+		// http://www.w3.org/TR/selectors/#lang-pseudo
+		"lang": markFunction( function( lang ) {
+			// lang value must be a valid identifier
+			if ( !ridentifier.test(lang || "") ) {
+				Sizzle.error( "unsupported lang: " + lang );
+			}
+			lang = lang.replace( runescape, funescape ).toLowerCase();
+			return function( elem ) {
+				var elemLang;
+				do {
+					if ( (elemLang = documentIsHTML ?
+						elem.lang :
+						elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {
+
+						elemLang = elemLang.toLowerCase();
+						return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
+					}
+				} while ( (elem = elem.parentNode) && elem.nodeType === 1 );
+				return false;
+			};
+		}),
+
+		// Miscellaneous
+		"target": function( elem ) {
+			var hash = window.location && window.location.hash;
+			return hash && hash.slice( 1 ) === elem.id;
+		},
+
+		"root": function( elem ) {
+			return elem === docElem;
+		},
+
+		"focus": function( elem ) {
+			return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
+		},
+
+		// Boolean properties
+		"enabled": function( elem ) {
+			return elem.disabled === false;
+		},
+
+		"disabled": function( elem ) {
+			return elem.disabled === true;
+		},
+
+		"checked": function( elem ) {
+			// In CSS3, :checked should return both checked and selected elements
+			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
+			var nodeName = elem.nodeName.toLowerCase();
+			return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
+		},
+
+		"selected": function( elem ) {
+			// Accessing this property makes selected-by-default
+			// options in Safari work properly
+			if ( elem.parentNode ) {
+				elem.parentNode.selectedIndex;
+			}
+
+			return elem.selected === true;
+		},
+
+		// Contents
+		"empty": function( elem ) {
+			// http://www.w3.org/TR/selectors/#empty-pseudo
+			// :empty is negated by element (1) or content nodes (text: 3; cdata: 4; entity ref: 5),
+			//   but not by others (comment: 8; processing instruction: 7; etc.)
+			// nodeType < 6 works because attributes (2) do not appear as children
+			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
+				if ( elem.nodeType < 6 ) {
+					return false;
+				}
+			}
+			return true;
+		},
+
+		"parent": function( elem ) {
+			return !Expr.pseudos["empty"]( elem );
+		},
+
+		// Element/input types
+		"header": function( elem ) {
+			return rheader.test( elem.nodeName );
+		},
+
+		"input": function( elem ) {
+			return rinputs.test( elem.nodeName );
+		},
+
+		"button": function( elem ) {
+			var name = elem.nodeName.toLowerCase();
+			return name === "input" && elem.type === "button" || name === "button";
+		},
+
+		"text": function( elem ) {
+			var attr;
+			return elem.nodeName.toLowerCase() === "input" &&
+				elem.type === "text" &&
+
+				// Support: IE<8
+				// New HTML5 attribute values (e.g., "search") appear with elem.type === "text"
+				( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === "text" );
+		},
+
+		// Position-in-collection
+		"first": createPositionalPseudo(function() {
+			return [ 0 ];
+		}),
+
+		"last": createPositionalPseudo(function( matchIndexes, length ) {
+			return [ length - 1 ];
+		}),
+
+		"eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
+			return [ argument < 0 ? argument + length : argument ];
+		}),
+
+		"even": createPositionalPseudo(function( matchIndexes, length ) {
+			var i = 0;
+			for ( ; i < length; i += 2 ) {
+				matchIndexes.push( i );
+			}
+			return matchIndexes;
+		}),
+
+		"odd": createPositionalPseudo(function( matchIndexes, length ) {
+			var i = 1;
+			for ( ; i < length; i += 2 ) {
+				matchIndexes.push( i );
+			}
+			return matchIndexes;
+		}),
+
+		"lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
+			var i = argument < 0 ? argument + length : argument;
+			for ( ; --i >= 0; ) {
+				matchIndexes.push( i );
+			}
+			return matchIndexes;
+		}),
+
+		"gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
+			var i = argument < 0 ? argument + length : argument;
+			for ( ; ++i < length; ) {
+				matchIndexes.push( i );
+			}
+			return matchIndexes;
+		})
+	}
+};
+
+Expr.pseudos["nth"] = Expr.pseudos["eq"];
+
+// Add button/input type pseudos
+for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
+	Expr.pseudos[ i ] = createInputPseudo( i );
+}
+for ( i in { submit: true, reset: true } ) {
+	Expr.pseudos[ i ] = createButtonPseudo( i );
+}
+
+// Easy API for creating new setFilters
+function setFilters() {}
+setFilters.prototype = Expr.filters = Expr.pseudos;
+Expr.setFilters = new setFilters();
+
+tokenize = Sizzle.tokenize = function( selector, parseOnly ) {
+	var matched, match, tokens, type,
+		soFar, groups, preFilters,
+		cached = tokenCache[ selector + " " ];
+
+	if ( cached ) {
+		return parseOnly ? 0 : cached.slice( 0 );
+	}
+
+	soFar = selector;
+	groups = [];
+	preFilters = Expr.preFilter;
+
+	while ( soFar ) {
+
+		// Comma and first run
+		if ( !matched || (match = rcomma.exec( soFar )) ) {
+			if ( match ) {
+				// Don't consume trailing commas as valid
+				soFar = soFar.slice( match[0].length ) || soFar;
+			}
+			groups.push( (tokens = []) );
+		}
+
+		matched = false;
+
+		// Combinators
+		if ( (match = rcombinators.exec( soFar )) ) {
+			matched = match.shift();
+			tokens.push({
+				value: matched,
+				// Cast descendant combinators to space
+				type: match[0].replace( rtrim, " " )
+			});
+			soFar = soFar.slice( matched.length );
+		}
+
+		// Filters
+		for ( type in Expr.filter ) {
+			if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
+				(match = preFilters[ type ]( match ))) ) {
+				matched = match.shift();
+				tokens.push({
+					value: matched,
+					type: type,
+					matches: match
+				});
+				soFar = soFar.slice( matched.length );
+			}
+		}
+
+		if ( !matched ) {
+			break;
+		}
+	}
+
+	// Return the length of the invalid excess
+	// if we're just parsing
+	// Otherwise, throw an error or return tokens
+	return parseOnly ?
+		soFar.length :
+		soFar ?
+			Sizzle.error( selector ) :
+			// Cache the tokens
+			tokenCache( selector, groups ).slice( 0 );
+};
+
+function toSelector( tokens ) {
+	var i = 0,
+		len = tokens.length,
+		selector = "";
+	for ( ; i < len; i++ ) {
+		selector += tokens[i].value;
+	}
+	return selector;
+}
+
+function addCombinator( matcher, combinator, base ) {
+	var dir = combinator.dir,
+		checkNonElements = base && dir === "parentNode",
+		doneName = done++;
+
+	return combinator.first ?
+		// Check against closest ancestor/preceding element
+		function( elem, context, xml ) {
+			while ( (elem = elem[ dir ]) ) {
+				if ( elem.nodeType === 1 || checkNonElements ) {
+					return matcher( elem, context, xml );
+				}
+			}
+		} :
+
+		// Check against all ancestor/preceding elements
+		function( elem, context, xml ) {
+			var oldCache, outerCache,
+				newCache = [ dirruns, doneName ];
+
+			// We can't set arbitrary data on XML nodes, so they don't benefit from dir caching
+			if ( xml ) {
+				while ( (elem = elem[ dir ]) ) {
+					if ( elem.nodeType === 1 || checkNonElements ) {
+						if ( matcher( elem, context, xml ) ) {
+							return true;
+						}
+					}
+				}
+			} else {
+				while ( (elem = elem[ dir ]) ) {
+					if ( elem.nodeType === 1 || checkNonElements ) {
+						outerCache = elem[ expando ] || (elem[ expando ] = {});
+						if ( (oldCache = outerCache[ dir ]) &&
+							oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {
+
+							// Assign to newCache so results back-propagate to previous elements
+							return (newCache[ 2 ] = oldCache[ 2 ]);
+						} else {
+							// Reuse newcache so results back-propagate to previous elements
+							outerCache[ dir ] = newCache;
+
+							// A match means we're done; a fail means we have to keep checking
+							if ( (newCache[ 2 ] = matcher( elem, context, xml )) ) {
+								return true;
+							}
+						}
+					}
+				}
+			}
+		};
+}
+
+function elementMatcher( matchers ) {
+	return matchers.length > 1 ?
+		function( elem, context, xml ) {
+			var i = matchers.length;
+			while ( i-- ) {
+				if ( !matchers[i]( elem, context, xml ) ) {
+					return false;
+				}
+			}
+			return true;
+		} :
+		matchers[0];
+}
+
+function multipleContexts( selector, contexts, results ) {
+	var i = 0,
+		len = contexts.length;
+	for ( ; i < len; i++ ) {
+		Sizzle( selector, contexts[i], results );
+	}
+	return results;
+}
+
+function condense( unmatched, map, filter, context, xml ) {
+	var elem,
+		newUnmatched = [],
+		i = 0,
+		len = unmatched.length,
+		mapped = map != null;
+
+	for ( ; i < len; i++ ) {
+		if ( (elem = unmatched[i]) ) {
+			if ( !filter || filter( elem, context, xml ) ) {
+				newUnmatched.push( elem );
+				if ( mapped ) {
+					map.push( i );
+				}
+			}
+		}
+	}
+
+	return newUnmatched;
+}
+
+function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
+	if ( postFilter && !postFilter[ expando ] ) {
+		postFilter = setMatcher( postFilter );
+	}
+	if ( postFinder && !postFinder[ expando ] ) {
+		postFinder = setMatcher( postFinder, postSelector );
+	}
+	return markFunction(function( seed, results, context, xml ) {
+		var temp, i, elem,
+			preMap = [],
+			postMap = [],
+			preexisting = results.length,
+
+			// Get initial elements from seed or context
+			elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),
+
+			// Prefilter to get matcher input, preserving a map for seed-results synchronization
+			matcherIn = preFilter && ( seed || !selector ) ?
+				condense( elems, preMap, preFilter, context, xml ) :
+				elems,
+
+			matcherOut = matcher ?
+				// If we have a postFinder, or filtered seed, or non-seed postFilter or preexisting results,
+				postFinder || ( seed ? preFilter : preexisting || postFilter ) ?
+
+					// ...intermediate processing is necessary
+					[] :
+
+					// ...otherwise use results directly
+					results :
+				matcherIn;
+
+		// Find primary matches
+		if ( matcher ) {
+			matcher( matcherIn, matcherOut, context, xml );
+		}
+
+		// Apply postFilter
+		if ( postFilter ) {
+			temp = condense( matcherOut, postMap );
+			postFilter( temp, [], context, xml );
+
+			// Un-match failing elements by moving them back to matcherIn
+			i = temp.length;
+			while ( i-- ) {
+				if ( (elem = temp[i]) ) {
+					matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
+				}
+			}
+		}
+
+		if ( seed ) {
+			if ( postFinder || preFilter ) {
+				if ( postFinder ) {
+					// Get the final matcherOut by condensing this intermediate into postFinder contexts
+					temp = [];
+					i = matcherOut.length;
+					while ( i-- ) {
+						if ( (elem = matcherOut[i]) ) {
+							// Restore matcherIn since elem is not yet a final match
+							temp.push( (matcherIn[i] = elem) );
+						}
+					}
+					postFinder( null, (matcherOut = []), temp, xml );
+				}
+
+				// Move matched elements from seed to results to keep them synchronized
+				i = matcherOut.length;
+				while ( i-- ) {
+					if ( (elem = matcherOut[i]) &&
+						(temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {
+
+						seed[temp] = !(results[temp] = elem);
+					}
+				}
+			}
+
+		// Add elements to results, through postFinder if defined
+		} else {
+			matcherOut = condense(
+				matcherOut === results ?
+					matcherOut.splice( preexisting, matcherOut.length ) :
+					matcherOut
+			);
+			if ( postFinder ) {
+				postFinder( null, results, matcherOut, xml );
+			} else {
+				push.apply( results, matcherOut );
+			}
+		}
+	});
+}
+
+function matcherFromTokens( tokens ) {
+	var checkContext, matcher, j,
+		len = tokens.length,
+		leadingRelative = Expr.relative[ tokens[0].type ],
+		implicitRelative = leadingRelative || Expr.relative[" "],
+		i = leadingRelative ? 1 : 0,
+
+		// The foundational matcher ensures that elements are reachable from top-level context(s)
+		matchContext = addCombinator( function( elem ) {
+			return elem === checkContext;
+		}, implicitRelative, true ),
+		matchAnyContext = addCombinator( function( elem ) {
+			return indexOf.call( checkContext, elem ) > -1;
+		}, implicitRelative, true ),
+		matchers = [ function( elem, context, xml ) {
+			return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
+				(checkContext = context).nodeType ?
+					matchContext( elem, context, xml ) :
+					matchAnyContext( elem, context, xml ) );
+		} ];
+
+	for ( ; i < len; i++ ) {
+		if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
+			matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
+		} else {
+			matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );
+
+			// Return special upon seeing a positional matcher
+			if ( matcher[ expando ] ) {
+				// Find the next relative operator (if any) for proper handling
+				j = ++i;
+				for ( ; j < len; j++ ) {
+					if ( Expr.relative[ tokens[j].type ] ) {
+						break;
+					}
+				}
+				return setMatcher(
+					i > 1 && elementMatcher( matchers ),
+					i > 1 && toSelector(
+						// If the preceding token was a descendant combinator, insert an implicit any-element `*`
+						tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
+					).replace( rtrim, "$1" ),
+					matcher,
+					i < j && matcherFromTokens( tokens.slice( i, j ) ),
+					j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
+					j < len && toSelector( tokens )
+				);
+			}
+			matchers.push( matcher );
+		}
+	}
+
+	return elementMatcher( matchers );
+}
+
+function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
+	var bySet = setMatchers.length > 0,
+		byElement = elementMatchers.length > 0,
+		superMatcher = function( seed, context, xml, results, outermost ) {
+			var elem, j, matcher,
+				matchedCount = 0,
+				i = "0",
+				unmatched = seed && [],
+				setMatched = [],
+				contextBackup = outermostContext,
+				// We must always have either seed elements or outermost context
+				elems = seed || byElement && Expr.find["TAG"]( "*", outermost ),
+				// Use integer dirruns iff this is the outermost matcher
+				dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1),
+				len = elems.length;
+
+			if ( outermost ) {
+				outermostContext = context !== document && context;
+			}
+
+			// Add elements passing elementMatchers directly to results
+			// Keep `i` a string if there are no elements so `matchedCount` will be "00" below
+			// Support: IE<9, Safari
+			// Tolerate NodeList properties (IE: "length"; Safari: <number>) matching elements by id
+			for ( ; i !== len && (elem = elems[i]) != null; i++ ) {
+				if ( byElement && elem ) {
+					j = 0;
+					while ( (matcher = elementMatchers[j++]) ) {
+						if ( matcher( elem, context, xml ) ) {
+							results.push( elem );
+							break;
+						}
+					}
+					if ( outermost ) {
+						dirruns = dirrunsUnique;
+					}
+				}
+
+				// Track unmatched elements for set filters
+				if ( bySet ) {
+					// They will have gone through all possible matchers
+					if ( (elem = !matcher && elem) ) {
+						matchedCount--;
+					}
+
+					// Lengthen the array for every element, matched or not
+					if ( seed ) {
+						unmatched.push( elem );
+					}
+				}
+			}
+
+			// Apply set filters to unmatched elements
+			matchedCount += i;
+			if ( bySet && i !== matchedCount ) {
+				j = 0;
+				while ( (matcher = setMatchers[j++]) ) {
+					matcher( unmatched, setMatched, context, xml );
+				}
+
+				if ( seed ) {
+					// Reintegrate element matches to eliminate the need for sorting
+					if ( matchedCount > 0 ) {
+						while ( i-- ) {
+							if ( !(unmatched[i] || setMatched[i]) ) {
+								setMatched[i] = pop.call( results );
+							}
+						}
+					}
+
+					// Discard index placeholder values to get only actual matches
+					setMatched = condense( setMatched );
+				}
+
+				// Add matches to results
+				push.apply( results, setMatched );
+
+				// Seedless set matches succeeding multiple successful matchers stipulate sorting
+				if ( outermost && !seed && setMatched.length > 0 &&
+					( matchedCount + setMatchers.length ) > 1 ) {
+
+					Sizzle.uniqueSort( results );
+				}
+			}
+
+			// Override manipulation of globals by nested matchers
+			if ( outermost ) {
+				dirruns = dirrunsUnique;
+				outermostContext = contextBackup;
+			}
+
+			return unmatched;
+		};
+
+	return bySet ?
+		markFunction( superMatcher ) :
+		superMatcher;
+}
+
+compile = Sizzle.compile = function( selector, match /* Internal Use Only */ ) {
+	var i,
+		setMatchers = [],
+		elementMatchers = [],
+		cached = compilerCache[ selector + " " ];
+
+	if ( !cached ) {
+		// Generate a function of recursive functions that can be used to check each element
+		if ( !match ) {
+			match = tokenize( selector );
+		}
+		i = match.length;
+		while ( i-- ) {
+			cached = matcherFromTokens( match[i] );
+			if ( cached[ expando ] ) {
+				setMatchers.push( cached );
+			} else {
+				elementMatchers.push( cached );
+			}
+		}
+
+		// Cache the compiled function
+		cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );
+
+		// Save selector and tokenization
+		cached.selector = selector;
+	}
+	return cached;
+};
+
+/**
+ * A low-level selection function that works with Sizzle's compiled
+ *  selector functions
+ * @param {String|Function} selector A selector or a pre-compiled
+ *  selector function built with Sizzle.compile
+ * @param {Element} context
+ * @param {Array} [results]
+ * @param {Array} [seed] A set of elements to match against
+ */
+select = Sizzle.select = function( selector, context, results, seed ) {
+	var i, tokens, token, type, find,
+		compiled = typeof selector === "function" && selector,
+		match = !seed && tokenize( (selector = compiled.selector || selector) );
+
+	results = results || [];
+
+	// Try to minimize operations if there is no seed and only one group
+	if ( match.length === 1 ) {
+
+		// Take a shortcut and set the context if the root selector is an ID
+		tokens = match[0] = match[0].slice( 0 );
+		if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
+				support.getById && context.nodeType === 9 && documentIsHTML &&
+				Expr.relative[ tokens[1].type ] ) {
+
+			context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
+			if ( !context ) {
+				return results;
+
+			// Precompiled matchers will still verify ancestry, so step up a level
+			} else if ( compiled ) {
+				context = context.parentNode;
+			}
+
+			selector = selector.slice( tokens.shift().value.length );
+		}
+
+		// Fetch a seed set for right-to-left matching
+		i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
+		while ( i-- ) {
+			token = tokens[i];
+
+			// Abort if we hit a combinator
+			if ( Expr.relative[ (type = token.type) ] ) {
+				break;
+			}
+			if ( (find = Expr.find[ type ]) ) {
+				// Search, expanding context for leading sibling combinators
+				if ( (seed = find(
+					token.matches[0].replace( runescape, funescape ),
+					rsibling.test( tokens[0].type ) && testContext( context.parentNode ) || context
+				)) ) {
+
+					// If seed is empty or no tokens remain, we can return early
+					tokens.splice( i, 1 );
+					selector = seed.length && toSelector( tokens );
+					if ( !selector ) {
+						push.apply( results, seed );
+						return results;
+					}
+
+					break;
+				}
+			}
+		}
+	}
+
+	// Compile and execute a filtering function if one is not provided
+	// Provide `match` to avoid retokenization if we modified the selector above
+	( compiled || compile( selector, match ) )(
+		seed,
+		context,
+		!documentIsHTML,
+		results,
+		rsibling.test( selector ) && testContext( context.parentNode ) || context
+	);
+	return results;
+};
+
+// One-time assignments
+
+// Sort stability
+support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;
+
+// Support: Chrome<14
+// Always assume duplicates if they aren't passed to the comparison function
+support.detectDuplicates = !!hasDuplicate;
+
+// Initialize against the default document
+setDocument();
+
+// Support: Webkit<537.32 - Safari 6.0.3/Chrome 25 (fixed in Chrome 27)
+// Detached nodes confoundingly follow *each other*
+support.sortDetached = assert(function( div1 ) {
+	// Should return 1, but returns 4 (following)
+	return div1.compareDocumentPosition( document.createElement("div") ) & 1;
+});
+
+// Support: IE<8
+// Prevent attribute/property "interpolation"
+// http://msdn.microsoft.com/en-us/library/ms536429%28VS.85%29.aspx
+if ( !assert(function( div ) {
+	div.innerHTML = "<a href='#'></a>";
+	return div.firstChild.getAttribute("href") === "#" ;
+}) ) {
+	addHandle( "type|href|height|width", function( elem, name, isXML ) {
+		if ( !isXML ) {
+			return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
+		}
+	});
+}
+
+// Support: IE<9
+// Use defaultValue in place of getAttribute("value")
+if ( !support.attributes || !assert(function( div ) {
+	div.innerHTML = "<input/>";
+	div.firstChild.setAttribute( "value", "" );
+	return div.firstChild.getAttribute( "value" ) === "";
+}) ) {
+	addHandle( "value", function( elem, name, isXML ) {
+		if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
+			return elem.defaultValue;
+		}
+	});
+}
+
+// Support: IE<9
+// Use getAttributeNode to fetch booleans when getAttribute lies
+if ( !assert(function( div ) {
+	return div.getAttribute("disabled") == null;
+}) ) {
+	addHandle( booleans, function( elem, name, isXML ) {
+		var val;
+		if ( !isXML ) {
+			return elem[ name ] === true ? name.toLowerCase() :
+					(val = elem.getAttributeNode( name )) && val.specified ?
+					val.value :
+				null;
+		}
+	});
+}
+
+return Sizzle;
+
+})( window );
+
+
+
+jQuery.find = Sizzle;
+jQuery.expr = Sizzle.selectors;
+jQuery.expr[":"] = jQuery.expr.pseudos;
+jQuery.unique = Sizzle.uniqueSort;
+jQuery.text = Sizzle.getText;
+jQuery.isXMLDoc = Sizzle.isXML;
+jQuery.contains = Sizzle.contains;
+
+
+
+var rneedsContext = jQuery.expr.match.needsContext;
+
+var rsingleTag = (/^<(\w+)\s*\/?>(?:<\/\1>|)$/);
+
+
+
+var risSimple = /^.[^:#\[\.,]*$/;
+
+// Implement the identical functionality for filter and not
+function winnow( elements, qualifier, not ) {
+	if ( jQuery.isFunction( qualifier ) ) {
+		return jQuery.grep( elements, function( elem, i ) {
+			/* jshint -W018 */
+			return !!qualifier.call( elem, i, elem ) !== not;
+		});
+
+	}
+
+	if ( qualifier.nodeType ) {
+		return jQuery.grep( elements, function( elem ) {
+			return ( elem === qualifier ) !== not;
+		});
+
+	}
+
+	if ( typeof qualifier === "string" ) {
+		if ( risSimple.test( qualifier ) ) {
+			return jQuery.filter( qualifier, elements, not );
+		}
+
+		qualifier = jQuery.filter( qualifier, elements );
+	}
+
+	return jQuery.grep( elements, function( elem ) {
+		return ( indexOf.call( qualifier, elem ) >= 0 ) !== not;
+	});
+}
+
+jQuery.filter = function( expr, elems, not ) {
+	var elem = elems[ 0 ];
+
+	if ( not ) {
+		expr = ":not(" + expr + ")";
+	}
+
+	return elems.length === 1 && elem.nodeType === 1 ?
+		jQuery.find.matchesSelector( elem, expr ) ? [ elem ] : [] :
+		jQuery.find.matches( expr, jQuery.grep( elems, function( elem ) {
+			return elem.nodeType === 1;
+		}));
+};
+
+jQuery.fn.extend({
+	find: function( selector ) {
+		var i,
+			len = this.length,
+			ret = [],
+			self = this;
+
+		if ( typeof selector !== "string" ) {
+			return this.pushStack( jQuery( selector ).filter(function() {
+				for ( i = 0; i < len; i++ ) {
+					if ( jQuery.contains( self[ i ], this ) ) {
+						return true;
+					}
+				}
+			}) );
+		}
+
+		for ( i = 0; i < len; i++ ) {
+			jQuery.find( selector, self[ i ], ret );
+		}
+
+		// Needed because $( selector, context ) becomes $( context ).find( selector )
+		ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
+		ret.selector = this.selector ? this.selector + " " + selector : selector;
+		return ret;
+	},
+	filter: function( selector ) {
+		return this.pushStack( winnow(this, selector || [], false) );
+	},
+	not: function( selector ) {
+		return this.pushStack( winnow(this, selector || [], true) );
+	},
+	is: function( selector ) {
+		return !!winnow(
+			this,
+
+			// If this is a positional/relative selector, check membership in the returned set
+			// so $("p:first").is("p:last") won't return true for a doc with two "p".
+			typeof selector === "string" && rneedsContext.test( selector ) ?
+				jQuery( selector ) :
+				selector || [],
+			false
+		).length;
+	}
+});
+
+
+// Initialize a jQuery object
+
+
+// A central reference to the root jQuery(document)
+var rootjQuery,
+
+	// A simple way to check for HTML strings
+	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
+	// Strict HTML recognition (#11290: must start with <)
+	rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]*))$/,
+
+	init = jQuery.fn.init = function( selector, context ) {
+		var match, elem;
+
+		// HANDLE: $(""), $(null), $(undefined), $(false)
+		if ( !selector ) {
+			return this;
+		}
+
+		// Handle HTML strings
+		if ( typeof selector === "string" ) {
+			if ( selector[0] === "<" && selector[ selector.length - 1 ] === ">" && selector.length >= 3 ) {
+				// Assume that strings that start and end with <> are HTML and skip the regex check
+				match = [ null, selector, null ];
+
+			} else {
+				match = rquickExpr.exec( selector );
+			}
+
+			// Match html or make sure no context is specified for #id
+			if ( match && (match[1] || !context) ) {
+
+				// HANDLE: $(html) -> $(array)
+				if ( match[1] ) {
+					context = context instanceof jQuery ? context[0] : context;
+
+					// scripts is true for back-compat
+					// Intentionally let the error be thrown if parseHTML is not present
+					jQuery.merge( this, jQuery.parseHTML(
+						match[1],
+						context && context.nodeType ? context.ownerDocument || context : document,
+						true
+					) );
+
+					// HANDLE: $(html, props)
+					if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
+						for ( match in context ) {
+							// Properties of context are called as methods if possible
+							if ( jQuery.isFunction( this[ match ] ) ) {
+								this[ match ]( context[ match ] );
+
+							// ...and otherwise set as attributes
+							} else {
+								this.attr( match, context[ match ] );
+							}
+						}
+					}
+
+					return this;
+
+				// HANDLE: $(#id)
+				} else {
+					elem = document.getElementById( match[2] );
+
+					// Check parentNode to catch when Blackberry 4.6 returns
+					// nodes that are no longer in the document #6963
+					if ( elem && elem.parentNode ) {
+						// Inject the element directly into the jQuery object
+						this.length = 1;
+						this[0] = elem;
+					}
+
+					this.context = document;
+					this.selector = selector;
+					return this;
+				}
+
+			// HANDLE: $(expr, $(...))
+			} else if ( !context || context.jquery ) {
+				return ( context || rootjQuery ).find( selector );
+
+			// HANDLE: $(expr, context)
+			// (which is just equivalent to: $(context).find(expr)
+			} else {
+				return this.constructor( context ).find( selector );
+			}
+
+		// HANDLE: $(DOMElement)
+		} else if ( selector.nodeType ) {
+			this.context = this[0] = selector;
+			this.length = 1;
+			return this;
+
+		// HANDLE: $(function)
+		// Shortcut for document ready
+		} else if ( jQuery.isFunction( selector ) ) {
+			return typeof rootjQuery.ready !== "undefined" ?
+				rootjQuery.ready( selector ) :
+				// Execute immediately if ready is not present
+				selector( jQuery );
+		}
+
+		if ( selector.selector !== undefined ) {
+			this.selector = selector.selector;
+			this.context = selector.context;
+		}
+
+		return jQuery.makeArray( selector, this );
+	};
+
+// Give the init function the jQuery prototype for later instantiation
+init.prototype = jQuery.fn;
+
+// Initialize central reference
+rootjQuery = jQuery( document );
+
+
+var rparentsprev = /^(?:parents|prev(?:Until|All))/,
+	// methods guaranteed to produce a unique set when starting from a unique set
+	guaranteedUnique = {
+		children: true,
+		contents: true,
+		next: true,
+		prev: true
+	};
+
+jQuery.extend({
+	dir: function( elem, dir, until ) {
+		var matched = [],
+			truncate = until !== undefined;
+
+		while ( (elem = elem[ dir ]) && elem.nodeType !== 9 ) {
+			if ( elem.nodeType === 1 ) {
+				if ( truncate && jQuery( elem ).is( until ) ) {
+					break;
+				}
+				matched.push( elem );
+			}
+		}
+		return matched;
+	},
+
+	sibling: function( n, elem ) {
+		var matched = [];
+
+		for ( ; n; n = n.nextSibling ) {
+			if ( n.nodeType === 1 && n !== elem ) {
+				matched.push( n );
+			}
+		}
+
+		return matched;
+	}
+});
+
+jQuery.fn.extend({
+	has: function( target ) {
+		var targets = jQuery( target, this ),
+			l = targets.length;
+
+		return this.filter(function() {
+			var i = 0;
+			for ( ; i < l; i++ ) {
+				if ( jQuery.contains( this, targets[i] ) ) {
+					return true;
+				}
+			}
+		});
+	},
+
+	closest: function( selectors, context ) {
+		var cur,
+			i = 0,
+			l = this.length,
+			matched = [],
+			pos = rneedsContext.test( selectors ) || typeof selectors !== "string" ?
+				jQuery( selectors, context || this.context ) :
+				0;
+
+		for ( ; i < l; i++ ) {
+			for ( cur = this[i]; cur && cur !== context; cur = cur.parentNode ) {
+				// Always skip document fragments
+				if ( cur.nodeType < 11 && (pos ?
+					pos.index(cur) > -1 :
+
+					// Don't pass non-elements to Sizzle
+					cur.nodeType === 1 &&
+						jQuery.find.matchesSelector(cur, selectors)) ) {
+
+					matched.push( cur );
+					break;
+				}
+			}
+		}
+
+		return this.pushStack( matched.length > 1 ? jQuery.unique( matched ) : matched );
+	},
+
+	// Determine the position of an element within
+	// the matched set of elements
+	index: function( elem ) {
+
+		// No argument, return index in parent
+		if ( !elem ) {
+			return ( this[ 0 ] && this[ 0 ].parentNode ) ? this.first().prevAll().length : -1;
+		}
+
+		// index in selector
+		if ( typeof elem === "string" ) {
+			return indexOf.call( jQuery( elem ), this[ 0 ] );
+		}
+
+		// Locate the position of the desired element
+		return indexOf.call( this,
+
+			// If it receives a jQuery object, the first element is used
+			elem.jquery ? elem[ 0 ] : elem
+		);
+	},
+
+	add: function( selector, context ) {
+		return this.pushStack(
+			jQuery.unique(
+				jQuery.merge( this.get(), jQuery( selector, context ) )
+			)
+		);
+	},
+
+	addBack: function( selector ) {
+		return this.add( selector == null ?
+			this.prevObject : this.prevObject.filter(selector)
+		);
+	}
+});
+
+function sibling( cur, dir ) {
+	while ( (cur = cur[dir]) && cur.nodeType !== 1 ) {}
+	return cur;
+}
+
+jQuery.each({
+	parent: function( elem ) {
+		var parent = elem.parentNode;
+		return parent && parent.nodeType !== 11 ? parent : null;
+	},
+	parents: function( elem ) {
+		return jQuery.dir( elem, "parentNode" );
+	},
+	parentsUntil: function( elem, i, until ) {
+		return jQuery.dir( elem, "parentNode", until );
+	},
+	next: function( elem ) {
+		return sibling( elem, "nextSibling" );
+	},
+	prev: function( elem ) {
+		return sibling( elem, "previousSibling" );
+	},
+	nextAll: function( elem ) {
+		return jQuery.dir( elem, "nextSibling" );
+	},
+	prevAll: function( elem ) {
+		return jQuery.dir( elem, "previousSibling" );
+	},
+	nextUntil: function( elem, i, until ) {
+		return jQuery.dir( elem, "nextSibling", until );
+	},
+	prevUntil: function( elem, i, until ) {
+		return jQuery.dir( elem, "previousSibling", until );
+	},
+	siblings: function( elem ) {
+		return jQuery.sibling( ( elem.parentNode || {} ).firstChild, elem );
+	},
+	children: function( elem ) {
+		return jQuery.sibling( elem.firstChild );
+	},
+	contents: function( elem ) {
+		return elem.contentDocument || jQuery.merge( [], elem.childNodes );
+	}
+}, function( name, fn ) {
+	jQuery.fn[ name ] = function( until, selector ) {
+		var matched = jQuery.map( this, fn, until );
+
+		if ( name.slice( -5 ) !== "Until" ) {
+			selector = until;
+		}
+
+		if ( selector && typeof selector === "string" ) {
+			matched = jQuery.filter( selector, matched );
+		}
+
+		if ( this.length > 1 ) {
+			// Remove duplicates
+			if ( !guaranteedUnique[ name ] ) {
+				jQuery.unique( matched );
+			}
+
+			// Reverse order for parents* and prev-derivatives
+			if ( rparentsprev.test( name ) ) {
+				matched.reverse();
+			}
+		}
+
+		return this.pushStack( matched );
+	};
+});
+var rnotwhite = (/\S+/g);
+
+
+
+// String to Object options format cache
+var optionsCache = {};
+
+// Convert String-formatted options into Object-formatted ones and store in cache
+function createOptions( options ) {
+	var object = optionsCache[ options ] = {};
+	jQuery.each( options.match( rnotwhite ) || [], function( _, flag ) {
+		object[ flag ] = true;
+	});
+	return object;
+}
+
+/*
+ * Create a callback list using the following parameters:
+ *
+ *	options: an optional list of space-separated options that will change how
+ *			the callback list behaves or a more traditional option object
+ *
+ * By default a callback list will act like an event callback list and can be
+ * "fired" multiple times.
+ *
+ * Possible options:
+ *
+ *	once:			will ensure the callback list can only be fired once (like a Deferred)
+ *
+ *	memory:			will keep track of previous values and will call any callback added
+ *					after the list has been fired right away with the latest "memorized"
+ *					values (like a Deferred)
+ *
+ *	unique:			will ensure a callback can only be added once (no duplicate in the list)
+ *
+ *	stopOnFalse:	interrupt callings when a callback returns false
+ *
+ */
+jQuery.Callbacks = function( options ) {
+
+	// Convert options from String-formatted to Object-formatted if needed
+	// (we check in cache first)
+	options = typeof options === "string" ?
+		( optionsCache[ options ] || createOptions( options ) ) :
+		jQuery.extend( {}, options );
+
+	var // Last fire value (for non-forgettable lists)
+		memory,
+		// Flag to know if list was already fired
+		fired,
+		// Flag to know if list is currently firing
+		firing,
+		// First callback to fire (used internally by add and fireWith)
+		firingStart,
+		// End of the loop when firing
+		firingLength,
+		// Index of currently firing callback (modified by remove if needed)
+		firingIndex,
+		// Actual callback list
+		list = [],
+		// Stack of fire calls for repeatable lists
+		stack = !options.once && [],
+		// Fire callbacks
+		fire = function( data ) {
+			memory = options.memory && data;
+			fired = true;
+			firingIndex = firingStart || 0;
+			firingStart = 0;
+			firingLength = list.length;
+			firing = true;
+			for ( ; list && firingIndex < firingLength; firingIndex++ ) {
+				if ( list[ firingIndex ].apply( data[ 0 ], data[ 1 ] ) === false && options.stopOnFalse ) {
+					memory = false; // To prevent further calls using add
+					break;
+				}
+			}
+			firing = false;
+			if ( list ) {
+				if ( stack ) {
+					if ( stack.length ) {
+						fire( stack.shift() );
+					}
+				} else if ( memory ) {
+					list = [];
+				} else {
+					self.disable();
+				}
+			}
+		},
+		// Actual Callbacks object
+		self = {
+			// Add a callback or a collection of callbacks to the list
+			add: function() {
+				if ( list ) {
+					// First, we save the current length
+					var start = list.length;
+					(function add( args ) {
+						jQuery.each( args, function( _, arg ) {
+							var type = jQuery.type( arg );
+							if ( type === "function" ) {
+								if ( !options.unique || !self.has( arg ) ) {
+									list.push( arg );
+								}
+							} else if ( arg && arg.length && type !== "string" ) {
+								// Inspect recursively
+								add( arg );
+							}
+						});
+					})( arguments );
+					// Do we need to add the callbacks to the
+					// current firing batch?
+					if ( firing ) {
+						firingLength = list.length;
+					// With memory, if we're not firing then
+					// we should call right away
+					} else if ( memory ) {
+						firingStart = start;
+						fire( memory );
+					}
+				}
+				return this;
+			},
+			// Remove a callback from the list
+			remove: function() {
+				if ( list ) {
+					jQuery.each( arguments, function( _, arg ) {
+						var index;
+						while ( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
+							list.splice( index, 1 );
+							// Handle firing indexes
+							if ( firing ) {
+								if ( index <= firingLength ) {
+									firingLength--;
+								}
+								if ( index <= firingIndex ) {
+									firingIndex--;
+								}
+							}
+						}
+					});
+				}
+				return this;
+			},
+			// Check if a given callback is in the list.
+			// If no argument is given, return whether or not list has callbacks attached.
+			has: function( fn ) {
+				return fn ? jQuery.inArray( fn, list ) > -1 : !!( list && list.length );
+			},
+			// Remove all callbacks from the list
+			empty: function() {
+				list = [];
+				firingLength = 0;
+				return this;
+			},
+			// Have the list do nothing anymore
+			disable: function() {
+				list = stack = memory = undefined;
+				return this;
+			},
+			// Is it disabled?
+			disabled: function() {
+				return !list;
+			},
+			// Lock the list in its current state
+			lock: function() {
+				stack = undefined;
+				if ( !memory ) {
+					self.disable();
+				}
+				return this;
+			},
+			// Is it locked?
+			locked: function() {
+				return !stack;
+			},
+			// Call all callbacks with the given context and arguments
+			fireWith: function( context, args ) {
+				if ( list && ( !fired || stack ) ) {
+					args = args || [];
+					args = [ context, args.slice ? args.slice() : args ];
+					if ( firing ) {
+						stack.push( args );
+					} else {
+						fire( args );
+					}
+				}
+				return this;
+			},
+			// Call all the callbacks with the given arguments
+			fire: function() {
+				self.fireWith( this, arguments );
+				return this;
+			},
+			// To know if the callbacks have already been called at least once
+			fired: function() {
+				return !!fired;
+			}
+		};
+
+	return self;
+};
+
+
+jQuery.extend({
+
+	Deferred: function( func ) {
+		var tuples = [
+				// action, add listener, listener list, final state
+				[ "resolve", "done", jQuery.Callbacks("once memory"), "resolved" ],
+				[ "reject", "fail", jQuery.Callbacks("once memory"), "rejected" ],
+				[ "notify", "progress", jQuery.Callbacks("memory") ]
+			],
+			state = "pending",
+			promise = {
+				state: function() {
+					return state;
+				},
+				always: function() {
+					deferred.done( arguments ).fail( arguments );
+					return this;
+				},
+				then: function( /* fnDone, fnFail, fnProgress */ ) {
+					var fns = arguments;
+					return jQuery.Deferred(function( newDefer ) {
+						jQuery.each( tuples, function( i, tuple ) {
+							var fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];
+							// deferred[ done | fail | progress ] for forwarding actions to newDefer
+							deferred[ tuple[1] ](function() {
+								var returned = fn && fn.apply( this, arguments );
+								if ( returned && jQuery.isFunction( returned.promise ) ) {
+									returned.promise()
+										.done( newDefer.resolve )
+										.fail( newDefer.reject )
+										.progress( newDefer.notify );
+								} else {
+									newDefer[ tuple[ 0 ] + "With" ]( this === promise ? newDefer.promise() : this, fn ? [ returned ] : arguments );
+								}
+							});
+						});
+						fns = null;
+					}).promise();
+				},
+				// Get a promise for this deferred
+				// If obj is provided, the promise aspect is added to the object
+				promise: function( obj ) {
+					return obj != null ? jQuery.extend( obj, promise ) : promise;
+				}
+			},
+			deferred = {};
+
+		// Keep pipe for back-compat
+		promise.pipe = promise.then;
+
+		// Add list-specific methods
+		jQuery.each( tuples, function( i, tuple ) {
+			var list = tuple[ 2 ],
+				stateString = tuple[ 3 ];
+
+			// promise[ done | fail | progress ] = list.add
+			promise[ tuple[1] ] = list.add;
+
+			// Handle state
+			if ( stateString ) {
+				list.add(function() {
+					// state = [ resolved | rejected ]
+					state = stateString;
+
+				// [ reject_list | resolve_list ].disable; progress_list.lock
+				}, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
+			}
+
+			// deferred[ resolve | reject | notify ]
+			deferred[ tuple[0] ] = function() {
+				deferred[ tuple[0] + "With" ]( this === deferred ? promise : this, arguments );
+				return this;
+			};
+			deferred[ tuple[0] + "With" ] = list.fireWith;
+		});
+
+		// Make the deferred a promise
+		promise.promise( deferred );
+
+		// Call given func if any
+		if ( func ) {
+			func.call( deferred, deferred );
+		}
+
+		// All done!
+		return deferred;
+	},
+
+	// Deferred helper
+	when: function( subordinate /* , ..., subordinateN */ ) {
+		var i = 0,
+			resolveValues = slice.call( arguments ),
+			length = resolveValues.length,
+
+			// the count of uncompleted subordinates
+			remaining = length !== 1 || ( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,
+
+			// the master Deferred. If resolveValues consist of only a single Deferred, just use that.
+			deferred = remaining === 1 ? subordinate : jQuery.Deferred(),
+
+			// Update function for both resolve and progress values
+			updateFunc = function( i, contexts, values ) {
+				return function( value ) {
+					contexts[ i ] = this;
+					values[ i ] = arguments.length > 1 ? slice.call( arguments ) : value;
+					if ( values === progressValues ) {
+						deferred.notifyWith( contexts, values );
+					} else if ( !( --remaining ) ) {
+						deferred.resolveWith( contexts, values );
+					}
+				};
+			},
+
+			progressValues, progressContexts, resolveContexts;
+
+		// add listeners to Deferred subordinates; treat others as resolved
+		if ( length > 1 ) {
+			progressValues = new Array( length );
+			progressContexts = new Array( length );
+			resolveContexts = new Array( length );
+			for ( ; i < length; i++ ) {
+				if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
+					resolveValues[ i ].promise()
+						.done( updateFunc( i, resolveContexts, resolveValues ) )
+						.fail( deferred.reject )
+						.progress( updateFunc( i, progressContexts, progressValues ) );
+				} else {
+					--remaining;
+				}
+			}
+		}
+
+		// if we're not waiting on anything, resolve the master
+		if ( !remaining ) {
+			deferred.resolveWith( resolveContexts, resolveValues );
+		}
+
+		return deferred.promise();
+	}
+});
+
+
+// The deferred used on DOM ready
+var readyList;
+
+jQuery.fn.ready = function( fn ) {
+	// Add the callback
+	jQuery.ready.promise().done( fn );
+
+	return this;
+};
+
+jQuery.extend({
+	// Is the DOM ready to be used? Set to true once it occurs.
+	isReady: false,
+
+	// A counter to track how many items to wait for before
+	// the ready event fires. See #6781
+	readyWait: 1,
+
+	// Hold (or release) the ready event
+	holdReady: function( hold ) {
+		if ( hold ) {
+			jQuery.readyWait++;
+		} else {
+			jQuery.ready( true );
+		}
+	},
+
+	// Handle when the DOM is ready
+	ready: function( wait ) {
+
+		// Abort if there are pending holds or we're already ready
+		if ( wait === true ? --jQuery.readyWait : jQuery.isReady ) {
+			return;
+		}
+
+		// Remember that the DOM is ready
+		jQuery.isReady = true;
+
+		// If a normal DOM Ready event fired, decrement, and wait if need be
+		if ( wait !== true && --jQuery.readyWait > 0 ) {
+			return;
+		}
+
+		// If there are functions bound, to execute
+		readyList.resolveWith( document, [ jQuery ] );
+
+		// Trigger any bound ready events
+		if ( jQuery.fn.triggerHandler ) {
+			jQuery( document ).triggerHandler( "ready" );
+			jQuery( document ).off( "ready" );
+		}
+	}
+});
+
+/**
+ * The ready event handler and self cleanup method
+ */
+function completed() {
+	document.removeEventListener( "DOMContentLoaded", completed, false );
+	window.removeEventListener( "load", completed, false );
+	jQuery.ready();
+}
+
+jQuery.ready.promise = function( obj ) {
+	if ( !readyList ) {
+
+		readyList = jQuery.Deferred();
+
+		// Catch cases where $(document).ready() is called after the browser event has already occurred.
+		// we once tried to use readyState "interactive" here, but it caused issues like the one
+		// discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15
+		if ( document.readyState === "complete" ) {
+			// Handle it asynchronously to allow scripts the opportunity to delay ready
+			setTimeout( jQuery.ready );
+
+		} else {
+
+			// Use the handy event callback
+			document.addEventListener( "DOMContentLoaded", completed, false );
+
+			// A fallback to window.onload, that will always work
+			window.addEventListener( "load", completed, false );
+		}
+	}
+	return readyList.promise( obj );
+};
+
+// Kick off the DOM ready check even if the user does not
+jQuery.ready.promise();
+
+
+
+
+// Multifunctional method to get and set values of a collection
+// The value/s can optionally be executed if it's a function
+var access = jQuery.access = function( elems, fn, key, value, chainable, emptyGet, raw ) {
+	var i = 0,
+		len = elems.length,
+		bulk = key == null;
+
+	// Sets many values
+	if ( jQuery.type( key ) === "object" ) {
+		chainable = true;
+		for ( i in key ) {
+			jQuery.access( elems, fn, i, key[i], true, emptyGet, raw );
+		}
+
+	// Sets one value
+	} else if ( value !== undefined ) {
+		chainable = true;
+
+		if ( !jQuery.isFunction( value ) ) {
+			raw = true;
+		}
+
+		if ( bulk ) {
+			// Bulk operations run against the entire set
+			if ( raw ) {
+				fn.call( elems, value );
+				fn = null;
+
+			// ...except when executing function values
+			} else {
+				bulk = fn;
+				fn = function( elem, key, value ) {
+					return bulk.call( jQuery( elem ), value );
+				};
+			}
+		}
+
+		if ( fn ) {
+			for ( ; i < len; i++ ) {
+				fn( elems[i], key, raw ? value : value.call( elems[i], i, fn( elems[i], key ) ) );
+			}
+		}
+	}
+
+	return chainable ?
+		elems :
+
+		// Gets
+		bulk ?
+			fn.call( elems ) :
+			len ? fn( elems[0], key ) : emptyGet;
+};
+
+
+/**
+ * Determines whether an object can have data
+ */
+jQuery.acceptData = function( owner ) {
+	// Accepts only:
+	//  - Node
+	//    - Node.ELEMENT_NODE
+	//    - Node.DOCUMENT_NODE
+	//  - Object
+	//    - Any
+	/* jshint -W018 */
+	return owner.nodeType === 1 || owner.nodeType === 9 || !( +owner.nodeType );
+};
+
+
+function Data() {
+	// Support: Android < 4,
+	// Old WebKit does not have Object.preventExtensions/freeze method,
+	// return new empty object instead with no [[set]] accessor
+	Object.defineProperty( this.cache = {}, 0, {
+		get: function() {
+			return {};
+		}
+	});
+
+	this.expando = jQuery.expando + Math.random();
+}
+
+Data.uid = 1;
+Data.accepts = jQuery.acceptData;
+
+Data.prototype = {
+	key: function( owner ) {
+		// We can accept data for non-element nodes in modern browsers,
+		// but we should not, see #8335.
+		// Always return the key for a frozen object.
+		if ( !Data.accepts( owner ) ) {
+			return 0;
+		}
+
+		var descriptor = {},
+			// Check if the owner object already has a cache key
+			unlock = owner[ this.expando ];
+
+		// If not, create one
+		if ( !unlock ) {
+			unlock = Data.uid++;
+
+			// Secure it in a non-enumerable, non-writable property
+			try {
+				descriptor[ this.expando ] = { value: unlock };
+				Object.defineProperties( owner, descriptor );
+
+			// Support: Android < 4
+			// Fallback to a less secure definition
+			} catch ( e ) {
+				descriptor[ this.expando ] = unlock;
+				jQuery.extend( owner, descriptor );
+			}
+		}
+
+		// Ensure the cache object
+		if ( !this.cache[ unlock ] ) {
+			this.cache[ unlock ] = {};
+		}
+
+		return unlock;
+	},
+	set: function( owner, data, value ) {
+		var prop,
+			// There may be an unlock assigned to this node,
+			// if there is no entry for this "owner", create one inline
+			// and set the unlock as though an owner entry had always existed
+			unlock = this.key( owner ),
+			cache = this.cache[ unlock ];
+
+		// Handle: [ owner, key, value ] args
+		if ( typeof data === "string" ) {
+			cache[ data ] = value;
+
+		// Handle: [ owner, { properties } ] args
+		} else {
+			// Fresh assignments by object are shallow copied
+			if ( jQuery.isEmptyObject( cache ) ) {
+				jQuery.extend( this.cache[ unlock ], data );
+			// Otherwise, copy the properties one-by-one to the cache object
+			} else {
+				for ( prop in data ) {
+					cache[ prop ] = data[ prop ];
+				}
+			}
+		}
+		return cache;
+	},
+	get: function( owner, key ) {
+		// Either a valid cache is found, or will be created.
+		// New caches will be created and the unlock returned,
+		// allowing direct access to the newly created
+		// empty data object. A valid owner object must be provided.
+		var cache = this.cache[ this.key( owner ) ];
+
+		return key === undefined ?
+			cache : cache[ key ];
+	},
+	access: function( owner, key, value ) {
+		var stored;
+		// In cases where either:
+		//
+		//   1. No key was specified
+		//   2. A string key was specified, but no value provided
+		//
+		// Take the "read" path and allow the get method to determine
+		// which value to return, respectively either:
+		//
+		//   1. The entire cache object
+		//   2. The data stored at the key
+		//
+		if ( key === undefined ||
+				((key && typeof key === "string") && value === undefined) ) {
+
+			stored = this.get( owner, key );
+
+			return stored !== undefined ?
+				stored : this.get( owner, jQuery.camelCase(key) );
+		}
+
+		// [*]When the key is not a string, or both a key and value
+		// are specified, set or extend (existing objects) with either:
+		//
+		//   1. An object of properties
+		//   2. A key and value
+		//
+		this.set( owner, key, value );
+
+		// Since the "set" path can have two possible entry points
+		// return the expected data based on which path was taken[*]
+		return value !== undefined ? value : key;
+	},
+	remove: function( owner, key ) {
+		var i, name, camel,
+			unlock = this.key( owner ),
+			cache = this.cache[ unlock ];
+
+		if ( key === undefined ) {
+			this.cache[ unlock ] = {};
+
+		} else {
+			// Support array or space separated string of keys
+			if ( jQuery.isArray( key ) ) {
+				// If "name" is an array of keys...
+				// When data is initially created, via ("key", "val") signature,
+				// keys will be converted to camelCase.
+				// Since there is no way to tell _how_ a key was added, remove
+				// both plain key and camelCase key. #12786
+				// This will only penalize the array argument path.
+				name = key.concat( key.map( jQuery.camelCase ) );
+			} else {
+				camel = jQuery.camelCase( key );
+				// Try the string as a key before any manipulation
+				if ( key in cache ) {
+					name = [ key, camel ];
+				} else {
+					// If a key with the spaces exists, use it.
+					// Otherwise, create an array by matching non-whitespace
+					name = camel;
+					name = name in cache ?
+						[ name ] : ( name.match( rnotwhite ) || [] );
+				}
+			}
+
+			i = name.length;
+			while ( i-- ) {
+				delete cache[ name[ i ] ];
+			}
+		}
+	},
+	hasData: function( owner ) {
+		return !jQuery.isEmptyObject(
+			this.cache[ owner[ this.expando ] ] || {}
+		);
+	},
+	discard: function( owner ) {
+		if ( owner[ this.expando ] ) {
+			delete this.cache[ owner[ this.expando ] ];
+		}
+	}
+};
+var data_priv = new Data();
+
+var data_user = new Data();
+
+
+
+/*
+	Implementation Summary
+
+	1. Enforce API surface and semantic compatibility with 1.9.x branch
+	2. Improve the module's maintainability by reducing the storage
+		paths to a single mechanism.
+	3. Use the same single mechanism to support "private" and "user" data.
+	4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)
+	5. Avoid exposing implementation details on user objects (eg. expando properties)
+	6. Provide a clear path for implementation upgrade to WeakMap in 2014
+*/
+var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/,
+	rmultiDash = /([A-Z])/g;
+
+function dataAttr( elem, key, data ) {
+	var name;
+
+	// If nothing was found internally, try to fetch any
+	// data from the HTML5 data-* attribute
+	if ( data === undefined && elem.nodeType === 1 ) {
+		name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();
+		data = elem.getAttribute( name );
+
+		if ( typeof data === "string" ) {
+			try {
+				data = data === "true" ? true :
+					data === "false" ? false :
+					data === "null" ? null :
+					// Only convert to a number if it doesn't change the string
+					+data + "" === data ? +data :
+					rbrace.test( data ) ? jQuery.parseJSON( data ) :
+					data;
+			} catch( e ) {}
+
+			// Make sure we set the data so it isn't changed later
+			data_user.set( elem, key, data );
+		} else {
+			data = undefined;
+		}
+	}
+	return data;
+}
+
+jQuery.extend({
+	hasData: function( elem ) {
+		return data_user.hasData( elem ) || data_priv.hasData( elem );
+	},
+
+	data: function( elem, name, data ) {
+		return data_user.access( elem, name, data );
+	},
+
+	removeData: function( elem, name ) {
+		data_user.remove( elem, name );
+	},
+
+	// TODO: Now that all calls to _data and _removeData have been replaced
+	// with direct calls to data_priv methods, these can be deprecated.
+	_data: function( elem, name, data ) {
+		return data_priv.access( elem, name, data );
+	},
+
+	_removeData: function( elem, name ) {
+		data_priv.remove( elem, name );
+	}
+});
+
+jQuery.fn.extend({
+	data: function( key, value ) {
+		var i, name, data,
+			elem = this[ 0 ],
+			attrs = elem && elem.attributes;
+
+		// Gets all values
+		if ( key === undefined ) {
+			if ( this.length ) {
+				data = data_user.get( elem );
+
+				if ( elem.nodeType === 1 && !data_priv.get( elem, "hasDataAttrs" ) ) {
+					i = attrs.length;
+					while ( i-- ) {
+
+						// Support: IE11+
+						// The attrs elements can be null (#14894)
+						if ( attrs[ i ] ) {
+							name = attrs[ i ].name;
+							if ( name.indexOf( "data-" ) === 0 ) {
+								name = jQuery.camelCase( name.slice(5) );
+								dataAttr( elem, name, data[ name ] );
+							}
+						}
+					}
+					data_priv.set( elem, "hasDataAttrs", true );
+				}
+			}
+
+			return data;
+		}
+
+		// Sets multiple values
+		if ( typeof key === "object" ) {
+			return this.each(function() {
+				data_user.set( this, key );
+			});
+		}
+
+		return access( this, function( value ) {
+			var data,
+				camelKey = jQuery.camelCase( key );
+
+			// The calling jQuery object (element matches) is not empty
+			// (and therefore has an element appears at this[ 0 ]) and the
+			// `value` parameter was not undefined. An empty jQuery object
+			// will result in `undefined` for elem = this[ 0 ] which will
+			// throw an exception if an attempt to read a data cache is made.
+			if ( elem && value === undefined ) {
+				// Attempt to get data from the cache
+				// with the key as-is
+				data = data_user.get( elem, key );
+				if ( data !== undefined ) {
+					return data;
+				}
+
+				// Attempt to get data from the cache
+				// with the key camelized
+				data = data_user.get( elem, camelKey );
+				if ( data !== undefined ) {
+					return data;
+				}
+
+				// Attempt to "discover" the data in
+				// HTML5 custom data-* attrs
+				data = dataAttr( elem, camelKey, undefined );
+				if ( data !== undefined ) {
+					return data;
+				}
+
+				// We tried really hard, but the data doesn't exist.
+				return;
+			}
+
+			// Set the data...
+			this.each(function() {
+				// First, attempt to store a copy or reference of any
+				// data that might've been store with a camelCased key.
+				var data = data_user.get( this, camelKey );
+
+				// For HTML5 data-* attribute interop, we have to
+				// store property names with dashes in a camelCase form.
+				// This might not apply to all properties...*
+				data_user.set( this, camelKey, value );
+
+				// *... In the case of properties that might _actually_
+				// have dashes, we need to also store a copy of that
+				// unchanged property.
+				if ( key.indexOf("-") !== -1 && data !== undefined ) {
+					data_user.set( this, key, value );
+				}
+			});
+		}, null, value, arguments.length > 1, null, true );
+	},
+
+	removeData: function( key ) {
+		return this.each(function() {
+			data_user.remove( this, key );
+		});
+	}
+});
+
+
+jQuery.extend({
+	queue: function( elem, type, data ) {
+		var queue;
+
+		if ( elem ) {
+			type = ( type || "fx" ) + "queue";
+			queue = data_priv.get( elem, type );
+
+			// Speed up dequeue by getting out quickly if this is just a lookup
+			if ( data ) {
+				if ( !queue || jQuery.isArray( data ) ) {
+					queue = data_priv.access( elem, type, jQuery.makeArray(data) );
+				} else {
+					queue.push( data );
+				}
+			}
+			return queue || [];
+		}
+	},
+
+	dequeue: function( elem, type ) {
+		type = type || "fx";
+
+		var queue = jQuery.queue( elem, type ),
+			startLength = queue.length,
+			fn = queue.shift(),
+			hooks = jQuery._queueHooks( elem, type ),
+			next = function() {
+				jQuery.dequeue( elem, type );
+			};
+
+		// If the fx queue is dequeued, always remove the progress sentinel
+		if ( fn === "inprogress" ) {
+			fn = queue.shift();
+			startLength--;
+		}
+
+		if ( fn ) {
+
+			// Add a progress sentinel to prevent the fx queue from being
+			// automatically dequeued
+			if ( type === "fx" ) {
+				queue.unshift( "inprogress" );
+			}
+
+			// clear up the last queue stop function
+			delete hooks.stop;
+			fn.call( elem, next, hooks );
+		}
+
+		if ( !startLength && hooks ) {
+			hooks.empty.fire();
+		}
+	},
+
+	// not intended for public consumption - generates a queueHooks object, or returns the current one
+	_queueHooks: function( elem, type ) {
+		var key = type + "queueHooks";
+		return data_priv.get( elem, key ) || data_priv.access( elem, key, {
+			empty: jQuery.Callbacks("once memory").add(function() {
+				data_priv.remove( elem, [ type + "queue", key ] );
+			})
+		});
+	}
+});
+
+jQuery.fn.extend({
+	queue: function( type, data ) {
+		var setter = 2;
+
+		if ( typeof type !== "string" ) {
+			data = type;
+			type = "fx";
+			setter--;
+		}
+
+		if ( arguments.length < setter ) {
+			return jQuery.queue( this[0], type );
+		}
+
+		return data === undefined ?
+			this :
+			this.each(function() {
+				var queue = jQuery.queue( this, type, data );
+
+				// ensure a hooks for this queue
+				jQuery._queueHooks( this, type );
+
+				if ( type === "fx" && queue[0] !== "inprogress" ) {
+					jQuery.dequeue( this, type );
+				}
+			});
+	},
+	dequeue: function( type ) {
+		return this.each(function() {
+			jQuery.dequeue( this, type );
+		});
+	},
+	clearQueue: function( type ) {
+		return this.queue( type || "fx", [] );
+	},
+	// Get a promise resolved when queues of a certain type
+	// are emptied (fx is the type by default)
+	promise: function( type, obj ) {
+		var tmp,
+			count = 1,
+			defer = jQuery.Deferred(),
+			elements = this,
+			i = this.length,
+			resolve = function() {
+				if ( !( --count ) ) {
+					defer.resolveWith( elements, [ elements ] );
+				}
+			};
+
+		if ( typeof type !== "string" ) {
+			obj = type;
+			type = undefined;
+		}
+		type = type || "fx";
+
+		while ( i-- ) {
+			tmp = data_priv.get( elements[ i ], type + "queueHooks" );
+			if ( tmp && tmp.empty ) {
+				count++;
+				tmp.empty.add( resolve );
+			}
+		}
+		resolve();
+		return defer.promise( obj );
+	}
+});
+var pnum = (/[+-]?(?:\d*\.|)\d+(?:[eE][+-]?\d+|)/).source;
+
+var cssExpand = [ "Top", "Right", "Bottom", "Left" ];
+
+var isHidden = function( elem, el ) {
+		// isHidden might be called from jQuery#filter function;
+		// in that case, element will be second argument
+		elem = el || elem;
+		return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );
+	};
+
+var rcheckableType = (/^(?:checkbox|radio)$/i);
+
+
+
+(function() {
+	var fragment = document.createDocumentFragment(),
+		div = fragment.appendChild( document.createElement( "div" ) ),
+		input = document.createElement( "input" );
+
+	// #11217 - WebKit loses check when the name is after the checked attribute
+	// Support: Windows Web Apps (WWA)
+	// `name` and `type` need .setAttribute for WWA
+	input.setAttribute( "type", "radio" );
+	input.setAttribute( "checked", "checked" );
+	input.setAttribute( "name", "t" );
+
+	div.appendChild( input );
+
+	// Support: Safari 5.1, iOS 5.1, Android 4.x, Android 2.3
+	// old WebKit doesn't clone checked state correctly in fragments
+	support.checkClone = div.cloneNode( true ).cloneNode( true ).lastChild.checked;
+
+	// Make sure textarea (and checkbox) defaultValue is properly cloned
+	// Support: IE9-IE11+
+	div.innerHTML = "<textarea>x</textarea>";
+	support.noCloneChecked = !!div.cloneNode( true ).lastChild.defaultValue;
+})();
+var strundefined = typeof undefined;
+
+
+
+support.focusinBubbles = "onfocusin" in window;
+
+
+var
+	rkeyEvent = /^key/,
+	rmouseEvent = /^(?:mouse|pointer|contextmenu)|click/,
+	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
+	rtypenamespace = /^([^.]*)(?:\.(.+)|)$/;
+
+function returnTrue() {
+	return true;
+}
+
+function returnFalse() {
+	return false;
+}
+
+function safeActiveElement() {
+	try {
+		return document.activeElement;
+	} catch ( err ) { }
+}
+
+/*
+ * Helper functions for managing events -- not part of the public interface.
+ * Props to Dean Edwards' addEvent library for many of the ideas.
+ */
+jQuery.event = {
+
+	global: {},
+
+	add: function( elem, types, handler, data, selector ) {
+
+		var handleObjIn, eventHandle, tmp,
+			events, t, handleObj,
+			special, handlers, type, namespaces, origType,
+			elemData = data_priv.get( elem );
+
+		// Don't attach events to noData or text/comment nodes (but allow plain objects)
+		if ( !elemData ) {
+			return;
+		}
+
+		// Caller can pass in an object of custom data in lieu of the handler
+		if ( handler.handler ) {
+			handleObjIn = handler;
+			handler = handleObjIn.handler;
+			selector = handleObjIn.selector;
+		}
+
+		// Make sure that the handler has a unique ID, used to find/remove it later
+		if ( !handler.guid ) {
+			handler.guid = jQuery.guid++;
+		}
+
+		// Init the element's event structure and main handler, if this is the first
+		if ( !(events = elemData.events) ) {
+			events = elemData.events = {};
+		}
+		if ( !(eventHandle = elemData.handle) ) {
+			eventHandle = elemData.handle = function( e ) {
+				// Discard the second event of a jQuery.event.trigger() and
+				// when an event is called after a page has unloaded
+				return typeof jQuery !== strundefined && jQuery.event.triggered !== e.type ?
+					jQuery.event.dispatch.apply( elem, arguments ) : undefined;
+			};
+		}
+
+		// Handle multiple events separated by a space
+		types = ( types || "" ).match( rnotwhite ) || [ "" ];
+		t = types.length;
+		while ( t-- ) {
+			tmp = rtypenamespace.exec( types[t] ) || [];
+			type = origType = tmp[1];
+			namespaces = ( tmp[2] || "" ).split( "." ).sort();
+
+			// There *must* be a type, no attaching namespace-only handlers
+			if ( !type ) {
+				continue;
+			}
+
+			// If event changes its type, use the special event handlers for the changed type
+			special = jQuery.event.special[ type ] || {};
+
+			// If selector defined, determine special event api type, otherwise given type
+			type = ( selector ? special.delegateType : special.bindType ) || type;
+
+			// Update special based on newly reset type
+			special = jQuery.event.special[ type ] || {};
+
+			// handleObj is passed to all event handlers
+			handleObj = jQuery.extend({
+				type: type,
+				origType: origType,
+				data: data,
+				handler: handler,
+				guid: handler.guid,
+				selector: selector,
+				needsContext: selector && jQuery.expr.match.needsContext.test( selector ),
+				namespace: namespaces.join(".")
+			}, handleObjIn );
+
+			// Init the event handler queue if we're the first
+			if ( !(handlers = events[ type ]) ) {
+				handlers = events[ type ] = [];
+				handlers.delegateCount = 0;
+
+				// Only use addEventListener if the special events handler returns false
+				if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
+					if ( elem.addEventListener ) {
+						elem.addEventListener( type, eventHandle, false );
+					}
+				}
+			}
+
+			if ( special.add ) {
+				special.add.call( elem, handleObj );
+
+				if ( !handleObj.handler.guid ) {
+					handleObj.handler.guid = handler.guid;
+				}
+			}
+
+			// Add to the element's handler list, delegates in front
+			if ( selector ) {
+				handlers.splice( handlers.delegateCount++, 0, handleObj );
+			} else {
+				handlers.push( handleObj );
+			}
+
+			// Keep track of which events have ever been used, for event optimization
+			jQuery.event.global[ type ] = true;
+		}
+
+	},
+
+	// Detach an event or set of events from an element
+	remove: function( elem, types, handler, selector, mappedTypes ) {
+
+		var j, origCount, tmp,
+			events, t, handleObj,
+			special, handlers, type, namespaces, origType,
+			elemData = data_priv.hasData( elem ) && data_priv.get( elem );
+
+		if ( !elemData || !(events = elemData.events) ) {
+			return;
+		}
+
+		// Once for each type.namespace in types; type may be omitted
+		types = ( types || "" ).match( rnotwhite ) || [ "" ];
+		t = types.length;
+		while ( t-- ) {
+			tmp = rtypenamespace.exec( types[t] ) || [];
+			type = origType = tmp[1];
+			namespaces = ( tmp[2] || "" ).split( "." ).sort();
+
+			// Unbind all events (on this namespace, if provided) for the element
+			if ( !type ) {
+				for ( type in events ) {
+					jQuery.event.remove( elem, type + types[ t ], handler, selector, true );
+				}
+				continue;
+			}
+
+			special = jQuery.event.special[ type ] || {};
+			type = ( selector ? special.delegateType : special.bindType ) || type;
+			handlers = events[ type ] || [];
+			tmp = tmp[2] && new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" );
+
+			// Remove matching events
+			origCount = j = handlers.length;
+			while ( j-- ) {
+				handleObj = handlers[ j ];
+
+				if ( ( mappedTypes || origType === handleObj.origType ) &&
+					( !handler || handler.guid === handleObj.guid ) &&
+					( !tmp || tmp.test( handleObj.namespace ) ) &&
+					( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) ) {
+					handlers.splice( j, 1 );
+
+					if ( handleObj.selector ) {
+						handlers.delegateCount--;
+					}
+					if ( special.remove ) {
+						special.remove.call( elem, handleObj );
+					}
+				}
+			}
+
+			// Remove generic event handler if we removed something and no more handlers exist
+			// (avoids potential for endless recursion during removal of special event handlers)
+			if ( origCount && !handlers.length ) {
+				if ( !special.teardown || special.teardown.call( elem, namespaces, elemData.handle ) === false ) {
+					jQuery.removeEvent( elem, type, elemData.handle );
+				}
+
+				delete events[ type ];
+			}
+		}
+
+		// Remove the expando if it's no longer used
+		if ( jQuery.isEmptyObject( events ) ) {
+			delete elemData.handle;
+			data_priv.remove( elem, "events" );
+		}
+	},
+
+	trigger: function( event, data, elem, onlyHandlers ) {
+
+		var i, cur, tmp, bubbleType, ontype, handle, special,
+			eventPath = [ elem || document ],
+			type = hasOwn.call( event, "type" ) ? event.type : event,
+			namespaces = hasOwn.call( event, "namespace" ) ? event.namespace.split(".") : [];
+
+		cur = tmp = elem = elem || document;
+
+		// Don't do events on text and comment nodes
+		if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
+			return;
+		}
+
+		// focus/blur morphs to focusin/out; ensure we're not firing them right now
+		if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
+			return;
+		}
+
+		if ( type.indexOf(".") >= 0 ) {
+			// Namespaced trigger; create a regexp to match event type in handle()
+			namespaces = type.split(".");
+			type = namespaces.shift();
+			namespaces.sort();
+		}
+		ontype = type.indexOf(":") < 0 && "on" + type;
+
+		// Caller can pass in a jQuery.Event object, Object, or just an event type string
+		event = event[ jQuery.expando ] ?
+			event :
+			new jQuery.Event( type, typeof event === "object" && event );
+
+		// Trigger bitmask: & 1 for native handlers; & 2 for jQuery (always true)
+		event.isTrigger = onlyHandlers ? 2 : 3;
+		event.namespace = namespaces.join(".");
+		event.namespace_re = event.namespace ?
+			new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" ) :
+			null;
+
+		// Clean up the event in case it is being reused
+		event.result = undefined;
+		if ( !event.target ) {
+			event.target = elem;
+		}
+
+		// Clone any incoming data and prepend the event, creating the handler arg list
+		data = data == null ?
+			[ event ] :
+			jQuery.makeArray( data, [ event ] );
+
+		// Allow special events to draw outside the lines
+		special = jQuery.event.special[ type ] || {};
+		if ( !onlyHandlers && special.trigger && special.trigger.apply( elem, data ) === false ) {
+			return;
+		}
+
+		// Determine event propagation path in advance, per W3C events spec (#9951)
+		// Bubble up to document, then to window; watch for a global ownerDocument var (#9724)
+		if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {
+
+			bubbleType = special.delegateType || type;
+			if ( !rfocusMorph.test( bubbleType + type ) ) {
+				cur = cur.parentNode;
+			}
+			for ( ; cur; cur = cur.parentNode ) {
+				eventPath.push( cur );
+				tmp = cur;
+			}
+
+			// Only add window if we got to document (e.g., not plain obj or detached DOM)
+			if ( tmp === (elem.ownerDocument || document) ) {
+				eventPath.push( tmp.defaultView || tmp.parentWindow || window );
+			}
+		}
+
+		// Fire handlers on the event path
+		i = 0;
+		while ( (cur = eventPath[i++]) && !event.isPropagationStopped() ) {
+
+			event.type = i > 1 ?
+				bubbleType :
+				special.bindType || type;
+
+			// jQuery handler
+			handle = ( data_priv.get( cur, "events" ) || {} )[ event.type ] && data_priv.get( cur, "handle" );
+			if ( handle ) {
+				handle.apply( cur, data );
+			}
+
+			// Native handler
+			handle = ontype && cur[ ontype ];
+			if ( handle && handle.apply && jQuery.acceptData( cur ) ) {
+				event.result = handle.apply( cur, data );
+				if ( event.result === false ) {
+					event.preventDefault();
+				}
+			}
+		}
+		event.type = type;
+
+		// If nobody prevented the default action, do it now
+		if ( !onlyHandlers && !event.isDefaultPrevented() ) {
+
+			if ( (!special._default || special._default.apply( eventPath.pop(), data ) === false) &&
+				jQuery.acceptData( elem ) ) {
+
+				// Call a native DOM method on the target with the same name name as the event.
+				// Don't do default actions on window, that's where global variables be (#6170)
+				if ( ontype && jQuery.isFunction( elem[ type ] ) && !jQuery.isWindow( elem ) ) {
+
+					// Don't re-trigger an onFOO event when we call its FOO() method
+					tmp = elem[ ontype ];
+
+					if ( tmp ) {
+						elem[ ontype ] = null;
+					}
+
+					// Prevent re-triggering of the same event, since we already bubbled it above
+					jQuery.event.triggered = type;
+					elem[ type ]();
+					jQuery.event.triggered = undefined;
+
+					if ( tmp ) {
+						elem[ ontype ] = tmp;
+					}
+				}
+			}
+		}
+
+		return event.result;
+	},
+
+	dispatch: function( event ) {
+
+		// Make a writable jQuery.Event from the native event object
+		event = jQuery.event.fix( event );
+
+		var i, j, ret, matched, handleObj,
+			handlerQueue = [],
+			args = slice.call( arguments ),
+			handlers = ( data_priv.get( this, "events" ) || {} )[ event.type ] || [],
+			special = jQuery.event.special[ event.type ] || {};
+
+		// Use the fix-ed jQuery.Event rather than the (read-only) native event
+		args[0] = event;
+		event.delegateTarget = this;
+
+		// Call the preDispatch hook for the mapped type, and let it bail if desired
+		if ( special.preDispatch && special.preDispatch.call( this, event ) === false ) {
+			return;
+		}
+
+		// Determine handlers
+		handlerQueue = jQuery.event.handlers.call( this, event, handlers );
+
+		// Run delegates first; they may want to stop propagation beneath us
+		i = 0;
+		while ( (matched = handlerQueue[ i++ ]) && !event.isPropagationStopped() ) {
+			event.currentTarget = matched.elem;
+
+			j = 0;
+			while ( (handleObj = matched.handlers[ j++ ]) && !event.isImmediatePropagationStopped() ) {
+
+				// Triggered event must either 1) have no namespace, or
+				// 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
+				if ( !event.namespace_re || event.namespace_re.test( handleObj.namespace ) ) {
+
+					event.handleObj = handleObj;
+					event.data = handleObj.data;
+
+					ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
+							.apply( matched.elem, args );
+
+					if ( ret !== undefined ) {
+						if ( (event.result = ret) === false ) {
+							event.preventDefault();
+							event.stopPropagation();
+						}
+					}
+				}
+			}
+		}
+
+		// Call the postDispatch hook for the mapped type
+		if ( special.postDispatch ) {
+			special.postDispatch.call( this, event );
+		}
+
+		return event.result;
+	},
+
+	handlers: function( event, handlers ) {
+		var i, matches, sel, handleObj,
+			handlerQueue = [],
+			delegateCount = handlers.delegateCount,
+			cur = event.target;
+
+		// Find delegate handlers
+		// Black-hole SVG <use> instance trees (#13180)
+		// Avoid non-left-click bubbling in Firefox (#3861)
+		if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {
+
+			for ( ; cur !== this; cur = cur.parentNode || this ) {
+
+				// Don't process clicks on disabled elements (#6911, #8165, #11382, #11764)
+				if ( cur.disabled !== true || event.type !== "click" ) {
+					matches = [];
+					for ( i = 0; i < delegateCount; i++ ) {
+						handleObj = handlers[ i ];
+
+						// Don't conflict with Object.prototype properties (#13203)
+						sel = handleObj.selector + " ";
+
+						if ( matches[ sel ] === undefined ) {
+							matches[ sel ] = handleObj.needsContext ?
+								jQuery( sel, this ).index( cur ) >= 0 :
+								jQuery.find( sel, this, null, [ cur ] ).length;
+						}
+						if ( matches[ sel ] ) {
+							matches.push( handleObj );
+						}
+					}
+					if ( matches.length ) {
+						handlerQueue.push({ elem: cur, handlers: matches });
+					}
+				}
+			}
+		}
+
+		// Add the remaining (directly-bound) handlers
+		if ( delegateCount < handlers.length ) {
+			handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
+		}
+
+		return handlerQueue;
+	},
+
+	// Includes some event props shared by KeyEvent and MouseEvent
+	props: "altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),
+
+	fixHooks: {},
+
+	keyHooks: {
+		props: "char charCode key keyCode".split(" "),
+		filter: function( event, original ) {
+
+			// Add which for key events
+			if ( event.which == null ) {
+				event.which = original.charCode != null ? original.charCode : original.keyCode;
+			}
+
+			return event;
+		}
+	},
+
+	mouseHooks: {
+		props: "button buttons clientX clientY offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
+		filter: function( event, original ) {
+			var eventDoc, doc, body,
+				button = original.button;
+
+			// Calculate pageX/Y if missing and clientX/Y available
+			if ( event.pageX == null && original.clientX != null ) {
+				eventDoc = event.target.ownerDocument || document;
+				doc = eventDoc.documentElement;
+				body = eventDoc.body;
+
+				event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
+				event.pageY = original.clientY + ( doc && doc.scrollTop  || body && body.scrollTop  || 0 ) - ( doc && doc.clientTop  || body && body.clientTop  || 0 );
+			}
+
+			// Add which for click: 1 === left; 2 === middle; 3 === right
+			// Note: button is not normalized, so don't use it
+			if ( !event.which && button !== undefined ) {
+				event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
+			}
+
+			return event;
+		}
+	},
+
+	fix: function( event ) {
+		if ( event[ jQuery.expando ] ) {
+			return event;
+		}
+
+		// Create a writable copy of the event object and normalize some properties
+		var i, prop, copy,
+			type = event.type,
+			originalEvent = event,
+			fixHook = this.fixHooks[ type ];
+
+		if ( !fixHook ) {
+			this.fixHooks[ type ] = fixHook =
+				rmouseEvent.test( type ) ? this.mouseHooks :
+				rkeyEvent.test( type ) ? this.keyHooks :
+				{};
+		}
+		copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;
+
+		event = new jQuery.Event( originalEvent );
+
+		i = copy.length;
+		while ( i-- ) {
+			prop = copy[ i ];
+			event[ prop ] = originalEvent[ prop ];
+		}
+
+		// Support: Cordova 2.5 (WebKit) (#13255)
+		// All events should have a target; Cordova deviceready doesn't
+		if ( !event.target ) {
+			event.target = document;
+		}
+
+		// Support: Safari 6.0+, Chrome < 28
+		// Target should not be a text node (#504, #13143)
+		if ( event.target.nodeType === 3 ) {
+			event.target = event.target.parentNode;
+		}
+
+		return fixHook.filter ? fixHook.filter( event, originalEvent ) : event;
+	},
+
+	special: {
+		load: {
+			// Prevent triggered image.load events from bubbling to window.load
+			noBubble: true
+		},
+		focus: {
+			// Fire native event if possible so blur/focus sequence is correct
+			trigger: function() {
+				if ( this !== safeActiveElement() && this.focus ) {
+					this.focus();
+					return false;
+				}
+			},
+			delegateType: "focusin"
+		},
+		blur: {
+			trigger: function() {
+				if ( this === safeActiveElement() && this.blur ) {
+					this.blur();
+					return false;
+				}
+			},
+			delegateType: "focusout"
+		},
+		click: {
+			// For checkbox, fire native event so checked state will be right
+			trigger: function() {
+				if ( this.type === "checkbox" && this.click && jQuery.nodeName( this, "input" ) ) {
+					this.click();
+					return false;
+				}
+			},
+
+			// For cross-browser consistency, don't fire native .click() on links
+			_default: function( event ) {
+				return jQuery.nodeName( event.target, "a" );
+			}
+		},
+
+		beforeunload: {
+			postDispatch: function( event ) {
+
+				// Support: Firefox 20+
+				// Firefox doesn't alert if the returnValue field is not set.
+				if ( event.result !== undefined && event.originalEvent ) {
+					event.originalEvent.returnValue = event.result;
+				}
+			}
+		}
+	},
+
+	simulate: function( type, elem, event, bubble ) {
+		// Piggyback on a donor event to simulate a different one.
+		// Fake originalEvent to avoid donor's stopPropagation, but if the
+		// simulated event prevents default then we do the same on the donor.
+		var e = jQuery.extend(
+			new jQuery.Event(),
+			event,
+			{
+				type: type,
+				isSimulated: true,
+				originalEvent: {}
+			}
+		);
+		if ( bubble ) {
+			jQuery.event.trigger( e, null, elem );
+		} else {
+			jQuery.event.dispatch.call( elem, e );
+		}
+		if ( e.isDefaultPrevented() ) {
+			event.preventDefault();
+		}
+	}
+};
+
+jQuery.removeEvent = function( elem, type, handle ) {
+	if ( elem.removeEventListener ) {
+		elem.removeEventListener( type, handle, false );
+	}
+};
+
+jQuery.Event = function( src, props ) {
+	// Allow instantiation without the 'new' keyword
+	if ( !(this instanceof jQuery.Event) ) {
+		return new jQuery.Event( src, props );
+	}
+
+	// Event object
+	if ( src && src.type ) {
+		this.originalEvent = src;
+		this.type = src.type;
+
+		// Events bubbling up the document may have been marked as prevented
+		// by a handler lower down the tree; reflect the correct value.
+		this.isDefaultPrevented = src.defaultPrevented ||
+				src.defaultPrevented === undefined &&
+				// Support: Android < 4.0
+				src.returnValue === false ?
+			returnTrue :
+			returnFalse;
+
+	// Event type
+	} else {
+		this.type = src;
+	}
+
+	// Put explicitly provided properties onto the event object
+	if ( props ) {
+		jQuery.extend( this, props );
+	}
+
+	// Create a timestamp if incoming event doesn't have one
+	this.timeStamp = src && src.timeStamp || jQuery.now();
+
+	// Mark it as fixed
+	this[ jQuery.expando ] = true;
+};
+
+// jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
+// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
+jQuery.Event.prototype = {
+	isDefaultPrevented: returnFalse,
+	isPropagationStopped: returnFalse,
+	isImmediatePropagationStopped: returnFalse,
+
+	preventDefault: function() {
+		var e = this.originalEvent;
+
+		this.isDefaultPrevented = returnTrue;
+
+		if ( e && e.preventDefault ) {
+			e.preventDefault();
+		}
+	},
+	stopPropagation: function() {
+		var e = this.originalEvent;
+
+		this.isPropagationStopped = returnTrue;
+
+		if ( e && e.stopPropagation ) {
+			e.stopPropagation();
+		}
+	},
+	stopImmediatePropagation: function() {
+		var e = this.originalEvent;
+
+		this.isImmediatePropagationStopped = returnTrue;
+
+		if ( e && e.stopImmediatePropagation ) {
+			e.stopImmediatePropagation();
+		}
+
+		this.stopPropagation();
+	}
+};
+
+// Create mouseenter/leave events using mouseover/out and event-time checks
+// Support: Chrome 15+
+jQuery.each({
+	mouseenter: "mouseover",
+	mouseleave: "mouseout",
+	pointerenter: "pointerover",
+	pointerleave: "pointerout"
+}, function( orig, fix ) {
+	jQuery.event.special[ orig ] = {
+		delegateType: fix,
+		bindType: fix,
+
+		handle: function( event ) {
+			var ret,
+				target = this,
+				related = event.relatedTarget,
+				handleObj = event.handleObj;
+
+			// For mousenter/leave call the handler if related is outside the target.
+			// NB: No relatedTarget if the mouse left/entered the browser window
+			if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
+				event.type = handleObj.origType;
+				ret = handleObj.handler.apply( this, arguments );
+				event.type = fix;
+			}
+			return ret;
+		}
+	};
+});
+
+// Create "bubbling" focus and blur events
+// Support: Firefox, Chrome, Safari
+if ( !support.focusinBubbles ) {
+	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {
+
+		// Attach a single capturing handler on the document while someone wants focusin/focusout
+		var handler = function( event ) {
+				jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
+			};
+
+		jQuery.event.special[ fix ] = {
+			setup: function() {
+				var doc = this.ownerDocument || this,
+					attaches = data_priv.access( doc, fix );
+
+				if ( !attaches ) {
+					doc.addEventListener( orig, handler, true );
+				}
+				data_priv.access( doc, fix, ( attaches || 0 ) + 1 );
+			},
+			teardown: function() {
+				var doc = this.ownerDocument || this,
+					attaches = data_priv.access( doc, fix ) - 1;
+
+				if ( !attaches ) {
+					doc.removeEventListener( orig, handler, true );
+					data_priv.remove( doc, fix );
+
+				} else {
+					data_priv.access( doc, fix, attaches );
+				}
+			}
+		};
+	});
+}
+
+jQuery.fn.extend({
+
+	on: function( types, selector, data, fn, /*INTERNAL*/ one ) {
+		var origFn, type;
+
+		// Types can be a map of types/handlers
+		if ( typeof types === "object" ) {
+			// ( types-Object, selector, data )
+			if ( typeof selector !== "string" ) {
+				// ( types-Object, data )
+				data = data || selector;
+				selector = undefined;
+			}
+			for ( type in types ) {
+				this.on( type, selector, data, types[ type ], one );
+			}
+			return this;
+		}
+
+		if ( data == null && fn == null ) {
+			// ( types, fn )
+			fn = selector;
+			data = selector = undefined;
+		} else if ( fn == null ) {
+			if ( typeof selector === "string" ) {
+				// ( types, selector, fn )
+				fn = data;
+				data = undefined;
+			} else {
+				// ( types, data, fn )
+				fn = data;
+				data = selector;
+				selector = undefined;
+			}
+		}
+		if ( fn === false ) {
+			fn = returnFalse;
+		} else if ( !fn ) {
+			return this;
+		}
+
+		if ( one === 1 ) {
+			origFn = fn;
+			fn = function( event ) {
+				// Can use an empty set, since event contains the info
+				jQuery().off( event );
+				return origFn.apply( this, arguments );
+			};
+			// Use same guid so caller can remove using origFn
+			fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
+		}
+		return this.each( function() {
+			jQuery.event.add( this, types, fn, data, selector );
+		});
+	},
+	one: function( types, selector, data, fn ) {
+		return this.on( types, selector, data, fn, 1 );
+	},
+	off: function( types, selector, fn ) {
+		var handleObj, type;
+		if ( types && types.preventDefault && types.handleObj ) {
+			// ( event )  dispatched jQuery.Event
+			handleObj = types.handleObj;
+			jQuery( types.delegateTarget ).off(
+				handleObj.namespace ? handleObj.origType + "." + handleObj.namespace : handleObj.origType,
+				handleObj.selector,
+				handleObj.handler
+			);
+			return this;
+		}
+		if ( typeof types === "object" ) {
+			// ( types-object [, selector] )
+			for ( type in types ) {
+				this.off( type, selector, types[ type ] );
+			}
+			return this;
+		}
+		if ( selector === false || typeof selector === "function" ) {
+			// ( types [, fn] )
+			fn = selector;
+			selector = undefined;
+		}
+		if ( fn === false ) {
+			fn = returnFalse;
+		}
+		return this.each(function() {
+			jQuery.event.remove( this, types, fn, selector );
+		});
+	},
+
+	trigger: function( type, data ) {
+		return this.each(function() {
+			jQuery.event.trigger( type, data, this );
+		});
+	},
+	triggerHandler: function( type, data ) {
+		var elem = this[0];
+		if ( elem ) {
+			return jQuery.event.trigger( type, data, elem, true );
+		}
+	}
+});
+
+
+var
+	rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
+	rtagName = /<([\w:]+)/,
+	rhtml = /<|&#?\w+;/,
+	rnoInnerhtml = /<(?:script|style|link)/i,
+	// checked="checked" or checked
+	rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
+	rscriptType = /^$|\/(?:java|ecma)script/i,
+	rscriptTypeMasked = /^true\/(.*)/,
+	rcleanScript = /^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g,
+
+	// We have to close these tags to support XHTML (#13200)
+	wrapMap = {
+
+		// Support: IE 9
+		option: [ 1, "<select multiple='multiple'>", "</select>" ],
+
+		thead: [ 1, "<table>", "</table>" ],
+		col: [ 2, "<table><colgroup>", "</colgroup></table>" ],
+		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
+		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],
+
+		_default: [ 0, "", "" ]
+	};
+
+// Support: IE 9
+wrapMap.optgroup = wrapMap.option;
+
+wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
+wrapMap.th = wrapMap.td;
+
+// Support: 1.x compatibility
+// Manipulating tables requires a tbody
+function manipulationTarget( elem, content ) {
+	return jQuery.nodeName( elem, "table" ) &&
+		jQuery.nodeName( content.nodeType !== 11 ? content : content.firstChild, "tr" ) ?
+
+		elem.getElementsByTagName("tbody")[0] ||
+			elem.appendChild( elem.ownerDocument.createElement("tbody") ) :
+		elem;
+}
+
+// Replace/restore the type attribute of script elements for safe DOM manipulation
+function disableScript( elem ) {
+	elem.type = (elem.getAttribute("type") !== null) + "/" + elem.type;
+	return elem;
+}
+function restoreScript( elem ) {
+	var match = rscriptTypeMasked.exec( elem.type );
+
+	if ( match ) {
+		elem.type = match[ 1 ];
+	} else {
+		elem.removeAttribute("type");
+	}
+
+	return elem;
+}
+
+// Mark scripts as having already been evaluated
+function setGlobalEval( elems, refElements ) {
+	var i = 0,
+		l = elems.length;
+
+	for ( ; i < l; i++ ) {
+		data_priv.set(
+			elems[ i ], "globalEval", !refElements || data_priv.get( refElements[ i ], "globalEval" )
+		);
+	}
+}
+
+function cloneCopyEvent( src, dest ) {
+	var i, l, type, pdataOld, pdataCur, udataOld, udataCur, events;
+
+	if ( dest.nodeType !== 1 ) {
+		return;
+	}
+
+	// 1. Copy private data: events, handlers, etc.
+	if ( data_priv.hasData( src ) ) {
+		pdataOld = data_priv.access( src );
+		pdataCur = data_priv.set( dest, pdataOld );
+		events = pdataOld.events;
+
+		if ( events ) {
+			delete pdataCur.handle;
+			pdataCur.events = {};
+
+			for ( type in events ) {
+				for ( i = 0, l = events[ type ].length; i < l; i++ ) {
+					jQuery.event.add( dest, type, events[ type ][ i ] );
+				}
+			}
+		}
+	}
+
+	// 2. Copy user data
+	if ( data_user.hasData( src ) ) {
+		udataOld = data_user.access( src );
+		udataCur = jQuery.extend( {}, udataOld );
+
+		data_user.set( dest, udataCur );
+	}
+}
+
+function getAll( context, tag ) {
+	var ret = context.getElementsByTagName ? context.getElementsByTagName( tag || "*" ) :
+			context.querySelectorAll ? context.querySelectorAll( tag || "*" ) :
+			[];
+
+	return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
+		jQuery.merge( [ context ], ret ) :
+		ret;
+}
+
+// Support: IE >= 9
+function fixInput( src, dest ) {
+	var nodeName = dest.nodeName.toLowerCase();
+
+	// Fails to persist the checked state of a cloned checkbox or radio button.
+	if ( nodeName === "input" && rcheckableType.test( src.type ) ) {
+		dest.checked = src.checked;
+
+	// Fails to return the selected option to the default selected state when cloning options
+	} else if ( nodeName === "input" || nodeName === "textarea" ) {
+		dest.defaultValue = src.defaultValue;
+	}
+}
+
+jQuery.extend({
+	clone: function( elem, dataAndEvents, deepDataAndEvents ) {
+		var i, l, srcElements, destElements,
+			clone = elem.cloneNode( true ),
+			inPage = jQuery.contains( elem.ownerDocument, elem );
+
+		// Support: IE >= 9
+		// Fix Cloning issues
+		if ( !support.noCloneChecked && ( elem.nodeType === 1 || elem.nodeType === 11 ) &&
+				!jQuery.isXMLDoc( elem ) ) {
+
+			// We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
+			destElements = getAll( clone );
+			srcElements = getAll( elem );
+
+			for ( i = 0, l = srcElements.length; i < l; i++ ) {
+				fixInput( srcElements[ i ], destElements[ i ] );
+			}
+		}
+
+		// Copy the events from the original to the clone
+		if ( dataAndEvents ) {
+			if ( deepDataAndEvents ) {
+				srcElements = srcElements || getAll( elem );
+				destElements = destElements || getAll( clone );
+
+				for ( i = 0, l = srcElements.length; i < l; i++ ) {
+					cloneCopyEvent( srcElements[ i ], destElements[ i ] );
+				}
+			} else {
+				cloneCopyEvent( elem, clone );
+			}
+		}
+
+		// Preserve script evaluation history
+		destElements = getAll( clone, "script" );
+		if ( destElements.length > 0 ) {
+			setGlobalEval( destElements, !inPage && getAll( elem, "script" ) );
+		}
+
+		// Return the cloned set
+		return clone;
+	},
+
+	buildFragment: function( elems, context, scripts, selection ) {
+		var elem, tmp, tag, wrap, contains, j,
+			fragment = context.createDocumentFragment(),
+			nodes = [],
+			i = 0,
+			l = elems.length;
+
+		for ( ; i < l; i++ ) {
+			elem = elems[ i ];
+
+			if ( elem || elem === 0 ) {
+
+				// Add nodes directly
+				if ( jQuery.type( elem ) === "object" ) {
+					// Support: QtWebKit
+					// jQuery.merge because push.apply(_, arraylike) throws
+					jQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );
+
+				// Convert non-html into a text node
+				} else if ( !rhtml.test( elem ) ) {
+					nodes.push( context.createTextNode( elem ) );
+
+				// Convert html into DOM nodes
+				} else {
+					tmp = tmp || fragment.appendChild( context.createElement("div") );
+
+					// Deserialize a standard representation
+					tag = ( rtagName.exec( elem ) || [ "", "" ] )[ 1 ].toLowerCase();
+					wrap = wrapMap[ tag ] || wrapMap._default;
+					tmp.innerHTML = wrap[ 1 ] + elem.replace( rxhtmlTag, "<$1></$2>" ) + wrap[ 2 ];
+
+					// Descend through wrappers to the right content
+					j = wrap[ 0 ];
+					while ( j-- ) {
+						tmp = tmp.lastChild;
+					}
+
+					// Support: QtWebKit
+					// jQuery.merge because push.apply(_, arraylike) throws
+					jQuery.merge( nodes, tmp.childNodes );
+
+					// Remember the top-level container
+					tmp = fragment.firstChild;
+
+					// Fixes #12346
+					// Support: Webkit, IE
+					tmp.textContent = "";
+				}
+			}
+		}
+
+		// Remove wrapper from fragment
+		fragment.textContent = "";
+
+		i = 0;
+		while ( (elem = nodes[ i++ ]) ) {
+
+			// #4087 - If origin and destination elements are the same, and this is
+			// that element, do not do anything
+			if ( selection && jQuery.inArray( elem, selection ) !== -1 ) {
+				continue;
+			}
+
+			contains = jQuery.contains( elem.ownerDocument, elem );
+
+			// Append to fragment
+			tmp = getAll( fragment.appendChild( elem ), "script" );
+
+			// Preserve script evaluation history
+			if ( contains ) {
+				setGlobalEval( tmp );
+			}
+
+			// Capture executables
+			if ( scripts ) {
+				j = 0;
+				while ( (elem = tmp[ j++ ]) ) {
+					if ( rscriptType.test( elem.type || "" ) ) {
+						scripts.push( elem );
+					}
+				}
+			}
+		}
+
+		return fragment;
+	},
+
+	cleanData: function( elems ) {
+		var data, elem, type, key,
+			special = jQuery.event.special,
+			i = 0;
+
+		for ( ; (elem = elems[ i ]) !== undefined; i++ ) {
+			if ( jQuery.acceptData( elem ) ) {
+				key = elem[ data_priv.expando ];
+
+				if ( key && (data = data_priv.cache[ key ]) ) {
+					if ( data.events ) {
+						for ( type in data.events ) {
+							if ( special[ type ] ) {
+								jQuery.event.remove( elem, type );
+
+							// This is a shortcut to avoid jQuery.event.remove's overhead
+							} else {
+								jQuery.removeEvent( elem, type, data.handle );
+							}
+						}
+					}
+					if ( data_priv.cache[ key ] ) {
+						// Discard any remaining `private` data
+						delete data_priv.cache[ key ];
+					}
+				}
+			}
+			// Discard any remaining `user` data
+			delete data_user.cache[ elem[ data_user.expando ] ];
+		}
+	}
+});
+
+jQuery.fn.extend({
+	text: function( value ) {
+		return access( this, function( value ) {
+			return value === undefined ?
+				jQuery.text( this ) :
+				this.empty().each(function() {
+					if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
+						this.textContent = value;
+					}
+				});
+		}, null, value, arguments.length );
+	},
+
+	append: function() {
+		return this.domManip( arguments, function( elem ) {
+			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
+				var target = manipulationTarget( this, elem );
+				target.appendChild( elem );
+			}
+		});
+	},
+
+	prepend: function() {
+		return this.domManip( arguments, function( elem ) {
+			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
+				var target = manipulationTarget( this, elem );
+				target.insertBefore( elem, target.firstChild );
+			}
+		});
+	},
+
+	before: function() {
+		return this.domManip( arguments, function( elem ) {
+			if ( this.parentNode ) {
+				this.parentNode.insertBefore( elem, this );
+			}
+		});
+	},
+
+	after: function() {
+		return this.domManip( arguments, function( elem ) {
+			if ( this.parentNode ) {
+				this.parentNode.insertBefore( elem, this.nextSibling );
+			}
+		});
+	},
+
+	remove: function( selector, keepData /* Internal Use Only */ ) {
+		var elem,
+			elems = selector ? jQuery.filter( selector, this ) : this,
+			i = 0;
+
+		for ( ; (elem = elems[i]) != null; i++ ) {
+			if ( !keepData && elem.nodeType === 1 ) {
+				jQuery.cleanData( getAll( elem ) );
+			}
+
+			if ( elem.parentNode ) {
+				if ( keepData && jQuery.contains( elem.ownerDocument, elem ) ) {
+					setGlobalEval( getAll( elem, "script" ) );
+				}
+				elem.parentNode.removeChild( elem );
+			}
+		}
+
+		return this;
+	},
+
+	empty: function() {
+		var elem,
+			i = 0;
+
+		for ( ; (elem = this[i]) != null; i++ ) {
+			if ( elem.nodeType === 1 ) {
+
+				// Prevent memory leaks
+				jQuery.cleanData( getAll( elem, false ) );
+
+				// Remove any remaining nodes
+				elem.textContent = "";
+			}
+		}
+
+		return this;
+	},
+
+	clone: function( dataAndEvents, deepDataAndEvents ) {
+		dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
+		deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;
+
+		return this.map(function() {
+			return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
+		});
+	},
+
+	html: function( value ) {
+		return access( this, function( value ) {
+			var elem = this[ 0 ] || {},
+				i = 0,
+				l = this.length;
+
+			if ( value === undefined && elem.nodeType === 1 ) {
+				return elem.innerHTML;
+			}
+
+			// See if we can take a shortcut and just use innerHTML
+			if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
+				!wrapMap[ ( rtagName.exec( value ) || [ "", "" ] )[ 1 ].toLowerCase() ] ) {
+
+				value = value.replace( rxhtmlTag, "<$1></$2>" );
+
+				try {
+					for ( ; i < l; i++ ) {
+						elem = this[ i ] || {};
+
+						// Remove element nodes and prevent memory leaks
+						if ( elem.nodeType === 1 ) {
+							jQuery.cleanData( getAll( elem, false ) );
+							elem.innerHTML = value;
+						}
+					}
+
+					elem = 0;
+
+				// If using innerHTML throws an exception, use the fallback method
+				} catch( e ) {}
+			}
+
+			if ( elem ) {
+				this.empty().append( value );
+			}
+		}, null, value, arguments.length );
+	},
+
+	replaceWith: function() {
+		var arg = arguments[ 0 ];
+
+		// Make the changes, replacing each context element with the new content
+		this.domManip( arguments, function( elem ) {
+			arg = this.parentNode;
+
+			jQuery.cleanData( getAll( this ) );
+
+			if ( arg ) {
+				arg.replaceChild( elem, this );
+			}
+		});
+
+		// Force removal if there was no new content (e.g., from empty arguments)
+		return arg && (arg.length || arg.nodeType) ? this : this.remove();
+	},
+
+	detach: function( selector ) {
+		return this.remove( selector, true );
+	},
+
+	domManip: function( args, callback ) {
+
+		// Flatten any nested arrays
+		args = concat.apply( [], args );
+
+		var fragment, first, scripts, hasScripts, node, doc,
+			i = 0,
+			l = this.length,
+			set = this,
+			iNoClone = l - 1,
+			value = args[ 0 ],
+			isFunction = jQuery.isFunction( value );
+
+		// We can't cloneNode fragments that contain checked, in WebKit
+		if ( isFunction ||
+				( l > 1 && typeof value === "string" &&
+					!support.checkClone && rchecked.test( value ) ) ) {
+			return this.each(function( index ) {
+				var self = set.eq( index );
+				if ( isFunction ) {
+					args[ 0 ] = value.call( this, index, self.html() );
+				}
+				self.domManip( args, callback );
+			});
+		}
+
+		if ( l ) {
+			fragment = jQuery.buildFragment( args, this[ 0 ].ownerDocument, false, this );
+			first = fragment.firstChild;
+
+			if ( fragment.childNodes.length === 1 ) {
+				fragment = first;
+			}
+
+			if ( first ) {
+				scripts = jQuery.map( getAll( fragment, "script" ), disableScript );
+				hasScripts = scripts.length;
+
+				// Use the original fragment for the last item instead of the first because it can end up
+				// being emptied incorrectly in certain situations (#8070).
+				for ( ; i < l; i++ ) {
+					node = fragment;
+
+					if ( i !== iNoClone ) {
+						node = jQuery.clone( node, true, true );
+
+						// Keep references to cloned scripts for later restoration
+						if ( hasScripts ) {
+							// Support: QtWebKit
+							// jQuery.merge because push.apply(_, arraylike) throws
+							jQuery.merge( scripts, getAll( node, "script" ) );
+						}
+					}
+
+					callback.call( this[ i ], node, i );
+				}
+
+				if ( hasScripts ) {
+					doc = scripts[ scripts.length - 1 ].ownerDocument;
+
+					// Reenable scripts
+					jQuery.map( scripts, restoreScript );
+
+					// Evaluate executable scripts on first document insertion
+					for ( i = 0; i < hasScripts; i++ ) {
+						node = scripts[ i ];
+						if ( rscriptType.test( node.type || "" ) &&
+							!data_priv.access( node, "globalEval" ) && jQuery.contains( doc, node ) ) {
+
+							if ( node.src ) {
+								// Optional AJAX dependency, but won't run scripts if not present
+								if ( jQuery._evalUrl ) {
+									jQuery._evalUrl( node.src );
+								}
+							} else {
+								jQuery.globalEval( node.textContent.replace( rcleanScript, "" ) );
+							}
+						}
+					}
+				}
+			}
+		}
+
+		return this;
+	}
+});
+
+jQuery.each({
+	appendTo: "append",
+	prependTo: "prepend",
+	insertBefore: "before",
+	insertAfter: "after",
+	replaceAll: "replaceWith"
+}, function( name, original ) {
+	jQuery.fn[ name ] = function( selector ) {
+		var elems,
+			ret = [],
+			insert = jQuery( selector ),
+			last = insert.length - 1,
+			i = 0;
+
+		for ( ; i <= last; i++ ) {
+			elems = i === last ? this : this.clone( true );
+			jQuery( insert[ i ] )[ original ]( elems );
+
+			// Support: QtWebKit
+			// .get() because push.apply(_, arraylike) throws
+			push.apply( ret, elems.get() );
+		}
+
+		return this.pushStack( ret );
+	};
+});
+
+
+var iframe,
+	elemdisplay = {};
+
+/**
+ * Retrieve the actual display of a element
+ * @param {String} name nodeName of the element
+ * @param {Object} doc Document object
+ */
+// Called only from within defaultDisplay
+function actualDisplay( name, doc ) {
+	var style,
+		elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),
+
+		// getDefaultComputedStyle might be reliably used only on attached element
+		display = window.getDefaultComputedStyle && ( style = window.getDefaultComputedStyle( elem[ 0 ] ) ) ?
+
+			// Use of this method is a temporary fix (more like optmization) until something better comes along,
+			// since it was removed from specification and supported only in FF
+			style.display : jQuery.css( elem[ 0 ], "display" );
+
+	// We don't have any data stored on the element,
+	// so use "detach" method as fast way to get rid of the element
+	elem.detach();
+
+	return display;
+}
+
+/**
+ * Try to determine the default display value of an element
+ * @param {String} nodeName
+ */
+function defaultDisplay( nodeName ) {
+	var doc = document,
+		display = elemdisplay[ nodeName ];
+
+	if ( !display ) {
+		display = actualDisplay( nodeName, doc );
+
+		// If the simple way fails, read from inside an iframe
+		if ( display === "none" || !display ) {
+
+			// Use the already-created iframe if possible
+			iframe = (iframe || jQuery( "<iframe frameborder='0' width='0' height='0'/>" )).appendTo( doc.documentElement );
+
+			// Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
+			doc = iframe[ 0 ].contentDocument;
+
+			// Support: IE
+			doc.write();
+			doc.close();
+
+			display = actualDisplay( nodeName, doc );
+			iframe.detach();
+		}
+
+		// Store the correct default display
+		elemdisplay[ nodeName ] = display;
+	}
+
+	return display;
+}
+var rmargin = (/^margin/);
+
+var rnumnonpx = new RegExp( "^(" + pnum + ")(?!px)[a-z%]+$", "i" );
+
+var getStyles = function( elem ) {
+		return elem.ownerDocument.defaultView.getComputedStyle( elem, null );
+	};
+
+
+
+function curCSS( elem, name, computed ) {
+	var width, minWidth, maxWidth, ret,
+		style = elem.style;
+
+	computed = computed || getStyles( elem );
+
+	// Support: IE9
+	// getPropertyValue is only needed for .css('filter') in IE9, see #12537
+	if ( computed ) {
+		ret = computed.getPropertyValue( name ) || computed[ name ];
+	}
+
+	if ( computed ) {
+
+		if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
+			ret = jQuery.style( elem, name );
+		}
+
+		// Support: iOS < 6
+		// A tribute to the "awesome hack by Dean Edwards"
+		// iOS < 6 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels
+		// this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
+		if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {
+
+			// Remember the original values
+			width = style.width;
+			minWidth = style.minWidth;
+			maxWidth = style.maxWidth;
+
+			// Put in the new values to get a computed value out
+			style.minWidth = style.maxWidth = style.width = ret;
+			ret = computed.width;
+
+			// Revert the changed values
+			style.width = width;
+			style.minWidth = minWidth;
+			style.maxWidth = maxWidth;
+		}
+	}
+
+	return ret !== undefined ?
+		// Support: IE
+		// IE returns zIndex value as an integer.
+		ret + "" :
+		ret;
+}
+
+
+function addGetHookIf( conditionFn, hookFn ) {
+	// Define the hook, we'll check on the first run if it's really needed.
+	return {
+		get: function() {
+			if ( conditionFn() ) {
+				// Hook not needed (or it's not possible to use it due to missing dependency),
+				// remove it.
+				// Since there are no other hooks for marginRight, remove the whole object.
+				delete this.get;
+				return;
+			}
+
+			// Hook needed; redefine it so that the support test is not executed again.
+
+			return (this.get = hookFn).apply( this, arguments );
+		}
+	};
+}
+
+
+(function() {
+	var pixelPositionVal, boxSizingReliableVal,
+		docElem = document.documentElement,
+		container = document.createElement( "div" ),
+		div = document.createElement( "div" );
+
+	if ( !div.style ) {
+		return;
+	}
+
+	div.style.backgroundClip = "content-box";
+	div.cloneNode( true ).style.backgroundClip = "";
+	support.clearCloneStyle = div.style.backgroundClip === "content-box";
+
+	container.style.cssText = "border:0;width:0;height:0;top:0;left:-9999px;margin-top:1px;" +
+		"position:absolute";
+	container.appendChild( div );
+
+	// Executing both pixelPosition & boxSizingReliable tests require only one layout
+	// so they're executed at the same time to save the second computation.
+	function computePixelPositionAndBoxSizingReliable() {
+		div.style.cssText =
+			// Support: Firefox<29, Android 2.3
+			// Vendor-prefix box-sizing
+			"-webkit-box-sizing:border-box;-moz-box-sizing:border-box;" +
+			"box-sizing:border-box;display:block;margin-top:1%;top:1%;" +
+			"border:1px;padding:1px;width:4px;position:absolute";
+		div.innerHTML = "";
+		docElem.appendChild( container );
+
+		var divStyle = window.getComputedStyle( div, null );
+		pixelPositionVal = divStyle.top !== "1%";
+		boxSizingReliableVal = divStyle.width === "4px";
+
+		docElem.removeChild( container );
+	}
+
+	// Support: node.js jsdom
+	// Don't assume that getComputedStyle is a property of the global object
+	if ( window.getComputedStyle ) {
+		jQuery.extend( support, {
+			pixelPosition: function() {
+				// This test is executed only once but we still do memoizing
+				// since we can use the boxSizingReliable pre-computing.
+				// No need to check if the test was already performed, though.
+				computePixelPositionAndBoxSizingReliable();
+				return pixelPositionVal;
+			},
+			boxSizingReliable: function() {
+				if ( boxSizingReliableVal == null ) {
+					computePixelPositionAndBoxSizingReliable();
+				}
+				return boxSizingReliableVal;
+			},
+			reliableMarginRight: function() {
+				// Support: Android 2.3
+				// Check if div with explicit width and no margin-right incorrectly
+				// gets computed margin-right based on width of container. (#3333)
+				// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
+				// This support function is only executed once so no memoizing is needed.
+				var ret,
+					marginDiv = div.appendChild( document.createElement( "div" ) );
+
+				// Reset CSS: box-sizing; display; margin; border; padding
+				marginDiv.style.cssText = div.style.cssText =
+					// Support: Firefox<29, Android 2.3
+					// Vendor-prefix box-sizing
+					"-webkit-box-sizing:content-box;-moz-box-sizing:content-box;" +
+					"box-sizing:content-box;display:block;margin:0;border:0;padding:0";
+				marginDiv.style.marginRight = marginDiv.style.width = "0";
+				div.style.width = "1px";
+				docElem.appendChild( container );
+
+				ret = !parseFloat( window.getComputedStyle( marginDiv, null ).marginRight );
+
+				docElem.removeChild( container );
+
+				return ret;
+			}
+		});
+	}
+})();
+
+
+// A method for quickly swapping in/out CSS properties to get correct calculations.
+jQuery.swap = function( elem, options, callback, args ) {
+	var ret, name,
+		old = {};
+
+	// Remember the old values, and insert the new ones
+	for ( name in options ) {
+		old[ name ] = elem.style[ name ];
+		elem.style[ name ] = options[ name ];
+	}
+
+	ret = callback.apply( elem, args || [] );
+
+	// Revert the old values
+	for ( name in options ) {
+		elem.style[ name ] = old[ name ];
+	}
+
+	return ret;
+};
+
+
+var
+	// swappable if display is none or starts with table except "table", "table-cell", or "table-caption"
+	// see here for display values: https://developer.mozilla.org/en-US/docs/CSS/display
+	rdisplayswap = /^(none|table(?!-c[ea]).+)/,
+	rnumsplit = new RegExp( "^(" + pnum + ")(.*)$", "i" ),
+	rrelNum = new RegExp( "^([+-])=(" + pnum + ")", "i" ),
+
+	cssShow = { position: "absolute", visibility: "hidden", display: "block" },
+	cssNormalTransform = {
+		letterSpacing: "0",
+		fontWeight: "400"
+	},
+
+	cssPrefixes = [ "Webkit", "O", "Moz", "ms" ];
+
+// return a css property mapped to a potentially vendor prefixed property
+function vendorPropName( style, name ) {
+
+	// shortcut for names that are not vendor prefixed
+	if ( name in style ) {
+		return name;
+	}
+
+	// check for vendor prefixed names
+	var capName = name[0].toUpperCase() + name.slice(1),
+		origName = name,
+		i = cssPrefixes.length;
+
+	while ( i-- ) {
+		name = cssPrefixes[ i ] + capName;
+		if ( name in style ) {
+			return name;
+		}
+	}
+
+	return origName;
+}
+
+function setPositiveNumber( elem, value, subtract ) {
+	var matches = rnumsplit.exec( value );
+	return matches ?
+		// Guard against undefined "subtract", e.g., when used as in cssHooks
+		Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
+		value;
+}
+
+function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
+	var i = extra === ( isBorderBox ? "border" : "content" ) ?
+		// If we already have the right measurement, avoid augmentation
+		4 :
+		// Otherwise initialize for horizontal or vertical properties
+		name === "width" ? 1 : 0,
+
+		val = 0;
+
+	for ( ; i < 4; i += 2 ) {
+		// both box models exclude margin, so add it if we want it
+		if ( extra === "margin" ) {
+			val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
+		}
+
+		if ( isBorderBox ) {
+			// border-box includes padding, so remove it if we want content
+			if ( extra === "content" ) {
+				val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
+			}
+
+			// at this point, extra isn't border nor margin, so remove border
+			if ( extra !== "margin" ) {
+				val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
+			}
+		} else {
+			// at this point, extra isn't content, so add padding
+			val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
+
+			// at this point, extra isn't content nor padding, so add border
+			if ( extra !== "padding" ) {
+				val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
+			}
+		}
+	}
+
+	return val;
+}
+
+function getWidthOrHeight( elem, name, extra ) {
+
+	// Start with offset property, which is equivalent to the border-box value
+	var valueIsBorderBox = true,
+		val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
+		styles = getStyles( elem ),
+		isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box";
+
+	// some non-html elements return undefined for offsetWidth, so check for null/undefined
+	// svg - https://bugzilla.mozilla.org/show_bug.cgi?id=649285
+	// MathML - https://bugzilla.mozilla.org/show_bug.cgi?id=491668
+	if ( val <= 0 || val == null ) {
+		// Fall back to computed then uncomputed css if necessary
+		val = curCSS( elem, name, styles );
+		if ( val < 0 || val == null ) {
+			val = elem.style[ name ];
+		}
+
+		// Computed unit is not pixels. Stop here and return.
+		if ( rnumnonpx.test(val) ) {
+			return val;
+		}
+
+		// we need the check for style in case a browser which returns unreliable values
+		// for getComputedStyle silently falls back to the reliable elem.style
+		valueIsBorderBox = isBorderBox &&
+			( support.boxSizingReliable() || val === elem.style[ name ] );
+
+		// Normalize "", auto, and prepare for extra
+		val = parseFloat( val ) || 0;
+	}
+
+	// use the active box-sizing model to add/subtract irrelevant styles
+	return ( val +
+		augmentWidthOrHeight(
+			elem,
+			name,
+			extra || ( isBorderBox ? "border" : "content" ),
+			valueIsBorderBox,
+			styles
+		)
+	) + "px";
+}
+
+function showHide( elements, show ) {
+	var display, elem, hidden,
+		values = [],
+		index = 0,
+		length = elements.length;
+
+	for ( ; index < length; index++ ) {
+		elem = elements[ index ];
+		if ( !elem.style ) {
+			continue;
+		}
+
+		values[ index ] = data_priv.get( elem, "olddisplay" );
+		display = elem.style.display;
+		if ( show ) {
+			// Reset the inline display of this element to learn if it is
+			// being hidden by cascaded rules or not
+			if ( !values[ index ] && display === "none" ) {
+				elem.style.display = "";
+			}
+
+			// Set elements which have been overridden with display: none
+			// in a stylesheet to whatever the default browser style is
+			// for such an element
+			if ( elem.style.display === "" && isHidden( elem ) ) {
+				values[ index ] = data_priv.access( elem, "olddisplay", defaultDisplay(elem.nodeName) );
+			}
+		} else {
+			hidden = isHidden( elem );
+
+			if ( display !== "none" || !hidden ) {
+				data_priv.set( elem, "olddisplay", hidden ? display : jQuery.css( elem, "display" ) );
+			}
+		}
+	}
+
+	// Set the display of most of the elements in a second loop
+	// to avoid the constant reflow
+	for ( index = 0; index < length; index++ ) {
+		elem = elements[ index ];
+		if ( !elem.style ) {
+			continue;
+		}
+		if ( !show || elem.style.display === "none" || elem.style.display === "" ) {
+			elem.style.display = show ? values[ index ] || "" : "none";
+		}
+	}
+
+	return elements;
+}
+
+jQuery.extend({
+	// Add in style property hooks for overriding the default
+	// behavior of getting and setting a style property
+	cssHooks: {
+		opacity: {
+			get: function( elem, computed ) {
+				if ( computed ) {
+					// We should always get a number back from opacity
+					var ret = curCSS( elem, "opacity" );
+					return ret === "" ? "1" : ret;
+				}
+			}
+		}
+	},
+
+	// Don't automatically add "px" to these possibly-unitless properties
+	cssNumber: {
+		"columnCount": true,
+		"fillOpacity": true,
+		"flexGrow": true,
+		"flexShrink": true,
+		"fontWeight": true,
+		"lineHeight": true,
+		"opacity": true,
+		"order": true,
+		"orphans": true,
+		"widows": true,
+		"zIndex": true,
+		"zoom": true
+	},
+
+	// Add in properties whose names you wish to fix before
+	// setting or getting the value
+	cssProps: {
+		// normalize float css property
+		"float": "cssFloat"
+	},
+
+	// Get and set the style property on a DOM Node
+	style: function( elem, name, value, extra ) {
+		// Don't set styles on text and comment nodes
+		if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
+			return;
+		}
+
+		// Make sure that we're working with the right name
+		var ret, type, hooks,
+			origName = jQuery.camelCase( name ),
+			style = elem.style;
+
+		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );
+
+		// gets hook for the prefixed version
+		// followed by the unprefixed version
+		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
+
+		// Check if we're setting a value
+		if ( value !== undefined ) {
+			type = typeof value;
+
+			// convert relative number strings (+= or -=) to relative numbers. #7345
+			if ( type === "string" && (ret = rrelNum.exec( value )) ) {
+				value = ( ret[1] + 1 ) * ret[2] + parseFloat( jQuery.css( elem, name ) );
+				// Fixes bug #9237
+				type = "number";
+			}
+
+			// Make sure that null and NaN values aren't set. See: #7116
+			if ( value == null || value !== value ) {
+				return;
+			}
+
+			// If a number was passed in, add 'px' to the (except for certain CSS properties)
+			if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
+				value += "px";
+			}
+
+			// Fixes #8908, it can be done more correctly by specifying setters in cssHooks,
+			// but it would mean to define eight (for every problematic property) identical functions
+			if ( !support.clearCloneStyle && value === "" && name.indexOf( "background" ) === 0 ) {
+				style[ name ] = "inherit";
+			}
+
+			// If a hook was provided, use that value, otherwise just set the specified value
+			if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {
+				style[ name ] = value;
+			}
+
+		} else {
+			// If a hook was provided get the non-computed value from there
+			if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
+				return ret;
+			}
+
+			// Otherwise just get the value from the style object
+			return style[ name ];
+		}
+	},
+
+	css: function( elem, name, extra, styles ) {
+		var val, num, hooks,
+			origName = jQuery.camelCase( name );
+
+		// Make sure that we're working with the right name
+		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );
+
+		// gets hook for the prefixed version
+		// followed by the unprefixed version
+		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
+
+		// If a hook was provided get the computed value from there
+		if ( hooks && "get" in hooks ) {
+			val = hooks.get( elem, true, extra );
+		}
+
+		// Otherwise, if a way to get the computed value exists, use that
+		if ( val === undefined ) {
+			val = curCSS( elem, name, styles );
+		}
+
+		//convert "normal" to computed value
+		if ( val === "normal" && name in cssNormalTransform ) {
+			val = cssNormalTransform[ name ];
+		}
+
+		// Return, converting to number if forced or a qualifier was provided and val looks numeric
+		if ( extra === "" || extra ) {
+			num = parseFloat( val );
+			return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
+		}
+		return val;
+	}
+});
+
+jQuery.each([ "height", "width" ], function( i, name ) {
+	jQuery.cssHooks[ name ] = {
+		get: function( elem, computed, extra ) {
+			if ( computed ) {
+				// certain elements can have dimension info if we invisibly show them
+				// however, it must have a current display style that would benefit from this
+				return rdisplayswap.test( jQuery.css( elem, "display" ) ) && elem.offsetWidth === 0 ?
+					jQuery.swap( elem, cssShow, function() {
+						return getWidthOrHeight( elem, name, extra );
+					}) :
+					getWidthOrHeight( elem, name, extra );
+			}
+		},
+
+		set: function( elem, value, extra ) {
+			var styles = extra && getStyles( elem );
+			return setPositiveNumber( elem, value, extra ?
+				augmentWidthOrHeight(
+					elem,
+					name,
+					extra,
+					jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
+					styles
+				) : 0
+			);
+		}
+	};
+});
+
+// Support: Android 2.3
+jQuery.cssHooks.marginRight = addGetHookIf( support.reliableMarginRight,
+	function( elem, computed ) {
+		if ( computed ) {
+			// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
+			// Work around by temporarily setting element display to inline-block
+			return jQuery.swap( elem, { "display": "inline-block" },
+				curCSS, [ elem, "marginRight" ] );
+		}
+	}
+);
+
+// These hooks are used by animate to expand properties
+jQuery.each({
+	margin: "",
+	padding: "",
+	border: "Width"
+}, function( prefix, suffix ) {
+	jQuery.cssHooks[ prefix + suffix ] = {
+		expand: function( value ) {
+			var i = 0,
+				expanded = {},
+
+				// assumes a single number if not a string
+				parts = typeof value === "string" ? value.split(" ") : [ value ];
+
+			for ( ; i < 4; i++ ) {
+				expanded[ prefix + cssExpand[ i ] + suffix ] =
+					parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
+			}
+
+			return expanded;
+		}
+	};
+
+	if ( !rmargin.test( prefix ) ) {
+		jQuery.cssHooks[ prefix + suffix ].set = setPositiveNumber;
+	}
+});
+
+jQuery.fn.extend({
+	css: function( name, value ) {
+		return access( this, function( elem, name, value ) {
+			var styles, len,
+				map = {},
+				i = 0;
+
+			if ( jQuery.isArray( name ) ) {
+				styles = getStyles( elem );
+				len = name.length;
+
+				for ( ; i < len; i++ ) {
+					map[ name[ i ] ] = jQuery.css( elem, name[ i ], false, styles );
+				}
+
+				return map;
+			}
+
+			return value !== undefined ?
+				jQuery.style( elem, name, value ) :
+				jQuery.css( elem, name );
+		}, name, value, arguments.length > 1 );
+	},
+	show: function() {
+		return showHide( this, true );
+	},
+	hide: function() {
+		return showHide( this );
+	},
+	toggle: function( state ) {
+		if ( typeof state === "boolean" ) {
+			return state ? this.show() : this.hide();
+		}
+
+		return this.each(function() {
+			if ( isHidden( this ) ) {
+				jQuery( this ).show();
+			} else {
+				jQuery( this ).hide();
+			}
+		});
+	}
+});
+
+
+function Tween( elem, options, prop, end, easing ) {
+	return new Tween.prototype.init( elem, options, prop, end, easing );
+}
+jQuery.Tween = Tween;
+
+Tween.prototype = {
+	constructor: Tween,
+	init: function( elem, options, prop, end, easing, unit ) {
+		this.elem = elem;
+		this.prop = prop;
+		this.easing = easing || "swing";
+		this.options = options;
+		this.start = this.now = this.cur();
+		this.end = end;
+		this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
+	},
+	cur: function() {
+		var hooks = Tween.propHooks[ this.prop ];
+
+		return hooks && hooks.get ?
+			hooks.get( this ) :
+			Tween.propHooks._default.get( this );
+	},
+	run: function( percent ) {
+		var eased,
+			hooks = Tween.propHooks[ this.prop ];
+
+		if ( this.options.duration ) {
+			this.pos = eased = jQuery.easing[ this.easing ](
+				percent, this.options.duration * percent, 0, 1, this.options.duration
+			);
+		} else {
+			this.pos = eased = percent;
+		}
+		this.now = ( this.end - this.start ) * eased + this.start;
+
+		if ( this.options.step ) {
+			this.options.step.call( this.elem, this.now, this );
+		}
+
+		if ( hooks && hooks.set ) {
+			hooks.set( this );
+		} else {
+			Tween.propHooks._default.set( this );
+		}
+		return this;
+	}
+};
+
+Tween.prototype.init.prototype = Tween.prototype;
+
+Tween.propHooks = {
+	_default: {
+		get: function( tween ) {
+			var result;
+
+			if ( tween.elem[ tween.prop ] != null &&
+				(!tween.elem.style || tween.elem.style[ tween.prop ] == null) ) {
+				return tween.elem[ tween.prop ];
+			}
+
+			// passing an empty string as a 3rd parameter to .css will automatically
+			// attempt a parseFloat and fallback to a string if the parse fails
+			// so, simple values such as "10px" are parsed to Float.
+			// complex values such as "rotate(1rad)" are returned as is.
+			result = jQuery.css( tween.elem, tween.prop, "" );
+			// Empty strings, null, undefined and "auto" are converted to 0.
+			return !result || result === "auto" ? 0 : result;
+		},
+		set: function( tween ) {
+			// use step hook for back compat - use cssHook if its there - use .style if its
+			// available and use plain properties where available
+			if ( jQuery.fx.step[ tween.prop ] ) {
+				jQuery.fx.step[ tween.prop ]( tween );
+			} else if ( tween.elem.style && ( tween.elem.style[ jQuery.cssProps[ tween.prop ] ] != null || jQuery.cssHooks[ tween.prop ] ) ) {
+				jQuery.style( tween.elem, tween.prop, tween.now + tween.unit );
+			} else {
+				tween.elem[ tween.prop ] = tween.now;
+			}
+		}
+	}
+};
+
+// Support: IE9
+// Panic based approach to setting things on disconnected nodes
+
+Tween.propHooks.scrollTop = Tween.propHooks.scrollLeft = {
+	set: function( tween ) {
+		if ( tween.elem.nodeType && tween.elem.parentNode ) {
+			tween.elem[ tween.prop ] = tween.now;
+		}
+	}
+};
+
+jQuery.easing = {
+	linear: function( p ) {
+		return p;
+	},
+	swing: function( p ) {
+		return 0.5 - Math.cos( p * Math.PI ) / 2;
+	}
+};
+
+jQuery.fx = Tween.prototype.init;
+
+// Back Compat <1.8 extension point
+jQuery.fx.step = {};
+
+
+
+
+var
+	fxNow, timerId,
+	rfxtypes = /^(?:toggle|show|hide)$/,
+	rfxnum = new RegExp( "^(?:([+-])=|)(" + pnum + ")([a-z%]*)$", "i" ),
+	rrun = /queueHooks$/,
+	animationPrefilters = [ defaultPrefilter ],
+	tweeners = {
+		"*": [ function( prop, value ) {
+			var tween = this.createTween( prop, value ),
+				target = tween.cur(),
+				parts = rfxnum.exec( value ),
+				unit = parts && parts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),
+
+				// Starting value computation is required for potential unit mismatches
+				start = ( jQuery.cssNumber[ prop ] || unit !== "px" && +target ) &&
+					rfxnum.exec( jQuery.css( tween.elem, prop ) ),
+				scale = 1,
+				maxIterations = 20;
+
+			if ( start && start[ 3 ] !== unit ) {
+				// Trust units reported by jQuery.css
+				unit = unit || start[ 3 ];
+
+				// Make sure we update the tween properties later on
+				parts = parts || [];
+
+				// Iteratively approximate from a nonzero starting point
+				start = +target || 1;
+
+				do {
+					// If previous iteration zeroed out, double until we get *something*
+					// Use a string for doubling factor so we don't accidentally see scale as unchanged below
+					scale = scale || ".5";
+
+					// Adjust and apply
+					start = start / scale;
+					jQuery.style( tween.elem, prop, start + unit );
+
+				// Update scale, tolerating zero or NaN from tween.cur()
+				// And breaking the loop if scale is unchanged or perfect, or if we've just had enough
+				} while ( scale !== (scale = tween.cur() / target) && scale !== 1 && --maxIterations );
+			}
+
+			// Update tween properties
+			if ( parts ) {
+				start = tween.start = +start || +target || 0;
+				tween.unit = unit;
+				// If a +=/-= token was provided, we're doing a relative animation
+				tween.end = parts[ 1 ] ?
+					start + ( parts[ 1 ] + 1 ) * parts[ 2 ] :
+					+parts[ 2 ];
+			}
+
+			return tween;
+		} ]
+	};
+
+// Animations created synchronously will run synchronously
+function createFxNow() {
+	setTimeout(function() {
+		fxNow = undefined;
+	});
+	return ( fxNow = jQuery.now() );
+}
+
+// Generate parameters to create a standard animation
+function genFx( type, includeWidth ) {
+	var which,
+		i = 0,
+		attrs = { height: type };
+
+	// if we include width, step value is 1 to do all cssExpand values,
+	// if we don't include width, step value is 2 to skip over Left and Right
+	includeWidth = includeWidth ? 1 : 0;
+	for ( ; i < 4 ; i += 2 - includeWidth ) {
+		which = cssExpand[ i ];
+		attrs[ "margin" + which ] = attrs[ "padding" + which ] = type;
+	}
+
+	if ( includeWidth ) {
+		attrs.opacity = attrs.width = type;
+	}
+
+	return attrs;
+}
+
+function createTween( value, prop, animation ) {
+	var tween,
+		collection = ( tweeners[ prop ] || [] ).concat( tweeners[ "*" ] ),
+		index = 0,
+		length = collection.length;
+	for ( ; index < length; index++ ) {
+		if ( (tween = collection[ index ].call( animation, prop, value )) ) {
+
+			// we're done with this property
+			return tween;
+		}
+	}
+}
+
+function defaultPrefilter( elem, props, opts ) {
+	/* jshint validthis: true */
+	var prop, value, toggle, tween, hooks, oldfire, display, checkDisplay,
+		anim = this,
+		orig = {},
+		style = elem.style,
+		hidden = elem.nodeType && isHidden( elem ),
+		dataShow = data_priv.get( elem, "fxshow" );
+
+	// handle queue: false promises
+	if ( !opts.queue ) {
+		hooks = jQuery._queueHooks( elem, "fx" );
+		if ( hooks.unqueued == null ) {
+			hooks.unqueued = 0;
+			oldfire = hooks.empty.fire;
+			hooks.empty.fire = function() {
+				if ( !hooks.unqueued ) {
+					oldfire();
+				}
+			};
+		}
+		hooks.unqueued++;
+
+		anim.always(function() {
+			// doing this makes sure that the complete handler will be called
+			// before this completes
+			anim.always(function() {
+				hooks.unqueued--;
+				if ( !jQuery.queue( elem, "fx" ).length ) {
+					hooks.empty.fire();
+				}
+			});
+		});
+	}
+
+	// height/width overflow pass
+	if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
+		// Make sure that nothing sneaks out
+		// Record all 3 overflow attributes because IE9-10 do not
+		// change the overflow attribute when overflowX and
+		// overflowY are set to the same value
+		opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];
+
+		// Set display property to inline-block for height/width
+		// animations on inline elements that are having width/height animated
+		display = jQuery.css( elem, "display" );
+
+		// Test default display if display is currently "none"
+		checkDisplay = display === "none" ?
+			data_priv.get( elem, "olddisplay" ) || defaultDisplay( elem.nodeName ) : display;
+
+		if ( checkDisplay === "inline" && jQuery.css( elem, "float" ) === "none" ) {
+			style.display = "inline-block";
+		}
+	}
+
+	if ( opts.overflow ) {
+		style.overflow = "hidden";
+		anim.always(function() {
+			style.overflow = opts.overflow[ 0 ];
+			style.overflowX = opts.overflow[ 1 ];
+			style.overflowY = opts.overflow[ 2 ];
+		});
+	}
+
+	// show/hide pass
+	for ( prop in props ) {
+		value = props[ prop ];
+		if ( rfxtypes.exec( value ) ) {
+			delete props[ prop ];
+			toggle = toggle || value === "toggle";
+			if ( value === ( hidden ? "hide" : "show" ) ) {
+
+				// If there is dataShow left over from a stopped hide or show and we are going to proceed with show, we should pretend to be hidden
+				if ( value === "show" && dataShow && dataShow[ prop ] !== undefined ) {
+					hidden = true;
+				} else {
+					continue;
+				}
+			}
+			orig[ prop ] = dataShow && dataShow[ prop ] || jQuery.style( elem, prop );
+
+		// Any non-fx value stops us from restoring the original display value
+		} else {
+			display = undefined;
+		}
+	}
+
+	if ( !jQuery.isEmptyObject( orig ) ) {
+		if ( dataShow ) {
+			if ( "hidden" in dataShow ) {
+				hidden = dataShow.hidden;
+			}
+		} else {
+			dataShow = data_priv.access( elem, "fxshow", {} );
+		}
+
+		// store state if its toggle - enables .stop().toggle() to "reverse"
+		if ( toggle ) {
+			dataShow.hidden = !hidden;
+		}
+		if ( hidden ) {
+			jQuery( elem ).show();
+		} else {
+			anim.done(function() {
+				jQuery( elem ).hide();
+			});
+		}
+		anim.done(function() {
+			var prop;
+
+			data_priv.remove( elem, "fxshow" );
+			for ( prop in orig ) {
+				jQuery.style( elem, prop, orig[ prop ] );
+			}
+		});
+		for ( prop in orig ) {
+			tween = createTween( hidden ? dataShow[ prop ] : 0, prop, anim );
+
+			if ( !( prop in dataShow ) ) {
+				dataShow[ prop ] = tween.start;
+				if ( hidden ) {
+					tween.end = tween.start;
+					tween.start = prop === "width" || prop === "height" ? 1 : 0;
+				}
+			}
+		}
+
+	// If this is a noop like .hide().hide(), restore an overwritten display value
+	} else if ( (display === "none" ? defaultDisplay( elem.nodeName ) : display) === "inline" ) {
+		style.display = display;
+	}
+}
+
+function propFilter( props, specialEasing ) {
+	var index, name, easing, value, hooks;
+
+	// camelCase, specialEasing and expand cssHook pass
+	for ( index in props ) {
+		name = jQuery.camelCase( index );
+		easing = specialEasing[ name ];
+		value = props[ index ];
+		if ( jQuery.isArray( value ) ) {
+			easing = value[ 1 ];
+			value = props[ index ] = value[ 0 ];
+		}
+
+		if ( index !== name ) {
+			props[ name ] = value;
+			delete props[ index ];
+		}
+
+		hooks = jQuery.cssHooks[ name ];
+		if ( hooks && "expand" in hooks ) {
+			value = hooks.expand( value );
+			delete props[ name ];
+
+			// not quite $.extend, this wont overwrite keys already present.
+			// also - reusing 'index' from above because we have the correct "name"
+			for ( index in value ) {
+				if ( !( index in props ) ) {
+					props[ index ] = value[ index ];
+					specialEasing[ index ] = easing;
+				}
+			}
+		} else {
+			specialEasing[ name ] = easing;
+		}
+	}
+}
+
+function Animation( elem, properties, options ) {
+	var result,
+		stopped,
+		index = 0,
+		length = animationPrefilters.length,
+		deferred = jQuery.Deferred().always( function() {
+			// don't match elem in the :animated selector
+			delete tick.elem;
+		}),
+		tick = function() {
+			if ( stopped ) {
+				return false;
+			}
+			var currentTime = fxNow || createFxNow(),
+				remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),
+				// archaic crash bug won't allow us to use 1 - ( 0.5 || 0 ) (#12497)
+				temp = remaining / animation.duration || 0,
+				percent = 1 - temp,
+				index = 0,
+				length = animation.tweens.length;
+
+			for ( ; index < length ; index++ ) {
+				animation.tweens[ index ].run( percent );
+			}
+
+			deferred.notifyWith( elem, [ animation, percent, remaining ]);
+
+			if ( percent < 1 && length ) {
+				return remaining;
+			} else {
+				deferred.resolveWith( elem, [ animation ] );
+				return false;
+			}
+		},
+		animation = deferred.promise({
+			elem: elem,
+			props: jQuery.extend( {}, properties ),
+			opts: jQuery.extend( true, { specialEasing: {} }, options ),
+			originalProperties: properties,
+			originalOptions: options,
+			startTime: fxNow || createFxNow(),
+			duration: options.duration,
+			tweens: [],
+			createTween: function( prop, end ) {
+				var tween = jQuery.Tween( elem, animation.opts, prop, end,
+						animation.opts.specialEasing[ prop ] || animation.opts.easing );
+				animation.tweens.push( tween );
+				return tween;
+			},
+			stop: function( gotoEnd ) {
+				var index = 0,
+					// if we are going to the end, we want to run all the tweens
+					// otherwise we skip this part
+					length = gotoEnd ? animation.tweens.length : 0;
+				if ( stopped ) {
+					return this;
+				}
+				stopped = true;
+				for ( ; index < length ; index++ ) {
+					animation.tweens[ index ].run( 1 );
+				}
+
+				// resolve when we played the last frame
+				// otherwise, reject
+				if ( gotoEnd ) {
+					deferred.resolveWith( elem, [ animation, gotoEnd ] );
+				} else {
+					deferred.rejectWith( elem, [ animation, gotoEnd ] );
+				}
+				return this;
+			}
+		}),
+		props = animation.props;
+
+	propFilter( props, animation.opts.specialEasing );
+
+	for ( ; index < length ; index++ ) {
+		result = animationPrefilters[ index ].call( animation, elem, props, animation.opts );
+		if ( result ) {
+			return result;
+		}
+	}
+
+	jQuery.map( props, createTween, animation );
+
+	if ( jQuery.isFunction( animation.opts.start ) ) {
+		animation.opts.start.call( elem, animation );
+	}
+
+	jQuery.fx.timer(
+		jQuery.extend( tick, {
+			elem: elem,
+			anim: animation,
+			queue: animation.opts.queue
+		})
+	);
+
+	// attach callbacks from options
+	return animation.progress( animation.opts.progress )
+		.done( animation.opts.done, animation.opts.complete )
+		.fail( animation.opts.fail )
+		.always( animation.opts.always );
+}
+
+jQuery.Animation = jQuery.extend( Animation, {
+
+	tweener: function( props, callback ) {
+		if ( jQuery.isFunction( props ) ) {
+			callback = props;
+			props = [ "*" ];
+		} else {
+			props = props.split(" ");
+		}
+
+		var prop,
+			index = 0,
+			length = props.length;
+
+		for ( ; index < length ; index++ ) {
+			prop = props[ index ];
+			tweeners[ prop ] = tweeners[ prop ] || [];
+			tweeners[ prop ].unshift( callback );
+		}
+	},
+
+	prefilter: function( callback, prepend ) {
+		if ( prepend ) {
+			animationPrefilters.unshift( callback );
+		} else {
+			animationPrefilters.push( callback );
+		}
+	}
+});
+
+jQuery.speed = function( speed, easing, fn ) {
+	var opt = speed && typeof speed === "object" ? jQuery.extend( {}, speed ) : {
+		complete: fn || !fn && easing ||
+			jQuery.isFunction( speed ) && speed,
+		duration: speed,
+		easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
+	};
+
+	opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
+		opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;
+
+	// normalize opt.queue - true/undefined/null -> "fx"
+	if ( opt.queue == null || opt.queue === true ) {
+		opt.queue = "fx";
+	}
+
+	// Queueing
+	opt.old = opt.complete;
+
+	opt.complete = function() {
+		if ( jQuery.isFunction( opt.old ) ) {
+			opt.old.call( this );
+		}
+
+		if ( opt.queue ) {
+			jQuery.dequeue( this, opt.queue );
+		}
+	};
+
+	return opt;
+};
+
+jQuery.fn.extend({
+	fadeTo: function( speed, to, easing, callback ) {
+
+		// show any hidden elements after setting opacity to 0
+		return this.filter( isHidden ).css( "opacity", 0 ).show()
+
+			// animate to the value specified
+			.end().animate({ opacity: to }, speed, easing, callback );
+	},
+	animate: function( prop, speed, easing, callback ) {
+		var empty = jQuery.isEmptyObject( prop ),
+			optall = jQuery.speed( speed, easing, callback ),
+			doAnimation = function() {
+				// Operate on a copy of prop so per-property easing won't be lost
+				var anim = Animation( this, jQuery.extend( {}, prop ), optall );
+
+				// Empty animations, or finishing resolves immediately
+				if ( empty || data_priv.get( this, "finish" ) ) {
+					anim.stop( true );
+				}
+			};
+			doAnimation.finish = doAnimation;
+
+		return empty || optall.queue === false ?
+			this.each( doAnimation ) :
+			this.queue( optall.queue, doAnimation );
+	},
+	stop: function( type, clearQueue, gotoEnd ) {
+		var stopQueue = function( hooks ) {
+			var stop = hooks.stop;
+			delete hooks.stop;
+			stop( gotoEnd );
+		};
+
+		if ( typeof type !== "string" ) {
+			gotoEnd = clearQueue;
+			clearQueue = type;
+			type = undefined;
+		}
+		if ( clearQueue && type !== false ) {
+			this.queue( type || "fx", [] );
+		}
+
+		return this.each(function() {
+			var dequeue = true,
+				index = type != null && type + "queueHooks",
+				timers = jQuery.timers,
+				data = data_priv.get( this );
+
+			if ( index ) {
+				if ( data[ index ] && data[ index ].stop ) {
+					stopQueue( data[ index ] );
+				}
+			} else {
+				for ( index in data ) {
+					if ( data[ index ] && data[ index ].stop && rrun.test( index ) ) {
+						stopQueue( data[ index ] );
+					}
+				}
+			}
+
+			for ( index = timers.length; index--; ) {
+				if ( timers[ index ].elem === this && (type == null || timers[ index ].queue === type) ) {
+					timers[ index ].anim.stop( gotoEnd );
+					dequeue = false;
+					timers.splice( index, 1 );
+				}
+			}
+
+			// start the next in the queue if the last step wasn't forced
+			// timers currently will call their complete callbacks, which will dequeue
+			// but only if they were gotoEnd
+			if ( dequeue || !gotoEnd ) {
+				jQuery.dequeue( this, type );
+			}
+		});
+	},
+	finish: function( type ) {
+		if ( type !== false ) {
+			type = type || "fx";
+		}
+		return this.each(function() {
+			var index,
+				data = data_priv.get( this ),
+				queue = data[ type + "queue" ],
+				hooks = data[ type + "queueHooks" ],
+				timers = jQuery.timers,
+				length = queue ? queue.length : 0;
+
+			// enable finishing flag on private data
+			data.finish = true;
+
+			// empty the queue first
+			jQuery.queue( this, type, [] );
+
+			if ( hooks && hooks.stop ) {
+				hooks.stop.call( this, true );
+			}
+
+			// look for any active animations, and finish them
+			for ( index = timers.length; index--; ) {
+				if ( timers[ index ].elem === this && timers[ index ].queue === type ) {
+					timers[ index ].anim.stop( true );
+					timers.splice( index, 1 );
+				}
+			}
+
+			// look for any animations in the old queue and finish them
+			for ( index = 0; index < length; index++ ) {
+				if ( queue[ index ] && queue[ index ].finish ) {
+					queue[ index ].finish.call( this );
+				}
+			}
+
+			// turn off finishing flag
+			delete data.finish;
+		});
+	}
+});
+
+jQuery.each([ "toggle", "show", "hide" ], function( i, name ) {
+	var cssFn = jQuery.fn[ name ];
+	jQuery.fn[ name ] = function( speed, easing, callback ) {
+		return speed == null || typeof speed === "boolean" ?
+			cssFn.apply( this, arguments ) :
+			this.animate( genFx( name, true ), speed, easing, callback );
+	};
+});
+
+// Generate shortcuts for custom animations
+jQuery.each({
+	slideDown: genFx("show"),
+	slideUp: genFx("hide"),
+	slideToggle: genFx("toggle"),
+	fadeIn: { opacity: "show" },
+	fadeOut: { opacity: "hide" },
+	fadeToggle: { opacity: "toggle" }
+}, function( name, props ) {
+	jQuery.fn[ name ] = function( speed, easing, callback ) {
+		return this.animate( props, speed, easing, callback );
+	};
+});
+
+jQuery.timers = [];
+jQuery.fx.tick = function() {
+	var timer,
+		i = 0,
+		timers = jQuery.timers;
+
+	fxNow = jQuery.now();
+
+	for ( ; i < timers.length; i++ ) {
+		timer = timers[ i ];
+		// Checks the timer has not already been removed
+		if ( !timer() && timers[ i ] === timer ) {
+			timers.splice( i--, 1 );
+		}
+	}
+
+	if ( !timers.length ) {
+		jQuery.fx.stop();
+	}
+	fxNow = undefined;
+};
+
+jQuery.fx.timer = function( timer ) {
+	jQuery.timers.push( timer );
+	if ( timer() ) {
+		jQuery.fx.start();
+	} else {
+		jQuery.timers.pop();
+	}
+};
+
+jQuery.fx.interval = 13;
+
+jQuery.fx.start = function() {
+	if ( !timerId ) {
+		timerId = setInterval( jQuery.fx.tick, jQuery.fx.interval );
+	}
+};
+
+jQuery.fx.stop = function() {
+	clearInterval( timerId );
+	timerId = null;
+};
+
+jQuery.fx.speeds = {
+	slow: 600,
+	fast: 200,
+	// Default speed
+	_default: 400
+};
+
+
+// Based off of the plugin by Clint Helfers, with permission.
+// http://blindsignals.com/index.php/2009/07/jquery-delay/
+jQuery.fn.delay = function( time, type ) {
+	time = jQuery.fx ? jQuery.fx.speeds[ time ] || time : time;
+	type = type || "fx";
+
+	return this.queue( type, function( next, hooks ) {
+		var timeout = setTimeout( next, time );
+		hooks.stop = function() {
+			clearTimeout( timeout );
+		};
+	});
+};
+
+
+(function() {
+	var input = document.createElement( "input" ),
+		select = document.createElement( "select" ),
+		opt = select.appendChild( document.createElement( "option" ) );
+
+	input.type = "checkbox";
+
+	// Support: iOS 5.1, Android 4.x, Android 2.3
+	// Check the default checkbox/radio value ("" on old WebKit; "on" elsewhere)
+	support.checkOn = input.value !== "";
+
+	// Must access the parent to make an option select properly
+	// Support: IE9, IE10
+	support.optSelected = opt.selected;
+
+	// Make sure that the options inside disabled selects aren't marked as disabled
+	// (WebKit marks them as disabled)
+	select.disabled = true;
+	support.optDisabled = !opt.disabled;
+
+	// Check if an input maintains its value after becoming a radio
+	// Support: IE9, IE10
+	input = document.createElement( "input" );
+	input.value = "t";
+	input.type = "radio";
+	support.radioValue = input.value === "t";
+})();
+
+
+var nodeHook, boolHook,
+	attrHandle = jQuery.expr.attrHandle;
+
+jQuery.fn.extend({
+	attr: function( name, value ) {
+		return access( this, jQuery.attr, name, value, arguments.length > 1 );
+	},
+
+	removeAttr: function( name ) {
+		return this.each(function() {
+			jQuery.removeAttr( this, name );
+		});
+	}
+});
+
+jQuery.extend({
+	attr: function( elem, name, value ) {
+		var hooks, ret,
+			nType = elem.nodeType;
+
+		// don't get/set attributes on text, comment and attribute nodes
+		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
+			return;
+		}
+
+		// Fallback to prop when attributes are not supported
+		if ( typeof elem.getAttribute === strundefined ) {
+			return jQuery.prop( elem, name, value );
+		}
+
+		// All attributes are lowercase
+		// Grab necessary hook if one is defined
+		if ( nType !== 1 || !jQuery.isXMLDoc( elem ) ) {
+			name = name.toLowerCase();
+			hooks = jQuery.attrHooks[ name ] ||
+				( jQuery.expr.match.bool.test( name ) ? boolHook : nodeHook );
+		}
+
+		if ( value !== undefined ) {
+
+			if ( value === null ) {
+				jQuery.removeAttr( elem, name );
+
+			} else if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
+				return ret;
+
+			} else {
+				elem.setAttribute( name, value + "" );
+				return value;
+			}
+
+		} else if ( hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {
+			return ret;
+
+		} else {
+			ret = jQuery.find.attr( elem, name );
+
+			// Non-existent attributes return null, we normalize to undefined
+			return ret == null ?
+				undefined :
+				ret;
+		}
+	},
+
+	removeAttr: function( elem, value ) {
+		var name, propName,
+			i = 0,
+			attrNames = value && value.match( rnotwhite );
+
+		if ( attrNames && elem.nodeType === 1 ) {
+			while ( (name = attrNames[i++]) ) {
+				propName = jQuery.propFix[ name ] || name;
+
+				// Boolean attributes get special treatment (#10870)
+				if ( jQuery.expr.match.bool.test( name ) ) {
+					// Set corresponding property to false
+					elem[ propName ] = false;
+				}
+
+				elem.removeAttribute( name );
+			}
+		}
+	},
+
+	attrHooks: {
+		type: {
+			set: function( elem, value ) {
+				if ( !support.radioValue && value === "radio" &&
+					jQuery.nodeName( elem, "input" ) ) {
+					// Setting the type on a radio button after the value resets the value in IE6-9
+					// Reset value to default in case type is set after value during creation
+					var val = elem.value;
+					elem.setAttribute( "type", value );
+					if ( val ) {
+						elem.value = val;
+					}
+					return value;
+				}
+			}
+		}
+	}
+});
+
+// Hooks for boolean attributes
+boolHook = {
+	set: function( elem, value, name ) {
+		if ( value === false ) {
+			// Remove boolean attributes when set to false
+			jQuery.removeAttr( elem, name );
+		} else {
+			elem.setAttribute( name, name );
+		}
+		return name;
+	}
+};
+jQuery.each( jQuery.expr.match.bool.source.match( /\w+/g ), function( i, name ) {
+	var getter = attrHandle[ name ] || jQuery.find.attr;
+
+	attrHandle[ name ] = function( elem, name, isXML ) {
+		var ret, handle;
+		if ( !isXML ) {
+			// Avoid an infinite loop by temporarily removing this function from the getter
+			handle = attrHandle[ name ];
+			attrHandle[ name ] = ret;
+			ret = getter( elem, name, isXML ) != null ?
+				name.toLowerCase() :
+				null;
+			attrHandle[ name ] = handle;
+		}
+		return ret;
+	};
+});
+
+
+
+
+var rfocusable = /^(?:input|select|textarea|button)$/i;
+
+jQuery.fn.extend({
+	prop: function( name, value ) {
+		return access( this, jQuery.prop, name, value, arguments.length > 1 );
+	},
+
+	removeProp: function( name ) {
+		return this.each(function() {
+			delete this[ jQuery.propFix[ name ] || name ];
+		});
+	}
+});
+
+jQuery.extend({
+	propFix: {
+		"for": "htmlFor",
+		"class": "className"
+	},
+
+	prop: function( elem, name, value ) {
+		var ret, hooks, notxml,
+			nType = elem.nodeType;
+
+		// don't get/set properties on text, comment and attribute nodes
+		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
+			return;
+		}
+
+		notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
+
+		if ( notxml ) {
+			// Fix name and attach hooks
+			name = jQuery.propFix[ name ] || name;
+			hooks = jQuery.propHooks[ name ];
+		}
+
+		if ( value !== undefined ) {
+			return hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ?
+				ret :
+				( elem[ name ] = value );
+
+		} else {
+			return hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ?
+				ret :
+				elem[ name ];
+		}
+	},
+
+	propHooks: {
+		tabIndex: {
+			get: function( elem ) {
+				return elem.hasAttribute( "tabindex" ) || rfocusable.test( elem.nodeName ) || elem.href ?
+					elem.tabIndex :
+					-1;
+			}
+		}
+	}
+});
+
+// Support: IE9+
+// Selectedness for an option in an optgroup can be inaccurate
+if ( !support.optSelected ) {
+	jQuery.propHooks.selected = {
+		get: function( elem ) {
+			var parent = elem.parentNode;
+			if ( parent && parent.parentNode ) {
+				parent.parentNode.selectedIndex;
+			}
+			return null;
+		}
+	};
+}
+
+jQuery.each([
+	"tabIndex",
+	"readOnly",
+	"maxLength",
+	"cellSpacing",
+	"cellPadding",
+	"rowSpan",
+	"colSpan",
+	"useMap",
+	"frameBorder",
+	"contentEditable"
+], function() {
+	jQuery.propFix[ this.toLowerCase() ] = this;
+});
+
+
+
+
+var rclass = /[\t\r\n\f]/g;
+
+jQuery.fn.extend({
+	addClass: function( value ) {
+		var classes, elem, cur, clazz, j, finalValue,
+			proceed = typeof value === "string" && value,
+			i = 0,
+			len = this.length;
+
+		if ( jQuery.isFunction( value ) ) {
+			return this.each(function( j ) {
+				jQuery( this ).addClass( value.call( this, j, this.className ) );
+			});
+		}
+
+		if ( proceed ) {
+			// The disjunction here is for better compressibility (see removeClass)
+			classes = ( value || "" ).match( rnotwhite ) || [];
+
+			for ( ; i < len; i++ ) {
+				elem = this[ i ];
+				cur = elem.nodeType === 1 && ( elem.className ?
+					( " " + elem.className + " " ).replace( rclass, " " ) :
+					" "
+				);
+
+				if ( cur ) {
+					j = 0;
+					while ( (clazz = classes[j++]) ) {
+						if ( cur.indexOf( " " + clazz + " " ) < 0 ) {
+							cur += clazz + " ";
+						}
+					}
+
+					// only assign if different to avoid unneeded rendering.
+					finalValue = jQuery.trim( cur );
+					if ( elem.className !== finalValue ) {
+						elem.className = finalValue;
+					}
+				}
+			}
+		}
+
+		return this;
+	},
+
+	removeClass: function( value ) {
+		var classes, elem, cur, clazz, j, finalValue,
+			proceed = arguments.length === 0 || typeof value === "string" && value,
+			i = 0,
+			len = this.length;
+
+		if ( jQuery.isFunction( value ) ) {
+			return this.each(function( j ) {
+				jQuery( this ).removeClass( value.call( this, j, this.className ) );
+			});
+		}
+		if ( proceed ) {
+			classes = ( value || "" ).match( rnotwhite ) || [];
+
+			for ( ; i < len; i++ ) {
+				elem = this[ i ];
+				// This expression is here for better compressibility (see addClass)
+				cur = elem.nodeType === 1 && ( elem.className ?
+					( " " + elem.className + " " ).replace( rclass, " " ) :
+					""
+				);
+
+				if ( cur ) {
+					j = 0;
+					while ( (clazz = classes[j++]) ) {
+						// Remove *all* instances
+						while ( cur.indexOf( " " + clazz + " " ) >= 0 ) {
+							cur = cur.replace( " " + clazz + " ", " " );
+						}
+					}
+
+					// only assign if different to avoid unneeded rendering.
+					finalValue = value ? jQuery.trim( cur ) : "";
+					if ( elem.className !== finalValue ) {
+						elem.className = finalValue;
+					}
+				}
+			}
+		}
+
+		return this;
+	},
+
+	toggleClass: function( value, stateVal ) {
+		var type = typeof value;
+
+		if ( typeof stateVal === "boolean" && type === "string" ) {
+			return stateVal ? this.addClass( value ) : this.removeClass( value );
+		}
+
+		if ( jQuery.isFunction( value ) ) {
+			return this.each(function( i ) {
+				jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );
+			});
+		}
+
+		return this.each(function() {
+			if ( type === "string" ) {
+				// toggle individual class names
+				var className,
+					i = 0,
+					self = jQuery( this ),
+					classNames = value.match( rnotwhite ) || [];
+
+				while ( (className = classNames[ i++ ]) ) {
+					// check each className given, space separated list
+					if ( self.hasClass( className ) ) {
+						self.removeClass( className );
+					} else {
+						self.addClass( className );
+					}
+				}
+
+			// Toggle whole class name
+			} else if ( type === strundefined || type === "boolean" ) {
+				if ( this.className ) {
+					// store className if set
+					data_priv.set( this, "__className__", this.className );
+				}
+
+				// If the element has a class name or if we're passed "false",
+				// then remove the whole classname (if there was one, the above saved it).
+				// Otherwise bring back whatever was previously saved (if anything),
+				// falling back to the empty string if nothing was stored.
+				this.className = this.className || value === false ? "" : data_priv.get( this, "__className__" ) || "";
+			}
+		});
+	},
+
+	hasClass: function( selector ) {
+		var className = " " + selector + " ",
+			i = 0,
+			l = this.length;
+		for ( ; i < l; i++ ) {
+			if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) >= 0 ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+});
+
+
+
+
+var rreturn = /\r/g;
+
+jQuery.fn.extend({
+	val: function( value ) {
+		var hooks, ret, isFunction,
+			elem = this[0];
+
+		if ( !arguments.length ) {
+			if ( elem ) {
+				hooks = jQuery.valHooks[ elem.type ] || jQuery.valHooks[ elem.nodeName.toLowerCase() ];
+
+				if ( hooks && "get" in hooks && (ret = hooks.get( elem, "value" )) !== undefined ) {
+					return ret;
+				}
+
+				ret = elem.value;
+
+				return typeof ret === "string" ?
+					// handle most common string cases
+					ret.replace(rreturn, "") :
+					// handle cases where value is null/undef or number
+					ret == null ? "" : ret;
+			}
+
+			return;
+		}
+
+		isFunction = jQuery.isFunction( value );
+
+		return this.each(function( i ) {
+			var val;
+
+			if ( this.nodeType !== 1 ) {
+				return;
+			}
+
+			if ( isFunction ) {
+				val = value.call( this, i, jQuery( this ).val() );
+			} else {
+				val = value;
+			}
+
+			// Treat null/undefined as ""; convert numbers to string
+			if ( val == null ) {
+				val = "";
+
+			} else if ( typeof val === "number" ) {
+				val += "";
+
+			} else if ( jQuery.isArray( val ) ) {
+				val = jQuery.map( val, function( value ) {
+					return value == null ? "" : value + "";
+				});
+			}
+
+			hooks = jQuery.valHooks[ this.type ] || jQuery.valHooks[ this.nodeName.toLowerCase() ];
+
+			// If set returns undefined, fall back to normal setting
+			if ( !hooks || !("set" in hooks) || hooks.set( this, val, "value" ) === undefined ) {
+				this.value = val;
+			}
+		});
+	}
+});
+
+jQuery.extend({
+	valHooks: {
+		option: {
+			get: function( elem ) {
+				var val = jQuery.find.attr( elem, "value" );
+				return val != null ?
+					val :
+					// Support: IE10-11+
+					// option.text throws exceptions (#14686, #14858)
+					jQuery.trim( jQuery.text( elem ) );
+			}
+		},
+		select: {
+			get: function( elem ) {
+				var value, option,
+					options = elem.options,
+					index = elem.selectedIndex,
+					one = elem.type === "select-one" || index < 0,
+					values = one ? null : [],
+					max = one ? index + 1 : options.length,
+					i = index < 0 ?
+						max :
+						one ? index : 0;
+
+				// Loop through all the selected options
+				for ( ; i < max; i++ ) {
+					option = options[ i ];
+
+					// IE6-9 doesn't update selected after form reset (#2551)
+					if ( ( option.selected || i === index ) &&
+							// Don't return options that are disabled or in a disabled optgroup
+							( support.optDisabled ? !option.disabled : option.getAttribute( "disabled" ) === null ) &&
+							( !option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" ) ) ) {
+
+						// Get the specific value for the option
+						value = jQuery( option ).val();
+
+						// We don't need an array for one selects
+						if ( one ) {
+							return value;
+						}
+
+						// Multi-Selects return an array
+						values.push( value );
+					}
+				}
+
+				return values;
+			},
+
+			set: function( elem, value ) {
+				var optionSet, option,
+					options = elem.options,
+					values = jQuery.makeArray( value ),
+					i = options.length;
+
+				while ( i-- ) {
+					option = options[ i ];
+					if ( (option.selected = jQuery.inArray( option.value, values ) >= 0) ) {
+						optionSet = true;
+					}
+				}
+
+				// force browsers to behave consistently when non-matching value is set
+				if ( !optionSet ) {
+					elem.selectedIndex = -1;
+				}
+				return values;
+			}
+		}
+	}
+});
+
+// Radios and checkboxes getter/setter
+jQuery.each([ "radio", "checkbox" ], function() {
+	jQuery.valHooks[ this ] = {
+		set: function( elem, value ) {
+			if ( jQuery.isArray( value ) ) {
+				return ( elem.checked = jQuery.inArray( jQuery(elem).val(), value ) >= 0 );
+			}
+		}
+	};
+	if ( !support.checkOn ) {
+		jQuery.valHooks[ this ].get = function( elem ) {
+			// Support: Webkit
+			// "" is returned instead of "on" if a value isn't specified
+			return elem.getAttribute("value") === null ? "on" : elem.value;
+		};
+	}
+});
+
+
+
+
+// Return jQuery for attributes-only inclusion
+
+
+jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
+	"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
+	"change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {
+
+	// Handle event binding
+	jQuery.fn[ name ] = function( data, fn ) {
+		return arguments.length > 0 ?
+			this.on( name, null, data, fn ) :
+			this.trigger( name );
+	};
+});
+
+jQuery.fn.extend({
+	hover: function( fnOver, fnOut ) {
+		return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
+	},
+
+	bind: function( types, data, fn ) {
+		return this.on( types, null, data, fn );
+	},
+	unbind: function( types, fn ) {
+		return this.off( types, null, fn );
+	},
+
+	delegate: function( selector, types, data, fn ) {
+		return this.on( types, selector, data, fn );
+	},
+	undelegate: function( selector, types, fn ) {
+		// ( namespace ) or ( selector, types [, fn] )
+		return arguments.length === 1 ? this.off( selector, "**" ) : this.off( types, selector || "**", fn );
+	}
+});
+
+
+var nonce = jQuery.now();
+
+var rquery = (/\?/);
+
+
+
+// Support: Android 2.3
+// Workaround failure to string-cast null input
+jQuery.parseJSON = function( data ) {
+	return JSON.parse( data + "" );
+};
+
+
+// Cross-browser xml parsing
+jQuery.parseXML = function( data ) {
+	var xml, tmp;
+	if ( !data || typeof data !== "string" ) {
+		return null;
+	}
+
+	// Support: IE9
+	try {
+		tmp = new DOMParser();
+		xml = tmp.parseFromString( data, "text/xml" );
+	} catch ( e ) {
+		xml = undefined;
+	}
+
+	if ( !xml || xml.getElementsByTagName( "parsererror" ).length ) {
+		jQuery.error( "Invalid XML: " + data );
+	}
+	return xml;
+};
+
+
+var
+	// Document location
+	ajaxLocParts,
+	ajaxLocation,
+
+	rhash = /#.*$/,
+	rts = /([?&])_=[^&]*/,
+	rheaders = /^(.*?):[ \t]*([^\r\n]*)$/mg,
+	// #7653, #8125, #8152: local protocol detection
+	rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
+	rnoContent = /^(?:GET|HEAD)$/,
+	rprotocol = /^\/\//,
+	rurl = /^([\w.+-]+:)(?:\/\/(?:[^\/?#]*@|)([^\/?#:]*)(?::(\d+)|)|)/,
+
+	/* Prefilters
+	 * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
+	 * 2) These are called:
+	 *    - BEFORE asking for a transport
+	 *    - AFTER param serialization (s.data is a string if s.processData is true)
+	 * 3) key is the dataType
+	 * 4) the catchall symbol "*" can be used
+	 * 5) execution will start with transport dataType and THEN continue down to "*" if needed
+	 */
+	prefilters = {},
+
+	/* Transports bindings
+	 * 1) key is the dataType
+	 * 2) the catchall symbol "*" can be used
+	 * 3) selection will start with transport dataType and THEN go to "*" if needed
+	 */
+	transports = {},
+
+	// Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
+	allTypes = "*/".concat("*");
+
+// #8138, IE may throw an exception when accessing
+// a field from window.location if document.domain has been set
+try {
+	ajaxLocation = location.href;
+} catch( e ) {
+	// Use the href attribute of an A element
+	// since IE will modify it given document.location
+	ajaxLocation = document.createElement( "a" );
+	ajaxLocation.href = "";
+	ajaxLocation = ajaxLocation.href;
+}
+
+// Segment location into parts
+ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];
+
+// Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
+function addToPrefiltersOrTransports( structure ) {
+
+	// dataTypeExpression is optional and defaults to "*"
+	return function( dataTypeExpression, func ) {
+
+		if ( typeof dataTypeExpression !== "string" ) {
+			func = dataTypeExpression;
+			dataTypeExpression = "*";
+		}
+
+		var dataType,
+			i = 0,
+			dataTypes = dataTypeExpression.toLowerCase().match( rnotwhite ) || [];
+
+		if ( jQuery.isFunction( func ) ) {
+			// For each dataType in the dataTypeExpression
+			while ( (dataType = dataTypes[i++]) ) {
+				// Prepend if requested
+				if ( dataType[0] === "+" ) {
+					dataType = dataType.slice( 1 ) || "*";
+					(structure[ dataType ] = structure[ dataType ] || []).unshift( func );
+
+				// Otherwise append
+				} else {
+					(structure[ dataType ] = structure[ dataType ] || []).push( func );
+				}
+			}
+		}
+	};
+}
+
+// Base inspection function for prefilters and transports
+function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR ) {
+
+	var inspected = {},
+		seekingTransport = ( structure === transports );
+
+	function inspect( dataType ) {
+		var selected;
+		inspected[ dataType ] = true;
+		jQuery.each( structure[ dataType ] || [], function( _, prefilterOrFactory ) {
+			var dataTypeOrTransport = prefilterOrFactory( options, originalOptions, jqXHR );
+			if ( typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[ dataTypeOrTransport ] ) {
+				options.dataTypes.unshift( dataTypeOrTransport );
+				inspect( dataTypeOrTransport );
+				return false;
+			} else if ( seekingTransport ) {
+				return !( selected = dataTypeOrTransport );
+			}
+		});
+		return selected;
+	}
+
+	return inspect( options.dataTypes[ 0 ] ) || !inspected[ "*" ] && inspect( "*" );
+}
+
+// A special extend for ajax options
+// that takes "flat" options (not to be deep extended)
+// Fixes #9887
+function ajaxExtend( target, src ) {
+	var key, deep,
+		flatOptions = jQuery.ajaxSettings.flatOptions || {};
+
+	for ( key in src ) {
+		if ( src[ key ] !== undefined ) {
+			( flatOptions[ key ] ? target : ( deep || (deep = {}) ) )[ key ] = src[ key ];
+		}
+	}
+	if ( deep ) {
+		jQuery.extend( true, target, deep );
+	}
+
+	return target;
+}
+
+/* Handles responses to an ajax request:
+ * - finds the right dataType (mediates between content-type and expected dataType)
+ * - returns the corresponding response
+ */
+function ajaxHandleResponses( s, jqXHR, responses ) {
+
+	var ct, type, finalDataType, firstDataType,
+		contents = s.contents,
+		dataTypes = s.dataTypes;
+
+	// Remove auto dataType and get content-type in the process
+	while ( dataTypes[ 0 ] === "*" ) {
+		dataTypes.shift();
+		if ( ct === undefined ) {
+			ct = s.mimeType || jqXHR.getResponseHeader("Content-Type");
+		}
+	}
+
+	// Check if we're dealing with a known content-type
+	if ( ct ) {
+		for ( type in contents ) {
+			if ( contents[ type ] && contents[ type ].test( ct ) ) {
+				dataTypes.unshift( type );
+				break;
+			}
+		}
+	}
+
+	// Check to see if we have a response for the expected dataType
+	if ( dataTypes[ 0 ] in responses ) {
+		finalDataType = dataTypes[ 0 ];
+	} else {
+		// Try convertible dataTypes
+		for ( type in responses ) {
+			if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
+				finalDataType = type;
+				break;
+			}
+			if ( !firstDataType ) {
+				firstDataType = type;
+			}
+		}
+		// Or just use first one
+		finalDataType = finalDataType || firstDataType;
+	}
+
+	// If we found a dataType
+	// We add the dataType to the list if needed
+	// and return the corresponding response
+	if ( finalDataType ) {
+		if ( finalDataType !== dataTypes[ 0 ] ) {
+			dataTypes.unshift( finalDataType );
+		}
+		return responses[ finalDataType ];
+	}
+}
+
+/* Chain conversions given the request and the original response
+ * Also sets the responseXXX fields on the jqXHR instance
+ */
+function ajaxConvert( s, response, jqXHR, isSuccess ) {
+	var conv2, current, conv, tmp, prev,
+		converters = {},
+		// Work with a copy of dataTypes in case we need to modify it for conversion
+		dataTypes = s.dataTypes.slice();
+
+	// Create converters map with lowercased keys
+	if ( dataTypes[ 1 ] ) {
+		for ( conv in s.converters ) {
+			converters[ conv.toLowerCase() ] = s.converters[ conv ];
+		}
+	}
+
+	current = dataTypes.shift();
+
+	// Convert to each sequential dataType
+	while ( current ) {
+
+		if ( s.responseFields[ current ] ) {
+			jqXHR[ s.responseFields[ current ] ] = response;
+		}
+
+		// Apply the dataFilter if provided
+		if ( !prev && isSuccess && s.dataFilter ) {
+			response = s.dataFilter( response, s.dataType );
+		}
+
+		prev = current;
+		current = dataTypes.shift();
+
+		if ( current ) {
+
+		// There's only work to do if current dataType is non-auto
+			if ( current === "*" ) {
+
+				current = prev;
+
+			// Convert response if prev dataType is non-auto and differs from current
+			} else if ( prev !== "*" && prev !== current ) {
+
+				// Seek a direct converter
+				conv = converters[ prev + " " + current ] || converters[ "* " + current ];
+
+				// If none found, seek a pair
+				if ( !conv ) {
+					for ( conv2 in converters ) {
+
+						// If conv2 outputs current
+						tmp = conv2.split( " " );
+						if ( tmp[ 1 ] === current ) {
+
+							// If prev can be converted to accepted input
+							conv = converters[ prev + " " + tmp[ 0 ] ] ||
+								converters[ "* " + tmp[ 0 ] ];
+							if ( conv ) {
+								// Condense equivalence converters
+								if ( conv === true ) {
+									conv = converters[ conv2 ];
+
+								// Otherwise, insert the intermediate dataType
+								} else if ( converters[ conv2 ] !== true ) {
+									current = tmp[ 0 ];
+									dataTypes.unshift( tmp[ 1 ] );
+								}
+								break;
+							}
+						}
+					}
+				}
+
+				// Apply converter (if not an equivalence)
+				if ( conv !== true ) {
+
+					// Unless errors are allowed to bubble, catch and return them
+					if ( conv && s[ "throws" ] ) {
+						response = conv( response );
+					} else {
+						try {
+							response = conv( response );
+						} catch ( e ) {
+							return { state: "parsererror", error: conv ? e : "No conversion from " + prev + " to " + current };
+						}
+					}
+				}
+			}
+		}
+	}
+
+	return { state: "success", data: response };
+}
+
+jQuery.extend({
+
+	// Counter for holding the number of active queries
+	active: 0,
+
+	// Last-Modified header cache for next request
+	lastModified: {},
+	etag: {},
+
+	ajaxSettings: {
+		url: ajaxLocation,
+		type: "GET",
+		isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
+		global: true,
+		processData: true,
+		async: true,
+		contentType: "application/x-www-form-urlencoded; charset=UTF-8",
+		/*
+		timeout: 0,
+		data: null,
+		dataType: null,
+		username: null,
+		password: null,
+		cache: null,
+		throws: false,
+		traditional: false,
+		headers: {},
+		*/
+
+		accepts: {
+			"*": allTypes,
+			text: "text/plain",
+			html: "text/html",
+			xml: "application/xml, text/xml",
+			json: "application/json, text/javascript"
+		},
+
+		contents: {
+			xml: /xml/,
+			html: /html/,
+			json: /json/
+		},
+
+		responseFields: {
+			xml: "responseXML",
+			text: "responseText",
+			json: "responseJSON"
+		},
+
+		// Data converters
+		// Keys separate source (or catchall "*") and destination types with a single space
+		converters: {
+
+			// Convert anything to text
+			"* text": String,
+
+			// Text to html (true = no transformation)
+			"text html": true,
+
+			// Evaluate text as a json expression
+			"text json": jQuery.parseJSON,
+
+			// Parse text as xml
+			"text xml": jQuery.parseXML
+		},
+
+		// For options that shouldn't be deep extended:
+		// you can add your own custom options here if
+		// and when you create one that shouldn't be
+		// deep extended (see ajaxExtend)
+		flatOptions: {
+			url: true,
+			context: true
+		}
+	},
+
+	// Creates a full fledged settings object into target
+	// with both ajaxSettings and settings fields.
+	// If target is omitted, writes into ajaxSettings.
+	ajaxSetup: function( target, settings ) {
+		return settings ?
+
+			// Building a settings object
+			ajaxExtend( ajaxExtend( target, jQuery.ajaxSettings ), settings ) :
+
+			// Extending ajaxSettings
+			ajaxExtend( jQuery.ajaxSettings, target );
+	},
+
+	ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
+	ajaxTransport: addToPrefiltersOrTransports( transports ),
+
+	// Main method
+	ajax: function( url, options ) {
+
+		// If url is an object, simulate pre-1.5 signature
+		if ( typeof url === "object" ) {
+			options = url;
+			url = undefined;
+		}
+
+		// Force options to be an object
+		options = options || {};
+
+		var transport,
+			// URL without anti-cache param
+			cacheURL,
+			// Response headers
+			responseHeadersString,
+			responseHeaders,
+			// timeout handle
+			timeoutTimer,
+			// Cross-domain detection vars
+			parts,
+			// To know if global events are to be dispatched
+			fireGlobals,
+			// Loop variable
+			i,
+			// Create the final options object
+			s = jQuery.ajaxSetup( {}, options ),
+			// Callbacks context
+			callbackContext = s.context || s,
+			// Context for global events is callbackContext if it is a DOM node or jQuery collection
+			globalEventContext = s.context && ( callbackContext.nodeType || callbackContext.jquery ) ?
+				jQuery( callbackContext ) :
+				jQuery.event,
+			// Deferreds
+			deferred = jQuery.Deferred(),
+			completeDeferred = jQuery.Callbacks("once memory"),
+			// Status-dependent callbacks
+			statusCode = s.statusCode || {},
+			// Headers (they are sent all at once)
+			requestHeaders = {},
+			requestHeadersNames = {},
+			// The jqXHR state
+			state = 0,
+			// Default abort message
+			strAbort = "canceled",
+			// Fake xhr
+			jqXHR = {
+				readyState: 0,
+
+				// Builds headers hashtable if needed
+				getResponseHeader: function( key ) {
+					var match;
+					if ( state === 2 ) {
+						if ( !responseHeaders ) {
+							responseHeaders = {};
+							while ( (match = rheaders.exec( responseHeadersString )) ) {
+								responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
+							}
+						}
+						match = responseHeaders[ key.toLowerCase() ];
+					}
+					return match == null ? null : match;
+				},
+
+				// Raw string
+				getAllResponseHeaders: function() {
+					return state === 2 ? responseHeadersString : null;
+				},
+
+				// Caches the header
+				setRequestHeader: function( name, value ) {
+					var lname = name.toLowerCase();
+					if ( !state ) {
+						name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
+						requestHeaders[ name ] = value;
+					}
+					return this;
+				},
+
+				// Overrides response content-type header
+				overrideMimeType: function( type ) {
+					if ( !state ) {
+						s.mimeType = type;
+					}
+					return this;
+				},
+
+				// Status-dependent callbacks
+				statusCode: function( map ) {
+					var code;
+					if ( map ) {
+						if ( state < 2 ) {
+							for ( code in map ) {
+								// Lazy-add the new callback in a way that preserves old ones
+								statusCode[ code ] = [ statusCode[ code ], map[ code ] ];
+							}
+						} else {
+							// Execute the appropriate callbacks
+							jqXHR.always( map[ jqXHR.status ] );
+						}
+					}
+					return this;
+				},
+
+				// Cancel the request
+				abort: function( statusText ) {
+					var finalText = statusText || strAbort;
+					if ( transport ) {
+						transport.abort( finalText );
+					}
+					done( 0, finalText );
+					return this;
+				}
+			};
+
+		// Attach deferreds
+		deferred.promise( jqXHR ).complete = completeDeferred.add;
+		jqXHR.success = jqXHR.done;
+		jqXHR.error = jqXHR.fail;
+
+		// Remove hash character (#7531: and string promotion)
+		// Add protocol if not provided (prefilters might expect it)
+		// Handle falsy url in the settings object (#10093: consistency with old signature)
+		// We also use the url parameter if available
+		s.url = ( ( url || s.url || ajaxLocation ) + "" ).replace( rhash, "" )
+			.replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
+
+		// Alias method option to type as per ticket #12004
+		s.type = options.method || options.type || s.method || s.type;
+
+		// Extract dataTypes list
+		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().match( rnotwhite ) || [ "" ];
+
+		// A cross-domain request is in order when we have a protocol:host:port mismatch
+		if ( s.crossDomain == null ) {
+			parts = rurl.exec( s.url.toLowerCase() );
+			s.crossDomain = !!( parts &&
+				( parts[ 1 ] !== ajaxLocParts[ 1 ] || parts[ 2 ] !== ajaxLocParts[ 2 ] ||
+					( parts[ 3 ] || ( parts[ 1 ] === "http:" ? "80" : "443" ) ) !==
+						( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? "80" : "443" ) ) )
+			);
+		}
+
+		// Convert data if not already a string
+		if ( s.data && s.processData && typeof s.data !== "string" ) {
+			s.data = jQuery.param( s.data, s.traditional );
+		}
+
+		// Apply prefilters
+		inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
+
+		// If request was aborted inside a prefilter, stop there
+		if ( state === 2 ) {
+			return jqXHR;
+		}
+
+		// We can fire global events as of now if asked to
+		fireGlobals = s.global;
+
+		// Watch for a new set of requests
+		if ( fireGlobals && jQuery.active++ === 0 ) {
+			jQuery.event.trigger("ajaxStart");
+		}
+
+		// Uppercase the type
+		s.type = s.type.toUpperCase();
+
+		// Determine if request has content
+		s.hasContent = !rnoContent.test( s.type );
+
+		// Save the URL in case we're toying with the If-Modified-Since
+		// and/or If-None-Match header later on
+		cacheURL = s.url;
+
+		// More options handling for requests with no content
+		if ( !s.hasContent ) {
+
+			// If data is available, append data to url
+			if ( s.data ) {
+				cacheURL = ( s.url += ( rquery.test( cacheURL ) ? "&" : "?" ) + s.data );
+				// #9682: remove data so that it's not used in an eventual retry
+				delete s.data;
+			}
+
+			// Add anti-cache in url if needed
+			if ( s.cache === false ) {
+				s.url = rts.test( cacheURL ) ?
+
+					// If there is already a '_' parameter, set its value
+					cacheURL.replace( rts, "$1_=" + nonce++ ) :
+
+					// Otherwise add one to the end
+					cacheURL + ( rquery.test( cacheURL ) ? "&" : "?" ) + "_=" + nonce++;
+			}
+		}
+
+		// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+		if ( s.ifModified ) {
+			if ( jQuery.lastModified[ cacheURL ] ) {
+				jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ cacheURL ] );
+			}
+			if ( jQuery.etag[ cacheURL ] ) {
+				jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ cacheURL ] );
+			}
+		}
+
+		// Set the correct header, if data is being sent
+		if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
+			jqXHR.setRequestHeader( "Content-Type", s.contentType );
+		}
+
+		// Set the Accepts header for the server, depending on the dataType
+		jqXHR.setRequestHeader(
+			"Accept",
+			s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
+				s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
+				s.accepts[ "*" ]
+		);
+
+		// Check for headers option
+		for ( i in s.headers ) {
+			jqXHR.setRequestHeader( i, s.headers[ i ] );
+		}
+
+		// Allow custom headers/mimetypes and early abort
+		if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
+			// Abort if not done already and return
+			return jqXHR.abort();
+		}
+
+		// aborting is no longer a cancellation
+		strAbort = "abort";
+
+		// Install callbacks on deferreds
+		for ( i in { success: 1, error: 1, complete: 1 } ) {
+			jqXHR[ i ]( s[ i ] );
+		}
+
+		// Get transport
+		transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
+
+		// If no transport, we auto-abort
+		if ( !transport ) {
+			done( -1, "No Transport" );
+		} else {
+			jqXHR.readyState = 1;
+
+			// Send global event
+			if ( fireGlobals ) {
+				globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
+			}
+			// Timeout
+			if ( s.async && s.timeout > 0 ) {
+				timeoutTimer = setTimeout(function() {
+					jqXHR.abort("timeout");
+				}, s.timeout );
+			}
+
+			try {
+				state = 1;
+				transport.send( requestHeaders, done );
+			} catch ( e ) {
+				// Propagate exception as error if not done
+				if ( state < 2 ) {
+					done( -1, e );
+				// Simply rethrow otherwise
+				} else {
+					throw e;
+				}
+			}
+		}
+
+		// Callback for when everything is done
+		function done( status, nativeStatusText, responses, headers ) {
+			var isSuccess, success, error, response, modified,
+				statusText = nativeStatusText;
+
+			// Called once
+			if ( state === 2 ) {
+				return;
+			}
+
+			// State is "done" now
+			state = 2;
+
+			// Clear timeout if it exists
+			if ( timeoutTimer ) {
+				clearTimeout( timeoutTimer );
+			}
+
+			// Dereference transport for early garbage collection
+			// (no matter how long the jqXHR object will be used)
+			transport = undefined;
+
+			// Cache response headers
+			responseHeadersString = headers || "";
+
+			// Set readyState
+			jqXHR.readyState = status > 0 ? 4 : 0;
+
+			// Determine if successful
+			isSuccess = status >= 200 && status < 300 || status === 304;
+
+			// Get response data
+			if ( responses ) {
+				response = ajaxHandleResponses( s, jqXHR, responses );
+			}
+
+			// Convert no matter what (that way responseXXX fields are always set)
+			response = ajaxConvert( s, response, jqXHR, isSuccess );
+
+			// If successful, handle type chaining
+			if ( isSuccess ) {
+
+				// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+				if ( s.ifModified ) {
+					modified = jqXHR.getResponseHeader("Last-Modified");
+					if ( modified ) {
+						jQuery.lastModified[ cacheURL ] = modified;
+					}
+					modified = jqXHR.getResponseHeader("etag");
+					if ( modified ) {
+						jQuery.etag[ cacheURL ] = modified;
+					}
+				}
+
+				// if no content
+				if ( status === 204 || s.type === "HEAD" ) {
+					statusText = "nocontent";
+
+				// if not modified
+				} else if ( status === 304 ) {
+					statusText = "notmodified";
+
+				// If we have data, let's convert it
+				} else {
+					statusText = response.state;
+					success = response.data;
+					error = response.error;
+					isSuccess = !error;
+				}
+			} else {
+				// We extract error from statusText
+				// then normalize statusText and status for non-aborts
+				error = statusText;
+				if ( status || !statusText ) {
+					statusText = "error";
+					if ( status < 0 ) {
+						status = 0;
+					}
+				}
+			}
+
+			// Set data for the fake xhr object
+			jqXHR.status = status;
+			jqXHR.statusText = ( nativeStatusText || statusText ) + "";
+
+			// Success/Error
+			if ( isSuccess ) {
+				deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
+			} else {
+				deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
+			}
+
+			// Status-dependent callbacks
+			jqXHR.statusCode( statusCode );
+			statusCode = undefined;
+
+			if ( fireGlobals ) {
+				globalEventContext.trigger( isSuccess ? "ajaxSuccess" : "ajaxError",
+					[ jqXHR, s, isSuccess ? success : error ] );
+			}
+
+			// Complete
+			completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );
+
+			if ( fireGlobals ) {
+				globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );
+				// Handle the global AJAX counter
+				if ( !( --jQuery.active ) ) {
+					jQuery.event.trigger("ajaxStop");
+				}
+			}
+		}
+
+		return jqXHR;
+	},
+
+	getJSON: function( url, data, callback ) {
+		return jQuery.get( url, data, callback, "json" );
+	},
+
+	getScript: function( url, callback ) {
+		return jQuery.get( url, undefined, callback, "script" );
+	}
+});
+
+jQuery.each( [ "get", "post" ], function( i, method ) {
+	jQuery[ method ] = function( url, data, callback, type ) {
+		// shift arguments if data argument was omitted
+		if ( jQuery.isFunction( data ) ) {
+			type = type || callback;
+			callback = data;
+			data = undefined;
+		}
+
+		return jQuery.ajax({
+			url: url,
+			type: method,
+			dataType: type,
+			data: data,
+			success: callback
+		});
+	};
+});
+
+// Attach a bunch of functions for handling common AJAX events
+jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ) {
+	jQuery.fn[ type ] = function( fn ) {
+		return this.on( type, fn );
+	};
+});
+
+
+jQuery._evalUrl = function( url ) {
+	return jQuery.ajax({
+		url: url,
+		type: "GET",
+		dataType: "script",
+		async: false,
+		global: false,
+		"throws": true
+	});
+};
+
+
+jQuery.fn.extend({
+	wrapAll: function( html ) {
+		var wrap;
+
+		if ( jQuery.isFunction( html ) ) {
+			return this.each(function( i ) {
+				jQuery( this ).wrapAll( html.call(this, i) );
+			});
+		}
+
+		if ( this[ 0 ] ) {
+
+			// The elements to wrap the target around
+			wrap = jQuery( html, this[ 0 ].ownerDocument ).eq( 0 ).clone( true );
+
+			if ( this[ 0 ].parentNode ) {
+				wrap.insertBefore( this[ 0 ] );
+			}
+
+			wrap.map(function() {
+				var elem = this;
+
+				while ( elem.firstElementChild ) {
+					elem = elem.firstElementChild;
+				}
+
+				return elem;
+			}).append( this );
+		}
+
+		return this;
+	},
+
+	wrapInner: function( html ) {
+		if ( jQuery.isFunction( html ) ) {
+			return this.each(function( i ) {
+				jQuery( this ).wrapInner( html.call(this, i) );
+			});
+		}
+
+		return this.each(function() {
+			var self = jQuery( this ),
+				contents = self.contents();
+
+			if ( contents.length ) {
+				contents.wrapAll( html );
+
+			} else {
+				self.append( html );
+			}
+		});
+	},
+
+	wrap: function( html ) {
+		var isFunction = jQuery.isFunction( html );
+
+		return this.each(function( i ) {
+			jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
+		});
+	},
+
+	unwrap: function() {
+		return this.parent().each(function() {
+			if ( !jQuery.nodeName( this, "body" ) ) {
+				jQuery( this ).replaceWith( this.childNodes );
+			}
+		}).end();
+	}
+});
+
+
+jQuery.expr.filters.hidden = function( elem ) {
+	// Support: Opera <= 12.12
+	// Opera reports offsetWidths and offsetHeights less than zero on some elements
+	return elem.offsetWidth <= 0 && elem.offsetHeight <= 0;
+};
+jQuery.expr.filters.visible = function( elem ) {
+	return !jQuery.expr.filters.hidden( elem );
+};
+
+
+
+
+var r20 = /%20/g,
+	rbracket = /\[\]$/,
+	rCRLF = /\r?\n/g,
+	rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i,
+	rsubmittable = /^(?:input|select|textarea|keygen)/i;
+
+function buildParams( prefix, obj, traditional, add ) {
+	var name;
+
+	if ( jQuery.isArray( obj ) ) {
+		// Serialize array item.
+		jQuery.each( obj, function( i, v ) {
+			if ( traditional || rbracket.test( prefix ) ) {
+				// Treat each array item as a scalar.
+				add( prefix, v );
+
+			} else {
+				// Item is non-scalar (array or object), encode its numeric index.
+				buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
+			}
+		});
+
+	} else if ( !traditional && jQuery.type( obj ) === "object" ) {
+		// Serialize object item.
+		for ( name in obj ) {
+			buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
+		}
+
+	} else {
+		// Serialize scalar item.
+		add( prefix, obj );
+	}
+}
+
+// Serialize an array of form elements or a set of
+// key/values into a query string
+jQuery.param = function( a, traditional ) {
+	var prefix,
+		s = [],
+		add = function( key, value ) {
+			// If value is a function, invoke it and return its value
+			value = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );
+			s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
+		};
+
+	// Set traditional to true for jQuery <= 1.3.2 behavior.
+	if ( traditional === undefined ) {
+		traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
+	}
+
+	// If an array was passed in, assume that it is an array of form elements.
+	if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
+		// Serialize the form elements
+		jQuery.each( a, function() {
+			add( this.name, this.value );
+		});
+
+	} else {
+		// If traditional, encode the "old" way (the way 1.3.2 or older
+		// did it), otherwise encode params recursively.
+		for ( prefix in a ) {
+			buildParams( prefix, a[ prefix ], traditional, add );
+		}
+	}
+
+	// Return the resulting serialization
+	return s.join( "&" ).replace( r20, "+" );
+};
+
+jQuery.fn.extend({
+	serialize: function() {
+		return jQuery.param( this.serializeArray() );
+	},
+	serializeArray: function() {
+		return this.map(function() {
+			// Can add propHook for "elements" to filter or add form elements
+			var elements = jQuery.prop( this, "elements" );
+			return elements ? jQuery.makeArray( elements ) : this;
+		})
+		.filter(function() {
+			var type = this.type;
+
+			// Use .is( ":disabled" ) so that fieldset[disabled] works
+			return this.name && !jQuery( this ).is( ":disabled" ) &&
+				rsubmittable.test( this.nodeName ) && !rsubmitterTypes.test( type ) &&
+				( this.checked || !rcheckableType.test( type ) );
+		})
+		.map(function( i, elem ) {
+			var val = jQuery( this ).val();
+
+			return val == null ?
+				null :
+				jQuery.isArray( val ) ?
+					jQuery.map( val, function( val ) {
+						return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
+					}) :
+					{ name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
+		}).get();
+	}
+});
+
+
+jQuery.ajaxSettings.xhr = function() {
+	try {
+		return new XMLHttpRequest();
+	} catch( e ) {}
+};
+
+var xhrId = 0,
+	xhrCallbacks = {},
+	xhrSuccessStatus = {
+		// file protocol always yields status code 0, assume 200
+		0: 200,
+		// Support: IE9
+		// #1450: sometimes IE returns 1223 when it should be 204
+		1223: 204
+	},
+	xhrSupported = jQuery.ajaxSettings.xhr();
+
+// Support: IE9
+// Open requests must be manually aborted on unload (#5280)
+if ( window.ActiveXObject ) {
+	jQuery( window ).on( "unload", function() {
+		for ( var key in xhrCallbacks ) {
+			xhrCallbacks[ key ]();
+		}
+	});
+}
+
+support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
+support.ajax = xhrSupported = !!xhrSupported;
+
+jQuery.ajaxTransport(function( options ) {
+	var callback;
+
+	// Cross domain only allowed if supported through XMLHttpRequest
+	if ( support.cors || xhrSupported && !options.crossDomain ) {
+		return {
+			send: function( headers, complete ) {
+				var i,
+					xhr = options.xhr(),
+					id = ++xhrId;
+
+				xhr.open( options.type, options.url, options.async, options.username, options.password );
+
+				// Apply custom fields if provided
+				if ( options.xhrFields ) {
+					for ( i in options.xhrFields ) {
+						xhr[ i ] = options.xhrFields[ i ];
+					}
+				}
+
+				// Override mime type if needed
+				if ( options.mimeType && xhr.overrideMimeType ) {
+					xhr.overrideMimeType( options.mimeType );
+				}
+
+				// X-Requested-With header
+				// For cross-domain requests, seeing as conditions for a preflight are
+				// akin to a jigsaw puzzle, we simply never set it to be sure.
+				// (it can always be set on a per-request basis or even using ajaxSetup)
+				// For same-domain requests, won't change header if already provided.
+				if ( !options.crossDomain && !headers["X-Requested-With"] ) {
+					headers["X-Requested-With"] = "XMLHttpRequest";
+				}
+
+				// Set headers
+				for ( i in headers ) {
+					xhr.setRequestHeader( i, headers[ i ] );
+				}
+
+				// Callback
+				callback = function( type ) {
+					return function() {
+						if ( callback ) {
+							delete xhrCallbacks[ id ];
+							callback = xhr.onload = xhr.onerror = null;
+
+							if ( type === "abort" ) {
+								xhr.abort();
+							} else if ( type === "error" ) {
+								complete(
+									// file: protocol always yields status 0; see #8605, #14207
+									xhr.status,
+									xhr.statusText
+								);
+							} else {
+								complete(
+									xhrSuccessStatus[ xhr.status ] || xhr.status,
+									xhr.statusText,
+									// Support: IE9
+									// Accessing binary-data responseText throws an exception
+									// (#11426)
+									typeof xhr.responseText === "string" ? {
+										text: xhr.responseText
+									} : undefined,
+									xhr.getAllResponseHeaders()
+								);
+							}
+						}
+					};
+				};
+
+				// Listen to events
+				xhr.onload = callback();
+				xhr.onerror = callback("error");
+
+				// Create the abort callback
+				callback = xhrCallbacks[ id ] = callback("abort");
+
+				try {
+					// Do send the request (this may raise an exception)
+					xhr.send( options.hasContent && options.data || null );
+				} catch ( e ) {
+					// #14683: Only rethrow if this hasn't been notified as an error yet
+					if ( callback ) {
+						throw e;
+					}
+				}
+			},
+
+			abort: function() {
+				if ( callback ) {
+					callback();
+				}
+			}
+		};
+	}
+});
+
+
+
+
+// Install script dataType
+jQuery.ajaxSetup({
+	accepts: {
+		script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
+	},
+	contents: {
+		script: /(?:java|ecma)script/
+	},
+	converters: {
+		"text script": function( text ) {
+			jQuery.globalEval( text );
+			return text;
+		}
+	}
+});
+
+// Handle cache's special case and crossDomain
+jQuery.ajaxPrefilter( "script", function( s ) {
+	if ( s.cache === undefined ) {
+		s.cache = false;
+	}
+	if ( s.crossDomain ) {
+		s.type = "GET";
+	}
+});
+
+// Bind script tag hack transport
+jQuery.ajaxTransport( "script", function( s ) {
+	// This transport only deals with cross domain requests
+	if ( s.crossDomain ) {
+		var script, callback;
+		return {
+			send: function( _, complete ) {
+				script = jQuery("<script>").prop({
+					async: true,
+					charset: s.scriptCharset,
+					src: s.url
+				}).on(
+					"load error",
+					callback = function( evt ) {
+						script.remove();
+						callback = null;
+						if ( evt ) {
+							complete( evt.type === "error" ? 404 : 200, evt.type );
+						}
+					}
+				);
+				document.head.appendChild( script[ 0 ] );
+			},
+			abort: function() {
+				if ( callback ) {
+					callback();
+				}
+			}
+		};
+	}
+});
+
+
+
+
+var oldCallbacks = [],
+	rjsonp = /(=)\?(?=&|$)|\?\?/;
+
+// Default jsonp settings
+jQuery.ajaxSetup({
+	jsonp: "callback",
+	jsonpCallback: function() {
+		var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( nonce++ ) );
+		this[ callback ] = true;
+		return callback;
+	}
+});
+
+// Detect, normalize options and install callbacks for jsonp requests
+jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
+
+	var callbackName, overwritten, responseContainer,
+		jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ?
+			"url" :
+			typeof s.data === "string" && !( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") && rjsonp.test( s.data ) && "data"
+		);
+
+	// Handle iff the expected data type is "jsonp" or we have a parameter to set
+	if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {
+
+		// Get callback name, remembering preexisting value associated with it
+		callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
+			s.jsonpCallback() :
+			s.jsonpCallback;
+
+		// Insert callback into url or form data
+		if ( jsonProp ) {
+			s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName );
+		} else if ( s.jsonp !== false ) {
+			s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
+		}
+
+		// Use data converter to retrieve json after script execution
+		s.converters["script json"] = function() {
+			if ( !responseContainer ) {
+				jQuery.error( callbackName + " was not called" );
+			}
+			return responseContainer[ 0 ];
+		};
+
+		// force json dataType
+		s.dataTypes[ 0 ] = "json";
+
+		// Install callback
+		overwritten = window[ callbackName ];
+		window[ callbackName ] = function() {
+			responseContainer = arguments;
+		};
+
+		// Clean-up function (fires after converters)
+		jqXHR.always(function() {
+			// Restore preexisting value
+			window[ callbackName ] = overwritten;
+
+			// Save back as free
+			if ( s[ callbackName ] ) {
+				// make sure that re-using the options doesn't screw things around
+				s.jsonpCallback = originalSettings.jsonpCallback;
+
+				// save the callback name for future use
+				oldCallbacks.push( callbackName );
+			}
+
+			// Call if it was a function and we have a response
+			if ( responseContainer && jQuery.isFunction( overwritten ) ) {
+				overwritten( responseContainer[ 0 ] );
+			}
+
+			responseContainer = overwritten = undefined;
+		});
+
+		// Delegate to script
+		return "script";
+	}
+});
+
+
+
+
+// data: string of html
+// context (optional): If specified, the fragment will be created in this context, defaults to document
+// keepScripts (optional): If true, will include scripts passed in the html string
+jQuery.parseHTML = function( data, context, keepScripts ) {
+	if ( !data || typeof data !== "string" ) {
+		return null;
+	}
+	if ( typeof context === "boolean" ) {
+		keepScripts = context;
+		context = false;
+	}
+	context = context || document;
+
+	var parsed = rsingleTag.exec( data ),
+		scripts = !keepScripts && [];
+
+	// Single tag
+	if ( parsed ) {
+		return [ context.createElement( parsed[1] ) ];
+	}
+
+	parsed = jQuery.buildFragment( [ data ], context, scripts );
+
+	if ( scripts && scripts.length ) {
+		jQuery( scripts ).remove();
+	}
+
+	return jQuery.merge( [], parsed.childNodes );
+};
+
+
+// Keep a copy of the old load method
+var _load = jQuery.fn.load;
+
+/**
+ * Load a url into a page
+ */
+jQuery.fn.load = function( url, params, callback ) {
+	if ( typeof url !== "string" && _load ) {
+		return _load.apply( this, arguments );
+	}
+
+	var selector, type, response,
+		self = this,
+		off = url.indexOf(" ");
+
+	if ( off >= 0 ) {
+		selector = jQuery.trim( url.slice( off ) );
+		url = url.slice( 0, off );
+	}
+
+	// If it's a function
+	if ( jQuery.isFunction( params ) ) {
+
+		// We assume that it's the callback
+		callback = params;
+		params = undefined;
+
+	// Otherwise, build a param string
+	} else if ( params && typeof params === "object" ) {
+		type = "POST";
+	}
+
+	// If we have elements to modify, make the request
+	if ( self.length > 0 ) {
+		jQuery.ajax({
+			url: url,
+
+			// if "type" variable is undefined, then "GET" method will be used
+			type: type,
+			dataType: "html",
+			data: params
+		}).done(function( responseText ) {
+
+			// Save response for use in complete callback
+			response = arguments;
+
+			self.html( selector ?
+
+				// If a selector was specified, locate the right elements in a dummy div
+				// Exclude scripts to avoid IE 'Permission Denied' errors
+				jQuery("<div>").append( jQuery.parseHTML( responseText ) ).find( selector ) :
+
+				// Otherwise use the full result
+				responseText );
+
+		}).complete( callback && function( jqXHR, status ) {
+			self.each( callback, response || [ jqXHR.responseText, status, jqXHR ] );
+		});
+	}
+
+	return this;
+};
+
+
+
+
+jQuery.expr.filters.animated = function( elem ) {
+	return jQuery.grep(jQuery.timers, function( fn ) {
+		return elem === fn.elem;
+	}).length;
+};
+
+
+
+
+var docElem = window.document.documentElement;
+
+/**
+ * Gets a window from an element
+ */
+function getWindow( elem ) {
+	return jQuery.isWindow( elem ) ? elem : elem.nodeType === 9 && elem.defaultView;
+}
+
+jQuery.offset = {
+	setOffset: function( elem, options, i ) {
+		var curPosition, curLeft, curCSSTop, curTop, curOffset, curCSSLeft, calculatePosition,
+			position = jQuery.css( elem, "position" ),
+			curElem = jQuery( elem ),
+			props = {};
+
+		// Set position first, in-case top/left are set even on static elem
+		if ( position === "static" ) {
+			elem.style.position = "relative";
+		}
+
+		curOffset = curElem.offset();
+		curCSSTop = jQuery.css( elem, "top" );
+		curCSSLeft = jQuery.css( elem, "left" );
+		calculatePosition = ( position === "absolute" || position === "fixed" ) &&
+			( curCSSTop + curCSSLeft ).indexOf("auto") > -1;
+
+		// Need to be able to calculate position if either top or left is auto and position is either absolute or fixed
+		if ( calculatePosition ) {
+			curPosition = curElem.position();
+			curTop = curPosition.top;
+			curLeft = curPosition.left;
+
+		} else {
+			curTop = parseFloat( curCSSTop ) || 0;
+			curLeft = parseFloat( curCSSLeft ) || 0;
+		}
+
+		if ( jQuery.isFunction( options ) ) {
+			options = options.call( elem, i, curOffset );
+		}
+
+		if ( options.top != null ) {
+			props.top = ( options.top - curOffset.top ) + curTop;
+		}
+		if ( options.left != null ) {
+			props.left = ( options.left - curOffset.left ) + curLeft;
+		}
+
+		if ( "using" in options ) {
+			options.using.call( elem, props );
+
+		} else {
+			curElem.css( props );
+		}
+	}
+};
+
+jQuery.fn.extend({
+	offset: function( options ) {
+		if ( arguments.length ) {
+			return options === undefined ?
+				this :
+				this.each(function( i ) {
+					jQuery.offset.setOffset( this, options, i );
+				});
+		}
+
+		var docElem, win,
+			elem = this[ 0 ],
+			box = { top: 0, left: 0 },
+			doc = elem && elem.ownerDocument;
+
+		if ( !doc ) {
+			return;
+		}
+
+		docElem = doc.documentElement;
+
+		// Make sure it's not a disconnected DOM node
+		if ( !jQuery.contains( docElem, elem ) ) {
+			return box;
+		}
+
+		// If we don't have gBCR, just use 0,0 rather than error
+		// BlackBerry 5, iOS 3 (original iPhone)
+		if ( typeof elem.getBoundingClientRect !== strundefined ) {
+			box = elem.getBoundingClientRect();
+		}
+		win = getWindow( doc );
+		return {
+			top: box.top + win.pageYOffset - docElem.clientTop,
+			left: box.left + win.pageXOffset - docElem.clientLeft
+		};
+	},
+
+	position: function() {
+		if ( !this[ 0 ] ) {
+			return;
+		}
+
+		var offsetParent, offset,
+			elem = this[ 0 ],
+			parentOffset = { top: 0, left: 0 };
+
+		// Fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is its only offset parent
+		if ( jQuery.css( elem, "position" ) === "fixed" ) {
+			// We assume that getBoundingClientRect is available when computed position is fixed
+			offset = elem.getBoundingClientRect();
+
+		} else {
+			// Get *real* offsetParent
+			offsetParent = this.offsetParent();
+
+			// Get correct offsets
+			offset = this.offset();
+			if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
+				parentOffset = offsetParent.offset();
+			}
+
+			// Add offsetParent borders
+			parentOffset.top += jQuery.css( offsetParent[ 0 ], "borderTopWidth", true );
+			parentOffset.left += jQuery.css( offsetParent[ 0 ], "borderLeftWidth", true );
+		}
+
+		// Subtract parent offsets and element margins
+		return {
+			top: offset.top - parentOffset.top - jQuery.css( elem, "marginTop", true ),
+			left: offset.left - parentOffset.left - jQuery.css( elem, "marginLeft", true )
+		};
+	},
+
+	offsetParent: function() {
+		return this.map(function() {
+			var offsetParent = this.offsetParent || docElem;
+
+			while ( offsetParent && ( !jQuery.nodeName( offsetParent, "html" ) && jQuery.css( offsetParent, "position" ) === "static" ) ) {
+				offsetParent = offsetParent.offsetParent;
+			}
+
+			return offsetParent || docElem;
+		});
+	}
+});
+
+// Create scrollLeft and scrollTop methods
+jQuery.each( { scrollLeft: "pageXOffset", scrollTop: "pageYOffset" }, function( method, prop ) {
+	var top = "pageYOffset" === prop;
+
+	jQuery.fn[ method ] = function( val ) {
+		return access( this, function( elem, method, val ) {
+			var win = getWindow( elem );
+
+			if ( val === undefined ) {
+				return win ? win[ prop ] : elem[ method ];
+			}
+
+			if ( win ) {
+				win.scrollTo(
+					!top ? val : window.pageXOffset,
+					top ? val : window.pageYOffset
+				);
+
+			} else {
+				elem[ method ] = val;
+			}
+		}, method, val, arguments.length, null );
+	};
+});
+
+// Add the top/left cssHooks using jQuery.fn.position
+// Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084
+// getComputedStyle returns percent when specified for top/left/bottom/right
+// rather than make the css module depend on the offset module, we just check for it here
+jQuery.each( [ "top", "left" ], function( i, prop ) {
+	jQuery.cssHooks[ prop ] = addGetHookIf( support.pixelPosition,
+		function( elem, computed ) {
+			if ( computed ) {
+				computed = curCSS( elem, prop );
+				// if curCSS returns percentage, fallback to offset
+				return rnumnonpx.test( computed ) ?
+					jQuery( elem ).position()[ prop ] + "px" :
+					computed;
+			}
+		}
+	);
+});
+
+
+// Create innerHeight, innerWidth, height, width, outerHeight and outerWidth methods
+jQuery.each( { Height: "height", Width: "width" }, function( name, type ) {
+	jQuery.each( { padding: "inner" + name, content: type, "": "outer" + name }, function( defaultExtra, funcName ) {
+		// margin is only for outerHeight, outerWidth
+		jQuery.fn[ funcName ] = function( margin, value ) {
+			var chainable = arguments.length && ( defaultExtra || typeof margin !== "boolean" ),
+				extra = defaultExtra || ( margin === true || value === true ? "margin" : "border" );
+
+			return access( this, function( elem, type, value ) {
+				var doc;
+
+				if ( jQuery.isWindow( elem ) ) {
+					// As of 5/8/2012 this will yield incorrect results for Mobile Safari, but there
+					// isn't a whole lot we can do. See pull request at this URL for discussion:
+					// https://github.com/jquery/jquery/pull/764
+					return elem.document.documentElement[ "client" + name ];
+				}
+
+				// Get document width or height
+				if ( elem.nodeType === 9 ) {
+					doc = elem.documentElement;
+
+					// Either scroll[Width/Height] or offset[Width/Height] or client[Width/Height],
+					// whichever is greatest
+					return Math.max(
+						elem.body[ "scroll" + name ], doc[ "scroll" + name ],
+						elem.body[ "offset" + name ], doc[ "offset" + name ],
+						doc[ "client" + name ]
+					);
+				}
+
+				return value === undefined ?
+					// Get width or height on the element, requesting but not forcing parseFloat
+					jQuery.css( elem, type, extra ) :
+
+					// Set width or height on the element
+					jQuery.style( elem, type, value, extra );
+			}, type, chainable ? margin : undefined, chainable, null );
+		};
+	});
+});
+
+
+// The number of elements contained in the matched element set
+jQuery.fn.size = function() {
+	return this.length;
+};
+
+jQuery.fn.andSelf = jQuery.fn.addBack;
+
+
+
+
+// Register as a named AMD module, since jQuery can be concatenated with other
+// files that may use define, but not via a proper concatenation script that
+// understands anonymous AMD modules. A named AMD is safest and most robust
+// way to register. Lowercase jquery is used because AMD module names are
+// derived from file names, and jQuery is normally delivered in a lowercase
+// file name. Do this after creating the global so that if an AMD module wants
+// to call noConflict to hide this version of jQuery, it will work.
+
+// Note that for maximum portability, libraries that are not jQuery should
+// declare themselves as anonymous modules, and avoid setting a global if an
+// AMD loader is present. jQuery is a special case. For more information, see
+// https://github.com/jrburke/requirejs/wiki/Updating-existing-libraries#wiki-anon
+
+if ( typeof define === "function" && define.amd ) {
+	define( "jquery", [], function() {
+		return jQuery;
+	});
+}
+
+
+
+
+var
+	// Map over jQuery in case of overwrite
+	_jQuery = window.jQuery,
+
+	// Map over the $ in case of overwrite
+	_$ = window.$;
+
+jQuery.noConflict = function( deep ) {
+	if ( window.$ === jQuery ) {
+		window.$ = _$;
+	}
+
+	if ( deep && window.jQuery === jQuery ) {
+		window.jQuery = _jQuery;
+	}
+
+	return jQuery;
+};
+
+// Expose jQuery and $ identifiers, even in
+// AMD (#7102#comment:10, https://github.com/jquery/jquery/pull/557)
+// and CommonJS for browser emulators (#13566)
+if ( typeof noGlobal === strundefined ) {
+	window.jQuery = window.$ = jQuery;
+}
+
+
+
+
+return jQuery;
+
+}));
diff --git a/packages/context-coloring/benchmark/fixtures/lodash-2.4.1.js b/packages/context-coloring/benchmark/fixtures/lodash-2.4.1.js
new file mode 100644
index 0000000..d653e5a
--- /dev/null
+++ b/packages/context-coloring/benchmark/fixtures/lodash-2.4.1.js
@@ -0,0 +1,6785 @@
+/**
+ * @license
+ * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
+ * Build: `lodash modern -o ./dist/lodash.js`
+ * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
+ * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
+ * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Available under MIT license <http://lodash.com/license>
+ */
+;(function() {
+
+  /** Used as a safe reference for `undefined` in pre ES5 environments */
+  var undefined;
+
+  /** Used to pool arrays and objects used internally */
+  var arrayPool = [],
+      objectPool = [];
+
+  /** Used to generate unique IDs */
+  var idCounter = 0;
+
+  /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */
+  var keyPrefix = +new Date + '';
+
+  /** Used as the size when optimizations are enabled for large arrays */
+  var largeArraySize = 75;
+
+  /** Used as the max size of the `arrayPool` and `objectPool` */
+  var maxPoolSize = 40;
+
+  /** Used to detect and test whitespace */
+  var whitespace = (
+    // whitespace
+    ' \t\x0B\f\xA0\ufeff' +
+
+    // line terminators
+    '\n\r\u2028\u2029' +
+
+    // unicode category "Zs" space separators
+    '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
+  );
+
+  /** Used to match empty string literals in compiled template source */
+  var reEmptyStringLeading = /\b__p \+= '';/g,
+      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
+      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
+
+  /**
+   * Used to match ES6 template delimiters
+   * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-string-literals
+   */
+  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
+
+  /** Used to match regexp flags from their coerced string values */
+  var reFlags = /\w*$/;
+
+  /** Used to detected named functions */
+  var reFuncName = /^\s*function[ \n\r\t]+\w/;
+
+  /** Used to match "interpolate" template delimiters */
+  var reInterpolate = /<%=([\s\S]+?)%>/g;
+
+  /** Used to match leading whitespace and zeros to be removed */
+  var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)');
+
+  /** Used to ensure capturing order of template delimiters */
+  var reNoMatch = /($^)/;
+
+  /** Used to detect functions containing a `this` reference */
+  var reThis = /\bthis\b/;
+
+  /** Used to match unescaped characters in compiled string literals */
+  var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
+
+  /** Used to assign default `context` object properties */
+  var contextProps = [
+    'Array', 'Boolean', 'Date', 'Function', 'Math', 'Number', 'Object',
+    'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN',
+    'parseInt', 'setTimeout'
+  ];
+
+  /** Used to make template sourceURLs easier to identify */
+  var templateCounter = 0;
+
+  /** `Object#toString` result shortcuts */
+  var argsClass = '[object Arguments]',
+      arrayClass = '[object Array]',
+      boolClass = '[object Boolean]',
+      dateClass = '[object Date]',
+      funcClass = '[object Function]',
+      numberClass = '[object Number]',
+      objectClass = '[object Object]',
+      regexpClass = '[object RegExp]',
+      stringClass = '[object String]';
+
+  /** Used to identify object classifications that `_.clone` supports */
+  var cloneableClasses = {};
+  cloneableClasses[funcClass] = false;
+  cloneableClasses[argsClass] = cloneableClasses[arrayClass] =
+  cloneableClasses[boolClass] = cloneableClasses[dateClass] =
+  cloneableClasses[numberClass] = cloneableClasses[objectClass] =
+  cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true;
+
+  /** Used as an internal `_.debounce` options object */
+  var debounceOptions = {
+    'leading': false,
+    'maxWait': 0,
+    'trailing': false
+  };
+
+  /** Used as the property descriptor for `__bindData__` */
+  var descriptor = {
+    'configurable': false,
+    'enumerable': false,
+    'value': null,
+    'writable': false
+  };
+
+  /** Used to determine if values are of the language type Object */
+  var objectTypes = {
+    'boolean': false,
+    'function': true,
+    'object': true,
+    'number': false,
+    'string': false,
+    'undefined': false
+  };
+
+  /** Used to escape characters for inclusion in compiled string literals */
+  var stringEscapes = {
+    '\\': '\\',
+    "'": "'",
+    '\n': 'n',
+    '\r': 'r',
+    '\t': 't',
+    '\u2028': 'u2028',
+    '\u2029': 'u2029'
+  };
+
+  /** Used as a reference to the global object */
+  var root = (objectTypes[typeof window] && window) || this;
+
+  /** Detect free variable `exports` */
+  var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
+
+  /** Detect free variable `module` */
+  var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;
+
+  /** Detect the popular CommonJS extension `module.exports` */
+  var moduleExports = freeModule && freeModule.exports === freeExports && freeExports;
+
+  /** Detect free variable `global` from Node.js or Browserified code and use it as `root` */
+  var freeGlobal = objectTypes[typeof global] && global;
+  if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {
+    root = freeGlobal;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * The base implementation of `_.indexOf` without support for binary searches
+   * or `fromIndex` constraints.
+   *
+   * @private
+   * @param {Array} array The array to search.
+   * @param {*} value The value to search for.
+   * @param {number} [fromIndex=0] The index to search from.
+   * @returns {number} Returns the index of the matched value or `-1`.
+   */
+  function baseIndexOf(array, value, fromIndex) {
+    var index = (fromIndex || 0) - 1,
+        length = array ? array.length : 0;
+
+    while (++index < length) {
+      if (array[index] === value) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
+  /**
+   * An implementation of `_.contains` for cache objects that mimics the return
+   * signature of `_.indexOf` by returning `0` if the value is found, else `-1`.
+   *
+   * @private
+   * @param {Object} cache The cache object to inspect.
+   * @param {*} value The value to search for.
+   * @returns {number} Returns `0` if `value` is found, else `-1`.
+   */
+  function cacheIndexOf(cache, value) {
+    var type = typeof value;
+    cache = cache.cache;
+
+    if (type == 'boolean' || value == null) {
+      return cache[value] ? 0 : -1;
+    }
+    if (type != 'number' && type != 'string') {
+      type = 'object';
+    }
+    var key = type == 'number' ? value : keyPrefix + value;
+    cache = (cache = cache[type]) && cache[key];
+
+    return type == 'object'
+      ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1)
+      : (cache ? 0 : -1);
+  }
+
+  /**
+   * Adds a given value to the corresponding cache object.
+   *
+   * @private
+   * @param {*} value The value to add to the cache.
+   */
+  function cachePush(value) {
+    var cache = this.cache,
+        type = typeof value;
+
+    if (type == 'boolean' || value == null) {
+      cache[value] = true;
+    } else {
+      if (type != 'number' && type != 'string') {
+        type = 'object';
+      }
+      var key = type == 'number' ? value : keyPrefix + value,
+          typeCache = cache[type] || (cache[type] = {});
+
+      if (type == 'object') {
+        (typeCache[key] || (typeCache[key] = [])).push(value);
+      } else {
+        typeCache[key] = true;
+      }
+    }
+  }
+
+  /**
+   * Used by `_.max` and `_.min` as the default callback when a given
+   * collection is a string value.
+   *
+   * @private
+   * @param {string} value The character to inspect.
+   * @returns {number} Returns the code unit of given character.
+   */
+  function charAtCallback(value) {
+    return value.charCodeAt(0);
+  }
+
+  /**
+   * Used by `sortBy` to compare transformed `collection` elements, stable sorting
+   * them in ascending order.
+   *
+   * @private
+   * @param {Object} a The object to compare to `b`.
+   * @param {Object} b The object to compare to `a`.
+   * @returns {number} Returns the sort order indicator of `1` or `-1`.
+   */
+  function compareAscending(a, b) {
+    var ac = a.criteria,
+        bc = b.criteria,
+        index = -1,
+        length = ac.length;
+
+    while (++index < length) {
+      var value = ac[index],
+          other = bc[index];
+
+      if (value !== other) {
+        if (value > other || typeof value == 'undefined') {
+          return 1;
+        }
+        if (value < other || typeof other == 'undefined') {
+          return -1;
+        }
+      }
+    }
+    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+    // that causes it, under certain circumstances, to return the same value for
+    // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247
+    //
+    // This also ensures a stable sort in V8 and other engines.
+    // See http://code.google.com/p/v8/issues/detail?id=90
+    return a.index - b.index;
+  }
+
+  /**
+   * Creates a cache object to optimize linear searches of large arrays.
+   *
+   * @private
+   * @param {Array} [array=[]] The array to search.
+   * @returns {null|Object} Returns the cache object or `null` if caching should not be used.
+   */
+  function createCache(array) {
+    var index = -1,
+        length = array.length,
+        first = array[0],
+        mid = array[(length / 2) | 0],
+        last = array[length - 1];
+
+    if (first && typeof first == 'object' &&
+        mid && typeof mid == 'object' && last && typeof last == 'object') {
+      return false;
+    }
+    var cache = getObject();
+    cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;
+
+    var result = getObject();
+    result.array = array;
+    result.cache = cache;
+    result.push = cachePush;
+
+    while (++index < length) {
+      result.push(array[index]);
+    }
+    return result;
+  }
+
+  /**
+   * Used by `template` to escape characters for inclusion in compiled
+   * string literals.
+   *
+   * @private
+   * @param {string} match The matched character to escape.
+   * @returns {string} Returns the escaped character.
+   */
+  function escapeStringChar(match) {
+    return '\\' + stringEscapes[match];
+  }
+
+  /**
+   * Gets an array from the array pool or creates a new one if the pool is empty.
+   *
+   * @private
+   * @returns {Array} The array from the pool.
+   */
+  function getArray() {
+    return arrayPool.pop() || [];
+  }
+
+  /**
+   * Gets an object from the object pool or creates a new one if the pool is empty.
+   *
+   * @private
+   * @returns {Object} The object from the pool.
+   */
+  function getObject() {
+    return objectPool.pop() || {
+      'array': null,
+      'cache': null,
+      'criteria': null,
+      'false': false,
+      'index': 0,
+      'null': false,
+      'number': null,
+      'object': null,
+      'push': null,
+      'string': null,
+      'true': false,
+      'undefined': false,
+      'value': null
+    };
+  }
+
+  /**
+   * Releases the given array back to the array pool.
+   *
+   * @private
+   * @param {Array} [array] The array to release.
+   */
+  function releaseArray(array) {
+    array.length = 0;
+    if (arrayPool.length < maxPoolSize) {
+      arrayPool.push(array);
+    }
+  }
+
+  /**
+   * Releases the given object back to the object pool.
+   *
+   * @private
+   * @param {Object} [object] The object to release.
+   */
+  function releaseObject(object) {
+    var cache = object.cache;
+    if (cache) {
+      releaseObject(cache);
+    }
+    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
+    if (objectPool.length < maxPoolSize) {
+      objectPool.push(object);
+    }
+  }
+
+  /**
+   * Slices the `collection` from the `start` index up to, but not including,
+   * the `end` index.
+   *
+   * Note: This function is used instead of `Array#slice` to support node lists
+   * in IE < 9 and to ensure dense arrays are returned.
+   *
+   * @private
+   * @param {Array|Object|string} collection The collection to slice.
+   * @param {number} start The start index.
+   * @param {number} end The end index.
+   * @returns {Array} Returns the new array.
+   */
+  function slice(array, start, end) {
+    start || (start = 0);
+    if (typeof end == 'undefined') {
+      end = array ? array.length : 0;
+    }
+    var index = -1,
+        length = end - start || 0,
+        result = Array(length < 0 ? 0 : length);
+
+    while (++index < length) {
+      result[index] = array[start + index];
+    }
+    return result;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * Create a new `lodash` function using the given context object.
+   *
+   * @static
+   * @memberOf _
+   * @category Utilities
+   * @param {Object} [context=root] The context object.
+   * @returns {Function} Returns the `lodash` function.
+   */
+  function runInContext(context) {
+    // Avoid issues with some ES3 environments that attempt to use values, named
+    // after built-in constructors like `Object`, for the creation of literals.
+    // ES5 clears this up by stating that literals must use built-in constructors.
+    // See http://es5.github.io/#x11.1.5.
+    context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root;
+
+    /** Native constructor references */
+    var Array = context.Array,
+        Boolean = context.Boolean,
+        Date = context.Date,
+        Function = context.Function,
+        Math = context.Math,
+        Number = context.Number,
+        Object = context.Object,
+        RegExp = context.RegExp,
+        String = context.String,
+        TypeError = context.TypeError;
+
+    /**
+     * Used for `Array` method references.
+     *
+     * Normally `Array.prototype` would suffice, however, using an array literal
+     * avoids issues in Narwhal.
+     */
+    var arrayRef = [];
+
+    /** Used for native method references */
+    var objectProto = Object.prototype;
+
+    /** Used to restore the original `_` reference in `noConflict` */
+    var oldDash = context._;
+
+    /** Used to resolve the internal [[Class]] of values */
+    var toString = objectProto.toString;
+
+    /** Used to detect if a method is native */
+    var reNative = RegExp('^' +
+      String(toString)
+        .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+        .replace(/toString| for [^\]]+/g, '.*?') + '$'
+    );
+
+    /** Native method shortcuts */
+    var ceil = Math.ceil,
+        clearTimeout = context.clearTimeout,
+        floor = Math.floor,
+        fnToString = Function.prototype.toString,
+        getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
+        hasOwnProperty = objectProto.hasOwnProperty,
+        push = arrayRef.push,
+        setTimeout = context.setTimeout,
+        splice = arrayRef.splice,
+        unshift = arrayRef.unshift;
+
+    /** Used to set meta data on functions */
+    var defineProperty = (function() {
+      // IE 8 only accepts DOM elements
+      try {
+        var o = {},
+            func = isNative(func = Object.defineProperty) && func,
+            result = func(o, o, o) && func;
+      } catch(e) { }
+      return result;
+    }());
+
+    /* Native method shortcuts for methods with the same name as other `lodash` methods */
+    var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
+        nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
+        nativeIsFinite = context.isFinite,
+        nativeIsNaN = context.isNaN,
+        nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
+        nativeMax = Math.max,
+        nativeMin = Math.min,
+        nativeParseInt = context.parseInt,
+        nativeRandom = Math.random;
+
+    /** Used to lookup a built-in constructor by [[Class]] */
+    var ctorByClass = {};
+    ctorByClass[arrayClass] = Array;
+    ctorByClass[boolClass] = Boolean;
+    ctorByClass[dateClass] = Date;
+    ctorByClass[funcClass] = Function;
+    ctorByClass[objectClass] = Object;
+    ctorByClass[numberClass] = Number;
+    ctorByClass[regexpClass] = RegExp;
+    ctorByClass[stringClass] = String;
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates a `lodash` object which wraps the given value to enable intuitive
+     * method chaining.
+     *
+     * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
+     * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
+     * and `unshift`
+     *
+     * Chaining is supported in custom builds as long as the `value` method is
+     * implicitly or explicitly included in the build.
+     *
+     * The chainable wrapper functions are:
+     * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,
+     * `compose`, `concat`, `countBy`, `create`, `createCallback`, `curry`,
+     * `debounce`, `defaults`, `defer`, `delay`, `difference`, `filter`, `flatten`,
+     * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`,
+     * `functions`, `groupBy`, `indexBy`, `initial`, `intersection`, `invert`,
+     * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`,
+     * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `pull`, `push`,
+     * `range`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`,
+     * `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`, `transform`,
+     * `union`, `uniq`, `unshift`, `unzip`, `values`, `where`, `without`, `wrap`,
+     * and `zip`
+     *
+     * The non-chainable wrapper functions are:
+     * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `findIndex`,
+     * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `has`, `identity`,
+     * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`,
+     * `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`,
+     * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`,
+     * `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, `pop`, `random`, `reduce`,
+     * `reduceRight`, `result`, `shift`, `size`, `some`, `sortedIndex`, `runInContext`,
+     * `template`, `unescape`, `uniqueId`, and `value`
+     *
+     * The wrapper functions `first` and `last` return wrapped values when `n` is
+     * provided, otherwise they return unwrapped values.
+     *
+     * Explicit chaining can be enabled by using the `_.chain` method.
+     *
+     * @name _
+     * @constructor
+     * @category Chaining
+     * @param {*} value The value to wrap in a `lodash` instance.
+     * @returns {Object} Returns a `lodash` instance.
+     * @example
+     *
+     * var wrapped = _([1, 2, 3]);
+     *
+     * // returns an unwrapped value
+     * wrapped.reduce(function(sum, num) {
+     *   return sum + num;
+     * });
+     * // => 6
+     *
+     * // returns a wrapped value
+     * var squares = wrapped.map(function(num) {
+     *   return num * num;
+     * });
+     *
+     * _.isArray(squares);
+     * // => false
+     *
+     * _.isArray(squares.value());
+     * // => true
+     */
+    function lodash(value) {
+      // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor
+      return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__'))
+       ? value
+       : new lodashWrapper(value);
+    }
+
+    /**
+     * A fast path for creating `lodash` wrapper objects.
+     *
+     * @private
+     * @param {*} value The value to wrap in a `lodash` instance.
+     * @param {boolean} chainAll A flag to enable chaining for all methods
+     * @returns {Object} Returns a `lodash` instance.
+     */
+    function lodashWrapper(value, chainAll) {
+      this.__chain__ = !!chainAll;
+      this.__wrapped__ = value;
+    }
+    // ensure `new lodashWrapper` is an instance of `lodash`
+    lodashWrapper.prototype = lodash.prototype;
+
+    /**
+     * An object used to flag environments features.
+     *
+     * @static
+     * @memberOf _
+     * @type Object
+     */
+    var support = lodash.support = {};
+
+    /**
+     * Detect if functions can be decompiled by `Function#toString`
+     * (all but PS3 and older Opera mobile browsers & avoided in Windows 8 apps).
+     *
+     * @memberOf _.support
+     * @type boolean
+     */
+    support.funcDecomp = !isNative(context.WinRTError) && reThis.test(runInContext);
+
+    /**
+     * Detect if `Function#name` is supported (all but IE).
+     *
+     * @memberOf _.support
+     * @type boolean
+     */
+    support.funcNames = typeof Function.name == 'string';
+
+    /**
+     * By default, the template delimiters used by Lo-Dash are similar to those in
+     * embedded Ruby (ERB). Change the following template settings to use alternative
+     * delimiters.
+     *
+     * @static
+     * @memberOf _
+     * @type Object
+     */
+    lodash.templateSettings = {
+
+      /**
+       * Used to detect `data` property values to be HTML-escaped.
+       *
+       * @memberOf _.templateSettings
+       * @type RegExp
+       */
+      'escape': /<%-([\s\S]+?)%>/g,
+
+      /**
+       * Used to detect code to be evaluated.
+       *
+       * @memberOf _.templateSettings
+       * @type RegExp
+       */
+      'evaluate': /<%([\s\S]+?)%>/g,
+
+      /**
+       * Used to detect `data` property values to inject.
+       *
+       * @memberOf _.templateSettings
+       * @type RegExp
+       */
+      'interpolate': reInterpolate,
+
+      /**
+       * Used to reference the data object in the template text.
+       *
+       * @memberOf _.templateSettings
+       * @type string
+       */
+      'variable': '',
+
+      /**
+       * Used to import variables into the compiled template.
+       *
+       * @memberOf _.templateSettings
+       * @type Object
+       */
+      'imports': {
+
+        /**
+         * A reference to the `lodash` function.
+         *
+         * @memberOf _.templateSettings.imports
+         * @type Function
+         */
+        '_': lodash
+      }
+    };
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * The base implementation of `_.bind` that creates the bound function and
+     * sets its meta data.
+     *
+     * @private
+     * @param {Array} bindData The bind data array.
+     * @returns {Function} Returns the new bound function.
+     */
+    function baseBind(bindData) {
+      var func = bindData[0],
+          partialArgs = bindData[2],
+          thisArg = bindData[4];
+
+      function bound() {
+        // `Function#bind` spec
+        // http://es5.github.io/#x15.3.4.5
+        if (partialArgs) {
+          // avoid `arguments` object deoptimizations by using `slice` instead
+          // of `Array.prototype.slice.call` and not assigning `arguments` to a
+          // variable as a ternary expression
+          var args = slice(partialArgs);
+          push.apply(args, arguments);
+        }
+        // mimic the constructor's `return` behavior
+        // http://es5.github.io/#x13.2.2
+        if (this instanceof bound) {
+          // ensure `new bound` is an instance of `func`
+          var thisBinding = baseCreate(func.prototype),
+              result = func.apply(thisBinding, args || arguments);
+          return isObject(result) ? result : thisBinding;
+        }
+        return func.apply(thisArg, args || arguments);
+      }
+      setBindData(bound, bindData);
+      return bound;
+    }
+
+    /**
+     * The base implementation of `_.clone` without argument juggling or support
+     * for `thisArg` binding.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @param {Function} [callback] The function to customize cloning values.
+     * @param {Array} [stackA=[]] Tracks traversed source objects.
+     * @param {Array} [stackB=[]] Associates clones with source counterparts.
+     * @returns {*} Returns the cloned value.
+     */
+    function baseClone(value, isDeep, callback, stackA, stackB) {
+      if (callback) {
+        var result = callback(value);
+        if (typeof result != 'undefined') {
+          return result;
+        }
+      }
+      // inspect [[Class]]
+      var isObj = isObject(value);
+      if (isObj) {
+        var className = toString.call(value);
+        if (!cloneableClasses[className]) {
+          return value;
+        }
+        var ctor = ctorByClass[className];
+        switch (className) {
+          case boolClass:
+          case dateClass:
+            return new ctor(+value);
+
+          case numberClass:
+          case stringClass:
+            return new ctor(value);
+
+          case regexpClass:
+            result = ctor(value.source, reFlags.exec(value));
+            result.lastIndex = value.lastIndex;
+            return result;
+        }
+      } else {
+        return value;
+      }
+      var isArr = isArray(value);
+      if (isDeep) {
+        // check for circular references and return corresponding clone
+        var initedStack = !stackA;
+        stackA || (stackA = getArray());
+        stackB || (stackB = getArray());
+
+        var length = stackA.length;
+        while (length--) {
+          if (stackA[length] == value) {
+            return stackB[length];
+          }
+        }
+        result = isArr ? ctor(value.length) : {};
+      }
+      else {
+        result = isArr ? slice(value) : assign({}, value);
+      }
+      // add array properties assigned by `RegExp#exec`
+      if (isArr) {
+        if (hasOwnProperty.call(value, 'index')) {
+          result.index = value.index;
+        }
+        if (hasOwnProperty.call(value, 'input')) {
+          result.input = value.input;
+        }
+      }
+      // exit for shallow clone
+      if (!isDeep) {
+        return result;
+      }
+      // add the source value to the stack of traversed objects
+      // and associate it with its clone
+      stackA.push(value);
+      stackB.push(result);
+
+      // recursively populate clone (susceptible to call stack limits)
+      (isArr ? forEach : forOwn)(value, function(objValue, key) {
+        result[key] = baseClone(objValue, isDeep, callback, stackA, stackB);
+      });
+
+      if (initedStack) {
+        releaseArray(stackA);
+        releaseArray(stackB);
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.create` without support for assigning
+     * properties to the created object.
+     *
+     * @private
+     * @param {Object} prototype The object to inherit from.
+     * @returns {Object} Returns the new object.
+     */
+    function baseCreate(prototype, properties) {
+      return isObject(prototype) ? nativeCreate(prototype) : {};
+    }
+    // fallback for browsers without `Object.create`
+    if (!nativeCreate) {
+      baseCreate = (function() {
+        function Object() {}
+        return function(prototype) {
+          if (isObject(prototype)) {
+            Object.prototype = prototype;
+            var result = new Object;
+            Object.prototype = null;
+          }
+          return result || context.Object();
+        };
+      }());
+    }
+
+    /**
+     * The base implementation of `_.createCallback` without support for creating
+     * "_.pluck" or "_.where" style callbacks.
+     *
+     * @private
+     * @param {*} [func=identity] The value to convert to a callback.
+     * @param {*} [thisArg] The `this` binding of the created callback.
+     * @param {number} [argCount] The number of arguments the callback accepts.
+     * @returns {Function} Returns a callback function.
+     */
+    function baseCreateCallback(func, thisArg, argCount) {
+      if (typeof func != 'function') {
+        return identity;
+      }
+      // exit early for no `thisArg` or already bound by `Function#bind`
+      if (typeof thisArg == 'undefined' || !('prototype' in func)) {
+        return func;
+      }
+      var bindData = func.__bindData__;
+      if (typeof bindData == 'undefined') {
+        if (support.funcNames) {
+          bindData = !func.name;
+        }
+        bindData = bindData || !support.funcDecomp;
+        if (!bindData) {
+          var source = fnToString.call(func);
+          if (!support.funcNames) {
+            bindData = !reFuncName.test(source);
+          }
+          if (!bindData) {
+            // checks if `func` references the `this` keyword and stores the result
+            bindData = reThis.test(source);
+            setBindData(func, bindData);
+          }
+        }
+      }
+      // exit early if there are no `this` references or `func` is bound
+      if (bindData === false || (bindData !== true && bindData[1] & 1)) {
+        return func;
+      }
+      switch (argCount) {
+        case 1: return function(value) {
+          return func.call(thisArg, value);
+        };
+        case 2: return function(a, b) {
+          return func.call(thisArg, a, b);
+        };
+        case 3: return function(value, index, collection) {
+          return func.call(thisArg, value, index, collection);
+        };
+        case 4: return function(accumulator, value, index, collection) {
+          return func.call(thisArg, accumulator, value, index, collection);
+        };
+      }
+      return bind(func, thisArg);
+    }
+
+    /**
+     * The base implementation of `createWrapper` that creates the wrapper and
+     * sets its meta data.
+     *
+     * @private
+     * @param {Array} bindData The bind data array.
+     * @returns {Function} Returns the new function.
+     */
+    function baseCreateWrapper(bindData) {
+      var func = bindData[0],
+          bitmask = bindData[1],
+          partialArgs = bindData[2],
+          partialRightArgs = bindData[3],
+          thisArg = bindData[4],
+          arity = bindData[5];
+
+      var isBind = bitmask & 1,
+          isBindKey = bitmask & 2,
+          isCurry = bitmask & 4,
+          isCurryBound = bitmask & 8,
+          key = func;
+
+      function bound() {
+        var thisBinding = isBind ? thisArg : this;
+        if (partialArgs) {
+          var args = slice(partialArgs);
+          push.apply(args, arguments);
+        }
+        if (partialRightArgs || isCurry) {
+          args || (args = slice(arguments));
+          if (partialRightArgs) {
+            push.apply(args, partialRightArgs);
+          }
+          if (isCurry && args.length < arity) {
+            bitmask |= 16 & ~32;
+            return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity]);
+          }
+        }
+        args || (args = arguments);
+        if (isBindKey) {
+          func = thisBinding[key];
+        }
+        if (this instanceof bound) {
+          thisBinding = baseCreate(func.prototype);
+          var result = func.apply(thisBinding, args);
+          return isObject(result) ? result : thisBinding;
+        }
+        return func.apply(thisBinding, args);
+      }
+      setBindData(bound, bindData);
+      return bound;
+    }
+
+    /**
+     * The base implementation of `_.difference` that accepts a single array
+     * of values to exclude.
+     *
+     * @private
+     * @param {Array} array The array to process.
+     * @param {Array} [values] The array of values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
+     */
+    function baseDifference(array, values) {
+      var index = -1,
+          indexOf = getIndexOf(),
+          length = array ? array.length : 0,
+          isLarge = length >= largeArraySize && indexOf === baseIndexOf,
+          result = [];
+
+      if (isLarge) {
+        var cache = createCache(values);
+        if (cache) {
+          indexOf = cacheIndexOf;
+          values = cache;
+        } else {
+          isLarge = false;
+        }
+      }
+      while (++index < length) {
+        var value = array[index];
+        if (indexOf(values, value) < 0) {
+          result.push(value);
+        }
+      }
+      if (isLarge) {
+        releaseObject(values);
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.flatten` without support for callback
+     * shorthands or `thisArg` binding.
+     *
+     * @private
+     * @param {Array} array The array to flatten.
+     * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level.
+     * @param {boolean} [isStrict=false] A flag to restrict flattening to arrays and `arguments` objects.
+     * @param {number} [fromIndex=0] The index to start from.
+     * @returns {Array} Returns a new flattened array.
+     */
+    function baseFlatten(array, isShallow, isStrict, fromIndex) {
+      var index = (fromIndex || 0) - 1,
+          length = array ? array.length : 0,
+          result = [];
+
+      while (++index < length) {
+        var value = array[index];
+
+        if (value && typeof value == 'object' && typeof value.length == 'number'
+            && (isArray(value) || isArguments(value))) {
+          // recursively flatten arrays (susceptible to call stack limits)
+          if (!isShallow) {
+            value = baseFlatten(value, isShallow, isStrict);
+          }
+          var valIndex = -1,
+              valLength = value.length,
+              resIndex = result.length;
+
+          result.length += valLength;
+          while (++valIndex < valLength) {
+            result[resIndex++] = value[valIndex];
+          }
+        } else if (!isStrict) {
+          result.push(value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.isEqual`, without support for `thisArg` binding,
+     * that allows partial "_.where" style comparisons.
+     *
+     * @private
+     * @param {*} a The value to compare.
+     * @param {*} b The other value to compare.
+     * @param {Function} [callback] The function to customize comparing values.
+     * @param {Function} [isWhere=false] A flag to indicate performing partial comparisons.
+     * @param {Array} [stackA=[]] Tracks traversed `a` objects.
+     * @param {Array} [stackB=[]] Tracks traversed `b` objects.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     */
+    function baseIsEqual(a, b, callback, isWhere, stackA, stackB) {
+      // used to indicate that when comparing objects, `a` has at least the properties of `b`
+      if (callback) {
+        var result = callback(a, b);
+        if (typeof result != 'undefined') {
+          return !!result;
+        }
+      }
+      // exit early for identical values
+      if (a === b) {
+        // treat `+0` vs. `-0` as not equal
+        return a !== 0 || (1 / a == 1 / b);
+      }
+      var type = typeof a,
+          otherType = typeof b;
+
+      // exit early for unlike primitive values
+      if (a === a &&
+          !(a && objectTypes[type]) &&
+          !(b && objectTypes[otherType])) {
+        return false;
+      }
+      // exit early for `null` and `undefined` avoiding ES3's Function#call behavior
+      // http://es5.github.io/#x15.3.4.4
+      if (a == null || b == null) {
+        return a === b;
+      }
+      // compare [[Class]] names
+      var className = toString.call(a),
+          otherClass = toString.call(b);
+
+      if (className == argsClass) {
+        className = objectClass;
+      }
+      if (otherClass == argsClass) {
+        otherClass = objectClass;
+      }
+      if (className != otherClass) {
+        return false;
+      }
+      switch (className) {
+        case boolClass:
+        case dateClass:
+          // coerce dates and booleans to numbers, dates to milliseconds and booleans
+          // to `1` or `0` treating invalid dates coerced to `NaN` as not equal
+          return +a == +b;
+
+        case numberClass:
+          // treat `NaN` vs. `NaN` as equal
+          return (a != +a)
+            ? b != +b
+            // but treat `+0` vs. `-0` as not equal
+            : (a == 0 ? (1 / a == 1 / b) : a == +b);
+
+        case regexpClass:
+        case stringClass:
+          // coerce regexes to strings (http://es5.github.io/#x15.10.6.4)
+          // treat string primitives and their corresponding object instances as equal
+          return a == String(b);
+      }
+      var isArr = className == arrayClass;
+      if (!isArr) {
+        // unwrap any `lodash` wrapped values
+        var aWrapped = hasOwnProperty.call(a, '__wrapped__'),
+            bWrapped = hasOwnProperty.call(b, '__wrapped__');
+
+        if (aWrapped || bWrapped) {
+          return baseIsEqual(aWrapped ? a.__wrapped__ : a, bWrapped ? b.__wrapped__ : b, callback, isWhere, stackA, stackB);
+        }
+        // exit for functions and DOM nodes
+        if (className != objectClass) {
+          return false;
+        }
+        // in older versions of Opera, `arguments` objects have `Array` constructors
+        var ctorA = a.constructor,
+            ctorB = b.constructor;
+
+        // non `Object` object instances with different constructors are not equal
+        if (ctorA != ctorB &&
+              !(isFunction(ctorA) && ctorA instanceof ctorA && isFunction(ctorB) && ctorB instanceof ctorB) &&
+              ('constructor' in a && 'constructor' in b)
+            ) {
+          return false;
+        }
+      }
+      // assume cyclic structures are equal
+      // the algorithm for detecting cyclic structures is adapted from ES 5.1
+      // section 15.12.3, abstract operation `JO` (http://es5.github.io/#x15.12.3)
+      var initedStack = !stackA;
+      stackA || (stackA = getArray());
+      stackB || (stackB = getArray());
+
+      var length = stackA.length;
+      while (length--) {
+        if (stackA[length] == a) {
+          return stackB[length] == b;
+        }
+      }
+      var size = 0;
+      result = true;
+
+      // add `a` and `b` to the stack of traversed objects
+      stackA.push(a);
+      stackB.push(b);
+
+      // recursively compare objects and arrays (susceptible to call stack limits)
+      if (isArr) {
+        // compare lengths to determine if a deep comparison is necessary
+        length = a.length;
+        size = b.length;
+        result = size == length;
+
+        if (result || isWhere) {
+          // deep compare the contents, ignoring non-numeric properties
+          while (size--) {
+            var index = length,
+                value = b[size];
+
+            if (isWhere) {
+              while (index--) {
+                if ((result = baseIsEqual(a[index], value, callback, isWhere, stackA, stackB))) {
+                  break;
+                }
+              }
+            } else if (!(result = baseIsEqual(a[size], value, callback, isWhere, stackA, stackB))) {
+              break;
+            }
+          }
+        }
+      }
+      else {
+        // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys`
+        // which, in this case, is more costly
+        forIn(b, function(value, key, b) {
+          if (hasOwnProperty.call(b, key)) {
+            // count the number of properties.
+            size++;
+            // deep compare each property value.
+            return (result = hasOwnProperty.call(a, key) && baseIsEqual(a[key], value, callback, isWhere, stackA, stackB));
+          }
+        });
+
+        if (result && !isWhere) {
+          // ensure both objects have the same number of properties
+          forIn(a, function(value, key, a) {
+            if (hasOwnProperty.call(a, key)) {
+              // `size` will be `-1` if `a` has more properties than `b`
+              return (result = --size > -1);
+            }
+          });
+        }
+      }
+      stackA.pop();
+      stackB.pop();
+
+      if (initedStack) {
+        releaseArray(stackA);
+        releaseArray(stackB);
+      }
+      return result;
+    }
+
+    /**
+     * The base implementation of `_.merge` without argument juggling or support
+     * for `thisArg` binding.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @param {Function} [callback] The function to customize merging properties.
+     * @param {Array} [stackA=[]] Tracks traversed source objects.
+     * @param {Array} [stackB=[]] Associates values with source counterparts.
+     */
+    function baseMerge(object, source, callback, stackA, stackB) {
+      (isArray(source) ? forEach : forOwn)(source, function(source, key) {
+        var found,
+            isArr,
+            result = source,
+            value = object[key];
+
+        if (source && ((isArr = isArray(source)) || isPlainObject(source))) {
+          // avoid merging previously merged cyclic sources
+          var stackLength = stackA.length;
+          while (stackLength--) {
+            if ((found = stackA[stackLength] == source)) {
+              value = stackB[stackLength];
+              break;
+            }
+          }
+          if (!found) {
+            var isShallow;
+            if (callback) {
+              result = callback(value, source);
+              if ((isShallow = typeof result != 'undefined')) {
+                value = result;
+              }
+            }
+            if (!isShallow) {
+              value = isArr
+                ? (isArray(value) ? value : [])
+                : (isPlainObject(value) ? value : {});
+            }
+            // add `source` and associated `value` to the stack of traversed objects
+            stackA.push(source);
+            stackB.push(value);
+
+            // recursively merge objects and arrays (susceptible to call stack limits)
+            if (!isShallow) {
+              baseMerge(value, source, callback, stackA, stackB);
+            }
+          }
+        }
+        else {
+          if (callback) {
+            result = callback(value, source);
+            if (typeof result == 'undefined') {
+              result = source;
+            }
+          }
+          if (typeof result != 'undefined') {
+            value = result;
+          }
+        }
+        object[key] = value;
+      });
+    }
+
+    /**
+     * The base implementation of `_.random` without argument juggling or support
+     * for returning floating-point numbers.
+     *
+     * @private
+     * @param {number} min The minimum possible value.
+     * @param {number} max The maximum possible value.
+     * @returns {number} Returns a random number.
+     */
+    function baseRandom(min, max) {
+      return min + floor(nativeRandom() * (max - min + 1));
+    }
+
+    /**
+     * The base implementation of `_.uniq` without support for callback shorthands
+     * or `thisArg` binding.
+     *
+     * @private
+     * @param {Array} array The array to process.
+     * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted.
+     * @param {Function} [callback] The function called per iteration.
+     * @returns {Array} Returns a duplicate-value-free array.
+     */
+    function baseUniq(array, isSorted, callback) {
+      var index = -1,
+          indexOf = getIndexOf(),
+          length = array ? array.length : 0,
+          result = [];
+
+      var isLarge = !isSorted && length >= largeArraySize && indexOf === baseIndexOf,
+          seen = (callback || isLarge) ? getArray() : result;
+
+      if (isLarge) {
+        var cache = createCache(seen);
+        indexOf = cacheIndexOf;
+        seen = cache;
+      }
+      while (++index < length) {
+        var value = array[index],
+            computed = callback ? callback(value, index, array) : value;
+
+        if (isSorted
+              ? !index || seen[seen.length - 1] !== computed
+              : indexOf(seen, computed) < 0
+            ) {
+          if (callback || isLarge) {
+            seen.push(computed);
+          }
+          result.push(value);
+        }
+      }
+      if (isLarge) {
+        releaseArray(seen.array);
+        releaseObject(seen);
+      } else if (callback) {
+        releaseArray(seen);
+      }
+      return result;
+    }
+
+    /**
+     * Creates a function that aggregates a collection, creating an object composed
+     * of keys generated from the results of running each element of the collection
+     * through a callback. The given `setter` function sets the keys and values
+     * of the composed object.
+     *
+     * @private
+     * @param {Function} setter The setter function.
+     * @returns {Function} Returns the new aggregator function.
+     */
+    function createAggregator(setter) {
+      return function(collection, callback, thisArg) {
+        var result = {};
+        callback = lodash.createCallback(callback, thisArg, 3);
+
+        var index = -1,
+            length = collection ? collection.length : 0;
+
+        if (typeof length == 'number') {
+          while (++index < length) {
+            var value = collection[index];
+            setter(result, value, callback(value, index, collection), collection);
+          }
+        } else {
+          forOwn(collection, function(value, key, collection) {
+            setter(result, value, callback(value, key, collection), collection);
+          });
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Creates a function that, when called, either curries or invokes `func`
+     * with an optional `this` binding and partially applied arguments.
+     *
+     * @private
+     * @param {Function|string} func The function or method name to reference.
+     * @param {number} bitmask The bitmask of method flags to compose.
+     *  The bitmask may be composed of the following flags:
+     *  1 - `_.bind`
+     *  2 - `_.bindKey`
+     *  4 - `_.curry`
+     *  8 - `_.curry` (bound)
+     *  16 - `_.partial`
+     *  32 - `_.partialRight`
+     * @param {Array} [partialArgs] An array of arguments to prepend to those
+     *  provided to the new function.
+     * @param {Array} [partialRightArgs] An array of arguments to append to those
+     *  provided to the new function.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {number} [arity] The arity of `func`.
+     * @returns {Function} Returns the new function.
+     */
+    function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
+      var isBind = bitmask & 1,
+          isBindKey = bitmask & 2,
+          isCurry = bitmask & 4,
+          isCurryBound = bitmask & 8,
+          isPartial = bitmask & 16,
+          isPartialRight = bitmask & 32;
+
+      if (!isBindKey && !isFunction(func)) {
+        throw new TypeError;
+      }
+      if (isPartial && !partialArgs.length) {
+        bitmask &= ~16;
+        isPartial = partialArgs = false;
+      }
+      if (isPartialRight && !partialRightArgs.length) {
+        bitmask &= ~32;
+        isPartialRight = partialRightArgs = false;
+      }
+      var bindData = func && func.__bindData__;
+      if (bindData && bindData !== true) {
+        // clone `bindData`
+        bindData = slice(bindData);
+        if (bindData[2]) {
+          bindData[2] = slice(bindData[2]);
+        }
+        if (bindData[3]) {
+          bindData[3] = slice(bindData[3]);
+        }
+        // set `thisBinding` is not previously bound
+        if (isBind && !(bindData[1] & 1)) {
+          bindData[4] = thisArg;
+        }
+        // set if previously bound but not currently (subsequent curried functions)
+        if (!isBind && bindData[1] & 1) {
+          bitmask |= 8;
+        }
+        // set curried arity if not yet set
+        if (isCurry && !(bindData[1] & 4)) {
+          bindData[5] = arity;
+        }
+        // append partial left arguments
+        if (isPartial) {
+          push.apply(bindData[2] || (bindData[2] = []), partialArgs);
+        }
+        // append partial right arguments
+        if (isPartialRight) {
+          unshift.apply(bindData[3] || (bindData[3] = []), partialRightArgs);
+        }
+        // merge flags
+        bindData[1] |= bitmask;
+        return createWrapper.apply(null, bindData);
+      }
+      // fast path for `_.bind`
+      var creater = (bitmask == 1 || bitmask === 17) ? baseBind : baseCreateWrapper;
+      return creater([func, bitmask, partialArgs, partialRightArgs, thisArg, arity]);
+    }
+
+    /**
+     * Used by `escape` to convert characters to HTML entities.
+     *
+     * @private
+     * @param {string} match The matched character to escape.
+     * @returns {string} Returns the escaped character.
+     */
+    function escapeHtmlChar(match) {
+      return htmlEscapes[match];
+    }
+
+    /**
+     * Gets the appropriate "indexOf" function. If the `_.indexOf` method is
+     * customized, this method returns the custom method, otherwise it returns
+     * the `baseIndexOf` function.
+     *
+     * @private
+     * @returns {Function} Returns the "indexOf" function.
+     */
+    function getIndexOf() {
+      var result = (result = lodash.indexOf) === indexOf ? baseIndexOf : result;
+      return result;
+    }
+
+    /**
+     * Checks if `value` is a native function.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a native function, else `false`.
+     */
+    function isNative(value) {
+      return typeof value == 'function' && reNative.test(value);
+    }
+
+    /**
+     * Sets `this` binding data on a given function.
+     *
+     * @private
+     * @param {Function} func The function to set data on.
+     * @param {Array} value The data array to set.
+     */
+    var setBindData = !defineProperty ? noop : function(func, value) {
+      descriptor.value = value;
+      defineProperty(func, '__bindData__', descriptor);
+    };
+
+    /**
+     * A fallback implementation of `isPlainObject` which checks if a given value
+     * is an object created by the `Object` constructor, assuming objects created
+     * by the `Object` constructor have no inherited enumerable properties and that
+     * there are no `Object.prototype` extensions.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
+     */
+    function shimIsPlainObject(value) {
+      var ctor,
+          result;
+
+      // avoid non Object objects, `arguments` objects, and DOM elements
+      if (!(value && toString.call(value) == objectClass) ||
+          (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor))) {
+        return false;
+      }
+      // In most environments an object's own properties are iterated before
+      // its inherited properties. If the last iterated property is an object's
+      // own property then there are no inherited enumerable properties.
+      forIn(value, function(value, key) {
+        result = key;
+      });
+      return typeof result == 'undefined' || hasOwnProperty.call(value, result);
+    }
+
+    /**
+     * Used by `unescape` to convert HTML entities to characters.
+     *
+     * @private
+     * @param {string} match The matched character to unescape.
+     * @returns {string} Returns the unescaped character.
+     */
+    function unescapeHtmlChar(match) {
+      return htmlUnescapes[match];
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Checks if `value` is an `arguments` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
+     * @example
+     *
+     * (function() { return _.isArguments(arguments); })(1, 2, 3);
+     * // => true
+     *
+     * _.isArguments([1, 2, 3]);
+     * // => false
+     */
+    function isArguments(value) {
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == argsClass || false;
+    }
+
+    /**
+     * Checks if `value` is an array.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is an array, else `false`.
+     * @example
+     *
+     * (function() { return _.isArray(arguments); })();
+     * // => false
+     *
+     * _.isArray([1, 2, 3]);
+     * // => true
+     */
+    var isArray = nativeIsArray || function(value) {
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == arrayClass || false;
+    };
+
+    /**
+     * A fallback implementation of `Object.keys` which produces an array of the
+     * given object's own enumerable property names.
+     *
+     * @private
+     * @type Function
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns an array of property names.
+     */
+    var shimKeys = function(object) {
+      var index, iterable = object, result = [];
+      if (!iterable) return result;
+      if (!(objectTypes[typeof object])) return result;
+        for (index in iterable) {
+          if (hasOwnProperty.call(iterable, index)) {
+            result.push(index);
+          }
+        }
+      return result
+    };
+
+    /**
+     * Creates an array composed of the own enumerable property names of an object.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns an array of property names.
+     * @example
+     *
+     * _.keys({ 'one': 1, 'two': 2, 'three': 3 });
+     * // => ['one', 'two', 'three'] (property order is not guaranteed across environments)
+     */
+    var keys = !nativeKeys ? shimKeys : function(object) {
+      if (!isObject(object)) {
+        return [];
+      }
+      return nativeKeys(object);
+    };
+
+    /**
+     * Used to convert characters to HTML entities:
+     *
+     * Though the `>` character is escaped for symmetry, characters like `>` and `/`
+     * don't require escaping in HTML and have no special meaning unless they're part
+     * of a tag or an unquoted attribute value.
+     * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
+     */
+    var htmlEscapes = {
+      '&': '&amp;',
+      '<': '&lt;',
+      '>': '&gt;',
+      '"': '&quot;',
+      "'": '&#39;'
+    };
+
+    /** Used to convert HTML entities to characters */
+    var htmlUnescapes = invert(htmlEscapes);
+
+    /** Used to match HTML entities and HTML characters */
+    var reEscapedHtml = RegExp('(' + keys(htmlUnescapes).join('|') + ')', 'g'),
+        reUnescapedHtml = RegExp('[' + keys(htmlEscapes).join('') + ']', 'g');
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Assigns own enumerable properties of source object(s) to the destination
+     * object. Subsequent sources will overwrite property assignments of previous
+     * sources. If a callback is provided it will be executed to produce the
+     * assigned values. The callback is bound to `thisArg` and invoked with two
+     * arguments; (objectValue, sourceValue).
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @alias extend
+     * @category Objects
+     * @param {Object} object The destination object.
+     * @param {...Object} [source] The source objects.
+     * @param {Function} [callback] The function to customize assigning values.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns the destination object.
+     * @example
+     *
+     * _.assign({ 'name': 'fred' }, { 'employer': 'slate' });
+     * // => { 'name': 'fred', 'employer': 'slate' }
+     *
+     * var defaults = _.partialRight(_.assign, function(a, b) {
+     *   return typeof a == 'undefined' ? b : a;
+     * });
+     *
+     * var object = { 'name': 'barney' };
+     * defaults(object, { 'name': 'fred', 'employer': 'slate' });
+     * // => { 'name': 'barney', 'employer': 'slate' }
+     */
+    var assign = function(object, source, guard) {
+      var index, iterable = object, result = iterable;
+      if (!iterable) return result;
+      var args = arguments,
+          argsIndex = 0,
+          argsLength = typeof guard == 'number' ? 2 : args.length;
+      if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {
+        var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2);
+      } else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {
+        callback = args[--argsLength];
+      }
+      while (++argsIndex < argsLength) {
+        iterable = args[argsIndex];
+        if (iterable && objectTypes[typeof iterable]) {
+        var ownIndex = -1,
+            ownProps = objectTypes[typeof iterable] && keys(iterable),
+            length = ownProps ? ownProps.length : 0;
+
+        while (++ownIndex < length) {
+          index = ownProps[ownIndex];
+          result[index] = callback ? callback(result[index], iterable[index]) : iterable[index];
+        }
+        }
+      }
+      return result
+    };
+
+    /**
+     * Creates a clone of `value`. If `isDeep` is `true` nested objects will also
+     * be cloned, otherwise they will be assigned by reference. If a callback
+     * is provided it will be executed to produce the cloned values. If the
+     * callback returns `undefined` cloning will be handled by the method instead.
+     * The callback is bound to `thisArg` and invoked with one argument; (value).
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @param {Function} [callback] The function to customize cloning values.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the cloned value.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * var shallow = _.clone(characters);
+     * shallow[0] === characters[0];
+     * // => true
+     *
+     * var deep = _.clone(characters, true);
+     * deep[0] === characters[0];
+     * // => false
+     *
+     * _.mixin({
+     *   'clone': _.partialRight(_.clone, function(value) {
+     *     return _.isElement(value) ? value.cloneNode(false) : undefined;
+     *   })
+     * });
+     *
+     * var clone = _.clone(document.body);
+     * clone.childNodes.length;
+     * // => 0
+     */
+    function clone(value, isDeep, callback, thisArg) {
+      // allows working with "Collections" methods without using their `index`
+      // and `collection` arguments for `isDeep` and `callback`
+      if (typeof isDeep != 'boolean' && isDeep != null) {
+        thisArg = callback;
+        callback = isDeep;
+        isDeep = false;
+      }
+      return baseClone(value, isDeep, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1));
+    }
+
+    /**
+     * Creates a deep clone of `value`. If a callback is provided it will be
+     * executed to produce the cloned values. If the callback returns `undefined`
+     * cloning will be handled by the method instead. The callback is bound to
+     * `thisArg` and invoked with one argument; (value).
+     *
+     * Note: This method is loosely based on the structured clone algorithm. Functions
+     * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
+     * objects created by constructors other than `Object` are cloned to plain `Object` objects.
+     * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to deep clone.
+     * @param {Function} [callback] The function to customize cloning values.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the deep cloned value.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * var deep = _.cloneDeep(characters);
+     * deep[0] === characters[0];
+     * // => false
+     *
+     * var view = {
+     *   'label': 'docs',
+     *   'node': element
+     * };
+     *
+     * var clone = _.cloneDeep(view, function(value) {
+     *   return _.isElement(value) ? value.cloneNode(true) : undefined;
+     * });
+     *
+     * clone.node == view.node;
+     * // => false
+     */
+    function cloneDeep(value, callback, thisArg) {
+      return baseClone(value, true, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1));
+    }
+
+    /**
+     * Creates an object that inherits from the given `prototype` object. If a
+     * `properties` object is provided its own enumerable properties are assigned
+     * to the created object.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} prototype The object to inherit from.
+     * @param {Object} [properties] The properties to assign to the object.
+     * @returns {Object} Returns the new object.
+     * @example
+     *
+     * function Shape() {
+     *   this.x = 0;
+     *   this.y = 0;
+     * }
+     *
+     * function Circle() {
+     *   Shape.call(this);
+     * }
+     *
+     * Circle.prototype = _.create(Shape.prototype, { 'constructor': Circle });
+     *
+     * var circle = new Circle;
+     * circle instanceof Circle;
+     * // => true
+     *
+     * circle instanceof Shape;
+     * // => true
+     */
+    function create(prototype, properties) {
+      var result = baseCreate(prototype);
+      return properties ? assign(result, properties) : result;
+    }
+
+    /**
+     * Assigns own enumerable properties of source object(s) to the destination
+     * object for all destination properties that resolve to `undefined`. Once a
+     * property is set, additional defaults of the same property will be ignored.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Objects
+     * @param {Object} object The destination object.
+     * @param {...Object} [source] The source objects.
+     * @param- {Object} [guard] Allows working with `_.reduce` without using its
+     *  `key` and `object` arguments as sources.
+     * @returns {Object} Returns the destination object.
+     * @example
+     *
+     * var object = { 'name': 'barney' };
+     * _.defaults(object, { 'name': 'fred', 'employer': 'slate' });
+     * // => { 'name': 'barney', 'employer': 'slate' }
+     */
+    var defaults = function(object, source, guard) {
+      var index, iterable = object, result = iterable;
+      if (!iterable) return result;
+      var args = arguments,
+          argsIndex = 0,
+          argsLength = typeof guard == 'number' ? 2 : args.length;
+      while (++argsIndex < argsLength) {
+        iterable = args[argsIndex];
+        if (iterable && objectTypes[typeof iterable]) {
+        var ownIndex = -1,
+            ownProps = objectTypes[typeof iterable] && keys(iterable),
+            length = ownProps ? ownProps.length : 0;
+
+        while (++ownIndex < length) {
+          index = ownProps[ownIndex];
+          if (typeof result[index] == 'undefined') result[index] = iterable[index];
+        }
+        }
+      }
+      return result
+    };
+
+    /**
+     * This method is like `_.findIndex` except that it returns the key of the
+     * first element that passes the callback check, instead of the element itself.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to search.
+     * @param {Function|Object|string} [callback=identity] The function called per
+     *  iteration. If a property name or object is provided it will be used to
+     *  create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {string|undefined} Returns the key of the found element, else `undefined`.
+     * @example
+     *
+     * var characters = {
+     *   'barney': {  'age': 36, 'blocked': false },
+     *   'fred': {    'age': 40, 'blocked': true },
+     *   'pebbles': { 'age': 1,  'blocked': false }
+     * };
+     *
+     * _.findKey(characters, function(chr) {
+     *   return chr.age < 40;
+     * });
+     * // => 'barney' (property order is not guaranteed across environments)
+     *
+     * // using "_.where" callback shorthand
+     * _.findKey(characters, { 'age': 1 });
+     * // => 'pebbles'
+     *
+     * // using "_.pluck" callback shorthand
+     * _.findKey(characters, 'blocked');
+     * // => 'fred'
+     */
+    function findKey(object, callback, thisArg) {
+      var result;
+      callback = lodash.createCallback(callback, thisArg, 3);
+      forOwn(object, function(value, key, object) {
+        if (callback(value, key, object)) {
+          result = key;
+          return false;
+        }
+      });
+      return result;
+    }
+
+    /**
+     * This method is like `_.findKey` except that it iterates over elements
+     * of a `collection` in the opposite order.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to search.
+     * @param {Function|Object|string} [callback=identity] The function called per
+     *  iteration. If a property name or object is provided it will be used to
+     *  create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {string|undefined} Returns the key of the found element, else `undefined`.
+     * @example
+     *
+     * var characters = {
+     *   'barney': {  'age': 36, 'blocked': true },
+     *   'fred': {    'age': 40, 'blocked': false },
+     *   'pebbles': { 'age': 1,  'blocked': true }
+     * };
+     *
+     * _.findLastKey(characters, function(chr) {
+     *   return chr.age < 40;
+     * });
+     * // => returns `pebbles`, assuming `_.findKey` returns `barney`
+     *
+     * // using "_.where" callback shorthand
+     * _.findLastKey(characters, { 'age': 40 });
+     * // => 'fred'
+     *
+     * // using "_.pluck" callback shorthand
+     * _.findLastKey(characters, 'blocked');
+     * // => 'pebbles'
+     */
+    function findLastKey(object, callback, thisArg) {
+      var result;
+      callback = lodash.createCallback(callback, thisArg, 3);
+      forOwnRight(object, function(value, key, object) {
+        if (callback(value, key, object)) {
+          result = key;
+          return false;
+        }
+      });
+      return result;
+    }
+
+    /**
+     * Iterates over own and inherited enumerable properties of an object,
+     * executing the callback for each property. The callback is bound to `thisArg`
+     * and invoked with three arguments; (value, key, object). Callbacks may exit
+     * iteration early by explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Objects
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * function Shape() {
+     *   this.x = 0;
+     *   this.y = 0;
+     * }
+     *
+     * Shape.prototype.move = function(x, y) {
+     *   this.x += x;
+     *   this.y += y;
+     * };
+     *
+     * _.forIn(new Shape, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => logs 'x', 'y', and 'move' (property order is not guaranteed across environments)
+     */
+    var forIn = function(collection, callback, thisArg) {
+      var index, iterable = collection, result = iterable;
+      if (!iterable) return result;
+      if (!objectTypes[typeof iterable]) return result;
+      callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
+        for (index in iterable) {
+          if (callback(iterable[index], index, collection) === false) return result;
+        }
+      return result
+    };
+
+    /**
+     * This method is like `_.forIn` except that it iterates over elements
+     * of a `collection` in the opposite order.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * function Shape() {
+     *   this.x = 0;
+     *   this.y = 0;
+     * }
+     *
+     * Shape.prototype.move = function(x, y) {
+     *   this.x += x;
+     *   this.y += y;
+     * };
+     *
+     * _.forInRight(new Shape, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => logs 'move', 'y', and 'x' assuming `_.forIn ` logs 'x', 'y', and 'move'
+     */
+    function forInRight(object, callback, thisArg) {
+      var pairs = [];
+
+      forIn(object, function(value, key) {
+        pairs.push(key, value);
+      });
+
+      var length = pairs.length;
+      callback = baseCreateCallback(callback, thisArg, 3);
+      while (length--) {
+        if (callback(pairs[length--], pairs[length], object) === false) {
+          break;
+        }
+      }
+      return object;
+    }
+
+    /**
+     * Iterates over own enumerable properties of an object, executing the callback
+     * for each property. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, key, object). Callbacks may exit iteration early by
+     * explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Objects
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
+     *   console.log(key);
+     * });
+     * // => logs '0', '1', and 'length' (property order is not guaranteed across environments)
+     */
+    var forOwn = function(collection, callback, thisArg) {
+      var index, iterable = collection, result = iterable;
+      if (!iterable) return result;
+      if (!objectTypes[typeof iterable]) return result;
+      callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
+        var ownIndex = -1,
+            ownProps = objectTypes[typeof iterable] && keys(iterable),
+            length = ownProps ? ownProps.length : 0;
+
+        while (++ownIndex < length) {
+          index = ownProps[ownIndex];
+          if (callback(iterable[index], index, collection) === false) return result;
+        }
+      return result
+    };
+
+    /**
+     * This method is like `_.forOwn` except that it iterates over elements
+     * of a `collection` in the opposite order.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * _.forOwnRight({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
+     *   console.log(key);
+     * });
+     * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length'
+     */
+    function forOwnRight(object, callback, thisArg) {
+      var props = keys(object),
+          length = props.length;
+
+      callback = baseCreateCallback(callback, thisArg, 3);
+      while (length--) {
+        var key = props[length];
+        if (callback(object[key], key, object) === false) {
+          break;
+        }
+      }
+      return object;
+    }
+
+    /**
+     * Creates a sorted array of property names of all enumerable properties,
+     * own and inherited, of `object` that have function values.
+     *
+     * @static
+     * @memberOf _
+     * @alias methods
+     * @category Objects
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns an array of property names that have function values.
+     * @example
+     *
+     * _.functions(_);
+     * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
+     */
+    function functions(object) {
+      var result = [];
+      forIn(object, function(value, key) {
+        if (isFunction(value)) {
+          result.push(key);
+        }
+      });
+      return result.sort();
+    }
+
+    /**
+     * Checks if the specified property name exists as a direct property of `object`,
+     * instead of an inherited property.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to inspect.
+     * @param {string} key The name of the property to check.
+     * @returns {boolean} Returns `true` if key is a direct property, else `false`.
+     * @example
+     *
+     * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
+     * // => true
+     */
+    function has(object, key) {
+      return object ? hasOwnProperty.call(object, key) : false;
+    }
+
+    /**
+     * Creates an object composed of the inverted keys and values of the given object.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to invert.
+     * @returns {Object} Returns the created inverted object.
+     * @example
+     *
+     * _.invert({ 'first': 'fred', 'second': 'barney' });
+     * // => { 'fred': 'first', 'barney': 'second' }
+     */
+    function invert(object) {
+      var index = -1,
+          props = keys(object),
+          length = props.length,
+          result = {};
+
+      while (++index < length) {
+        var key = props[index];
+        result[object[key]] = key;
+      }
+      return result;
+    }
+
+    /**
+     * Checks if `value` is a boolean value.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`.
+     * @example
+     *
+     * _.isBoolean(null);
+     * // => false
+     */
+    function isBoolean(value) {
+      return value === true || value === false ||
+        value && typeof value == 'object' && toString.call(value) == boolClass || false;
+    }
+
+    /**
+     * Checks if `value` is a date.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a date, else `false`.
+     * @example
+     *
+     * _.isDate(new Date);
+     * // => true
+     */
+    function isDate(value) {
+      return value && typeof value == 'object' && toString.call(value) == dateClass || false;
+    }
+
+    /**
+     * Checks if `value` is a DOM element.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a DOM element, else `false`.
+     * @example
+     *
+     * _.isElement(document.body);
+     * // => true
+     */
+    function isElement(value) {
+      return value && value.nodeType === 1 || false;
+    }
+
+    /**
+     * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
+     * length of `0` and objects with no own enumerable properties are considered
+     * "empty".
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Array|Object|string} value The value to inspect.
+     * @returns {boolean} Returns `true` if the `value` is empty, else `false`.
+     * @example
+     *
+     * _.isEmpty([1, 2, 3]);
+     * // => false
+     *
+     * _.isEmpty({});
+     * // => true
+     *
+     * _.isEmpty('');
+     * // => true
+     */
+    function isEmpty(value) {
+      var result = true;
+      if (!value) {
+        return result;
+      }
+      var className = toString.call(value),
+          length = value.length;
+
+      if ((className == arrayClass || className == stringClass || className == argsClass ) ||
+          (className == objectClass && typeof length == 'number' && isFunction(value.splice))) {
+        return !length;
+      }
+      forOwn(value, function() {
+        return (result = false);
+      });
+      return result;
+    }
+
+    /**
+     * Performs a deep comparison between two values to determine if they are
+     * equivalent to each other. If a callback is provided it will be executed
+     * to compare values. If the callback returns `undefined` comparisons will
+     * be handled by the method instead. The callback is bound to `thisArg` and
+     * invoked with two arguments; (a, b).
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} a The value to compare.
+     * @param {*} b The other value to compare.
+     * @param {Function} [callback] The function to customize comparing values.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     * @example
+     *
+     * var object = { 'name': 'fred' };
+     * var copy = { 'name': 'fred' };
+     *
+     * object == copy;
+     * // => false
+     *
+     * _.isEqual(object, copy);
+     * // => true
+     *
+     * var words = ['hello', 'goodbye'];
+     * var otherWords = ['hi', 'goodbye'];
+     *
+     * _.isEqual(words, otherWords, function(a, b) {
+     *   var reGreet = /^(?:hello|hi)$/i,
+     *       aGreet = _.isString(a) && reGreet.test(a),
+     *       bGreet = _.isString(b) && reGreet.test(b);
+     *
+     *   return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
+     * });
+     * // => true
+     */
+    function isEqual(a, b, callback, thisArg) {
+      return baseIsEqual(a, b, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 2));
+    }
+
+    /**
+     * Checks if `value` is, or can be coerced to, a finite number.
+     *
+     * Note: This is not the same as native `isFinite` which will return true for
+     * booleans and empty strings. See http://es5.github.io/#x15.1.2.5.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is finite, else `false`.
+     * @example
+     *
+     * _.isFinite(-101);
+     * // => true
+     *
+     * _.isFinite('10');
+     * // => true
+     *
+     * _.isFinite(true);
+     * // => false
+     *
+     * _.isFinite('');
+     * // => false
+     *
+     * _.isFinite(Infinity);
+     * // => false
+     */
+    function isFinite(value) {
+      return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
+    }
+
+    /**
+     * Checks if `value` is a function.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a function, else `false`.
+     * @example
+     *
+     * _.isFunction(_);
+     * // => true
+     */
+    function isFunction(value) {
+      return typeof value == 'function';
+    }
+
+    /**
+     * Checks if `value` is the language type of Object.
+     * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is an object, else `false`.
+     * @example
+     *
+     * _.isObject({});
+     * // => true
+     *
+     * _.isObject([1, 2, 3]);
+     * // => true
+     *
+     * _.isObject(1);
+     * // => false
+     */
+    function isObject(value) {
+      // check if the value is the ECMAScript language type of Object
+      // http://es5.github.io/#x8
+      // and avoid a V8 bug
+      // http://code.google.com/p/v8/issues/detail?id=2291
+      return !!(value && objectTypes[typeof value]);
+    }
+
+    /**
+     * Checks if `value` is `NaN`.
+     *
+     * Note: This is not the same as native `isNaN` which will return `true` for
+     * `undefined` and other non-numeric values. See http://es5.github.io/#x15.1.2.4.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is `NaN`, else `false`.
+     * @example
+     *
+     * _.isNaN(NaN);
+     * // => true
+     *
+     * _.isNaN(new Number(NaN));
+     * // => true
+     *
+     * isNaN(undefined);
+     * // => true
+     *
+     * _.isNaN(undefined);
+     * // => false
+     */
+    function isNaN(value) {
+      // `NaN` as a primitive is the only value that is not equal to itself
+      // (perform the [[Class]] check first to avoid errors with some host objects in IE)
+      return isNumber(value) && value != +value;
+    }
+
+    /**
+     * Checks if `value` is `null`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is `null`, else `false`.
+     * @example
+     *
+     * _.isNull(null);
+     * // => true
+     *
+     * _.isNull(undefined);
+     * // => false
+     */
+    function isNull(value) {
+      return value === null;
+    }
+
+    /**
+     * Checks if `value` is a number.
+     *
+     * Note: `NaN` is considered a number. See http://es5.github.io/#x8.5.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a number, else `false`.
+     * @example
+     *
+     * _.isNumber(8.4 * 5);
+     * // => true
+     */
+    function isNumber(value) {
+      return typeof value == 'number' ||
+        value && typeof value == 'object' && toString.call(value) == numberClass || false;
+    }
+
+    /**
+     * Checks if `value` is an object created by the `Object` constructor.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
+     * @example
+     *
+     * function Shape() {
+     *   this.x = 0;
+     *   this.y = 0;
+     * }
+     *
+     * _.isPlainObject(new Shape);
+     * // => false
+     *
+     * _.isPlainObject([1, 2, 3]);
+     * // => false
+     *
+     * _.isPlainObject({ 'x': 0, 'y': 0 });
+     * // => true
+     */
+    var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) {
+      if (!(value && toString.call(value) == objectClass)) {
+        return false;
+      }
+      var valueOf = value.valueOf,
+          objProto = isNative(valueOf) && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);
+
+      return objProto
+        ? (value == objProto || getPrototypeOf(value) == objProto)
+        : shimIsPlainObject(value);
+    };
+
+    /**
+     * Checks if `value` is a regular expression.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`.
+     * @example
+     *
+     * _.isRegExp(/fred/);
+     * // => true
+     */
+    function isRegExp(value) {
+      return value && typeof value == 'object' && toString.call(value) == regexpClass || false;
+    }
+
+    /**
+     * Checks if `value` is a string.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is a string, else `false`.
+     * @example
+     *
+     * _.isString('fred');
+     * // => true
+     */
+    function isString(value) {
+      return typeof value == 'string' ||
+        value && typeof value == 'object' && toString.call(value) == stringClass || false;
+    }
+
+    /**
+     * Checks if `value` is `undefined`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if the `value` is `undefined`, else `false`.
+     * @example
+     *
+     * _.isUndefined(void 0);
+     * // => true
+     */
+    function isUndefined(value) {
+      return typeof value == 'undefined';
+    }
+
+    /**
+     * Creates an object with the same keys as `object` and values generated by
+     * running each own enumerable property of `object` through the callback.
+     * The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, key, object).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new object with values of the results of each `callback` execution.
+     * @example
+     *
+     * _.mapValues({ 'a': 1, 'b': 2, 'c': 3} , function(num) { return num * 3; });
+     * // => { 'a': 3, 'b': 6, 'c': 9 }
+     *
+     * var characters = {
+     *   'fred': { 'name': 'fred', 'age': 40 },
+     *   'pebbles': { 'name': 'pebbles', 'age': 1 }
+     * };
+     *
+     * // using "_.pluck" callback shorthand
+     * _.mapValues(characters, 'age');
+     * // => { 'fred': 40, 'pebbles': 1 }
+     */
+    function mapValues(object, callback, thisArg) {
+      var result = {};
+      callback = lodash.createCallback(callback, thisArg, 3);
+
+      forOwn(object, function(value, key, object) {
+        result[key] = callback(value, key, object);
+      });
+      return result;
+    }
+
+    /**
+     * Recursively merges own enumerable properties of the source object(s), that
+     * don't resolve to `undefined` into the destination object. Subsequent sources
+     * will overwrite property assignments of previous sources. If a callback is
+     * provided it will be executed to produce the merged values of the destination
+     * and source properties. If the callback returns `undefined` merging will
+     * be handled by the method instead. The callback is bound to `thisArg` and
+     * invoked with two arguments; (objectValue, sourceValue).
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The destination object.
+     * @param {...Object} [source] The source objects.
+     * @param {Function} [callback] The function to customize merging properties.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns the destination object.
+     * @example
+     *
+     * var names = {
+     *   'characters': [
+     *     { 'name': 'barney' },
+     *     { 'name': 'fred' }
+     *   ]
+     * };
+     *
+     * var ages = {
+     *   'characters': [
+     *     { 'age': 36 },
+     *     { 'age': 40 }
+     *   ]
+     * };
+     *
+     * _.merge(names, ages);
+     * // => { 'characters': [{ 'name': 'barney', 'age': 36 }, { 'name': 'fred', 'age': 40 }] }
+     *
+     * var food = {
+     *   'fruits': ['apple'],
+     *   'vegetables': ['beet']
+     * };
+     *
+     * var otherFood = {
+     *   'fruits': ['banana'],
+     *   'vegetables': ['carrot']
+     * };
+     *
+     * _.merge(food, otherFood, function(a, b) {
+     *   return _.isArray(a) ? a.concat(b) : undefined;
+     * });
+     * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] }
+     */
+    function merge(object) {
+      var args = arguments,
+          length = 2;
+
+      if (!isObject(object)) {
+        return object;
+      }
+      // allows working with `_.reduce` and `_.reduceRight` without using
+      // their `index` and `collection` arguments
+      if (typeof args[2] != 'number') {
+        length = args.length;
+      }
+      if (length > 3 && typeof args[length - 2] == 'function') {
+        var callback = baseCreateCallback(args[--length - 1], args[length--], 2);
+      } else if (length > 2 && typeof args[length - 1] == 'function') {
+        callback = args[--length];
+      }
+      var sources = slice(arguments, 1, length),
+          index = -1,
+          stackA = getArray(),
+          stackB = getArray();
+
+      while (++index < length) {
+        baseMerge(object, sources[index], callback, stackA, stackB);
+      }
+      releaseArray(stackA);
+      releaseArray(stackB);
+      return object;
+    }
+
+    /**
+     * Creates a shallow clone of `object` excluding the specified properties.
+     * Property names may be specified as individual arguments or as arrays of
+     * property names. If a callback is provided it will be executed for each
+     * property of `object` omitting the properties the callback returns truey
+     * for. The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, key, object).
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The source object.
+     * @param {Function|...string|string[]} [callback] The properties to omit or the
+     *  function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns an object without the omitted properties.
+     * @example
+     *
+     * _.omit({ 'name': 'fred', 'age': 40 }, 'age');
+     * // => { 'name': 'fred' }
+     *
+     * _.omit({ 'name': 'fred', 'age': 40 }, function(value) {
+     *   return typeof value == 'number';
+     * });
+     * // => { 'name': 'fred' }
+     */
+    function omit(object, callback, thisArg) {
+      var result = {};
+      if (typeof callback != 'function') {
+        var props = [];
+        forIn(object, function(value, key) {
+          props.push(key);
+        });
+        props = baseDifference(props, baseFlatten(arguments, true, false, 1));
+
+        var index = -1,
+            length = props.length;
+
+        while (++index < length) {
+          var key = props[index];
+          result[key] = object[key];
+        }
+      } else {
+        callback = lodash.createCallback(callback, thisArg, 3);
+        forIn(object, function(value, key, object) {
+          if (!callback(value, key, object)) {
+            result[key] = value;
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Creates a two dimensional array of an object's key-value pairs,
+     * i.e. `[[key1, value1], [key2, value2]]`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns new array of key-value pairs.
+     * @example
+     *
+     * _.pairs({ 'barney': 36, 'fred': 40 });
+     * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments)
+     */
+    function pairs(object) {
+      var index = -1,
+          props = keys(object),
+          length = props.length,
+          result = Array(length);
+
+      while (++index < length) {
+        var key = props[index];
+        result[index] = [key, object[key]];
+      }
+      return result;
+    }
+
+    /**
+     * Creates a shallow clone of `object` composed of the specified properties.
+     * Property names may be specified as individual arguments or as arrays of
+     * property names. If a callback is provided it will be executed for each
+     * property of `object` picking the properties the callback returns truey
+     * for. The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, key, object).
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The source object.
+     * @param {Function|...string|string[]} [callback] The function called per
+     *  iteration or property names to pick, specified as individual property
+     *  names or arrays of property names.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns an object composed of the picked properties.
+     * @example
+     *
+     * _.pick({ 'name': 'fred', '_userid': 'fred1' }, 'name');
+     * // => { 'name': 'fred' }
+     *
+     * _.pick({ 'name': 'fred', '_userid': 'fred1' }, function(value, key) {
+     *   return key.charAt(0) != '_';
+     * });
+     * // => { 'name': 'fred' }
+     */
+    function pick(object, callback, thisArg) {
+      var result = {};
+      if (typeof callback != 'function') {
+        var index = -1,
+            props = baseFlatten(arguments, true, false, 1),
+            length = isObject(object) ? props.length : 0;
+
+        while (++index < length) {
+          var key = props[index];
+          if (key in object) {
+            result[key] = object[key];
+          }
+        }
+      } else {
+        callback = lodash.createCallback(callback, thisArg, 3);
+        forIn(object, function(value, key, object) {
+          if (callback(value, key, object)) {
+            result[key] = value;
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * An alternative to `_.reduce` this method transforms `object` to a new
+     * `accumulator` object which is the result of running each of its own
+     * enumerable properties through a callback, with each callback execution
+     * potentially mutating the `accumulator` object. The callback is bound to
+     * `thisArg` and invoked with four arguments; (accumulator, value, key, object).
+     * Callbacks may exit iteration early by explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Array|Object} object The object to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [accumulator] The custom accumulator value.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the accumulated value.
+     * @example
+     *
+     * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) {
+     *   num *= num;
+     *   if (num % 2) {
+     *     return result.push(num) < 3;
+     *   }
+     * });
+     * // => [1, 9, 25]
+     *
+     * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+     *   result[key] = num * 3;
+     * });
+     * // => { 'a': 3, 'b': 6, 'c': 9 }
+     */
+    function transform(object, callback, accumulator, thisArg) {
+      var isArr = isArray(object);
+      if (accumulator == null) {
+        if (isArr) {
+          accumulator = [];
+        } else {
+          var ctor = object && object.constructor,
+              proto = ctor && ctor.prototype;
+
+          accumulator = baseCreate(proto);
+        }
+      }
+      if (callback) {
+        callback = lodash.createCallback(callback, thisArg, 4);
+        (isArr ? forEach : forOwn)(object, function(value, index, object) {
+          return callback(accumulator, value, index, object);
+        });
+      }
+      return accumulator;
+    }
+
+    /**
+     * Creates an array composed of the own enumerable property values of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @category Objects
+     * @param {Object} object The object to inspect.
+     * @returns {Array} Returns an array of property values.
+     * @example
+     *
+     * _.values({ 'one': 1, 'two': 2, 'three': 3 });
+     * // => [1, 2, 3] (property order is not guaranteed across environments)
+     */
+    function values(object) {
+      var index = -1,
+          props = keys(object),
+          length = props.length,
+          result = Array(length);
+
+      while (++index < length) {
+        result[index] = object[props[index]];
+      }
+      return result;
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates an array of elements from the specified indexes, or keys, of the
+     * `collection`. Indexes may be specified as individual arguments or as arrays
+     * of indexes.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {...(number|number[]|string|string[])} [index] The indexes of `collection`
+     *   to retrieve, specified as individual indexes or arrays of indexes.
+     * @returns {Array} Returns a new array of elements corresponding to the
+     *  provided indexes.
+     * @example
+     *
+     * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
+     * // => ['a', 'c', 'e']
+     *
+     * _.at(['fred', 'barney', 'pebbles'], 0, 2);
+     * // => ['fred', 'pebbles']
+     */
+    function at(collection) {
+      var args = arguments,
+          index = -1,
+          props = baseFlatten(args, true, false, 1),
+          length = (args[2] && args[2][args[1]] === collection) ? 1 : props.length,
+          result = Array(length);
+
+      while(++index < length) {
+        result[index] = collection[props[index]];
+      }
+      return result;
+    }
+
+    /**
+     * Checks if a given value is present in a collection using strict equality
+     * for comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the
+     * offset from the end of the collection.
+     *
+     * @static
+     * @memberOf _
+     * @alias include
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {*} target The value to check for.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @returns {boolean} Returns `true` if the `target` element is found, else `false`.
+     * @example
+     *
+     * _.contains([1, 2, 3], 1);
+     * // => true
+     *
+     * _.contains([1, 2, 3], 1, 2);
+     * // => false
+     *
+     * _.contains({ 'name': 'fred', 'age': 40 }, 'fred');
+     * // => true
+     *
+     * _.contains('pebbles', 'eb');
+     * // => true
+     */
+    function contains(collection, target, fromIndex) {
+      var index = -1,
+          indexOf = getIndexOf(),
+          length = collection ? collection.length : 0,
+          result = false;
+
+      fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;
+      if (isArray(collection)) {
+        result = indexOf(collection, target, fromIndex) > -1;
+      } else if (typeof length == 'number') {
+        result = (isString(collection) ? collection.indexOf(target, fromIndex) : indexOf(collection, target, fromIndex)) > -1;
+      } else {
+        forOwn(collection, function(value) {
+          if (++index >= fromIndex) {
+            return !(result = value === target);
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of `collection` through the callback. The corresponding value
+     * of each key is the number of times the key was returned by the callback.
+     * The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
+     * // => { '4': 1, '6': 2 }
+     *
+     * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
+     * // => { '4': 1, '6': 2 }
+     *
+     * _.countBy(['one', 'two', 'three'], 'length');
+     * // => { '3': 2, '5': 1 }
+     */
+    var countBy = createAggregator(function(result, value, key) {
+      (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
+    });
+
+    /**
+     * Checks if the given callback returns truey value for **all** elements of
+     * a collection. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias all
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {boolean} Returns `true` if all elements passed the callback check,
+     *  else `false`.
+     * @example
+     *
+     * _.every([true, 1, null, 'yes']);
+     * // => false
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.every(characters, 'age');
+     * // => true
+     *
+     * // using "_.where" callback shorthand
+     * _.every(characters, { 'age': 36 });
+     * // => false
+     */
+    function every(collection, callback, thisArg) {
+      var result = true;
+      callback = lodash.createCallback(callback, thisArg, 3);
+
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      if (typeof length == 'number') {
+        while (++index < length) {
+          if (!(result = !!callback(collection[index], index, collection))) {
+            break;
+          }
+        }
+      } else {
+        forOwn(collection, function(value, index, collection) {
+          return (result = !!callback(value, index, collection));
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Iterates over elements of a collection, returning an array of all elements
+     * the callback returns truey for. The callback is bound to `thisArg` and
+     * invoked with three arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias select
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new array of elements that passed the callback check.
+     * @example
+     *
+     * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
+     * // => [2, 4, 6]
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36, 'blocked': false },
+     *   { 'name': 'fred',   'age': 40, 'blocked': true }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.filter(characters, 'blocked');
+     * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }]
+     *
+     * // using "_.where" callback shorthand
+     * _.filter(characters, { 'age': 36 });
+     * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }]
+     */
+    function filter(collection, callback, thisArg) {
+      var result = [];
+      callback = lodash.createCallback(callback, thisArg, 3);
+
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      if (typeof length == 'number') {
+        while (++index < length) {
+          var value = collection[index];
+          if (callback(value, index, collection)) {
+            result.push(value);
+          }
+        }
+      } else {
+        forOwn(collection, function(value, index, collection) {
+          if (callback(value, index, collection)) {
+            result.push(value);
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Iterates over elements of a collection, returning the first element that
+     * the callback returns truey for. The callback is bound to `thisArg` and
+     * invoked with three arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias detect, findWhere
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the found element, else `undefined`.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36, 'blocked': false },
+     *   { 'name': 'fred',    'age': 40, 'blocked': true },
+     *   { 'name': 'pebbles', 'age': 1,  'blocked': false }
+     * ];
+     *
+     * _.find(characters, function(chr) {
+     *   return chr.age < 40;
+     * });
+     * // => { 'name': 'barney', 'age': 36, 'blocked': false }
+     *
+     * // using "_.where" callback shorthand
+     * _.find(characters, { 'age': 1 });
+     * // =>  { 'name': 'pebbles', 'age': 1, 'blocked': false }
+     *
+     * // using "_.pluck" callback shorthand
+     * _.find(characters, 'blocked');
+     * // => { 'name': 'fred', 'age': 40, 'blocked': true }
+     */
+    function find(collection, callback, thisArg) {
+      callback = lodash.createCallback(callback, thisArg, 3);
+
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      if (typeof length == 'number') {
+        while (++index < length) {
+          var value = collection[index];
+          if (callback(value, index, collection)) {
+            return value;
+          }
+        }
+      } else {
+        var result;
+        forOwn(collection, function(value, index, collection) {
+          if (callback(value, index, collection)) {
+            result = value;
+            return false;
+          }
+        });
+        return result;
+      }
+    }
+
+    /**
+     * This method is like `_.find` except that it iterates over elements
+     * of a `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the found element, else `undefined`.
+     * @example
+     *
+     * _.findLast([1, 2, 3, 4], function(num) {
+     *   return num % 2 == 1;
+     * });
+     * // => 3
+     */
+    function findLast(collection, callback, thisArg) {
+      var result;
+      callback = lodash.createCallback(callback, thisArg, 3);
+      forEachRight(collection, function(value, index, collection) {
+        if (callback(value, index, collection)) {
+          result = value;
+          return false;
+        }
+      });
+      return result;
+    }
+
+    /**
+     * Iterates over elements of a collection, executing the callback for each
+     * element. The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, index|key, collection). Callbacks may exit iteration early by
+     * explicitly returning `false`.
+     *
+     * Note: As with other "Collections" methods, objects with a `length` property
+     * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
+     * may be used for object iteration.
+     *
+     * @static
+     * @memberOf _
+     * @alias each
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array|Object|string} Returns `collection`.
+     * @example
+     *
+     * _([1, 2, 3]).forEach(function(num) { console.log(num); }).join(',');
+     * // => logs each number and returns '1,2,3'
+     *
+     * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { console.log(num); });
+     * // => logs each number and returns the object (property order is not guaranteed across environments)
+     */
+    function forEach(collection, callback, thisArg) {
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
+      if (typeof length == 'number') {
+        while (++index < length) {
+          if (callback(collection[index], index, collection) === false) {
+            break;
+          }
+        }
+      } else {
+        forOwn(collection, callback);
+      }
+      return collection;
+    }
+
+    /**
+     * This method is like `_.forEach` except that it iterates over elements
+     * of a `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @alias eachRight
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array|Object|string} Returns `collection`.
+     * @example
+     *
+     * _([1, 2, 3]).forEachRight(function(num) { console.log(num); }).join(',');
+     * // => logs each number from right to left and returns '3,2,1'
+     */
+    function forEachRight(collection, callback, thisArg) {
+      var length = collection ? collection.length : 0;
+      callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
+      if (typeof length == 'number') {
+        while (length--) {
+          if (callback(collection[length], length, collection) === false) {
+            break;
+          }
+        }
+      } else {
+        var props = keys(collection);
+        length = props.length;
+        forOwn(collection, function(value, key, collection) {
+          key = props ? props[--length] : --length;
+          return callback(collection[key], key, collection);
+        });
+      }
+      return collection;
+    }
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of a collection through the callback. The corresponding value
+     * of each key is an array of the elements responsible for generating the key.
+     * The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
+     * // => { '4': [4.2], '6': [6.1, 6.4] }
+     *
+     * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
+     * // => { '4': [4.2], '6': [6.1, 6.4] }
+     *
+     * // using "_.pluck" callback shorthand
+     * _.groupBy(['one', 'two', 'three'], 'length');
+     * // => { '3': ['one', 'two'], '5': ['three'] }
+     */
+    var groupBy = createAggregator(function(result, value, key) {
+      (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
+    });
+
+    /**
+     * Creates an object composed of keys generated from the results of running
+     * each element of the collection through the given callback. The corresponding
+     * value of each key is the last element responsible for generating the key.
+     * The callback is bound to `thisArg` and invoked with three arguments;
+     * (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Object} Returns the composed aggregate object.
+     * @example
+     *
+     * var keys = [
+     *   { 'dir': 'left', 'code': 97 },
+     *   { 'dir': 'right', 'code': 100 }
+     * ];
+     *
+     * _.indexBy(keys, 'dir');
+     * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+     *
+     * _.indexBy(keys, function(key) { return String.fromCharCode(key.code); });
+     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+     *
+     * _.indexBy(characters, function(key) { this.fromCharCode(key.code); }, String);
+     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+     */
+    var indexBy = createAggregator(function(result, value, key) {
+      result[key] = value;
+    });
+
+    /**
+     * Invokes the method named by `methodName` on each element in the `collection`
+     * returning an array of the results of each invoked method. Additional arguments
+     * will be provided to each invoked method. If `methodName` is a function it
+     * will be invoked for, and `this` bound to, each element in the `collection`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|string} methodName The name of the method to invoke or
+     *  the function invoked per iteration.
+     * @param {...*} [arg] Arguments to invoke the method with.
+     * @returns {Array} Returns a new array of the results of each invoked method.
+     * @example
+     *
+     * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
+     * // => [[1, 5, 7], [1, 2, 3]]
+     *
+     * _.invoke([123, 456], String.prototype.split, '');
+     * // => [['1', '2', '3'], ['4', '5', '6']]
+     */
+    function invoke(collection, methodName) {
+      var args = slice(arguments, 2),
+          index = -1,
+          isFunc = typeof methodName == 'function',
+          length = collection ? collection.length : 0,
+          result = Array(typeof length == 'number' ? length : 0);
+
+      forEach(collection, function(value) {
+        result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
+      });
+      return result;
+    }
+
+    /**
+     * Creates an array of values by running each element in the collection
+     * through the callback. The callback is bound to `thisArg` and invoked with
+     * three arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias collect
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new array of the results of each `callback` execution.
+     * @example
+     *
+     * _.map([1, 2, 3], function(num) { return num * 3; });
+     * // => [3, 6, 9]
+     *
+     * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
+     * // => [3, 6, 9] (property order is not guaranteed across environments)
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.map(characters, 'name');
+     * // => ['barney', 'fred']
+     */
+    function map(collection, callback, thisArg) {
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      callback = lodash.createCallback(callback, thisArg, 3);
+      if (typeof length == 'number') {
+        var result = Array(length);
+        while (++index < length) {
+          result[index] = callback(collection[index], index, collection);
+        }
+      } else {
+        result = [];
+        forOwn(collection, function(value, key, collection) {
+          result[++index] = callback(value, key, collection);
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Retrieves the maximum value of a collection. If the collection is empty or
+     * falsey `-Infinity` is returned. If a callback is provided it will be executed
+     * for each value in the collection to generate the criterion by which the value
+     * is ranked. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, index, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the maximum value.
+     * @example
+     *
+     * _.max([4, 2, 8, 6]);
+     * // => 8
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * _.max(characters, function(chr) { return chr.age; });
+     * // => { 'name': 'fred', 'age': 40 };
+     *
+     * // using "_.pluck" callback shorthand
+     * _.max(characters, 'age');
+     * // => { 'name': 'fred', 'age': 40 };
+     */
+    function max(collection, callback, thisArg) {
+      var computed = -Infinity,
+          result = computed;
+
+      // allows working with functions like `_.map` without using
+      // their `index` argument as a callback
+      if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) {
+        callback = null;
+      }
+      if (callback == null && isArray(collection)) {
+        var index = -1,
+            length = collection.length;
+
+        while (++index < length) {
+          var value = collection[index];
+          if (value > result) {
+            result = value;
+          }
+        }
+      } else {
+        callback = (callback == null && isString(collection))
+          ? charAtCallback
+          : lodash.createCallback(callback, thisArg, 3);
+
+        forEach(collection, function(value, index, collection) {
+          var current = callback(value, index, collection);
+          if (current > computed) {
+            computed = current;
+            result = value;
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Retrieves the minimum value of a collection. If the collection is empty or
+     * falsey `Infinity` is returned. If a callback is provided it will be executed
+     * for each value in the collection to generate the criterion by which the value
+     * is ranked. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, index, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the minimum value.
+     * @example
+     *
+     * _.min([4, 2, 8, 6]);
+     * // => 2
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * _.min(characters, function(chr) { return chr.age; });
+     * // => { 'name': 'barney', 'age': 36 };
+     *
+     * // using "_.pluck" callback shorthand
+     * _.min(characters, 'age');
+     * // => { 'name': 'barney', 'age': 36 };
+     */
+    function min(collection, callback, thisArg) {
+      var computed = Infinity,
+          result = computed;
+
+      // allows working with functions like `_.map` without using
+      // their `index` argument as a callback
+      if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) {
+        callback = null;
+      }
+      if (callback == null && isArray(collection)) {
+        var index = -1,
+            length = collection.length;
+
+        while (++index < length) {
+          var value = collection[index];
+          if (value < result) {
+            result = value;
+          }
+        }
+      } else {
+        callback = (callback == null && isString(collection))
+          ? charAtCallback
+          : lodash.createCallback(callback, thisArg, 3);
+
+        forEach(collection, function(value, index, collection) {
+          var current = callback(value, index, collection);
+          if (current < computed) {
+            computed = current;
+            result = value;
+          }
+        });
+      }
+      return result;
+    }
+
+    /**
+     * Retrieves the value of a specified property from all elements in the collection.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {string} property The name of the property to pluck.
+     * @returns {Array} Returns a new array of property values.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * _.pluck(characters, 'name');
+     * // => ['barney', 'fred']
+     */
+    var pluck = map;
+
+    /**
+     * Reduces a collection to a value which is the accumulated result of running
+     * each element in the collection through the callback, where each successive
+     * callback execution consumes the return value of the previous execution. If
+     * `accumulator` is not provided the first element of the collection will be
+     * used as the initial `accumulator` value. The callback is bound to `thisArg`
+     * and invoked with four arguments; (accumulator, value, index|key, collection).
+     *
+     * @static
+     * @memberOf _
+     * @alias foldl, inject
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [accumulator] Initial value of the accumulator.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the accumulated value.
+     * @example
+     *
+     * var sum = _.reduce([1, 2, 3], function(sum, num) {
+     *   return sum + num;
+     * });
+     * // => 6
+     *
+     * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+     *   result[key] = num * 3;
+     *   return result;
+     * }, {});
+     * // => { 'a': 3, 'b': 6, 'c': 9 }
+     */
+    function reduce(collection, callback, accumulator, thisArg) {
+      if (!collection) return accumulator;
+      var noaccum = arguments.length < 3;
+      callback = lodash.createCallback(callback, thisArg, 4);
+
+      var index = -1,
+          length = collection.length;
+
+      if (typeof length == 'number') {
+        if (noaccum) {
+          accumulator = collection[++index];
+        }
+        while (++index < length) {
+          accumulator = callback(accumulator, collection[index], index, collection);
+        }
+      } else {
+        forOwn(collection, function(value, index, collection) {
+          accumulator = noaccum
+            ? (noaccum = false, value)
+            : callback(accumulator, value, index, collection)
+        });
+      }
+      return accumulator;
+    }
+
+    /**
+     * This method is like `_.reduce` except that it iterates over elements
+     * of a `collection` from right to left.
+     *
+     * @static
+     * @memberOf _
+     * @alias foldr
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function} [callback=identity] The function called per iteration.
+     * @param {*} [accumulator] Initial value of the accumulator.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the accumulated value.
+     * @example
+     *
+     * var list = [[0, 1], [2, 3], [4, 5]];
+     * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
+     * // => [4, 5, 2, 3, 0, 1]
+     */
+    function reduceRight(collection, callback, accumulator, thisArg) {
+      var noaccum = arguments.length < 3;
+      callback = lodash.createCallback(callback, thisArg, 4);
+      forEachRight(collection, function(value, index, collection) {
+        accumulator = noaccum
+          ? (noaccum = false, value)
+          : callback(accumulator, value, index, collection);
+      });
+      return accumulator;
+    }
+
+    /**
+     * The opposite of `_.filter` this method returns the elements of a
+     * collection that the callback does **not** return truey for.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new array of elements that failed the callback check.
+     * @example
+     *
+     * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
+     * // => [1, 3, 5]
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36, 'blocked': false },
+     *   { 'name': 'fred',   'age': 40, 'blocked': true }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.reject(characters, 'blocked');
+     * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }]
+     *
+     * // using "_.where" callback shorthand
+     * _.reject(characters, { 'age': 36 });
+     * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }]
+     */
+    function reject(collection, callback, thisArg) {
+      callback = lodash.createCallback(callback, thisArg, 3);
+      return filter(collection, function(value, index, collection) {
+        return !callback(value, index, collection);
+      });
+    }
+
+    /**
+     * Retrieves a random element or `n` random elements from a collection.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to sample.
+     * @param {number} [n] The number of elements to sample.
+     * @param- {Object} [guard] Allows working with functions like `_.map`
+     *  without using their `index` arguments as `n`.
+     * @returns {Array} Returns the random sample(s) of `collection`.
+     * @example
+     *
+     * _.sample([1, 2, 3, 4]);
+     * // => 2
+     *
+     * _.sample([1, 2, 3, 4], 2);
+     * // => [3, 1]
+     */
+    function sample(collection, n, guard) {
+      if (collection && typeof collection.length != 'number') {
+        collection = values(collection);
+      }
+      if (n == null || guard) {
+        return collection ? collection[baseRandom(0, collection.length - 1)] : undefined;
+      }
+      var result = shuffle(collection);
+      result.length = nativeMin(nativeMax(0, n), result.length);
+      return result;
+    }
+
+    /**
+     * Creates an array of shuffled values, using a version of the Fisher-Yates
+     * shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to shuffle.
+     * @returns {Array} Returns a new shuffled collection.
+     * @example
+     *
+     * _.shuffle([1, 2, 3, 4, 5, 6]);
+     * // => [4, 1, 6, 3, 5, 2]
+     */
+    function shuffle(collection) {
+      var index = -1,
+          length = collection ? collection.length : 0,
+          result = Array(typeof length == 'number' ? length : 0);
+
+      forEach(collection, function(value) {
+        var rand = baseRandom(0, ++index);
+        result[index] = result[rand];
+        result[rand] = value;
+      });
+      return result;
+    }
+
+    /**
+     * Gets the size of the `collection` by returning `collection.length` for arrays
+     * and array-like objects or the number of own enumerable properties for objects.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to inspect.
+     * @returns {number} Returns `collection.length` or number of own enumerable properties.
+     * @example
+     *
+     * _.size([1, 2]);
+     * // => 2
+     *
+     * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+     * // => 3
+     *
+     * _.size('pebbles');
+     * // => 7
+     */
+    function size(collection) {
+      var length = collection ? collection.length : 0;
+      return typeof length == 'number' ? length : keys(collection).length;
+    }
+
+    /**
+     * Checks if the callback returns a truey value for **any** element of a
+     * collection. The function returns as soon as it finds a passing value and
+     * does not iterate over the entire collection. The callback is bound to
+     * `thisArg` and invoked with three arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias any
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {boolean} Returns `true` if any element passed the callback check,
+     *  else `false`.
+     * @example
+     *
+     * _.some([null, 0, 'yes', false], Boolean);
+     * // => true
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36, 'blocked': false },
+     *   { 'name': 'fred',   'age': 40, 'blocked': true }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.some(characters, 'blocked');
+     * // => true
+     *
+     * // using "_.where" callback shorthand
+     * _.some(characters, { 'age': 1 });
+     * // => false
+     */
+    function some(collection, callback, thisArg) {
+      var result;
+      callback = lodash.createCallback(callback, thisArg, 3);
+
+      var index = -1,
+          length = collection ? collection.length : 0;
+
+      if (typeof length == 'number') {
+        while (++index < length) {
+          if ((result = callback(collection[index], index, collection))) {
+            break;
+          }
+        }
+      } else {
+        forOwn(collection, function(value, index, collection) {
+          return !(result = callback(value, index, collection));
+        });
+      }
+      return !!result;
+    }
+
+    /**
+     * Creates an array of elements, sorted in ascending order by the results of
+     * running each element in a collection through the callback. This method
+     * performs a stable sort, that is, it will preserve the original sort order
+     * of equal elements. The callback is bound to `thisArg` and invoked with
+     * three arguments; (value, index|key, collection).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an array of property names is provided for `callback` the collection
+     * will be sorted by each property value.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Array|Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new array of sorted elements.
+     * @example
+     *
+     * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
+     * // => [3, 1, 2]
+     *
+     * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
+     * // => [3, 1, 2]
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36 },
+     *   { 'name': 'fred',    'age': 40 },
+     *   { 'name': 'barney',  'age': 26 },
+     *   { 'name': 'fred',    'age': 30 }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.map(_.sortBy(characters, 'age'), _.values);
+     * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]]
+     *
+     * // sorting by multiple properties
+     * _.map(_.sortBy(characters, ['name', 'age']), _.values);
+     * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
+     */
+    function sortBy(collection, callback, thisArg) {
+      var index = -1,
+          isArr = isArray(callback),
+          length = collection ? collection.length : 0,
+          result = Array(typeof length == 'number' ? length : 0);
+
+      if (!isArr) {
+        callback = lodash.createCallback(callback, thisArg, 3);
+      }
+      forEach(collection, function(value, key, collection) {
+        var object = result[++index] = getObject();
+        if (isArr) {
+          object.criteria = map(callback, function(key) { return value[key]; });
+        } else {
+          (object.criteria = getArray())[0] = callback(value, key, collection);
+        }
+        object.index = index;
+        object.value = value;
+      });
+
+      length = result.length;
+      result.sort(compareAscending);
+      while (length--) {
+        var object = result[length];
+        result[length] = object.value;
+        if (!isArr) {
+          releaseArray(object.criteria);
+        }
+        releaseObject(object);
+      }
+      return result;
+    }
+
+    /**
+     * Converts the `collection` to an array.
+     *
+     * @static
+     * @memberOf _
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to convert.
+     * @returns {Array} Returns the new converted array.
+     * @example
+     *
+     * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
+     * // => [2, 3, 4]
+     */
+    function toArray(collection) {
+      if (collection && typeof collection.length == 'number') {
+        return slice(collection);
+      }
+      return values(collection);
+    }
+
+    /**
+     * Performs a deep comparison of each element in a `collection` to the given
+     * `properties` object, returning an array of all elements that have equivalent
+     * property values.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Collections
+     * @param {Array|Object|string} collection The collection to iterate over.
+     * @param {Object} props The object of property values to filter by.
+     * @returns {Array} Returns a new array of elements that have the given properties.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36, 'pets': ['hoppy'] },
+     *   { 'name': 'fred',   'age': 40, 'pets': ['baby puss', 'dino'] }
+     * ];
+     *
+     * _.where(characters, { 'age': 36 });
+     * // => [{ 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }]
+     *
+     * _.where(characters, { 'pets': ['dino'] });
+     * // => [{ 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] }]
+     */
+    var where = filter;
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates an array with all falsey values removed. The values `false`, `null`,
+     * `0`, `""`, `undefined`, and `NaN` are all falsey.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to compact.
+     * @returns {Array} Returns a new array of filtered values.
+     * @example
+     *
+     * _.compact([0, 1, false, 2, '', 3]);
+     * // => [1, 2, 3]
+     */
+    function compact(array) {
+      var index = -1,
+          length = array ? array.length : 0,
+          result = [];
+
+      while (++index < length) {
+        var value = array[index];
+        if (value) {
+          result.push(value);
+        }
+      }
+      return result;
+    }
+
+    /**
+     * Creates an array excluding all values of the provided arrays using strict
+     * equality for comparisons, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to process.
+     * @param {...Array} [values] The arrays of values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
+     * @example
+     *
+     * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
+     * // => [1, 3, 4]
+     */
+    function difference(array) {
+      return baseDifference(array, baseFlatten(arguments, true, true, 1));
+    }
+
+    /**
+     * This method is like `_.find` except that it returns the index of the first
+     * element that passes the callback check, instead of the element itself.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to search.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {number} Returns the index of the found element, else `-1`.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36, 'blocked': false },
+     *   { 'name': 'fred',    'age': 40, 'blocked': true },
+     *   { 'name': 'pebbles', 'age': 1,  'blocked': false }
+     * ];
+     *
+     * _.findIndex(characters, function(chr) {
+     *   return chr.age < 20;
+     * });
+     * // => 2
+     *
+     * // using "_.where" callback shorthand
+     * _.findIndex(characters, { 'age': 36 });
+     * // => 0
+     *
+     * // using "_.pluck" callback shorthand
+     * _.findIndex(characters, 'blocked');
+     * // => 1
+     */
+    function findIndex(array, callback, thisArg) {
+      var index = -1,
+          length = array ? array.length : 0;
+
+      callback = lodash.createCallback(callback, thisArg, 3);
+      while (++index < length) {
+        if (callback(array[index], index, array)) {
+          return index;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * This method is like `_.findIndex` except that it iterates over elements
+     * of a `collection` from right to left.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to search.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {number} Returns the index of the found element, else `-1`.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36, 'blocked': true },
+     *   { 'name': 'fred',    'age': 40, 'blocked': false },
+     *   { 'name': 'pebbles', 'age': 1,  'blocked': true }
+     * ];
+     *
+     * _.findLastIndex(characters, function(chr) {
+     *   return chr.age > 30;
+     * });
+     * // => 1
+     *
+     * // using "_.where" callback shorthand
+     * _.findLastIndex(characters, { 'age': 36 });
+     * // => 0
+     *
+     * // using "_.pluck" callback shorthand
+     * _.findLastIndex(characters, 'blocked');
+     * // => 2
+     */
+    function findLastIndex(array, callback, thisArg) {
+      var length = array ? array.length : 0;
+      callback = lodash.createCallback(callback, thisArg, 3);
+      while (length--) {
+        if (callback(array[length], length, array)) {
+          return length;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * Gets the first element or first `n` elements of an array. If a callback
+     * is provided elements at the beginning of the array are returned as long
+     * as the callback returns truey. The callback is bound to `thisArg` and
+     * invoked with three arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias head, take
+     * @category Arrays
+     * @param {Array} array The array to query.
+     * @param {Function|Object|number|string} [callback] The function called
+     *  per element or the number of elements to return. If a property name or
+     *  object is provided it will be used to create a "_.pluck" or "_.where"
+     *  style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the first element(s) of `array`.
+     * @example
+     *
+     * _.first([1, 2, 3]);
+     * // => 1
+     *
+     * _.first([1, 2, 3], 2);
+     * // => [1, 2]
+     *
+     * _.first([1, 2, 3], function(num) {
+     *   return num < 3;
+     * });
+     * // => [1, 2]
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'blocked': true,  'employer': 'slate' },
+     *   { 'name': 'fred',    'blocked': false, 'employer': 'slate' },
+     *   { 'name': 'pebbles', 'blocked': true,  'employer': 'na' }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.first(characters, 'blocked');
+     * // => [{ 'name': 'barney', 'blocked': true, 'employer': 'slate' }]
+     *
+     * // using "_.where" callback shorthand
+     * _.pluck(_.first(characters, { 'employer': 'slate' }), 'name');
+     * // => ['barney', 'fred']
+     */
+    function first(array, callback, thisArg) {
+      var n = 0,
+          length = array ? array.length : 0;
+
+      if (typeof callback != 'number' && callback != null) {
+        var index = -1;
+        callback = lodash.createCallback(callback, thisArg, 3);
+        while (++index < length && callback(array[index], index, array)) {
+          n++;
+        }
+      } else {
+        n = callback;
+        if (n == null || thisArg) {
+          return array ? array[0] : undefined;
+        }
+      }
+      return slice(array, 0, nativeMin(nativeMax(0, n), length));
+    }
+
+    /**
+     * Flattens a nested array (the nesting can be to any depth). If `isShallow`
+     * is truey, the array will only be flattened a single level. If a callback
+     * is provided each element of the array is passed through the callback before
+     * flattening. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to flatten.
+     * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new flattened array.
+     * @example
+     *
+     * _.flatten([1, [2], [3, [[4]]]]);
+     * // => [1, 2, 3, 4];
+     *
+     * _.flatten([1, [2], [3, [[4]]]], true);
+     * // => [1, 2, 3, [[4]]];
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 30, 'pets': ['hoppy'] },
+     *   { 'name': 'fred',   'age': 40, 'pets': ['baby puss', 'dino'] }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.flatten(characters, 'pets');
+     * // => ['hoppy', 'baby puss', 'dino']
+     */
+    function flatten(array, isShallow, callback, thisArg) {
+      // juggle arguments
+      if (typeof isShallow != 'boolean' && isShallow != null) {
+        thisArg = callback;
+        callback = (typeof isShallow != 'function' && thisArg && thisArg[isShallow] === array) ? null : isShallow;
+        isShallow = false;
+      }
+      if (callback != null) {
+        array = map(array, callback, thisArg);
+      }
+      return baseFlatten(array, isShallow);
+    }
+
+    /**
+     * Gets the index at which the first occurrence of `value` is found using
+     * strict equality for comparisons, i.e. `===`. If the array is already sorted
+     * providing `true` for `fromIndex` will run a faster binary search.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to search.
+     * @param {*} value The value to search for.
+     * @param {boolean|number} [fromIndex=0] The index to search from or `true`
+     *  to perform a binary search on a sorted array.
+     * @returns {number} Returns the index of the matched value or `-1`.
+     * @example
+     *
+     * _.indexOf([1, 2, 3, 1, 2, 3], 2);
+     * // => 1
+     *
+     * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
+     * // => 4
+     *
+     * _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
+     * // => 2
+     */
+    function indexOf(array, value, fromIndex) {
+      if (typeof fromIndex == 'number') {
+        var length = array ? array.length : 0;
+        fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0);
+      } else if (fromIndex) {
+        var index = sortedIndex(array, value);
+        return array[index] === value ? index : -1;
+      }
+      return baseIndexOf(array, value, fromIndex);
+    }
+
+    /**
+     * Gets all but the last element or last `n` elements of an array. If a
+     * callback is provided elements at the end of the array are excluded from
+     * the result as long as the callback returns truey. The callback is bound
+     * to `thisArg` and invoked with three arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to query.
+     * @param {Function|Object|number|string} [callback=1] The function called
+     *  per element or the number of elements to exclude. If a property name or
+     *  object is provided it will be used to create a "_.pluck" or "_.where"
+     *  style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a slice of `array`.
+     * @example
+     *
+     * _.initial([1, 2, 3]);
+     * // => [1, 2]
+     *
+     * _.initial([1, 2, 3], 2);
+     * // => [1]
+     *
+     * _.initial([1, 2, 3], function(num) {
+     *   return num > 1;
+     * });
+     * // => [1]
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'blocked': false, 'employer': 'slate' },
+     *   { 'name': 'fred',    'blocked': true,  'employer': 'slate' },
+     *   { 'name': 'pebbles', 'blocked': true,  'employer': 'na' }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.initial(characters, 'blocked');
+     * // => [{ 'name': 'barney',  'blocked': false, 'employer': 'slate' }]
+     *
+     * // using "_.where" callback shorthand
+     * _.pluck(_.initial(characters, { 'employer': 'na' }), 'name');
+     * // => ['barney', 'fred']
+     */
+    function initial(array, callback, thisArg) {
+      var n = 0,
+          length = array ? array.length : 0;
+
+      if (typeof callback != 'number' && callback != null) {
+        var index = length;
+        callback = lodash.createCallback(callback, thisArg, 3);
+        while (index-- && callback(array[index], index, array)) {
+          n++;
+        }
+      } else {
+        n = (callback == null || thisArg) ? 1 : callback || n;
+      }
+      return slice(array, 0, nativeMin(nativeMax(0, length - n), length));
+    }
+
+    /**
+     * Creates an array of unique values present in all provided arrays using
+     * strict equality for comparisons, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {...Array} [array] The arrays to inspect.
+     * @returns {Array} Returns an array of shared values.
+     * @example
+     *
+     * _.intersection([1, 2, 3], [5, 2, 1, 4], [2, 1]);
+     * // => [1, 2]
+     */
+    function intersection() {
+      var args = [],
+          argsIndex = -1,
+          argsLength = arguments.length,
+          caches = getArray(),
+          indexOf = getIndexOf(),
+          trustIndexOf = indexOf === baseIndexOf,
+          seen = getArray();
+
+      while (++argsIndex < argsLength) {
+        var value = arguments[argsIndex];
+        if (isArray(value) || isArguments(value)) {
+          args.push(value);
+          caches.push(trustIndexOf && value.length >= largeArraySize &&
+            createCache(argsIndex ? args[argsIndex] : seen));
+        }
+      }
+      var array = args[0],
+          index = -1,
+          length = array ? array.length : 0,
+          result = [];
+
+      outer:
+      while (++index < length) {
+        var cache = caches[0];
+        value = array[index];
+
+        if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) {
+          argsIndex = argsLength;
+          (cache || seen).push(value);
+          while (--argsIndex) {
+            cache = caches[argsIndex];
+            if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
+              continue outer;
+            }
+          }
+          result.push(value);
+        }
+      }
+      while (argsLength--) {
+        cache = caches[argsLength];
+        if (cache) {
+          releaseObject(cache);
+        }
+      }
+      releaseArray(caches);
+      releaseArray(seen);
+      return result;
+    }
+
+    /**
+     * Gets the last element or last `n` elements of an array. If a callback is
+     * provided elements at the end of the array are returned as long as the
+     * callback returns truey. The callback is bound to `thisArg` and invoked
+     * with three arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to query.
+     * @param {Function|Object|number|string} [callback] The function called
+     *  per element or the number of elements to return. If a property name or
+     *  object is provided it will be used to create a "_.pluck" or "_.where"
+     *  style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {*} Returns the last element(s) of `array`.
+     * @example
+     *
+     * _.last([1, 2, 3]);
+     * // => 3
+     *
+     * _.last([1, 2, 3], 2);
+     * // => [2, 3]
+     *
+     * _.last([1, 2, 3], function(num) {
+     *   return num > 1;
+     * });
+     * // => [2, 3]
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'blocked': false, 'employer': 'slate' },
+     *   { 'name': 'fred',    'blocked': true,  'employer': 'slate' },
+     *   { 'name': 'pebbles', 'blocked': true,  'employer': 'na' }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.pluck(_.last(characters, 'blocked'), 'name');
+     * // => ['fred', 'pebbles']
+     *
+     * // using "_.where" callback shorthand
+     * _.last(characters, { 'employer': 'na' });
+     * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }]
+     */
+    function last(array, callback, thisArg) {
+      var n = 0,
+          length = array ? array.length : 0;
+
+      if (typeof callback != 'number' && callback != null) {
+        var index = length;
+        callback = lodash.createCallback(callback, thisArg, 3);
+        while (index-- && callback(array[index], index, array)) {
+          n++;
+        }
+      } else {
+        n = callback;
+        if (n == null || thisArg) {
+          return array ? array[length - 1] : undefined;
+        }
+      }
+      return slice(array, nativeMax(0, length - n));
+    }
+
+    /**
+     * Gets the index at which the last occurrence of `value` is found using strict
+     * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
+     * as the offset from the end of the collection.
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to search.
+     * @param {*} value The value to search for.
+     * @param {number} [fromIndex=array.length-1] The index to search from.
+     * @returns {number} Returns the index of the matched value or `-1`.
+     * @example
+     *
+     * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
+     * // => 4
+     *
+     * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
+     * // => 1
+     */
+    function lastIndexOf(array, value, fromIndex) {
+      var index = array ? array.length : 0;
+      if (typeof fromIndex == 'number') {
+        index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;
+      }
+      while (index--) {
+        if (array[index] === value) {
+          return index;
+        }
+      }
+      return -1;
+    }
+
+    /**
+     * Removes all provided values from the given array using strict equality for
+     * comparisons, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to modify.
+     * @param {...*} [value] The values to remove.
+     * @returns {Array} Returns `array`.
+     * @example
+     *
+     * var array = [1, 2, 3, 1, 2, 3];
+     * _.pull(array, 2, 3);
+     * console.log(array);
+     * // => [1, 1]
+     */
+    function pull(array) {
+      var args = arguments,
+          argsIndex = 0,
+          argsLength = args.length,
+          length = array ? array.length : 0;
+
+      while (++argsIndex < argsLength) {
+        var index = -1,
+            value = args[argsIndex];
+        while (++index < length) {
+          if (array[index] === value) {
+            splice.call(array, index--, 1);
+            length--;
+          }
+        }
+      }
+      return array;
+    }
+
+    /**
+     * Creates an array of numbers (positive and/or negative) progressing from
+     * `start` up to but not including `end`. If `start` is less than `stop` a
+     * zero-length range is created unless a negative `step` is specified.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {number} [start=0] The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} [step=1] The value to increment or decrement by.
+     * @returns {Array} Returns a new range array.
+     * @example
+     *
+     * _.range(4);
+     * // => [0, 1, 2, 3]
+     *
+     * _.range(1, 5);
+     * // => [1, 2, 3, 4]
+     *
+     * _.range(0, 20, 5);
+     * // => [0, 5, 10, 15]
+     *
+     * _.range(0, -4, -1);
+     * // => [0, -1, -2, -3]
+     *
+     * _.range(1, 4, 0);
+     * // => [1, 1, 1]
+     *
+     * _.range(0);
+     * // => []
+     */
+    function range(start, end, step) {
+      start = +start || 0;
+      step = typeof step == 'number' ? step : (+step || 1);
+
+      if (end == null) {
+        end = start;
+        start = 0;
+      }
+      // use `Array(length)` so engines like Chakra and V8 avoid slower modes
+      // http://youtu.be/XAqIpGU8ZZk#t=17m25s
+      var index = -1,
+          length = nativeMax(0, ceil((end - start) / (step || 1))),
+          result = Array(length);
+
+      while (++index < length) {
+        result[index] = start;
+        start += step;
+      }
+      return result;
+    }
+
+    /**
+     * Removes all elements from an array that the callback returns truey for
+     * and returns an array of removed elements. The callback is bound to `thisArg`
+     * and invoked with three arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to modify.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a new array of removed elements.
+     * @example
+     *
+     * var array = [1, 2, 3, 4, 5, 6];
+     * var evens = _.remove(array, function(num) { return num % 2 == 0; });
+     *
+     * console.log(array);
+     * // => [1, 3, 5]
+     *
+     * console.log(evens);
+     * // => [2, 4, 6]
+     */
+    function remove(array, callback, thisArg) {
+      var index = -1,
+          length = array ? array.length : 0,
+          result = [];
+
+      callback = lodash.createCallback(callback, thisArg, 3);
+      while (++index < length) {
+        var value = array[index];
+        if (callback(value, index, array)) {
+          result.push(value);
+          splice.call(array, index--, 1);
+          length--;
+        }
+      }
+      return result;
+    }
+
+    /**
+     * The opposite of `_.initial` this method gets all but the first element or
+     * first `n` elements of an array. If a callback function is provided elements
+     * at the beginning of the array are excluded from the result as long as the
+     * callback returns truey. The callback is bound to `thisArg` and invoked
+     * with three arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias drop, tail
+     * @category Arrays
+     * @param {Array} array The array to query.
+     * @param {Function|Object|number|string} [callback=1] The function called
+     *  per element or the number of elements to exclude. If a property name or
+     *  object is provided it will be used to create a "_.pluck" or "_.where"
+     *  style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a slice of `array`.
+     * @example
+     *
+     * _.rest([1, 2, 3]);
+     * // => [2, 3]
+     *
+     * _.rest([1, 2, 3], 2);
+     * // => [3]
+     *
+     * _.rest([1, 2, 3], function(num) {
+     *   return num < 3;
+     * });
+     * // => [3]
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'blocked': true,  'employer': 'slate' },
+     *   { 'name': 'fred',    'blocked': false,  'employer': 'slate' },
+     *   { 'name': 'pebbles', 'blocked': true, 'employer': 'na' }
+     * ];
+     *
+     * // using "_.pluck" callback shorthand
+     * _.pluck(_.rest(characters, 'blocked'), 'name');
+     * // => ['fred', 'pebbles']
+     *
+     * // using "_.where" callback shorthand
+     * _.rest(characters, { 'employer': 'slate' });
+     * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }]
+     */
+    function rest(array, callback, thisArg) {
+      if (typeof callback != 'number' && callback != null) {
+        var n = 0,
+            index = -1,
+            length = array ? array.length : 0;
+
+        callback = lodash.createCallback(callback, thisArg, 3);
+        while (++index < length && callback(array[index], index, array)) {
+          n++;
+        }
+      } else {
+        n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);
+      }
+      return slice(array, n);
+    }
+
+    /**
+     * Uses a binary search to determine the smallest index at which a value
+     * should be inserted into a given sorted array in order to maintain the sort
+     * order of the array. If a callback is provided it will be executed for
+     * `value` and each element of `array` to compute their sort ranking. The
+     * callback is bound to `thisArg` and invoked with one argument; (value).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to inspect.
+     * @param {*} value The value to evaluate.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {number} Returns the index at which `value` should be inserted
+     *  into `array`.
+     * @example
+     *
+     * _.sortedIndex([20, 30, 50], 40);
+     * // => 2
+     *
+     * // using "_.pluck" callback shorthand
+     * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
+     * // => 2
+     *
+     * var dict = {
+     *   'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
+     * };
+     *
+     * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
+     *   return dict.wordToNumber[word];
+     * });
+     * // => 2
+     *
+     * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
+     *   return this.wordToNumber[word];
+     * }, dict);
+     * // => 2
+     */
+    function sortedIndex(array, value, callback, thisArg) {
+      var low = 0,
+          high = array ? array.length : low;
+
+      // explicitly reference `identity` for better inlining in Firefox
+      callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity;
+      value = callback(value);
+
+      while (low < high) {
+        var mid = (low + high) >>> 1;
+        (callback(array[mid]) < value)
+          ? low = mid + 1
+          : high = mid;
+      }
+      return low;
+    }
+
+    /**
+     * Creates an array of unique values, in order, of the provided arrays using
+     * strict equality for comparisons, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {...Array} [array] The arrays to inspect.
+     * @returns {Array} Returns an array of combined values.
+     * @example
+     *
+     * _.union([1, 2, 3], [5, 2, 1, 4], [2, 1]);
+     * // => [1, 2, 3, 5, 4]
+     */
+    function union() {
+      return baseUniq(baseFlatten(arguments, true, true));
+    }
+
+    /**
+     * Creates a duplicate-value-free version of an array using strict equality
+     * for comparisons, i.e. `===`. If the array is sorted, providing
+     * `true` for `isSorted` will use a faster algorithm. If a callback is provided
+     * each element of `array` is passed through the callback before uniqueness
+     * is computed. The callback is bound to `thisArg` and invoked with three
+     * arguments; (value, index, array).
+     *
+     * If a property name is provided for `callback` the created "_.pluck" style
+     * callback will return the property value of the given element.
+     *
+     * If an object is provided for `callback` the created "_.where" style callback
+     * will return `true` for elements that have the properties of the given object,
+     * else `false`.
+     *
+     * @static
+     * @memberOf _
+     * @alias unique
+     * @category Arrays
+     * @param {Array} array The array to process.
+     * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted.
+     * @param {Function|Object|string} [callback=identity] The function called
+     *  per iteration. If a property name or object is provided it will be used
+     *  to create a "_.pluck" or "_.where" style callback, respectively.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns a duplicate-value-free array.
+     * @example
+     *
+     * _.uniq([1, 2, 1, 3, 1]);
+     * // => [1, 2, 3]
+     *
+     * _.uniq([1, 1, 2, 2, 3], true);
+     * // => [1, 2, 3]
+     *
+     * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); });
+     * // => ['A', 'b', 'C']
+     *
+     * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math);
+     * // => [1, 2.5, 3]
+     *
+     * // using "_.pluck" callback shorthand
+     * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+     * // => [{ 'x': 1 }, { 'x': 2 }]
+     */
+    function uniq(array, isSorted, callback, thisArg) {
+      // juggle arguments
+      if (typeof isSorted != 'boolean' && isSorted != null) {
+        thisArg = callback;
+        callback = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted;
+        isSorted = false;
+      }
+      if (callback != null) {
+        callback = lodash.createCallback(callback, thisArg, 3);
+      }
+      return baseUniq(array, isSorted, callback);
+    }
+
+    /**
+     * Creates an array excluding all provided values using strict equality for
+     * comparisons, i.e. `===`.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {Array} array The array to filter.
+     * @param {...*} [value] The values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
+     * @example
+     *
+     * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
+     * // => [2, 3, 4]
+     */
+    function without(array) {
+      return baseDifference(array, slice(arguments, 1));
+    }
+
+    /**
+     * Creates an array that is the symmetric difference of the provided arrays.
+     * See http://en.wikipedia.org/wiki/Symmetric_difference.
+     *
+     * @static
+     * @memberOf _
+     * @category Arrays
+     * @param {...Array} [array] The arrays to inspect.
+     * @returns {Array} Returns an array of values.
+     * @example
+     *
+     * _.xor([1, 2, 3], [5, 2, 1, 4]);
+     * // => [3, 5, 4]
+     *
+     * _.xor([1, 2, 5], [2, 3, 5], [3, 4, 5]);
+     * // => [1, 4, 5]
+     */
+    function xor() {
+      var index = -1,
+          length = arguments.length;
+
+      while (++index < length) {
+        var array = arguments[index];
+        if (isArray(array) || isArguments(array)) {
+          var result = result
+            ? baseUniq(baseDifference(result, array).concat(baseDifference(array, result)))
+            : array;
+        }
+      }
+      return result || [];
+    }
+
+    /**
+     * Creates an array of grouped elements, the first of which contains the first
+     * elements of the given arrays, the second of which contains the second
+     * elements of the given arrays, and so on.
+     *
+     * @static
+     * @memberOf _
+     * @alias unzip
+     * @category Arrays
+     * @param {...Array} [array] Arrays to process.
+     * @returns {Array} Returns a new array of grouped elements.
+     * @example
+     *
+     * _.zip(['fred', 'barney'], [30, 40], [true, false]);
+     * // => [['fred', 30, true], ['barney', 40, false]]
+     */
+    function zip() {
+      var array = arguments.length > 1 ? arguments : arguments[0],
+          index = -1,
+          length = array ? max(pluck(array, 'length')) : 0,
+          result = Array(length < 0 ? 0 : length);
+
+      while (++index < length) {
+        result[index] = pluck(array, index);
+      }
+      return result;
+    }
+
+    /**
+     * Creates an object composed from arrays of `keys` and `values`. Provide
+     * either a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`
+     * or two arrays, one of `keys` and one of corresponding `values`.
+     *
+     * @static
+     * @memberOf _
+     * @alias object
+     * @category Arrays
+     * @param {Array} keys The array of keys.
+     * @param {Array} [values=[]] The array of values.
+     * @returns {Object} Returns an object composed of the given keys and
+     *  corresponding values.
+     * @example
+     *
+     * _.zipObject(['fred', 'barney'], [30, 40]);
+     * // => { 'fred': 30, 'barney': 40 }
+     */
+    function zipObject(keys, values) {
+      var index = -1,
+          length = keys ? keys.length : 0,
+          result = {};
+
+      if (!values && length && !isArray(keys[0])) {
+        values = [];
+      }
+      while (++index < length) {
+        var key = keys[index];
+        if (values) {
+          result[key] = values[index];
+        } else if (key) {
+          result[key[0]] = key[1];
+        }
+      }
+      return result;
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates a function that executes `func`, with  the `this` binding and
+     * arguments of the created function, only after being called `n` times.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {number} n The number of times the function must be called before
+     *  `func` is executed.
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * var saves = ['profile', 'settings'];
+     *
+     * var done = _.after(saves.length, function() {
+     *   console.log('Done saving!');
+     * });
+     *
+     * _.forEach(saves, function(type) {
+     *   asyncSave({ 'type': type, 'complete': done });
+     * });
+     * // => logs 'Done saving!', after all saves have completed
+     */
+    function after(n, func) {
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      return function() {
+        if (--n < 1) {
+          return func.apply(this, arguments);
+        }
+      };
+    }
+
+    /**
+     * Creates a function that, when called, invokes `func` with the `this`
+     * binding of `thisArg` and prepends any additional `bind` arguments to those
+     * provided to the bound function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to bind.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {...*} [arg] Arguments to be partially applied.
+     * @returns {Function} Returns the new bound function.
+     * @example
+     *
+     * var func = function(greeting) {
+     *   return greeting + ' ' + this.name;
+     * };
+     *
+     * func = _.bind(func, { 'name': 'fred' }, 'hi');
+     * func();
+     * // => 'hi fred'
+     */
+    function bind(func, thisArg) {
+      return arguments.length > 2
+        ? createWrapper(func, 17, slice(arguments, 2), null, thisArg)
+        : createWrapper(func, 1, null, null, thisArg);
+    }
+
+    /**
+     * Binds methods of an object to the object itself, overwriting the existing
+     * method. Method names may be specified as individual arguments or as arrays
+     * of method names. If no method names are provided all the function properties
+     * of `object` will be bound.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Object} object The object to bind and assign the bound methods to.
+     * @param {...string} [methodName] The object method names to
+     *  bind, specified as individual method names or arrays of method names.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * var view = {
+     *   'label': 'docs',
+     *   'onClick': function() { console.log('clicked ' + this.label); }
+     * };
+     *
+     * _.bindAll(view);
+     * jQuery('#docs').on('click', view.onClick);
+     * // => logs 'clicked docs', when the button is clicked
+     */
+    function bindAll(object) {
+      var funcs = arguments.length > 1 ? baseFlatten(arguments, true, false, 1) : functions(object),
+          index = -1,
+          length = funcs.length;
+
+      while (++index < length) {
+        var key = funcs[index];
+        object[key] = createWrapper(object[key], 1, null, null, object);
+      }
+      return object;
+    }
+
+    /**
+     * Creates a function that, when called, invokes the method at `object[key]`
+     * and prepends any additional `bindKey` arguments to those provided to the bound
+     * function. This method differs from `_.bind` by allowing bound functions to
+     * reference methods that will be redefined or don't yet exist.
+     * See http://michaux.ca/articles/lazy-function-definition-pattern.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Object} object The object the method belongs to.
+     * @param {string} key The key of the method.
+     * @param {...*} [arg] Arguments to be partially applied.
+     * @returns {Function} Returns the new bound function.
+     * @example
+     *
+     * var object = {
+     *   'name': 'fred',
+     *   'greet': function(greeting) {
+     *     return greeting + ' ' + this.name;
+     *   }
+     * };
+     *
+     * var func = _.bindKey(object, 'greet', 'hi');
+     * func();
+     * // => 'hi fred'
+     *
+     * object.greet = function(greeting) {
+     *   return greeting + 'ya ' + this.name + '!';
+     * };
+     *
+     * func();
+     * // => 'hiya fred!'
+     */
+    function bindKey(object, key) {
+      return arguments.length > 2
+        ? createWrapper(key, 19, slice(arguments, 2), null, object)
+        : createWrapper(key, 3, null, null, object);
+    }
+
+    /**
+     * Creates a function that is the composition of the provided functions,
+     * where each function consumes the return value of the function that follows.
+     * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.
+     * Each function is executed with the `this` binding of the composed function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {...Function} [func] Functions to compose.
+     * @returns {Function} Returns the new composed function.
+     * @example
+     *
+     * var realNameMap = {
+     *   'pebbles': 'penelope'
+     * };
+     *
+     * var format = function(name) {
+     *   name = realNameMap[name.toLowerCase()] || name;
+     *   return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
+     * };
+     *
+     * var greet = function(formatted) {
+     *   return 'Hiya ' + formatted + '!';
+     * };
+     *
+     * var welcome = _.compose(greet, format);
+     * welcome('pebbles');
+     * // => 'Hiya Penelope!'
+     */
+    function compose() {
+      var funcs = arguments,
+          length = funcs.length;
+
+      while (length--) {
+        if (!isFunction(funcs[length])) {
+          throw new TypeError;
+        }
+      }
+      return function() {
+        var args = arguments,
+            length = funcs.length;
+
+        while (length--) {
+          args = [funcs[length].apply(this, args)];
+        }
+        return args[0];
+      };
+    }
+
+    /**
+     * Creates a function which accepts one or more arguments of `func` that when
+     * invoked either executes `func` returning its result, if all `func` arguments
+     * have been provided, or returns a function that accepts one or more of the
+     * remaining `func` arguments, and so on. The arity of `func` can be specified
+     * if `func.length` is not sufficient.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to curry.
+     * @param {number} [arity=func.length] The arity of `func`.
+     * @returns {Function} Returns the new curried function.
+     * @example
+     *
+     * var curried = _.curry(function(a, b, c) {
+     *   console.log(a + b + c);
+     * });
+     *
+     * curried(1)(2)(3);
+     * // => 6
+     *
+     * curried(1, 2)(3);
+     * // => 6
+     *
+     * curried(1, 2, 3);
+     * // => 6
+     */
+    function curry(func, arity) {
+      arity = typeof arity == 'number' ? arity : (+arity || func.length);
+      return createWrapper(func, 4, null, null, null, arity);
+    }
+
+    /**
+     * Creates a function that will delay the execution of `func` until after
+     * `wait` milliseconds have elapsed since the last time it was invoked.
+     * Provide an options object to indicate that `func` should be invoked on
+     * the leading and/or trailing edge of the `wait` timeout. Subsequent calls
+     * to the debounced function will return the result of the last `func` call.
+     *
+     * Note: If `leading` and `trailing` options are `true` `func` will be called
+     * on the trailing edge of the timeout only if the the debounced function is
+     * invoked more than once during the `wait` timeout.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to debounce.
+     * @param {number} wait The number of milliseconds to delay.
+     * @param {Object} [options] The options object.
+     * @param {boolean} [options.leading=false] Specify execution on the leading edge of the timeout.
+     * @param {number} [options.maxWait] The maximum time `func` is allowed to be delayed before it's called.
+     * @param {boolean} [options.trailing=true] Specify execution on the trailing edge of the timeout.
+     * @returns {Function} Returns the new debounced function.
+     * @example
+     *
+     * // avoid costly calculations while the window size is in flux
+     * var lazyLayout = _.debounce(calculateLayout, 150);
+     * jQuery(window).on('resize', lazyLayout);
+     *
+     * // execute `sendMail` when the click event is fired, debouncing subsequent calls
+     * jQuery('#postbox').on('click', _.debounce(sendMail, 300, {
+     *   'leading': true,
+     *   'trailing': false
+     * });
+     *
+     * // ensure `batchLog` is executed once after 1 second of debounced calls
+     * var source = new EventSource('/stream');
+     * source.addEventListener('message', _.debounce(batchLog, 250, {
+     *   'maxWait': 1000
+     * }, false);
+     */
+    function debounce(func, wait, options) {
+      var args,
+          maxTimeoutId,
+          result,
+          stamp,
+          thisArg,
+          timeoutId,
+          trailingCall,
+          lastCalled = 0,
+          maxWait = false,
+          trailing = true;
+
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      wait = nativeMax(0, wait) || 0;
+      if (options === true) {
+        var leading = true;
+        trailing = false;
+      } else if (isObject(options)) {
+        leading = options.leading;
+        maxWait = 'maxWait' in options && (nativeMax(wait, options.maxWait) || 0);
+        trailing = 'trailing' in options ? options.trailing : trailing;
+      }
+      var delayed = function() {
+        var remaining = wait - (now() - stamp);
+        if (remaining <= 0) {
+          if (maxTimeoutId) {
+            clearTimeout(maxTimeoutId);
+          }
+          var isCalled = trailingCall;
+          maxTimeoutId = timeoutId = trailingCall = undefined;
+          if (isCalled) {
+            lastCalled = now();
+            result = func.apply(thisArg, args);
+            if (!timeoutId && !maxTimeoutId) {
+              args = thisArg = null;
+            }
+          }
+        } else {
+          timeoutId = setTimeout(delayed, remaining);
+        }
+      };
+
+      var maxDelayed = function() {
+        if (timeoutId) {
+          clearTimeout(timeoutId);
+        }
+        maxTimeoutId = timeoutId = trailingCall = undefined;
+        if (trailing || (maxWait !== wait)) {
+          lastCalled = now();
+          result = func.apply(thisArg, args);
+          if (!timeoutId && !maxTimeoutId) {
+            args = thisArg = null;
+          }
+        }
+      };
+
+      return function() {
+        args = arguments;
+        stamp = now();
+        thisArg = this;
+        trailingCall = trailing && (timeoutId || !leading);
+
+        if (maxWait === false) {
+          var leadingCall = leading && !timeoutId;
+        } else {
+          if (!maxTimeoutId && !leading) {
+            lastCalled = stamp;
+          }
+          var remaining = maxWait - (stamp - lastCalled),
+              isCalled = remaining <= 0;
+
+          if (isCalled) {
+            if (maxTimeoutId) {
+              maxTimeoutId = clearTimeout(maxTimeoutId);
+            }
+            lastCalled = stamp;
+            result = func.apply(thisArg, args);
+          }
+          else if (!maxTimeoutId) {
+            maxTimeoutId = setTimeout(maxDelayed, remaining);
+          }
+        }
+        if (isCalled && timeoutId) {
+          timeoutId = clearTimeout(timeoutId);
+        }
+        else if (!timeoutId && wait !== maxWait) {
+          timeoutId = setTimeout(delayed, wait);
+        }
+        if (leadingCall) {
+          isCalled = true;
+          result = func.apply(thisArg, args);
+        }
+        if (isCalled && !timeoutId && !maxTimeoutId) {
+          args = thisArg = null;
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Defers executing the `func` function until the current call stack has cleared.
+     * Additional arguments will be provided to `func` when it is invoked.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to defer.
+     * @param {...*} [arg] Arguments to invoke the function with.
+     * @returns {number} Returns the timer id.
+     * @example
+     *
+     * _.defer(function(text) { console.log(text); }, 'deferred');
+     * // logs 'deferred' after one or more milliseconds
+     */
+    function defer(func) {
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      var args = slice(arguments, 1);
+      return setTimeout(function() { func.apply(undefined, args); }, 1);
+    }
+
+    /**
+     * Executes the `func` function after `wait` milliseconds. Additional arguments
+     * will be provided to `func` when it is invoked.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to delay.
+     * @param {number} wait The number of milliseconds to delay execution.
+     * @param {...*} [arg] Arguments to invoke the function with.
+     * @returns {number} Returns the timer id.
+     * @example
+     *
+     * _.delay(function(text) { console.log(text); }, 1000, 'later');
+     * // => logs 'later' after one second
+     */
+    function delay(func, wait) {
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      var args = slice(arguments, 2);
+      return setTimeout(function() { func.apply(undefined, args); }, wait);
+    }
+
+    /**
+     * Creates a function that memoizes the result of `func`. If `resolver` is
+     * provided it will be used to determine the cache key for storing the result
+     * based on the arguments provided to the memoized function. By default, the
+     * first argument provided to the memoized function is used as the cache key.
+     * The `func` is executed with the `this` binding of the memoized function.
+     * The result cache is exposed as the `cache` property on the memoized function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to have its output memoized.
+     * @param {Function} [resolver] A function used to resolve the cache key.
+     * @returns {Function} Returns the new memoizing function.
+     * @example
+     *
+     * var fibonacci = _.memoize(function(n) {
+     *   return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
+     * });
+     *
+     * fibonacci(9)
+     * // => 34
+     *
+     * var data = {
+     *   'fred': { 'name': 'fred', 'age': 40 },
+     *   'pebbles': { 'name': 'pebbles', 'age': 1 }
+     * };
+     *
+     * // modifying the result cache
+     * var get = _.memoize(function(name) { return data[name]; }, _.identity);
+     * get('pebbles');
+     * // => { 'name': 'pebbles', 'age': 1 }
+     *
+     * get.cache.pebbles.name = 'penelope';
+     * get('pebbles');
+     * // => { 'name': 'penelope', 'age': 1 }
+     */
+    function memoize(func, resolver) {
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      var memoized = function() {
+        var cache = memoized.cache,
+            key = resolver ? resolver.apply(this, arguments) : keyPrefix + arguments[0];
+
+        return hasOwnProperty.call(cache, key)
+          ? cache[key]
+          : (cache[key] = func.apply(this, arguments));
+      }
+      memoized.cache = {};
+      return memoized;
+    }
+
+    /**
+     * Creates a function that is restricted to execute `func` once. Repeat calls to
+     * the function will return the value of the first call. The `func` is executed
+     * with the `this` binding of the created function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * var initialize = _.once(createApplication);
+     * initialize();
+     * initialize();
+     * // `initialize` executes `createApplication` once
+     */
+    function once(func) {
+      var ran,
+          result;
+
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      return function() {
+        if (ran) {
+          return result;
+        }
+        ran = true;
+        result = func.apply(this, arguments);
+
+        // clear the `func` variable so the function may be garbage collected
+        func = null;
+        return result;
+      };
+    }
+
+    /**
+     * Creates a function that, when called, invokes `func` with any additional
+     * `partial` arguments prepended to those provided to the new function. This
+     * method is similar to `_.bind` except it does **not** alter the `this` binding.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {...*} [arg] Arguments to be partially applied.
+     * @returns {Function} Returns the new partially applied function.
+     * @example
+     *
+     * var greet = function(greeting, name) { return greeting + ' ' + name; };
+     * var hi = _.partial(greet, 'hi');
+     * hi('fred');
+     * // => 'hi fred'
+     */
+    function partial(func) {
+      return createWrapper(func, 16, slice(arguments, 1));
+    }
+
+    /**
+     * This method is like `_.partial` except that `partial` arguments are
+     * appended to those provided to the new function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {...*} [arg] Arguments to be partially applied.
+     * @returns {Function} Returns the new partially applied function.
+     * @example
+     *
+     * var defaultsDeep = _.partialRight(_.merge, _.defaults);
+     *
+     * var options = {
+     *   'variable': 'data',
+     *   'imports': { 'jq': $ }
+     * };
+     *
+     * defaultsDeep(options, _.templateSettings);
+     *
+     * options.variable
+     * // => 'data'
+     *
+     * options.imports
+     * // => { '_': _, 'jq': $ }
+     */
+    function partialRight(func) {
+      return createWrapper(func, 32, null, slice(arguments, 1));
+    }
+
+    /**
+     * Creates a function that, when executed, will only call the `func` function
+     * at most once per every `wait` milliseconds. Provide an options object to
+     * indicate that `func` should be invoked on the leading and/or trailing edge
+     * of the `wait` timeout. Subsequent calls to the throttled function will
+     * return the result of the last `func` call.
+     *
+     * Note: If `leading` and `trailing` options are `true` `func` will be called
+     * on the trailing edge of the timeout only if the the throttled function is
+     * invoked more than once during the `wait` timeout.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {Function} func The function to throttle.
+     * @param {number} wait The number of milliseconds to throttle executions to.
+     * @param {Object} [options] The options object.
+     * @param {boolean} [options.leading=true] Specify execution on the leading edge of the timeout.
+     * @param {boolean} [options.trailing=true] Specify execution on the trailing edge of the timeout.
+     * @returns {Function} Returns the new throttled function.
+     * @example
+     *
+     * // avoid excessively updating the position while scrolling
+     * var throttled = _.throttle(updatePosition, 100);
+     * jQuery(window).on('scroll', throttled);
+     *
+     * // execute `renewToken` when the click event is fired, but not more than once every 5 minutes
+     * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
+     *   'trailing': false
+     * }));
+     */
+    function throttle(func, wait, options) {
+      var leading = true,
+          trailing = true;
+
+      if (!isFunction(func)) {
+        throw new TypeError;
+      }
+      if (options === false) {
+        leading = false;
+      } else if (isObject(options)) {
+        leading = 'leading' in options ? options.leading : leading;
+        trailing = 'trailing' in options ? options.trailing : trailing;
+      }
+      debounceOptions.leading = leading;
+      debounceOptions.maxWait = wait;
+      debounceOptions.trailing = trailing;
+
+      return debounce(func, wait, debounceOptions);
+    }
+
+    /**
+     * Creates a function that provides `value` to the wrapper function as its
+     * first argument. Additional arguments provided to the function are appended
+     * to those provided to the wrapper function. The wrapper is executed with
+     * the `this` binding of the created function.
+     *
+     * @static
+     * @memberOf _
+     * @category Functions
+     * @param {*} value The value to wrap.
+     * @param {Function} wrapper The wrapper function.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var p = _.wrap(_.escape, function(func, text) {
+     *   return '<p>' + func(text) + '</p>';
+     * });
+     *
+     * p('Fred, Wilma, & Pebbles');
+     * // => '<p>Fred, Wilma, &amp; Pebbles</p>'
+     */
+    function wrap(value, wrapper) {
+      return createWrapper(wrapper, 16, [value]);
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates a function that returns `value`.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {*} value The value to return from the new function.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var object = { 'name': 'fred' };
+     * var getter = _.constant(object);
+     * getter() === object;
+     * // => true
+     */
+    function constant(value) {
+      return function() {
+        return value;
+      };
+    }
+
+    /**
+     * Produces a callback bound to an optional `thisArg`. If `func` is a property
+     * name the created callback will return the property value for a given element.
+     * If `func` is an object the created callback will return `true` for elements
+     * that contain the equivalent object properties, otherwise it will return `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {*} [func=identity] The value to convert to a callback.
+     * @param {*} [thisArg] The `this` binding of the created callback.
+     * @param {number} [argCount] The number of arguments the callback accepts.
+     * @returns {Function} Returns a callback function.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * // wrap to create custom callback shorthands
+     * _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) {
+     *   var match = /^(.+?)__([gl]t)(.+)$/.exec(callback);
+     *   return !match ? func(callback, thisArg) : function(object) {
+     *     return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3];
+     *   };
+     * });
+     *
+     * _.filter(characters, 'age__gt38');
+     * // => [{ 'name': 'fred', 'age': 40 }]
+     */
+    function createCallback(func, thisArg, argCount) {
+      var type = typeof func;
+      if (func == null || type == 'function') {
+        return baseCreateCallback(func, thisArg, argCount);
+      }
+      // handle "_.pluck" style callback shorthands
+      if (type != 'object') {
+        return property(func);
+      }
+      var props = keys(func),
+          key = props[0],
+          a = func[key];
+
+      // handle "_.where" style callback shorthands
+      if (props.length == 1 && a === a && !isObject(a)) {
+        // fast path the common case of providing an object with a single
+        // property containing a primitive value
+        return function(object) {
+          var b = object[key];
+          return a === b && (a !== 0 || (1 / a == 1 / b));
+        };
+      }
+      return function(object) {
+        var length = props.length,
+            result = false;
+
+        while (length--) {
+          if (!(result = baseIsEqual(object[props[length]], func[props[length]], null, true))) {
+            break;
+          }
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their
+     * corresponding HTML entities.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} string The string to escape.
+     * @returns {string} Returns the escaped string.
+     * @example
+     *
+     * _.escape('Fred, Wilma, & Pebbles');
+     * // => 'Fred, Wilma, &amp; Pebbles'
+     */
+    function escape(string) {
+      return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar);
+    }
+
+    /**
+     * This method returns the first argument provided to it.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {*} value Any value.
+     * @returns {*} Returns `value`.
+     * @example
+     *
+     * var object = { 'name': 'fred' };
+     * _.identity(object) === object;
+     * // => true
+     */
+    function identity(value) {
+      return value;
+    }
+
+    /**
+     * Adds function properties of a source object to the destination object.
+     * If `object` is a function methods will be added to its prototype as well.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {Function|Object} [object=lodash] object The destination object.
+     * @param {Object} source The object of functions to add.
+     * @param {Object} [options] The options object.
+     * @param {boolean} [options.chain=true] Specify whether the functions added are chainable.
+     * @example
+     *
+     * function capitalize(string) {
+     *   return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
+     * }
+     *
+     * _.mixin({ 'capitalize': capitalize });
+     * _.capitalize('fred');
+     * // => 'Fred'
+     *
+     * _('fred').capitalize().value();
+     * // => 'Fred'
+     *
+     * _.mixin({ 'capitalize': capitalize }, { 'chain': false });
+     * _('fred').capitalize();
+     * // => 'Fred'
+     */
+    function mixin(object, source, options) {
+      var chain = true,
+          methodNames = source && functions(source);
+
+      if (!source || (!options && !methodNames.length)) {
+        if (options == null) {
+          options = source;
+        }
+        ctor = lodashWrapper;
+        source = object;
+        object = lodash;
+        methodNames = functions(source);
+      }
+      if (options === false) {
+        chain = false;
+      } else if (isObject(options) && 'chain' in options) {
+        chain = options.chain;
+      }
+      var ctor = object,
+          isFunc = isFunction(ctor);
+
+      forEach(methodNames, function(methodName) {
+        var func = object[methodName] = source[methodName];
+        if (isFunc) {
+          ctor.prototype[methodName] = function() {
+            var chainAll = this.__chain__,
+                value = this.__wrapped__,
+                args = [value];
+
+            push.apply(args, arguments);
+            var result = func.apply(object, args);
+            if (chain || chainAll) {
+              if (value === result && isObject(result)) {
+                return this;
+              }
+              result = new ctor(result);
+              result.__chain__ = chainAll;
+            }
+            return result;
+          };
+        }
+      });
+    }
+
+    /**
+     * Reverts the '_' variable to its previous value and returns a reference to
+     * the `lodash` function.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @returns {Function} Returns the `lodash` function.
+     * @example
+     *
+     * var lodash = _.noConflict();
+     */
+    function noConflict() {
+      context._ = oldDash;
+      return this;
+    }
+
+    /**
+     * A no-operation function.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @example
+     *
+     * var object = { 'name': 'fred' };
+     * _.noop(object) === undefined;
+     * // => true
+     */
+    function noop() {
+      // no operation performed
+    }
+
+    /**
+     * Gets the number of milliseconds that have elapsed since the Unix epoch
+     * (1 January 1970 00:00:00 UTC).
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @example
+     *
+     * var stamp = _.now();
+     * _.defer(function() { console.log(_.now() - stamp); });
+     * // => logs the number of milliseconds it took for the deferred function to be called
+     */
+    var now = isNative(now = Date.now) && now || function() {
+      return new Date().getTime();
+    };
+
+    /**
+     * Converts the given value into an integer of the specified radix.
+     * If `radix` is `undefined` or `0` a `radix` of `10` is used unless the
+     * `value` is a hexadecimal, in which case a `radix` of `16` is used.
+     *
+     * Note: This method avoids differences in native ES3 and ES5 `parseInt`
+     * implementations. See http://es5.github.io/#E.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} value The value to parse.
+     * @param {number} [radix] The radix used to interpret the value to parse.
+     * @returns {number} Returns the new integer value.
+     * @example
+     *
+     * _.parseInt('08');
+     * // => 8
+     */
+    var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) {
+      // Firefox < 21 and Opera < 15 follow the ES3 specified implementation of `parseInt`
+      return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0);
+    };
+
+    /**
+     * Creates a "_.pluck" style function, which returns the `key` value of a
+     * given object.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} key The name of the property to retrieve.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'fred',   'age': 40 },
+     *   { 'name': 'barney', 'age': 36 }
+     * ];
+     *
+     * var getName = _.property('name');
+     *
+     * _.map(characters, getName);
+     * // => ['barney', 'fred']
+     *
+     * _.sortBy(characters, getName);
+     * // => [{ 'name': 'barney', 'age': 36 }, { 'name': 'fred',   'age': 40 }]
+     */
+    function property(key) {
+      return function(object) {
+        return object[key];
+      };
+    }
+
+    /**
+     * Produces a random number between `min` and `max` (inclusive). If only one
+     * argument is provided a number between `0` and the given number will be
+     * returned. If `floating` is truey or either `min` or `max` are floats a
+     * floating-point number will be returned instead of an integer.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {number} [min=0] The minimum possible value.
+     * @param {number} [max=1] The maximum possible value.
+     * @param {boolean} [floating=false] Specify returning a floating-point number.
+     * @returns {number} Returns a random number.
+     * @example
+     *
+     * _.random(0, 5);
+     * // => an integer between 0 and 5
+     *
+     * _.random(5);
+     * // => also an integer between 0 and 5
+     *
+     * _.random(5, true);
+     * // => a floating-point number between 0 and 5
+     *
+     * _.random(1.2, 5.2);
+     * // => a floating-point number between 1.2 and 5.2
+     */
+    function random(min, max, floating) {
+      var noMin = min == null,
+          noMax = max == null;
+
+      if (floating == null) {
+        if (typeof min == 'boolean' && noMax) {
+          floating = min;
+          min = 1;
+        }
+        else if (!noMax && typeof max == 'boolean') {
+          floating = max;
+          noMax = true;
+        }
+      }
+      if (noMin && noMax) {
+        max = 1;
+      }
+      min = +min || 0;
+      if (noMax) {
+        max = min;
+        min = 0;
+      } else {
+        max = +max || 0;
+      }
+      if (floating || min % 1 || max % 1) {
+        var rand = nativeRandom();
+        return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1)))), max);
+      }
+      return baseRandom(min, max);
+    }
+
+    /**
+     * Resolves the value of property `key` on `object`. If `key` is a function
+     * it will be invoked with the `this` binding of `object` and its result returned,
+     * else the property value is returned. If `object` is falsey then `undefined`
+     * is returned.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {Object} object The object to inspect.
+     * @param {string} key The name of the property to resolve.
+     * @returns {*} Returns the resolved value.
+     * @example
+     *
+     * var object = {
+     *   'cheese': 'crumpets',
+     *   'stuff': function() {
+     *     return 'nonsense';
+     *   }
+     * };
+     *
+     * _.result(object, 'cheese');
+     * // => 'crumpets'
+     *
+     * _.result(object, 'stuff');
+     * // => 'nonsense'
+     */
+    function result(object, key) {
+      if (object) {
+        var value = object[key];
+        return isFunction(value) ? object[key]() : value;
+      }
+    }
+
+    /**
+     * A micro-templating method that handles arbitrary delimiters, preserves
+     * whitespace, and correctly escapes quotes within interpolated code.
+     *
+     * Note: In the development build, `_.template` utilizes sourceURLs for easier
+     * debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl
+     *
+     * For more information on precompiling templates see:
+     * http://lodash.com/custom-builds
+     *
+     * For more information on Chrome extension sandboxes see:
+     * http://developer.chrome.com/stable/extensions/sandboxingEval.html
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} text The template text.
+     * @param {Object} data The data object used to populate the text.
+     * @param {Object} [options] The options object.
+     * @param {RegExp} [options.escape] The "escape" delimiter.
+     * @param {RegExp} [options.evaluate] The "evaluate" delimiter.
+     * @param {Object} [options.imports] An object to import into the template as local variables.
+     * @param {RegExp} [options.interpolate] The "interpolate" delimiter.
+     * @param {string} [sourceURL] The sourceURL of the template's compiled source.
+     * @param {string} [variable] The data object variable name.
+     * @returns {Function|string} Returns a compiled function when no `data` object
+     *  is given, else it returns the interpolated text.
+     * @example
+     *
+     * // using the "interpolate" delimiter to create a compiled template
+     * var compiled = _.template('hello <%= name %>');
+     * compiled({ 'name': 'fred' });
+     * // => 'hello fred'
+     *
+     * // using the "escape" delimiter to escape HTML in data property values
+     * _.template('<b><%- value %></b>', { 'value': '<script>' });
+     * // => '<b>&lt;script&gt;</b>'
+     *
+     * // using the "evaluate" delimiter to generate HTML
+     * var list = '<% _.forEach(people, function(name) { %><li><%- name %></li><% }); %>';
+     * _.template(list, { 'people': ['fred', 'barney'] });
+     * // => '<li>fred</li><li>barney</li>'
+     *
+     * // using the ES6 delimiter as an alternative to the default "interpolate" delimiter
+     * _.template('hello ${ name }', { 'name': 'pebbles' });
+     * // => 'hello pebbles'
+     *
+     * // using the internal `print` function in "evaluate" delimiters
+     * _.template('<% print("hello " + name); %>!', { 'name': 'barney' });
+     * // => 'hello barney!'
+     *
+     * // using a custom template delimiters
+     * _.templateSettings = {
+     *   'interpolate': /{{([\s\S]+?)}}/g
+     * };
+     *
+     * _.template('hello {{ name }}!', { 'name': 'mustache' });
+     * // => 'hello mustache!'
+     *
+     * // using the `imports` option to import jQuery
+     * var list = '<% jq.each(people, function(name) { %><li><%- name %></li><% }); %>';
+     * _.template(list, { 'people': ['fred', 'barney'] }, { 'imports': { 'jq': jQuery } });
+     * // => '<li>fred</li><li>barney</li>'
+     *
+     * // using the `sourceURL` option to specify a custom sourceURL for the template
+     * var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' });
+     * compiled(data);
+     * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
+     *
+     * // using the `variable` option to ensure a with-statement isn't used in the compiled template
+     * var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' });
+     * compiled.source;
+     * // => function(data) {
+     *   var __t, __p = '', __e = _.escape;
+     *   __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!';
+     *   return __p;
+     * }
+     *
+     * // using the `source` property to inline compiled templates for meaningful
+     * // line numbers in error messages and a stack trace
+     * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
+     *   var JST = {\
+     *     "main": ' + _.template(mainText).source + '\
+     *   };\
+     * ');
+     */
+    function template(text, data, options) {
+      // based on John Resig's `tmpl` implementation
+      // http://ejohn.org/blog/javascript-micro-templating/
+      // and Laura Doktorova's doT.js
+      // https://github.com/olado/doT
+      var settings = lodash.templateSettings;
+      text = String(text || '');
+
+      // avoid missing dependencies when `iteratorTemplate` is not defined
+      options = defaults({}, options, settings);
+
+      var imports = defaults({}, options.imports, settings.imports),
+          importsKeys = keys(imports),
+          importsValues = values(imports);
+
+      var isEvaluating,
+          index = 0,
+          interpolate = options.interpolate || reNoMatch,
+          source = "__p += '";
+
+      // compile the regexp to match each delimiter
+      var reDelimiters = RegExp(
+        (options.escape || reNoMatch).source + '|' +
+        interpolate.source + '|' +
+        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
+        (options.evaluate || reNoMatch).source + '|$'
+      , 'g');
+
+      text.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
+        interpolateValue || (interpolateValue = esTemplateValue);
+
+        // escape characters that cannot be included in string literals
+        source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar);
+
+        // replace delimiters with snippets
+        if (escapeValue) {
+          source += "' +\n__e(" + escapeValue + ") +\n'";
+        }
+        if (evaluateValue) {
+          isEvaluating = true;
+          source += "';\n" + evaluateValue + ";\n__p += '";
+        }
+        if (interpolateValue) {
+          source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
+        }
+        index = offset + match.length;
+
+        // the JS engine embedded in Adobe products requires returning the `match`
+        // string in order to produce the correct `offset` value
+        return match;
+      });
+
+      source += "';\n";
+
+      // if `variable` is not specified, wrap a with-statement around the generated
+      // code to add the data object to the top of the scope chain
+      var variable = options.variable,
+          hasVariable = variable;
+
+      if (!hasVariable) {
+        variable = 'obj';
+        source = 'with (' + variable + ') {\n' + source + '\n}\n';
+      }
+      // cleanup code by stripping empty strings
+      source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
+        .replace(reEmptyStringMiddle, '$1')
+        .replace(reEmptyStringTrailing, '$1;');
+
+      // frame code as the function body
+      source = 'function(' + variable + ') {\n' +
+        (hasVariable ? '' : variable + ' || (' + variable + ' = {});\n') +
+        "var __t, __p = '', __e = _.escape" +
+        (isEvaluating
+          ? ', __j = Array.prototype.join;\n' +
+            "function print() { __p += __j.call(arguments, '') }\n"
+          : ';\n'
+        ) +
+        source +
+        'return __p\n}';
+
+      // Use a sourceURL for easier debugging.
+      // http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl
+      var sourceURL = '\n/*\n//# sourceURL=' + (options.sourceURL || '/lodash/template/source[' + (templateCounter++) + ']') + '\n*/';
+
+      try {
+        var result = Function(importsKeys, 'return ' + source + sourceURL).apply(undefined, importsValues);
+      } catch(e) {
+        e.source = source;
+        throw e;
+      }
+      if (data) {
+        return result(data);
+      }
+      // provide the compiled function's source by its `toString` method, in
+      // supported environments, or the `source` property as a convenience for
+      // inlining compiled templates during the build process
+      result.source = source;
+      return result;
+    }
+
+    /**
+     * Executes the callback `n` times, returning an array of the results
+     * of each callback execution. The callback is bound to `thisArg` and invoked
+     * with one argument; (index).
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {number} n The number of times to execute the callback.
+     * @param {Function} callback The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `callback`.
+     * @returns {Array} Returns an array of the results of each `callback` execution.
+     * @example
+     *
+     * var diceRolls = _.times(3, _.partial(_.random, 1, 6));
+     * // => [3, 6, 4]
+     *
+     * _.times(3, function(n) { mage.castSpell(n); });
+     * // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively
+     *
+     * _.times(3, function(n) { this.cast(n); }, mage);
+     * // => also calls `mage.castSpell(n)` three times
+     */
+    function times(n, callback, thisArg) {
+      n = (n = +n) > -1 ? n : 0;
+      var index = -1,
+          result = Array(n);
+
+      callback = baseCreateCallback(callback, thisArg, 1);
+      while (++index < n) {
+        result[index] = callback(index);
+      }
+      return result;
+    }
+
+    /**
+     * The inverse of `_.escape` this method converts the HTML entities
+     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to their
+     * corresponding characters.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} string The string to unescape.
+     * @returns {string} Returns the unescaped string.
+     * @example
+     *
+     * _.unescape('Fred, Barney &amp; Pebbles');
+     * // => 'Fred, Barney & Pebbles'
+     */
+    function unescape(string) {
+      return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar);
+    }
+
+    /**
+     * Generates a unique ID. If `prefix` is provided the ID will be appended to it.
+     *
+     * @static
+     * @memberOf _
+     * @category Utilities
+     * @param {string} [prefix] The value to prefix the ID with.
+     * @returns {string} Returns the unique ID.
+     * @example
+     *
+     * _.uniqueId('contact_');
+     * // => 'contact_104'
+     *
+     * _.uniqueId();
+     * // => '105'
+     */
+    function uniqueId(prefix) {
+      var id = ++idCounter;
+      return String(prefix == null ? '' : prefix) + id;
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * Creates a `lodash` object that wraps the given value with explicit
+     * method chaining enabled.
+     *
+     * @static
+     * @memberOf _
+     * @category Chaining
+     * @param {*} value The value to wrap.
+     * @returns {Object} Returns the wrapper object.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney',  'age': 36 },
+     *   { 'name': 'fred',    'age': 40 },
+     *   { 'name': 'pebbles', 'age': 1 }
+     * ];
+     *
+     * var youngest = _.chain(characters)
+     *     .sortBy('age')
+     *     .map(function(chr) { return chr.name + ' is ' + chr.age; })
+     *     .first()
+     *     .value();
+     * // => 'pebbles is 1'
+     */
+    function chain(value) {
+      value = new lodashWrapper(value);
+      value.__chain__ = true;
+      return value;
+    }
+
+    /**
+     * Invokes `interceptor` with the `value` as the first argument and then
+     * returns `value`. The purpose of this method is to "tap into" a method
+     * chain in order to perform operations on intermediate results within
+     * the chain.
+     *
+     * @static
+     * @memberOf _
+     * @category Chaining
+     * @param {*} value The value to provide to `interceptor`.
+     * @param {Function} interceptor The function to invoke.
+     * @returns {*} Returns `value`.
+     * @example
+     *
+     * _([1, 2, 3, 4])
+     *  .tap(function(array) { array.pop(); })
+     *  .reverse()
+     *  .value();
+     * // => [3, 2, 1]
+     */
+    function tap(value, interceptor) {
+      interceptor(value);
+      return value;
+    }
+
+    /**
+     * Enables explicit method chaining on the wrapper object.
+     *
+     * @name chain
+     * @memberOf _
+     * @category Chaining
+     * @returns {*} Returns the wrapper object.
+     * @example
+     *
+     * var characters = [
+     *   { 'name': 'barney', 'age': 36 },
+     *   { 'name': 'fred',   'age': 40 }
+     * ];
+     *
+     * // without explicit chaining
+     * _(characters).first();
+     * // => { 'name': 'barney', 'age': 36 }
+     *
+     * // with explicit chaining
+     * _(characters).chain()
+     *   .first()
+     *   .pick('age')
+     *   .value();
+     * // => { 'age': 36 }
+     */
+    function wrapperChain() {
+      this.__chain__ = true;
+      return this;
+    }
+
+    /**
+     * Produces the `toString` result of the wrapped value.
+     *
+     * @name toString
+     * @memberOf _
+     * @category Chaining
+     * @returns {string} Returns the string result.
+     * @example
+     *
+     * _([1, 2, 3]).toString();
+     * // => '1,2,3'
+     */
+    function wrapperToString() {
+      return String(this.__wrapped__);
+    }
+
+    /**
+     * Extracts the wrapped value.
+     *
+     * @name valueOf
+     * @memberOf _
+     * @alias value
+     * @category Chaining
+     * @returns {*} Returns the wrapped value.
+     * @example
+     *
+     * _([1, 2, 3]).valueOf();
+     * // => [1, 2, 3]
+     */
+    function wrapperValueOf() {
+      return this.__wrapped__;
+    }
+
+    /*--------------------------------------------------------------------------*/
+
+    // add functions that return wrapped values when chaining
+    lodash.after = after;
+    lodash.assign = assign;
+    lodash.at = at;
+    lodash.bind = bind;
+    lodash.bindAll = bindAll;
+    lodash.bindKey = bindKey;
+    lodash.chain = chain;
+    lodash.compact = compact;
+    lodash.compose = compose;
+    lodash.constant = constant;
+    lodash.countBy = countBy;
+    lodash.create = create;
+    lodash.createCallback = createCallback;
+    lodash.curry = curry;
+    lodash.debounce = debounce;
+    lodash.defaults = defaults;
+    lodash.defer = defer;
+    lodash.delay = delay;
+    lodash.difference = difference;
+    lodash.filter = filter;
+    lodash.flatten = flatten;
+    lodash.forEach = forEach;
+    lodash.forEachRight = forEachRight;
+    lodash.forIn = forIn;
+    lodash.forInRight = forInRight;
+    lodash.forOwn = forOwn;
+    lodash.forOwnRight = forOwnRight;
+    lodash.functions = functions;
+    lodash.groupBy = groupBy;
+    lodash.indexBy = indexBy;
+    lodash.initial = initial;
+    lodash.intersection = intersection;
+    lodash.invert = invert;
+    lodash.invoke = invoke;
+    lodash.keys = keys;
+    lodash.map = map;
+    lodash.mapValues = mapValues;
+    lodash.max = max;
+    lodash.memoize = memoize;
+    lodash.merge = merge;
+    lodash.min = min;
+    lodash.omit = omit;
+    lodash.once = once;
+    lodash.pairs = pairs;
+    lodash.partial = partial;
+    lodash.partialRight = partialRight;
+    lodash.pick = pick;
+    lodash.pluck = pluck;
+    lodash.property = property;
+    lodash.pull = pull;
+    lodash.range = range;
+    lodash.reject = reject;
+    lodash.remove = remove;
+    lodash.rest = rest;
+    lodash.shuffle = shuffle;
+    lodash.sortBy = sortBy;
+    lodash.tap = tap;
+    lodash.throttle = throttle;
+    lodash.times = times;
+    lodash.toArray = toArray;
+    lodash.transform = transform;
+    lodash.union = union;
+    lodash.uniq = uniq;
+    lodash.values = values;
+    lodash.where = where;
+    lodash.without = without;
+    lodash.wrap = wrap;
+    lodash.xor = xor;
+    lodash.zip = zip;
+    lodash.zipObject = zipObject;
+
+    // add aliases
+    lodash.collect = map;
+    lodash.drop = rest;
+    lodash.each = forEach;
+    lodash.eachRight = forEachRight;
+    lodash.extend = assign;
+    lodash.methods = functions;
+    lodash.object = zipObject;
+    lodash.select = filter;
+    lodash.tail = rest;
+    lodash.unique = uniq;
+    lodash.unzip = zip;
+
+    // add functions to `lodash.prototype`
+    mixin(lodash);
+
+    /*--------------------------------------------------------------------------*/
+
+    // add functions that return unwrapped values when chaining
+    lodash.clone = clone;
+    lodash.cloneDeep = cloneDeep;
+    lodash.contains = contains;
+    lodash.escape = escape;
+    lodash.every = every;
+    lodash.find = find;
+    lodash.findIndex = findIndex;
+    lodash.findKey = findKey;
+    lodash.findLast = findLast;
+    lodash.findLastIndex = findLastIndex;
+    lodash.findLastKey = findLastKey;
+    lodash.has = has;
+    lodash.identity = identity;
+    lodash.indexOf = indexOf;
+    lodash.isArguments = isArguments;
+    lodash.isArray = isArray;
+    lodash.isBoolean = isBoolean;
+    lodash.isDate = isDate;
+    lodash.isElement = isElement;
+    lodash.isEmpty = isEmpty;
+    lodash.isEqual = isEqual;
+    lodash.isFinite = isFinite;
+    lodash.isFunction = isFunction;
+    lodash.isNaN = isNaN;
+    lodash.isNull = isNull;
+    lodash.isNumber = isNumber;
+    lodash.isObject = isObject;
+    lodash.isPlainObject = isPlainObject;
+    lodash.isRegExp = isRegExp;
+    lodash.isString = isString;
+    lodash.isUndefined = isUndefined;
+    lodash.lastIndexOf = lastIndexOf;
+    lodash.mixin = mixin;
+    lodash.noConflict = noConflict;
+    lodash.noop = noop;
+    lodash.now = now;
+    lodash.parseInt = parseInt;
+    lodash.random = random;
+    lodash.reduce = reduce;
+    lodash.reduceRight = reduceRight;
+    lodash.result = result;
+    lodash.runInContext = runInContext;
+    lodash.size = size;
+    lodash.some = some;
+    lodash.sortedIndex = sortedIndex;
+    lodash.template = template;
+    lodash.unescape = unescape;
+    lodash.uniqueId = uniqueId;
+
+    // add aliases
+    lodash.all = every;
+    lodash.any = some;
+    lodash.detect = find;
+    lodash.findWhere = find;
+    lodash.foldl = reduce;
+    lodash.foldr = reduceRight;
+    lodash.include = contains;
+    lodash.inject = reduce;
+
+    mixin(function() {
+      var source = {}
+      forOwn(lodash, function(func, methodName) {
+        if (!lodash.prototype[methodName]) {
+          source[methodName] = func;
+        }
+      });
+      return source;
+    }(), false);
+
+    /*--------------------------------------------------------------------------*/
+
+    // add functions capable of returning wrapped and unwrapped values when chaining
+    lodash.first = first;
+    lodash.last = last;
+    lodash.sample = sample;
+
+    // add aliases
+    lodash.take = first;
+    lodash.head = first;
+
+    forOwn(lodash, function(func, methodName) {
+      var callbackable = methodName !== 'sample';
+      if (!lodash.prototype[methodName]) {
+        lodash.prototype[methodName]= function(n, guard) {
+          var chainAll = this.__chain__,
+              result = func(this.__wrapped__, n, guard);
+
+          return !chainAll && (n == null || (guard && !(callbackable && typeof n == 'function')))
+            ? result
+            : new lodashWrapper(result, chainAll);
+        };
+      }
+    });
+
+    /*--------------------------------------------------------------------------*/
+
+    /**
+     * The semantic version number.
+     *
+     * @static
+     * @memberOf _
+     * @type string
+     */
+    lodash.VERSION = '2.4.1';
+
+    // add "Chaining" functions to the wrapper
+    lodash.prototype.chain = wrapperChain;
+    lodash.prototype.toString = wrapperToString;
+    lodash.prototype.value = wrapperValueOf;
+    lodash.prototype.valueOf = wrapperValueOf;
+
+    // add `Array` functions that return unwrapped values
+    forEach(['join', 'pop', 'shift'], function(methodName) {
+      var func = arrayRef[methodName];
+      lodash.prototype[methodName] = function() {
+        var chainAll = this.__chain__,
+            result = func.apply(this.__wrapped__, arguments);
+
+        return chainAll
+          ? new lodashWrapper(result, chainAll)
+          : result;
+      };
+    });
+
+    // add `Array` functions that return the existing wrapped value
+    forEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) {
+      var func = arrayRef[methodName];
+      lodash.prototype[methodName] = function() {
+        func.apply(this.__wrapped__, arguments);
+        return this;
+      };
+    });
+
+    // add `Array` functions that return new wrapped values
+    forEach(['concat', 'slice', 'splice'], function(methodName) {
+      var func = arrayRef[methodName];
+      lodash.prototype[methodName] = function() {
+        return new lodashWrapper(func.apply(this.__wrapped__, arguments), this.__chain__);
+      };
+    });
+
+    return lodash;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  // expose Lo-Dash
+  var _ = runInContext();
+
+  // some AMD build optimizers like r.js check for condition patterns like the following:
+  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
+    // Expose Lo-Dash to the global object even when an AMD loader is present in
+    // case Lo-Dash is loaded with a RequireJS shim config.
+    // See http://requirejs.org/docs/api.html#config-shim
+    root._ = _;
+
+    // define as an anonymous module so, through path mapping, it can be
+    // referenced as the "underscore" module
+    define(function() {
+      return _;
+    });
+  }
+  // check for `exports` after `define` in case a build optimizer adds an `exports` object
+  else if (freeExports && freeModule) {
+    // in Node.js or RingoJS
+    if (moduleExports) {
+      (freeModule.exports = _)._ = _;
+    }
+    // in Narwhal or Rhino -require
+    else {
+      freeExports._ = _;
+    }
+  }
+  else {
+    // in a browser or Rhino
+    root._ = _;
+  }
+}.call(this));
diff --git a/packages/context-coloring/benchmark/fixtures/mkdirp-0.5.0.js b/packages/context-coloring/benchmark/fixtures/mkdirp-0.5.0.js
new file mode 100644
index 0000000..a1742b2
--- /dev/null
+++ b/packages/context-coloring/benchmark/fixtures/mkdirp-0.5.0.js
@@ -0,0 +1,97 @@
+var path = require('path');
+var fs = require('fs');
+
+module.exports = mkdirP.mkdirp = mkdirP.mkdirP = mkdirP;
+
+function mkdirP (p, opts, f, made) {
+    if (typeof opts === 'function') {
+        f = opts;
+        opts = {};
+    }
+    else if (!opts || typeof opts !== 'object') {
+        opts = { mode: opts };
+    }
+    
+    var mode = opts.mode;
+    var xfs = opts.fs || fs;
+    
+    if (mode === undefined) {
+        mode = 0777 & (~process.umask());
+    }
+    if (!made) made = null;
+    
+    var cb = f || function () {};
+    p = path.resolve(p);
+    
+    xfs.mkdir(p, mode, function (er) {
+        if (!er) {
+            made = made || p;
+            return cb(null, made);
+        }
+        switch (er.code) {
+            case 'ENOENT':
+                mkdirP(path.dirname(p), opts, function (er, made) {
+                    if (er) cb(er, made);
+                    else mkdirP(p, opts, cb, made);
+                });
+                break;
+
+            // In the case of any other error, just see if there's a dir
+            // there already.  If so, then hooray!  If not, then something
+            // is borked.
+            default:
+                xfs.stat(p, function (er2, stat) {
+                    // if the stat fails, then that's super weird.
+                    // let the original error be the failure reason.
+                    if (er2 || !stat.isDirectory()) cb(er, made)
+                    else cb(null, made);
+                });
+                break;
+        }
+    });
+}
+
+mkdirP.sync = function sync (p, opts, made) {
+    if (!opts || typeof opts !== 'object') {
+        opts = { mode: opts };
+    }
+    
+    var mode = opts.mode;
+    var xfs = opts.fs || fs;
+    
+    if (mode === undefined) {
+        mode = 0777 & (~process.umask());
+    }
+    if (!made) made = null;
+
+    p = path.resolve(p);
+
+    try {
+        xfs.mkdirSync(p, mode);
+        made = made || p;
+    }
+    catch (err0) {
+        switch (err0.code) {
+            case 'ENOENT' :
+                made = sync(path.dirname(p), opts, made);
+                sync(p, opts, made);
+                break;
+
+            // In the case of any other error, just see if there's a dir
+            // there already.  If so, then hooray!  If not, then something
+            // is borked.
+            default:
+                var stat;
+                try {
+                    stat = xfs.statSync(p);
+                }
+                catch (err1) {
+                    throw err0;
+                }
+                if (!stat.isDirectory()) throw err0;
+                break;
+        }
+    }
+
+    return made;
+};
diff --git a/packages/context-coloring/context-coloring-themes.el b/packages/context-coloring/context-coloring-themes.el
new file mode 100644
index 0000000..a964169
--- /dev/null
+++ b/packages/context-coloring/context-coloring-themes.el
@@ -0,0 +1,122 @@
+;;; context-coloring-themes.el --- Color schemes for Context Coloring. -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; An assortment of color schemes for Context Coloring, many of which are based
+;; on existing color themes and custom themes.
+
+;; To use, simply call `context-coloring-load-theme':
+
+;; (require 'context-coloring)
+;; (context-coloring-load-theme 'zenburn)
+
+;;; Code:
+
+(defvar context-coloring-theme-hash-table (make-hash-table :test 'eq)
+  "Mapping of theme names to theme properties.")
+
+(defun context-coloring-define-theme (theme &rest properties)
+  "Define a theme named THEME for coloring scope levels.
+PROPERTIES is a property list specifiying the following details:
+
+`:colors': List of colors that this theme uses."
+  (puthash
+   theme
+   (lambda ()
+     (apply 'context-coloring-set-colors (plist-get properties :colors)))
+   context-coloring-theme-hash-table))
+
+(defun context-coloring-load-theme (theme)
+  "Apply THEME's colors and other properties for context
+coloring."
+  (let ((function (gethash theme context-coloring-theme-hash-table)))
+    (when (null function)
+      (error (format "No such theme `%s'" theme)))
+    (funcall function)))
+
+(context-coloring-define-theme
+ 'monokai
+ :colors '("#F8F8F2"
+           "#66D9EF"
+           "#A1EFE4"
+           "#A6E22E"
+           "#E6DB74"
+           "#FD971F"
+           "#F92672"
+           "#FD5FF0"
+           "#AE81FF"))
+
+(context-coloring-define-theme
+ 'solarized
+ :colors '("#839496"
+           "#268bd2"
+           "#2aa198"
+           "#859900"
+           "#b58900"
+           "#cb4b16"
+           "#dc322f"
+           "#d33682"
+           "#6c71c4"
+           "#69B7F0"
+           "#69CABF"
+           "#B4C342"
+           "#DEB542"
+           "#F2804F"
+           "#FF6E64"
+           "#F771AC"
+           "#9EA0E5"))
+
+(context-coloring-define-theme
+ 'tango
+ :colors '("#2e3436"
+           "#346604"
+           "#204a87"
+           "#5c3566"
+           "#a40000"
+           "#b35000"
+           "#c4a000"
+           "#8ae234"
+           "#8cc4ff"
+           "#ad7fa8"
+           "#ef2929"
+           "#fcaf3e"
+           "#fce94f"))
+
+(context-coloring-define-theme
+ 'zenburn
+ :colors '("#DCDCCC"
+           "#93E0E3"
+           "#BFEBBF"
+           "#F0DFAF"
+           "#DFAF8F"
+           "#CC9393"
+           "#DC8CC3"
+           "#94BFF3"
+           "#9FC59F"
+           "#D0BF8F"
+           "#DCA3A3"))
+
+(provide 'context-coloring-themes)
+
+;; Local Variables:
+;; eval: (when (fboundp 'rainbow-mode) (rainbow-mode 1))
+;; End:
+
+;;; context-coloring-themes.el ends here
diff --git a/packages/context-coloring/context-coloring.el b/packages/context-coloring/context-coloring.el
new file mode 100644
index 0000000..cd5a8b4
--- /dev/null
+++ b/packages/context-coloring/context-coloring.el
@@ -0,0 +1,518 @@
+;;; context-coloring.el --- Syntax highlighting, except not for syntax. -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+;; Author: Jackson Ray Hamilton <address@hidden>
+;; URL: https://github.com/jacksonrayhamilton/context-coloring
+;; Keywords: context coloring syntax highlighting
+;; Version: 3.1.0
+;; Package-Requires: ((emacs "24") (js2-mode "20150126"))
+
+;; This file is part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Highlights code according to function context.
+
+;; - Code in the global scope is one color.  Code in functions within the global
+;;   scope is a different color, and code within such functions is another
+;;   color, and so on.
+;; - Identifiers retain the color of the scope in which they are declared.
+
+;; Lexical scope information at-a-glance can assist a programmer in
+;; understanding the overall structure of a program.  It can help to curb nasty
+;; bugs like name shadowing.  A rainbow can indicate excessive complexity. State
+;; change within a closure is easily monitored.
+
+;; By default, Context Coloring still highlights comments and strings
+;; syntactically.  It is still easy to differentiate code from non-code, and
+;; strings cannot be confused for variables.
+
+;; To use, add the following to your ~/.emacs:
+
+;; (require 'context-coloring)
+;; (add-hook 'js-mode-hook 'context-coloring-mode)
+
+;;; Code:
+
+(require 'context-coloring-themes)
+(require 'js2-mode)
+
+
+;;; Constants
+
+(defconst context-coloring-path
+  (file-name-directory (or load-file-name buffer-file-name))
+  "This file's directory.")
+
+
+;;; Customizable options
+
+(defcustom context-coloring-delay 0.25
+  "Delay between a buffer update and colorization.
+
+Increase this if your machine is high-performing.  Decrease it if
+it ain't.
+
+Supported modes: `js-mode', `js3-mode'"
+  :group 'context-coloring)
+
+(defcustom context-coloring-comments-and-strings t
+  "If non-nil, also color comments and strings using `font-lock'."
+  :group 'context-coloring)
+
+(defcustom context-coloring-js-block-scopes nil
+  "If non-nil, also color block scopes in the scope hierarchy in JavaScript.
+
+The block-scope-inducing `let' and `const' are introduced in ES6.
+If you are writing ES6 code, enable this; otherwise, don't.
+
+Supported modes: `js2-mode'"
+  :group 'context-coloring)
+
+(defcustom context-coloring-benchmark-colorization nil
+  "If non-nil, track how long colorization takes and print
+messages with the colorization duration."
+  :group 'context-coloring)
+
+
+;;; Local variables
+
+(defvar-local context-coloring-buffer nil
+  "Reference to this buffer (for timers).")
+
+(defvar-local context-coloring-scopifier-process nil
+  "Reference to the single scopifier process that can be
+  running.")
+
+(defvar-local context-coloring-colorize-idle-timer nil
+  "Reference to the currently-running idle timer.")
+
+(defvar-local context-coloring-changed nil
+  "Indication that the buffer has changed recently, which would
+imply that it should be colorized again by
+`context-coloring-colorize-idle-timer' if that timer is being
+used.")
+
+
+;;; Faces
+
+(defun context-coloring-defface (level tty light dark)
+  (let ((face (intern (format "context-coloring-level-%s-face" level)))
+        (doc (format "Context coloring face, level %s." level)))
+    (eval (macroexpand `(defface ,face
+                          '((((type tty)) (:foreground ,tty))
+                            (((background light)) (:foreground ,light))
+                            (((background dark)) (:foreground ,dark)))
+                          ,doc
+                          :group 'context-coloring)))))
+
+(defvar context-coloring-face-count nil
+  "Number of faces available for context coloring.")
+
+(defun context-coloring-defface-default (level)
+  (context-coloring-defface level "white" "#3f3f3f" "#cdcdcd"))
+
+(defun context-coloring-set-colors-default ()
+  (context-coloring-defface 0 "white"   "#000000" "#ffffff")
+  (context-coloring-defface 1 "yellow"  "#007f80" "#ffff80")
+  (context-coloring-defface 2 "green"   "#001580" "#cdfacd")
+  (context-coloring-defface 3 "cyan"    "#550080" "#d8d8ff")
+  (context-coloring-defface 4 "blue"    "#802b00" "#e7c7ff")
+  (context-coloring-defface 5 "magenta" "#6a8000" "#ffcdcd")
+  (context-coloring-defface 6 "red"     "#008000" "#ffe390")
+  (context-coloring-defface-default 7)
+  (setq context-coloring-face-count 8))
+
+(context-coloring-set-colors-default)
+
+
+;;; Face functions
+
+(defsubst context-coloring-face-symbol (level)
+  "Returns a symbol for a face with LEVEL."
+  ;; `concat' is faster than `format' here.
+  (intern-soft (concat "context-coloring-level-"
+                       (number-to-string level)
+                       "-face")))
+
+(defun context-coloring-set-colors (&rest colors)
+  "Set context coloring's levels' coloring to COLORS, where the
+Nth element of COLORS is level N's color."
+  (setq context-coloring-face-count (length colors))
+  (let ((level 0))
+    (dolist (color colors)
+      ;; Ensure there are available faces to contain new colors.
+      (when (not (context-coloring-face-symbol level))
+        (context-coloring-defface-default level))
+      (set-face-foreground (context-coloring-face-symbol level) color)
+      (setq level (+ level 1)))))
+
+(defsubst context-coloring-level-face (level)
+  "Returns the face name for LEVEL."
+  (context-coloring-face-symbol (min level context-coloring-face-count)))
+
+
+;;; Colorization utilities
+
+(defsubst context-coloring-colorize-region (start end level)
+  "Colorizes characters from the 1-indexed START (inclusive) to
+END (exclusive) with the face corresponding to LEVEL."
+  (add-text-properties
+   start
+   end
+   `(face ,(context-coloring-level-face level))))
+
+(defsubst context-coloring-maybe-colorize-comments-and-strings ()
+  "Colorizes the current buffer's comments and strings if
+`context-coloring-comments-and-strings' is non-nil."
+  (when context-coloring-comments-and-strings
+    (save-excursion
+      (font-lock-fontify-syntactically-region (point-min) (point-max)))))
+
+
+;;; js2-mode colorization
+
+(defvar-local context-coloring-js2-scope-level-hash-table nil
+  "Associates `js2-scope' structures and with their scope
+  levels.")
+
+(defsubst context-coloring-js2-scope-level (scope)
+  "Gets the level of SCOPE."
+  (cond ((gethash scope context-coloring-js2-scope-level-hash-table))
+        (t
+         (let ((level 0)
+               (current-scope scope)
+               enclosing-scope)
+           (while (and current-scope
+                       (js2-node-parent current-scope)
+                       (setq enclosing-scope
+                             (js2-node-get-enclosing-scope current-scope)))
+             (when (or context-coloring-js-block-scopes
+                       (let ((type (js2-scope-type current-scope)))
+                         (or (= type js2-SCRIPT)
+                             (= type js2-FUNCTION)
+                             (= type js2-CATCH))))
+               (setq level (+ level 1)))
+             (setq current-scope enclosing-scope))
+           (puthash scope level context-coloring-js2-scope-level-hash-table)))))
+
+(defsubst context-coloring-js2-local-name-node-p (node)
+  "Determines if NODE is a js2-name-node representing a local
+variable."
+  (and (js2-name-node-p node)
+       (let ((parent (js2-node-parent node)))
+         (not (or (and (js2-object-prop-node-p parent)
+                       (eq node (js2-object-prop-node-left parent)))
+                  (and (js2-prop-get-node-p parent)
+                       ;; For nested property lookup, the node on the left is a
+                       ;; `js2-prop-get-node', so this always works.
+                       (eq node (js2-prop-get-node-right parent))))))))
+
+(defsubst context-coloring-js2-colorize-node (node level)
+  "Colors NODE with the color for LEVEL."
+  (let ((start (js2-node-abs-pos node)))
+    (context-coloring-colorize-region
+     start
+     (+ start (js2-node-len node)) ; End
+     level)))
+
+(defun context-coloring-js2-colorize ()
+  "Colorizes the current buffer using the abstract syntax tree
+generated by js2-mode."
+  ;; Reset the hash table; the old one could be obsolete.
+  (setq context-coloring-js2-scope-level-hash-table (make-hash-table :test 'eq))
+  (with-silent-modifications
+    (js2-visit-ast
+     js2-mode-ast
+     (lambda (node end-p)
+       (when (null end-p)
+         (cond
+          ((js2-scope-p node)
+           (context-coloring-js2-colorize-node
+            node
+            (context-coloring-js2-scope-level node)))
+          ((context-coloring-js2-local-name-node-p node)
+           (let* ((enclosing-scope (js2-node-get-enclosing-scope node))
+                  (defining-scope (js2-get-defining-scope
+                                   enclosing-scope
+                                   (js2-name-node-name node))))
+             ;; The tree seems to be walked lexically, so an entire scope will
+             ;; be colored, including its name nodes, before they are
+             ;; reached. Coloring the nodes defined in that scope would be
+             ;; redundant, so don't do it.
+             (when (not (eq defining-scope enclosing-scope))
+               (context-coloring-js2-colorize-node
+                node
+                (context-coloring-js2-scope-level defining-scope))))))
+         ;; The `t' indicates to search children.
+         t)))
+    (context-coloring-maybe-colorize-comments-and-strings)))
+
+
+;;; Shell command scopification / colorization
+
+(defun context-coloring-apply-tokens (tokens)
+  "Processes a vector of TOKENS to apply context-based coloring
+to the current buffer.  Tokens are 3 integers: start, end, level.
+The vector is flat, with a new token occurring after every 3rd
+element."
+  (with-silent-modifications
+    (let ((i 0)
+          (len (length tokens)))
+      (while (< i len)
+        (context-coloring-colorize-region
+         (elt tokens i)
+         (elt tokens (+ i 1))
+         (elt tokens (+ i 2)))
+        (setq i (+ i 3))))
+    (context-coloring-maybe-colorize-comments-and-strings)))
+
+(defun context-coloring-parse-array (input)
+  "Specialized JSON parser for a flat array of numbers."
+  (vconcat (mapcar 'string-to-number (split-string (substring input 1 -1) ","))))
+
+(defun context-coloring-kill-scopifier ()
+  "Kills the currently-running scopifier process for this
+buffer."
+  (when (not (null context-coloring-scopifier-process))
+    (delete-process context-coloring-scopifier-process)
+    (setq context-coloring-scopifier-process nil)))
+
+(defun context-coloring-scopify-shell-command (command &optional callback)
+  "Invokes a scopifier with the current buffer's contents,
+reading the scopifier's response asynchronously and applying a
+parsed list of tokens to `context-coloring-apply-tokens'.
+
+Invokes CALLBACK when complete."
+
+  ;; Prior running tokenization is implicitly obsolete if this function is
+  ;; called.
+  (context-coloring-kill-scopifier)
+
+  ;; Start the process.
+  (setq context-coloring-scopifier-process
+        (start-process-shell-command "scopifier" nil command))
+
+  (let ((output "")
+        (buffer context-coloring-buffer))
+
+    ;; The process may produce output in multiple chunks. This filter
+    ;; accumulates the chunks into a message.
+    (set-process-filter
+     context-coloring-scopifier-process
+     (lambda (_process chunk)
+       (setq output (concat output chunk))))
+
+    ;; When the process's message is complete, this sentinel parses it as JSON
+    ;; and applies the tokens to the buffer.
+    (set-process-sentinel
+     context-coloring-scopifier-process
+     (lambda (_process event)
+       (when (equal "finished\n" event)
+         (let ((tokens (context-coloring-parse-array output)))
+           (with-current-buffer buffer
+             (context-coloring-apply-tokens tokens))
+           (setq context-coloring-scopifier-process nil)
+           (if callback (funcall callback)))))))
+
+  ;; Give the process its input so it can begin.
+  (process-send-region context-coloring-scopifier-process (point-min) (point-max))
+  (process-send-eof context-coloring-scopifier-process))
+
+
+;;; Dispatch
+
+(defvar context-coloring-dispatch-hash-table (make-hash-table :test 'eq)
+  "Mapping of dispatch strategy names to their corresponding
+  property lists, which contain details about the strategies.")
+
+(defvar context-coloring-mode-hash-table (make-hash-table :test 'eq)
+  "Mapping of major mode names to dispatch property lists.")
+
+(defun context-coloring-select-dispatch (mode dispatch)
+  "Use DISPATCH for MODE."
+  (puthash
+   mode
+   (gethash
+    dispatch
+    context-coloring-dispatch-hash-table)
+   context-coloring-mode-hash-table))
+
+(defun context-coloring-define-dispatch (symbol &rest properties)
+  "Define a new dispatch named SYMBOL with PROPERTIES.
+
+A \"dispatch\" is a property list describing a strategy for
+coloring a buffer. There are three possible strategies: Parse and
+color in a single function (`:colorizer'), parse in a function
+that returns scope data (`:scopifier'), or parse with a shell
+command that returns scope data (`:command'). In the latter two
+cases, the scope data will be used to automatically color the
+buffer.
+
+PROPERTIES must include `:modes' and one of `:colorizer',
+`:scopifier' or `:command'.
+
+`:modes' - List of major modes this dispatch is valid for.
+
+`:colorizer' - Symbol referring to a function that parses and
+colors the buffer.
+
+`:scopifier' - Symbol referring to a function that parses the
+buffer a returns a flat vector of start, end and level data.
+
+`:executable' - Optional name of an executable required by
+`:command'.
+
+`:command' - Shell command to execute with the current buffer
+sent via stdin, and with a flat JSON array of start, end and
+level data returned via stdout."
+  (let ((modes (plist-get properties :modes))
+        (colorizer (plist-get properties :colorizer))
+        (scopifier (plist-get properties :scopifier))
+        (command (plist-get properties :command)))
+    (when (null modes)
+      (error "No mode defined for dispatch"))
+    (when (not (or colorizer
+                   scopifier
+                   command))
+      (error "No colorizer, scopifier or command defined for dispatch"))
+    (puthash symbol properties context-coloring-dispatch-hash-table)
+    (dolist (mode modes)
+      (when (null (gethash mode context-coloring-mode-hash-table))
+        (puthash mode properties context-coloring-mode-hash-table)))))
+
+(context-coloring-define-dispatch
+ 'javascript-node
+ :modes '(js-mode js3-mode)
+ :executable "node"
+ :command (expand-file-name
+           "./languages/javascript/binaries/scopifier"
+           context-coloring-path))
+
+(context-coloring-define-dispatch
+ 'javascript-js2
+ :modes '(js2-mode)
+ :colorizer 'context-coloring-js2-colorize)
+
+(defun context-coloring-dispatch (&optional callback)
+  "Determines the optimal track for scopification / colorization
+of the current buffer, then executes it.
+
+Invokes CALLBACK when complete. It is invoked synchronously for
+elisp tracks, and asynchronously for shell command tracks."
+  (let ((dispatch (gethash major-mode context-coloring-mode-hash-table)))
+    (if (null dispatch)
+        (message "%s" "Context coloring is not available for this major mode"))
+    (let (colorizer
+          scopifier
+          command
+          executable)
+      (cond
+       ((setq colorizer (plist-get dispatch :colorizer))
+        (funcall colorizer)
+        (if callback (funcall callback)))
+       ((setq scopifier (plist-get dispatch :scopifier))
+        (context-coloring-apply-tokens (funcall scopifier))
+        (if callback (funcall callback)))
+       ((setq command (plist-get dispatch :command))
+        (setq executable (plist-get dispatch :executable))
+        (if (and (not (null executable))
+                 (null (executable-find executable)))
+            (message "Executable \"%s\" not found" executable)
+          (context-coloring-scopify-shell-command command callback)))))))
+
+
+;;; Colorization
+
+(defun context-coloring-colorize (&optional callback)
+  "Colors the current buffer by function context.
+
+Invokes CALLBACK when complete; see `context-coloring-dispatch'."
+  (interactive)
+  (let ((start-time (float-time)))
+    (context-coloring-dispatch
+     (lambda ()
+       (when context-coloring-benchmark-colorization
+         (message "Colorization took %.3f seconds" (- (float-time) start-time)))
+       (if callback (funcall callback))))))
+
+(defun context-coloring-change-function (_start _end _length)
+  "Registers a change so that a buffer can be colorized soon."
+  ;; Tokenization is obsolete if there was a change.
+  (context-coloring-kill-scopifier)
+  (setq context-coloring-changed t))
+
+(defun context-coloring-maybe-colorize ()
+  "Colorize unders certain conditions.  This will run as an idle
+timer, so firstly the buffer must not be some other buffer.
+Additionally, the buffer must have changed, otherwise colorizing
+would be redundant."
+  (when (and (eq context-coloring-buffer (window-buffer (selected-window)))
+             context-coloring-changed)
+    (setq context-coloring-changed nil)
+    (context-coloring-colorize)))
+
+
+;;; Minor mode
+
+;;;###autoload
+(define-minor-mode context-coloring-mode
+  "Context-based code coloring, inspired by Douglas Crockford."
+  nil " Context" nil
+  (if (not context-coloring-mode)
+      (progn
+        (context-coloring-kill-scopifier)
+        (when context-coloring-colorize-idle-timer
+          (cancel-timer context-coloring-colorize-idle-timer))
+        (remove-hook 'js2-post-parse-callbacks 'context-coloring-colorize t)
+        (remove-hook 'after-change-functions 'context-coloring-change-function t)
+        (font-lock-mode)
+        (jit-lock-mode t))
+
+    ;; Remember this buffer. This value should not be dynamically-bound.
+    (setq context-coloring-buffer (current-buffer))
+
+    ;; Font lock is incompatible with this mode; the converse is also true.
+    (font-lock-mode 0)
+    (jit-lock-mode nil)
+
+    ;; Colorize once initially.
+    (context-coloring-colorize)
+
+    (cond
+     ((equal major-mode 'js2-mode)
+      ;; Only recolor on reparse.
+      (add-hook 'js2-post-parse-callbacks 'context-coloring-colorize nil t))
+     (t
+      ;; Only recolor on change.
+      (add-hook 'after-change-functions 'context-coloring-change-function nil t)))
+
+    (when (not (equal major-mode 'js2-mode))
+      ;; Only recolor idly.
+      (setq context-coloring-colorize-idle-timer
+            (run-with-idle-timer
+             context-coloring-delay
+             t
+             'context-coloring-maybe-colorize)))))
+
+(provide 'context-coloring)
+
+;; Local Variables:
+;; eval: (when (fboundp 'rainbow-mode) (rainbow-mode 1))
+;; End:
+
+;;; context-coloring.el ends here
diff --git a/packages/context-coloring/languages/javascript/.jshintrc b/packages/context-coloring/languages/javascript/.jshintrc
new file mode 100644
index 0000000..82211c2
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/.jshintrc
@@ -0,0 +1,24 @@
+{
+  "bitwise": true,
+  "camelcase": true,
+  "curly": true,
+  "devel": true,
+  "eqeqeq": true,
+  "forin": true,
+  "freeze": true,
+  "funcscope": true,
+  "immed": true,
+  "indent": 4,
+  "latedef": true,
+  "newcap": true,
+  "noarg": true,
+  "node": true,
+  "noempty": true,
+  "nonbsp": true,
+  "nonew": true,
+  "plusplus": true,
+  "quotmark": "single",
+  "strict": true,
+  "undef": true,
+  "unused": "strict"
+}
diff --git a/packages/context-coloring/languages/javascript/binaries/scopifier b/packages/context-coloring/languages/javascript/binaries/scopifier
new file mode 100755
index 0000000..82ea34e
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/binaries/scopifier
@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+
+// Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+// This file is part of GNU Emacs.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+'use strict';
+
+var scopifier = require('../scopifier'),
+    whole = '';
+
+process.stdin.setEncoding('utf8');
+
+process.stdin.on('readable', function () {
+    var chunk = process.stdin.read();
+    if (chunk !== null) {
+        whole += chunk;
+    }
+});
+
+process.stdin.on('end', function () {
+    console.log(JSON.stringify(scopifier(whole)));
+});
diff --git a/packages/context-coloring/languages/javascript/libraries/escope.js b/packages/context-coloring/languages/javascript/libraries/escope.js
new file mode 100644
index 0000000..b42783c
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/libraries/escope.js
@@ -0,0 +1,1117 @@
+/*
+  Copyright (C) 2012-2013 Yusuke Suzuki <address@hidden>
+  Copyright (C) 2013 Alex Seville <address@hidden>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ * Escope (<a href="http://github.com/Constellation/escope">escope</a>) is an <a
+ * href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript</a>
+ * scope analyzer extracted from the <a
+ * href="http://github.com/Constellation/esmangle">esmangle project</a/>.
+ * <p>
+ * <em>escope</em> finds lexical scopes in a source program, i.e. areas of that
+ * program where different occurrences of the same identifier refer to the same
+ * variable. With each scope the contained variables are collected, and each
+ * identifier reference in code is linked to its corresponding variable (if
+ * possible).
+ * <p>
+ * <em>escope</em> works on a syntax tree of the parsed source code which has
+ * to adhere to the <a
+ * href="https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API">
+ * Mozilla Parser API</a>. E.g. <a href="http://esprima.org">esprima</a> is a parser
+ * that produces such syntax trees.
+ * <p>
+ * The main interface is the address@hidden analyze} function.
+ * @module
+ */
+
+/*jslint bitwise:true */
+/*global exports:true, define:true, require:true*/
+(function (factory, global) {
+    'use strict';
+
+    function namespace(str, obj) {
+        var i, iz, names, name;
+        names = str.split('.');
+        for (i = 0, iz = names.length; i < iz; ++i) {
+            name = names[i];
+            if (obj.hasOwnProperty(name)) {
+                obj = obj[name];
+            } else {
+                obj = (obj[name] = {});
+            }
+        }
+        return obj;
+    }
+
+    // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
+    // and plain browser loading,
+    if (typeof define === 'function' && define.amd) {
+        define('escope', ['exports', 'estraverse'], function (exports, estraverse) {
+            factory(exports, global, estraverse);
+        });
+    } else if (typeof exports !== 'undefined') {
+        factory(exports, global, require('./estraverse'));
+    } else {
+        factory(namespace('escope', global), global, global.estraverse);
+    }
+}(function (exports, global, estraverse) {
+    'use strict';
+
+    var Syntax,
+        Map,
+        currentScope,
+        globalScope,
+        scopes,
+        options;
+
+    Syntax = estraverse.Syntax;
+
+    if (typeof global.Map !== 'undefined') {
+        // ES6 Map
+        Map = global.Map;
+    } else {
+        Map = function Map() {
+            this.__data = {};
+        };
+
+        Map.prototype.get = function MapGet(key) {
+            key = '$' + key;
+            if (this.__data.hasOwnProperty(key)) {
+                return this.__data[key];
+            }
+            return undefined;
+        };
+
+        Map.prototype.has = function MapHas(key) {
+            key = '$' + key;
+            return this.__data.hasOwnProperty(key);
+        };
+
+        Map.prototype.set = function MapSet(key, val) {
+            key = '$' + key;
+            this.__data[key] = val;
+        };
+
+        Map.prototype['delete'] = function MapDelete(key) {
+            key = '$' + key;
+            return delete this.__data[key];
+        };
+    }
+
+    function assert(cond, text) {
+        if (!cond) {
+            throw new Error(text);
+        }
+    }
+
+    function defaultOptions() {
+        return {
+            optimistic: false,
+            directive: false
+        };
+    }
+
+    function updateDeeply(target, override) {
+        var key, val;
+
+        function isHashObject(target) {
+            return typeof target === 'object' && target instanceof Object && !(target instanceof RegExp);
+        }
+
+        for (key in override) {
+            if (override.hasOwnProperty(key)) {
+                val = override[key];
+                if (isHashObject(val)) {
+                    if (isHashObject(target[key])) {
+                        updateDeeply(target[key], val);
+                    } else {
+                        target[key] = updateDeeply({}, val);
+                    }
+                } else {
+                    target[key] = val;
+                }
+            }
+        }
+        return target;
+    }
+
+    /**
+     * A Reference represents a single occurrence of an identifier in code.
+     * @class Reference
+     */
+    function Reference(ident, scope, flag, writeExpr, maybeImplicitGlobal) {
+        /**
+         * Identifier syntax node.
+         * @member {esprima#Identifier} Reference#identifier
+         */
+        this.identifier = ident;
+        /**
+         * Reference to the enclosing Scope.
+         * @member {Scope} Reference#from
+         */
+        this.from = scope;
+        /**
+         * Whether the reference comes from a dynamic scope (such as 'eval',
+         * 'with', etc.), and may be trapped by dynamic scopes.
+         * @member {boolean} Reference#tainted
+         */
+        this.tainted = false;
+        /**
+         * The variable this reference is resolved with.
+         * @member {Variable} Reference#resolved
+         */
+        this.resolved = null;
+        /**
+         * The read-write mode of the reference. (Value is one of address@hidden
+         * Reference.READ}, address@hidden Reference.RW}, address@hidden Reference.WRITE}).
+         * @member {number} Reference#flag
+         * @private
+         */
+        this.flag = flag;
+        if (this.isWrite()) {
+            /**
+             * If reference is writeable, this is the tree being written to it.
+             * @member {esprima#Node} Reference#writeExpr
+             */
+            this.writeExpr = writeExpr;
+        }
+        /**
+         * Whether the Reference might refer to a global variable.
+         * @member {boolean} Reference#__maybeImplicitGlobal
+         * @private
+         */
+        this.__maybeImplicitGlobal = maybeImplicitGlobal;
+    }
+
+    /**
+     * @constant Reference.READ
+     * @private
+     */
+    Reference.READ = 0x1;
+    /**
+     * @constant Reference.WRITE
+     * @private
+     */
+    Reference.WRITE = 0x2;
+    /**
+     * @constant Reference.RW
+     * @private
+     */
+    Reference.RW = 0x3;
+
+    /**
+     * Whether the reference is static.
+     * @method Reference#isStatic
+     * @return {boolean}
+     */
+    Reference.prototype.isStatic = function isStatic() {
+        return !this.tainted && this.resolved && this.resolved.scope.isStatic();
+    };
+
+    /**
+     * Whether the reference is writeable.
+     * @method Reference#isWrite
+     * @return {boolean}
+     */
+    Reference.prototype.isWrite = function isWrite() {
+        return this.flag & Reference.WRITE;
+    };
+
+    /**
+     * Whether the reference is readable.
+     * @method Reference#isRead
+     * @return {boolean}
+     */
+    Reference.prototype.isRead = function isRead() {
+        return this.flag & Reference.READ;
+    };
+
+    /**
+     * Whether the reference is read-only.
+     * @method Reference#isReadOnly
+     * @return {boolean}
+     */
+    Reference.prototype.isReadOnly = function isReadOnly() {
+        return this.flag === Reference.READ;
+    };
+
+    /**
+     * Whether the reference is write-only.
+     * @method Reference#isWriteOnly
+     * @return {boolean}
+     */
+    Reference.prototype.isWriteOnly = function isWriteOnly() {
+        return this.flag === Reference.WRITE;
+    };
+
+    /**
+     * Whether the reference is read-write.
+     * @method Reference#isReadWrite
+     * @return {boolean}
+     */
+    Reference.prototype.isReadWrite = function isReadWrite() {
+        return this.flag === Reference.RW;
+    };
+
+    /**
+     * A Variable represents a locally scoped identifier. These include arguments to
+     * functions.
+     * @class Variable
+     */
+    function Variable(name, scope) {
+        /**
+         * The variable name, as given in the source code.
+         * @member {String} Variable#name
+         */
+        this.name = name;
+        /**
+         * List of defining occurrences of this variable (like in 'var ...'
+         * statements or as parameter), as AST nodes.
+         * @member {esprima.Identifier[]} Variable#identifiers
+         */
+        this.identifiers = [];
+        /**
+         * List of address@hidden Reference|references} of this variable (excluding parameter entries)
+         * in its defining scope and all nested scopes. For defining
+         * occurrences only see address@hidden Variable#defs}.
+         * @member {Reference[]} Variable#references
+         */
+        this.references = [];
+
+        /**
+         * List of defining occurrences of this variable (like in 'var ...'
+         * statements or as parameter), as custom objects.
+         * @typedef {Object} DefEntry
+         * @property {String} DefEntry.type - the type of the occurrence (e.g.
+         *      "Parameter", "Variable", ...)
+         * @property {esprima.Identifier} DefEntry.name - the identifier AST node of the occurrence
+         * @property {esprima.Node} DefEntry.node - the enclosing node of the
+         *      identifier
+         * @property {esprima.Node} [DefEntry.parent] - the enclosing statement
+         *      node of the identifier
+         * @member {DefEntry[]} Variable#defs
+         */
+        this.defs = [];
+
+        this.tainted = false;
+        /**
+         * Whether this is a stack variable.
+         * @member {boolean} Variable#stack
+         */
+        this.stack = true;
+        /**
+         * Reference to the enclosing Scope.
+         * @member {Scope} Variable#scope
+         */
+        this.scope = scope;
+    }
+
+    Variable.CatchClause = 'CatchClause';
+    Variable.Parameter = 'Parameter';
+    Variable.FunctionName = 'FunctionName';
+    Variable.Variable = 'Variable';
+    Variable.ImplicitGlobalVariable = 'ImplicitGlobalVariable';
+
+    function isStrictScope(scope, block) {
+        var body, i, iz, stmt, expr;
+
+        // When upper scope is exists and strict, inner scope is also strict.
+        if (scope.upper && scope.upper.isStrict) {
+            return true;
+        }
+
+        if (scope.type === 'function') {
+            body = block.body;
+        } else if (scope.type === 'global') {
+            body = block;
+        } else {
+            return false;
+        }
+
+        if (options.directive) {
+            for (i = 0, iz = body.body.length; i < iz; ++i) {
+                stmt = body.body[i];
+                if (stmt.type !== 'DirectiveStatement') {
+                    break;
+                }
+                if (stmt.raw === '"use strict"' || stmt.raw === '\'use strict\'') {
+                    return true;
+                }
+            }
+        } else {
+            for (i = 0, iz = body.body.length; i < iz; ++i) {
+                stmt = body.body[i];
+                if (stmt.type !== Syntax.ExpressionStatement) {
+                    break;
+                }
+                expr = stmt.expression;
+                if (expr.type !== Syntax.Literal || typeof expr.value !== 'string') {
+                    break;
+                }
+                if (expr.raw != null) {
+                    if (expr.raw === '"use strict"' || expr.raw === '\'use strict\'') {
+                        return true;
+                    }
+                } else {
+                    if (expr.value === 'use strict') {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * @class Scope
+     */
+    function Scope(block, opt) {
+        var variable, body;
+
+        /**
+         * One of 'catch', 'with', 'function' or 'global'.
+         * @member {String} Scope#type
+         */
+        this.type =
+            (block.type === Syntax.CatchClause) ? 'catch' :
+            (block.type === Syntax.WithStatement) ? 'with' :
+            (block.type === Syntax.Program) ? 'global' : 'function';
+         /**
+         * The scoped address@hidden Variable}s of this scope, as <code>{ Variable.name
+         * : Variable }</code>.
+         * @member {Map} Scope#set
+         */
+        this.set = new Map();
+        /**
+         * The tainted variables of this scope, as <code>{ Variable.name :
+         * boolean }</code>.
+         * @member {Map} Scope#taints */
+        this.taints = new Map();
+        /**
+         * Generally, through the lexical scoping of JS you can always know
+         * which variable an identifier in the source code refers to. There are
+         * a few exceptions to this rule. With 'global' and 'with' scopes you
+         * can only decide at runtime which variable a reference refers to.
+         * Moreover, if 'eval()' is used in a scope, it might introduce new
+         * bindings in this or its prarent scopes.
+         * All those scopes are considered 'dynamic'.
+         * @member {boolean} Scope#dynamic
+         */
+        this.dynamic = this.type === 'global' || this.type === 'with';
+        /**
+         * A reference to the scope-defining syntax node.
+         * @member {esprima.Node} Scope#block
+         */
+        this.block = block;
+         /**
+         * The address@hidden Reference|references} that are not resolved with this scope.
+         * @member {Reference[]} Scope#through
+         */
+        this.through = [];
+         /**
+         * The scoped address@hidden Variable}s of this scope. In the case of a
+         * 'function' scope this includes the automatic argument <em>arguments</em> as
+         * its first element, as well as all further formal arguments.
+         * @member {Variable[]} Scope#variables
+         */
+        this.variables = [];
+         /**
+         * Any variable address@hidden Reference|reference} found in this scope. This
+         * includes occurrences of local variables as well as variables from
+         * parent scopes (including the global scope). For local variables
+         * this also includes defining occurrences (like in a 'var' statement).
+         * In a 'function' scope this does not include the occurrences of the
+         * formal parameter in the parameter list.
+         * @member {Reference[]} Scope#references
+         */
+        this.references = [];
+         /**
+         * List of address@hidden Reference}s that are left to be resolved (i.e. which
+         * need to be linked to the variable they refer to). Used internally to
+         * resolve bindings during scope analysis. On a finalized scope
+         * analysis, all sopes have <em>left</em> value <strong>null</strong>.
+         * @member {Reference[]} Scope#left
+         */
+        this.left = [];
+         /**
+         * For 'global' and 'function' scopes, this is a self-reference. For
+         * other scope types this is the <em>variableScope</em> value of the
+         * parent scope.
+         * @member {Scope} Scope#variableScope
+         */
+        this.variableScope =
+            (this.type === 'global' || this.type === 'function') ? this : currentScope.variableScope;
+         /**
+         * Whether this scope is created by a FunctionExpression.
+         * @member {boolean} Scope#functionExpressionScope
+         */
+        this.functionExpressionScope = false;
+         /**
+         * Whether this is a scope that contains an 'eval()' invocation.
+         * @member {boolean} Scope#directCallToEvalScope
+         */
+        this.directCallToEvalScope = false;
+         /**
+         * @member {boolean} Scope#thisFound
+         */
+        this.thisFound = false;
+        body = this.type === 'function' ? block.body : block;
+        if (opt.naming) {
+            this.__define(block.id, {
+                type: Variable.FunctionName,
+                name: block.id,
+                node: block
+            });
+            this.functionExpressionScope = true;
+        } else {
+            if (this.type === 'function') {
+                variable = new Variable('arguments', this);
+                this.taints.set('arguments', true);
+                this.set.set('arguments', variable);
+                this.variables.push(variable);
+            }
+
+            if (block.type === Syntax.FunctionExpression && block.id) {
+                new Scope(block, { naming: true });
+            }
+        }
+
+         /**
+         * Reference to the parent address@hidden Scope|scope}.
+         * @member {Scope} Scope#upper
+         */
+        this.upper = currentScope;
+         /**
+         * Whether 'use strict' is in effect in this scope.
+         * @member {boolean} Scope#isStrict
+         */
+        this.isStrict = isStrictScope(this, block);
+
+         /**
+         * List of nested address@hidden Scope}s.
+         * @member {Scope[]} Scope#childScopes
+         */
+        this.childScopes = [];
+        if (currentScope) {
+            currentScope.childScopes.push(this);
+        }
+
+
+        // RAII
+        currentScope = this;
+        if (this.type === 'global') {
+            globalScope = this;
+            globalScope.implicit = {
+                set: new Map(),
+                variables: []
+            };
+        }
+        scopes.push(this);
+    }
+
+    Scope.prototype.__close = function __close() {
+        var i, iz, ref, current, node, implicit;
+
+        // Because if this is global environment, upper is null
+        if (!this.dynamic || options.optimistic) {
+            // static resolve
+            for (i = 0, iz = this.left.length; i < iz; ++i) {
+                ref = this.left[i];
+                if (!this.__resolve(ref)) {
+                    this.__delegateToUpperScope(ref);
+                }
+            }
+        } else {
+            // this is "global" / "with" / "function with eval" environment
+            if (this.type === 'with') {
+                for (i = 0, iz = this.left.length; i < iz; ++i) {
+                    ref = this.left[i];
+                    ref.tainted = true;
+                    this.__delegateToUpperScope(ref);
+                }
+            } else {
+                for (i = 0, iz = this.left.length; i < iz; ++i) {
+                    // notify all names are through to global
+                    ref = this.left[i];
+                    current = this;
+                    do {
+                        current.through.push(ref);
+                        current = current.upper;
+                    } while (current);
+                }
+            }
+        }
+
+        if (this.type === 'global') {
+            implicit = [];
+            for (i = 0, iz = this.left.length; i < iz; ++i) {
+                ref = this.left[i];
+                if (ref.__maybeImplicitGlobal && !this.set.has(ref.identifier.name)) {
+                    implicit.push(ref.__maybeImplicitGlobal);
+                }
+            }
+
+            // create an implicit global variable from assignment expression
+            for (i = 0, iz = implicit.length; i < iz; ++i) {
+                node = implicit[i];
+                this.__defineImplicit(node.left, {
+                    type: Variable.ImplicitGlobalVariable,
+                    name: node.left,
+                    node: node
+                });
+            }
+        }
+
+        this.left = null;
+        currentScope = this.upper;
+    };
+
+    Scope.prototype.__resolve = function __resolve(ref) {
+        var variable, name;
+        name = ref.identifier.name;
+        if (this.set.has(name)) {
+            variable = this.set.get(name);
+            variable.references.push(ref);
+            variable.stack = variable.stack && ref.from.variableScope === this.variableScope;
+            if (ref.tainted) {
+                variable.tainted = true;
+                this.taints.set(variable.name, true);
+            }
+            ref.resolved = variable;
+            return true;
+        }
+        return false;
+    };
+
+    Scope.prototype.__delegateToUpperScope = function __delegateToUpperScope(ref) {
+        if (this.upper) {
+            this.upper.left.push(ref);
+        }
+        this.through.push(ref);
+    };
+
+    Scope.prototype.__defineImplicit = function __defineImplicit(node, info) {
+        var name, variable;
+        if (node && node.type === Syntax.Identifier) {
+            name = node.name;
+            if (!this.implicit.set.has(name)) {
+                variable = new Variable(name, this);
+                variable.identifiers.push(node);
+                variable.defs.push(info);
+                this.implicit.set.set(name, variable);
+                this.implicit.variables.push(variable);
+            } else {
+                variable = this.implicit.set.get(name);
+                variable.identifiers.push(node);
+                variable.defs.push(info);
+            }
+        }
+    };
+
+    Scope.prototype.__define = function __define(node, info) {
+        var name, variable;
+        if (node && node.type === Syntax.Identifier) {
+            name = node.name;
+            if (!this.set.has(name)) {
+                variable = new Variable(name, this);
+                variable.identifiers.push(node);
+                variable.defs.push(info);
+                this.set.set(name, variable);
+                this.variables.push(variable);
+            } else {
+                variable = this.set.get(name);
+                variable.identifiers.push(node);
+                variable.defs.push(info);
+            }
+        }
+    };
+
+    Scope.prototype.__referencing = function __referencing(node, assign, writeExpr, maybeImplicitGlobal) {
+        var ref;
+        // because Array element may be null
+        if (node && node.type === Syntax.Identifier) {
+            ref = new Reference(node, this, assign || Reference.READ, writeExpr, maybeImplicitGlobal);
+            this.references.push(ref);
+            this.left.push(ref);
+        }
+    };
+
+    Scope.prototype.__detectEval = function __detectEval() {
+        var current;
+        current = this;
+        this.directCallToEvalScope = true;
+        do {
+            current.dynamic = true;
+            current = current.upper;
+        } while (current);
+    };
+
+    Scope.prototype.__detectThis = function __detectThis() {
+        this.thisFound = true;
+    };
+
+    Scope.prototype.__isClosed = function isClosed() {
+        return this.left === null;
+    };
+
+    // API Scope#resolve(name)
+    // returns resolved reference
+    Scope.prototype.resolve = function resolve(ident) {
+        var ref, i, iz;
+        assert(this.__isClosed(), 'scope should be closed');
+        assert(ident.type === Syntax.Identifier, 'target should be identifier');
+        for (i = 0, iz = this.references.length; i < iz; ++i) {
+            ref = this.references[i];
+            if (ref.identifier === ident) {
+                return ref;
+            }
+        }
+        return null;
+    };
+
+    // API Scope#isStatic
+    // returns this scope is static
+    Scope.prototype.isStatic = function isStatic() {
+        return !this.dynamic;
+    };
+
+    // API Scope#isArgumentsMaterialized
+    // return this scope has materialized arguments
+    Scope.prototype.isArgumentsMaterialized = function isArgumentsMaterialized() {
+        // TODO(Constellation)
+        // We can more aggressive on this condition like this.
+        //
+        // function t() {
+        //     // arguments of t is always hidden.
+        //     function arguments() {
+        //     }
+        // }
+        var variable;
+
+        // This is not function scope
+        if (this.type !== 'function') {
+            return true;
+        }
+
+        if (!this.isStatic()) {
+            return true;
+        }
+
+        variable = this.set.get('arguments');
+        assert(variable, 'always have arguments variable');
+        return variable.tainted || variable.references.length  !== 0;
+    };
+
+    // API Scope#isThisMaterialized
+    // return this scope has materialized `this` reference
+    Scope.prototype.isThisMaterialized = function isThisMaterialized() {
+        // This is not function scope
+        if (this.type !== 'function') {
+            return true;
+        }
+        if (!this.isStatic()) {
+            return true;
+        }
+        return this.thisFound;
+    };
+
+    Scope.mangledName = '__$escope$__';
+
+    Scope.prototype.attach = function attach() {
+        if (!this.functionExpressionScope) {
+            this.block[Scope.mangledName] = this;
+        }
+    };
+
+    Scope.prototype.detach = function detach() {
+        if (!this.functionExpressionScope) {
+            delete this.block[Scope.mangledName];
+        }
+    };
+
+    Scope.prototype.isUsedName = function (name) {
+        if (this.set.has(name)) {
+            return true;
+        }
+        for (var i = 0, iz = this.through.length; i < iz; ++i) {
+            if (this.through[i].identifier.name === name) {
+                return true;
+            }
+        }
+        return false;
+    };
+
+    /**
+     * @class ScopeManager
+     */
+    function ScopeManager(scopes) {
+        this.scopes = scopes;
+        this.attached = false;
+    }
+
+    // Returns appropliate scope for this node
+    ScopeManager.prototype.__get = function __get(node) {
+        var i, iz, scope;
+        if (this.attached) {
+            return node[Scope.mangledName] || null;
+        }
+        if (Scope.isScopeRequired(node)) {
+            for (i = 0, iz = this.scopes.length; i < iz; ++i) {
+                scope = this.scopes[i];
+                if (!scope.functionExpressionScope) {
+                    if (scope.block === node) {
+                        return scope;
+                    }
+                }
+            }
+        }
+        return null;
+    };
+
+    ScopeManager.prototype.acquire = function acquire(node) {
+        return this.__get(node);
+    };
+
+    ScopeManager.prototype.release = function release(node) {
+        var scope = this.__get(node);
+        if (scope) {
+            scope = scope.upper;
+            while (scope) {
+                if (!scope.functionExpressionScope) {
+                    return scope;
+                }
+                scope = scope.upper;
+            }
+        }
+        return null;
+    };
+
+    ScopeManager.prototype.attach = function attach() {
+        var i, iz;
+        for (i = 0, iz = this.scopes.length; i < iz; ++i) {
+            this.scopes[i].attach();
+        }
+        this.attached = true;
+    };
+
+    ScopeManager.prototype.detach = function detach() {
+        var i, iz;
+        for (i = 0, iz = this.scopes.length; i < iz; ++i) {
+            this.scopes[i].detach();
+        }
+        this.attached = false;
+    };
+
+    Scope.isScopeRequired = function isScopeRequired(node) {
+        return Scope.isVariableScopeRequired(node) || node.type === Syntax.WithStatement || node.type === Syntax.CatchClause;
+    };
+
+    Scope.isVariableScopeRequired = function isVariableScopeRequired(node) {
+        return node.type === Syntax.Program || node.type === Syntax.FunctionExpression || node.type === Syntax.FunctionDeclaration;
+    };
+
+    /**
+     * Main interface function. Takes an Esprima syntax tree and returns the
+     * analyzed scopes.
+     * @function analyze
+     * @param {esprima.Tree} tree
+     * @param {Object} providedOptions - Options that tailor the scope analysis
+     * @param {boolean} [providedOptions.optimistic=false] - the optimistic flag
+     * @param {boolean} [providedOptions.directive=false]- the directive flag
+     * @param {boolean} [providedOptions.ignoreEval=false]- whether to check 'eval()' calls
+     * @return {ScopeManager}
+     */
+    function analyze(tree, providedOptions) {
+        var resultScopes;
+
+        options = updateDeeply(defaultOptions(), providedOptions);
+        resultScopes = scopes = [];
+        currentScope = null;
+        globalScope = null;
+
+        // attach scope and collect / resolve names
+        estraverse.traverse(tree, {
+            enter: function enter(node) {
+                var i, iz, decl;
+                if (Scope.isScopeRequired(node)) {
+                    new Scope(node, {});
+                }
+
+                switch (node.type) {
+                case Syntax.AssignmentExpression:
+                    if (node.operator === '=') {
+                        currentScope.__referencing(node.left, Reference.WRITE, node.right, (!currentScope.isStrict && node.left.name != null) && node);
+                    } else {
+                        currentScope.__referencing(node.left, Reference.RW, node.right);
+                    }
+                    currentScope.__referencing(node.right);
+                    break;
+
+                case Syntax.ArrayExpression:
+                    for (i = 0, iz = node.elements.length; i < iz; ++i) {
+                        currentScope.__referencing(node.elements[i]);
+                    }
+                    break;
+
+                case Syntax.BlockStatement:
+                    break;
+
+                case Syntax.BinaryExpression:
+                    currentScope.__referencing(node.left);
+                    currentScope.__referencing(node.right);
+                    break;
+
+                case Syntax.BreakStatement:
+                    break;
+
+                case Syntax.CallExpression:
+                    currentScope.__referencing(node.callee);
+                    for (i = 0, iz = node['arguments'].length; i < iz; ++i) {
+                        currentScope.__referencing(node['arguments'][i]);
+                    }
+
+                    // check this is direct call to eval
+                    if (!options.ignoreEval && node.callee.type === Syntax.Identifier && node.callee.name === 'eval') {
+                        currentScope.variableScope.__detectEval();
+                    }
+                    break;
+
+                case Syntax.CatchClause:
+                    currentScope.__define(node.param, {
+                        type: Variable.CatchClause,
+                        name: node.param,
+                        node: node
+                    });
+                    break;
+
+                case Syntax.ConditionalExpression:
+                    currentScope.__referencing(node.test);
+                    currentScope.__referencing(node.consequent);
+                    currentScope.__referencing(node.alternate);
+                    break;
+
+                case Syntax.ContinueStatement:
+                    break;
+
+                case Syntax.DirectiveStatement:
+                    break;
+
+                case Syntax.DoWhileStatement:
+                    currentScope.__referencing(node.test);
+                    break;
+
+                case Syntax.DebuggerStatement:
+                    break;
+
+                case Syntax.EmptyStatement:
+                    break;
+
+                case Syntax.ExpressionStatement:
+                    currentScope.__referencing(node.expression);
+                    break;
+
+                case Syntax.ForStatement:
+                    currentScope.__referencing(node.init);
+                    currentScope.__referencing(node.test);
+                    currentScope.__referencing(node.update);
+                    break;
+
+                case Syntax.ForInStatement:
+                    if (node.left.type === Syntax.VariableDeclaration) {
+                        currentScope.__referencing(node.left.declarations[0].id, Reference.WRITE, null, false);
+                    } else {
+                        currentScope.__referencing(node.left, Reference.WRITE, null, (!currentScope.isStrict && node.left.name != null) && node);
+                    }
+                    currentScope.__referencing(node.right);
+                    break;
+
+                case Syntax.FunctionDeclaration:
+                    // FunctionDeclaration name is defined in upper scope
+                    currentScope.upper.__define(node.id, {
+                        type: Variable.FunctionName,
+                        name: node.id,
+                        node: node
+                    });
+                    for (i = 0, iz = node.params.length; i < iz; ++i) {
+                        currentScope.__define(node.params[i], {
+                            type: Variable.Parameter,
+                            name: node.params[i],
+                            node: node,
+                            index: i
+                        });
+                    }
+                    break;
+
+                case Syntax.FunctionExpression:
+                    // id is defined in upper scope
+                    for (i = 0, iz = node.params.length; i < iz; ++i) {
+                        currentScope.__define(node.params[i], {
+                            type: Variable.Parameter,
+                            name: node.params[i],
+                            node: node,
+                            index: i
+                        });
+                    }
+                    break;
+
+                case Syntax.Identifier:
+                    break;
+
+                case Syntax.IfStatement:
+                    currentScope.__referencing(node.test);
+                    break;
+
+                case Syntax.Literal:
+                    break;
+
+                case Syntax.LabeledStatement:
+                    break;
+
+                case Syntax.LogicalExpression:
+                    currentScope.__referencing(node.left);
+                    currentScope.__referencing(node.right);
+                    break;
+
+                case Syntax.MemberExpression:
+                    currentScope.__referencing(node.object);
+                    if (node.computed) {
+                        currentScope.__referencing(node.property);
+                    }
+                    break;
+
+                case Syntax.NewExpression:
+                    currentScope.__referencing(node.callee);
+                    for (i = 0, iz = node['arguments'].length; i < iz; ++i) {
+                        currentScope.__referencing(node['arguments'][i]);
+                    }
+                    break;
+
+                case Syntax.ObjectExpression:
+                    break;
+
+                case Syntax.Program:
+                    break;
+
+                case Syntax.Property:
+                    currentScope.__referencing(node.value);
+                    break;
+
+                case Syntax.ReturnStatement:
+                    currentScope.__referencing(node.argument);
+                    break;
+
+                case Syntax.SequenceExpression:
+                    for (i = 0, iz = node.expressions.length; i < iz; ++i) {
+                        currentScope.__referencing(node.expressions[i]);
+                    }
+                    break;
+
+                case Syntax.SwitchStatement:
+                    currentScope.__referencing(node.discriminant);
+                    break;
+
+                case Syntax.SwitchCase:
+                    currentScope.__referencing(node.test);
+                    break;
+
+                case Syntax.ThisExpression:
+                    currentScope.variableScope.__detectThis();
+                    break;
+
+                case Syntax.ThrowStatement:
+                    currentScope.__referencing(node.argument);
+                    break;
+
+                case Syntax.TryStatement:
+                    break;
+
+                case Syntax.UnaryExpression:
+                    currentScope.__referencing(node.argument);
+                    break;
+
+                case Syntax.UpdateExpression:
+                    currentScope.__referencing(node.argument, Reference.RW, null);
+                    break;
+
+                case Syntax.VariableDeclaration:
+                    for (i = 0, iz = node.declarations.length; i < iz; ++i) {
+                        decl = node.declarations[i];
+                        currentScope.variableScope.__define(decl.id, {
+                            type: Variable.Variable,
+                            name: decl.id,
+                            node: decl,
+                            index: i,
+                            parent: node
+                        });
+                        if (decl.init) {
+                            // initializer is found
+                            currentScope.__referencing(decl.id, Reference.WRITE, decl.init, false);
+                            currentScope.__referencing(decl.init);
+                        }
+                    }
+                    break;
+
+                case Syntax.VariableDeclarator:
+                    break;
+
+                case Syntax.WhileStatement:
+                    currentScope.__referencing(node.test);
+                    break;
+
+                case Syntax.WithStatement:
+                    // WithStatement object is referenced at upper scope
+                    currentScope.upper.__referencing(node.object);
+                    break;
+                }
+            },
+
+            leave: function leave(node) {
+                while (currentScope && node === currentScope.block) {
+                    currentScope.__close();
+                }
+            }
+        });
+
+        assert(currentScope === null);
+        globalScope = null;
+        scopes = null;
+        options = null;
+
+        return new ScopeManager(resultScopes);
+    }
+
+    /** @name module:escope.version */
+    exports.version = '1.0.1';
+    /** @name module:escope.Reference */
+    exports.Reference = Reference;
+    /** @name module:escope.Variable */
+    exports.Variable = Variable;
+    /** @name module:escope.Scope */
+    exports.Scope = Scope;
+    /** @name module:escope.ScopeManager */
+    exports.ScopeManager = ScopeManager;
+    /** @name module:escope.analyze */
+    exports.analyze = analyze;
+}, this));
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/packages/context-coloring/languages/javascript/libraries/esprima.js b/packages/context-coloring/languages/javascript/libraries/esprima.js
new file mode 100644
index 0000000..593021f
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/libraries/esprima.js
@@ -0,0 +1,3756 @@
+/*
+  Copyright (C) 2013 Ariya Hidayat <address@hidden>
+  Copyright (C) 2013 Thaddee Tyl <address@hidden>
+  Copyright (C) 2013 Mathias Bynens <address@hidden>
+  Copyright (C) 2012 Ariya Hidayat <address@hidden>
+  Copyright (C) 2012 Mathias Bynens <address@hidden>
+  Copyright (C) 2012 Joost-Wim Boekesteijn <address@hidden>
+  Copyright (C) 2012 Kris Kowal <address@hidden>
+  Copyright (C) 2012 Yusuke Suzuki <address@hidden>
+  Copyright (C) 2012 Arpad Borsos <address@hidden>
+  Copyright (C) 2011 Ariya Hidayat <address@hidden>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*jslint bitwise:true plusplus:true */
+/*global esprima:true, define:true, exports:true, window: true,
+throwErrorTolerant: true,
+throwError: true, generateStatement: true, peek: true,
+parseAssignmentExpression: true, parseBlock: true, parseExpression: true,
+parseFunctionDeclaration: true, parseFunctionExpression: true,
+parseFunctionSourceElements: true, parseVariableIdentifier: true,
+parseLeftHandSideExpression: true,
+parseUnaryExpression: true,
+parseStatement: true, parseSourceElement: true */
+
+(function (root, factory) {
+    'use strict';
+
+    // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
+    // Rhino, and plain browser loading.
+
+    /* istanbul ignore next */
+    if (typeof define === 'function' && define.amd) {
+        define(['exports'], factory);
+    } else if (typeof exports !== 'undefined') {
+        factory(exports);
+    } else {
+        factory((root.esprima = {}));
+    }
+}(this, function (exports) {
+    'use strict';
+
+    var Token,
+        TokenName,
+        FnExprTokens,
+        Syntax,
+        PropertyKind,
+        Messages,
+        Regex,
+        SyntaxTreeDelegate,
+        source,
+        strict,
+        index,
+        lineNumber,
+        lineStart,
+        length,
+        delegate,
+        lookahead,
+        state,
+        extra;
+
+    Token = {
+        BooleanLiteral: 1,
+        EOF: 2,
+        Identifier: 3,
+        Keyword: 4,
+        NullLiteral: 5,
+        NumericLiteral: 6,
+        Punctuator: 7,
+        StringLiteral: 8,
+        RegularExpression: 9
+    };
+
+    TokenName = {};
+    TokenName[Token.BooleanLiteral] = 'Boolean';
+    TokenName[Token.EOF] = '<end>';
+    TokenName[Token.Identifier] = 'Identifier';
+    TokenName[Token.Keyword] = 'Keyword';
+    TokenName[Token.NullLiteral] = 'Null';
+    TokenName[Token.NumericLiteral] = 'Numeric';
+    TokenName[Token.Punctuator] = 'Punctuator';
+    TokenName[Token.StringLiteral] = 'String';
+    TokenName[Token.RegularExpression] = 'RegularExpression';
+
+    // A function following one of those tokens is an expression.
+    FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
+                    'return', 'case', 'delete', 'throw', 'void',
+                    // assignment operators
+                    '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
+                    '&=', '|=', '^=', ',',
+                    // binary/unary operators
+                    '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
+                    '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
+                    '<=', '<', '>', '!=', '!=='];
+
+    Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        ArrayExpression: 'ArrayExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        Program: 'Program',
+        Property: 'Property',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement'
+    };
+
+    PropertyKind = {
+        Data: 1,
+        Get: 2,
+        Set: 4
+    };
+
+    // Error messages should be identical to V8.
+    Messages = {
+        UnexpectedToken:  'Unexpected token %0',
+        UnexpectedNumber:  'Unexpected number',
+        UnexpectedString:  'Unexpected string',
+        UnexpectedIdentifier:  'Unexpected identifier',
+        UnexpectedReserved:  'Unexpected reserved word',
+        UnexpectedEOS:  'Unexpected end of input',
+        NewlineAfterThrow:  'Illegal newline after throw',
+        InvalidRegExp: 'Invalid regular expression',
+        UnterminatedRegExp:  'Invalid regular expression: missing /',
+        InvalidLHSInAssignment:  'Invalid left-hand side in assignment',
+        InvalidLHSInForIn:  'Invalid left-hand side in for-in',
+        MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
+        NoCatchOrFinally:  'Missing catch or finally after try',
+        UnknownLabel: 'Undefined label \'%0\'',
+        Redeclaration: '%0 \'%1\' has already been declared',
+        IllegalContinue: 'Illegal continue statement',
+        IllegalBreak: 'Illegal break statement',
+        IllegalReturn: 'Illegal return statement',
+        StrictModeWith:  'Strict mode code may not include a with statement',
+        StrictCatchVariable:  'Catch variable may not be eval or arguments in strict mode',
+        StrictVarName:  'Variable name may not be eval or arguments in strict mode',
+        StrictParamName:  'Parameter name eval or arguments is not allowed in strict mode',
+        StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
+        StrictFunctionName:  'Function name may not be eval or arguments in strict mode',
+        StrictOctalLiteral:  'Octal literals are not allowed in strict mode.',
+        StrictDelete:  'Delete of an unqualified identifier in strict mode.',
+        StrictDuplicateProperty:  'Duplicate data property in object literal not allowed in strict mode',
+        AccessorDataProperty:  'Object literal may not have data and accessor property with the same name',
+        AccessorGetSet:  'Object literal may not have multiple get/set accessors with the same name',
+        StrictLHSAssignment:  'Assignment to eval or arguments is not allowed in strict mode',
+        StrictLHSPostfix:  'Postfix increment/decrement may not have eval or arguments operand in strict mode',
+        StrictLHSPrefix:  'Prefix increment/decrement may not have eval or arguments operand in strict mode',
+        StrictReservedWord:  'Use of future reserved word in strict mode'
+    };
+
+    // See also tools/generate-unicode-regex.py.
+    Regex = {
+        NonAsciiIdentifierStart: new RegExp('[\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F0\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]'),
+        NonAsciiIdentifierPart: new RegExp('[\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0300-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u0483-\u0487\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u05D0-\u05EA\u05F0-\u05F2\u0610-\u061A\u0620-\u0669\u066E-\u06D3\u06D5-\u06DC\u06DF-\u06E8\u06EA-\u06FC\u06FF\u0710-\u074A\u074D-\u07B1\u07C0-\u07F5\u07FA\u0800-\u082D\u0840-\u085B\u08A0\u08A2-\u08AC\u08E4-\u08FE\u0900-\u0963\u0966-\u096F\u0971-\u0977\u0979-\u097F\u0981-\u0983\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BC-\u09C4\u09C7\u09C8\u09CB-\u09CE\u09D7\u09DC\u09DD\u09DF-\u09E3\u09E6-\u09F1\u0A01-\u0A03\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A59-\u0A5C\u0A5E\u0A66-\u0A75\u0A81-\u0A83\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABC-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AD0\u0AE0-\u0AE3\u0AE6-\u0AEF\u0B01-\u0B03\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3C-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B5C\u0B5D\u0B5F-\u0B63\u0B66-\u0B6F\u0B71\u0B82\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD0\u0BD7\u0BE6-\u0BEF\u0C01-\u0C03\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C58\u0C59\u0C60-\u0C63\u0C66-\u0C6F\u0C82\u0C83\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBC-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CDE\u0CE0-\u0CE3\u0CE6-\u0CEF\u0CF1\u0CF2\u0D02\u0D03\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D-\u0D44\u0D46-\u0D48\u0D4A-\u0D4E\u0D57\u0D60-\u0D63\u0D66-\u0D6F\u0D7A-\u0D7F\u0D82\u0D83\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DF2\u0DF3\u0E01-\u0E3A\u0E40-\u0E4E\u0E50-\u0E59\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB9\u0EBB-\u0EBD\u0EC0-\u0EC4\u0EC6\u0EC8-\u0ECD\u0ED0-\u0ED9\u0EDC-\u0EDF\u0F00\u0F18\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E-\u0F47\u0F49-\u0F6C\u0F71-\u0F84\u0F86-\u0F97\u0F99-\u0FBC\u0FC6\u1000-\u1049\u1050-\u109D\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u135D-\u135F\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F0\u1700-\u170C\u170E-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176C\u176E-\u1770\u1772\u1773\u1780-\u17D3\u17D7\u17DC\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u1820-\u1877\u1880-\u18AA\u18B0-\u18F5\u1900-\u191C\u1920-\u192B\u1930-\u193B\u1946-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u19D0-\u19D9\u1A00-\u1A1B\u1A20-\u1A5E\u1A60-\u1A7C\u1A7F-\u1A89\u1A90-\u1A99\u1AA7\u1B00-\u1B4B\u1B50-\u1B59\u1B6B-\u1B73\u1B80-\u1BF3\u1C00-\u1C37\u1C40-\u1C49\u1C4D-\u1C7D\u1CD0-\u1CD2\u1CD4-\u1CF6\u1D00-\u1DE6\u1DFC-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u200C\u200D\u203F\u2040\u2054\u2071\u207F\u2090-\u209C\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D7F-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2DE0-\u2DFF\u2E2F\u3005-\u3007\u3021-\u302F\u3031-\u3035\u3038-\u303C\u3041-\u3096\u3099\u309A\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA62B\uA640-\uA66F\uA674-\uA67D\uA67F-\uA697\uA69F-\uA6F1\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA827\uA840-\uA873\uA880-\uA8C4\uA8D0-\uA8D9\uA8E0-\uA8F7\uA8FB\uA900-\uA92D\uA930-\uA953\uA960-\uA97C\uA980-\uA9C0\uA9CF-\uA9D9\uAA00-\uAA36\uAA40-\uAA4D\uAA50-\uAA59\uAA60-\uAA76\uAA7A\uAA7B\uAA80-\uAAC2\uAADB-\uAADD\uAAE0-\uAAEF\uAAF2-\uAAF6\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABEA\uABEC\uABED\uABF0-\uABF9\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE00-\uFE0F\uFE20-\uFE26\uFE33\uFE34\uFE4D-\uFE4F\uFE70-\uFE74\uFE76-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF3F\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]')
+    };
+
+    // Ensure the condition is true, otherwise throw an error.
+    // This is only to have a better contract semantic, i.e. another safety net
+    // to catch a logic error. The condition shall be fulfilled in normal case.
+    // Do NOT use this to enforce a certain condition on any user input.
+
+    function assert(condition, message) {
+        /* istanbul ignore if */
+        if (!condition) {
+            throw new Error('ASSERT: ' + message);
+        }
+    }
+
+    function isDecimalDigit(ch) {
+        return (ch >= 48 && ch <= 57);   // 0..9
+    }
+
+    function isHexDigit(ch) {
+        return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
+    }
+
+    function isOctalDigit(ch) {
+        return '01234567'.indexOf(ch) >= 0;
+    }
+
+
+    // 7.2 White Space
+
+    function isWhiteSpace(ch) {
+        return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) ||
+            (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0);
+    }
+
+    // 7.3 Line Terminators
+
+    function isLineTerminator(ch) {
+        return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029);
+    }
+
+    // 7.6 Identifier Names and Identifiers
+
+    function isIdentifierStart(ch) {
+        return (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
+            (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
+            (ch >= 0x61 && ch <= 0x7A) ||         // a..z
+            (ch === 0x5C) ||                      // \ (backslash)
+            ((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(String.fromCharCode(ch)));
+    }
+
+    function isIdentifierPart(ch) {
+        return (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
+            (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
+            (ch >= 0x61 && ch <= 0x7A) ||         // a..z
+            (ch >= 0x30 && ch <= 0x39) ||         // 0..9
+            (ch === 0x5C) ||                      // \ (backslash)
+            ((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(String.fromCharCode(ch)));
+    }
+
+    // 7.6.1.2 Future Reserved Words
+
+    function isFutureReservedWord(id) {
+        switch (id) {
+        case 'class':
+        case 'enum':
+        case 'export':
+        case 'extends':
+        case 'import':
+        case 'super':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    function isStrictModeReservedWord(id) {
+        switch (id) {
+        case 'implements':
+        case 'interface':
+        case 'package':
+        case 'private':
+        case 'protected':
+        case 'public':
+        case 'static':
+        case 'yield':
+        case 'let':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    function isRestrictedWord(id) {
+        return id === 'eval' || id === 'arguments';
+    }
+
+    // 7.6.1.1 Keywords
+
+    function isKeyword(id) {
+        if (strict && isStrictModeReservedWord(id)) {
+            return true;
+        }
+
+        // 'const' is specialized as Keyword in V8.
+        // 'yield' and 'let' are for compatiblity with SpiderMonkey and ES.next.
+        // Some others are from future reserved words.
+
+        switch (id.length) {
+        case 2:
+            return (id === 'if') || (id === 'in') || (id === 'do');
+        case 3:
+            return (id === 'var') || (id === 'for') || (id === 'new') ||
+                (id === 'try') || (id === 'let');
+        case 4:
+            return (id === 'this') || (id === 'else') || (id === 'case') ||
+                (id === 'void') || (id === 'with') || (id === 'enum');
+        case 5:
+            return (id === 'while') || (id === 'break') || (id === 'catch') ||
+                (id === 'throw') || (id === 'const') || (id === 'yield') ||
+                (id === 'class') || (id === 'super');
+        case 6:
+            return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
+                (id === 'switch') || (id === 'export') || (id === 'import');
+        case 7:
+            return (id === 'default') || (id === 'finally') || (id === 'extends');
+        case 8:
+            return (id === 'function') || (id === 'continue') || (id === 'debugger');
+        case 10:
+            return (id === 'instanceof');
+        default:
+            return false;
+        }
+    }
+
+    // 7.4 Comments
+
+    function addComment(type, value, start, end, loc) {
+        var comment, attacher;
+
+        assert(typeof start === 'number', 'Comment must have valid position');
+
+        // Because the way the actual token is scanned, often the comments
+        // (if any) are skipped twice during the lexical analysis.
+        // Thus, we need to skip adding a comment if the comment array already
+        // handled it.
+        if (state.lastCommentStart >= start) {
+            return;
+        }
+        state.lastCommentStart = start;
+
+        comment = {
+            type: type,
+            value: value
+        };
+        if (extra.range) {
+            comment.range = [start, end];
+        }
+        if (extra.loc) {
+            comment.loc = loc;
+        }
+        extra.comments.push(comment);
+        if (extra.attachComment) {
+            extra.leadingComments.push(comment);
+            extra.trailingComments.push(comment);
+        }
+    }
+
+    function skipSingleLineComment(offset) {
+        var start, loc, ch, comment;
+
+        start = index - offset;
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart - offset
+            }
+        };
+
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            ++index;
+            if (isLineTerminator(ch)) {
+                if (extra.comments) {
+                    comment = source.slice(start + offset, index - 1);
+                    loc.end = {
+                        line: lineNumber,
+                        column: index - lineStart - 1
+                    };
+                    addComment('Line', comment, start, index - 1, loc);
+                }
+                if (ch === 13 && source.charCodeAt(index) === 10) {
+                    ++index;
+                }
+                ++lineNumber;
+                lineStart = index;
+                return;
+            }
+        }
+
+        if (extra.comments) {
+            comment = source.slice(start + offset, index);
+            loc.end = {
+                line: lineNumber,
+                column: index - lineStart
+            };
+            addComment('Line', comment, start, index, loc);
+        }
+    }
+
+    function skipMultiLineComment() {
+        var start, loc, ch, comment;
+
+        if (extra.comments) {
+            start = index - 2;
+            loc = {
+                start: {
+                    line: lineNumber,
+                    column: index - lineStart - 2
+                }
+            };
+        }
+
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (isLineTerminator(ch)) {
+                if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) {
+                    ++index;
+                }
+                ++lineNumber;
+                ++index;
+                lineStart = index;
+                if (index >= length) {
+                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+            } else if (ch === 0x2A) {
+                // Block comment ends with '*/'.
+                if (source.charCodeAt(index + 1) === 0x2F) {
+                    ++index;
+                    ++index;
+                    if (extra.comments) {
+                        comment = source.slice(start + 2, index - 2);
+                        loc.end = {
+                            line: lineNumber,
+                            column: index - lineStart
+                        };
+                        addComment('Block', comment, start, index, loc);
+                    }
+                    return;
+                }
+                ++index;
+            } else {
+                ++index;
+            }
+        }
+
+        throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+    }
+
+    function skipComment() {
+        var ch, start;
+
+        start = (index === 0);
+        while (index < length) {
+            ch = source.charCodeAt(index);
+
+            if (isWhiteSpace(ch)) {
+                ++index;
+            } else if (isLineTerminator(ch)) {
+                ++index;
+                if (ch === 0x0D && source.charCodeAt(index) === 0x0A) {
+                    ++index;
+                }
+                ++lineNumber;
+                lineStart = index;
+                start = true;
+            } else if (ch === 0x2F) { // U+002F is '/'
+                ch = source.charCodeAt(index + 1);
+                if (ch === 0x2F) {
+                    ++index;
+                    ++index;
+                    skipSingleLineComment(2);
+                    start = true;
+                } else if (ch === 0x2A) {  // U+002A is '*'
+                    ++index;
+                    ++index;
+                    skipMultiLineComment();
+                } else {
+                    break;
+                }
+            } else if (start && ch === 0x2D) { // U+002D is '-'
+                // U+003E is '>'
+                if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) {
+                    // '-->' is a single-line comment
+                    index += 3;
+                    skipSingleLineComment(3);
+                } else {
+                    break;
+                }
+            } else if (ch === 0x3C) { // U+003C is '<'
+                if (source.slice(index + 1, index + 4) === '!--') {
+                    ++index; // `<`
+                    ++index; // `!`
+                    ++index; // `-`
+                    ++index; // `-`
+                    skipSingleLineComment(4);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+    }
+
+    function scanHexEscape(prefix) {
+        var i, len, ch, code = 0;
+
+        len = (prefix === 'u') ? 4 : 2;
+        for (i = 0; i < len; ++i) {
+            if (index < length && isHexDigit(source[index])) {
+                ch = source[index++];
+                code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
+            } else {
+                return '';
+            }
+        }
+        return String.fromCharCode(code);
+    }
+
+    function getEscapedIdentifier() {
+        var ch, id;
+
+        ch = source.charCodeAt(index++);
+        id = String.fromCharCode(ch);
+
+        // '\u' (U+005C, U+0075) denotes an escaped character.
+        if (ch === 0x5C) {
+            if (source.charCodeAt(index) !== 0x75) {
+                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+            }
+            ++index;
+            ch = scanHexEscape('u');
+            if (!ch || ch === '\\' || !isIdentifierStart(ch.charCodeAt(0))) {
+                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+            }
+            id = ch;
+        }
+
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (!isIdentifierPart(ch)) {
+                break;
+            }
+            ++index;
+            id += String.fromCharCode(ch);
+
+            // '\u' (U+005C, U+0075) denotes an escaped character.
+            if (ch === 0x5C) {
+                id = id.substr(0, id.length - 1);
+                if (source.charCodeAt(index) !== 0x75) {
+                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+                ++index;
+                ch = scanHexEscape('u');
+                if (!ch || ch === '\\' || !isIdentifierPart(ch.charCodeAt(0))) {
+                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+                id += ch;
+            }
+        }
+
+        return id;
+    }
+
+    function getIdentifier() {
+        var start, ch;
+
+        start = index++;
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (ch === 0x5C) {
+                // Blackslash (U+005C) marks Unicode escape sequence.
+                index = start;
+                return getEscapedIdentifier();
+            }
+            if (isIdentifierPart(ch)) {
+                ++index;
+            } else {
+                break;
+            }
+        }
+
+        return source.slice(start, index);
+    }
+
+    function scanIdentifier() {
+        var start, id, type;
+
+        start = index;
+
+        // Backslash (U+005C) starts an escaped character.
+        id = (source.charCodeAt(index) === 0x5C) ? getEscapedIdentifier() : getIdentifier();
+
+        // There is no keyword or literal with only one character.
+        // Thus, it must be an identifier.
+        if (id.length === 1) {
+            type = Token.Identifier;
+        } else if (isKeyword(id)) {
+            type = Token.Keyword;
+        } else if (id === 'null') {
+            type = Token.NullLiteral;
+        } else if (id === 'true' || id === 'false') {
+            type = Token.BooleanLiteral;
+        } else {
+            type = Token.Identifier;
+        }
+
+        return {
+            type: type,
+            value: id,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+
+    // 7.7 Punctuators
+
+    function scanPunctuator() {
+        var start = index,
+            code = source.charCodeAt(index),
+            code2,
+            ch1 = source[index],
+            ch2,
+            ch3,
+            ch4;
+
+        switch (code) {
+
+        // Check for most common single-character punctuators.
+        case 0x2E:  // . dot
+        case 0x28:  // ( open bracket
+        case 0x29:  // ) close bracket
+        case 0x3B:  // ; semicolon
+        case 0x2C:  // , comma
+        case 0x7B:  // { open curly brace
+        case 0x7D:  // } close curly brace
+        case 0x5B:  // [
+        case 0x5D:  // ]
+        case 0x3A:  // :
+        case 0x3F:  // ?
+        case 0x7E:  // ~
+            ++index;
+            if (extra.tokenize) {
+                if (code === 0x28) {
+                    extra.openParenToken = extra.tokens.length;
+                } else if (code === 0x7B) {
+                    extra.openCurlyToken = extra.tokens.length;
+                }
+            }
+            return {
+                type: Token.Punctuator,
+                value: String.fromCharCode(code),
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+
+        default:
+            code2 = source.charCodeAt(index + 1);
+
+            // '=' (U+003D) marks an assignment or comparison operator.
+            if (code2 === 0x3D) {
+                switch (code) {
+                case 0x2B:  // +
+                case 0x2D:  // -
+                case 0x2F:  // /
+                case 0x3C:  // <
+                case 0x3E:  // >
+                case 0x5E:  // ^
+                case 0x7C:  // |
+                case 0x25:  // %
+                case 0x26:  // &
+                case 0x2A:  // *
+                    index += 2;
+                    return {
+                        type: Token.Punctuator,
+                        value: String.fromCharCode(code) + String.fromCharCode(code2),
+                        lineNumber: lineNumber,
+                        lineStart: lineStart,
+                        start: start,
+                        end: index
+                    };
+
+                case 0x21: // !
+                case 0x3D: // =
+                    index += 2;
+
+                    // !== and ===
+                    if (source.charCodeAt(index) === 0x3D) {
+                        ++index;
+                    }
+                    return {
+                        type: Token.Punctuator,
+                        value: source.slice(start, index),
+                        lineNumber: lineNumber,
+                        lineStart: lineStart,
+                        start: start,
+                        end: index
+                    };
+                }
+            }
+        }
+
+        // 4-character punctuator: >>>=
+
+        ch4 = source.substr(index, 4);
+
+        if (ch4 === '>>>=') {
+            index += 4;
+            return {
+                type: Token.Punctuator,
+                value: ch4,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        // 3-character punctuators: === !== >>> <<= >>=
+
+        ch3 = ch4.substr(0, 3);
+
+        if (ch3 === '>>>' || ch3 === '<<=' || ch3 === '>>=') {
+            index += 3;
+            return {
+                type: Token.Punctuator,
+                value: ch3,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        // Other 2-character punctuators: ++ -- << >> && ||
+        ch2 = ch3.substr(0, 2);
+
+        if ((ch1 === ch2[1] && ('+-<>&|'.indexOf(ch1) >= 0)) || ch2 === '=>') {
+            index += 2;
+            return {
+                type: Token.Punctuator,
+                value: ch2,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        // 1-character punctuators: < > = ! + - * % & | ^ /
+        if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
+            ++index;
+            return {
+                type: Token.Punctuator,
+                value: ch1,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+    }
+
+    // 7.8.3 Numeric Literals
+
+    function scanHexLiteral(start) {
+        var number = '';
+
+        while (index < length) {
+            if (!isHexDigit(source[index])) {
+                break;
+            }
+            number += source[index++];
+        }
+
+        if (number.length === 0) {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index))) {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseInt('0x' + number, 16),
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function scanOctalLiteral(start) {
+        var number = '0' + source[index++];
+        while (index < length) {
+            if (!isOctalDigit(source[index])) {
+                break;
+            }
+            number += source[index++];
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseInt(number, 8),
+            octal: true,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function scanNumericLiteral() {
+        var number, start, ch;
+
+        ch = source[index];
+        assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
+            'Numeric literal must start with a decimal digit or a decimal point');
+
+        start = index;
+        number = '';
+        if (ch !== '.') {
+            number = source[index++];
+            ch = source[index];
+
+            // Hex number starts with '0x'.
+            // Octal number starts with '0'.
+            if (number === '0') {
+                if (ch === 'x' || ch === 'X') {
+                    ++index;
+                    return scanHexLiteral(start);
+                }
+                if (isOctalDigit(ch)) {
+                    return scanOctalLiteral(start);
+                }
+
+                // decimal number starts with '0' such as '09' is illegal.
+                if (ch && isDecimalDigit(ch.charCodeAt(0))) {
+                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+            }
+
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === '.') {
+            number += source[index++];
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === 'e' || ch === 'E') {
+            number += source[index++];
+
+            ch = source[index];
+            if (ch === '+' || ch === '-') {
+                number += source[index++];
+            }
+            if (isDecimalDigit(source.charCodeAt(index))) {
+                while (isDecimalDigit(source.charCodeAt(index))) {
+                    number += source[index++];
+                }
+            } else {
+                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+            }
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index))) {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseFloat(number),
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    // 7.8.4 String Literals
+
+    function scanStringLiteral() {
+        var str = '', quote, start, ch, code, unescaped, restore, octal = false, startLineNumber, startLineStart;
+        startLineNumber = lineNumber;
+        startLineStart = lineStart;
+
+        quote = source[index];
+        assert((quote === '\'' || quote === '"'),
+            'String literal must starts with a quote');
+
+        start = index;
+        ++index;
+
+        while (index < length) {
+            ch = source[index++];
+
+            if (ch === quote) {
+                quote = '';
+                break;
+            } else if (ch === '\\') {
+                ch = source[index++];
+                if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
+                    switch (ch) {
+                    case 'u':
+                    case 'x':
+                        restore = index;
+                        unescaped = scanHexEscape(ch);
+                        if (unescaped) {
+                            str += unescaped;
+                        } else {
+                            index = restore;
+                            str += ch;
+                        }
+                        break;
+                    case 'n':
+                        str += '\n';
+                        break;
+                    case 'r':
+                        str += '\r';
+                        break;
+                    case 't':
+                        str += '\t';
+                        break;
+                    case 'b':
+                        str += '\b';
+                        break;
+                    case 'f':
+                        str += '\f';
+                        break;
+                    case 'v':
+                        str += '\x0B';
+                        break;
+
+                    default:
+                        if (isOctalDigit(ch)) {
+                            code = '01234567'.indexOf(ch);
+
+                            // \0 is not octal escape sequence
+                            if (code !== 0) {
+                                octal = true;
+                            }
+
+                            if (index < length && isOctalDigit(source[index])) {
+                                octal = true;
+                                code = code * 8 + '01234567'.indexOf(source[index++]);
+
+                                // 3 digits are only allowed when string starts
+                                // with 0, 1, 2, 3
+                                if ('0123'.indexOf(ch) >= 0 &&
+                                        index < length &&
+                                        isOctalDigit(source[index])) {
+                                    code = code * 8 + '01234567'.indexOf(source[index++]);
+                                }
+                            }
+                            str += String.fromCharCode(code);
+                        } else {
+                            str += ch;
+                        }
+                        break;
+                    }
+                } else {
+                    ++lineNumber;
+                    if (ch ===  '\r' && source[index] === '\n') {
+                        ++index;
+                    }
+                    lineStart = index;
+                }
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                break;
+            } else {
+                str += ch;
+            }
+        }
+
+        if (quote !== '') {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.StringLiteral,
+            value: str,
+            octal: octal,
+            startLineNumber: startLineNumber,
+            startLineStart: startLineStart,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function testRegExp(pattern, flags) {
+        var value;
+        try {
+            value = new RegExp(pattern, flags);
+        } catch (e) {
+            throwError({}, Messages.InvalidRegExp);
+        }
+        return value;
+    }
+
+    function scanRegExpBody() {
+        var ch, str, classMarker, terminated, body;
+
+        ch = source[index];
+        assert(ch === '/', 'Regular expression literal must start with a slash');
+        str = source[index++];
+
+        classMarker = false;
+        terminated = false;
+        while (index < length) {
+            ch = source[index++];
+            str += ch;
+            if (ch === '\\') {
+                ch = source[index++];
+                // ECMA-262 7.8.5
+                if (isLineTerminator(ch.charCodeAt(0))) {
+                    throwError({}, Messages.UnterminatedRegExp);
+                }
+                str += ch;
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                throwError({}, Messages.UnterminatedRegExp);
+            } else if (classMarker) {
+                if (ch === ']') {
+                    classMarker = false;
+                }
+            } else {
+                if (ch === '/') {
+                    terminated = true;
+                    break;
+                } else if (ch === '[') {
+                    classMarker = true;
+                }
+            }
+        }
+
+        if (!terminated) {
+            throwError({}, Messages.UnterminatedRegExp);
+        }
+
+        // Exclude leading and trailing slash.
+        body = str.substr(1, str.length - 2);
+        return {
+            value: body,
+            literal: str
+        };
+    }
+
+    function scanRegExpFlags() {
+        var ch, str, flags, restore;
+
+        str = '';
+        flags = '';
+        while (index < length) {
+            ch = source[index];
+            if (!isIdentifierPart(ch.charCodeAt(0))) {
+                break;
+            }
+
+            ++index;
+            if (ch === '\\' && index < length) {
+                ch = source[index];
+                if (ch === 'u') {
+                    ++index;
+                    restore = index;
+                    ch = scanHexEscape('u');
+                    if (ch) {
+                        flags += ch;
+                        for (str += '\\u'; restore < index; ++restore) {
+                            str += source[restore];
+                        }
+                    } else {
+                        index = restore;
+                        flags += 'u';
+                        str += '\\u';
+                    }
+                    throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL');
+                } else {
+                    str += '\\';
+                    throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+            } else {
+                flags += ch;
+                str += ch;
+            }
+        }
+
+        return {
+            value: flags,
+            literal: str
+        };
+    }
+
+    function scanRegExp() {
+        var start, body, flags, pattern, value;
+
+        lookahead = null;
+        skipComment();
+        start = index;
+
+        body = scanRegExpBody();
+        flags = scanRegExpFlags();
+        value = testRegExp(body.value, flags.value);
+
+        if (extra.tokenize) {
+            return {
+                type: Token.RegularExpression,
+                value: value,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        return {
+            literal: body.literal + flags.literal,
+            value: value,
+            start: start,
+            end: index
+        };
+    }
+
+    function collectRegex() {
+        var pos, loc, regex, token;
+
+        skipComment();
+
+        pos = index;
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart
+            }
+        };
+
+        regex = scanRegExp();
+        loc.end = {
+            line: lineNumber,
+            column: index - lineStart
+        };
+
+        /* istanbul ignore next */
+        if (!extra.tokenize) {
+            // Pop the previous token, which is likely '/' or '/='
+            if (extra.tokens.length > 0) {
+                token = extra.tokens[extra.tokens.length - 1];
+                if (token.range[0] === pos && token.type === 'Punctuator') {
+                    if (token.value === '/' || token.value === '/=') {
+                        extra.tokens.pop();
+                    }
+                }
+            }
+
+            extra.tokens.push({
+                type: 'RegularExpression',
+                value: regex.literal,
+                range: [pos, index],
+                loc: loc
+            });
+        }
+
+        return regex;
+    }
+
+    function isIdentifierName(token) {
+        return token.type === Token.Identifier ||
+            token.type === Token.Keyword ||
+            token.type === Token.BooleanLiteral ||
+            token.type === Token.NullLiteral;
+    }
+
+    function advanceSlash() {
+        var prevToken,
+            checkToken;
+        // Using the following algorithm:
+        // https://github.com/mozilla/sweet.js/wiki/design
+        prevToken = extra.tokens[extra.tokens.length - 1];
+        if (!prevToken) {
+            // Nothing before that: it cannot be a division.
+            return collectRegex();
+        }
+        if (prevToken.type === 'Punctuator') {
+            if (prevToken.value === ']') {
+                return scanPunctuator();
+            }
+            if (prevToken.value === ')') {
+                checkToken = extra.tokens[extra.openParenToken - 1];
+                if (checkToken &&
+                        checkToken.type === 'Keyword' &&
+                        (checkToken.value === 'if' ||
+                         checkToken.value === 'while' ||
+                         checkToken.value === 'for' ||
+                         checkToken.value === 'with')) {
+                    return collectRegex();
+                }
+                return scanPunctuator();
+            }
+            if (prevToken.value === '}') {
+                // Dividing a function by anything makes little sense,
+                // but we have to check for that.
+                if (extra.tokens[extra.openCurlyToken - 3] &&
+                        extra.tokens[extra.openCurlyToken - 3].type === 'Keyword') {
+                    // Anonymous function.
+                    checkToken = extra.tokens[extra.openCurlyToken - 4];
+                    if (!checkToken) {
+                        return scanPunctuator();
+                    }
+                } else if (extra.tokens[extra.openCurlyToken - 4] &&
+                        extra.tokens[extra.openCurlyToken - 4].type === 'Keyword') {
+                    // Named function.
+                    checkToken = extra.tokens[extra.openCurlyToken - 5];
+                    if (!checkToken) {
+                        return collectRegex();
+                    }
+                } else {
+                    return scanPunctuator();
+                }
+                // checkToken determines whether the function is
+                // a declaration or an expression.
+                if (FnExprTokens.indexOf(checkToken.value) >= 0) {
+                    // It is an expression.
+                    return scanPunctuator();
+                }
+                // It is a declaration.
+                return collectRegex();
+            }
+            return collectRegex();
+        }
+        if (prevToken.type === 'Keyword') {
+            return collectRegex();
+        }
+        return scanPunctuator();
+    }
+
+    function advance() {
+        var ch;
+
+        skipComment();
+
+        if (index >= length) {
+            return {
+                type: Token.EOF,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: index,
+                end: index
+            };
+        }
+
+        ch = source.charCodeAt(index);
+
+        if (isIdentifierStart(ch)) {
+            return scanIdentifier();
+        }
+
+        // Very common: ( and ) and ;
+        if (ch === 0x28 || ch === 0x29 || ch === 0x3B) {
+            return scanPunctuator();
+        }
+
+        // String literal starts with single quote (U+0027) or double quote (U+0022).
+        if (ch === 0x27 || ch === 0x22) {
+            return scanStringLiteral();
+        }
+
+
+        // Dot (.) U+002E can also start a floating-point number, hence the need
+        // to check the next character.
+        if (ch === 0x2E) {
+            if (isDecimalDigit(source.charCodeAt(index + 1))) {
+                return scanNumericLiteral();
+            }
+            return scanPunctuator();
+        }
+
+        if (isDecimalDigit(ch)) {
+            return scanNumericLiteral();
+        }
+
+        // Slash (/) U+002F can also start a regex.
+        if (extra.tokenize && ch === 0x2F) {
+            return advanceSlash();
+        }
+
+        return scanPunctuator();
+    }
+
+    function collectToken() {
+        var loc, token, range, value;
+
+        skipComment();
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart
+            }
+        };
+
+        token = advance();
+        loc.end = {
+            line: lineNumber,
+            column: index - lineStart
+        };
+
+        if (token.type !== Token.EOF) {
+            value = source.slice(token.start, token.end);
+            extra.tokens.push({
+                type: TokenName[token.type],
+                value: value,
+                range: [token.start, token.end],
+                loc: loc
+            });
+        }
+
+        return token;
+    }
+
+    function lex() {
+        var token;
+
+        token = lookahead;
+        index = token.end;
+        lineNumber = token.lineNumber;
+        lineStart = token.lineStart;
+
+        lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
+
+        index = token.end;
+        lineNumber = token.lineNumber;
+        lineStart = token.lineStart;
+
+        return token;
+    }
+
+    function peek() {
+        var pos, line, start;
+
+        pos = index;
+        line = lineNumber;
+        start = lineStart;
+        lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
+        index = pos;
+        lineNumber = line;
+        lineStart = start;
+    }
+
+    function Position(line, column) {
+        this.line = line;
+        this.column = column;
+    }
+
+    function SourceLocation(startLine, startColumn, line, column) {
+        this.start = new Position(startLine, startColumn);
+        this.end = new Position(line, column);
+    }
+
+    SyntaxTreeDelegate = {
+
+        name: 'SyntaxTree',
+
+        processComment: function (node) {
+            var lastChild, trailingComments;
+
+            if (node.type === Syntax.Program) {
+                if (node.body.length > 0) {
+                    return;
+                }
+            }
+
+            if (extra.trailingComments.length > 0) {
+                if (extra.trailingComments[0].range[0] >= node.range[1]) {
+                    trailingComments = extra.trailingComments;
+                    extra.trailingComments = [];
+                } else {
+                    extra.trailingComments.length = 0;
+                }
+            } else {
+                if (extra.bottomRightStack.length > 0 &&
+                        extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments &&
+                        extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments[0].range[0] >= node.range[1]) {
+                    trailingComments = extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments;
+                    delete extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments;
+                }
+            }
+
+            // Eating the stack.
+            while (extra.bottomRightStack.length > 0 && extra.bottomRightStack[extra.bottomRightStack.length - 1].range[0] >= node.range[0]) {
+                lastChild = extra.bottomRightStack.pop();
+            }
+
+            if (lastChild) {
+                if (lastChild.leadingComments && lastChild.leadingComments[lastChild.leadingComments.length - 1].range[1] <= node.range[0]) {
+                    node.leadingComments = lastChild.leadingComments;
+                    delete lastChild.leadingComments;
+                }
+            } else if (extra.leadingComments.length > 0 && extra.leadingComments[extra.leadingComments.length - 1].range[1] <= node.range[0]) {
+                node.leadingComments = extra.leadingComments;
+                extra.leadingComments = [];
+            }
+
+
+            if (trailingComments) {
+                node.trailingComments = trailingComments;
+            }
+
+            extra.bottomRightStack.push(node);
+        },
+
+        markEnd: function (node, startToken) {
+            if (extra.range) {
+                node.range = [startToken.start, index];
+            }
+            if (extra.loc) {
+                node.loc = new SourceLocation(
+                    startToken.startLineNumber === undefined ?  startToken.lineNumber : startToken.startLineNumber,
+                    startToken.start - (startToken.startLineStart === undefined ?  startToken.lineStart : startToken.startLineStart),
+                    lineNumber,
+                    index - lineStart
+                );
+                this.postProcess(node);
+            }
+
+            if (extra.attachComment) {
+                this.processComment(node);
+            }
+            return node;
+        },
+
+        postProcess: function (node) {
+            if (extra.source) {
+                node.loc.source = extra.source;
+            }
+            return node;
+        },
+
+        createArrayExpression: function (elements) {
+            return {
+                type: Syntax.ArrayExpression,
+                elements: elements
+            };
+        },
+
+        createAssignmentExpression: function (operator, left, right) {
+            return {
+                type: Syntax.AssignmentExpression,
+                operator: operator,
+                left: left,
+                right: right
+            };
+        },
+
+        createBinaryExpression: function (operator, left, right) {
+            var type = (operator === '||' || operator === '&&') ? Syntax.LogicalExpression :
+                        Syntax.BinaryExpression;
+            return {
+                type: type,
+                operator: operator,
+                left: left,
+                right: right
+            };
+        },
+
+        createBlockStatement: function (body) {
+            return {
+                type: Syntax.BlockStatement,
+                body: body
+            };
+        },
+
+        createBreakStatement: function (label) {
+            return {
+                type: Syntax.BreakStatement,
+                label: label
+            };
+        },
+
+        createCallExpression: function (callee, args) {
+            return {
+                type: Syntax.CallExpression,
+                callee: callee,
+                'arguments': args
+            };
+        },
+
+        createCatchClause: function (param, body) {
+            return {
+                type: Syntax.CatchClause,
+                param: param,
+                body: body
+            };
+        },
+
+        createConditionalExpression: function (test, consequent, alternate) {
+            return {
+                type: Syntax.ConditionalExpression,
+                test: test,
+                consequent: consequent,
+                alternate: alternate
+            };
+        },
+
+        createContinueStatement: function (label) {
+            return {
+                type: Syntax.ContinueStatement,
+                label: label
+            };
+        },
+
+        createDebuggerStatement: function () {
+            return {
+                type: Syntax.DebuggerStatement
+            };
+        },
+
+        createDoWhileStatement: function (body, test) {
+            return {
+                type: Syntax.DoWhileStatement,
+                body: body,
+                test: test
+            };
+        },
+
+        createEmptyStatement: function () {
+            return {
+                type: Syntax.EmptyStatement
+            };
+        },
+
+        createExpressionStatement: function (expression) {
+            return {
+                type: Syntax.ExpressionStatement,
+                expression: expression
+            };
+        },
+
+        createForStatement: function (init, test, update, body) {
+            return {
+                type: Syntax.ForStatement,
+                init: init,
+                test: test,
+                update: update,
+                body: body
+            };
+        },
+
+        createForInStatement: function (left, right, body) {
+            return {
+                type: Syntax.ForInStatement,
+                left: left,
+                right: right,
+                body: body,
+                each: false
+            };
+        },
+
+        createFunctionDeclaration: function (id, params, defaults, body) {
+            return {
+                type: Syntax.FunctionDeclaration,
+                id: id,
+                params: params,
+                defaults: defaults,
+                body: body,
+                rest: null,
+                generator: false,
+                expression: false
+            };
+        },
+
+        createFunctionExpression: function (id, params, defaults, body) {
+            return {
+                type: Syntax.FunctionExpression,
+                id: id,
+                params: params,
+                defaults: defaults,
+                body: body,
+                rest: null,
+                generator: false,
+                expression: false
+            };
+        },
+
+        createIdentifier: function (name) {
+            return {
+                type: Syntax.Identifier,
+                name: name
+            };
+        },
+
+        createIfStatement: function (test, consequent, alternate) {
+            return {
+                type: Syntax.IfStatement,
+                test: test,
+                consequent: consequent,
+                alternate: alternate
+            };
+        },
+
+        createLabeledStatement: function (label, body) {
+            return {
+                type: Syntax.LabeledStatement,
+                label: label,
+                body: body
+            };
+        },
+
+        createLiteral: function (token) {
+            return {
+                type: Syntax.Literal,
+                value: token.value,
+                raw: source.slice(token.start, token.end)
+            };
+        },
+
+        createMemberExpression: function (accessor, object, property) {
+            return {
+                type: Syntax.MemberExpression,
+                computed: accessor === '[',
+                object: object,
+                property: property
+            };
+        },
+
+        createNewExpression: function (callee, args) {
+            return {
+                type: Syntax.NewExpression,
+                callee: callee,
+                'arguments': args
+            };
+        },
+
+        createObjectExpression: function (properties) {
+            return {
+                type: Syntax.ObjectExpression,
+                properties: properties
+            };
+        },
+
+        createPostfixExpression: function (operator, argument) {
+            return {
+                type: Syntax.UpdateExpression,
+                operator: operator,
+                argument: argument,
+                prefix: false
+            };
+        },
+
+        createProgram: function (body) {
+            return {
+                type: Syntax.Program,
+                body: body
+            };
+        },
+
+        createProperty: function (kind, key, value) {
+            return {
+                type: Syntax.Property,
+                key: key,
+                value: value,
+                kind: kind
+            };
+        },
+
+        createReturnStatement: function (argument) {
+            return {
+                type: Syntax.ReturnStatement,
+                argument: argument
+            };
+        },
+
+        createSequenceExpression: function (expressions) {
+            return {
+                type: Syntax.SequenceExpression,
+                expressions: expressions
+            };
+        },
+
+        createSwitchCase: function (test, consequent) {
+            return {
+                type: Syntax.SwitchCase,
+                test: test,
+                consequent: consequent
+            };
+        },
+
+        createSwitchStatement: function (discriminant, cases) {
+            return {
+                type: Syntax.SwitchStatement,
+                discriminant: discriminant,
+                cases: cases
+            };
+        },
+
+        createThisExpression: function () {
+            return {
+                type: Syntax.ThisExpression
+            };
+        },
+
+        createThrowStatement: function (argument) {
+            return {
+                type: Syntax.ThrowStatement,
+                argument: argument
+            };
+        },
+
+        createTryStatement: function (block, guardedHandlers, handlers, finalizer) {
+            return {
+                type: Syntax.TryStatement,
+                block: block,
+                guardedHandlers: guardedHandlers,
+                handlers: handlers,
+                finalizer: finalizer
+            };
+        },
+
+        createUnaryExpression: function (operator, argument) {
+            if (operator === '++' || operator === '--') {
+                return {
+                    type: Syntax.UpdateExpression,
+                    operator: operator,
+                    argument: argument,
+                    prefix: true
+                };
+            }
+            return {
+                type: Syntax.UnaryExpression,
+                operator: operator,
+                argument: argument,
+                prefix: true
+            };
+        },
+
+        createVariableDeclaration: function (declarations, kind) {
+            return {
+                type: Syntax.VariableDeclaration,
+                declarations: declarations,
+                kind: kind
+            };
+        },
+
+        createVariableDeclarator: function (id, init) {
+            return {
+                type: Syntax.VariableDeclarator,
+                id: id,
+                init: init
+            };
+        },
+
+        createWhileStatement: function (test, body) {
+            return {
+                type: Syntax.WhileStatement,
+                test: test,
+                body: body
+            };
+        },
+
+        createWithStatement: function (object, body) {
+            return {
+                type: Syntax.WithStatement,
+                object: object,
+                body: body
+            };
+        }
+    };
+
+    // Return true if there is a line terminator before the next token.
+
+    function peekLineTerminator() {
+        var pos, line, start, found;
+
+        pos = index;
+        line = lineNumber;
+        start = lineStart;
+        skipComment();
+        found = lineNumber !== line;
+        index = pos;
+        lineNumber = line;
+        lineStart = start;
+
+        return found;
+    }
+
+    // Throw an exception
+
+    function throwError(token, messageFormat) {
+        var error,
+            args = Array.prototype.slice.call(arguments, 2),
+            msg = messageFormat.replace(
+                /%(\d)/g,
+                function (whole, index) {
+                    assert(index < args.length, 'Message reference must be in range');
+                    return args[index];
+                }
+            );
+
+        if (typeof token.lineNumber === 'number') {
+            error = new Error('Line ' + token.lineNumber + ': ' + msg);
+            error.index = token.start;
+            error.lineNumber = token.lineNumber;
+            error.column = token.start - lineStart + 1;
+        } else {
+            error = new Error('Line ' + lineNumber + ': ' + msg);
+            error.index = index;
+            error.lineNumber = lineNumber;
+            error.column = index - lineStart + 1;
+        }
+
+        error.description = msg;
+        throw error;
+    }
+
+    function throwErrorTolerant() {
+        try {
+            throwError.apply(null, arguments);
+        } catch (e) {
+            if (extra.errors) {
+                extra.errors.push(e);
+            } else {
+                throw e;
+            }
+        }
+    }
+
+
+    // Throw an exception because of the token.
+
+    function throwUnexpected(token) {
+        if (token.type === Token.EOF) {
+            throwError(token, Messages.UnexpectedEOS);
+        }
+
+        if (token.type === Token.NumericLiteral) {
+            throwError(token, Messages.UnexpectedNumber);
+        }
+
+        if (token.type === Token.StringLiteral) {
+            throwError(token, Messages.UnexpectedString);
+        }
+
+        if (token.type === Token.Identifier) {
+            throwError(token, Messages.UnexpectedIdentifier);
+        }
+
+        if (token.type === Token.Keyword) {
+            if (isFutureReservedWord(token.value)) {
+                throwError(token, Messages.UnexpectedReserved);
+            } else if (strict && isStrictModeReservedWord(token.value)) {
+                throwErrorTolerant(token, Messages.StrictReservedWord);
+                return;
+            }
+            throwError(token, Messages.UnexpectedToken, token.value);
+        }
+
+        // BooleanLiteral, NullLiteral, or Punctuator.
+        throwError(token, Messages.UnexpectedToken, token.value);
+    }
+
+    // Expect the next token to match the specified punctuator.
+    // If not, an exception will be thrown.
+
+    function expect(value) {
+        var token = lex();
+        if (token.type !== Token.Punctuator || token.value !== value) {
+            throwUnexpected(token);
+        }
+    }
+
+    // Expect the next token to match the specified keyword.
+    // If not, an exception will be thrown.
+
+    function expectKeyword(keyword) {
+        var token = lex();
+        if (token.type !== Token.Keyword || token.value !== keyword) {
+            throwUnexpected(token);
+        }
+    }
+
+    // Return true if the next token matches the specified punctuator.
+
+    function match(value) {
+        return lookahead.type === Token.Punctuator && lookahead.value === value;
+    }
+
+    // Return true if the next token matches the specified keyword
+
+    function matchKeyword(keyword) {
+        return lookahead.type === Token.Keyword && lookahead.value === keyword;
+    }
+
+    // Return true if the next token is an assignment operator
+
+    function matchAssign() {
+        var op;
+
+        if (lookahead.type !== Token.Punctuator) {
+            return false;
+        }
+        op = lookahead.value;
+        return op === '=' ||
+            op === '*=' ||
+            op === '/=' ||
+            op === '%=' ||
+            op === '+=' ||
+            op === '-=' ||
+            op === '<<=' ||
+            op === '>>=' ||
+            op === '>>>=' ||
+            op === '&=' ||
+            op === '^=' ||
+            op === '|=';
+    }
+
+    function consumeSemicolon() {
+        var line;
+
+        // Catch the very common case first: immediately a semicolon (U+003B).
+        if (source.charCodeAt(index) === 0x3B || match(';')) {
+            lex();
+            return;
+        }
+
+        line = lineNumber;
+        skipComment();
+        if (lineNumber !== line) {
+            return;
+        }
+
+        if (lookahead.type !== Token.EOF && !match('}')) {
+            throwUnexpected(lookahead);
+        }
+    }
+
+    // Return true if provided expression is LeftHandSideExpression
+
+    function isLeftHandSide(expr) {
+        return expr.type === Syntax.Identifier || expr.type === Syntax.MemberExpression;
+    }
+
+    // 11.1.4 Array Initialiser
+
+    function parseArrayInitialiser() {
+        var elements = [], startToken;
+
+        startToken = lookahead;
+        expect('[');
+
+        while (!match(']')) {
+            if (match(',')) {
+                lex();
+                elements.push(null);
+            } else {
+                elements.push(parseAssignmentExpression());
+
+                if (!match(']')) {
+                    expect(',');
+                }
+            }
+        }
+
+        lex();
+
+        return delegate.markEnd(delegate.createArrayExpression(elements), startToken);
+    }
+
+    // 11.1.5 Object Initialiser
+
+    function parsePropertyFunction(param, first) {
+        var previousStrict, body, startToken;
+
+        previousStrict = strict;
+        startToken = lookahead;
+        body = parseFunctionSourceElements();
+        if (first && strict && isRestrictedWord(param[0].name)) {
+            throwErrorTolerant(first, Messages.StrictParamName);
+        }
+        strict = previousStrict;
+        return delegate.markEnd(delegate.createFunctionExpression(null, param, [], body), startToken);
+    }
+
+    function parseObjectPropertyKey() {
+        var token, startToken;
+
+        startToken = lookahead;
+        token = lex();
+
+        // Note: This function is called only from parseObjectProperty(), where
+        // EOF and Punctuator tokens are already filtered out.
+
+        if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) {
+            if (strict && token.octal) {
+                throwErrorTolerant(token, Messages.StrictOctalLiteral);
+            }
+            return delegate.markEnd(delegate.createLiteral(token), startToken);
+        }
+
+        return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
+    }
+
+    function parseObjectProperty() {
+        var token, key, id, value, param, startToken;
+
+        token = lookahead;
+        startToken = lookahead;
+
+        if (token.type === Token.Identifier) {
+
+            id = parseObjectPropertyKey();
+
+            // Property Assignment: Getter and Setter.
+
+            if (token.value === 'get' && !match(':')) {
+                key = parseObjectPropertyKey();
+                expect('(');
+                expect(')');
+                value = parsePropertyFunction([]);
+                return delegate.markEnd(delegate.createProperty('get', key, value), startToken);
+            }
+            if (token.value === 'set' && !match(':')) {
+                key = parseObjectPropertyKey();
+                expect('(');
+                token = lookahead;
+                if (token.type !== Token.Identifier) {
+                    expect(')');
+                    throwErrorTolerant(token, Messages.UnexpectedToken, token.value);
+                    value = parsePropertyFunction([]);
+                } else {
+                    param = [ parseVariableIdentifier() ];
+                    expect(')');
+                    value = parsePropertyFunction(param, token);
+                }
+                return delegate.markEnd(delegate.createProperty('set', key, value), startToken);
+            }
+            expect(':');
+            value = parseAssignmentExpression();
+            return delegate.markEnd(delegate.createProperty('init', id, value), startToken);
+        }
+        if (token.type === Token.EOF || token.type === Token.Punctuator) {
+            throwUnexpected(token);
+        } else {
+            key = parseObjectPropertyKey();
+            expect(':');
+            value = parseAssignmentExpression();
+            return delegate.markEnd(delegate.createProperty('init', key, value), startToken);
+        }
+    }
+
+    function parseObjectInitialiser() {
+        var properties = [], property, name, key, kind, map = {}, toString = String, startToken;
+
+        startToken = lookahead;
+
+        expect('{');
+
+        while (!match('}')) {
+            property = parseObjectProperty();
+
+            if (property.key.type === Syntax.Identifier) {
+                name = property.key.name;
+            } else {
+                name = toString(property.key.value);
+            }
+            kind = (property.kind === 'init') ? PropertyKind.Data : (property.kind === 'get') ? PropertyKind.Get : PropertyKind.Set;
+
+            key = '$' + name;
+            if (Object.prototype.hasOwnProperty.call(map, key)) {
+                if (map[key] === PropertyKind.Data) {
+                    if (strict && kind === PropertyKind.Data) {
+                        throwErrorTolerant({}, Messages.StrictDuplicateProperty);
+                    } else if (kind !== PropertyKind.Data) {
+                        throwErrorTolerant({}, Messages.AccessorDataProperty);
+                    }
+                } else {
+                    if (kind === PropertyKind.Data) {
+                        throwErrorTolerant({}, Messages.AccessorDataProperty);
+                    } else if (map[key] & kind) {
+                        throwErrorTolerant({}, Messages.AccessorGetSet);
+                    }
+                }
+                map[key] |= kind;
+            } else {
+                map[key] = kind;
+            }
+
+            properties.push(property);
+
+            if (!match('}')) {
+                expect(',');
+            }
+        }
+
+        expect('}');
+
+        return delegate.markEnd(delegate.createObjectExpression(properties), startToken);
+    }
+
+    // 11.1.6 The Grouping Operator
+
+    function parseGroupExpression() {
+        var expr;
+
+        expect('(');
+
+        expr = parseExpression();
+
+        expect(')');
+
+        return expr;
+    }
+
+
+    // 11.1 Primary Expressions
+
+    function parsePrimaryExpression() {
+        var type, token, expr, startToken;
+
+        if (match('(')) {
+            return parseGroupExpression();
+        }
+
+        if (match('[')) {
+            return parseArrayInitialiser();
+        }
+
+        if (match('{')) {
+            return parseObjectInitialiser();
+        }
+
+        type = lookahead.type;
+        startToken = lookahead;
+
+        if (type === Token.Identifier) {
+            expr =  delegate.createIdentifier(lex().value);
+        } else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
+            if (strict && lookahead.octal) {
+                throwErrorTolerant(lookahead, Messages.StrictOctalLiteral);
+            }
+            expr = delegate.createLiteral(lex());
+        } else if (type === Token.Keyword) {
+            if (matchKeyword('function')) {
+                return parseFunctionExpression();
+            }
+            if (matchKeyword('this')) {
+                lex();
+                expr = delegate.createThisExpression();
+            } else {
+                throwUnexpected(lex());
+            }
+        } else if (type === Token.BooleanLiteral) {
+            token = lex();
+            token.value = (token.value === 'true');
+            expr = delegate.createLiteral(token);
+        } else if (type === Token.NullLiteral) {
+            token = lex();
+            token.value = null;
+            expr = delegate.createLiteral(token);
+        } else if (match('/') || match('/=')) {
+            if (typeof extra.tokens !== 'undefined') {
+                expr = delegate.createLiteral(collectRegex());
+            } else {
+                expr = delegate.createLiteral(scanRegExp());
+            }
+            peek();
+        } else {
+            throwUnexpected(lex());
+        }
+
+        return delegate.markEnd(expr, startToken);
+    }
+
+    // 11.2 Left-Hand-Side Expressions
+
+    function parseArguments() {
+        var args = [];
+
+        expect('(');
+
+        if (!match(')')) {
+            while (index < length) {
+                args.push(parseAssignmentExpression());
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        return args;
+    }
+
+    function parseNonComputedProperty() {
+        var token, startToken;
+
+        startToken = lookahead;
+        token = lex();
+
+        if (!isIdentifierName(token)) {
+            throwUnexpected(token);
+        }
+
+        return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
+    }
+
+    function parseNonComputedMember() {
+        expect('.');
+
+        return parseNonComputedProperty();
+    }
+
+    function parseComputedMember() {
+        var expr;
+
+        expect('[');
+
+        expr = parseExpression();
+
+        expect(']');
+
+        return expr;
+    }
+
+    function parseNewExpression() {
+        var callee, args, startToken;
+
+        startToken = lookahead;
+        expectKeyword('new');
+        callee = parseLeftHandSideExpression();
+        args = match('(') ? parseArguments() : [];
+
+        return delegate.markEnd(delegate.createNewExpression(callee, args), startToken);
+    }
+
+    function parseLeftHandSideExpressionAllowCall() {
+        var previousAllowIn, expr, args, property, startToken;
+
+        startToken = lookahead;
+
+        previousAllowIn = state.allowIn;
+        state.allowIn = true;
+        expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
+        state.allowIn = previousAllowIn;
+
+        for (;;) {
+            if (match('.')) {
+                property = parseNonComputedMember();
+                expr = delegate.createMemberExpression('.', expr, property);
+            } else if (match('(')) {
+                args = parseArguments();
+                expr = delegate.createCallExpression(expr, args);
+            } else if (match('[')) {
+                property = parseComputedMember();
+                expr = delegate.createMemberExpression('[', expr, property);
+            } else {
+                break;
+            }
+            delegate.markEnd(expr, startToken);
+        }
+
+        return expr;
+    }
+
+    function parseLeftHandSideExpression() {
+        var previousAllowIn, expr, property, startToken;
+
+        startToken = lookahead;
+
+        previousAllowIn = state.allowIn;
+        expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
+        state.allowIn = previousAllowIn;
+
+        while (match('.') || match('[')) {
+            if (match('[')) {
+                property = parseComputedMember();
+                expr = delegate.createMemberExpression('[', expr, property);
+            } else {
+                property = parseNonComputedMember();
+                expr = delegate.createMemberExpression('.', expr, property);
+            }
+            delegate.markEnd(expr, startToken);
+        }
+
+        return expr;
+    }
+
+    // 11.3 Postfix Expressions
+
+    function parsePostfixExpression() {
+        var expr, token, startToken = lookahead;
+
+        expr = parseLeftHandSideExpressionAllowCall();
+
+        if (lookahead.type === Token.Punctuator) {
+            if ((match('++') || match('--')) && !peekLineTerminator()) {
+                // 11.3.1, 11.3.2
+                if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
+                    throwErrorTolerant({}, Messages.StrictLHSPostfix);
+                }
+
+                if (!isLeftHandSide(expr)) {
+                    throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
+                }
+
+                token = lex();
+                expr = delegate.markEnd(delegate.createPostfixExpression(token.value, expr), startToken);
+            }
+        }
+
+        return expr;
+    }
+
+    // 11.4 Unary Operators
+
+    function parseUnaryExpression() {
+        var token, expr, startToken;
+
+        if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
+            expr = parsePostfixExpression();
+        } else if (match('++') || match('--')) {
+            startToken = lookahead;
+            token = lex();
+            expr = parseUnaryExpression();
+            // 11.4.4, 11.4.5
+            if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
+                throwErrorTolerant({}, Messages.StrictLHSPrefix);
+            }
+
+            if (!isLeftHandSide(expr)) {
+                throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
+            }
+
+            expr = delegate.createUnaryExpression(token.value, expr);
+            expr = delegate.markEnd(expr, startToken);
+        } else if (match('+') || match('-') || match('~') || match('!')) {
+            startToken = lookahead;
+            token = lex();
+            expr = parseUnaryExpression();
+            expr = delegate.createUnaryExpression(token.value, expr);
+            expr = delegate.markEnd(expr, startToken);
+        } else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
+            startToken = lookahead;
+            token = lex();
+            expr = parseUnaryExpression();
+            expr = delegate.createUnaryExpression(token.value, expr);
+            expr = delegate.markEnd(expr, startToken);
+            if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
+                throwErrorTolerant({}, Messages.StrictDelete);
+            }
+        } else {
+            expr = parsePostfixExpression();
+        }
+
+        return expr;
+    }
+
+    function binaryPrecedence(token, allowIn) {
+        var prec = 0;
+
+        if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
+            return 0;
+        }
+
+        switch (token.value) {
+        case '||':
+            prec = 1;
+            break;
+
+        case '&&':
+            prec = 2;
+            break;
+
+        case '|':
+            prec = 3;
+            break;
+
+        case '^':
+            prec = 4;
+            break;
+
+        case '&':
+            prec = 5;
+            break;
+
+        case '==':
+        case '!=':
+        case '===':
+        case '!==':
+            prec = 6;
+            break;
+
+        case '<':
+        case '>':
+        case '<=':
+        case '>=':
+        case 'instanceof':
+            prec = 7;
+            break;
+
+        case 'in':
+            prec = allowIn ? 7 : 0;
+            break;
+
+        case '<<':
+        case '>>':
+        case '>>>':
+            prec = 8;
+            break;
+
+        case '+':
+        case '-':
+            prec = 9;
+            break;
+
+        case '*':
+        case '/':
+        case '%':
+            prec = 11;
+            break;
+
+        default:
+            break;
+        }
+
+        return prec;
+    }
+
+    // 11.5 Multiplicative Operators
+    // 11.6 Additive Operators
+    // 11.7 Bitwise Shift Operators
+    // 11.8 Relational Operators
+    // 11.9 Equality Operators
+    // 11.10 Binary Bitwise Operators
+    // 11.11 Binary Logical Operators
+
+    function parseBinaryExpression() {
+        var marker, markers, expr, token, prec, stack, right, operator, left, i;
+
+        marker = lookahead;
+        left = parseUnaryExpression();
+
+        token = lookahead;
+        prec = binaryPrecedence(token, state.allowIn);
+        if (prec === 0) {
+            return left;
+        }
+        token.prec = prec;
+        lex();
+
+        markers = [marker, lookahead];
+        right = parseUnaryExpression();
+
+        stack = [left, token, right];
+
+        while ((prec = binaryPrecedence(lookahead, state.allowIn)) > 0) {
+
+            // Reduce: make a binary expression from the three topmost entries.
+            while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
+                right = stack.pop();
+                operator = stack.pop().value;
+                left = stack.pop();
+                expr = delegate.createBinaryExpression(operator, left, right);
+                markers.pop();
+                marker = markers[markers.length - 1];
+                delegate.markEnd(expr, marker);
+                stack.push(expr);
+            }
+
+            // Shift.
+            token = lex();
+            token.prec = prec;
+            stack.push(token);
+            markers.push(lookahead);
+            expr = parseUnaryExpression();
+            stack.push(expr);
+        }
+
+        // Final reduce to clean-up the stack.
+        i = stack.length - 1;
+        expr = stack[i];
+        markers.pop();
+        while (i > 1) {
+            expr = delegate.createBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
+            i -= 2;
+            marker = markers.pop();
+            delegate.markEnd(expr, marker);
+        }
+
+        return expr;
+    }
+
+
+    // 11.12 Conditional Operator
+
+    function parseConditionalExpression() {
+        var expr, previousAllowIn, consequent, alternate, startToken;
+
+        startToken = lookahead;
+
+        expr = parseBinaryExpression();
+
+        if (match('?')) {
+            lex();
+            previousAllowIn = state.allowIn;
+            state.allowIn = true;
+            consequent = parseAssignmentExpression();
+            state.allowIn = previousAllowIn;
+            expect(':');
+            alternate = parseAssignmentExpression();
+
+            expr = delegate.createConditionalExpression(expr, consequent, alternate);
+            delegate.markEnd(expr, startToken);
+        }
+
+        return expr;
+    }
+
+    // 11.13 Assignment Operators
+
+    function parseAssignmentExpression() {
+        var token, left, right, node, startToken;
+
+        token = lookahead;
+        startToken = lookahead;
+
+        node = left = parseConditionalExpression();
+
+        if (matchAssign()) {
+            // LeftHandSideExpression
+            if (!isLeftHandSide(left)) {
+                throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
+            }
+
+            // 11.13.1
+            if (strict && left.type === Syntax.Identifier && isRestrictedWord(left.name)) {
+                throwErrorTolerant(token, Messages.StrictLHSAssignment);
+            }
+
+            token = lex();
+            right = parseAssignmentExpression();
+            node = delegate.markEnd(delegate.createAssignmentExpression(token.value, left, right), startToken);
+        }
+
+        return node;
+    }
+
+    // 11.14 Comma Operator
+
+    function parseExpression() {
+        var expr, startToken = lookahead;
+
+        expr = parseAssignmentExpression();
+
+        if (match(',')) {
+            expr = delegate.createSequenceExpression([ expr ]);
+
+            while (index < length) {
+                if (!match(',')) {
+                    break;
+                }
+                lex();
+                expr.expressions.push(parseAssignmentExpression());
+            }
+
+            delegate.markEnd(expr, startToken);
+        }
+
+        return expr;
+    }
+
+    // 12.1 Block
+
+    function parseStatementList() {
+        var list = [],
+            statement;
+
+        while (index < length) {
+            if (match('}')) {
+                break;
+            }
+            statement = parseSourceElement();
+            if (typeof statement === 'undefined') {
+                break;
+            }
+            list.push(statement);
+        }
+
+        return list;
+    }
+
+    function parseBlock() {
+        var block, startToken;
+
+        startToken = lookahead;
+        expect('{');
+
+        block = parseStatementList();
+
+        expect('}');
+
+        return delegate.markEnd(delegate.createBlockStatement(block), startToken);
+    }
+
+    // 12.2 Variable Statement
+
+    function parseVariableIdentifier() {
+        var token, startToken;
+
+        startToken = lookahead;
+        token = lex();
+
+        if (token.type !== Token.Identifier) {
+            throwUnexpected(token);
+        }
+
+        return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
+    }
+
+    function parseVariableDeclaration(kind) {
+        var init = null, id, startToken;
+
+        startToken = lookahead;
+        id = parseVariableIdentifier();
+
+        // 12.2.1
+        if (strict && isRestrictedWord(id.name)) {
+            throwErrorTolerant({}, Messages.StrictVarName);
+        }
+
+        if (kind === 'const') {
+            expect('=');
+            init = parseAssignmentExpression();
+        } else if (match('=')) {
+            lex();
+            init = parseAssignmentExpression();
+        }
+
+        return delegate.markEnd(delegate.createVariableDeclarator(id, init), startToken);
+    }
+
+    function parseVariableDeclarationList(kind) {
+        var list = [];
+
+        do {
+            list.push(parseVariableDeclaration(kind));
+            if (!match(',')) {
+                break;
+            }
+            lex();
+        } while (index < length);
+
+        return list;
+    }
+
+    function parseVariableStatement() {
+        var declarations;
+
+        expectKeyword('var');
+
+        declarations = parseVariableDeclarationList();
+
+        consumeSemicolon();
+
+        return delegate.createVariableDeclaration(declarations, 'var');
+    }
+
+    // kind may be `const` or `let`
+    // Both are experimental and not in the specification yet.
+    // see http://wiki.ecmascript.org/doku.php?id=harmony:const
+    // and http://wiki.ecmascript.org/doku.php?id=harmony:let
+    function parseConstLetDeclaration(kind) {
+        var declarations, startToken;
+
+        startToken = lookahead;
+
+        expectKeyword(kind);
+
+        declarations = parseVariableDeclarationList(kind);
+
+        consumeSemicolon();
+
+        return delegate.markEnd(delegate.createVariableDeclaration(declarations, kind), startToken);
+    }
+
+    // 12.3 Empty Statement
+
+    function parseEmptyStatement() {
+        expect(';');
+        return delegate.createEmptyStatement();
+    }
+
+    // 12.4 Expression Statement
+
+    function parseExpressionStatement() {
+        var expr = parseExpression();
+        consumeSemicolon();
+        return delegate.createExpressionStatement(expr);
+    }
+
+    // 12.5 If statement
+
+    function parseIfStatement() {
+        var test, consequent, alternate;
+
+        expectKeyword('if');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        consequent = parseStatement();
+
+        if (matchKeyword('else')) {
+            lex();
+            alternate = parseStatement();
+        } else {
+            alternate = null;
+        }
+
+        return delegate.createIfStatement(test, consequent, alternate);
+    }
+
+    // 12.6 Iteration Statements
+
+    function parseDoWhileStatement() {
+        var body, test, oldInIteration;
+
+        expectKeyword('do');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = parseStatement();
+
+        state.inIteration = oldInIteration;
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        if (match(';')) {
+            lex();
+        }
+
+        return delegate.createDoWhileStatement(body, test);
+    }
+
+    function parseWhileStatement() {
+        var test, body, oldInIteration;
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = parseStatement();
+
+        state.inIteration = oldInIteration;
+
+        return delegate.createWhileStatement(test, body);
+    }
+
+    function parseForVariableDeclaration() {
+        var token, declarations, startToken;
+
+        startToken = lookahead;
+        token = lex();
+        declarations = parseVariableDeclarationList();
+
+        return delegate.markEnd(delegate.createVariableDeclaration(declarations, token.value), startToken);
+    }
+
+    function parseForStatement() {
+        var init, test, update, left, right, body, oldInIteration;
+
+        init = test = update = null;
+
+        expectKeyword('for');
+
+        expect('(');
+
+        if (match(';')) {
+            lex();
+        } else {
+            if (matchKeyword('var') || matchKeyword('let')) {
+                state.allowIn = false;
+                init = parseForVariableDeclaration();
+                state.allowIn = true;
+
+                if (init.declarations.length === 1 && matchKeyword('in')) {
+                    lex();
+                    left = init;
+                    right = parseExpression();
+                    init = null;
+                }
+            } else {
+                state.allowIn = false;
+                init = parseExpression();
+                state.allowIn = true;
+
+                if (matchKeyword('in')) {
+                    // LeftHandSideExpression
+                    if (!isLeftHandSide(init)) {
+                        throwErrorTolerant({}, Messages.InvalidLHSInForIn);
+                    }
+
+                    lex();
+                    left = init;
+                    right = parseExpression();
+                    init = null;
+                }
+            }
+
+            if (typeof left === 'undefined') {
+                expect(';');
+            }
+        }
+
+        if (typeof left === 'undefined') {
+
+            if (!match(';')) {
+                test = parseExpression();
+            }
+            expect(';');
+
+            if (!match(')')) {
+                update = parseExpression();
+            }
+        }
+
+        expect(')');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = parseStatement();
+
+        state.inIteration = oldInIteration;
+
+        return (typeof left === 'undefined') ?
+                delegate.createForStatement(init, test, update, body) :
+                delegate.createForInStatement(left, right, body);
+    }
+
+    // 12.7 The continue statement
+
+    function parseContinueStatement() {
+        var label = null, key;
+
+        expectKeyword('continue');
+
+        // Optimize the most common form: 'continue;'.
+        if (source.charCodeAt(index) === 0x3B) {
+            lex();
+
+            if (!state.inIteration) {
+                throwError({}, Messages.IllegalContinue);
+            }
+
+            return delegate.createContinueStatement(null);
+        }
+
+        if (peekLineTerminator()) {
+            if (!state.inIteration) {
+                throwError({}, Messages.IllegalContinue);
+            }
+
+            return delegate.createContinueStatement(null);
+        }
+
+        if (lookahead.type === Token.Identifier) {
+            label = parseVariableIdentifier();
+
+            key = '$' + label.name;
+            if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError({}, Messages.UnknownLabel, label.name);
+            }
+        }
+
+        consumeSemicolon();
+
+        if (label === null && !state.inIteration) {
+            throwError({}, Messages.IllegalContinue);
+        }
+
+        return delegate.createContinueStatement(label);
+    }
+
+    // 12.8 The break statement
+
+    function parseBreakStatement() {
+        var label = null, key;
+
+        expectKeyword('break');
+
+        // Catch the very common case first: immediately a semicolon (U+003B).
+        if (source.charCodeAt(index) === 0x3B) {
+            lex();
+
+            if (!(state.inIteration || state.inSwitch)) {
+                throwError({}, Messages.IllegalBreak);
+            }
+
+            return delegate.createBreakStatement(null);
+        }
+
+        if (peekLineTerminator()) {
+            if (!(state.inIteration || state.inSwitch)) {
+                throwError({}, Messages.IllegalBreak);
+            }
+
+            return delegate.createBreakStatement(null);
+        }
+
+        if (lookahead.type === Token.Identifier) {
+            label = parseVariableIdentifier();
+
+            key = '$' + label.name;
+            if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError({}, Messages.UnknownLabel, label.name);
+            }
+        }
+
+        consumeSemicolon();
+
+        if (label === null && !(state.inIteration || state.inSwitch)) {
+            throwError({}, Messages.IllegalBreak);
+        }
+
+        return delegate.createBreakStatement(label);
+    }
+
+    // 12.9 The return statement
+
+    function parseReturnStatement() {
+        var argument = null;
+
+        expectKeyword('return');
+
+        if (!state.inFunctionBody) {
+            throwErrorTolerant({}, Messages.IllegalReturn);
+        }
+
+        // 'return' followed by a space and an identifier is very common.
+        if (source.charCodeAt(index) === 0x20) {
+            if (isIdentifierStart(source.charCodeAt(index + 1))) {
+                argument = parseExpression();
+                consumeSemicolon();
+                return delegate.createReturnStatement(argument);
+            }
+        }
+
+        if (peekLineTerminator()) {
+            return delegate.createReturnStatement(null);
+        }
+
+        if (!match(';')) {
+            if (!match('}') && lookahead.type !== Token.EOF) {
+                argument = parseExpression();
+            }
+        }
+
+        consumeSemicolon();
+
+        return delegate.createReturnStatement(argument);
+    }
+
+    // 12.10 The with statement
+
+    function parseWithStatement() {
+        var object, body;
+
+        if (strict) {
+            // TODO(ikarienator): Should we update the test cases instead?
+            skipComment();
+            throwErrorTolerant({}, Messages.StrictModeWith);
+        }
+
+        expectKeyword('with');
+
+        expect('(');
+
+        object = parseExpression();
+
+        expect(')');
+
+        body = parseStatement();
+
+        return delegate.createWithStatement(object, body);
+    }
+
+    // 12.10 The swith statement
+
+    function parseSwitchCase() {
+        var test, consequent = [], statement, startToken;
+
+        startToken = lookahead;
+        if (matchKeyword('default')) {
+            lex();
+            test = null;
+        } else {
+            expectKeyword('case');
+            test = parseExpression();
+        }
+        expect(':');
+
+        while (index < length) {
+            if (match('}') || matchKeyword('default') || matchKeyword('case')) {
+                break;
+            }
+            statement = parseStatement();
+            consequent.push(statement);
+        }
+
+        return delegate.markEnd(delegate.createSwitchCase(test, consequent), startToken);
+    }
+
+    function parseSwitchStatement() {
+        var discriminant, cases, clause, oldInSwitch, defaultFound;
+
+        expectKeyword('switch');
+
+        expect('(');
+
+        discriminant = parseExpression();
+
+        expect(')');
+
+        expect('{');
+
+        cases = [];
+
+        if (match('}')) {
+            lex();
+            return delegate.createSwitchStatement(discriminant, cases);
+        }
+
+        oldInSwitch = state.inSwitch;
+        state.inSwitch = true;
+        defaultFound = false;
+
+        while (index < length) {
+            if (match('}')) {
+                break;
+            }
+            clause = parseSwitchCase();
+            if (clause.test === null) {
+                if (defaultFound) {
+                    throwError({}, Messages.MultipleDefaultsInSwitch);
+                }
+                defaultFound = true;
+            }
+            cases.push(clause);
+        }
+
+        state.inSwitch = oldInSwitch;
+
+        expect('}');
+
+        return delegate.createSwitchStatement(discriminant, cases);
+    }
+
+    // 12.13 The throw statement
+
+    function parseThrowStatement() {
+        var argument;
+
+        expectKeyword('throw');
+
+        if (peekLineTerminator()) {
+            throwError({}, Messages.NewlineAfterThrow);
+        }
+
+        argument = parseExpression();
+
+        consumeSemicolon();
+
+        return delegate.createThrowStatement(argument);
+    }
+
+    // 12.14 The try statement
+
+    function parseCatchClause() {
+        var param, body, startToken;
+
+        startToken = lookahead;
+        expectKeyword('catch');
+
+        expect('(');
+        if (match(')')) {
+            throwUnexpected(lookahead);
+        }
+
+        param = parseVariableIdentifier();
+        // 12.14.1
+        if (strict && isRestrictedWord(param.name)) {
+            throwErrorTolerant({}, Messages.StrictCatchVariable);
+        }
+
+        expect(')');
+        body = parseBlock();
+        return delegate.markEnd(delegate.createCatchClause(param, body), startToken);
+    }
+
+    function parseTryStatement() {
+        var block, handlers = [], finalizer = null;
+
+        expectKeyword('try');
+
+        block = parseBlock();
+
+        if (matchKeyword('catch')) {
+            handlers.push(parseCatchClause());
+        }
+
+        if (matchKeyword('finally')) {
+            lex();
+            finalizer = parseBlock();
+        }
+
+        if (handlers.length === 0 && !finalizer) {
+            throwError({}, Messages.NoCatchOrFinally);
+        }
+
+        return delegate.createTryStatement(block, [], handlers, finalizer);
+    }
+
+    // 12.15 The debugger statement
+
+    function parseDebuggerStatement() {
+        expectKeyword('debugger');
+
+        consumeSemicolon();
+
+        return delegate.createDebuggerStatement();
+    }
+
+    // 12 Statements
+
+    function parseStatement() {
+        var type = lookahead.type,
+            expr,
+            labeledBody,
+            key,
+            startToken;
+
+        if (type === Token.EOF) {
+            throwUnexpected(lookahead);
+        }
+
+        if (type === Token.Punctuator && lookahead.value === '{') {
+            return parseBlock();
+        }
+
+        startToken = lookahead;
+
+        if (type === Token.Punctuator) {
+            switch (lookahead.value) {
+            case ';':
+                return delegate.markEnd(parseEmptyStatement(), startToken);
+            case '(':
+                return delegate.markEnd(parseExpressionStatement(), startToken);
+            default:
+                break;
+            }
+        }
+
+        if (type === Token.Keyword) {
+            switch (lookahead.value) {
+            case 'break':
+                return delegate.markEnd(parseBreakStatement(), startToken);
+            case 'continue':
+                return delegate.markEnd(parseContinueStatement(), startToken);
+            case 'debugger':
+                return delegate.markEnd(parseDebuggerStatement(), startToken);
+            case 'do':
+                return delegate.markEnd(parseDoWhileStatement(), startToken);
+            case 'for':
+                return delegate.markEnd(parseForStatement(), startToken);
+            case 'function':
+                return delegate.markEnd(parseFunctionDeclaration(), startToken);
+            case 'if':
+                return delegate.markEnd(parseIfStatement(), startToken);
+            case 'return':
+                return delegate.markEnd(parseReturnStatement(), startToken);
+            case 'switch':
+                return delegate.markEnd(parseSwitchStatement(), startToken);
+            case 'throw':
+                return delegate.markEnd(parseThrowStatement(), startToken);
+            case 'try':
+                return delegate.markEnd(parseTryStatement(), startToken);
+            case 'var':
+                return delegate.markEnd(parseVariableStatement(), startToken);
+            case 'while':
+                return delegate.markEnd(parseWhileStatement(), startToken);
+            case 'with':
+                return delegate.markEnd(parseWithStatement(), startToken);
+            default:
+                break;
+            }
+        }
+
+        expr = parseExpression();
+
+        // 12.12 Labelled Statements
+        if ((expr.type === Syntax.Identifier) && match(':')) {
+            lex();
+
+            key = '$' + expr.name;
+            if (Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError({}, Messages.Redeclaration, 'Label', expr.name);
+            }
+
+            state.labelSet[key] = true;
+            labeledBody = parseStatement();
+            delete state.labelSet[key];
+            return delegate.markEnd(delegate.createLabeledStatement(expr, labeledBody), startToken);
+        }
+
+        consumeSemicolon();
+
+        return delegate.markEnd(delegate.createExpressionStatement(expr), startToken);
+    }
+
+    // 13 Function Definition
+
+    function parseFunctionSourceElements() {
+        var sourceElement, sourceElements = [], token, directive, firstRestricted,
+            oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody, startToken;
+
+        startToken = lookahead;
+        expect('{');
+
+        while (index < length) {
+            if (lookahead.type !== Token.StringLiteral) {
+                break;
+            }
+            token = lookahead;
+
+            sourceElement = parseSourceElement();
+            sourceElements.push(sourceElement);
+            if (sourceElement.expression.type !== Syntax.Literal) {
+                // this is not directive
+                break;
+            }
+            directive = source.slice(token.start + 1, token.end - 1);
+            if (directive === 'use strict') {
+                strict = true;
+                if (firstRestricted) {
+                    throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
+                }
+            } else {
+                if (!firstRestricted && token.octal) {
+                    firstRestricted = token;
+                }
+            }
+        }
+
+        oldLabelSet = state.labelSet;
+        oldInIteration = state.inIteration;
+        oldInSwitch = state.inSwitch;
+        oldInFunctionBody = state.inFunctionBody;
+
+        state.labelSet = {};
+        state.inIteration = false;
+        state.inSwitch = false;
+        state.inFunctionBody = true;
+
+        while (index < length) {
+            if (match('}')) {
+                break;
+            }
+            sourceElement = parseSourceElement();
+            if (typeof sourceElement === 'undefined') {
+                break;
+            }
+            sourceElements.push(sourceElement);
+        }
+
+        expect('}');
+
+        state.labelSet = oldLabelSet;
+        state.inIteration = oldInIteration;
+        state.inSwitch = oldInSwitch;
+        state.inFunctionBody = oldInFunctionBody;
+
+        return delegate.markEnd(delegate.createBlockStatement(sourceElements), startToken);
+    }
+
+    function parseParams(firstRestricted) {
+        var param, params = [], token, stricted, paramSet, key, message;
+        expect('(');
+
+        if (!match(')')) {
+            paramSet = {};
+            while (index < length) {
+                token = lookahead;
+                param = parseVariableIdentifier();
+                key = '$' + token.value;
+                if (strict) {
+                    if (isRestrictedWord(token.value)) {
+                        stricted = token;
+                        message = Messages.StrictParamName;
+                    }
+                    if (Object.prototype.hasOwnProperty.call(paramSet, key)) {
+                        stricted = token;
+                        message = Messages.StrictParamDupe;
+                    }
+                } else if (!firstRestricted) {
+                    if (isRestrictedWord(token.value)) {
+                        firstRestricted = token;
+                        message = Messages.StrictParamName;
+                    } else if (isStrictModeReservedWord(token.value)) {
+                        firstRestricted = token;
+                        message = Messages.StrictReservedWord;
+                    } else if (Object.prototype.hasOwnProperty.call(paramSet, key)) {
+                        firstRestricted = token;
+                        message = Messages.StrictParamDupe;
+                    }
+                }
+                params.push(param);
+                paramSet[key] = true;
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        return {
+            params: params,
+            stricted: stricted,
+            firstRestricted: firstRestricted,
+            message: message
+        };
+    }
+
+    function parseFunctionDeclaration() {
+        var id, params = [], body, token, stricted, tmp, firstRestricted, message, previousStrict, startToken;
+
+        startToken = lookahead;
+
+        expectKeyword('function');
+        token = lookahead;
+        id = parseVariableIdentifier();
+        if (strict) {
+            if (isRestrictedWord(token.value)) {
+                throwErrorTolerant(token, Messages.StrictFunctionName);
+            }
+        } else {
+            if (isRestrictedWord(token.value)) {
+                firstRestricted = token;
+                message = Messages.StrictFunctionName;
+            } else if (isStrictModeReservedWord(token.value)) {
+                firstRestricted = token;
+                message = Messages.StrictReservedWord;
+            }
+        }
+
+        tmp = parseParams(firstRestricted);
+        params = tmp.params;
+        stricted = tmp.stricted;
+        firstRestricted = tmp.firstRestricted;
+        if (tmp.message) {
+            message = tmp.message;
+        }
+
+        previousStrict = strict;
+        body = parseFunctionSourceElements();
+        if (strict && firstRestricted) {
+            throwError(firstRestricted, message);
+        }
+        if (strict && stricted) {
+            throwErrorTolerant(stricted, message);
+        }
+        strict = previousStrict;
+
+        return delegate.markEnd(delegate.createFunctionDeclaration(id, params, [], body), startToken);
+    }
+
+    function parseFunctionExpression() {
+        var token, id = null, stricted, firstRestricted, message, tmp, params = [], body, previousStrict, startToken;
+
+        startToken = lookahead;
+        expectKeyword('function');
+
+        if (!match('(')) {
+            token = lookahead;
+            id = parseVariableIdentifier();
+            if (strict) {
+                if (isRestrictedWord(token.value)) {
+                    throwErrorTolerant(token, Messages.StrictFunctionName);
+                }
+            } else {
+                if (isRestrictedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictFunctionName;
+                } else if (isStrictModeReservedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictReservedWord;
+                }
+            }
+        }
+
+        tmp = parseParams(firstRestricted);
+        params = tmp.params;
+        stricted = tmp.stricted;
+        firstRestricted = tmp.firstRestricted;
+        if (tmp.message) {
+            message = tmp.message;
+        }
+
+        previousStrict = strict;
+        body = parseFunctionSourceElements();
+        if (strict && firstRestricted) {
+            throwError(firstRestricted, message);
+        }
+        if (strict && stricted) {
+            throwErrorTolerant(stricted, message);
+        }
+        strict = previousStrict;
+
+        return delegate.markEnd(delegate.createFunctionExpression(id, params, [], body), startToken);
+    }
+
+    // 14 Program
+
+    function parseSourceElement() {
+        if (lookahead.type === Token.Keyword) {
+            switch (lookahead.value) {
+            case 'const':
+            case 'let':
+                return parseConstLetDeclaration(lookahead.value);
+            case 'function':
+                return parseFunctionDeclaration();
+            default:
+                return parseStatement();
+            }
+        }
+
+        if (lookahead.type !== Token.EOF) {
+            return parseStatement();
+        }
+    }
+
+    function parseSourceElements() {
+        var sourceElement, sourceElements = [], token, directive, firstRestricted;
+
+        while (index < length) {
+            token = lookahead;
+            if (token.type !== Token.StringLiteral) {
+                break;
+            }
+
+            sourceElement = parseSourceElement();
+            sourceElements.push(sourceElement);
+            if (sourceElement.expression.type !== Syntax.Literal) {
+                // this is not directive
+                break;
+            }
+            directive = source.slice(token.start + 1, token.end - 1);
+            if (directive === 'use strict') {
+                strict = true;
+                if (firstRestricted) {
+                    throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
+                }
+            } else {
+                if (!firstRestricted && token.octal) {
+                    firstRestricted = token;
+                }
+            }
+        }
+
+        while (index < length) {
+            sourceElement = parseSourceElement();
+            /* istanbul ignore if */
+            if (typeof sourceElement === 'undefined') {
+                break;
+            }
+            sourceElements.push(sourceElement);
+        }
+        return sourceElements;
+    }
+
+    function parseProgram() {
+        var body, startToken;
+
+        skipComment();
+        peek();
+        startToken = lookahead;
+        strict = false;
+
+        body = parseSourceElements();
+        return delegate.markEnd(delegate.createProgram(body), startToken);
+    }
+
+    function filterTokenLocation() {
+        var i, entry, token, tokens = [];
+
+        for (i = 0; i < extra.tokens.length; ++i) {
+            entry = extra.tokens[i];
+            token = {
+                type: entry.type,
+                value: entry.value
+            };
+            if (extra.range) {
+                token.range = entry.range;
+            }
+            if (extra.loc) {
+                token.loc = entry.loc;
+            }
+            tokens.push(token);
+        }
+
+        extra.tokens = tokens;
+    }
+
+    function tokenize(code, options) {
+        var toString,
+            token,
+            tokens;
+
+        toString = String;
+        if (typeof code !== 'string' && !(code instanceof String)) {
+            code = toString(code);
+        }
+
+        delegate = SyntaxTreeDelegate;
+        source = code;
+        index = 0;
+        lineNumber = (source.length > 0) ? 1 : 0;
+        lineStart = 0;
+        length = source.length;
+        lookahead = null;
+        state = {
+            allowIn: true,
+            labelSet: {},
+            inFunctionBody: false,
+            inIteration: false,
+            inSwitch: false,
+            lastCommentStart: -1
+        };
+
+        extra = {};
+
+        // Options matching.
+        options = options || {};
+
+        // Of course we collect tokens here.
+        options.tokens = true;
+        extra.tokens = [];
+        extra.tokenize = true;
+        // The following two fields are necessary to compute the Regex tokens.
+        extra.openParenToken = -1;
+        extra.openCurlyToken = -1;
+
+        extra.range = (typeof options.range === 'boolean') && options.range;
+        extra.loc = (typeof options.loc === 'boolean') && options.loc;
+
+        if (typeof options.comment === 'boolean' && options.comment) {
+            extra.comments = [];
+        }
+        if (typeof options.tolerant === 'boolean' && options.tolerant) {
+            extra.errors = [];
+        }
+
+        try {
+            peek();
+            if (lookahead.type === Token.EOF) {
+                return extra.tokens;
+            }
+
+            token = lex();
+            while (lookahead.type !== Token.EOF) {
+                try {
+                    token = lex();
+                } catch (lexError) {
+                    token = lookahead;
+                    if (extra.errors) {
+                        extra.errors.push(lexError);
+                        // We have to break on the first error
+                        // to avoid infinite loops.
+                        break;
+                    } else {
+                        throw lexError;
+                    }
+                }
+            }
+
+            filterTokenLocation();
+            tokens = extra.tokens;
+            if (typeof extra.comments !== 'undefined') {
+                tokens.comments = extra.comments;
+            }
+            if (typeof extra.errors !== 'undefined') {
+                tokens.errors = extra.errors;
+            }
+        } catch (e) {
+            throw e;
+        } finally {
+            extra = {};
+        }
+        return tokens;
+    }
+
+    function parse(code, options) {
+        var program, toString;
+
+        toString = String;
+        if (typeof code !== 'string' && !(code instanceof String)) {
+            code = toString(code);
+        }
+
+        delegate = SyntaxTreeDelegate;
+        source = code;
+        index = 0;
+        lineNumber = (source.length > 0) ? 1 : 0;
+        lineStart = 0;
+        length = source.length;
+        lookahead = null;
+        state = {
+            allowIn: true,
+            labelSet: {},
+            inFunctionBody: false,
+            inIteration: false,
+            inSwitch: false,
+            lastCommentStart: -1
+        };
+
+        extra = {};
+        if (typeof options !== 'undefined') {
+            extra.range = (typeof options.range === 'boolean') && options.range;
+            extra.loc = (typeof options.loc === 'boolean') && options.loc;
+            extra.attachComment = (typeof options.attachComment === 'boolean') && options.attachComment;
+
+            if (extra.loc && options.source !== null && options.source !== undefined) {
+                extra.source = toString(options.source);
+            }
+
+            if (typeof options.tokens === 'boolean' && options.tokens) {
+                extra.tokens = [];
+            }
+            if (typeof options.comment === 'boolean' && options.comment) {
+                extra.comments = [];
+            }
+            if (typeof options.tolerant === 'boolean' && options.tolerant) {
+                extra.errors = [];
+            }
+            if (extra.attachComment) {
+                extra.range = true;
+                extra.comments = [];
+                extra.bottomRightStack = [];
+                extra.trailingComments = [];
+                extra.leadingComments = [];
+            }
+        }
+
+        try {
+            program = parseProgram();
+            if (typeof extra.comments !== 'undefined') {
+                program.comments = extra.comments;
+            }
+            if (typeof extra.tokens !== 'undefined') {
+                filterTokenLocation();
+                program.tokens = extra.tokens;
+            }
+            if (typeof extra.errors !== 'undefined') {
+                program.errors = extra.errors;
+            }
+        } catch (e) {
+            throw e;
+        } finally {
+            extra = {};
+        }
+
+        return program;
+    }
+
+    // Sync with *.json manifests.
+    exports.version = '1.2.2';
+
+    exports.tokenize = tokenize;
+
+    exports.parse = parse;
+
+    // Deep copy.
+   /* istanbul ignore next */
+    exports.Syntax = (function () {
+        var name, types = {};
+
+        if (typeof Object.create === 'function') {
+            types = Object.create(null);
+        }
+
+        for (name in Syntax) {
+            if (Syntax.hasOwnProperty(name)) {
+                types[name] = Syntax[name];
+            }
+        }
+
+        if (typeof Object.freeze === 'function') {
+            Object.freeze(types);
+        }
+
+        return types;
+    }());
+
+}));
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/packages/context-coloring/languages/javascript/libraries/estraverse.js b/packages/context-coloring/languages/javascript/libraries/estraverse.js
new file mode 100644
index 0000000..4009cb0
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/libraries/estraverse.js
@@ -0,0 +1,838 @@
+/*
+  Copyright (C) 2012-2013 Yusuke Suzuki <address@hidden>
+  Copyright (C) 2012 Ariya Hidayat <address@hidden>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*jslint vars:false, bitwise:true*/
+/*jshint indent:4*/
+/*global exports:true, define:true*/
+(function (root, factory) {
+    'use strict';
+
+    // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
+    // and plain browser loading,
+    if (typeof define === 'function' && define.amd) {
+        define(['exports'], factory);
+    } else if (typeof exports !== 'undefined') {
+        factory(exports);
+    } else {
+        factory((root.estraverse = {}));
+    }
+}(this, function (exports) {
+    'use strict';
+
+    var Syntax,
+        isArray,
+        VisitorOption,
+        VisitorKeys,
+        objectCreate,
+        objectKeys,
+        BREAK,
+        SKIP,
+        REMOVE;
+
+    function ignoreJSHintError() { }
+
+    isArray = Array.isArray;
+    if (!isArray) {
+        isArray = function isArray(array) {
+            return Object.prototype.toString.call(array) === '[object Array]';
+        };
+    }
+
+    function deepCopy(obj) {
+        var ret = {}, key, val;
+        for (key in obj) {
+            if (obj.hasOwnProperty(key)) {
+                val = obj[key];
+                if (typeof val === 'object' && val !== null) {
+                    ret[key] = deepCopy(val);
+                } else {
+                    ret[key] = val;
+                }
+            }
+        }
+        return ret;
+    }
+
+    function shallowCopy(obj) {
+        var ret = {}, key;
+        for (key in obj) {
+            if (obj.hasOwnProperty(key)) {
+                ret[key] = obj[key];
+            }
+        }
+        return ret;
+    }
+    ignoreJSHintError(shallowCopy);
+
+    // based on LLVM libc++ upper_bound / lower_bound
+    // MIT License
+
+    function upperBound(array, func) {
+        var diff, len, i, current;
+
+        len = array.length;
+        i = 0;
+
+        while (len) {
+            diff = len >>> 1;
+            current = i + diff;
+            if (func(array[current])) {
+                len = diff;
+            } else {
+                i = current + 1;
+                len -= diff + 1;
+            }
+        }
+        return i;
+    }
+
+    function lowerBound(array, func) {
+        var diff, len, i, current;
+
+        len = array.length;
+        i = 0;
+
+        while (len) {
+            diff = len >>> 1;
+            current = i + diff;
+            if (func(array[current])) {
+                i = current + 1;
+                len -= diff + 1;
+            } else {
+                len = diff;
+            }
+        }
+        return i;
+    }
+    ignoreJSHintError(lowerBound);
+
+    objectCreate = Object.create || (function () {
+        function F() { }
+
+        return function (o) {
+            F.prototype = o;
+            return new F();
+        };
+    })();
+
+    objectKeys = Object.keys || function (o) {
+        var keys = [], key;
+        for (key in o) {
+            keys.push(key);
+        }
+        return keys;
+    };
+
+    function extend(to, from) {
+        objectKeys(from).forEach(function (key) {
+            to[key] = from[key];
+        });
+        return to;
+    }
+
+    Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        ArrayExpression: 'ArrayExpression',
+        ArrayPattern: 'ArrayPattern',
+        ArrowFunctionExpression: 'ArrowFunctionExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ClassBody: 'ClassBody',
+        ClassDeclaration: 'ClassDeclaration',
+        ClassExpression: 'ClassExpression',
+        ComprehensionBlock: 'ComprehensionBlock',  // CAUTION: It's deferred to ES7.
+        ComprehensionExpression: 'ComprehensionExpression',  // CAUTION: It's deferred to ES7.
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        DirectiveStatement: 'DirectiveStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExportBatchSpecifier: 'ExportBatchSpecifier',
+        ExportDeclaration: 'ExportDeclaration',
+        ExportSpecifier: 'ExportSpecifier',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        ForOfStatement: 'ForOfStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        ImportDeclaration: 'ImportDeclaration',
+        ImportDefaultSpecifier: 'ImportDefaultSpecifier',
+        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
+        ImportSpecifier: 'ImportSpecifier',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        MethodDefinition: 'MethodDefinition',
+        ModuleSpecifier: 'ModuleSpecifier',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        ObjectPattern: 'ObjectPattern',
+        Program: 'Program',
+        Property: 'Property',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SpreadElement: 'SpreadElement',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        TaggedTemplateExpression: 'TaggedTemplateExpression',
+        TemplateElement: 'TemplateElement',
+        TemplateLiteral: 'TemplateLiteral',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement',
+        YieldExpression: 'YieldExpression'
+    };
+
+    VisitorKeys = {
+        AssignmentExpression: ['left', 'right'],
+        ArrayExpression: ['elements'],
+        ArrayPattern: ['elements'],
+        ArrowFunctionExpression: ['params', 'defaults', 'rest', 'body'],
+        BlockStatement: ['body'],
+        BinaryExpression: ['left', 'right'],
+        BreakStatement: ['label'],
+        CallExpression: ['callee', 'arguments'],
+        CatchClause: ['param', 'body'],
+        ClassBody: ['body'],
+        ClassDeclaration: ['id', 'body', 'superClass'],
+        ClassExpression: ['id', 'body', 'superClass'],
+        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.
+        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
+        ConditionalExpression: ['test', 'consequent', 'alternate'],
+        ContinueStatement: ['label'],
+        DebuggerStatement: [],
+        DirectiveStatement: [],
+        DoWhileStatement: ['body', 'test'],
+        EmptyStatement: [],
+        ExportBatchSpecifier: [],
+        ExportDeclaration: ['declaration', 'specifiers', 'source'],
+        ExportSpecifier: ['id', 'name'],
+        ExpressionStatement: ['expression'],
+        ForStatement: ['init', 'test', 'update', 'body'],
+        ForInStatement: ['left', 'right', 'body'],
+        ForOfStatement: ['left', 'right', 'body'],
+        FunctionDeclaration: ['id', 'params', 'defaults', 'rest', 'body'],
+        FunctionExpression: ['id', 'params', 'defaults', 'rest', 'body'],
+        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
+        Identifier: [],
+        IfStatement: ['test', 'consequent', 'alternate'],
+        ImportDeclaration: ['specifiers', 'source'],
+        ImportDefaultSpecifier: ['id'],
+        ImportNamespaceSpecifier: ['id'],
+        ImportSpecifier: ['id', 'name'],
+        Literal: [],
+        LabeledStatement: ['label', 'body'],
+        LogicalExpression: ['left', 'right'],
+        MemberExpression: ['object', 'property'],
+        MethodDefinition: ['key', 'value'],
+        ModuleSpecifier: [],
+        NewExpression: ['callee', 'arguments'],
+        ObjectExpression: ['properties'],
+        ObjectPattern: ['properties'],
+        Program: ['body'],
+        Property: ['key', 'value'],
+        ReturnStatement: ['argument'],
+        SequenceExpression: ['expressions'],
+        SpreadElement: ['argument'],
+        SwitchStatement: ['discriminant', 'cases'],
+        SwitchCase: ['test', 'consequent'],
+        TaggedTemplateExpression: ['tag', 'quasi'],
+        TemplateElement: [],
+        TemplateLiteral: ['quasis', 'expressions'],
+        ThisExpression: [],
+        ThrowStatement: ['argument'],
+        TryStatement: ['block', 'handlers', 'handler', 'guardedHandlers', 'finalizer'],
+        UnaryExpression: ['argument'],
+        UpdateExpression: ['argument'],
+        VariableDeclaration: ['declarations'],
+        VariableDeclarator: ['id', 'init'],
+        WhileStatement: ['test', 'body'],
+        WithStatement: ['object', 'body'],
+        YieldExpression: ['argument']
+    };
+
+    // unique id
+    BREAK = {};
+    SKIP = {};
+    REMOVE = {};
+
+    VisitorOption = {
+        Break: BREAK,
+        Skip: SKIP,
+        Remove: REMOVE
+    };
+
+    function Reference(parent, key) {
+        this.parent = parent;
+        this.key = key;
+    }
+
+    Reference.prototype.replace = function replace(node) {
+        this.parent[this.key] = node;
+    };
+
+    Reference.prototype.remove = function remove() {
+        if (isArray(this.parent)) {
+            this.parent.splice(this.key, 1);
+            return true;
+        } else {
+            this.replace(null);
+            return false;
+        }
+    };
+
+    function Element(node, path, wrap, ref) {
+        this.node = node;
+        this.path = path;
+        this.wrap = wrap;
+        this.ref = ref;
+    }
+
+    function Controller() { }
+
+    // API:
+    // return property path array from root to current node
+    Controller.prototype.path = function path() {
+        var i, iz, j, jz, result, element;
+
+        function addToPath(result, path) {
+            if (isArray(path)) {
+                for (j = 0, jz = path.length; j < jz; ++j) {
+                    result.push(path[j]);
+                }
+            } else {
+                result.push(path);
+            }
+        }
+
+        // root node
+        if (!this.__current.path) {
+            return null;
+        }
+
+        // first node is sentinel, second node is root element
+        result = [];
+        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {
+            element = this.__leavelist[i];
+            addToPath(result, element.path);
+        }
+        addToPath(result, this.__current.path);
+        return result;
+    };
+
+    // API:
+    // return type of current node
+    Controller.prototype.type = function () {
+        var node = this.current();
+        return node.type || this.__current.wrap;
+    };
+
+    // API:
+    // return array of parent elements
+    Controller.prototype.parents = function parents() {
+        var i, iz, result;
+
+        // first node is sentinel
+        result = [];
+        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {
+            result.push(this.__leavelist[i].node);
+        }
+
+        return result;
+    };
+
+    // API:
+    // return current node
+    Controller.prototype.current = function current() {
+        return this.__current.node;
+    };
+
+    Controller.prototype.__execute = function __execute(callback, element) {
+        var previous, result;
+
+        result = undefined;
+
+        previous  = this.__current;
+        this.__current = element;
+        this.__state = null;
+        if (callback) {
+            result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);
+        }
+        this.__current = previous;
+
+        return result;
+    };
+
+    // API:
+    // notify control skip / break
+    Controller.prototype.notify = function notify(flag) {
+        this.__state = flag;
+    };
+
+    // API:
+    // skip child nodes of current node
+    Controller.prototype.skip = function () {
+        this.notify(SKIP);
+    };
+
+    // API:
+    // break traversals
+    Controller.prototype['break'] = function () {
+        this.notify(BREAK);
+    };
+
+    // API:
+    // remove node
+    Controller.prototype.remove = function () {
+        this.notify(REMOVE);
+    };
+
+    Controller.prototype.__initialize = function(root, visitor) {
+        this.visitor = visitor;
+        this.root = root;
+        this.__worklist = [];
+        this.__leavelist = [];
+        this.__current = null;
+        this.__state = null;
+        this.__fallback = visitor.fallback === 'iteration';
+        this.__keys = VisitorKeys;
+        if (visitor.keys) {
+            this.__keys = extend(objectCreate(this.__keys), visitor.keys);
+        }
+    };
+
+    function isNode(node) {
+        if (node == null) {
+            return false;
+        }
+        return typeof node === 'object' && typeof node.type === 'string';
+    }
+
+    function isProperty(nodeType, key) {
+        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;
+    }
+
+    Controller.prototype.traverse = function traverse(root, visitor) {
+        var worklist,
+            leavelist,
+            element,
+            node,
+            nodeType,
+            ret,
+            key,
+            current,
+            current2,
+            candidates,
+            candidate,
+            sentinel;
+
+        this.__initialize(root, visitor);
+
+        sentinel = {};
+
+        // reference
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+
+        // initialize
+        worklist.push(new Element(root, null, null, null));
+        leavelist.push(new Element(null, null, null, null));
+
+        while (worklist.length) {
+            element = worklist.pop();
+
+            if (element === sentinel) {
+                element = leavelist.pop();
+
+                ret = this.__execute(visitor.leave, element);
+
+                if (this.__state === BREAK || ret === BREAK) {
+                    return;
+                }
+                continue;
+            }
+
+            if (element.node) {
+
+                ret = this.__execute(visitor.enter, element);
+
+                if (this.__state === BREAK || ret === BREAK) {
+                    return;
+                }
+
+                worklist.push(sentinel);
+                leavelist.push(element);
+
+                if (this.__state === SKIP || ret === SKIP) {
+                    continue;
+                }
+
+                node = element.node;
+                nodeType = element.wrap || node.type;
+                candidates = this.__keys[nodeType];
+                if (!candidates) {
+                    if (this.__fallback) {
+                        candidates = objectKeys(node);
+                    } else {
+                        throw new Error('Unknown node type ' + nodeType + '.');
+                    }
+                }
+
+                current = candidates.length;
+                while ((current -= 1) >= 0) {
+                    key = candidates[current];
+                    candidate = node[key];
+                    if (!candidate) {
+                        continue;
+                    }
+
+                    if (isArray(candidate)) {
+                        current2 = candidate.length;
+                        while ((current2 -= 1) >= 0) {
+                            if (!candidate[current2]) {
+                                continue;
+                            }
+                            if (isProperty(nodeType, candidates[current])) {
+                                element = new Element(candidate[current2], [key, current2], 'Property', null);
+                            } else if (isNode(candidate[current2])) {
+                                element = new Element(candidate[current2], [key, current2], null, null);
+                            } else {
+                                continue;
+                            }
+                            worklist.push(element);
+                        }
+                    } else if (isNode(candidate)) {
+                        worklist.push(new Element(candidate, key, null, null));
+                    }
+                }
+            }
+        }
+    };
+
+    Controller.prototype.replace = function replace(root, visitor) {
+        function removeElem(element) {
+            var i,
+                key,
+                nextElem,
+                parent;
+
+            if (element.ref.remove()) {
+                // When the reference is an element of an array.
+                key = element.ref.key;
+                parent = element.ref.parent;
+
+                // If removed from array, then decrease following items' keys.
+                i = worklist.length;
+                while (i--) {
+                    nextElem = worklist[i];
+                    if (nextElem.ref && nextElem.ref.parent === parent) {
+                        if  (nextElem.ref.key < key) {
+                            break;
+                        }
+                        --nextElem.ref.key;
+                    }
+                }
+            }
+        }
+
+        var worklist,
+            leavelist,
+            node,
+            nodeType,
+            target,
+            element,
+            current,
+            current2,
+            candidates,
+            candidate,
+            sentinel,
+            outer,
+            key;
+
+        this.__initialize(root, visitor);
+
+        sentinel = {};
+
+        // reference
+        worklist = this.__worklist;
+        leavelist = this.__leavelist;
+
+        // initialize
+        outer = {
+            root: root
+        };
+        element = new Element(root, null, null, new Reference(outer, 'root'));
+        worklist.push(element);
+        leavelist.push(element);
+
+        while (worklist.length) {
+            element = worklist.pop();
+
+            if (element === sentinel) {
+                element = leavelist.pop();
+
+                target = this.__execute(visitor.leave, element);
+
+                // node may be replaced with null,
+                // so distinguish between undefined and null in this place
+                if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+                    // replace
+                    element.ref.replace(target);
+                }
+
+                if (this.__state === REMOVE || target === REMOVE) {
+                    removeElem(element);
+                }
+
+                if (this.__state === BREAK || target === BREAK) {
+                    return outer.root;
+                }
+                continue;
+            }
+
+            target = this.__execute(visitor.enter, element);
+
+            // node may be replaced with null,
+            // so distinguish between undefined and null in this place
+            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
+                // replace
+                element.ref.replace(target);
+                element.node = target;
+            }
+
+            if (this.__state === REMOVE || target === REMOVE) {
+                removeElem(element);
+                element.node = null;
+            }
+
+            if (this.__state === BREAK || target === BREAK) {
+                return outer.root;
+            }
+
+            // node may be null
+            node = element.node;
+            if (!node) {
+                continue;
+            }
+
+            worklist.push(sentinel);
+            leavelist.push(element);
+
+            if (this.__state === SKIP || target === SKIP) {
+                continue;
+            }
+
+            nodeType = element.wrap || node.type;
+            candidates = this.__keys[nodeType];
+            if (!candidates) {
+                if (this.__fallback) {
+                    candidates = objectKeys(node);
+                } else {
+                    throw new Error('Unknown node type ' + nodeType + '.');
+                }
+            }
+
+            current = candidates.length;
+            while ((current -= 1) >= 0) {
+                key = candidates[current];
+                candidate = node[key];
+                if (!candidate) {
+                    continue;
+                }
+
+                if (isArray(candidate)) {
+                    current2 = candidate.length;
+                    while ((current2 -= 1) >= 0) {
+                        if (!candidate[current2]) {
+                            continue;
+                        }
+                        if (isProperty(nodeType, candidates[current])) {
+                            element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));
+                        } else if (isNode(candidate[current2])) {
+                            element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));
+                        } else {
+                            continue;
+                        }
+                        worklist.push(element);
+                    }
+                } else if (isNode(candidate)) {
+                    worklist.push(new Element(candidate, key, null, new Reference(node, key)));
+                }
+            }
+        }
+
+        return outer.root;
+    };
+
+    function traverse(root, visitor) {
+        var controller = new Controller();
+        return controller.traverse(root, visitor);
+    }
+
+    function replace(root, visitor) {
+        var controller = new Controller();
+        return controller.replace(root, visitor);
+    }
+
+    function extendCommentRange(comment, tokens) {
+        var target;
+
+        target = upperBound(tokens, function search(token) {
+            return token.range[0] > comment.range[0];
+        });
+
+        comment.extendedRange = [comment.range[0], comment.range[1]];
+
+        if (target !== tokens.length) {
+            comment.extendedRange[1] = tokens[target].range[0];
+        }
+
+        target -= 1;
+        if (target >= 0) {
+            comment.extendedRange[0] = tokens[target].range[1];
+        }
+
+        return comment;
+    }
+
+    function attachComments(tree, providedComments, tokens) {
+        // At first, we should calculate extended comment ranges.
+        var comments = [], comment, len, i, cursor;
+
+        if (!tree.range) {
+            throw new Error('attachComments needs range information');
+        }
+
+        // tokens array is empty, we attach comments to tree as 'leadingComments'
+        if (!tokens.length) {
+            if (providedComments.length) {
+                for (i = 0, len = providedComments.length; i < len; i += 1) {
+                    comment = deepCopy(providedComments[i]);
+                    comment.extendedRange = [0, tree.range[0]];
+                    comments.push(comment);
+                }
+                tree.leadingComments = comments;
+            }
+            return tree;
+        }
+
+        for (i = 0, len = providedComments.length; i < len; i += 1) {
+            comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
+        }
+
+        // This is based on John Freeman's implementation.
+        cursor = 0;
+        traverse(tree, {
+            enter: function (node) {
+                var comment;
+
+                while (cursor < comments.length) {
+                    comment = comments[cursor];
+                    if (comment.extendedRange[1] > node.range[0]) {
+                        break;
+                    }
+
+                    if (comment.extendedRange[1] === node.range[0]) {
+                        if (!node.leadingComments) {
+                            node.leadingComments = [];
+                        }
+                        node.leadingComments.push(comment);
+                        comments.splice(cursor, 1);
+                    } else {
+                        cursor += 1;
+                    }
+                }
+
+                // already out of owned node
+                if (cursor === comments.length) {
+                    return VisitorOption.Break;
+                }
+
+                if (comments[cursor].extendedRange[0] > node.range[1]) {
+                    return VisitorOption.Skip;
+                }
+            }
+        });
+
+        cursor = 0;
+        traverse(tree, {
+            leave: function (node) {
+                var comment;
+
+                while (cursor < comments.length) {
+                    comment = comments[cursor];
+                    if (node.range[1] < comment.extendedRange[0]) {
+                        break;
+                    }
+
+                    if (node.range[1] === comment.extendedRange[0]) {
+                        if (!node.trailingComments) {
+                            node.trailingComments = [];
+                        }
+                        node.trailingComments.push(comment);
+                        comments.splice(cursor, 1);
+                    } else {
+                        cursor += 1;
+                    }
+                }
+
+                // already out of owned node
+                if (cursor === comments.length) {
+                    return VisitorOption.Break;
+                }
+
+                if (comments[cursor].extendedRange[0] > node.range[1]) {
+                    return VisitorOption.Skip;
+                }
+            }
+        });
+
+        return tree;
+    }
+
+    exports.version = '1.8.0';
+    exports.Syntax = Syntax;
+    exports.traverse = traverse;
+    exports.replace = replace;
+    exports.attachComments = attachComments;
+    exports.VisitorKeys = VisitorKeys;
+    exports.VisitorOption = VisitorOption;
+    exports.Controller = Controller;
+}));
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/packages/context-coloring/languages/javascript/scopifier.js b/packages/context-coloring/languages/javascript/scopifier.js
new file mode 100644
index 0000000..fd3549a
--- /dev/null
+++ b/packages/context-coloring/languages/javascript/scopifier.js
@@ -0,0 +1,129 @@
+// Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+// This file is part of GNU Emacs.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+'use strict';
+
+var escope = require('./libraries/escope'),
+    esprima = require('./libraries/esprima');
+
+// Given code, returns an array of tokens for context-coloring.
+function scopifier(code) {
+
+    var analyzedScopes,
+        ast,
+        definition,
+        definitionsCount,
+        definitionsIndex,
+        i,
+        isDefined,
+        j,
+        k,
+        pointer,
+        range,
+        reference,
+        scope,
+        scopes,
+        tokens,
+        variable;
+
+    // Strip BOM.
+    code = code.replace(/^\ufeff/g, '');
+
+    // Gracefully handle parse errors by doing nothing.
+    try {
+        ast = esprima.parse(code, {
+            range: true
+        });
+        analyzedScopes = escope.analyze(ast).scopes;
+    } catch (error) {
+        process.exit(1);
+    }
+
+    scopes = [];
+    tokens = [];
+    for (i = 0; i < analyzedScopes.length; i += 1) {
+        scope = analyzedScopes[i];
+        // Having its level set implies it was already annotated.
+        if (scope.level === undefined) {
+            if (scope.upper) {
+                if (scope.upper.functionExpressionScope) {
+                    // Pretend function expression scope doesn't exist.
+                    scope.level = scope.upper.level;
+                    scope.variables = scope.upper.variables.concat(scope.variables);
+                } else {
+                    scope.level = scope.upper.level + 1;
+                }
+            } else {
+                // Base case.
+                scope.level = 0;
+            }
+            // We've only given the scope a level for posterity's sake.  We're
+            // done now.
+            if (!scope.functionExpressionScope) {
+                range = scope.block.range;
+                scopes.push(
+                    range[0] + 1,
+                    range[1] + 1,
+                    scope.level
+                );
+                definitionsIndex = tokens.length;
+                definitionsCount = 0;
+                for (j = 0; j < scope.variables.length; j += 1) {
+                    variable = scope.variables[j];
+                    definitionsCount += variable.defs.length;
+                    for (k = 0; k < variable.defs.length; k += 1) {
+                        definition = variable.defs[k];
+                        range = definition.name.range;
+                        tokens.push(
+                            range[0] + 1,
+                            range[1] + 1,
+                            scope.level
+                        );
+                    }
+                }
+                for (j = 0; j < scope.references.length; j += 1) {
+                    reference = scope.references[j];
+                    range = reference.identifier.range;
+                    isDefined = false;
+                    // Determine if a definition already exists for the range.
+                    // (escope detects variables twice if they are declared and
+                    // initialized simultaneously; this filters them.)
+                    for (k = 0; k < definitionsCount; k += 1) {
+                        pointer = definitionsIndex + (k * 3);
+                        if (tokens[pointer] === range[0] + 1 &&
+                                tokens[pointer + 1] === range[1] + 1) {
+                            isDefined = true;
+                            break;
+                        }
+                    }
+                    if (!isDefined) {
+                        tokens.push(
+                            // Handle global references too.
+                            range[0] + 1,
+                            range[1] + 1,
+                            reference.resolved ? reference.resolved.scope.level : 0
+                        );
+                    }
+                }
+            }
+        }
+    }
+
+    return scopes.concat(tokens);
+}
+
+module.exports = scopifier;
diff --git a/packages/context-coloring/libraries/.dir-locals.el b/packages/context-coloring/libraries/.dir-locals.el
new file mode 100644
index 0000000..d0b7cd5
--- /dev/null
+++ b/packages/context-coloring/libraries/.dir-locals.el
@@ -0,0 +1,2 @@
+((nil . ((sentence-end-double-space . t)
+         (buffer-read-only . t))))
diff --git a/packages/context-coloring/libraries/ert-async.el b/packages/context-coloring/libraries/ert-async.el
new file mode 100644
index 0000000..bcff3b0
--- /dev/null
+++ b/packages/context-coloring/libraries/ert-async.el
@@ -0,0 +1,89 @@
+;;; ert-async.el --- Async support for ERT -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014 Johan Andersson
+
+;; Author: Johan Andersson <address@hidden>
+;; Maintainer: Johan Andersson <address@hidden>
+;; Version: 0.1.1
+;; Keywords: test
+;; URL: http://github.com/rejeep/ert-async.el
+
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+
+(defvar ert-async-timeout 10
+  "Number of seconds to wait for callbacks before failing.")
+
+(defun ert-async-activate-font-lock-keywords ()
+  "Activate font-lock keywords for `ert-deftest-async'."
+  (font-lock-add-keywords
+   nil
+   '(("(\\(\\<ert-deftest\\(?:-async\\)?\\)\\>\\s *\\(\\(?:\\sw\\|\\s_\\)+\\)?"
+      (1 font-lock-keyword-face nil t)
+      (2 font-lock-function-name-face nil t)))))
+
+(defmacro ert-deftest-async (name callbacks &rest body)
+  "Like `ert-deftest' but with support for async.
+
+NAME is the name of the test, which is the first argument to
+`ert-deftest'.
+
+CALLBACKS is a list of callback functions that all must be called
+before `ert-async-timeout'.  If all callback functions have not
+been called before the timeout, the test fails.
+
+The callback functions should be called without any argument.  If
+a callback function is called with a string as argument, the test
+will fail with that error string.
+
+BODY is the actual test."
+  (declare (indent 2))
+  (let ((varlist
+         (cons
+          'callbacked
+          (mapcar
+           (lambda (callback)
+             (list
+              callback
+              `(lambda (&optional error-message)
+                 (if error-message
+                     (ert-fail (format "Callback %s invoked with argument: %s" ',callback error-message))
+                   (if (member ',callback callbacked)
+                       (ert-fail (format "Callback %s called multiple times" ',callback))
+                     (push ',callback callbacked))))))
+           callbacks))))
+    `(ert-deftest ,name ()
+       (let* ,varlist
+         (with-timeout
+             (ert-async-timeout
+              (ert-fail (format "Timeout of %ds exceeded" ert-async-timeout)))
+           ,@body
+           (while (not (equal (sort (mapcar 'symbol-name callbacked) 'string<)
+                              (sort (mapcar 'symbol-name ',callbacks) 'string<)))
+             (accept-process-output nil 0.05)))))))
+
+(provide 'ert-async)
+
+;;; ert-async.el ends here
diff --git a/packages/context-coloring/libraries/js2-mode.el b/packages/context-coloring/libraries/js2-mode.el
new file mode 100644
index 0000000..c332cfc
--- /dev/null
+++ b/packages/context-coloring/libraries/js2-mode.el
@@ -0,0 +1,12331 @@
+;;; js2-mode.el --- Improved JavaScript editing mode
+
+;; Copyright (C) 2009, 2011-2014  Free Software Foundation, Inc.
+
+;; Author: Steve Yegge <address@hidden>
+;;         mooz <address@hidden>
+;;         Dmitry Gutov <address@hidden>
+;; URL:  https://github.com/mooz/js2-mode/
+;;       http://code.google.com/p/js2-mode/
+;; Version: 20141118
+;; Keywords: languages, javascript
+;; Package-Requires: ((emacs "24.1") (cl-lib "0.5"))
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This JavaScript editing mode supports:
+
+;;  - strict recognition of the Ecma-262 language standard
+;;  - support for most Rhino and SpiderMonkey extensions from 1.5 and up
+;;  - parsing support for ECMAScript for XML (E4X, ECMA-357)
+;;  - accurate syntax highlighting using a recursive-descent parser
+;;  - on-the-fly reporting of syntax errors and strict-mode warnings
+;;  - undeclared-variable warnings using a configurable externs framework
+;;  - "bouncing" line indentation to choose among alternate indentation points
+;;  - smart line-wrapping within comments and strings
+;;  - code folding:
+;;    - show some or all function bodies as {...}
+;;    - show some or all block comments as /*...*/
+;;  - context-sensitive menu bar and popup menus
+;;  - code browsing using the `imenu' package
+;;  - many customization options
+
+;; Installation:
+;;
+;; To install it as your major mode for JavaScript editing:
+
+;;   (add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))
+
+;; Alternatively, to install it as a minor mode just for JavaScript linting,
+;; you must add it to the appropriate major-mode hook.  Normally this would be:
+
+;;   (add-hook 'js-mode-hook 'js2-minor-mode)
+
+;; You may also want to hook it in for shell scripts running via node.js:
+
+;;   (add-to-list 'interpreter-mode-alist '("node" . js2-mode))
+
+;; To customize how it works:
+;;   M-x customize-group RET js2-mode RET
+
+;; Notes:
+
+;; This mode includes a port of Mozilla Rhino's scanner, parser and
+;; symbol table.  Ideally it should stay in sync with Rhino, keeping
+;; `js2-mode' current as the EcmaScript language standard evolves.
+
+;; Unlike cc-engine based language modes, js2-mode's line-indentation is not
+;; customizable.  It is a surprising amount of work to support customizable
+;; indentation.  The current compromise is that the tab key lets you cycle among
+;; various likely indentation points, similar to the behavior of python-mode.
+
+;; This mode does not yet work with "multi-mode" modes such as `mmm-mode'
+;; and `mumamo', although it could be made to do so with some effort.
+;; This means that `js2-mode' is currently only useful for editing JavaScript
+;; files, and not for editing JavaScript within <script> tags or templates.
+
+;; The project page on GitHub is used for development and issue tracking.
+;; The original homepage at Google Code has outdated information and is mostly
+;; unmaintained.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'imenu)
+(require 'cc-cmds)  ; for `c-fill-paragraph'
+
+(eval-and-compile
+  (require 'cc-mode)     ; (only) for `c-populate-syntax-table'
+  (require 'cc-engine))  ; for `c-paragraph-start' et. al.
+
+(defvar electric-layout-rules)
+
+;;; Externs (variables presumed to be defined by the host system)
+
+(defvar js2-ecma-262-externs
+  (mapcar 'symbol-name
+          '(Array Boolean Date Error EvalError Function Infinity JSON
+          Math NaN Number Object RangeError ReferenceError RegExp
+          String SyntaxError TypeError URIError
+          decodeURI decodeURIComponent encodeURI
+          encodeURIComponent escape eval isFinite isNaN
+          parseFloat parseInt undefined unescape))
+"Ecma-262 externs.  Included in `js2-externs' by default.")
+
+(defvar js2-browser-externs
+  (mapcar 'symbol-name
+          '(;; DOM level 1
+            Attr CDATASection CharacterData Comment DOMException
+            DOMImplementation Document DocumentFragment
+            DocumentType Element Entity EntityReference
+            ExceptionCode NamedNodeMap Node NodeList Notation
+            ProcessingInstruction Text
+
+            ;; DOM level 2
+            HTMLAnchorElement HTMLAppletElement HTMLAreaElement
+            HTMLBRElement HTMLBaseElement HTMLBaseFontElement
+            HTMLBodyElement HTMLButtonElement HTMLCollection
+            HTMLDListElement HTMLDirectoryElement HTMLDivElement
+            HTMLDocument HTMLElement HTMLFieldSetElement
+            HTMLFontElement HTMLFormElement HTMLFrameElement
+            HTMLFrameSetElement HTMLHRElement HTMLHeadElement
+            HTMLHeadingElement HTMLHtmlElement HTMLIFrameElement
+            HTMLImageElement HTMLInputElement HTMLIsIndexElement
+            HTMLLIElement HTMLLabelElement HTMLLegendElement
+            HTMLLinkElement HTMLMapElement HTMLMenuElement
+            HTMLMetaElement HTMLModElement HTMLOListElement
+            HTMLObjectElement HTMLOptGroupElement
+            HTMLOptionElement HTMLOptionsCollection
+            HTMLParagraphElement HTMLParamElement HTMLPreElement
+            HTMLQuoteElement HTMLScriptElement HTMLSelectElement
+            HTMLStyleElement HTMLTableCaptionElement
+            HTMLTableCellElement HTMLTableColElement
+            HTMLTableElement HTMLTableRowElement
+            HTMLTableSectionElement HTMLTextAreaElement
+            HTMLTitleElement HTMLUListElement
+
+            ;; DOM level 3
+            DOMConfiguration DOMError DOMException
+            DOMImplementationList DOMImplementationSource
+            DOMLocator DOMStringList NameList TypeInfo
+            UserDataHandler
+
+            ;; Window
+            window alert confirm document java navigator prompt screen
+            self top
+
+            ;; W3C CSS
+            CSSCharsetRule CSSFontFace CSSFontFaceRule
+            CSSImportRule CSSMediaRule CSSPageRule
+            CSSPrimitiveValue CSSProperties CSSRule CSSRuleList
+            CSSStyleDeclaration CSSStyleRule CSSStyleSheet
+            CSSValue CSSValueList Counter DOMImplementationCSS
+            DocumentCSS DocumentStyle ElementCSSInlineStyle
+            LinkStyle MediaList RGBColor Rect StyleSheet
+            StyleSheetList ViewCSS
+
+            ;; W3C Event
+            EventListener EventTarget Event DocumentEvent UIEvent
+            MouseEvent MutationEvent KeyboardEvent
+
+            ;; W3C Range
+            DocumentRange Range RangeException
+
+            ;; W3C XML
+            XPathResult XMLHttpRequest
+
+            ;; console object.  Provided by at least Chrome and Firefox.
+            console))
+  "Browser externs.
+You can cause these to be included or excluded with the custom
+variable `js2-include-browser-externs'.")
+
+(defvar js2-rhino-externs
+  (mapcar 'symbol-name
+          '(Packages importClass importPackage com org java
+            ;; Global object (shell) externs.
+            defineClass deserialize doctest gc help load
+            loadClass print quit readFile readUrl runCommand seal
+            serialize spawn sync toint32 version))
+  "Mozilla Rhino externs.
+Set `js2-include-rhino-externs' to t to include them.")
+
+(defvar js2-node-externs
+  (mapcar 'symbol-name
+          '(__dirname __filename Buffer clearInterval clearTimeout require
+            console exports global module process setInterval setTimeout))
+  "Node.js externs.
+Set `js2-include-node-externs' to t to include them.")
+
+(defvar js2-typed-array-externs
+  (mapcar 'symbol-name
+          '(ArrayBuffer Uint8ClampedArray DataView
+            Int8Array Uint8Array Int16Array Uint16Array Int32Array Uint32Array
+            Float32Array Float64Array))
+  "Khronos typed array externs. Available in most modern browsers and
+in node.js >= 0.6. If `js2-include-node-externs' or `js2-include-browser-externs'
+are enabled, these will also be included.")
+
+(defvar js2-harmony-externs
+  (mapcar 'symbol-name
+          '(Map Promise Proxy Reflect Set Symbol WeakMap WeakSet))
+  "ES6 externs.  If `js2-include-browser-externs' is enabled and
+`js2-language-version' is sufficiently high, these will be included.")
+
+;;; Variables
+
+(defun js2-mark-safe-local (name pred)
+  "Make the variable NAME buffer-local and mark it as safe file-local
+variable with predicate PRED."
+  (make-variable-buffer-local name)
+  (put name 'safe-local-variable pred))
+
+(defcustom js2-highlight-level 2
+  "Amount of syntax highlighting to perform.
+0 or a negative value means none.
+1 adds basic syntax highlighting.
+2 adds highlighting of some Ecma built-in properties.
+3 adds highlighting of many Ecma built-in functions."
+  :group 'js2-mode
+  :type '(choice (const :tag "None" 0)
+                 (const :tag "Basic" 1)
+                 (const :tag "Include Properties" 2)
+                 (const :tag "Include Functions" 3)))
+
+(defvar js2-mode-dev-mode-p nil
+  "Non-nil if running in development mode.  Normally nil.")
+
+(defgroup js2-mode nil
+  "An improved JavaScript mode."
+  :group 'languages)
+
+(defcustom js2-basic-offset (if (and (boundp 'c-basic-offset)
+                                     (numberp c-basic-offset))
+                                c-basic-offset
+                              4)
+  "Number of spaces to indent nested statements.
+Similar to `c-basic-offset'."
+  :group 'js2-mode
+  :type 'integer)
+(js2-mark-safe-local 'js2-basic-offset 'integerp)
+
+(defcustom js2-bounce-indent-p nil
+  "Non-nil to have indent-line function choose among alternatives.
+If nil, the indent-line function will indent to a predetermined column
+based on heuristic guessing.  If non-nil, then if the current line is
+already indented to that predetermined column, indenting will choose
+another likely column and indent to that spot.  Repeated invocation of
+the indent-line function will cycle among the computed alternatives.
+See the function `js2-bounce-indent' for details.  When it is non-nil,
+js2-mode also binds `js2-bounce-indent-backwards' to Shift-Tab."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-pretty-multiline-declarations t
+  "Non-nil to line up multiline declarations vertically:
+
+  var a = 10,
+      b = 20,
+      c = 30;
+
+If the value is not `all', and the first assigned value in
+declaration is a function/array/object literal spanning several
+lines, it won't be indented additionally:
+
+  var o = {                   var bar = 2,
+    foo: 3          vs.           o = {
+  },                                foo: 3
+      bar = 2;                    };"
+  :group 'js2-mode
+  :type 'symbol)
+(js2-mark-safe-local 'js2-pretty-multiline-declarations 'symbolp)
+
+(defcustom js2-indent-switch-body nil
+  "When nil, case labels are indented on the same level as the
+containing switch statement.  Otherwise, all lines inside
+switch statement body are indented one additional level."
+  :type 'boolean
+  :group 'js2-mode)
+(js2-mark-safe-local 'js2-indent-case-same-as-switch 'booleanp)
+
+(defcustom js2-idle-timer-delay 0.2
+  "Delay in secs before re-parsing after user makes changes.
+Multiplied by `js2-dynamic-idle-timer-adjust', which see."
+  :type 'number
+  :group 'js2-mode)
+(make-variable-buffer-local 'js2-idle-timer-delay)
+
+(defcustom js2-dynamic-idle-timer-adjust 0
+  "Positive to adjust `js2-idle-timer-delay' based on file size.
+The idea is that for short files, parsing is faster so we can be
+more responsive to user edits without interfering with editing.
+The buffer length in characters (typically bytes) is divided by
+this value and used to multiply `js2-idle-timer-delay' for the
+buffer.  For example, a 21k file and 10k adjust yields 21k/10k
+== 2, so js2-idle-timer-delay is multiplied by 2.
+If `js2-dynamic-idle-timer-adjust' is 0 or negative,
+`js2-idle-timer-delay' is not dependent on the file size."
+  :type 'number
+  :group 'js2-mode)
+
+(defcustom js2-concat-multiline-strings t
+  "When non-nil, `js2-line-break' in mid-string will make it a
+string concatenation. When `eol', the '+' will be inserted at the
+end of the line, otherwise, at the beginning of the next line."
+  :type '(choice (const t) (const eol) (const nil))
+  :group 'js2-mode)
+
+(defcustom js2-mode-show-parse-errors t
+  "True to highlight parse errors."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-mode-show-strict-warnings t
+  "Non-nil to emit Ecma strict-mode warnings.
+Some of the warnings can be individually disabled by other flags,
+even if this flag is non-nil."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-trailing-comma-warning t
+  "Non-nil to warn about trailing commas in array literals.
+Ecma-262-5.1 allows them, but older versions of IE raise an error."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-missing-semi-warning t
+  "Non-nil to warn about semicolon auto-insertion after statement.
+Technically this is legal per Ecma-262, but some style guides disallow
+depending on it."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-missing-semi-one-line-override nil
+  "Non-nil to permit missing semicolons in one-line functions.
+In one-liner functions such as `function identity(x) {return x}'
+people often omit the semicolon for a cleaner look.  If you are
+such a person, you can suppress the missing-semicolon warning
+by setting this variable to t."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-inconsistent-return-warning t
+  "Non-nil to warn about mixing returns with value-returns.
+It's perfectly legal to have a `return' and a `return foo' in the
+same function, but it's often an indicator of a bug, and it also
+interferes with type inference (in systems that support it.)"
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-cond-assign-warning t
+  "Non-nil to warn about expressions like if (a = b).
+This often should have been '==' instead of '='.  If the warning
+is enabled, you can suppress it on a per-expression basis by
+parenthesizing the expression, e.g. if ((a = b)) ..."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-var-redeclaration-warning t
+  "Non-nil to warn about redeclaring variables in a script or function."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-strict-var-hides-function-arg-warning t
+  "Non-nil to warn about a var decl hiding a function argument."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-skip-preprocessor-directives nil
+  "Non-nil to treat lines beginning with # as comments.
+Useful for viewing Mozilla JavaScript source code."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-language-version 200
+  "Configures what JavaScript language version to recognize.
+Currently versions 150, 160, 170, 180 and 200 are supported,
+corresponding to JavaScript 1.5, 1.6, 1.7, 1.8 and 2.0 (Harmony),
+respectively.  In a nutshell, 1.6 adds E4X support, 1.7 adds let,
+yield, and Array comprehensions, and 1.8 adds function closures."
+  :type 'integer
+  :group 'js2-mode)
+
+(defcustom js2-instanceof-has-side-effects nil
+  "If non-nil, treats the instanceof operator as having side effects.
+This is useful for xulrunner apps."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-move-point-on-right-click t
+  "Non-nil to move insertion point when you right-click.
+This makes right-click context menu behavior a bit more intuitive,
+since menu operations generally apply to the point.  The exception
+is if there is a region selection, in which case the point does -not-
+move, so cut/copy/paste can work properly.
+
+Note that IntelliJ moves the point, and Eclipse leaves it alone,
+so this behavior is customizable."
+  :group 'js2-mode
+  :type 'boolean)
+
+(defcustom js2-allow-rhino-new-expr-initializer t
+  "Non-nil to support a Rhino's experimental syntactic construct.
+
+Rhino supports the ability to follow a `new' expression with an object
+literal, which is used to set additional properties on the new object
+after calling its constructor.  Syntax:
+
+  new <expr> [ ( arglist ) ] [initializer]
+
+Hence, this expression:
+
+  new Object {a: 1, b: 2}
+
+results in an Object with properties a=1 and b=2.  This syntax is
+apparently not configurable in Rhino - it's currently always enabled,
+as of Rhino version 1.7R2."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-allow-member-expr-as-function-name nil
+  "Non-nil to support experimental Rhino syntax for function names.
+
+Rhino supports an experimental syntax configured via the Rhino Context
+setting `allowMemberExprAsFunctionName'.  The experimental syntax is:
+
+  function <member-expr> ( [ arg-list ] ) { <body> }
+
+Where member-expr is a non-parenthesized 'member expression', which
+is anything at the grammar level of a new-expression or lower, meaning
+any expression that does not involve infix or unary operators.
+
+When <member-expr> is not a simple identifier, then it is syntactic
+sugar for assigning the anonymous function to the <member-expr>.  Hence,
+this code:
+
+  function a.b().c[2] (x, y) { ... }
+
+is rewritten as:
+
+  a.b().c[2] = function(x, y) {...}
+
+which doesn't seem particularly useful, but Rhino permits it."
+  :type 'boolean
+  :group 'js2-mode)
+
+;; scanner variables
+
+(defmacro js2-deflocal (name value &optional comment)
+  "Define a buffer-local variable NAME with VALUE and COMMENT."
+  (declare (debug defvar) (doc-string 3))
+  `(progn
+     (defvar ,name ,value ,comment)
+     (make-variable-buffer-local ',name)))
+
+(defvar js2-EOF_CHAR -1
+  "Represents end of stream.  Distinct from js2-EOF token type.")
+
+;; I originally used symbols to represent tokens, but Rhino uses
+;; ints and then sets various flag bits in them, so ints it is.
+;; The upshot is that we need a `js2-' prefix in front of each name.
+(defvar js2-ERROR -1)
+(defvar js2-EOF 0)
+(defvar js2-EOL 1)
+(defvar js2-ENTERWITH 2)       ; begin interpreter bytecodes
+(defvar js2-LEAVEWITH 3)
+(defvar js2-RETURN 4)
+(defvar js2-GOTO 5)
+(defvar js2-IFEQ 6)
+(defvar js2-IFNE 7)
+(defvar js2-SETNAME 8)
+(defvar js2-BITOR 9)
+(defvar js2-BITXOR 10)
+(defvar js2-BITAND 11)
+(defvar js2-EQ 12)
+(defvar js2-NE 13)
+(defvar js2-LT 14)
+(defvar js2-LE 15)
+(defvar js2-GT 16)
+(defvar js2-GE 17)
+(defvar js2-LSH 18)
+(defvar js2-RSH 19)
+(defvar js2-URSH 20)
+(defvar js2-ADD 21)            ; infix plus
+(defvar js2-SUB 22)            ; infix minus
+(defvar js2-MUL 23)
+(defvar js2-DIV 24)
+(defvar js2-MOD 25)
+(defvar js2-NOT 26)
+(defvar js2-BITNOT 27)
+(defvar js2-POS 28)            ; unary plus
+(defvar js2-NEG 29)            ; unary minus
+(defvar js2-NEW 30)
+(defvar js2-DELPROP 31)
+(defvar js2-TYPEOF 32)
+(defvar js2-GETPROP 33)
+(defvar js2-GETPROPNOWARN 34)
+(defvar js2-SETPROP 35)
+(defvar js2-GETELEM 36)
+(defvar js2-SETELEM 37)
+(defvar js2-CALL 38)
+(defvar js2-NAME 39)           ; an identifier
+(defvar js2-NUMBER 40)
+(defvar js2-STRING 41)
+(defvar js2-NULL 42)
+(defvar js2-THIS 43)
+(defvar js2-FALSE 44)
+(defvar js2-TRUE 45)
+(defvar js2-SHEQ 46)           ; shallow equality (===)
+(defvar js2-SHNE 47)           ; shallow inequality (!==)
+(defvar js2-REGEXP 48)
+(defvar js2-BINDNAME 49)
+(defvar js2-THROW 50)
+(defvar js2-RETHROW 51)        ; rethrow caught exception: catch (e if ) uses it
+(defvar js2-IN 52)
+(defvar js2-INSTANCEOF 53)
+(defvar js2-LOCAL_LOAD 54)
+(defvar js2-GETVAR 55)
+(defvar js2-SETVAR 56)
+(defvar js2-CATCH_SCOPE 57)
+(defvar js2-ENUM_INIT_KEYS 58) ; FIXME: what are these?
+(defvar js2-ENUM_INIT_VALUES 59)
+(defvar js2-ENUM_INIT_ARRAY 60)
+(defvar js2-ENUM_NEXT 61)
+(defvar js2-ENUM_ID 62)
+(defvar js2-THISFN 63)
+(defvar js2-RETURN_RESULT 64)  ; to return previously stored return result
+(defvar js2-ARRAYLIT 65)       ; array literal
+(defvar js2-OBJECTLIT 66)      ; object literal
+(defvar js2-GET_REF 67)        ; *reference
+(defvar js2-SET_REF 68)        ; *reference = something
+(defvar js2-DEL_REF 69)        ; delete reference
+(defvar js2-REF_CALL 70)       ; f(args) = something or f(args)++
+(defvar js2-REF_SPECIAL 71)    ; reference for special properties like __proto
+(defvar js2-YIELD 72)          ; JS 1.7 yield pseudo keyword
+
+;; XML support
+(defvar js2-DEFAULTNAMESPACE 73)
+(defvar js2-ESCXMLATTR 74)
+(defvar js2-ESCXMLTEXT 75)
+(defvar js2-REF_MEMBER 76)     ; Reference for address@hidden, x..y etc.
+(defvar js2-REF_NS_MEMBER 77)  ; Reference for x.ns::y, x..ns::y etc.
+(defvar js2-REF_NAME 78)       ; Reference for @y, @[y] etc.
+(defvar js2-REF_NS_NAME 79)    ; Reference for ns::y, @ns::address@hidden etc.
+
+(defvar js2-first-bytecode js2-ENTERWITH)
+(defvar js2-last-bytecode js2-REF_NS_NAME)
+
+(defvar js2-TRY 80)
+(defvar js2-SEMI 81)           ; semicolon
+(defvar js2-LB 82)             ; left and right brackets
+(defvar js2-RB 83)
+(defvar js2-LC 84)             ; left and right curly-braces
+(defvar js2-RC 85)
+(defvar js2-LP 86)             ; left and right parens
+(defvar js2-RP 87)
+(defvar js2-COMMA 88)          ; comma operator
+
+(defvar js2-ASSIGN 89)         ; simple assignment (=)
+(defvar js2-ASSIGN_BITOR 90)   ; |=
+(defvar js2-ASSIGN_BITXOR 91)  ; ^=
+(defvar js2-ASSIGN_BITAND 92)  ; &=
+(defvar js2-ASSIGN_LSH 93)     ; <<=
+(defvar js2-ASSIGN_RSH 94)     ; >>=
+(defvar js2-ASSIGN_URSH 95)    ; >>>=
+(defvar js2-ASSIGN_ADD 96)     ; +=
+(defvar js2-ASSIGN_SUB 97)     ; -=
+(defvar js2-ASSIGN_MUL 98)     ; *=
+(defvar js2-ASSIGN_DIV 99)     ; /=
+(defvar js2-ASSIGN_MOD 100)    ; %=
+
+(defvar js2-first-assign js2-ASSIGN)
+(defvar js2-last-assign js2-ASSIGN_MOD)
+
+(defvar js2-HOOK 101)          ; conditional (?:)
+(defvar js2-COLON 102)
+(defvar js2-OR 103)            ; logical or (||)
+(defvar js2-AND 104)           ; logical and (&&)
+(defvar js2-INC 105)           ; increment/decrement (++ --)
+(defvar js2-DEC 106)
+(defvar js2-DOT 107)           ; member operator (.)
+(defvar js2-FUNCTION 108)      ; function keyword
+(defvar js2-EXPORT 109)        ; export keyword
+(defvar js2-IMPORT 110)        ; import keyword
+(defvar js2-IF 111)            ; if keyword
+(defvar js2-ELSE 112)          ; else keyword
+(defvar js2-SWITCH 113)        ; switch keyword
+(defvar js2-CASE 114)          ; case keyword
+(defvar js2-DEFAULT 115)       ; default keyword
+(defvar js2-WHILE 116)         ; while keyword
+(defvar js2-DO 117)            ; do keyword
+(defvar js2-FOR 118)           ; for keyword
+(defvar js2-BREAK 119)         ; break keyword
+(defvar js2-CONTINUE 120)      ; continue keyword
+(defvar js2-VAR 121)           ; var keyword
+(defvar js2-WITH 122)          ; with keyword
+(defvar js2-CATCH 123)         ; catch keyword
+(defvar js2-FINALLY 124)       ; finally keyword
+(defvar js2-VOID 125)          ; void keyword
+(defvar js2-RESERVED 126)      ; reserved keywords
+
+(defvar js2-EMPTY 127)
+
+;; Types used for the parse tree - never returned by scanner.
+
+(defvar js2-BLOCK 128)         ; statement block
+(defvar js2-LABEL 129)         ; label
+(defvar js2-TARGET 130)
+(defvar js2-LOOP 131)
+(defvar js2-EXPR_VOID 132)     ; expression statement in functions
+(defvar js2-EXPR_RESULT 133)   ; expression statement in scripts
+(defvar js2-JSR 134)
+(defvar js2-SCRIPT 135)        ; top-level node for entire script
+(defvar js2-TYPEOFNAME 136)    ; for typeof(simple-name)
+(defvar js2-USE_STACK 137)
+(defvar js2-SETPROP_OP 138)    ; x.y op= something
+(defvar js2-SETELEM_OP 139)    ; x[y] op= something
+(defvar js2-LOCAL_BLOCK 140)
+(defvar js2-SET_REF_OP 141)    ; *reference op= something
+
+;; For XML support:
+(defvar js2-DOTDOT 142)        ; member operator (..)
+(defvar js2-COLONCOLON 143)    ; namespace::name
+(defvar js2-XML 144)           ; XML type
+(defvar js2-DOTQUERY 145)      ; .() -- e.g., x.emps.emp.(name == "terry")
+(defvar js2-XMLATTR 146)       ; @
+(defvar js2-XMLEND 147)
+
+;; Optimizer-only tokens
+(defvar js2-TO_OBJECT 148)
+(defvar js2-TO_DOUBLE 149)
+
+(defvar js2-GET 150)           ; JS 1.5 get pseudo keyword
+(defvar js2-SET 151)           ; JS 1.5 set pseudo keyword
+(defvar js2-LET 152)           ; JS 1.7 let pseudo keyword
+(defvar js2-CONST 153)
+(defvar js2-SETCONST 154)
+(defvar js2-SETCONSTVAR 155)
+(defvar js2-ARRAYCOMP 156)
+(defvar js2-LETEXPR 157)
+(defvar js2-WITHEXPR 158)
+(defvar js2-DEBUGGER 159)
+
+(defvar js2-COMMENT 160)
+(defvar js2-TRIPLEDOT 161)     ; for rest parameter
+(defvar js2-ARROW 162)         ; function arrow (=>)
+(defvar js2-CLASS 163)
+(defvar js2-EXTENDS 164)
+(defvar js2-STATIC 165)
+(defvar js2-SUPER 166)
+(defvar js2-TEMPLATE_HEAD 167)    ; part of template literal before substitution
+(defvar js2-NO_SUBS_TEMPLATE 168) ; template literal without substitutions
+(defvar js2-TAGGED_TEMPLATE 169)  ; tagged template literal
+
+(defconst js2-num-tokens (1+ js2-TAGGED_TEMPLATE))
+
+(defconst js2-debug-print-trees nil)
+
+;; Rhino accepts any string or stream as input.  Emacs character
+;; processing works best in buffers, so we'll assume the input is a
+;; buffer.  JavaScript strings can be copied into temp buffers before
+;; scanning them.
+
+;; Buffer-local variables yield much cleaner code than using `defstruct'.
+;; They're the Emacs equivalent of instance variables, more or less.
+
+(js2-deflocal js2-ts-dirty-line nil
+  "Token stream buffer-local variable.
+Indicates stuff other than whitespace since start of line.")
+
+(js2-deflocal js2-ts-hit-eof nil
+  "Token stream buffer-local variable.")
+
+;; FIXME: Unused.
+(js2-deflocal js2-ts-line-start 0
+  "Token stream buffer-local variable.")
+
+(js2-deflocal js2-ts-lineno 1
+  "Token stream buffer-local variable.")
+
+;; FIXME: Unused.
+(js2-deflocal js2-ts-line-end-char -1
+  "Token stream buffer-local variable.")
+
+(js2-deflocal js2-ts-cursor 1  ; emacs buffers are 1-indexed
+  "Token stream buffer-local variable.
+Current scan position.")
+
+;; FIXME: Unused.
+(js2-deflocal js2-ts-is-xml-attribute nil
+  "Token stream buffer-local variable.")
+
+(js2-deflocal js2-ts-xml-is-tag-content nil
+  "Token stream buffer-local variable.")
+
+(js2-deflocal js2-ts-xml-open-tags-count 0
+  "Token stream buffer-local variable.")
+
+(js2-deflocal js2-ts-string-buffer nil
+  "Token stream buffer-local variable.
+List of chars built up while scanning various tokens.")
+
+(cl-defstruct (js2-token
+               (:constructor nil)
+               (:constructor make-js2-token (beg)))
+  "Value returned from the token stream."
+  (type js2-EOF)
+  (beg 1)
+  (end -1)
+  (string "")
+  number
+  regexp-flags
+  comment-type
+  follows-eol-p)
+
+;; Have to call `js2-init-scanner' to initialize the values.
+(js2-deflocal js2-ti-tokens nil)
+(js2-deflocal js2-ti-tokens-cursor nil)
+(js2-deflocal js2-ti-lookahead nil)
+
+(cl-defstruct (js2-ts-state
+               (:constructor make-js2-ts-state (&key (lineno js2-ts-lineno)
+                                                     (cursor js2-ts-cursor)
+                                                     (tokens (copy-sequence js2-ti-tokens))
+                                                     (tokens-cursor js2-ti-tokens-cursor)
+                                                     (lookahead js2-ti-lookahead))))
+  lineno
+  cursor
+  tokens
+  tokens-cursor
+  lookahead)
+
+;;; Parser variables
+
+(js2-deflocal js2-parsed-errors nil
+  "List of errors produced during scanning/parsing.")
+
+(js2-deflocal js2-parsed-warnings nil
+  "List of warnings produced during scanning/parsing.")
+
+(js2-deflocal js2-recover-from-parse-errors t
+  "Non-nil to continue parsing after a syntax error.
+
+In recovery mode, the AST will be built in full, and any error
+nodes will be flagged with appropriate error information.  If
+this flag is nil, a syntax error will result in an error being
+signaled.
+
+The variable is automatically buffer-local, because different
+modes that use the parser will need different settings.")
+
+(js2-deflocal js2-parse-hook nil
+  "List of callbacks for receiving parsing progress.")
+
+(defvar js2-parse-finished-hook nil
+  "List of callbacks to notify when parsing finishes.
+Not called if parsing was interrupted.")
+
+(js2-deflocal js2-is-eval-code nil
+  "True if we're evaluating code in a string.
+If non-nil, the tokenizer will record the token text, and the AST nodes
+will record their source text.  Off by default for IDE modes, since the
+text is available in the buffer.")
+
+(defvar js2-parse-ide-mode t
+  "Non-nil if the parser is being used for `js2-mode'.
+If non-nil, the parser will set text properties for fontification
+and the syntax table.  The value should be nil when using the
+parser as a frontend to an interpreter or byte compiler.")
+
+;;; Parser instance variables (buffer-local vars for js2-parse)
+
+(defconst js2-ti-after-eol (lsh 1 16)
+  "Flag:  first token of the source line.")
+
+;; Inline Rhino's CompilerEnvirons vars as buffer-locals.
+
+(js2-deflocal js2-compiler-generate-debug-info t)
+(js2-deflocal js2-compiler-use-dynamic-scope nil)
+(js2-deflocal js2-compiler-reserved-keywords-as-identifier nil)
+(js2-deflocal js2-compiler-xml-available t)
+(js2-deflocal js2-compiler-optimization-level 0)
+(js2-deflocal js2-compiler-generating-source t)
+(js2-deflocal js2-compiler-strict-mode nil)
+(js2-deflocal js2-compiler-report-warning-as-error nil)
+(js2-deflocal js2-compiler-generate-observer-count nil)
+(js2-deflocal js2-compiler-activation-names nil)
+
+;; SKIP:  sourceURI
+
+;; There's a compileFunction method in Context.java - may need it.
+(js2-deflocal js2-called-by-compile-function nil
+  "True if `js2-parse' was called by `js2-compile-function'.
+Will only be used when we finish implementing the interpreter.")
+
+;; SKIP:  ts  (we just call `js2-init-scanner' and use its vars)
+
+;; SKIP:  node factory - we're going to just call functions directly,
+;; and eventually go to a unified AST format.
+
+(js2-deflocal js2-nesting-of-function 0)
+
+(js2-deflocal js2-recorded-identifiers nil
+  "Tracks identifiers found during parsing.")
+
+(js2-deflocal js2-is-in-destructuring nil
+  "True while parsing destructuring expression.")
+
+(defcustom js2-global-externs nil
+  "A list of any extern names you'd like to consider always declared.
+This list is global and is used by all `js2-mode' files.
+You can create buffer-local externs list using `js2-additional-externs'.
+
+There is also a buffer-local variable `js2-default-externs',
+which is initialized by default to include the Ecma-262 externs
+and the standard browser externs.  The three lists are all
+checked during highlighting."
+  :type 'list
+  :group 'js2-mode)
+
+(js2-deflocal js2-default-externs nil
+  "Default external declarations.
+
+These are currently only used for highlighting undeclared variables,
+which only worries about top-level (unqualified) references.
+As js2-mode's processing improves, we will flesh out this list.
+
+The initial value is set to `js2-ecma-262-externs', unless some
+of the `js2-include-?-externs' variables are set to t, in which
+case the browser, Rhino and/or Node.js externs are also included.
+
+See `js2-additional-externs' for more information.")
+
+(defcustom js2-include-browser-externs t
+  "Non-nil to include browser externs in the master externs list.
+If you work on JavaScript files that are not intended for browsers,
+such as Mozilla Rhino server-side JavaScript, set this to nil.
+See `js2-additional-externs' for more information about externs."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-include-rhino-externs nil
+  "Non-nil to include Mozilla Rhino externs in the master externs list.
+See `js2-additional-externs' for more information about externs."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-include-node-externs nil
+  "Non-nil to include Node.js externs in the master externs list.
+See `js2-additional-externs' for more information about externs."
+  :type 'boolean
+  :group 'js2-mode)
+
+(js2-deflocal js2-additional-externs nil
+  "A buffer-local list of additional external declarations.
+It is used to decide whether variables are considered undeclared
+for purposes of highlighting.
+
+Each entry is a Lisp string.  The string should be the fully qualified
+name of an external entity.  All externs should be added to this list,
+so that as js2-mode's processing improves it can take advantage of them.
+
+You may want to declare your externs in three ways.
+First, you can add externs that are valid for all your JavaScript files.
+You should probably do this by adding them to `js2-global-externs', which
+is a global list used for all js2-mode files.
+
+Next, you can add a function to `js2-init-hook' that adds additional
+externs appropriate for the specific file, perhaps based on its path.
+These should go in `js2-additional-externs', which is buffer-local.
+
+Third, you can use JSLint's global declaration, as long as
+`js2-include-jslint-globals' is non-nil, which see.
+
+Finally, you can add a function to `js2-post-parse-callbacks',
+which is called after parsing completes, and `js2-mode-ast' is bound to
+the root of the parse tree.  At this stage you can set up an AST
+node visitor using `js2-visit-ast' and examine the parse tree
+for specific import patterns that may imply the existence of
+other externs, possibly tied to your build system.  These should also
+be added to `js2-additional-externs'.
+
+Your post-parse callback may of course also use the simpler and
+faster (but perhaps less robust) approach of simply scanning the
+buffer text for your imports, using regular expressions.")
+
+;; SKIP:  decompiler
+;; SKIP:  encoded-source
+
+;;; The following variables are per-function and should be saved/restored
+;;; during function parsing...
+
+(js2-deflocal js2-current-script-or-fn nil)
+(js2-deflocal js2-current-scope nil)
+(js2-deflocal js2-nesting-of-with 0)
+(js2-deflocal js2-label-set nil
+  "An alist mapping label names to nodes.")
+
+(js2-deflocal js2-loop-set nil)
+(js2-deflocal js2-loop-and-switch-set nil)
+(js2-deflocal js2-has-return-value nil)
+(js2-deflocal js2-end-flags 0)
+
+;;; ...end of per function variables
+
+;; These flags enumerate the possible ways a statement/function can
+;; terminate. These flags are used by endCheck() and by the Parser to
+;; detect inconsistent return usage.
+;;
+;; END_UNREACHED is reserved for code paths that are assumed to always be
+;; able to execute (example: throw, continue)
+;;
+;; END_DROPS_OFF indicates if the statement can transfer control to the
+;; next one. Statement such as return dont. A compound statement may have
+;; some branch that drops off control to the next statement.
+;;
+;; END_RETURNS indicates that the statement can return (without arguments)
+;; END_RETURNS_VALUE indicates that the statement can return a value.
+;;
+;; A compound statement such as
+;; if (condition) {
+;;   return value;
+;; }
+;; Will be detected as (END_DROPS_OFF | END_RETURN_VALUE) by endCheck()
+
+(defconst js2-end-unreached     #x0)
+(defconst js2-end-drops-off     #x1)
+(defconst js2-end-returns       #x2)
+(defconst js2-end-returns-value #x4)
+
+;; Rhino awkwardly passes a statementLabel parameter to the
+;; statementHelper() function, the main statement parser, which
+;; is then used by quite a few of the sub-parsers.  We just make
+;; it a buffer-local variable and make sure it's cleaned up properly.
+(js2-deflocal js2-labeled-stmt nil)  ; type `js2-labeled-stmt-node'
+
+;; Similarly, Rhino passes an inForInit boolean through about half
+;; the expression parsers.  We use a dynamically-scoped variable,
+;; which makes it easier to funcall the parsers individually without
+;; worrying about whether they take the parameter or not.
+(js2-deflocal js2-in-for-init nil)
+(js2-deflocal js2-temp-name-counter 0)
+(js2-deflocal js2-parse-stmt-count 0)
+
+(defsubst js2-get-next-temp-name ()
+  (format "$%d" (cl-incf js2-temp-name-counter)))
+
+(defvar js2-parse-interruptable-p t
+  "Set this to nil to force parse to continue until finished.
+This will mostly be useful for interpreters.")
+
+(defvar js2-statements-per-pause 50
+  "Pause after this many statements to check for user input.
+If user input is pending, stop the parse and discard the tree.
+This makes for a smoother user experience for large files.
+You may have to wait a second or two before the highlighting
+and error-reporting appear, but you can always type ahead if
+you wish.  This appears to be more or less how Eclipse, IntelliJ
+and other editors work.")
+
+(js2-deflocal js2-record-comments t
+  "Instructs the scanner to record comments in `js2-scanned-comments'.")
+
+(js2-deflocal js2-scanned-comments nil
+  "List of all comments from the current parse.")
+
+(defcustom js2-mode-indent-inhibit-undo nil
+  "Non-nil to disable collection of Undo information when indenting lines.
+Some users have requested this behavior.  It's nil by default because
+other Emacs modes don't work this way."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-mode-indent-ignore-first-tab nil
+  "If non-nil, ignore first TAB keypress if we look indented properly.
+It's fairly common for users to navigate to an already-indented line
+and press TAB for reassurance that it's been indented.  For this class
+of users, we want the first TAB press on a line to be ignored if the
+line is already indented to one of the precomputed alternatives.
+
+This behavior is only partly implemented.  If you TAB-indent a line,
+navigate to another line, and then navigate back, it fails to clear
+the last-indented variable, so it thinks you've already hit TAB once,
+and performs the indent.  A full solution would involve getting on the
+point-motion hooks for the entire buffer.  If we come across another
+use cases that requires watching point motion, I'll consider doing it.
+
+If you set this variable to nil, then the TAB key will always change
+the indentation of the current line, if more than one alternative
+indentation spot exists."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defvar js2-indent-hook nil
+  "A hook for user-defined indentation rules.
+
+Functions on this hook should expect two arguments:    (LIST INDEX)
+The LIST argument is the list of computed indentation points for
+the current line.  INDEX is the list index of the indentation point
+that `js2-bounce-indent' plans to use.  If INDEX is nil, then the
+indent function is not going to change the current line indentation.
+
+If a hook function on this list returns a non-nil value, then
+`js2-bounce-indent' assumes the hook function has performed its own
+indentation, and will do nothing.  If all hook functions on the list
+return nil, then `js2-bounce-indent' will use its computed indentation
+and reindent the line.
+
+When hook functions on this hook list are called, the variable
+`js2-mode-ast' may or may not be set, depending on whether the
+parse tree is available.  If the variable is nil, you can pass a
+callback to `js2-mode-wait-for-parse', and your callback will be
+called after the new parse tree is built.  This can take some time
+in large files.")
+
+(defface js2-warning
+  `((((class color) (background light))
+     (:underline  "orange"))
+    (((class color) (background dark))
+     (:underline "orange"))
+    (t (:underline t)))
+  "Face for JavaScript warnings."
+  :group 'js2-mode)
+
+(defface js2-error
+  `((((class color) (background light))
+     (:foreground "red"))
+    (((class color) (background dark))
+     (:foreground "red"))
+    (t (:foreground "red")))
+  "Face for JavaScript errors."
+  :group 'js2-mode)
+
+(defface js2-jsdoc-tag
+  '((t :foreground "SlateGray"))
+  "Face used to highlight @whatever tags in jsdoc comments."
+  :group 'js2-mode)
+
+(defface js2-jsdoc-type
+  '((t :foreground "SteelBlue"))
+  "Face used to highlight {FooBar} types in jsdoc comments."
+  :group 'js2-mode)
+
+(defface js2-jsdoc-value
+  '((t :foreground "PeachPuff3"))
+  "Face used to highlight tag values in jsdoc comments."
+  :group 'js2-mode)
+
+(defface js2-function-param
+  '((t :foreground "SeaGreen"))
+  "Face used to highlight function parameters in javascript."
+  :group 'js2-mode)
+
+(defface js2-function-call
+  '((t :inherit default))
+  "Face used to highlight function name in calls."
+  :group 'js2-mode)
+
+(defface js2-instance-member
+  '((t :foreground "DarkOrchid"))
+  "Face used to highlight instance variables in javascript.
+Not currently used."
+  :group 'js2-mode)
+
+(defface js2-private-member
+  '((t :foreground "PeachPuff3"))
+  "Face used to highlight calls to private methods in javascript.
+Not currently used."
+  :group 'js2-mode)
+
+(defface js2-private-function-call
+  '((t :foreground "goldenrod"))
+  "Face used to highlight calls to private functions in javascript.
+Not currently used."
+  :group 'js2-mode)
+
+(defface js2-jsdoc-html-tag-name
+  '((((class color) (min-colors 88) (background light))
+     (:foreground "rosybrown"))
+    (((class color) (min-colors 8) (background dark))
+     (:foreground "yellow"))
+    (((class color) (min-colors 8) (background light))
+     (:foreground "magenta")))
+    "Face used to highlight jsdoc html tag names"
+  :group 'js2-mode)
+
+(defface js2-jsdoc-html-tag-delimiter
+  '((((class color) (min-colors 88) (background light))
+     (:foreground "dark khaki"))
+    (((class color) (min-colors 8) (background dark))
+     (:foreground "green"))
+    (((class color) (min-colors 8) (background light))
+     (:foreground "green")))
+  "Face used to highlight brackets in jsdoc html tags."
+  :group 'js2-mode)
+
+(defface js2-external-variable
+  '((t :foreground "orange"))
+  "Face used to highlight undeclared variable identifiers.")
+
+(defcustom js2-init-hook nil
+  "List of functions to be called after `js2-mode' or
+`js2-minor-mode' has initialized all variables, before parsing
+the buffer for the first time."
+  :type 'hook
+  :group 'js2-mode
+  :version "20130608")
+
+(defcustom js2-post-parse-callbacks nil
+  "List of callback functions invoked after parsing finishes.
+Currently, the main use for this function is to add synthetic
+declarations to `js2-recorded-identifiers', which see."
+  :type 'hook
+  :group 'js2-mode)
+
+(defcustom js2-build-imenu-callbacks nil
+  "List of functions called during Imenu index generation.
+It's a good place to add additional entries to it, using
+`js2-record-imenu-entry'."
+  :type 'hook
+  :group 'js2-mode)
+
+(defcustom js2-highlight-external-variables t
+  "Non-nil to highlight undeclared variable identifiers.
+An undeclared variable is any variable not declared with var or let
+in the current scope or any lexically enclosing scope.  If you use
+such a variable, then you are either expecting it to originate from
+another file, or you've got a potential bug."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defcustom js2-include-jslint-globals t
+  "Non-nil to include the identifiers from JSLint global
+declaration (see http://www.jslint.com/lint.html#global) in the
+buffer-local externs list.  See `js2-additional-externs' for more
+information."
+  :type 'boolean
+  :group 'js2-mode)
+
+(defvar js2-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [mouse-1] #'js2-mode-show-node)
+    (define-key map (kbd "M-j") #'js2-line-break)
+    (define-key map (kbd "C-c C-e") #'js2-mode-hide-element)
+    (define-key map (kbd "C-c C-s") #'js2-mode-show-element)
+    (define-key map (kbd "C-c C-a") #'js2-mode-show-all)
+    (define-key map (kbd "C-c C-f") #'js2-mode-toggle-hide-functions)
+    (define-key map (kbd "C-c C-t") #'js2-mode-toggle-hide-comments)
+    (define-key map (kbd "C-c C-o") #'js2-mode-toggle-element)
+    (define-key map (kbd "C-c C-w") #'js2-mode-toggle-warnings-and-errors)
+    (define-key map [down-mouse-3] #'js2-down-mouse-3)
+    (when js2-bounce-indent-p
+      (define-key map (kbd "<backtab>") #'js2-indent-bounce-backwards))
+
+    (define-key map [menu-bar javascript]
+      (cons "JavaScript" (make-sparse-keymap "JavaScript")))
+
+    (define-key map [menu-bar javascript customize-js2-mode]
+      '(menu-item "Customize js2-mode" js2-mode-customize
+                  :help "Customize the behavior of this mode"))
+
+    (define-key map [menu-bar javascript js2-force-refresh]
+      '(menu-item "Force buffer refresh" js2-mode-reset
+                  :help "Re-parse the buffer from scratch"))
+
+    (define-key map [menu-bar javascript separator-2]
+      '("--"))
+
+    (define-key map [menu-bar javascript next-error]
+      '(menu-item "Next warning or error" next-error
+                  :enabled (and js2-mode-ast
+                                (or (js2-ast-root-errors js2-mode-ast)
+                                    (js2-ast-root-warnings js2-mode-ast)))
+                  :help "Move to next warning or error"))
+
+    (define-key map [menu-bar javascript display-errors]
+      '(menu-item "Show errors and warnings" js2-mode-display-warnings-and-errors
+                  :visible (not js2-mode-show-parse-errors)
+                  :help "Turn on display of warnings and errors"))
+
+    (define-key map [menu-bar javascript hide-errors]
+      '(menu-item "Hide errors and warnings" js2-mode-hide-warnings-and-errors
+                  :visible js2-mode-show-parse-errors
+                  :help "Turn off display of warnings and errors"))
+
+    (define-key map [menu-bar javascript separator-1]
+      '("--"))
+
+    (define-key map [menu-bar javascript js2-toggle-function]
+      '(menu-item "Show/collapse element" js2-mode-toggle-element
+                  :help "Hide or show function body or comment"))
+
+    (define-key map [menu-bar javascript show-comments]
+      '(menu-item "Show block comments" js2-mode-toggle-hide-comments
+                  :visible js2-mode-comments-hidden
+                  :help "Expand all hidden block comments"))
+
+    (define-key map [menu-bar javascript hide-comments]
+      '(menu-item "Hide block comments" js2-mode-toggle-hide-comments
+                  :visible (not js2-mode-comments-hidden)
+                  :help "Show block comments as /*...*/"))
+
+    (define-key map [menu-bar javascript show-all-functions]
+      '(menu-item "Show function bodies" js2-mode-toggle-hide-functions
+                  :visible js2-mode-functions-hidden
+                  :help "Expand all hidden function bodies"))
+
+    (define-key map [menu-bar javascript hide-all-functions]
+      '(menu-item "Hide function bodies" js2-mode-toggle-hide-functions
+                  :visible (not js2-mode-functions-hidden)
+                  :help "Show {...} for all top-level function bodies"))
+
+    map)
+  "Keymap used in `js2-mode' buffers.")
+
+(defconst js2-mode-identifier-re "[[:alpha:]_$][[:alnum:]_$]*")
+
+(defvar js2-mode-//-comment-re "^\\(\\s-*\\)//.+"
+  "Matches a //-comment line.  Must be first non-whitespace on line.
+First match-group is the leading whitespace.")
+
+(defvar js2-mode-hook nil)
+
+(js2-deflocal js2-mode-ast nil "Private variable.")
+(js2-deflocal js2-mode-parse-timer nil "Private variable.")
+(js2-deflocal js2-mode-buffer-dirty-p nil "Private variable.")
+(js2-deflocal js2-mode-parsing nil "Private variable.")
+(js2-deflocal js2-mode-node-overlay nil)
+
+(defvar js2-mode-show-overlay js2-mode-dev-mode-p
+  "Debug:  Non-nil to highlight AST nodes on mouse-down.")
+
+(js2-deflocal js2-mode-fontifications nil "Private variable")
+(js2-deflocal js2-mode-deferred-properties nil "Private variable")
+(js2-deflocal js2-imenu-recorder nil "Private variable")
+(js2-deflocal js2-imenu-function-map nil "Private variable")
+
+(defvar js2-paragraph-start
+  "\\(@[[:alpha:]]+\\>\\|$\\)")
+
+;; Note that we also set a 'c-in-sws text property in html comments,
+;; so that `c-forward-sws' and `c-backward-sws' work properly.
+(defvar js2-syntactic-ws-start
+  "\\s \\|/[*/]\\|[\n\r]\\|\\\\[\n\r]\\|\\s!\\|<!--\\|^\\s-*-->")
+
+(defvar js2-syntactic-ws-end
+  "\\s \\|[\n\r/]\\|\\s!")
+
+(defvar js2-syntactic-eol
+  (concat "\\s *\\(/\\*[^*\n\r]*"
+          "\\(\\*+[^*\n\r/][^*\n\r]*\\)*"
+          "\\*+/\\s *\\)*"
+          "\\(//\\|/\\*[^*\n\r]*"
+          "\\(\\*+[^*\n\r/][^*\n\r]*\\)*$"
+          "\\|\\\\$\\|$\\)")
+  "Copied from `java-mode'.  Needed for some cc-engine functions.")
+
+(defvar js2-comment-prefix-regexp
+  "//+\\|\\**")
+
+(defvar js2-comment-start-skip
+  "\\(//+\\|/\\*+\\)\\s *")
+
+(defvar js2-mode-verbose-parse-p js2-mode-dev-mode-p
+  "Non-nil to emit status messages during parsing.")
+
+(defvar js2-mode-functions-hidden nil "Private variable.")
+(defvar js2-mode-comments-hidden nil "Private variable.")
+
+(defvar js2-mode-syntax-table
+  (let ((table (make-syntax-table)))
+    (c-populate-syntax-table table)
+    table)
+  "Syntax table used in `js2-mode' buffers.")
+
+(defvar js2-mode-abbrev-table nil
+  "Abbrev table in use in `js2-mode' buffers.")
+(define-abbrev-table 'js2-mode-abbrev-table ())
+
+(defvar js2-mode-pending-parse-callbacks nil
+  "List of functions waiting to be notified that parse is finished.")
+
+(defvar js2-mode-last-indented-line -1)
+
+;;; Localizable error and warning messages
+
+;; Messages are copied from Rhino's Messages.properties.
+;; Many of the Java-specific messages have been elided.
+;; Add any js2-specific ones at the end, so we can keep
+;; this file synced with changes to Rhino's.
+
+(defvar js2-message-table
+  (make-hash-table :test 'equal :size 250)
+  "Contains localized messages for `js2-mode'.")
+
+;; TODO(stevey):  construct this table at compile-time.
+(defmacro js2-msg (key &rest strings)
+  `(puthash ,key (concat ,@strings)
+            js2-message-table))
+
+(defun js2-get-msg (msg-key)
+  "Look up a localized message.
+MSG-KEY is a list of (MSG ARGS).  If the message takes parameters,
+the correct number of ARGS must be provided."
+  (let* ((key (if (listp msg-key) (car msg-key) msg-key))
+         (args (if (listp msg-key) (cdr msg-key)))
+         (msg (gethash key js2-message-table)))
+    (if msg
+        (apply #'format msg args)
+      key)))  ; default to showing the key
+
+(js2-msg "msg.dup.parms"
+         "Duplicate parameter name '%s'.")
+
+(js2-msg "msg.too.big.jump"
+         "Program too complex: jump offset too big.")
+
+(js2-msg "msg.too.big.index"
+         "Program too complex: internal index exceeds 64K limit.")
+
+(js2-msg "msg.while.compiling.fn"
+         "Encountered code generation error while compiling function '%s': %s")
+
+(js2-msg "msg.while.compiling.script"
+         "Encountered code generation error while compiling script: %s")
+
+;; Context
+(js2-msg "msg.ctor.not.found"
+         "Constructor for '%s' not found.")
+
+(js2-msg "msg.not.ctor"
+         "'%s' is not a constructor.")
+
+;; FunctionObject
+(js2-msg "msg.varargs.ctor"
+         "Method or constructor '%s' must be static "
+         "with the signature (Context cx, Object[] args, "
+         "Function ctorObj, boolean inNewExpr) "
+         "to define a variable arguments constructor.")
+
+(js2-msg "msg.varargs.fun"
+         "Method '%s' must be static with the signature "
+         "(Context cx, Scriptable thisObj, Object[] args, Function funObj) "
+         "to define a variable arguments function.")
+
+(js2-msg "msg.incompat.call"
+         "Method '%s' called on incompatible object.")
+
+(js2-msg "msg.bad.parms"
+         "Unsupported parameter type '%s' in method '%s'.")
+
+(js2-msg "msg.bad.method.return"
+         "Unsupported return type '%s' in method '%s'.")
+
+(js2-msg "msg.bad.ctor.return"
+         "Construction of objects of type '%s' is not supported.")
+
+(js2-msg "msg.no.overload"
+         "Method '%s' occurs multiple times in class '%s'.")
+
+(js2-msg "msg.method.not.found"
+         "Method '%s' not found in '%s'.")
+
+;; IRFactory
+
+(js2-msg "msg.bad.for.in.lhs"
+         "Invalid left-hand side of for..in loop.")
+
+(js2-msg "msg.mult.index"
+         "Only one variable allowed in for..in loop.")
+
+(js2-msg "msg.bad.for.in.destruct"
+         "Left hand side of for..in loop must be an array of "
+         "length 2 to accept key/value pair.")
+
+(js2-msg "msg.cant.convert"
+         "Can't convert to type '%s'.")
+
+(js2-msg "msg.bad.assign.left"
+         "Invalid assignment left-hand side.")
+
+(js2-msg "msg.bad.decr"
+         "Invalid decerement operand.")
+
+(js2-msg "msg.bad.incr"
+         "Invalid increment operand.")
+
+(js2-msg "msg.bad.yield"
+         "yield must be in a function.")
+
+(js2-msg "msg.yield.parenthesized"
+         "yield expression must be parenthesized.")
+
+;; NativeGlobal
+(js2-msg "msg.cant.call.indirect"
+          "Function '%s' must be called directly, and not by way of a "
+          "function of another name.")
+
+(js2-msg "msg.eval.nonstring"
+          "Calling eval() with anything other than a primitive "
+          "string value will simply return the value. "
+          "Is this what you intended?")
+
+(js2-msg "msg.eval.nonstring.strict"
+         "Calling eval() with anything other than a primitive "
+         "string value is not allowed in strict mode.")
+
+(js2-msg "msg.bad.destruct.op"
+         "Invalid destructuring assignment operator")
+
+;; NativeCall
+(js2-msg "msg.only.from.new"
+         "'%s' may only be invoked from a `new' expression.")
+
+(js2-msg "msg.deprec.ctor"
+         "The '%s' constructor is deprecated.")
+
+;; NativeFunction
+(js2-msg "msg.no.function.ref.found"
+         "no source found to decompile function reference %s")
+
+(js2-msg "msg.arg.isnt.array"
+         "second argument to Function.prototype.apply must be an array")
+
+;; NativeGlobal
+(js2-msg "msg.bad.esc.mask"
+         "invalid string escape mask")
+
+;; NativeRegExp
+(js2-msg "msg.bad.quant"
+  "Invalid quantifier %s")
+
+(js2-msg "msg.overlarge.backref"
+  "Overly large back reference %s")
+
+(js2-msg "msg.overlarge.min"
+  "Overly large minimum %s")
+
+(js2-msg "msg.overlarge.max"
+  "Overly large maximum %s")
+
+(js2-msg "msg.zero.quant"
+  "Zero quantifier %s")
+
+(js2-msg "msg.max.lt.min"
+  "Maximum %s less than minimum")
+
+(js2-msg "msg.unterm.quant"
+  "Unterminated quantifier %s")
+
+(js2-msg "msg.unterm.paren"
+  "Unterminated parenthetical %s")
+
+(js2-msg "msg.unterm.class"
+  "Unterminated character class %s")
+
+(js2-msg "msg.bad.range"
+  "Invalid range in character class.")
+
+(js2-msg "msg.trail.backslash"
+  "Trailing \\ in regular expression.")
+
+(js2-msg "msg.re.unmatched.right.paren"
+  "unmatched ) in regular expression.")
+
+(js2-msg "msg.no.regexp"
+  "Regular expressions are not available.")
+
+(js2-msg "msg.bad.backref"
+  "back-reference exceeds number of capturing parentheses.")
+
+(js2-msg "msg.bad.regexp.compile"
+         "Only one argument may be specified if the first "
+         "argument to RegExp.prototype.compile is a RegExp object.")
+
+;; Parser
+(js2-msg "msg.got.syntax.errors"
+         "Compilation produced %s syntax errors.")
+
+(js2-msg "msg.var.redecl"
+         "TypeError: redeclaration of var %s.")
+
+(js2-msg "msg.const.redecl"
+         "TypeError: redeclaration of const %s.")
+
+(js2-msg "msg.let.redecl"
+         "TypeError: redeclaration of variable %s.")
+
+(js2-msg "msg.parm.redecl"
+         "TypeError: redeclaration of formal parameter %s.")
+
+(js2-msg "msg.fn.redecl"
+         "TypeError: redeclaration of function %s.")
+
+(js2-msg "msg.let.decl.not.in.block"
+         "SyntaxError: let declaration not directly within block")
+
+(js2-msg "msg.mod.import.decl.at.top.level"
+         "SyntaxError: import declarations may only appear at the top level")
+
+(js2-msg "msg.mod.as.after.reserved.word"
+         "SyntaxError: missing keyword 'as' after reserved word %s")
+
+(js2-msg "msg.mod.rc.after.import.spec.list"
+         "SyntaxError: missing '}' after module specifier list")
+
+(js2-msg "msg.mod.from.after.import.spec.set"
+         "SyntaxError: missing keyword 'from' after import specifier set")
+
+(js2-msg "msg.mod.declaration.after.import"
+         "SyntaxError: missing declaration after 'import' keyword")
+
+(js2-msg "msg.mod.spec.after.from"
+         "SyntaxError: missing module specifier after 'from' keyword")
+
+(js2-msg "msg.mod.export.decl.at.top.level"
+         "SyntaxError: export declarations may only appear at top level")
+
+(js2-msg "msg.mod.rc.after.export.spec.list"
+         "SyntaxError: missing '}' after export specifier list")
+
+;; NodeTransformer
+(js2-msg "msg.dup.label"
+         "duplicated label")
+
+(js2-msg "msg.undef.label"
+         "undefined label")
+
+(js2-msg "msg.bad.break"
+         "unlabelled break must be inside loop or switch")
+
+(js2-msg "msg.continue.outside"
+         "continue must be inside loop")
+
+(js2-msg "msg.continue.nonloop"
+         "continue can only use labels of iteration statements")
+
+(js2-msg "msg.bad.throw.eol"
+         "Line terminator is not allowed between the throw "
+         "keyword and throw expression.")
+
+(js2-msg "msg.unnamed.function.stmt" ; added by js2-mode
+         "function statement requires a name")
+
+(js2-msg "msg.no.paren.parms"
+         "missing ( before function parameters.")
+
+(js2-msg "msg.no.parm"
+         "missing formal parameter")
+
+(js2-msg "msg.no.paren.after.parms"
+         "missing ) after formal parameters")
+
+(js2-msg "msg.no.default.after.default.param" ; added by js2-mode
+         "parameter without default follows parameter with default")
+
+(js2-msg "msg.param.after.rest" ; added by js2-mode
+         "parameter after rest parameter")
+
+(js2-msg "msg.bad.arrow.args" ; added by js2-mode
+         "invalid arrow-function arguments (parentheses around the arrow-function may help)")
+
+(js2-msg "msg.no.brace.body"
+         "missing '{' before function body")
+
+(js2-msg "msg.no.brace.after.body"
+         "missing } after function body")
+
+(js2-msg "msg.no.paren.cond"
+         "missing ( before condition")
+
+(js2-msg "msg.no.paren.after.cond"
+         "missing ) after condition")
+
+(js2-msg "msg.no.semi.stmt"
+         "missing ; before statement")
+
+(js2-msg "msg.missing.semi"
+         "missing ; after statement")
+
+(js2-msg "msg.no.name.after.dot"
+         "missing name after . operator")
+
+(js2-msg "msg.no.name.after.coloncolon"
+         "missing name after :: operator")
+
+(js2-msg "msg.no.name.after.dotdot"
+         "missing name after .. operator")
+
+(js2-msg "msg.no.name.after.xmlAttr"
+         "missing name after .@")
+
+(js2-msg "msg.no.bracket.index"
+         "missing ] in index expression")
+
+(js2-msg "msg.no.paren.switch"
+         "missing ( before switch expression")
+
+(js2-msg "msg.no.paren.after.switch"
+         "missing ) after switch expression")
+
+(js2-msg "msg.no.brace.switch"
+         "missing '{' before switch body")
+
+(js2-msg "msg.bad.switch"
+         "invalid switch statement")
+
+(js2-msg "msg.no.colon.case"
+         "missing : after case expression")
+
+(js2-msg "msg.double.switch.default"
+         "double default label in the switch statement")
+
+(js2-msg "msg.no.while.do"
+         "missing while after do-loop body")
+
+(js2-msg "msg.no.paren.for"
+         "missing ( after for")
+
+(js2-msg "msg.no.semi.for"
+         "missing ; after for-loop initializer")
+
+(js2-msg "msg.no.semi.for.cond"
+         "missing ; after for-loop condition")
+
+(js2-msg "msg.in.after.for.name"
+         "missing in or of after for")
+
+(js2-msg "msg.no.paren.for.ctrl"
+         "missing ) after for-loop control")
+
+(js2-msg "msg.no.paren.with"
+         "missing ( before with-statement object")
+
+(js2-msg "msg.no.paren.after.with"
+         "missing ) after with-statement object")
+
+(js2-msg "msg.no.paren.after.let"
+         "missing ( after let")
+
+(js2-msg "msg.no.paren.let"
+         "missing ) after variable list")
+
+(js2-msg "msg.no.curly.let"
+         "missing } after let statement")
+
+(js2-msg "msg.bad.return"
+         "invalid return")
+
+(js2-msg "msg.no.brace.block"
+         "missing } in compound statement")
+
+(js2-msg "msg.bad.label"
+         "invalid label")
+
+(js2-msg "msg.bad.var"
+         "missing variable name")
+
+(js2-msg "msg.bad.var.init"
+         "invalid variable initialization")
+
+(js2-msg "msg.no.colon.cond"
+         "missing : in conditional expression")
+
+(js2-msg "msg.no.paren.arg"
+         "missing ) after argument list")
+
+(js2-msg "msg.no.bracket.arg"
+         "missing ] after element list")
+
+(js2-msg "msg.bad.prop"
+         "invalid property id")
+
+(js2-msg "msg.no.colon.prop"
+         "missing : after property id")
+
+(js2-msg "msg.no.brace.prop"
+         "missing } after property list")
+
+(js2-msg "msg.no.paren"
+         "missing ) in parenthetical")
+
+(js2-msg "msg.reserved.id"
+         "'%s' is a reserved identifier")
+
+(js2-msg "msg.no.paren.catch"
+         "missing ( before catch-block condition")
+
+(js2-msg "msg.bad.catchcond"
+         "invalid catch block condition")
+
+(js2-msg "msg.catch.unreachable"
+         "any catch clauses following an unqualified catch are unreachable")
+
+(js2-msg "msg.no.brace.try"
+         "missing '{' before try block")
+
+(js2-msg "msg.no.brace.catchblock"
+         "missing '{' before catch-block body")
+
+(js2-msg "msg.try.no.catchfinally"
+         "'try' without 'catch' or 'finally'")
+
+(js2-msg "msg.no.return.value"
+         "function %s does not always return a value")
+
+(js2-msg "msg.anon.no.return.value"
+         "anonymous function does not always return a value")
+
+(js2-msg "msg.return.inconsistent"
+         "return statement is inconsistent with previous usage")
+
+(js2-msg "msg.generator.returns"
+         "TypeError: legacy generator function '%s' returns a value")
+
+(js2-msg "msg.anon.generator.returns"
+         "TypeError: anonymous legacy generator function returns a value")
+
+(js2-msg "msg.syntax"
+         "syntax error")
+
+(js2-msg "msg.unexpected.eof"
+         "Unexpected end of file")
+
+(js2-msg "msg.XML.bad.form"
+         "illegally formed XML syntax")
+
+(js2-msg "msg.XML.not.available"
+         "XML runtime not available")
+
+(js2-msg "msg.too.deep.parser.recursion"
+         "Too deep recursion while parsing")
+
+(js2-msg "msg.no.side.effects"
+         "Code has no side effects")
+
+(js2-msg "msg.extra.trailing.comma"
+         "Trailing comma is not supported in some browsers")
+
+(js2-msg "msg.array.trailing.comma"
+         "Trailing comma yields different behavior across browsers")
+
+(js2-msg "msg.equal.as.assign"
+         (concat "Test for equality (==) mistyped as assignment (=)?"
+                 " (parenthesize to suppress warning)"))
+
+(js2-msg "msg.var.hides.arg"
+         "Variable %s hides argument")
+
+(js2-msg "msg.destruct.assign.no.init"
+         "Missing = in destructuring declaration")
+
+;; ScriptRuntime
+(js2-msg "msg.no.properties"
+         "%s has no properties.")
+
+(js2-msg "msg.invalid.iterator"
+         "Invalid iterator value")
+
+(js2-msg "msg.iterator.primitive"
+         "__iterator__ returned a primitive value")
+
+(js2-msg "msg.assn.create.strict"
+         "Assignment to undeclared variable %s")
+
+(js2-msg "msg.undeclared.variable"  ; added by js2-mode
+         "Undeclared variable or function '%s'")
+
+(js2-msg "msg.ref.undefined.prop"
+         "Reference to undefined property '%s'")
+
+(js2-msg "msg.prop.not.found"
+         "Property %s not found.")
+
+(js2-msg "msg.invalid.type"
+         "Invalid JavaScript value of type %s")
+
+(js2-msg "msg.primitive.expected"
+         "Primitive type expected (had %s instead)")
+
+(js2-msg "msg.namespace.expected"
+         "Namespace object expected to left of :: (found %s instead)")
+
+(js2-msg "msg.null.to.object"
+         "Cannot convert null to an object.")
+
+(js2-msg "msg.undef.to.object"
+         "Cannot convert undefined to an object.")
+
+(js2-msg "msg.cyclic.value"
+         "Cyclic %s value not allowed.")
+
+(js2-msg "msg.is.not.defined"
+         "'%s' is not defined.")
+
+(js2-msg "msg.undef.prop.read"
+         "Cannot read property '%s' from %s")
+
+(js2-msg "msg.undef.prop.write"
+         "Cannot set property '%s' of %s to '%s'")
+
+(js2-msg "msg.undef.prop.delete"
+         "Cannot delete property '%s' of %s")
+
+(js2-msg "msg.undef.method.call"
+         "Cannot call method '%s' of %s")
+
+(js2-msg "msg.undef.with"
+         "Cannot apply 'with' to %s")
+
+(js2-msg "msg.isnt.function"
+         "%s is not a function, it is %s.")
+
+(js2-msg "msg.isnt.function.in"
+         "Cannot call property %s in object %s. "
+         "It is not a function, it is '%s'.")
+
+(js2-msg "msg.function.not.found"
+         "Cannot find function %s.")
+
+(js2-msg "msg.function.not.found.in"
+         "Cannot find function %s in object %s.")
+
+(js2-msg "msg.isnt.xml.object"
+         "%s is not an xml object.")
+
+(js2-msg "msg.no.ref.to.get"
+         "%s is not a reference to read reference value.")
+
+(js2-msg "msg.no.ref.to.set"
+         "%s is not a reference to set reference value to %s.")
+
+(js2-msg "msg.no.ref.from.function"
+         "Function %s can not be used as the left-hand "
+         "side of assignment or as an operand of ++ or -- operator.")
+
+(js2-msg "msg.bad.default.value"
+         "Object's getDefaultValue() method returned an object.")
+
+(js2-msg "msg.instanceof.not.object"
+         "Can't use instanceof on a non-object.")
+
+(js2-msg "msg.instanceof.bad.prototype"
+         "'prototype' property of %s is not an object.")
+
+(js2-msg "msg.bad.radix"
+         "illegal radix %s.")
+
+;; ScriptableObject
+(js2-msg "msg.default.value"
+         "Cannot find default value for object.")
+
+(js2-msg "msg.zero.arg.ctor"
+         "Cannot load class '%s' which has no zero-parameter constructor.")
+
+(js2-msg "msg.ctor.multiple.parms"
+         "Can't define constructor or class %s since more than "
+         "one constructor has multiple parameters.")
+
+(js2-msg "msg.extend.scriptable"
+         "%s must extend ScriptableObject in order to define property %s.")
+
+(js2-msg "msg.bad.getter.parms"
+         "In order to define a property, getter %s must have zero "
+         "parameters or a single ScriptableObject parameter.")
+
+(js2-msg "msg.obj.getter.parms"
+         "Expected static or delegated getter %s to take "
+         "a ScriptableObject parameter.")
+
+(js2-msg "msg.getter.static"
+         "Getter and setter must both be static or neither be static.")
+
+(js2-msg "msg.setter.return"
+         "Setter must have void return type: %s")
+
+(js2-msg "msg.setter2.parms"
+         "Two-parameter setter must take a ScriptableObject as "
+         "its first parameter.")
+
+(js2-msg "msg.setter1.parms"
+         "Expected single parameter setter for %s")
+
+(js2-msg "msg.setter2.expected"
+         "Expected static or delegated setter %s to take two parameters.")
+
+(js2-msg "msg.setter.parms"
+         "Expected either one or two parameters for setter.")
+
+(js2-msg "msg.setter.bad.type"
+         "Unsupported parameter type '%s' in setter '%s'.")
+
+(js2-msg "msg.add.sealed"
+         "Cannot add a property to a sealed object: %s.")
+
+(js2-msg "msg.remove.sealed"
+         "Cannot remove a property from a sealed object: %s.")
+
+(js2-msg "msg.modify.sealed"
+         "Cannot modify a property of a sealed object: %s.")
+
+(js2-msg "msg.modify.readonly"
+         "Cannot modify readonly property: %s.")
+
+;; TokenStream
+(js2-msg "msg.missing.exponent"
+         "missing exponent")
+
+(js2-msg "msg.caught.nfe"
+         "number format error")
+
+(js2-msg "msg.unterminated.string.lit"
+         "unterminated string literal")
+
+(js2-msg "msg.unterminated.comment"
+         "unterminated comment")
+
+(js2-msg "msg.unterminated.re.lit"
+         "unterminated regular expression literal")
+
+(js2-msg "msg.invalid.re.flag"
+         "invalid flag after regular expression")
+
+(js2-msg "msg.no.re.input.for"
+         "no input for %s")
+
+(js2-msg "msg.illegal.character"
+         "illegal character")
+
+(js2-msg "msg.invalid.escape"
+         "invalid Unicode escape sequence")
+
+(js2-msg "msg.bad.namespace"
+         "not a valid default namespace statement. "
+         "Syntax is: default xml namespace = EXPRESSION;")
+
+;; TokensStream warnings
+(js2-msg "msg.bad.octal.literal"
+         "illegal octal literal digit %s; "
+         "interpreting it as a decimal digit")
+
+(js2-msg "msg.missing.hex.digits"
+         "missing hexadecimal digits after '0x'")
+
+(js2-msg "msg.missing.binary.digits"
+         "missing binary digits after '0b'")
+
+(js2-msg "msg.missing.octal.digits"
+         "missing octal digits after '0o'")
+
+(js2-msg "msg.script.is.not.constructor"
+         "Script objects are not constructors.")
+
+;; Arrays
+(js2-msg "msg.arraylength.bad"
+         "Inappropriate array length.")
+
+;; Arrays
+(js2-msg "msg.arraylength.too.big"
+         "Array length %s exceeds supported capacity limit.")
+
+;; URI
+(js2-msg "msg.bad.uri"
+         "Malformed URI sequence.")
+
+;; Number
+(js2-msg "msg.bad.precision"
+         "Precision %s out of range.")
+
+;; NativeGenerator
+(js2-msg "msg.send.newborn"
+         "Attempt to send value to newborn generator")
+
+(js2-msg "msg.already.exec.gen"
+         "Already executing generator")
+
+(js2-msg "msg.StopIteration.invalid"
+         "StopIteration may not be changed to an arbitrary object.")
+
+;; Interpreter
+(js2-msg "msg.yield.closing"
+         "Yield from closing generator")
+
+;; Classes
+(js2-msg "msg.unnamed.class.stmt" ; added by js2-mode
+         "class statement requires a name")
+
+(js2-msg "msg.class.unexpected.comma" ; added by js2-mode
+         "unexpected ',' between class properties")
+
+(js2-msg "msg.unexpected.static" ; added by js2-mode
+         "unexpected 'static'")
+
+(js2-msg "msg.missing.extends" ; added by js2-mode
+         "name is required after extends")
+
+(js2-msg "msg.no.brace.class" ; added by js2-mode
+         "missing '{' before class body")
+
+(js2-msg "msg.missing.computed.rb" ; added by js2-mode
+         "missing ']' after computed property expression")
+
+;;; Tokens Buffer
+
+(defconst js2-ti-max-lookahead 2)
+(defconst js2-ti-ntokens (1+ js2-ti-max-lookahead))
+
+(defun js2-new-token (offset)
+  (let ((token (make-js2-token (+ offset js2-ts-cursor))))
+    (setq js2-ti-tokens-cursor (mod (1+ js2-ti-tokens-cursor) js2-ti-ntokens))
+    (aset js2-ti-tokens js2-ti-tokens-cursor token)
+    token))
+
+(defsubst js2-current-token ()
+  (aref js2-ti-tokens js2-ti-tokens-cursor))
+
+(defsubst js2-current-token-string ()
+  (js2-token-string (js2-current-token)))
+
+(defsubst js2-current-token-type ()
+  (js2-token-type (js2-current-token)))
+
+(defsubst js2-current-token-beg ()
+  (js2-token-beg (js2-current-token)))
+
+(defsubst js2-current-token-end ()
+  (js2-token-end (js2-current-token)))
+
+(defun js2-current-token-len ()
+  (let ((token (js2-current-token)))
+    (- (js2-token-end token)
+       (js2-token-beg token))))
+
+(defun js2-ts-seek (state)
+  (setq js2-ts-lineno (js2-ts-state-lineno state)
+        js2-ts-cursor (js2-ts-state-cursor state)
+        js2-ti-tokens (js2-ts-state-tokens state)
+        js2-ti-tokens-cursor (js2-ts-state-tokens-cursor state)
+        js2-ti-lookahead (js2-ts-state-lookahead state)))
+
+;;; Utilities
+
+(defun js2-delete-if (predicate list)
+  "Remove all items satisfying PREDICATE in LIST."
+  (cl-loop for item in list
+           if (not (funcall predicate item))
+           collect item))
+
+(defun js2-position (element list)
+  "Find 0-indexed position of ELEMENT in LIST comparing with `eq'.
+Returns nil if element is not found in the list."
+  (let ((count 0)
+        found)
+    (while (and list (not found))
+      (if (eq element (car list))
+          (setq found t)
+        (setq count (1+ count)
+              list (cdr list))))
+    (if found count)))
+
+(defun js2-find-if (predicate list)
+  "Find first item satisfying PREDICATE in LIST."
+  (let (result)
+    (while (and list (not result))
+      (if (funcall predicate (car list))
+          (setq result (car list)))
+      (setq list (cdr list)))
+    result))
+
+(defmacro js2-time (form)
+  "Evaluate FORM, discard result, and return elapsed time in sec."
+  (declare (debug t))
+  (let ((beg (make-symbol "--js2-time-beg--"))
+        (delta (make-symbol "--js2-time-end--")))
+    `(let ((,beg (current-time))
+           ,delta)
+       ,form
+       (/ (truncate (* (- (float-time (current-time))
+                          (float-time ,beg))
+                       10000))
+          10000.0))))
+
+(defsubst js2-same-line (pos)
+  "Return t if POS is on the same line as current point."
+  (and (>= pos (point-at-bol))
+       (<= pos (point-at-eol))))
+
+(defun js2-code-bug ()
+  "Signal an error when we encounter an unexpected code path."
+  (error "failed assertion"))
+
+(defsubst js2-record-text-property (beg end prop value)
+  "Record a text property to set when parsing finishes."
+  (push (list beg end prop value) js2-mode-deferred-properties))
+
+;; I'd like to associate errors with nodes, but for now the
+;; easiest thing to do is get the context info from the last token.
+(defun js2-record-parse-error (msg &optional arg pos len)
+  (push (list (list msg arg)
+              (or pos (js2-current-token-beg))
+              (or len (js2-current-token-len)))
+        js2-parsed-errors))
+
+(defun js2-report-error (msg &optional msg-arg pos len)
+  "Signal a syntax error or record a parse error."
+  (if js2-recover-from-parse-errors
+      (js2-record-parse-error msg msg-arg pos len)
+  (signal 'js2-syntax-error
+          (list msg
+                js2-ts-lineno
+                (save-excursion
+                  (goto-char js2-ts-cursor)
+                  (current-column))
+                js2-ts-hit-eof))))
+
+(defun js2-report-warning (msg &optional msg-arg pos len face)
+  (if js2-compiler-report-warning-as-error
+      (js2-report-error msg msg-arg pos len)
+    (push (list (list msg msg-arg)
+                (or pos (js2-current-token-beg))
+                (or len (js2-current-token-len))
+                face)
+          js2-parsed-warnings)))
+
+(defun js2-add-strict-warning (msg-id &optional msg-arg beg end)
+  (if js2-compiler-strict-mode
+      (js2-report-warning msg-id msg-arg beg
+                          (and beg end (- end beg)))))
+
+(put 'js2-syntax-error 'error-conditions
+     '(error syntax-error js2-syntax-error))
+(put 'js2-syntax-error 'error-message "Syntax error")
+
+(put 'js2-parse-error 'error-conditions
+     '(error parse-error js2-parse-error))
+(put 'js2-parse-error 'error-message "Parse error")
+
+(defmacro js2-clear-flag (flags flag)
+  `(setq ,flags (logand ,flags (lognot ,flag))))
+
+(defmacro js2-set-flag (flags flag)
+  "Logical-or FLAG into FLAGS."
+  `(setq ,flags (logior ,flags ,flag)))
+
+(defsubst js2-flag-set-p (flags flag)
+  (/= 0 (logand flags flag)))
+
+(defsubst js2-flag-not-set-p (flags flag)
+  (zerop (logand flags flag)))
+
+(defmacro js2-with-underscore-as-word-syntax (&rest body)
+  "Evaluate BODY with the _ character set to be word-syntax."
+  (declare (indent 0) (debug t))
+  (let ((old-syntax (make-symbol "old-syntax")))
+  `(let ((,old-syntax (string (char-syntax ?_))))
+     (unwind-protect
+         (progn
+           (modify-syntax-entry ?_ "w" js2-mode-syntax-table)
+           ,@body)
+       (modify-syntax-entry ?_ ,old-syntax js2-mode-syntax-table)))))
+
+;;; AST struct and function definitions
+
+;; flags for ast node property 'member-type (used for e4x operators)
+(defvar js2-property-flag    #x1 "Property access: element is valid name.")
+(defvar js2-attribute-flag   #x2 "address@hidden or address@hidden")
+(defvar js2-descendants-flag #x4 "x..y or address@hidden")
+
+(defsubst js2-relpos (pos anchor)
+  "Convert POS to be relative to ANCHOR.
+If POS is nil, returns nil."
+  (and pos (- pos anchor)))
+
+(defun js2-make-pad (indent)
+  (if (zerop indent)
+      ""
+    (make-string (* indent js2-basic-offset) ? )))
+
+(defun js2-visit-ast (node callback)
+  "Visit every node in ast NODE with visitor CALLBACK.
+
+CALLBACK is a function that takes two arguments:  (NODE END-P).  It is
+called twice:  once to visit the node, and again after all the node's
+children have been processed.  The END-P argument is nil on the first
+call and non-nil on the second call.  The return value of the callback
+affects the traversal:  if non-nil, the children of NODE are processed.
+If the callback returns nil, or if the node has no children, then the
+callback is called immediately with a non-nil END-P argument.
+
+The node traversal is approximately lexical-order, although there
+are currently no guarantees around this."
+  (when node
+    (let ((vfunc (get (aref node 0) 'js2-visitor)))
+      ;; visit the node
+      (when  (funcall callback node nil)
+        ;; visit the kids
+        (cond
+         ((eq vfunc 'js2-visit-none)
+          nil)                            ; don't even bother calling it
+         ;; Each AST node type has to define a `js2-visitor' function
+         ;; that takes a node and a callback, and calls `js2-visit-ast'
+         ;; on each child of the node.
+         (vfunc
+          (funcall vfunc node callback))
+         (t
+          (error "%s does not define a visitor-traversal function"
+                 (aref node 0)))))
+      ;; call the end-visit
+      (funcall callback node t))))
+
+(cl-defstruct (js2-node
+               (:constructor nil))  ; abstract
+  "Base AST node type."
+  (type -1)  ; token type
+  (pos -1)   ; start position of this AST node in parsed input
+  (len 1)    ; num characters spanned by the node
+  props      ; optional node property list (an alist)
+  parent)    ; link to parent node; null for root
+
+(defsubst js2-node-get-prop (node prop &optional default)
+  (or (cadr (assoc prop (js2-node-props node))) default))
+
+(defsubst js2-node-set-prop (node prop value)
+  (setf (js2-node-props node)
+        (cons (list prop value) (js2-node-props node))))
+
+(defun js2-fixup-starts (n nodes)
+  "Adjust the start positions of NODES to be relative to N.
+Any node in the list may be nil, for convenience."
+  (dolist (node nodes)
+    (when node
+      (setf (js2-node-pos node) (- (js2-node-pos node)
+                                   (js2-node-pos n))))))
+
+(defun js2-node-add-children (parent &rest nodes)
+  "Set parent node of NODES to PARENT, and return PARENT.
+Does nothing if we're not recording parent links.
+If any given node in NODES is nil, doesn't record that link."
+  (js2-fixup-starts parent nodes)
+  (dolist (node nodes)
+    (and node
+         (setf (js2-node-parent node) parent))))
+
+;; Non-recursive since it's called a frightening number of times.
+(defun js2-node-abs-pos (n)
+  (let ((pos (js2-node-pos n)))
+    (while (setq n (js2-node-parent n))
+      (setq pos (+ pos (js2-node-pos n))))
+    pos))
+
+(defsubst js2-node-abs-end (n)
+  "Return absolute buffer position of end of N."
+  (+ (js2-node-abs-pos n) (js2-node-len n)))
+
+;; It's important to make sure block nodes have a Lisp list for the
+;; child nodes, to limit printing recursion depth in an AST that
+;; otherwise consists of defstruct vectors.  Emacs will crash printing
+;; a sufficiently large vector tree.
+
+(cl-defstruct (js2-block-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-block-node (&key (type js2-BLOCK)
+                                                       (pos (js2-current-token-beg))
+                                                       len
+                                                       props
+                                                       kids)))
+  "A block of statements."
+  kids)  ; a Lisp list of the child statement nodes
+
+(put 'cl-struct-js2-block-node 'js2-visitor 'js2-visit-block)
+(put 'cl-struct-js2-block-node 'js2-printer 'js2-print-block)
+
+(defun js2-visit-block (ast callback)
+  "Visit the `js2-block-node' children of AST."
+  (dolist (kid (js2-block-node-kids ast))
+    (js2-visit-ast kid callback)))
+
+(defun js2-print-block (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad "{\n")
+    (dolist (kid (js2-block-node-kids n))
+      (js2-print-ast kid (1+ i)))
+    (insert pad "}")))
+
+(cl-defstruct (js2-scope
+               (:include js2-block-node)
+               (:constructor nil)
+               (:constructor make-js2-scope (&key (type js2-BLOCK)
+                                                  (pos (js2-current-token-beg))
+                                                  len
+                                                  kids)))
+  ;; The symbol-table is a LinkedHashMap<String,Symbol> in Rhino.
+  ;; I don't have one of those handy, so I'll use an alist for now.
+  ;; It's as fast as an emacs hashtable for up to about 50 elements,
+  ;; and is much lighter-weight to construct (both CPU and mem).
+  ;; The keys are interned strings (symbols) for faster lookup.
+  ;; Should switch to hybrid alist/hashtable eventually.
+  symbol-table  ; an alist of (symbol . js2-symbol)
+  parent-scope  ; a `js2-scope'
+  top)          ; top-level `js2-scope' (script/function)
+
+(put 'cl-struct-js2-scope 'js2-visitor 'js2-visit-block)
+(put 'cl-struct-js2-scope 'js2-printer 'js2-print-none)
+
+(defun js2-node-get-enclosing-scope (node)
+  "Return the innermost `js2-scope' node surrounding NODE.
+Returns nil if there is no enclosing scope node."
+  (let ((parent (js2-node-parent node)))
+    (while (not (js2-scope-p parent))
+      (setq parent (js2-node-parent parent)))
+    parent))
+
+(defun js2-get-defining-scope (scope name)
+  "Search up scope chain from SCOPE looking for NAME, a string or symbol.
+Returns `js2-scope' in which NAME is defined, or nil if not found."
+  (let ((sym (if (symbolp name)
+                 name
+               (intern name)))
+        table
+        result
+        (continue t))
+    (while (and scope continue)
+      (if (or
+           (and (setq table (js2-scope-symbol-table scope))
+                (assq sym table))
+           (and (eq sym 'arguments)
+                (js2-function-node-p scope)))
+          (setq continue nil
+                result scope)
+        (setq scope (js2-scope-parent-scope scope))))
+    result))
+
+(defun js2-scope-get-symbol (scope name)
+  "Return symbol table entry for NAME in SCOPE.
+NAME can be a string or symbol.   Returns a `js2-symbol' or nil if not found."
+  (and (js2-scope-symbol-table scope)
+       (cdr (assq (if (symbolp name)
+                      name
+                    (intern name))
+                  (js2-scope-symbol-table scope)))))
+
+(defun js2-scope-put-symbol (scope name symbol)
+  "Enter SYMBOL into symbol-table for SCOPE under NAME.
+NAME can be a Lisp symbol or string.  SYMBOL is a `js2-symbol'."
+  (let* ((table (js2-scope-symbol-table scope))
+         (sym (if (symbolp name) name (intern name)))
+         (entry (assq sym table)))
+    (if entry
+        (setcdr entry symbol)
+      (push (cons sym symbol)
+            (js2-scope-symbol-table scope)))))
+
+(cl-defstruct (js2-symbol
+               (:constructor nil)
+               (:constructor make-js2-symbol (decl-type name &optional ast-node)))
+  "A symbol table entry."
+  ;; One of js2-FUNCTION, js2-LP (for parameters), js2-VAR,
+  ;; js2-LET, or js2-CONST
+  decl-type
+  name  ; string
+  ast-node) ; a `js2-node'
+
+(cl-defstruct (js2-error-node
+               (:include js2-node)
+               (:constructor nil) ; silence emacs21 byte-compiler
+               (:constructor make-js2-error-node (&key (type js2-ERROR)
+                                                       (pos (js2-current-token-beg))
+                                                       len)))
+  "AST node representing a parse error.")
+
+(put 'cl-struct-js2-error-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-error-node 'js2-printer 'js2-print-none)
+
+(cl-defstruct (js2-script-node
+               (:include js2-scope)
+               (:constructor nil)
+               (:constructor make-js2-script-node (&key (type js2-SCRIPT)
+                                                        (pos (js2-current-token-beg))
+                                                        len
+                                                        ;; FIXME: What are those?
+                                                        var-decls
+                                                        fun-decls)))
+  functions   ; Lisp list of nested functions
+  regexps     ; Lisp list of (string . flags)
+  symbols     ; alist (every symbol gets unique index)
+  (param-count 0)
+  var-names   ; vector of string names
+  consts      ; bool-vector matching var-decls
+  (temp-number 0))  ; for generating temp variables
+
+(put 'cl-struct-js2-script-node 'js2-visitor 'js2-visit-block)
+(put 'cl-struct-js2-script-node 'js2-printer 'js2-print-script)
+
+(defun js2-print-script (node indent)
+  (dolist (kid (js2-block-node-kids node))
+    (js2-print-ast kid indent)))
+
+(cl-defstruct (js2-ast-root
+               (:include js2-script-node)
+               (:constructor nil)
+               (:constructor make-js2-ast-root (&key (type js2-SCRIPT)
+                                                     (pos (js2-current-token-beg))
+                                                     len
+                                                     buffer)))
+  "The root node of a js2 AST."
+  buffer         ; the source buffer from which the code was parsed
+  comments       ; a Lisp list of comments, ordered by start position
+  errors         ; a Lisp list of errors found during parsing
+  warnings       ; a Lisp list of warnings found during parsing
+  node-count)    ; number of nodes in the tree, including the root
+
+(put 'cl-struct-js2-ast-root 'js2-visitor 'js2-visit-ast-root)
+(put 'cl-struct-js2-ast-root 'js2-printer 'js2-print-script)
+
+(defun js2-visit-ast-root (ast callback)
+  (dolist (kid (js2-ast-root-kids ast))
+    (js2-visit-ast kid callback))
+  (dolist (comment (js2-ast-root-comments ast))
+    (js2-visit-ast comment callback)))
+
+(cl-defstruct (js2-comment-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-comment-node (&key (type js2-COMMENT)
+                                                         (pos (js2-current-token-beg))
+                                                         len
+                                                         format)))
+  format)  ; 'line, 'block, 'jsdoc or 'html
+
+(put 'cl-struct-js2-comment-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-comment-node 'js2-printer 'js2-print-comment)
+
+(defun js2-print-comment (n i)
+  ;; We really ought to link end-of-line comments to their nodes.
+  ;; Or maybe we could add a new comment type, 'endline.
+  (insert (js2-make-pad i)
+          (js2-node-string n)))
+
+(cl-defstruct (js2-expr-stmt-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-expr-stmt-node (&key (type js2-EXPR_VOID)
+                                                           (pos js2-ts-cursor)
+                                                           len
+                                                           expr)))
+  "An expression statement."
+  expr)
+
+(defsubst js2-expr-stmt-node-set-has-result (node)
+  "Change NODE type to `js2-EXPR_RESULT'.  Used for code generation."
+  (setf (js2-node-type node) js2-EXPR_RESULT))
+
+(put 'cl-struct-js2-expr-stmt-node 'js2-visitor 'js2-visit-expr-stmt-node)
+(put 'cl-struct-js2-expr-stmt-node 'js2-printer 'js2-print-expr-stmt-node)
+
+(defun js2-visit-expr-stmt-node (n v)
+  (js2-visit-ast (js2-expr-stmt-node-expr n) v))
+
+(defun js2-print-expr-stmt-node (n indent)
+  (js2-print-ast (js2-expr-stmt-node-expr n) indent)
+  (insert ";\n"))
+
+(cl-defstruct (js2-loop-node
+               (:include js2-scope)
+               (:constructor nil))
+  "Abstract supertype of loop nodes."
+  body      ; a `js2-block-node'
+  lp        ; position of left-paren, nil if omitted
+  rp)       ; position of right-paren, nil if omitted
+
+(cl-defstruct (js2-do-node
+               (:include js2-loop-node)
+               (:constructor nil)
+               (:constructor make-js2-do-node (&key (type js2-DO)
+                                                    (pos (js2-current-token-beg))
+                                                    len
+                                                    body
+                                                    condition
+                                                    while-pos
+                                                    lp
+                                                    rp)))
+  "AST node for do-loop."
+  condition  ; while (expression)
+  while-pos) ; buffer position of 'while' keyword
+
+(put 'cl-struct-js2-do-node 'js2-visitor 'js2-visit-do-node)
+(put 'cl-struct-js2-do-node 'js2-printer 'js2-print-do-node)
+
+(defun js2-visit-do-node (n v)
+  (js2-visit-ast (js2-do-node-body n) v)
+  (js2-visit-ast (js2-do-node-condition n) v))
+
+(defun js2-print-do-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad "do {\n")
+    (dolist (kid (js2-block-node-kids (js2-do-node-body n)))
+      (js2-print-ast kid (1+ i)))
+    (insert pad "} while (")
+    (js2-print-ast (js2-do-node-condition n) 0)
+    (insert ");\n")))
+
+(cl-defstruct (js2-export-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-export-node (&key (type js2-EXPORT)
+                                                        (pos) (js2-current-token-beg)
+                                                        len
+                                                        exports-list
+                                                        from-clause
+                                                        declaration
+                                                        default)))
+  "AST node for an export statement. There are many things that can be exported,
+so many of its properties will be nil.
+"
+  exports-list ; lisp list of js2-export-binding-node to export
+  from-clause ; js2-from-clause-node for re-exporting symbols from another module
+  declaration ; js2-var-decl-node (var, let, const) or js2-class-node
+  default) ; js2-function-node or js2-assign-node
+
+(put 'cl-struct-js2-export-node 'js2-visitor 'js2-visit-export-node)
+(put 'cl-struct-js2-export-node 'js2-printer 'js2-print-export-node)
+
+(defun js2-visit-export-node (n v)
+  (let ((exports-list (js2-export-node-exports-list n))
+        (from (js2-export-node-from-clause n))
+        (declaration (js2-export-node-declaration n))
+        (default (js2-export-node-default n)))
+    (when exports-list
+      (dolist (export exports-list)
+        (js2-visit-ast export v)))
+    (when from
+      (js2-visit-ast from v))
+    (when declaration
+      (js2-visit-ast declaration v))
+    (when default
+      (js2-visit-ast default v))))
+
+(defun js2-print-export-node (n i)
+  (let ((pad (js2-make-pad i))
+        (exports-list (js2-export-node-exports-list n))
+        (from (js2-export-node-from-clause n))
+        (declaration (js2-export-node-declaration n))
+        (default (js2-export-node-default n)))
+    (insert pad "export ")
+    (cond
+     (default
+       (insert "default ")
+       (js2-print-ast default i))
+     (declaration
+       (js2-print-ast declaration i))
+     ((and exports-list from)
+      (js2-print-named-imports exports-list)
+      (insert " ")
+      (js2-print-from-clause from))
+     (from
+      (insert "* ")
+      (js2-print-from-clause from))
+     (exports-list
+      (js2-print-named-imports exports-list)))
+    (insert ";\n")))
+
+(cl-defstruct (js2-while-node
+               (:include js2-loop-node)
+               (:constructor nil)
+               (:constructor make-js2-while-node (&key (type js2-WHILE)
+                                                       (pos (js2-current-token-beg))
+                                                       len body
+                                                       condition lp
+                                                       rp)))
+  "AST node for while-loop."
+  condition)    ; while-condition
+
+(put 'cl-struct-js2-while-node 'js2-visitor 'js2-visit-while-node)
+(put 'cl-struct-js2-while-node 'js2-printer 'js2-print-while-node)
+
+(defun js2-visit-while-node (n v)
+  (js2-visit-ast (js2-while-node-condition n) v)
+  (js2-visit-ast (js2-while-node-body n) v))
+
+(defun js2-print-while-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad "while (")
+    (js2-print-ast (js2-while-node-condition n) 0)
+    (insert ") {\n")
+    (js2-print-body (js2-while-node-body n) (1+ i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-for-node
+               (:include js2-loop-node)
+               (:constructor nil)
+               (:constructor make-js2-for-node (&key (type js2-FOR)
+                                                     (pos js2-ts-cursor)
+                                                     len body init
+                                                     condition
+                                                     update lp rp)))
+  "AST node for a C-style for-loop."
+  init       ; initialization expression
+  condition  ; loop condition
+  update)    ; update clause
+
+(put 'cl-struct-js2-for-node 'js2-visitor 'js2-visit-for-node)
+(put 'cl-struct-js2-for-node 'js2-printer 'js2-print-for-node)
+
+(defun js2-visit-for-node (n v)
+  (js2-visit-ast (js2-for-node-init n) v)
+  (js2-visit-ast (js2-for-node-condition n) v)
+  (js2-visit-ast (js2-for-node-update n) v)
+  (js2-visit-ast (js2-for-node-body n) v))
+
+(defun js2-print-for-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad "for (")
+    (js2-print-ast (js2-for-node-init n) 0)
+    (insert "; ")
+    (js2-print-ast (js2-for-node-condition n) 0)
+    (insert "; ")
+    (js2-print-ast (js2-for-node-update n) 0)
+    (insert ") {\n")
+    (js2-print-body (js2-for-node-body n) (1+ i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-for-in-node
+               (:include js2-loop-node)
+               (:constructor nil)
+               (:constructor make-js2-for-in-node (&key (type js2-FOR)
+                                                        (pos js2-ts-cursor)
+                                                        len body
+                                                        iterator
+                                                        object
+                                                        in-pos
+                                                        each-pos
+                                                        foreach-p forof-p
+                                                        lp rp)))
+  "AST node for a for..in loop."
+  iterator  ; [var] foo in ...
+  object    ; object over which we're iterating
+  in-pos    ; buffer position of 'in' keyword
+  each-pos  ; buffer position of 'each' keyword, if foreach-p
+  foreach-p ; t if it's a for-each loop
+  forof-p)  ; t if it's a for-of loop
+
+(put 'cl-struct-js2-for-in-node 'js2-visitor 'js2-visit-for-in-node)
+(put 'cl-struct-js2-for-in-node 'js2-printer 'js2-print-for-in-node)
+
+(defun js2-visit-for-in-node (n v)
+  (js2-visit-ast (js2-for-in-node-iterator n) v)
+  (js2-visit-ast (js2-for-in-node-object n) v)
+  (js2-visit-ast (js2-for-in-node-body n) v))
+
+(defun js2-print-for-in-node (n i)
+  (let ((pad (js2-make-pad i))
+        (foreach (js2-for-in-node-foreach-p n))
+        (forof (js2-for-in-node-forof-p n)))
+    (insert pad "for ")
+    (if foreach
+        (insert "each "))
+    (insert "(")
+    (js2-print-ast (js2-for-in-node-iterator n) 0)
+    (insert (if forof " of " " in "))
+    (js2-print-ast (js2-for-in-node-object n) 0)
+    (insert ") {\n")
+    (js2-print-body (js2-for-in-node-body n) (1+ i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-return-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-return-node (&key (type js2-RETURN)
+                                                        (pos js2-ts-cursor)
+                                                        len
+                                                        retval)))
+  "AST node for a return statement."
+  retval)  ; expression to return, or 'undefined
+
+(put 'cl-struct-js2-return-node 'js2-visitor 'js2-visit-return-node)
+(put 'cl-struct-js2-return-node 'js2-printer 'js2-print-return-node)
+
+(defun js2-visit-return-node (n v)
+  (js2-visit-ast (js2-return-node-retval n) v))
+
+(defun js2-print-return-node (n i)
+  (insert (js2-make-pad i) "return")
+  (when (js2-return-node-retval n)
+    (insert " ")
+    (js2-print-ast (js2-return-node-retval n) 0))
+  (insert ";\n"))
+
+(cl-defstruct (js2-if-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-if-node (&key (type js2-IF)
+                                                    (pos js2-ts-cursor)
+                                                    len condition
+                                                    then-part
+                                                    else-pos
+                                                    else-part lp
+                                                    rp)))
+  "AST node for an if-statement."
+  condition   ; expression
+  then-part   ; statement or block
+  else-pos    ; optional buffer position of 'else' keyword
+  else-part   ; optional statement or block
+  lp          ; position of left-paren, nil if omitted
+  rp)         ; position of right-paren, nil if omitted
+
+(put 'cl-struct-js2-if-node 'js2-visitor 'js2-visit-if-node)
+(put 'cl-struct-js2-if-node 'js2-printer 'js2-print-if-node)
+
+(defun js2-visit-if-node (n v)
+  (js2-visit-ast (js2-if-node-condition n) v)
+  (js2-visit-ast (js2-if-node-then-part n) v)
+  (js2-visit-ast (js2-if-node-else-part n) v))
+
+(defun js2-print-if-node (n i)
+  (let ((pad (js2-make-pad i))
+        (then-part (js2-if-node-then-part n))
+        (else-part (js2-if-node-else-part n)))
+    (insert pad "if (")
+    (js2-print-ast (js2-if-node-condition n) 0)
+    (insert ") {\n")
+    (js2-print-body then-part (1+ i))
+    (insert pad "}")
+    (cond
+     ((not else-part)
+      (insert "\n"))
+     ((js2-if-node-p else-part)
+      (insert " else ")
+      (js2-print-body else-part i))
+     (t
+      (insert " else {\n")
+      (js2-print-body else-part (1+ i))
+      (insert pad "}\n")))))
+
+(cl-defstruct (js2-export-binding-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-export-binding-node (&key (type -1)
+                                                                pos
+                                                                len
+                                                                local-name
+                                                                extern-name)))
+  "AST node for an external symbol binding.
+It contains a local-name node which is the name of the value in the
+current scope, and extern-name which is the name of the value in the
+imported or exported scope. By default these are the same, but if the
+name is aliased as in {foo as bar}, it would have an extern-name node
+containing 'foo' and a local-name node containing 'bar'."
+  local-name ; js2-name-node with the variable name in this scope
+  extern-name)   ; js2-name-node with the value name in the exporting module
+
+(put 'cl-struct-js2-export-binding-node 'js2-printer 'js2-print-extern-binding)
+(put 'cl-struct-js2-export-binding-node 'js2-visitor 'js2-visit-extern-binding)
+
+(defun js2-visit-extern-binding (n v)
+  "Visit an extern binding node. First visit the local-name, and, if
+different, visit the extern-name."
+  (let ((local-name (js2-export-binding-node-local-name n))
+        (extern-name (js2-export-binding-node-extern-name n)))
+    (when local-name
+      (js2-visit-ast local-name v))
+    (when (not (equal local-name extern-name))
+      (js2-visit-ast extern-name v))))
+
+(defun js2-print-extern-binding (n i)
+  "Print a representation of a single extern binding. E.g. 'foo' or
+'foo as bar'."
+  (let ((local-name (js2-export-binding-node-local-name n))
+        (extern-name (js2-export-binding-node-extern-name n)))
+    (insert (js2-name-node-name extern-name))
+    (when (not (equal local-name extern-name))
+      (insert " as ")
+      (insert (js2-name-node-name local-name)))))
+
+
+(cl-defstruct (js2-import-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-import-node (&key (type js2-IMPORT)
+                                                        (pos (js2-current-token-beg))
+                                                        len
+                                                        import
+                                                        from
+                                                        module-id)))
+  "AST node for an import statement. It follows the form
+
+import ModuleSpecifier;
+import ImportClause FromClause;"
+  import     ; js2-import-clause-node specifying which names are to imported.
+  from       ; js2-from-clause-node indicating the module from which to import.
+  module-id) ; module-id of the import. E.g. 'src/mylib'.
+
+(put 'cl-struct-js2-import-node 'js2-printer 'js2-print-import)
+(put 'cl-struct-js2-import-node 'js2-visitor 'js2-visit-import)
+
+(defun js2-visit-import (n v)
+  (let ((import-clause (js2-import-node-import n))
+        (from-clause (js2-import-node-from n)))
+    (when import-clause
+      (js2-visit-ast import-clause v))
+    (when from-clause
+      (js2-visit-ast from-clause v))))
+
+(defun js2-print-import (n i)
+  "Prints a representation of the import node"
+  (let ((pad (js2-make-pad i))
+        (import-clause (js2-import-node-import n))
+        (from-clause (js2-import-node-from n))
+        (module-id (js2-import-node-module-id n)))
+    (insert pad "import ")
+    (if import-clause
+        (progn
+          (js2-print-import-clause import-clause)
+          (insert " ")
+          (js2-print-from-clause from-clause))
+      (insert "'")
+      (insert module-id)
+      (insert "'"))
+    (insert ";\n")))
+
+(cl-defstruct (js2-import-clause-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-import-clause-node (&key (type -1)
+                                                               pos
+                                                               len
+                                                               namespace-import
+                                                               named-imports
+                                                               default-binding)))
+  "AST node corresponding to the import clause of an import statement. This is
+the portion of the import that bindings names from the external context to the
+local context."
+  namespace-import ; js2-namespace-import-node. E.g. '* as lib'
+  named-imports    ; lisp list of js2-export-binding-node for all named imports.
+  default-binding) ; js2-export-binding-node for the default import binding
+
+(put 'cl-struct-js2-import-clause-node 'js2-visitor 'js2-visit-import-clause)
+(put 'cl-struct-js2-import-clause-node 'js2-printer 'js2-print-import-clause)
+
+(defun js2-visit-import-clause (n v)
+  (let ((ns-import (js2-import-clause-node-namespace-import n))
+        (named-imports (js2-import-clause-node-named-imports n))
+        (default (js2-import-clause-node-default-binding n)))
+    (when ns-import
+      (js2-visit-ast ns-import v))
+    (when named-imports
+      (dolist (import named-imports)
+        (js2-visit-ast import v)))
+    (when default
+      (js2-visit-ast default v))))
+
+(defun js2-print-import-clause (n)
+  (let ((ns-import (js2-import-clause-node-namespace-import n))
+        (named-imports (js2-import-clause-node-named-imports n))
+        (default (js2-import-clause-node-default-binding n)))
+    (cond
+     ((and default ns-import)
+      (js2-print-ast default)
+      (insert ", ")
+      (js2-print-namespace-import ns-import))
+     ((and default named-imports)
+      (js2-print-ast default)
+      (insert ", ")
+      (js2-print-named-imports named-imports))
+     (default
+      (js2-print-ast default))
+     (ns-import
+      (js2-print-namespace-import ns-import))
+     (named-imports
+      (js2-print-named-imports named-imports)))))
+
+(defun js2-print-namespace-import (node)
+  (insert "* as ")
+  (insert (js2-name-node-name (js2-namespace-import-node-name node))))
+
+(defun js2-print-named-imports (imports)
+  (insert "{")
+  (let ((len (length imports))
+        (n 0))
+    (while (< n len)
+      (js2-print-extern-binding (nth n imports) 0)
+      (unless (= n (- len 1))
+        (insert ", "))
+      (setq n (+ n 1))))
+  (insert "}"))
+
+(cl-defstruct (js2-namespace-import-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-namespace-import-node (&key (type -1)
+                                                                  pos
+                                                                  len
+                                                                  name)))
+  "AST node for a complete namespace import.
+E.g. the '* as lib' expression in:
+
+import * as lib from 'src/lib'
+
+It contains a single name node referring to the bound name."
+  name) ; js2-name-node of the bound name.
+
+(defun js2-visit-namespace-import (n v)
+  (js2-visit-ast (js2-namespace-import-node-name n) v))
+
+(put 'cl-struct-js2-namespace-import-node 'js2-visitor 'js2-visit-namespace-import)
+(put 'cl-struct-js2-namespace-import-node 'js2-printer 'js2-print-namespace-import)
+
+(cl-defstruct (js2-from-clause-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-from-clause-node (&key (type js2-NAME)
+                                                             pos
+                                                             len
+                                                             module-id
+                                                             metadata-p)))
+  "AST node for the from clause in an import or export statement.
+E.g. from 'my/module'. It can refere to either an external module, or to the
+modules metadata itself."
+  module-id ; string containing the module specifier.
+  metadata-p) ; true if this clause refers to the module's metadata
+
+(put 'cl-struct-js2-from-clause-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-from-clause-node 'js2-printer 'js2-print-from-clause)
+
+(defun js2-print-from-clause (n)
+  (insert "from ")
+  (if (js2-from-clause-node-metadata-p n)
+      (insert "this module")
+    (insert "'")
+    (insert (js2-from-clause-node-module-id n))
+    (insert "'")))
+
+(cl-defstruct (js2-try-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-try-node (&key (type js2-TRY)
+                                                     (pos js2-ts-cursor)
+                                                     len
+                                                     try-block
+                                                     catch-clauses
+                                                     finally-block)))
+  "AST node for a try-statement."
+  try-block
+  catch-clauses  ; a Lisp list of `js2-catch-node'
+  finally-block) ; a `js2-finally-node'
+
+(put 'cl-struct-js2-try-node 'js2-visitor 'js2-visit-try-node)
+(put 'cl-struct-js2-try-node 'js2-printer 'js2-print-try-node)
+
+(defun js2-visit-try-node (n v)
+  (js2-visit-ast (js2-try-node-try-block n) v)
+  (dolist (clause (js2-try-node-catch-clauses n))
+    (js2-visit-ast clause v))
+  (js2-visit-ast (js2-try-node-finally-block n) v))
+
+(defun js2-print-try-node (n i)
+  (let ((pad (js2-make-pad i))
+        (catches (js2-try-node-catch-clauses n))
+        (finally (js2-try-node-finally-block n)))
+    (insert pad "try {\n")
+    (js2-print-body (js2-try-node-try-block n) (1+ i))
+    (insert pad "}")
+    (when catches
+      (dolist (catch catches)
+        (js2-print-ast catch i)))
+    (if finally
+        (js2-print-ast finally i)
+      (insert "\n"))))
+
+(cl-defstruct (js2-catch-node
+               (:include js2-scope)
+               (:constructor nil)
+               (:constructor make-js2-catch-node (&key (type js2-CATCH)
+                                                       (pos js2-ts-cursor)
+                                                       len
+                                                       param
+                                                       guard-kwd
+                                                       guard-expr
+                                                       lp rp)))
+  "AST node for a catch clause."
+  param       ; destructuring form or simple name node
+  guard-kwd   ; relative buffer position of "if" in "catch (x if ...)"
+  guard-expr  ; catch condition, a `js2-node'
+  lp          ; buffer position of left-paren, nil if omitted
+  rp)         ; buffer position of right-paren, nil if omitted
+
+(put 'cl-struct-js2-catch-node 'js2-visitor 'js2-visit-catch-node)
+(put 'cl-struct-js2-catch-node 'js2-printer 'js2-print-catch-node)
+
+(defun js2-visit-catch-node (n v)
+  (js2-visit-ast (js2-catch-node-param n) v)
+  (when (js2-catch-node-guard-kwd n)
+    (js2-visit-ast (js2-catch-node-guard-expr n) v))
+  (js2-visit-block n v))
+
+(defun js2-print-catch-node (n i)
+  (let ((pad (js2-make-pad i))
+        (guard-kwd (js2-catch-node-guard-kwd n))
+        (guard-expr (js2-catch-node-guard-expr n)))
+    (insert " catch (")
+    (js2-print-ast (js2-catch-node-param n) 0)
+    (when guard-kwd
+      (insert " if ")
+      (js2-print-ast guard-expr 0))
+    (insert ") {\n")
+    (js2-print-body n (1+ i))
+    (insert pad "}")))
+
+(cl-defstruct (js2-finally-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-finally-node (&key (type js2-FINALLY)
+                                                         (pos js2-ts-cursor)
+                                                         len body)))
+  "AST node for a finally clause."
+  body)  ; a `js2-node', often but not always a block node
+
+(put 'cl-struct-js2-finally-node 'js2-visitor 'js2-visit-finally-node)
+(put 'cl-struct-js2-finally-node 'js2-printer 'js2-print-finally-node)
+
+(defun js2-visit-finally-node (n v)
+  (js2-visit-ast (js2-finally-node-body n) v))
+
+(defun js2-print-finally-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert " finally {\n")
+    (js2-print-body (js2-finally-node-body n) (1+ i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-switch-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-switch-node (&key (type js2-SWITCH)
+                                                        (pos js2-ts-cursor)
+                                                        len
+                                                        discriminant
+                                                        cases lp
+                                                        rp)))
+  "AST node for a switch statement."
+  discriminant  ; a `js2-node' (switch expression)
+  cases  ; a Lisp list of `js2-case-node'
+  lp     ; position of open-paren for discriminant, nil if omitted
+  rp)    ; position of close-paren for discriminant, nil if omitted
+
+(put 'cl-struct-js2-switch-node 'js2-visitor 'js2-visit-switch-node)
+(put 'cl-struct-js2-switch-node 'js2-printer 'js2-print-switch-node)
+
+(defun js2-visit-switch-node (n v)
+  (js2-visit-ast (js2-switch-node-discriminant n) v)
+  (dolist (c (js2-switch-node-cases n))
+    (js2-visit-ast c v)))
+
+(defun js2-print-switch-node (n i)
+  (let ((pad (js2-make-pad i))
+        (cases (js2-switch-node-cases n)))
+    (insert pad "switch (")
+    (js2-print-ast (js2-switch-node-discriminant n) 0)
+    (insert ") {\n")
+    (dolist (case cases)
+      (js2-print-ast case i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-case-node
+               (:include js2-block-node)
+               (:constructor nil)
+               (:constructor make-js2-case-node (&key (type js2-CASE)
+                                                      (pos js2-ts-cursor)
+                                                      len kids expr)))
+  "AST node for a case clause of a switch statement."
+  expr)   ; the case expression (nil for default)
+
+(put 'cl-struct-js2-case-node 'js2-visitor 'js2-visit-case-node)
+(put 'cl-struct-js2-case-node 'js2-printer 'js2-print-case-node)
+
+(defun js2-visit-case-node (n v)
+  (js2-visit-ast (js2-case-node-expr n) v)
+  (js2-visit-block n v))
+
+(defun js2-print-case-node (n i)
+  (let ((pad (js2-make-pad i))
+        (expr (js2-case-node-expr n)))
+    (insert pad)
+    (if (null expr)
+        (insert "default:\n")
+      (insert "case ")
+      (js2-print-ast expr 0)
+      (insert ":\n"))
+    (dolist (kid (js2-case-node-kids n))
+      (js2-print-ast kid (1+ i)))))
+
+(cl-defstruct (js2-throw-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-throw-node (&key (type js2-THROW)
+                                                       (pos js2-ts-cursor)
+                                                       len expr)))
+  "AST node for a throw statement."
+  expr)   ; the expression to throw
+
+(put 'cl-struct-js2-throw-node 'js2-visitor 'js2-visit-throw-node)
+(put 'cl-struct-js2-throw-node 'js2-printer 'js2-print-throw-node)
+
+(defun js2-visit-throw-node (n v)
+  (js2-visit-ast (js2-throw-node-expr n) v))
+
+(defun js2-print-throw-node (n i)
+  (insert (js2-make-pad i) "throw ")
+  (js2-print-ast (js2-throw-node-expr n) 0)
+  (insert ";\n"))
+
+(cl-defstruct (js2-with-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-with-node (&key (type js2-WITH)
+                                                      (pos js2-ts-cursor)
+                                                      len object
+                                                      body lp rp)))
+  "AST node for a with-statement."
+  object
+  body
+  lp    ; buffer position of left-paren around object, nil if omitted
+  rp)   ; buffer position of right-paren around object, nil if omitted
+
+(put 'cl-struct-js2-with-node 'js2-visitor 'js2-visit-with-node)
+(put 'cl-struct-js2-with-node 'js2-printer 'js2-print-with-node)
+
+(defun js2-visit-with-node (n v)
+  (js2-visit-ast (js2-with-node-object n) v)
+  (js2-visit-ast (js2-with-node-body n) v))
+
+(defun js2-print-with-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad "with (")
+    (js2-print-ast (js2-with-node-object n) 0)
+    (insert ") {\n")
+    (js2-print-body (js2-with-node-body n) (1+ i))
+    (insert pad "}\n")))
+
+(cl-defstruct (js2-label-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-label-node (&key (type js2-LABEL)
+                                                       (pos js2-ts-cursor)
+                                                       len name)))
+  "AST node for a statement label or case label."
+  name   ; a string
+  loop)  ; for validating and code-generating continue-to-label
+
+(put 'cl-struct-js2-label-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-label-node 'js2-printer 'js2-print-label)
+
+(defun js2-print-label (n i)
+  (insert (js2-make-pad i)
+          (js2-label-node-name n)
+          ":\n"))
+
+(cl-defstruct (js2-labeled-stmt-node
+               (:include js2-node)
+               (:constructor nil)
+               ;; type needs to be in `js2-side-effecting-tokens' to avoid spurious
+               ;; no-side-effects warnings, hence js2-EXPR_RESULT.
+               (:constructor make-js2-labeled-stmt-node (&key (type js2-EXPR_RESULT)
+                                                              (pos js2-ts-cursor)
+                                                              len labels stmt)))
+  "AST node for a statement with one or more labels.
+Multiple labels for a statement are collapsed into the labels field."
+  labels  ; Lisp list of `js2-label-node'
+  stmt)   ; the statement these labels are for
+
+(put 'cl-struct-js2-labeled-stmt-node 'js2-visitor 'js2-visit-labeled-stmt)
+(put 'cl-struct-js2-labeled-stmt-node 'js2-printer 'js2-print-labeled-stmt)
+
+(defun js2-get-label-by-name (lbl-stmt name)
+  "Return a `js2-label-node' by NAME from LBL-STMT's labels list.
+Returns nil if no such label is in the list."
+  (let ((label-list (js2-labeled-stmt-node-labels lbl-stmt))
+        result)
+    (while (and label-list (not result))
+      (if (string= (js2-label-node-name (car label-list)) name)
+          (setq result (car label-list))
+        (setq label-list (cdr label-list))))
+    result))
+
+(defun js2-visit-labeled-stmt (n v)
+  (dolist (label (js2-labeled-stmt-node-labels n))
+    (js2-visit-ast label v))
+  (js2-visit-ast (js2-labeled-stmt-node-stmt n) v))
+
+(defun js2-print-labeled-stmt (n i)
+  (dolist (label (js2-labeled-stmt-node-labels n))
+    (js2-print-ast label i))
+  (js2-print-ast (js2-labeled-stmt-node-stmt n) i))
+
+(defun js2-labeled-stmt-node-contains (node label)
+  "Return t if NODE contains LABEL in its label set.
+NODE is a `js2-labels-node'.  LABEL is an identifier."
+  (cl-loop for nl in (js2-labeled-stmt-node-labels node)
+           if (string= label (js2-label-node-name nl))
+           return t
+           finally return nil))
+
+(defsubst js2-labeled-stmt-node-add-label (node label)
+  "Add a `js2-label-node' to the label set for this statement."
+  (setf (js2-labeled-stmt-node-labels node)
+        (nconc (js2-labeled-stmt-node-labels node) (list label))))
+
+(cl-defstruct (js2-jump-node
+               (:include js2-node)
+               (:constructor nil))
+  "Abstract supertype of break and continue nodes."
+  label   ; `js2-name-node' for location of label identifier, if present
+  target) ; target js2-labels-node or loop/switch statement
+
+(defun js2-visit-jump-node (n v)
+  ;; We don't visit the target, since it's a back-link.
+  (js2-visit-ast (js2-jump-node-label n) v))
+
+(cl-defstruct (js2-break-node
+               (:include js2-jump-node)
+               (:constructor nil)
+               (:constructor make-js2-break-node (&key (type js2-BREAK)
+                                                       (pos js2-ts-cursor)
+                                                       len label target)))
+  "AST node for a break statement.
+The label field is a `js2-name-node', possibly nil, for the named label
+if provided.  E.g. in 'break foo', it represents 'foo'.  The target field
+is the target of the break - a label node or enclosing loop/switch statement.")
+
+(put 'cl-struct-js2-break-node 'js2-visitor 'js2-visit-jump-node)
+(put 'cl-struct-js2-break-node 'js2-printer 'js2-print-break-node)
+
+(defun js2-print-break-node (n i)
+  (insert (js2-make-pad i) "break")
+  (when (js2-break-node-label n)
+    (insert " ")
+    (js2-print-ast (js2-break-node-label n) 0))
+  (insert ";\n"))
+
+(cl-defstruct (js2-continue-node
+               (:include js2-jump-node)
+               (:constructor nil)
+               (:constructor make-js2-continue-node (&key (type js2-CONTINUE)
+                                                          (pos js2-ts-cursor)
+                                                          len label target)))
+  "AST node for a continue statement.
+The label field is the user-supplied enclosing label name, a `js2-name-node'.
+It is nil if continue specifies no label.  The target field is the jump target:
+a `js2-label-node' or the innermost enclosing loop.")
+
+(put 'cl-struct-js2-continue-node 'js2-visitor 'js2-visit-jump-node)
+(put 'cl-struct-js2-continue-node 'js2-printer 'js2-print-continue-node)
+
+(defun js2-print-continue-node (n i)
+  (insert (js2-make-pad i) "continue")
+  (when (js2-continue-node-label n)
+    (insert " ")
+    (js2-print-ast (js2-continue-node-label n) 0))
+  (insert ";\n"))
+
+(cl-defstruct (js2-function-node
+               (:include js2-script-node)
+               (:constructor nil)
+               (:constructor make-js2-function-node (&key (type js2-FUNCTION)
+                                                          (pos js2-ts-cursor)
+                                                          len
+                                                          (ftype 'FUNCTION)
+                                                          (form 'FUNCTION_STATEMENT)
+                                                          (name "")
+                                                          params rest-p
+                                                          body
+                                                          generator-type
+                                                          lp rp)))
+  "AST node for a function declaration.
+The `params' field is a Lisp list of nodes.  Each node is either a simple
+`js2-name-node', or if it's a destructuring-assignment parameter, a
+`js2-array-node' or `js2-object-node'."
+  ftype            ; FUNCTION, GETTER or SETTER
+  form             ; FUNCTION_{STATEMENT|EXPRESSION|ARROW}
+  name             ; function name (a `js2-name-node', or nil if anonymous)
+  params           ; a Lisp list of destructuring forms or simple name nodes
+  rest-p           ; if t, the last parameter is rest parameter
+  body             ; a `js2-block-node' or expression node (1.8 only)
+  lp               ; position of arg-list open-paren, or nil if omitted
+  rp               ; position of arg-list close-paren, or nil if omitted
+  ignore-dynamic   ; ignore value of the dynamic-scope flag (interpreter only)
+  needs-activation ; t if we need an activation object for this frame
+  generator-type   ; STAR, LEGACY, COMPREHENSION or nil
+  member-expr)     ; nonstandard Ecma extension from Rhino
+
+(put 'cl-struct-js2-function-node 'js2-visitor 'js2-visit-function-node)
+(put 'cl-struct-js2-function-node 'js2-printer 'js2-print-function-node)
+
+(defun js2-visit-function-node (n v)
+  (js2-visit-ast (js2-function-node-name n) v)
+  (dolist (p (js2-function-node-params n))
+    (js2-visit-ast p v))
+  (js2-visit-ast (js2-function-node-body n) v))
+
+(defun js2-print-function-node (n i)
+  (let* ((pad (js2-make-pad i))
+         (getter (js2-node-get-prop n 'GETTER_SETTER))
+         (name (or (js2-function-node-name n)
+                   (js2-function-node-member-expr n)))
+         (params (js2-function-node-params n))
+         (arrow (eq (js2-function-node-form n) 'FUNCTION_ARROW))
+         (rest-p (js2-function-node-rest-p n))
+         (body (js2-function-node-body n))
+         (expr (not (eq (js2-function-node-form n) 'FUNCTION_STATEMENT))))
+    (unless (or getter arrow)
+      (insert pad "function")
+      (when (eq (js2-function-node-generator-type n) 'STAR)
+        (insert "*")))
+    (when name
+      (insert " ")
+      (js2-print-ast name 0))
+    (insert "(")
+    (cl-loop with len = (length params)
+             for param in params
+             for count from 1
+             do
+             (when (and rest-p (= count len))
+               (insert "..."))
+             (js2-print-ast param 0)
+             (when (< count len)
+               (insert ", ")))
+    (insert ") ")
+    (when arrow
+      (insert "=> "))
+    (insert "{")
+    ;; TODO:  fix this to be smarter about indenting, etc.
+    (unless expr
+      (insert "\n"))
+    (if (js2-block-node-p body)
+        (js2-print-body body (1+ i))
+      (js2-print-ast body 0))
+    (insert pad "}")
+    (unless expr
+      (insert "\n"))))
+
+(defun js2-function-name (node)
+  "Return function name for NODE, a `js2-function-node', or nil if anonymous."
+  (and (js2-function-node-name node)
+       (js2-name-node-name (js2-function-node-name node))))
+
+;; Having this be an expression node makes it more flexible.
+;; There are IDE contexts, such as indentation in a for-loop initializer,
+;; that work better if you assume it's an expression.  Whenever we have
+;; a standalone var/const declaration, we just wrap with an expr stmt.
+;; Eclipse apparently screwed this up and now has two versions, expr and stmt.
+(cl-defstruct (js2-var-decl-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-var-decl-node (&key (type js2-VAR)
+                                                          (pos (js2-current-token-beg))
+                                                          len kids
+                                                          decl-type)))
+  "AST node for a variable declaration list (VAR, CONST or LET).
+The node bounds differ depending on the declaration type.  For VAR or
+CONST declarations, the bounds include the var/const keyword.  For LET
+declarations, the node begins at the position of the first child."
+  kids        ; a Lisp list of `js2-var-init-node' structs.
+  decl-type)  ; js2-VAR, js2-CONST or js2-LET
+
+(put 'cl-struct-js2-var-decl-node 'js2-visitor 'js2-visit-var-decl)
+(put 'cl-struct-js2-var-decl-node 'js2-printer 'js2-print-var-decl)
+
+(defun js2-visit-var-decl (n v)
+  (dolist (kid (js2-var-decl-node-kids n))
+    (js2-visit-ast kid v)))
+
+(defun js2-print-var-decl (n i)
+  (let ((pad (js2-make-pad i))
+        (tt (js2-var-decl-node-decl-type n)))
+    (insert pad)
+    (insert (cond
+             ((= tt js2-VAR) "var ")
+             ((= tt js2-LET) "let ")
+             ((= tt js2-CONST) "const ")
+             (t
+              (error "malformed var-decl node"))))
+    (cl-loop with kids = (js2-var-decl-node-kids n)
+             with len = (length kids)
+             for kid in kids
+             for count from 1
+             do
+             (js2-print-ast kid 0)
+             (if (< count len)
+                 (insert ", ")))))
+
+(cl-defstruct (js2-var-init-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-var-init-node (&key (type js2-VAR)
+                                                          (pos js2-ts-cursor)
+                                                          len target
+                                                          initializer)))
+  "AST node for a variable declaration.
+The type field will be js2-CONST for a const decl."
+  target        ; `js2-name-node', `js2-object-node', or `js2-array-node'
+  initializer)  ; initializer expression, a `js2-node'
+
+(put 'cl-struct-js2-var-init-node 'js2-visitor 'js2-visit-var-init-node)
+(put 'cl-struct-js2-var-init-node 'js2-printer 'js2-print-var-init-node)
+
+(defun js2-visit-var-init-node (n v)
+  (js2-visit-ast (js2-var-init-node-target n) v)
+  (js2-visit-ast (js2-var-init-node-initializer n) v))
+
+(defun js2-print-var-init-node (n i)
+  (let ((pad (js2-make-pad i))
+        (name (js2-var-init-node-target n))
+        (init (js2-var-init-node-initializer n)))
+    (insert pad)
+    (js2-print-ast name 0)
+    (when init
+      (insert " = ")
+      (js2-print-ast init 0))))
+
+(cl-defstruct (js2-cond-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-cond-node (&key (type js2-HOOK)
+                                                      (pos js2-ts-cursor)
+                                                      len
+                                                      test-expr
+                                                      true-expr
+                                                      false-expr
+                                                      q-pos c-pos)))
+  "AST node for the ternary operator"
+  test-expr
+  true-expr
+  false-expr
+  q-pos   ; buffer position of ?
+  c-pos)  ; buffer position of :
+
+(put 'cl-struct-js2-cond-node 'js2-visitor 'js2-visit-cond-node)
+(put 'cl-struct-js2-cond-node 'js2-printer 'js2-print-cond-node)
+
+(defun js2-visit-cond-node (n v)
+  (js2-visit-ast (js2-cond-node-test-expr n) v)
+  (js2-visit-ast (js2-cond-node-true-expr n) v)
+  (js2-visit-ast (js2-cond-node-false-expr n) v))
+
+(defun js2-print-cond-node (n i)
+  (let ((pad (js2-make-pad i)))
+    (insert pad)
+    (js2-print-ast (js2-cond-node-test-expr n) 0)
+    (insert " ? ")
+    (js2-print-ast (js2-cond-node-true-expr n) 0)
+    (insert " : ")
+    (js2-print-ast (js2-cond-node-false-expr n) 0)))
+
+(cl-defstruct (js2-infix-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-infix-node (&key type
+                                                       (pos js2-ts-cursor)
+                                                       len op-pos
+                                                       left right)))
+  "Represents infix expressions.
+Includes assignment ops like `|=', and the comma operator.
+The type field inherited from `js2-node' holds the operator."
+  op-pos    ; buffer position where operator begins
+  left      ; any `js2-node'
+  right)    ; any `js2-node'
+
+(put 'cl-struct-js2-infix-node 'js2-visitor 'js2-visit-infix-node)
+(put 'cl-struct-js2-infix-node 'js2-printer 'js2-print-infix-node)
+
+(defun js2-visit-infix-node (n v)
+  (js2-visit-ast (js2-infix-node-left n) v)
+  (js2-visit-ast (js2-infix-node-right n) v))
+
+(defconst js2-operator-tokens
+  (let ((table (make-hash-table :test 'eq))
+        (tokens
+         (list (cons js2-IN "in")
+               (cons js2-TYPEOF "typeof")
+               (cons js2-INSTANCEOF "instanceof")
+               (cons js2-DELPROP "delete")
+               (cons js2-COMMA ",")
+               (cons js2-COLON ":")
+               (cons js2-OR "||")
+               (cons js2-AND "&&")
+               (cons js2-INC "++")
+               (cons js2-DEC "--")
+               (cons js2-BITOR "|")
+               (cons js2-BITXOR "^")
+               (cons js2-BITAND "&")
+               (cons js2-EQ "==")
+               (cons js2-NE "!=")
+               (cons js2-LT "<")
+               (cons js2-LE "<=")
+               (cons js2-GT ">")
+               (cons js2-GE ">=")
+               (cons js2-LSH "<<")
+               (cons js2-RSH ">>")
+               (cons js2-URSH ">>>")
+               (cons js2-ADD "+")       ; infix plus
+               (cons js2-SUB "-")       ; infix minus
+               (cons js2-MUL "*")
+               (cons js2-DIV "/")
+               (cons js2-MOD "%")
+               (cons js2-NOT "!")
+               (cons js2-BITNOT "~")
+               (cons js2-POS "+")       ; unary plus
+               (cons js2-NEG "-")       ; unary minus
+               (cons js2-TRIPLEDOT "...")
+               (cons js2-SHEQ "===")    ; shallow equality
+               (cons js2-SHNE "!==")    ; shallow inequality
+               (cons js2-ASSIGN "=")
+               (cons js2-ASSIGN_BITOR "|=")
+               (cons js2-ASSIGN_BITXOR "^=")
+               (cons js2-ASSIGN_BITAND "&=")
+               (cons js2-ASSIGN_LSH "<<=")
+               (cons js2-ASSIGN_RSH ">>=")
+               (cons js2-ASSIGN_URSH ">>>=")
+               (cons js2-ASSIGN_ADD "+=")
+               (cons js2-ASSIGN_SUB "-=")
+               (cons js2-ASSIGN_MUL "*=")
+               (cons js2-ASSIGN_DIV "/=")
+               (cons js2-ASSIGN_MOD "%="))))
+    (cl-loop for (k . v) in tokens do
+             (puthash k v table))
+    table))
+
+(defun js2-print-infix-node (n i)
+  (let* ((tt (js2-node-type n))
+         (op (gethash tt js2-operator-tokens)))
+    (unless op
+      (error "unrecognized infix operator %s" (js2-node-type n)))
+    (insert (js2-make-pad i))
+    (js2-print-ast (js2-infix-node-left n) 0)
+    (unless (= tt js2-COMMA)
+      (insert " "))
+    (insert op)
+    (insert " ")
+    (js2-print-ast (js2-infix-node-right n) 0)))
+
+(cl-defstruct (js2-assign-node
+               (:include js2-infix-node)
+               (:constructor nil)
+               (:constructor make-js2-assign-node (&key type
+                                                        (pos js2-ts-cursor)
+                                                        len op-pos
+                                                        left right)))
+  "Represents any assignment.
+The type field holds the actual assignment operator.")
+
+(put 'cl-struct-js2-assign-node 'js2-visitor 'js2-visit-infix-node)
+(put 'cl-struct-js2-assign-node 'js2-printer 'js2-print-infix-node)
+
+(cl-defstruct (js2-unary-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-unary-node (&key type ; required
+                                                       (pos js2-ts-cursor)
+                                                       len operand)))
+  "AST node type for unary operator nodes.
+The type field can be NOT, BITNOT, POS, NEG, INC, DEC,
+TYPEOF, DELPROP or TRIPLEDOT.  For INC or DEC, a 'postfix node
+property is added if the operator follows the operand."
+  operand)  ; a `js2-node' expression
+
+(put 'cl-struct-js2-unary-node 'js2-visitor 'js2-visit-unary-node)
+(put 'cl-struct-js2-unary-node 'js2-printer 'js2-print-unary-node)
+
+(defun js2-visit-unary-node (n v)
+  (js2-visit-ast (js2-unary-node-operand n) v))
+
+(defun js2-print-unary-node (n i)
+  (let* ((tt (js2-node-type n))
+         (op (gethash tt js2-operator-tokens))
+         (postfix (js2-node-get-prop n 'postfix)))
+    (unless op
+      (error "unrecognized unary operator %s" tt))
+    (insert (js2-make-pad i))
+    (unless postfix
+      (insert op))
+    (if (or (= tt js2-TYPEOF)
+            (= tt js2-DELPROP))
+        (insert " "))
+    (js2-print-ast (js2-unary-node-operand n) 0)
+    (when postfix
+      (insert op))))
+
+(cl-defstruct (js2-let-node
+               (:include js2-scope)
+               (:constructor nil)
+               (:constructor make-js2-let-node (&key (type js2-LETEXPR)
+                                                     (pos (js2-current-token-beg))
+                                                     len vars body
+                                                     lp rp)))
+  "AST node for a let expression or a let statement.
+Note that a let declaration such as let x=6, y=7 is a `js2-var-decl-node'."
+  vars   ; a `js2-var-decl-node'
+  body   ; a `js2-node' representing the expression or body block
+  lp
+  rp)
+
+(put 'cl-struct-js2-let-node 'js2-visitor 'js2-visit-let-node)
+(put 'cl-struct-js2-let-node 'js2-printer 'js2-print-let-node)
+
+(defun js2-visit-let-node (n v)
+  (js2-visit-ast (js2-let-node-vars n) v)
+  (js2-visit-ast (js2-let-node-body n) v))
+
+(defun js2-print-let-node (n i)
+  (insert (js2-make-pad i) "let (")
+  (let ((p (point)))
+    (js2-print-ast (js2-let-node-vars n) 0)
+    (delete-region p (+ p 4)))
+  (insert ") ")
+  (js2-print-ast (js2-let-node-body n) i))
+
+(cl-defstruct (js2-keyword-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-keyword-node (&key type
+                                                         (pos (js2-current-token-beg))
+                                                         (len (- js2-ts-cursor pos)))))
+  "AST node representing a literal keyword such as `null'.
+Used for `null', `this', `true', `false' and `debugger'.
+The node type is set to js2-NULL, js2-THIS, etc.")
+
+(put 'cl-struct-js2-keyword-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-keyword-node 'js2-printer 'js2-print-keyword-node)
+
+(defun js2-print-keyword-node (n i)
+  (insert (js2-make-pad i)
+          (let ((tt (js2-node-type n)))
+            (cond
+             ((= tt js2-THIS) "this")
+             ((= tt js2-SUPER) "super")
+             ((= tt js2-NULL) "null")
+             ((= tt js2-TRUE) "true")
+             ((= tt js2-FALSE) "false")
+             ((= tt js2-DEBUGGER) "debugger")
+             (t (error "Invalid keyword literal type: %d" tt))))))
+
+(defsubst js2-this-or-super-node-p (node)
+  "Return t if NODE is a `js2-literal-node' of type js2-THIS or js2-SUPER."
+  (let ((type (js2-node-type node)))
+    (or (eq type js2-THIS) (eq type js2-SUPER))))
+
+(cl-defstruct (js2-new-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-new-node (&key (type js2-NEW)
+                                                     (pos (js2-current-token-beg))
+                                                     len target
+                                                     args initializer
+                                                     lp rp)))
+  "AST node for new-expression such as new Foo()."
+  target  ; an identifier or reference
+  args    ; a Lisp list of argument nodes
+  lp      ; position of left-paren, nil if omitted
+  rp      ; position of right-paren, nil if omitted
+  initializer) ; experimental Rhino syntax:  optional `js2-object-node'
+
+(put 'cl-struct-js2-new-node 'js2-visitor 'js2-visit-new-node)
+(put 'cl-struct-js2-new-node 'js2-printer 'js2-print-new-node)
+
+(defun js2-visit-new-node (n v)
+  (js2-visit-ast (js2-new-node-target n) v)
+  (dolist (arg (js2-new-node-args n))
+    (js2-visit-ast arg v))
+  (js2-visit-ast (js2-new-node-initializer n) v))
+
+(defun js2-print-new-node (n i)
+  (insert (js2-make-pad i) "new ")
+  (js2-print-ast (js2-new-node-target n))
+  (insert "(")
+  (js2-print-list (js2-new-node-args n))
+  (insert ")")
+  (when (js2-new-node-initializer n)
+    (insert " ")
+    (js2-print-ast (js2-new-node-initializer n))))
+
+(cl-defstruct (js2-name-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-name-node (&key (type js2-NAME)
+                                                      (pos (js2-current-token-beg))
+                                                      (len (- js2-ts-cursor
+                                                              (js2-current-token-beg)))
+                                                      (name (js2-current-token-string)))))
+  "AST node for a JavaScript identifier"
+  name   ; a string
+  scope) ; a `js2-scope' (optional, used for codegen)
+
+(put 'cl-struct-js2-name-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-name-node 'js2-printer 'js2-print-name-node)
+
+(defun js2-print-name-node (n i)
+  (insert (js2-make-pad i)
+          (js2-name-node-name n)))
+
+(defsubst js2-name-node-length (node)
+  "Return identifier length of NODE, a `js2-name-node'.
+Returns 0 if NODE is nil or its identifier field is nil."
+  (if node
+      (length (js2-name-node-name node))
+    0))
+
+(cl-defstruct (js2-number-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-number-node (&key (type js2-NUMBER)
+                                                        (pos (js2-current-token-beg))
+                                                        (len (- js2-ts-cursor
+                                                                (js2-current-token-beg)))
+                                                        (value (js2-current-token-string))
+                                                        (num-value (js2-token-number
+                                                                    (js2-current-token))))))
+  "AST node for a number literal."
+  value      ; the original string, e.g. "6.02e23"
+  num-value) ; the parsed number value
+
+(put 'cl-struct-js2-number-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-number-node 'js2-printer 'js2-print-number-node)
+
+(defun js2-print-number-node (n i)
+  (insert (js2-make-pad i)
+          (number-to-string (js2-number-node-num-value n))))
+
+(cl-defstruct (js2-regexp-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-regexp-node (&key (type js2-REGEXP)
+                                                        (pos (js2-current-token-beg))
+                                                        (len (- js2-ts-cursor
+                                                                (js2-current-token-beg)))
+                                                        value flags)))
+  "AST node for a regular expression literal."
+  value  ; the regexp string, without // delimiters
+  flags) ; a string of flags, e.g. `mi'.
+
+(put 'cl-struct-js2-regexp-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-regexp-node 'js2-printer 'js2-print-regexp)
+
+(defun js2-print-regexp (n i)
+  (insert (js2-make-pad i)
+          "/"
+          (js2-regexp-node-value n)
+          "/")
+  (if (js2-regexp-node-flags n)
+      (insert (js2-regexp-node-flags n))))
+
+(cl-defstruct (js2-string-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-string-node (&key (type js2-STRING)
+                                                        (pos (js2-current-token-beg))
+                                                        (len (- js2-ts-cursor
+                                                                (js2-current-token-beg)))
+                                                        (value (js2-current-token-string)))))
+  "String literal.
+Escape characters are not evaluated; e.g. \n is 2 chars in value field.
+You can tell the quote type by looking at the first character."
+  value) ; the characters of the string, including the quotes
+
+(put 'cl-struct-js2-string-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-string-node 'js2-printer 'js2-print-string-node)
+
+(defun js2-print-string-node (n i)
+  (insert (js2-make-pad i)
+          (js2-node-string n)))
+
+(cl-defstruct (js2-template-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-template-node (&key (type js2-TEMPLATE_HEAD)
+                                                          beg len kids)))
+  "Template literal."
+  kids)  ; `js2-string-node' is used for string segments, other nodes
+         ; for substitutions inside.
+
+(put 'cl-struct-js2-template-node 'js2-visitor 'js2-visit-template)
+(put 'cl-struct-js2-template-node 'js2-printer 'js2-print-template)
+
+(defun js2-visit-template (n callback)
+  (dolist (kid (js2-template-node-kids n))
+    (js2-visit-ast kid callback)))
+
+(defun js2-print-template (n i)
+  (insert (js2-make-pad i))
+  (dolist (kid (js2-template-node-kids n))
+    (if (js2-string-node-p kid)
+        (insert (js2-node-string kid))
+      (js2-print-ast kid))))
+
+(cl-defstruct (js2-tagged-template-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-tagged-template-node (&key (type js2-TAGGED_TEMPLATE)
+                                                                 beg len tag template)))
+  "Tagged template literal."
+  tag       ; `js2-node' with the tag expression.
+  template) ; `js2-template-node' with the template.
+
+(put 'cl-struct-js2-tagged-template-node 'js2-visitor 'js2-visit-tagged-template)
+(put 'cl-struct-js2-tagged-template-node 'js2-printer 'js2-print-tagged-template)
+
+(defun js2-visit-tagged-template (n callback)
+  (js2-visit-ast (js2-tagged-template-node-tag n) callback)
+  (js2-visit-ast (js2-tagged-template-node-template n) callback))
+
+(defun js2-print-tagged-template (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-tagged-template-node-tag n))
+  (js2-print-ast (js2-tagged-template-node-template n)))
+
+(cl-defstruct (js2-array-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-array-node (&key (type js2-ARRAYLIT)
+                                                       (pos js2-ts-cursor)
+                                                       len elems)))
+  "AST node for an array literal."
+  elems)  ; list of expressions.  [foo,,bar] yields a nil middle element.
+
+(put 'cl-struct-js2-array-node 'js2-visitor 'js2-visit-array-node)
+(put 'cl-struct-js2-array-node 'js2-printer 'js2-print-array-node)
+
+(defun js2-visit-array-node (n v)
+  (dolist (e (js2-array-node-elems n))
+    (js2-visit-ast e v)))  ; Can be nil; e.g. [a, ,b].
+
+(defun js2-print-array-node (n i)
+  (insert (js2-make-pad i) "[")
+  (let ((elems (js2-array-node-elems n)))
+    (js2-print-list elems)
+    (when (and elems (null (car (last elems))))
+      (insert ",")))
+  (insert "]"))
+
+(cl-defstruct (js2-class-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-class-node (&key (type js2-CLASS)
+                                                       (pos js2-ts-cursor)
+                                                       (form 'CLASS_STATEMENT)
+                                                       (name "")
+                                                       extends len elems)))
+  "AST node for an class expression.
+`elems' is a list of `js2-object-prop-node', and `extends' is an
+optional `js2-expr-node'"
+  form             ; CLASS_{STATEMENT|EXPRESSION}
+  name             ; class name (a `js2-node-name', or nil if anonymous)
+  extends          ; class heritage (a `js2-expr-node', or nil if none)
+  elems)
+
+(put 'cl-struct-js2-class-node 'js2-visitor 'js2-visit-class-node)
+(put 'cl-struct-js2-class-node 'js2-printer 'js2-print-class-node)
+
+(defun js2-visit-class-node (n v)
+  (js2-visit-ast (js2-class-node-name n) v)
+  (js2-visit-ast (js2-class-node-extends n) v)
+  (dolist (e (js2-class-node-elems n))
+    (js2-visit-ast e v)))
+
+(defun js2-print-class-node (n i)
+  (let* ((pad (js2-make-pad i))
+         (name (js2-class-node-name n))
+         (extends (js2-class-node-extends n))
+         (elems (js2-class-node-elems n)))
+    (insert pad "class")
+    (when name
+      (insert " ")
+      (js2-print-ast name 0))
+    (when extends
+      (insert " extends ")
+      (js2-print-ast extends))
+    (insert " {")
+    (dolist (elem elems)
+      (insert "\n")
+      (if (js2-node-get-prop elem 'STATIC)
+          (progn (insert (js2-make-pad (1+ i)) "static ")
+                 (js2-print-ast elem 0)) ;; TODO(sdh): indentation isn't quite right
+        (js2-print-ast elem (1+ i))))
+    (insert "\n" pad "}")))
+
+(cl-defstruct (js2-object-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-object-node (&key (type js2-OBJECTLIT)
+                                                        (pos js2-ts-cursor)
+                                                        len
+                                                        elems)))
+  "AST node for an object literal expression.
+`elems' is a list of `js2-object-prop-node'."
+  elems)
+
+(put 'cl-struct-js2-object-node 'js2-visitor 'js2-visit-object-node)
+(put 'cl-struct-js2-object-node 'js2-printer 'js2-print-object-node)
+
+(defun js2-visit-object-node (n v)
+  (dolist (e (js2-object-node-elems n))
+    (js2-visit-ast e v)))
+
+(defun js2-print-object-node (n i)
+  (insert (js2-make-pad i) "{")
+  (js2-print-list (js2-object-node-elems n))
+  (insert "}"))
+
+(cl-defstruct (js2-object-prop-node
+               (:include js2-infix-node)
+               (:constructor nil)
+               (:constructor make-js2-object-prop-node (&key (type js2-COLON)
+                                                             (pos js2-ts-cursor)
+                                                             len left
+                                                             right op-pos)))
+  "AST node for an object literal prop:value entry.
+The `left' field is the property:  a name node, string node or number node.
+The `right' field is a `js2-node' representing the initializer value.
+If the property is abbreviated, the node's `SHORTHAND' property is non-nil
+and both fields have the same value.")
+
+(put 'cl-struct-js2-object-prop-node 'js2-visitor 'js2-visit-infix-node)
+(put 'cl-struct-js2-object-prop-node 'js2-printer 'js2-print-object-prop-node)
+
+(defun js2-print-object-prop-node (n i)
+  (let* ((left (js2-object-prop-node-left n))
+         (computed (not (or (js2-string-node-p left)
+                            (js2-number-node-p left)
+                            (js2-name-node-p left)))))
+    (insert (js2-make-pad i))
+    (if computed
+        (insert "["))
+    (js2-print-ast left 0)
+    (if computed
+        (insert "]"))
+    (if (not (js2-node-get-prop n 'SHORTHAND))
+        (progn
+          (insert ": ")
+          (js2-print-ast (js2-object-prop-node-right n) 0)))))
+
+(cl-defstruct (js2-getter-setter-node
+               (:include js2-infix-node)
+               (:constructor nil)
+               (:constructor make-js2-getter-setter-node (&key type ; GET, SET, or FUNCTION
+                                                               (pos js2-ts-cursor)
+                                                               len left right)))
+  "AST node for a getter/setter property in an object literal.
+The `left' field is the `js2-name-node' naming the getter/setter prop.
+The `right' field is always an anonymous `js2-function-node' with a node
+property `GETTER_SETTER' set to js2-GET, js2-SET, or js2-FUNCTION. ")
+
+(put 'cl-struct-js2-getter-setter-node 'js2-visitor 'js2-visit-infix-node)
+(put 'cl-struct-js2-getter-setter-node 'js2-printer 'js2-print-getter-setter)
+
+(defun js2-print-getter-setter (n i)
+  (let ((pad (js2-make-pad i))
+        (left (js2-getter-setter-node-left n))
+        (right (js2-getter-setter-node-right n)))
+    (insert pad)
+    (if (/= (js2-node-type n) js2-FUNCTION)
+        (insert (if (= (js2-node-type n) js2-GET) "get " "set ")))
+    (js2-print-ast left 0)
+    (js2-print-ast right 0)))
+
+(cl-defstruct (js2-prop-get-node
+               (:include js2-infix-node)
+               (:constructor nil)
+               (:constructor make-js2-prop-get-node (&key (type js2-GETPROP)
+                                                          (pos js2-ts-cursor)
+                                                          len left right)))
+  "AST node for a dotted property reference, e.g. foo.bar or foo().bar")
+
+(put 'cl-struct-js2-prop-get-node 'js2-visitor 'js2-visit-prop-get-node)
+(put 'cl-struct-js2-prop-get-node 'js2-printer 'js2-print-prop-get-node)
+
+(defun js2-visit-prop-get-node (n v)
+  (js2-visit-ast (js2-prop-get-node-left n) v)
+  (js2-visit-ast (js2-prop-get-node-right n) v))
+
+(defun js2-print-prop-get-node (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-prop-get-node-left n) 0)
+  (insert ".")
+  (js2-print-ast (js2-prop-get-node-right n) 0))
+
+(cl-defstruct (js2-elem-get-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-elem-get-node (&key (type js2-GETELEM)
+                                                          (pos js2-ts-cursor)
+                                                          len target element
+                                                          lb rb)))
+  "AST node for an array index expression such as foo[bar]."
+  target  ; a `js2-node' - the expression preceding the "."
+  element ; a `js2-node' - the expression in brackets
+  lb      ; position of left-bracket, nil if omitted
+  rb)     ; position of right-bracket, nil if omitted
+
+(put 'cl-struct-js2-elem-get-node 'js2-visitor 'js2-visit-elem-get-node)
+(put 'cl-struct-js2-elem-get-node 'js2-printer 'js2-print-elem-get-node)
+
+(defun js2-visit-elem-get-node (n v)
+  (js2-visit-ast (js2-elem-get-node-target n) v)
+  (js2-visit-ast (js2-elem-get-node-element n) v))
+
+(defun js2-print-elem-get-node (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-elem-get-node-target n) 0)
+  (insert "[")
+  (js2-print-ast (js2-elem-get-node-element n) 0)
+  (insert "]"))
+
+(cl-defstruct (js2-call-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-call-node (&key (type js2-CALL)
+                                                      (pos js2-ts-cursor)
+                                                      len target args
+                                                      lp rp)))
+  "AST node for a JavaScript function call."
+  target  ; a `js2-node' evaluating to the function to call
+  args  ; a Lisp list of `js2-node' arguments
+  lp    ; position of open-paren, or nil if missing
+  rp)   ; position of close-paren, or nil if missing
+
+(put 'cl-struct-js2-call-node 'js2-visitor 'js2-visit-call-node)
+(put 'cl-struct-js2-call-node 'js2-printer 'js2-print-call-node)
+
+(defun js2-visit-call-node (n v)
+  (js2-visit-ast (js2-call-node-target n) v)
+  (dolist (arg (js2-call-node-args n))
+    (js2-visit-ast arg v)))
+
+(defun js2-print-call-node (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-call-node-target n) 0)
+  (insert "(")
+  (js2-print-list (js2-call-node-args n))
+  (insert ")"))
+
+(cl-defstruct (js2-yield-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-yield-node (&key (type js2-YIELD)
+                                                       (pos js2-ts-cursor)
+                                                       len value star-p)))
+  "AST node for yield statement or expression."
+  star-p ; whether it's yield*
+  value) ; optional:  value to be yielded
+
+(put 'cl-struct-js2-yield-node 'js2-visitor 'js2-visit-yield-node)
+(put 'cl-struct-js2-yield-node 'js2-printer 'js2-print-yield-node)
+
+(defun js2-visit-yield-node (n v)
+  (js2-visit-ast (js2-yield-node-value n) v))
+
+(defun js2-print-yield-node (n i)
+  (insert (js2-make-pad i))
+  (insert "yield")
+  (when (js2-yield-node-star-p n)
+    (insert "*"))
+  (when (js2-yield-node-value n)
+    (insert " ")
+    (js2-print-ast (js2-yield-node-value n) 0)))
+
+(cl-defstruct (js2-paren-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-paren-node (&key (type js2-LP)
+                                                       (pos js2-ts-cursor)
+                                                       len expr)))
+  "AST node for a parenthesized expression.
+In particular, used when the parens are syntactically optional,
+as opposed to required parens such as those enclosing an if-conditional."
+  expr)   ; `js2-node'
+
+(put 'cl-struct-js2-paren-node 'js2-visitor 'js2-visit-paren-node)
+(put 'cl-struct-js2-paren-node 'js2-printer 'js2-print-paren-node)
+
+(defun js2-visit-paren-node (n v)
+  (js2-visit-ast (js2-paren-node-expr n) v))
+
+(defun js2-print-paren-node (n i)
+  (insert (js2-make-pad i))
+  (insert "(")
+  (js2-print-ast (js2-paren-node-expr n) 0)
+  (insert ")"))
+
+(cl-defstruct (js2-comp-node
+               (:include js2-scope)
+               (:constructor nil)
+               (:constructor make-js2-comp-node (&key (type js2-ARRAYCOMP)
+                                                      (pos js2-ts-cursor)
+                                                      len result
+                                                      loops filters
+                                                      form)))
+  "AST node for an Array comprehension such as [[x,y] for (x in foo) for (y in bar)]."
+  result  ; result expression (just after left-bracket)
+  loops   ; a Lisp list of `js2-comp-loop-node'
+  filters ; a Lisp list of guard/filter expressions
+  form    ; ARRAY, LEGACY_ARRAY or STAR_GENERATOR
+          ; SpiderMonkey also supports "legacy generator expressions", but we dont.
+  )
+
+(put 'cl-struct-js2-comp-node 'js2-visitor 'js2-visit-comp-node)
+(put 'cl-struct-js2-comp-node 'js2-printer 'js2-print-comp-node)
+
+(defun js2-visit-comp-node (n v)
+  (js2-visit-ast (js2-comp-node-result n) v)
+  (dolist (l (js2-comp-node-loops n))
+    (js2-visit-ast l v))
+  (dolist (f (js2-comp-node-filters n))
+    (js2-visit-ast f v)))
+
+(defun js2-print-comp-node (n i)
+  (let ((pad (js2-make-pad i))
+        (result (js2-comp-node-result n))
+        (loops (js2-comp-node-loops n))
+        (filters (js2-comp-node-filters n))
+        (legacy-p (eq (js2-comp-node-form n) 'LEGACY_ARRAY))
+        (gen-p (eq (js2-comp-node-form n) 'STAR_GENERATOR)))
+    (insert pad (if gen-p "(" "["))
+    (when legacy-p
+      (js2-print-ast result 0))
+    (dolist (l loops)
+      (when legacy-p
+        (insert " "))
+      (js2-print-ast l 0)
+      (unless legacy-p
+        (insert " ")))
+    (dolist (f filters)
+      (when legacy-p
+        (insert " "))
+      (insert "if (")
+      (js2-print-ast f 0)
+      (insert ")")
+      (unless legacy-p
+        (insert " ")))
+    (unless legacy-p
+      (js2-print-ast result 0))
+    (insert (if gen-p ")" "]"))))
+
+(cl-defstruct (js2-comp-loop-node
+               (:include js2-for-in-node)
+               (:constructor nil)
+               (:constructor make-js2-comp-loop-node (&key (type js2-FOR)
+                                                           (pos js2-ts-cursor)
+                                                           len iterator
+                                                           object in-pos
+                                                           foreach-p
+                                                           each-pos
+                                                           forof-p
+                                                           lp rp)))
+  "AST subtree for each 'for (foo in bar)' loop in an array comprehension.")
+
+(put 'cl-struct-js2-comp-loop-node 'js2-visitor 'js2-visit-comp-loop)
+(put 'cl-struct-js2-comp-loop-node 'js2-printer 'js2-print-comp-loop)
+
+(defun js2-visit-comp-loop (n v)
+  (js2-visit-ast (js2-comp-loop-node-iterator n) v)
+  (js2-visit-ast (js2-comp-loop-node-object n) v))
+
+(defun js2-print-comp-loop (n _i)
+  (insert "for ")
+  (when (js2-comp-loop-node-foreach-p n) (insert "each "))
+  (insert "(")
+  (js2-print-ast (js2-comp-loop-node-iterator n) 0)
+  (insert (if (js2-comp-loop-node-forof-p n)
+              " of " " in "))
+  (js2-print-ast (js2-comp-loop-node-object n) 0)
+  (insert ")"))
+
+(cl-defstruct (js2-empty-expr-node
+               (:include js2-node)
+               (:constructor nil)
+               (:constructor make-js2-empty-expr-node (&key (type js2-EMPTY)
+                                                            (pos (js2-current-token-beg))
+                                                            len)))
+  "AST node for an empty expression.")
+
+(put 'cl-struct-js2-empty-expr-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-empty-expr-node 'js2-printer 'js2-print-none)
+
+(cl-defstruct (js2-xml-node
+               (:include js2-block-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-node (&key (type js2-XML)
+                                                     (pos (js2-current-token-beg))
+                                                     len kids)))
+  "AST node for initial parse of E4X literals.
+The kids field is a list of XML fragments, each a `js2-string-node' or
+a `js2-xml-js-expr-node'.  Equivalent to Rhino's XmlLiteral node.")
+
+(put 'cl-struct-js2-xml-node 'js2-visitor 'js2-visit-block)
+(put 'cl-struct-js2-xml-node 'js2-printer 'js2-print-xml-node)
+
+(defun js2-print-xml-node (n i)
+  (dolist (kid (js2-xml-node-kids n))
+    (js2-print-ast kid i)))
+
+(cl-defstruct (js2-xml-js-expr-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-js-expr-node (&key (type js2-XML)
+                                                             (pos js2-ts-cursor)
+                                                             len expr)))
+  "AST node for an embedded JavaScript {expression} in an E4X literal.
+The start and end fields correspond to the curly-braces."
+  expr)  ; a `js2-expr-node' of some sort
+
+(put 'cl-struct-js2-xml-js-expr-node 'js2-visitor 'js2-visit-xml-js-expr)
+(put 'cl-struct-js2-xml-js-expr-node 'js2-printer 'js2-print-xml-js-expr)
+
+(defun js2-visit-xml-js-expr (n v)
+  (js2-visit-ast (js2-xml-js-expr-node-expr n) v))
+
+(defun js2-print-xml-js-expr (n i)
+  (insert (js2-make-pad i))
+  (insert "{")
+  (js2-print-ast (js2-xml-js-expr-node-expr n) 0)
+  (insert "}"))
+
+(cl-defstruct (js2-xml-dot-query-node
+               (:include js2-infix-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-dot-query-node (&key (type js2-DOTQUERY)
+                                                               (pos js2-ts-cursor)
+                                                               op-pos len left
+                                                               right rp)))
+  "AST node for an E4X foo.(bar) filter expression.
+Note that the left-paren is automatically the character immediately
+following the dot (.) in the operator.  No whitespace is permitted
+between the dot and the lp by the scanner."
+  rp)
+
+(put 'cl-struct-js2-xml-dot-query-node 'js2-visitor 'js2-visit-infix-node)
+(put 'cl-struct-js2-xml-dot-query-node 'js2-printer 'js2-print-xml-dot-query)
+
+(defun js2-print-xml-dot-query (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-xml-dot-query-node-left n) 0)
+  (insert ".(")
+  (js2-print-ast (js2-xml-dot-query-node-right n) 0)
+  (insert ")"))
+
+(cl-defstruct (js2-xml-ref-node
+               (:include js2-node)
+               (:constructor nil))  ; abstract
+  "Base type for E4X XML attribute-access or property-get expressions.
+Such expressions can take a variety of forms.  The general syntax has
+three parts:
+
+  - (optional) an @ (specifying an attribute access)
+  - (optional) a namespace (a `js2-name-node') and double-colon
+  - (required) either a `js2-name-node' or a bracketed [expression]
+
+The property-name expressions (examples:  ns::name, @name) are
+represented as `js2-xml-prop-ref' nodes.  The bracketed-expression
+versions (examples:  ns::[name], @[name]) become `js2-xml-elem-ref' nodes.
+
+This node type (or more specifically, its subclasses) will sometimes
+be the right-hand child of a `js2-prop-get-node' or a
+`js2-infix-node' of type `js2-DOTDOT', the .. xml-descendants operator.
+The `js2-xml-ref-node' may also be a standalone primary expression with
+no explicit target, which is valid in certain expression contexts such as
+
+  company..employee.(@id < 100)
+
+in this case, the @id is a `js2-xml-ref' that is part of an infix '<'
+expression whose parent is a `js2-xml-dot-query-node'."
+  namespace
+  at-pos
+  colon-pos)
+
+(defsubst js2-xml-ref-node-attr-access-p (node)
+  "Return non-nil if this expression began with an @-token."
+  (and (numberp (js2-xml-ref-node-at-pos node))
+       (cl-plusp (js2-xml-ref-node-at-pos node))))
+
+(cl-defstruct (js2-xml-prop-ref-node
+               (:include js2-xml-ref-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-prop-ref-node (&key (type js2-REF_NAME)
+                                                              (pos (js2-current-token-beg))
+                                                              len propname
+                                                              namespace at-pos
+                                                              colon-pos)))
+  "AST node for an E4X XML [expr] property-ref expression.
+The JavaScript syntax is an optional @, an optional ns::, and a name.
+
+  [ '@' ] [ name '::' ] name
+
+Examples include name, ns::name, ns::*, *::name, *::*, @attr, @ns::attr,
address@hidden::*, @*::attr, @*::*, and @*.
+
+The node starts at the @ token, if present.  Otherwise it starts at the
+namespace name.  The node bounds extend through the closing right-bracket,
+or if it is missing due to a syntax error, through the end of the index
+expression."
+  propname)
+
+(put 'cl-struct-js2-xml-prop-ref-node 'js2-visitor 'js2-visit-xml-prop-ref-node)
+(put 'cl-struct-js2-xml-prop-ref-node 'js2-printer 'js2-print-xml-prop-ref-node)
+
+(defun js2-visit-xml-prop-ref-node (n v)
+  (js2-visit-ast (js2-xml-prop-ref-node-namespace n) v)
+  (js2-visit-ast (js2-xml-prop-ref-node-propname n) v))
+
+(defun js2-print-xml-prop-ref-node (n i)
+  (insert (js2-make-pad i))
+  (if (js2-xml-ref-node-attr-access-p n)
+      (insert "@"))
+  (when (js2-xml-prop-ref-node-namespace n)
+    (js2-print-ast (js2-xml-prop-ref-node-namespace n) 0)
+    (insert "::"))
+  (if (js2-xml-prop-ref-node-propname n)
+      (js2-print-ast (js2-xml-prop-ref-node-propname n) 0)))
+
+(cl-defstruct (js2-xml-elem-ref-node
+               (:include js2-xml-ref-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-elem-ref-node (&key (type js2-REF_MEMBER)
+                                                              (pos (js2-current-token-beg))
+                                                              len expr lb rb
+                                                              namespace at-pos
+                                                              colon-pos)))
+  "AST node for an E4X XML [expr] member-ref expression.
+Syntax:
+
+ [ '@' ] [ name '::' ] '[' expr ']'
+
+Examples include ns::[expr], @ns::[expr], @[expr], *::[expr] and @*::[expr].
+
+Note that the form [expr] (i.e. no namespace or attribute-qualifier)
+is not a legal E4X XML element-ref expression, since it's already used
+for standard JavaScript element-get array indexing.  Hence, a
+`js2-xml-elem-ref-node' always has either the attribute-qualifier, a
+non-nil namespace node, or both.
+
+The node starts at the @ token, if present.  Otherwise it starts
+at the namespace name.  The node bounds extend through the closing
+right-bracket, or if it is missing due to a syntax error, through the
+end of the index expression."
+  expr  ; the bracketed index expression
+  lb
+  rb)
+
+(put 'cl-struct-js2-xml-elem-ref-node 'js2-visitor 'js2-visit-xml-elem-ref-node)
+(put 'cl-struct-js2-xml-elem-ref-node 'js2-printer 'js2-print-xml-elem-ref-node)
+
+(defun js2-visit-xml-elem-ref-node (n v)
+  (js2-visit-ast (js2-xml-elem-ref-node-namespace n) v)
+  (js2-visit-ast (js2-xml-elem-ref-node-expr n) v))
+
+(defun js2-print-xml-elem-ref-node (n i)
+  (insert (js2-make-pad i))
+  (if (js2-xml-ref-node-attr-access-p n)
+      (insert "@"))
+  (when (js2-xml-elem-ref-node-namespace n)
+    (js2-print-ast (js2-xml-elem-ref-node-namespace n) 0)
+    (insert "::"))
+  (insert "[")
+  (if (js2-xml-elem-ref-node-expr n)
+      (js2-print-ast (js2-xml-elem-ref-node-expr n) 0))
+  (insert "]"))
+
+;;; Placeholder nodes for when we try parsing the XML literals structurally.
+
+(cl-defstruct (js2-xml-start-tag-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-start-tag-node (&key (type js2-XML)
+                                                               (pos js2-ts-cursor)
+                                                               len name attrs kids
+                                                               empty-p)))
+  "AST node for an XML start-tag.  Not currently used.
+The `kids' field is a Lisp list of child content nodes."
+  name      ; a `js2-xml-name-node'
+  attrs     ; a Lisp list of `js2-xml-attr-node'
+  empty-p)  ; t if this is an empty element such as <foo bar="baz"/>
+
+(put 'cl-struct-js2-xml-start-tag-node 'js2-visitor 'js2-visit-xml-start-tag)
+(put 'cl-struct-js2-xml-start-tag-node 'js2-printer 'js2-print-xml-start-tag)
+
+(defun js2-visit-xml-start-tag (n v)
+  (js2-visit-ast (js2-xml-start-tag-node-name n) v)
+  (dolist (attr (js2-xml-start-tag-node-attrs n))
+    (js2-visit-ast attr v))
+  (js2-visit-block n v))
+
+(defun js2-print-xml-start-tag (n i)
+  (insert (js2-make-pad i) "<")
+  (js2-print-ast (js2-xml-start-tag-node-name n) 0)
+  (when (js2-xml-start-tag-node-attrs n)
+    (insert " ")
+    (js2-print-list (js2-xml-start-tag-node-attrs n) " "))
+  (insert ">"))
+
+;; I -think- I'm going to make the parent node the corresponding start-tag,
+;; and add the end-tag to the kids list of the parent as well.
+(cl-defstruct (js2-xml-end-tag-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-end-tag-node (&key (type js2-XML)
+                                                             (pos js2-ts-cursor)
+                                                             len name)))
+  "AST node for an XML end-tag.  Not currently used."
+  name)  ; a `js2-xml-name-node'
+
+(put 'cl-struct-js2-xml-end-tag-node 'js2-visitor 'js2-visit-xml-end-tag)
+(put 'cl-struct-js2-xml-end-tag-node 'js2-printer 'js2-print-xml-end-tag)
+
+(defun js2-visit-xml-end-tag (n v)
+  (js2-visit-ast (js2-xml-end-tag-node-name n) v))
+
+(defun js2-print-xml-end-tag (n i)
+  (insert (js2-make-pad i))
+  (insert "</")
+  (js2-print-ast (js2-xml-end-tag-node-name n) 0)
+  (insert ">"))
+
+(cl-defstruct (js2-xml-name-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-name-node (&key (type js2-XML)
+                                                          (pos js2-ts-cursor)
+                                                          len namespace kids)))
+  "AST node for an E4X XML name.  Not currently used.
+Any XML name can be qualified with a namespace, hence the namespace field.
+Further, any E4X name can be comprised of arbitrary JavaScript {} expressions.
+The kids field is a list of `js2-name-node' and `js2-xml-js-expr-node'.
+For a simple name, the kids list has exactly one node, a `js2-name-node'."
+  namespace)  ; a `js2-string-node'
+
+(put 'cl-struct-js2-xml-name-node 'js2-visitor 'js2-visit-xml-name-node)
+(put 'cl-struct-js2-xml-name-node 'js2-printer 'js2-print-xml-name-node)
+
+(defun js2-visit-xml-name-node (n v)
+  (js2-visit-ast (js2-xml-name-node-namespace n) v))
+
+(defun js2-print-xml-name-node (n i)
+  (insert (js2-make-pad i))
+  (when (js2-xml-name-node-namespace n)
+    (js2-print-ast (js2-xml-name-node-namespace n) 0)
+    (insert "::"))
+  (dolist (kid (js2-xml-name-node-kids n))
+    (js2-print-ast kid 0)))
+
+(cl-defstruct (js2-xml-pi-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-pi-node (&key (type js2-XML)
+                                                        (pos js2-ts-cursor)
+                                                        len name attrs)))
+  "AST node for an E4X XML processing instruction.  Not currently used."
+  name   ; a `js2-xml-name-node'
+  attrs) ; a list of `js2-xml-attr-node'
+
+(put 'cl-struct-js2-xml-pi-node 'js2-visitor 'js2-visit-xml-pi-node)
+(put 'cl-struct-js2-xml-pi-node 'js2-printer 'js2-print-xml-pi-node)
+
+(defun js2-visit-xml-pi-node (n v)
+  (js2-visit-ast (js2-xml-pi-node-name n) v)
+  (dolist (attr (js2-xml-pi-node-attrs n))
+    (js2-visit-ast attr v)))
+
+(defun js2-print-xml-pi-node (n i)
+  (insert (js2-make-pad i) "<?")
+  (js2-print-ast (js2-xml-pi-node-name n))
+  (when (js2-xml-pi-node-attrs n)
+    (insert " ")
+    (js2-print-list (js2-xml-pi-node-attrs n)))
+  (insert "?>"))
+
+(cl-defstruct (js2-xml-cdata-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-cdata-node (&key (type js2-XML)
+                                                           (pos js2-ts-cursor)
+                                                           len content)))
+  "AST node for a CDATA escape section.  Not currently used."
+  content)  ; a `js2-string-node' with node-property 'quote-type 'cdata
+
+(put 'cl-struct-js2-xml-cdata-node 'js2-visitor 'js2-visit-xml-cdata-node)
+(put 'cl-struct-js2-xml-cdata-node 'js2-printer 'js2-print-xml-cdata-node)
+
+(defun js2-visit-xml-cdata-node (n v)
+  (js2-visit-ast (js2-xml-cdata-node-content n) v))
+
+(defun js2-print-xml-cdata-node (n i)
+  (insert (js2-make-pad i))
+  (js2-print-ast (js2-xml-cdata-node-content n)))
+
+(cl-defstruct (js2-xml-attr-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-attr-node (&key (type js2-XML)
+                                                      (pos js2-ts-cursor)
+                                                      len name value
+                                                      eq-pos quote-type)))
+  "AST node representing a foo='bar' XML attribute value.  Not yet used."
+  name   ; a `js2-xml-name-node'
+  value  ; a `js2-xml-name-node'
+  eq-pos ; buffer position of "=" sign
+  quote-type) ; 'single or 'double
+
+(put 'cl-struct-js2-xml-attr-node 'js2-visitor 'js2-visit-xml-attr-node)
+(put 'cl-struct-js2-xml-attr-node 'js2-printer 'js2-print-xml-attr-node)
+
+(defun js2-visit-xml-attr-node (n v)
+  (js2-visit-ast (js2-xml-attr-node-name n) v)
+  (js2-visit-ast (js2-xml-attr-node-value n) v))
+
+(defun js2-print-xml-attr-node (n i)
+  (let ((quote (if (eq (js2-xml-attr-node-quote-type n) 'single)
+                   "'"
+                 "\"")))
+    (insert (js2-make-pad i))
+    (js2-print-ast (js2-xml-attr-node-name n) 0)
+    (insert "=" quote)
+    (js2-print-ast (js2-xml-attr-node-value n) 0)
+    (insert quote)))
+
+(cl-defstruct (js2-xml-text-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-text-node (&key (type js2-XML)
+                                                      (pos js2-ts-cursor)
+                                                      len content)))
+  "AST node for an E4X XML text node.  Not currently used."
+  content)  ; a Lisp list of `js2-string-node' and `js2-xml-js-expr-node'
+
+(put 'cl-struct-js2-xml-text-node 'js2-visitor 'js2-visit-xml-text-node)
+(put 'cl-struct-js2-xml-text-node 'js2-printer 'js2-print-xml-text-node)
+
+(defun js2-visit-xml-text-node (n v)
+  (js2-visit-ast (js2-xml-text-node-content n) v))
+
+(defun js2-print-xml-text-node (n i)
+  (insert (js2-make-pad i))
+  (dolist (kid (js2-xml-text-node-content n))
+    (js2-print-ast kid)))
+
+(cl-defstruct (js2-xml-comment-node
+               (:include js2-xml-node)
+               (:constructor nil)
+               (:constructor make-js2-xml-comment-node (&key (type js2-XML)
+                                                             (pos js2-ts-cursor)
+                                                             len)))
+  "AST node for E4X XML comment.  Not currently used.")
+
+(put 'cl-struct-js2-xml-comment-node 'js2-visitor 'js2-visit-none)
+(put 'cl-struct-js2-xml-comment-node 'js2-printer 'js2-print-xml-comment)
+
+(defun js2-print-xml-comment (n i)
+  (insert (js2-make-pad i)
+          (js2-node-string n)))
+
+;;; Node utilities
+
+(defsubst js2-node-line (n)
+  "Fetch the source line number at the start of node N.
+This is O(n) in the length of the source buffer; use prudently."
+  (1+ (count-lines (point-min) (js2-node-abs-pos n))))
+
+(defsubst js2-block-node-kid (n i)
+  "Return child I of node N, or nil if there aren't that many."
+  (nth i (js2-block-node-kids n)))
+
+(defsubst js2-block-node-first (n)
+  "Return first child of block node N, or nil if there is none."
+  (cl-first (js2-block-node-kids n)))
+
+(defun js2-node-root (n)
+  "Return the root of the AST containing N.
+If N has no parent pointer, returns N."
+  (let ((parent (js2-node-parent n)))
+    (if parent
+        (js2-node-root parent)
+      n)))
+
+(defsubst js2-node-short-name (n)
+  "Return the short name of node N as a string, e.g. `js2-if-node'."
+  (substring (symbol-name (aref n 0))
+             (length "cl-struct-")))
+
+(defun js2-node-child-list (node)
+  "Return the child list for NODE, a Lisp list of nodes.
+Works for block nodes, array nodes, obj literals, funarg lists,
+var decls and try nodes (for catch clauses).  Note that you should call
+`js2-block-node-kids' on the function body for the body statements.
+Returns nil for zero-length child lists or unsupported nodes."
+  (cond
+   ((js2-function-node-p node)
+    (js2-function-node-params node))
+   ((js2-block-node-p node)
+    (js2-block-node-kids node))
+   ((js2-try-node-p node)
+    (js2-try-node-catch-clauses node))
+   ((js2-array-node-p node)
+    (js2-array-node-elems node))
+   ((js2-object-node-p node)
+    (js2-object-node-elems node))
+   ((js2-call-node-p node)
+    (js2-call-node-args node))
+   ((js2-new-node-p node)
+    (js2-new-node-args node))
+   ((js2-var-decl-node-p node)
+    (js2-var-decl-node-kids node))
+   (t
+    nil)))
+
+(defun js2-node-set-child-list (node kids)
+  "Set the child list for NODE to KIDS."
+   (cond
+    ((js2-function-node-p node)
+     (setf (js2-function-node-params node) kids))
+    ((js2-block-node-p node)
+     (setf (js2-block-node-kids node) kids))
+    ((js2-try-node-p node)
+     (setf (js2-try-node-catch-clauses node) kids))
+    ((js2-array-node-p node)
+     (setf (js2-array-node-elems node) kids))
+    ((js2-object-node-p node)
+     (setf (js2-object-node-elems node) kids))
+    ((js2-call-node-p node)
+     (setf (js2-call-node-args node) kids))
+    ((js2-new-node-p node)
+     (setf (js2-new-node-args node) kids))
+    ((js2-var-decl-node-p node)
+     (setf (js2-var-decl-node-kids node) kids))
+    (t
+     (error "Unsupported node type: %s" (js2-node-short-name node))))
+   kids)
+
+;; All because Common Lisp doesn't support multiple inheritance for defstructs.
+(defconst js2-paren-expr-nodes
+  '(cl-struct-js2-comp-loop-node
+    cl-struct-js2-comp-node
+    cl-struct-js2-call-node
+    cl-struct-js2-catch-node
+    cl-struct-js2-do-node
+    cl-struct-js2-elem-get-node
+    cl-struct-js2-for-in-node
+    cl-struct-js2-for-node
+    cl-struct-js2-function-node
+    cl-struct-js2-if-node
+    cl-struct-js2-let-node
+    cl-struct-js2-new-node
+    cl-struct-js2-paren-node
+    cl-struct-js2-switch-node
+    cl-struct-js2-while-node
+    cl-struct-js2-with-node
+    cl-struct-js2-xml-dot-query-node)
+  "Node types that can have a parenthesized child expression.
+In particular, nodes that respond to `js2-node-lp' and `js2-node-rp'.")
+
+(defsubst js2-paren-expr-node-p (node)
+  "Return t for nodes that typically have a parenthesized child expression.
+Useful for computing the indentation anchors for arg-lists and conditions.
+Note that it may return a false positive, for instance when NODE is
+a `js2-new-node' and there are no arguments or parentheses."
+  (memq (aref node 0) js2-paren-expr-nodes))
+
+;; Fake polymorphism... yech.
+(defun js2-node-lp (node)
+  "Return relative left-paren position for NODE, if applicable.
+For `js2-elem-get-node' structs, returns left-bracket position.
+Note that the position may be nil in the case of a parse error."
+  (cond
+   ((js2-elem-get-node-p node)
+    (js2-elem-get-node-lb node))
+   ((js2-loop-node-p node)
+    (js2-loop-node-lp node))
+   ((js2-function-node-p node)
+    (js2-function-node-lp node))
+   ((js2-if-node-p node)
+    (js2-if-node-lp node))
+   ((js2-new-node-p node)
+    (js2-new-node-lp node))
+   ((js2-call-node-p node)
+    (js2-call-node-lp node))
+   ((js2-paren-node-p node)
+    0)
+   ((js2-switch-node-p node)
+    (js2-switch-node-lp node))
+   ((js2-catch-node-p node)
+    (js2-catch-node-lp node))
+   ((js2-let-node-p node)
+    (js2-let-node-lp node))
+   ((js2-comp-node-p node)
+    0)
+   ((js2-with-node-p node)
+    (js2-with-node-lp node))
+   ((js2-xml-dot-query-node-p node)
+    (1+ (js2-infix-node-op-pos node)))
+   (t
+    (error "Unsupported node type: %s" (js2-node-short-name node)))))
+
+;; Fake polymorphism... blech.
+(defun js2-node-rp (node)
+  "Return relative right-paren position for NODE, if applicable.
+For `js2-elem-get-node' structs, returns right-bracket position.
+Note that the position may be nil in the case of a parse error."
+  (cond
+   ((js2-elem-get-node-p node)
+    (js2-elem-get-node-rb node))
+   ((js2-loop-node-p node)
+    (js2-loop-node-rp node))
+   ((js2-function-node-p node)
+    (js2-function-node-rp node))
+   ((js2-if-node-p node)
+    (js2-if-node-rp node))
+   ((js2-new-node-p node)
+    (js2-new-node-rp node))
+   ((js2-call-node-p node)
+    (js2-call-node-rp node))
+   ((js2-paren-node-p node)
+    (1- (js2-node-len node)))
+   ((js2-switch-node-p node)
+    (js2-switch-node-rp node))
+   ((js2-catch-node-p node)
+    (js2-catch-node-rp node))
+   ((js2-let-node-p node)
+    (js2-let-node-rp node))
+   ((js2-comp-node-p node)
+    (1- (js2-node-len node)))
+   ((js2-with-node-p node)
+    (js2-with-node-rp node))
+   ((js2-xml-dot-query-node-p node)
+    (1+ (js2-xml-dot-query-node-rp node)))
+   (t
+    (error "Unsupported node type: %s" (js2-node-short-name node)))))
+
+(defsubst js2-node-first-child (node)
+  "Return the first element of `js2-node-child-list' for NODE."
+  (car (js2-node-child-list node)))
+
+(defsubst js2-node-last-child (node)
+  "Return the last element of `js2-node-last-child' for NODE."
+  (car (last (js2-node-child-list node))))
+
+(defun js2-node-prev-sibling (node)
+  "Return the previous statement in parent.
+Works for parents supported by `js2-node-child-list'.
+Returns nil if NODE is not in the parent, or PARENT is
+not a supported node, or if NODE is the first child."
+  (let* ((p (js2-node-parent node))
+         (kids (js2-node-child-list p))
+         (sib (car kids)))
+    (while (and kids
+                (not (eq node (cadr kids))))
+      (setq kids (cdr kids)
+            sib (car kids)))
+    sib))
+
+(defun js2-node-next-sibling (node)
+  "Return the next statement in parent block.
+Returns nil if NODE is not in the block, or PARENT is not
+a block node, or if NODE is the last statement."
+  (let* ((p (js2-node-parent node))
+         (kids (js2-node-child-list p)))
+    (while (and kids
+                (not (eq node (car kids))))
+      (setq kids (cdr kids)))
+    (cadr kids)))
+
+(defun js2-node-find-child-before (pos parent &optional after)
+  "Find the last child that starts before POS in parent.
+If AFTER is non-nil, returns first child starting after POS.
+POS is an absolute buffer position.  PARENT is any node
+supported by `js2-node-child-list'.
+Returns nil if no applicable child is found."
+  (let ((kids (if (js2-function-node-p parent)
+                  (js2-block-node-kids (js2-function-node-body parent))
+                (js2-node-child-list parent)))
+        (beg (js2-node-abs-pos (if (js2-function-node-p parent)
+                                   (js2-function-node-body parent)
+                                 parent)))
+        kid result fn
+        (continue t))
+    (setq fn (if after '>= '<))
+    (while (and kids continue)
+      (setq kid (car kids))
+      (if (funcall fn (+ beg (js2-node-pos kid)) pos)
+          (setq result kid
+                continue (not after))
+        (setq continue after))
+      (setq kids (cdr kids)))
+    result))
+
+(defun js2-node-find-child-after (pos parent)
+  "Find first child that starts after POS in parent.
+POS is an absolute buffer position.  PARENT is any node
+supported by `js2-node-child-list'.
+Returns nil if no applicable child is found."
+  (js2-node-find-child-before pos parent 'after))
+
+(defun js2-node-replace-child (pos parent new-node)
+  "Replace node at index POS in PARENT with NEW-NODE.
+Only works for parents supported by `js2-node-child-list'."
+  (let ((kids (js2-node-child-list parent))
+        (i 0))
+    (while (< i pos)
+      (setq kids (cdr kids)
+            i (1+ i)))
+    (setcar kids new-node)
+    (js2-node-add-children parent new-node)))
+
+(defun js2-node-buffer (n)
+  "Return the buffer associated with AST N.
+Returns nil if the buffer is not set as a property on the root
+node, or if parent links were not recorded during parsing."
+  (let ((root (js2-node-root n)))
+    (and root
+         (js2-ast-root-p root)
+         (js2-ast-root-buffer root))))
+
+(defun js2-block-node-push (n kid)
+  "Push js2-node KID onto the end of js2-block-node N's child list.
+KID is always added to the -end- of the kids list.
+Function also calls `js2-node-add-children' to add the parent link."
+  (let ((kids (js2-node-child-list n)))
+    (if kids
+        (setcdr kids (nconc (cdr kids) (list kid)))
+      (js2-node-set-child-list n (list kid)))
+    (js2-node-add-children n kid)))
+
+(defun js2-node-string (node)
+  (with-current-buffer (or (js2-node-buffer node)
+                           (error "No buffer available for node %s" node))
+    (let ((pos (js2-node-abs-pos node)))
+      (buffer-substring-no-properties pos (+ pos (js2-node-len node))))))
+
+;; Container for storing the node we're looking for in a traversal.
+(js2-deflocal js2-discovered-node nil)
+
+;; Keep track of absolute node position during traversals.
+(js2-deflocal js2-visitor-offset nil)
+
+(js2-deflocal js2-node-search-point nil)
+
+(when js2-mode-dev-mode-p
+  (defun js2-find-node-at-point ()
+    (interactive)
+    (let ((node (js2-node-at-point)))
+      (message "%s" (or node "No node found at point"))))
+  (defun js2-node-name-at-point ()
+    (interactive)
+    (let ((node (js2-node-at-point)))
+      (message "%s" (if node
+                        (js2-node-short-name node)
+                      "No node found at point.")))))
+
+(defun js2-node-at-point (&optional pos skip-comments)
+  "Return AST node at POS, a buffer position, defaulting to current point.
+The `js2-mode-ast' variable must be set to the current parse tree.
+Signals an error if the AST (`js2-mode-ast') is nil.
+Always returns a node - if it can't find one, it returns the root.
+If SKIP-COMMENTS is non-nil, comment nodes are ignored."
+  (let ((ast js2-mode-ast)
+        result)
+    (unless ast
+      (error "No JavaScript AST available"))
+    ;; Look through comments first, since they may be inside nodes that
+    ;; would otherwise report a match.
+    (setq pos (or pos (point))
+          result (if (> pos (js2-node-abs-end ast))
+                     ast
+                   (if (not skip-comments)
+                       (js2-comment-at-point pos))))
+    (unless result
+      (setq js2-discovered-node nil
+            js2-visitor-offset 0
+            js2-node-search-point pos)
+      (unwind-protect
+          (catch 'js2-visit-done
+            (js2-visit-ast ast #'js2-node-at-point-visitor))
+        (setq js2-visitor-offset nil
+              js2-node-search-point nil))
+      (setq result js2-discovered-node))
+    ;; may have found a comment beyond end of last child node,
+    ;; since visiting the ast-root looks at the comment-list last.
+    (if (and skip-comments
+             (js2-comment-node-p result))
+        (setq result nil))
+    (or result js2-mode-ast)))
+
+(defun js2-node-at-point-visitor (node end-p)
+  (let ((rel-pos (js2-node-pos node))
+        abs-pos
+        abs-end
+        (point js2-node-search-point))
+    (cond
+     (end-p
+      ;; this evaluates to a non-nil return value, even if it's zero
+      (cl-decf js2-visitor-offset rel-pos))
+     ;; we already looked for comments before visiting, and don't want them now
+     ((js2-comment-node-p node)
+      nil)
+     (t
+      (setq abs-pos (cl-incf js2-visitor-offset rel-pos)
+            ;; we only want to use the node if the point is before
+            ;; the last character position in the node, so we decrement
+            ;; the absolute end by 1.
+            abs-end (+ abs-pos (js2-node-len node) -1))
+      (cond
+       ;; If this node starts after search-point, stop the search.
+       ((> abs-pos point)
+        (throw 'js2-visit-done nil))
+       ;; If this node ends before the search-point, don't check kids.
+       ((> point abs-end)
+        nil)
+       (t
+        ;; Otherwise point is within this node, possibly in a child.
+        (setq js2-discovered-node node)
+        t))))))  ; keep processing kids to look for more specific match
+
+(defsubst js2-block-comment-p (node)
+  "Return non-nil if NODE is a comment node of format `jsdoc' or `block'."
+  (and (js2-comment-node-p node)
+       (memq (js2-comment-node-format node) '(jsdoc block))))
+
+;; TODO:  put the comments in a vector and binary-search them instead
+(defun js2-comment-at-point (&optional pos)
+  "Look through scanned comment nodes for one containing POS.
+POS is a buffer position that defaults to current point.
+Function returns nil if POS was not in any comment node."
+  (let ((ast js2-mode-ast)
+        (x (or pos (point)))
+        beg end)
+    (unless ast
+      (error "No JavaScript AST available"))
+    (catch 'done
+      ;; Comments are stored in lexical order.
+      (dolist (comment (js2-ast-root-comments ast) nil)
+        (setq beg (js2-node-abs-pos comment)
+              end (+ beg (js2-node-len comment)))
+        (if (and (>= x beg)
+                 (<= x end))
+            (throw 'done comment))))))
+
+(defun js2-mode-find-parent-fn (node)
+  "Find function enclosing NODE.
+Returns nil if NODE is not inside a function."
+  (setq node (js2-node-parent node))
+  (while (and node (not (js2-function-node-p node)))
+    (setq node (js2-node-parent node)))
+  (and (js2-function-node-p node) node))
+
+(defun js2-mode-find-enclosing-fn (node)
+  "Find function or root enclosing NODE."
+  (if (js2-ast-root-p node)
+      node
+    (setq node (js2-node-parent node))
+    (while (not (or (js2-ast-root-p node)
+                    (js2-function-node-p node)))
+      (setq node (js2-node-parent node)))
+    node))
+
+ (defun js2-mode-find-enclosing-node (beg end)
+  "Find node fully enclosing BEG and END."
+  (let ((node (js2-node-at-point beg))
+        pos
+        (continue t))
+    (while continue
+      (if (or (js2-ast-root-p node)
+              (and
+               (<= (setq pos (js2-node-abs-pos node)) beg)
+               (>= (+ pos (js2-node-len node)) end)))
+          (setq continue nil)
+        (setq node (js2-node-parent node))))
+    node))
+
+(defun js2-node-parent-script-or-fn (node)
+  "Find script or function immediately enclosing NODE.
+If NODE is the ast-root, returns nil."
+  (if (js2-ast-root-p node)
+      nil
+    (setq node (js2-node-parent node))
+    (while (and node (not (or (js2-function-node-p node)
+                              (js2-script-node-p node))))
+      (setq node (js2-node-parent node)))
+    node))
+
+(defun js2-node-is-descendant (node ancestor)
+  "Return t if NODE is a descendant of ANCESTOR."
+  (while (and node
+              (not (eq node ancestor)))
+    (setq node (js2-node-parent node)))
+  node)
+
+;;; visitor infrastructure
+
+(defun js2-visit-none (_node _callback)
+  "Visitor for AST node that have no node children."
+  nil)
+
+(defun js2-print-none (_node _indent)
+  "Visitor for AST node with no printed representation.")
+
+(defun js2-print-body (node indent)
+  "Print a statement, or a block without braces."
+  (if (js2-block-node-p node)
+      (dolist (kid (js2-block-node-kids node))
+        (js2-print-ast kid indent))
+    (js2-print-ast node indent)))
+
+(defun js2-print-list (args &optional delimiter)
+  (cl-loop with len = (length args)
+           for arg in args
+           for count from 1
+           do
+           (when arg (js2-print-ast arg 0))
+           (if (< count len)
+               (insert (or delimiter ", ")))))
+
+(defun js2-print-tree (ast)
+  "Prints an AST to the current buffer.
+Makes `js2-ast-parent-nodes' available to the printer functions."
+  (let ((max-lisp-eval-depth (max max-lisp-eval-depth 1500)))
+    (js2-print-ast ast)))
+
+(defun js2-print-ast (node &optional indent)
+  "Helper function for printing AST nodes.
+Requires `js2-ast-parent-nodes' to be non-nil.
+You should use `js2-print-tree' instead of this function."
+  (let ((printer (get (aref node 0) 'js2-printer))
+        (i (or indent 0)))
+    ;; TODO:  wedge comments in here somewhere
+    (if printer
+        (funcall printer node i))))
+
+(defconst js2-side-effecting-tokens
+  (let ((tokens (make-bool-vector js2-num-tokens nil)))
+    (dolist (tt (list js2-ASSIGN
+                      js2-ASSIGN_ADD
+                      js2-ASSIGN_BITAND
+                      js2-ASSIGN_BITOR
+                      js2-ASSIGN_BITXOR
+                      js2-ASSIGN_DIV
+                      js2-ASSIGN_LSH
+                      js2-ASSIGN_MOD
+                      js2-ASSIGN_MUL
+                      js2-ASSIGN_RSH
+                      js2-ASSIGN_SUB
+                      js2-ASSIGN_URSH
+                      js2-BLOCK
+                      js2-BREAK
+                      js2-CALL
+                      js2-CATCH
+                      js2-CATCH_SCOPE
+                      js2-CLASS
+                      js2-CONST
+                      js2-CONTINUE
+                      js2-DEBUGGER
+                      js2-DEC
+                      js2-DELPROP
+                      js2-DEL_REF
+                      js2-DO
+                      js2-ELSE
+                      js2-EMPTY
+                      js2-ENTERWITH
+                      js2-EXPORT
+                      js2-EXPR_RESULT
+                      js2-FINALLY
+                      js2-FOR
+                      js2-FUNCTION
+                      js2-GOTO
+                      js2-IF
+                      js2-IFEQ
+                      js2-IFNE
+                      js2-IMPORT
+                      js2-INC
+                      js2-JSR
+                      js2-LABEL
+                      js2-LEAVEWITH
+                      js2-LET
+                      js2-LETEXPR
+                      js2-LOCAL_BLOCK
+                      js2-LOOP
+                      js2-NEW
+                      js2-REF_CALL
+                      js2-RETHROW
+                      js2-RETURN
+                      js2-RETURN_RESULT
+                      js2-SEMI
+                      js2-SETELEM
+                      js2-SETELEM_OP
+                      js2-SETNAME
+                      js2-SETPROP
+                      js2-SETPROP_OP
+                      js2-SETVAR
+                      js2-SET_REF
+                      js2-SET_REF_OP
+                      js2-SWITCH
+                      js2-TARGET
+                      js2-THROW
+                      js2-TRY
+                      js2-VAR
+                      js2-WHILE
+                      js2-WITH
+                      js2-WITHEXPR
+                      js2-YIELD))
+      (aset tokens tt t))
+    (if js2-instanceof-has-side-effects
+        (aset tokens js2-INSTANCEOF t))
+    tokens))
+
+(defun js2-node-has-side-effects (node)
+  "Return t if NODE has side effects."
+  (when node  ; makes it easier to handle malformed expressions
+    (let ((tt (js2-node-type node)))
+      (cond
+       ;; This doubtless needs some work, since EXPR_VOID is used
+       ;; in several ways in Rhino and I may not have caught them all.
+       ;; I'll wait for people to notice incorrect warnings.
+       ((and (= tt js2-EXPR_VOID)
+             (js2-expr-stmt-node-p node)) ; but not if EXPR_RESULT
+        (let ((expr (js2-expr-stmt-node-expr node)))
+          (or (js2-node-has-side-effects expr)
+              (when (js2-string-node-p expr)
+                (member (js2-string-node-value expr) '("use strict" "use asm"))))))
+       ((= tt js2-COMMA)
+        (js2-node-has-side-effects (js2-infix-node-right node)))
+       ((or (= tt js2-AND)
+            (= tt js2-OR))
+        (or (js2-node-has-side-effects (js2-infix-node-right node))
+            (js2-node-has-side-effects (js2-infix-node-left node))))
+       ((= tt js2-HOOK)
+        (and (js2-node-has-side-effects (js2-cond-node-true-expr node))
+             (js2-node-has-side-effects (js2-cond-node-false-expr node))))
+       ((js2-paren-node-p node)
+        (js2-node-has-side-effects (js2-paren-node-expr node)))
+       ((= tt js2-ERROR) ; avoid cascaded error messages
+        nil)
+       (t
+        (aref js2-side-effecting-tokens tt))))))
+
+(defconst js2-stmt-node-types
+  (list js2-BLOCK
+        js2-BREAK
+        js2-CONTINUE
+        js2-DEFAULT  ; e4x "default xml namespace" statement
+        js2-DO
+        js2-EXPORT
+        js2-EXPR_RESULT
+        js2-EXPR_VOID
+        js2-FOR
+        js2-IF
+        js2-IMPORT
+        js2-RETURN
+        js2-SWITCH
+        js2-THROW
+        js2-TRY
+        js2-WHILE
+        js2-WITH)
+  "Node types that only appear in statement contexts.
+The list does not include nodes that always appear as the child
+of another specific statement type, such as switch-cases,
+catch and finally blocks, and else-clauses.  The list also excludes
+nodes like yield, let and var, which may appear in either expression
+or statement context, and in the latter context always have a
+`js2-expr-stmt-node' parent.  Finally, the list does not include
+functions or scripts, which are treated separately from statements
+by the JavaScript parser and runtime.")
+
+(defun js2-stmt-node-p (node)
+  "Heuristic for figuring out if NODE is a statement.
+Some node types can appear in either an expression context or a
+statement context, e.g. let-nodes, yield-nodes, and var-decl nodes.
+For these node types in a statement context, the parent will be a
+`js2-expr-stmt-node'.
+Functions aren't included in the check."
+  (memq (js2-node-type node) js2-stmt-node-types))
+
+(defun js2-mode-find-first-stmt (node)
+  "Search upward starting from NODE looking for a statement.
+For purposes of this function, a `js2-function-node' counts."
+  (while (not (or (js2-stmt-node-p node)
+                  (js2-function-node-p node)))
+    (setq node (js2-node-parent node)))
+  node)
+
+(defun js2-node-parent-stmt (node)
+  "Return the node's first ancestor that is a statement.
+Returns nil if NODE is a `js2-ast-root'.  Note that any expression
+appearing in a statement context will have a parent that is a
+`js2-expr-stmt-node' that will be returned by this function."
+  (let ((parent (js2-node-parent node)))
+    (if (or (null parent)
+            (js2-stmt-node-p parent)
+            (and (js2-function-node-p parent)
+                 (not (eq (js2-function-node-form parent)
+                          'FUNCTION_EXPRESSION))))
+        parent
+      (js2-node-parent-stmt parent))))
+
+;; In the Mozilla Rhino sources, Roshan James writes:
+;;  Does consistent-return analysis on the function body when strict mode is
+;;  enabled.
+;;
+;;    function (x) { return (x+1) }
+;;
+;;  is ok, but
+;;
+;;    function (x) { if (x < 0) return (x+1); }
+;;
+;;  is not because the function can potentially return a value when the
+;;  condition is satisfied and if not, the function does not explicitly
+;;  return a value.
+;;
+;;  This extends to checking mismatches such as "return" and "return <value>"
+;;  used in the same function. Warnings are not emitted if inconsistent
+;;  returns exist in code that can be statically shown to be unreachable.
+;;  Ex.
+;;    function (x) { while (true) { ... if (..) { return value } ... } }
+;;
+;;  emits no warning. However if the loop had a break statement, then a
+;;  warning would be emitted.
+;;
+;;  The consistency analysis looks at control structures such as loops, ifs,
+;;  switch, try-catch-finally blocks, examines the reachable code paths and
+;;  warns the user about an inconsistent set of termination possibilities.
+;;
+;;  These flags enumerate the possible ways a statement/function can
+;;  terminate. These flags are used by endCheck() and by the Parser to
+;;  detect inconsistent return usage.
+;;
+;;  END_UNREACHED is reserved for code paths that are assumed to always be
+;;  able to execute (example: throw, continue)
+;;
+;;  END_DROPS_OFF indicates if the statement can transfer control to the
+;;  next one. Statement such as return dont. A compound statement may have
+;;  some branch that drops off control to the next statement.
+;;
+;;  END_RETURNS indicates that the statement can return with no value.
+;;  END_RETURNS_VALUE indicates that the statement can return a value.
+;;
+;;  A compound statement such as
+;;  if (condition) {
+;;    return value;
+;;  }
+;;  Will be detected as (END_DROPS_OFF | END_RETURN_VALUE) by endCheck()
+
+(defconst js2-END_UNREACHED 0)
+(defconst js2-END_DROPS_OFF 1)
+(defconst js2-END_RETURNS 2)
+(defconst js2-END_RETURNS_VALUE 4)
+(defconst js2-END_YIELDS 8)
+
+(defun js2-has-consistent-return-usage (node)
+  "Check that every return usage in a function body is consistent.
+Returns t if the function satisfies strict mode requirement."
+  (let ((n (js2-end-check node)))
+    ;; either it doesn't return a value in any branch...
+    (or (js2-flag-not-set-p n js2-END_RETURNS_VALUE)
+        ;; or it returns a value (or is unreached) at every branch
+        (js2-flag-not-set-p n (logior js2-END_DROPS_OFF
+                                      js2-END_RETURNS
+                                      js2-END_YIELDS)))))
+
+(defun js2-end-check-if (node)
+  "Ensure that return usage in then/else blocks is consistent.
+If there is no else block, then the return statement can fall through.
+Returns logical OR of END_* flags"
+  (let ((th (js2-if-node-then-part node))
+        (el (js2-if-node-else-part node)))
+    (if (null th)
+        js2-END_UNREACHED
+      (logior (js2-end-check th) (if el
+                                     (js2-end-check el)
+                                   js2-END_DROPS_OFF)))))
+
+(defun js2-end-check-switch (node)
+  "Consistency of return statements is checked between the case statements.
+If there is no default, then the switch can fall through. If there is a
+default, we check to see if all code paths in the default return or if
+there is a code path that can fall through.
+Returns logical OR of END_* flags."
+  (let ((rv js2-END_UNREACHED)
+        default-case)
+    ;; examine the cases
+    (catch 'break
+      (dolist (c (js2-switch-node-cases node))
+        (if (js2-case-node-expr c)
+            (js2-set-flag rv (js2-end-check-block c))
+          (setq default-case c)
+          (throw 'break nil))))
+    ;; we don't care how the cases drop into each other
+    (js2-clear-flag rv js2-END_DROPS_OFF)
+    ;; examine the default
+    (js2-set-flag rv (if default-case
+                         (js2-end-check default-case)
+                       js2-END_DROPS_OFF))
+    rv))
+
+(defun js2-end-check-try (node)
+ "If the block has a finally, return consistency is checked in the
+finally block. If all code paths in the finally return, then the
+returns in the try-catch blocks don't matter. If there is a code path
+that does not return or if there is no finally block, the returns
+of the try and catch blocks are checked for mismatch.
+Returns logical OR of END_* flags."
+ (let ((finally (js2-try-node-finally-block node))
+       rv)
+   ;; check the finally if it exists
+   (setq rv (if finally
+                (js2-end-check (js2-finally-node-body finally))
+              js2-END_DROPS_OFF))
+   ;; If the finally block always returns, then none of the returns
+   ;; in the try or catch blocks matter.
+   (when (js2-flag-set-p rv js2-END_DROPS_OFF)
+     (js2-clear-flag rv js2-END_DROPS_OFF)
+     ;; examine the try block
+     (js2-set-flag rv (js2-end-check (js2-try-node-try-block node)))
+     ;; check each catch block
+     (dolist (cb (js2-try-node-catch-clauses node))
+       (js2-set-flag rv (js2-end-check cb))))
+   rv))
+
+(defun js2-end-check-loop (node)
+  "Return statement in the loop body must be consistent.
+The default assumption for any kind of a loop is that it will eventually
+terminate.  The only exception is a loop with a constant true condition.
+Code that follows such a loop is examined only if one can determine
+statically that there is a break out of the loop.
+
+    for(... ; ... ; ...) {}
+    for(... in ... ) {}
+    while(...) { }
+    do { } while(...)
+
+Returns logical OR of END_* flags."
+  (let ((rv (js2-end-check (js2-loop-node-body node)))
+        (condition (cond
+                    ((js2-while-node-p node)
+                     (js2-while-node-condition node))
+                     ((js2-do-node-p node)
+                      (js2-do-node-condition node))
+                     ((js2-for-node-p node)
+                      (js2-for-node-condition node)))))
+
+    ;; check to see if the loop condition is always true
+    (if (and condition
+             (eq (js2-always-defined-boolean-p condition) 'ALWAYS_TRUE))
+        (js2-clear-flag rv js2-END_DROPS_OFF))
+
+    ;; look for effect of breaks
+    (js2-set-flag rv (js2-node-get-prop node
+                                        'CONTROL_BLOCK_PROP
+                                        js2-END_UNREACHED))
+    rv))
+
+(defun js2-end-check-block (node)
+  "A general block of code is examined statement by statement.
+If any statement (even a compound one) returns in all branches, then
+subsequent statements are not examined.
+Returns logical OR of END_* flags."
+  (let* ((rv js2-END_DROPS_OFF)
+         (kids (js2-block-node-kids node))
+         (n (car kids)))
+    ;; Check each statment.  If the statement can continue onto the next
+    ;; one (i.e. END_DROPS_OFF is set), then check the next statement.
+    (while (and n (js2-flag-set-p rv js2-END_DROPS_OFF))
+      (js2-clear-flag rv js2-END_DROPS_OFF)
+      (js2-set-flag rv (js2-end-check n))
+      (setq kids (cdr kids)
+            n (car kids)))
+    rv))
+
+(defun js2-end-check-label (node)
+  "A labeled statement implies that there may be a break to the label.
+The function processes the labeled statement and then checks the
+CONTROL_BLOCK_PROP property to see if there is ever a break to the
+particular label.
+Returns logical OR of END_* flags."
+  (let ((rv (js2-end-check (js2-labeled-stmt-node-stmt node))))
+    (logior rv (js2-node-get-prop node
+                                  'CONTROL_BLOCK_PROP
+                                  js2-END_UNREACHED))))
+
+(defun js2-end-check-break (node)
+  "When a break is encountered annotate the statement being broken
+out of by setting its CONTROL_BLOCK_PROP property.
+Returns logical OR of END_* flags."
+  (and (js2-break-node-target node)
+       (js2-node-set-prop (js2-break-node-target node)
+                          'CONTROL_BLOCK_PROP
+                          js2-END_DROPS_OFF))
+  js2-END_UNREACHED)
+
+(defun js2-end-check (node)
+  "Examine the body of a function, doing a basic reachability analysis.
+Returns a combination of flags END_* flags that indicate
+how the function execution can terminate. These constitute only the
+pessimistic set of termination conditions. It is possible that at
+runtime certain code paths will never be actually taken. Hence this
+analysis will flag errors in cases where there may not be errors.
+Returns logical OR of END_* flags"
+  (let (kid)
+    (cond
+     ((js2-break-node-p node)
+      (js2-end-check-break node))
+     ((js2-expr-stmt-node-p node)
+      (if (setq kid (js2-expr-stmt-node-expr node))
+          (js2-end-check kid)
+        js2-END_DROPS_OFF))
+     ((or (js2-continue-node-p node)
+          (js2-throw-node-p node))
+      js2-END_UNREACHED)
+     ((js2-return-node-p node)
+      (if (setq kid (js2-return-node-retval node))
+          js2-END_RETURNS_VALUE
+        js2-END_RETURNS))
+     ((js2-loop-node-p node)
+      (js2-end-check-loop node))
+     ((js2-switch-node-p node)
+      (js2-end-check-switch node))
+     ((js2-labeled-stmt-node-p node)
+      (js2-end-check-label node))
+     ((js2-if-node-p node)
+      (js2-end-check-if node))
+     ((js2-try-node-p node)
+      (js2-end-check-try node))
+     ((js2-block-node-p node)
+      (if (null (js2-block-node-kids node))
+          js2-END_DROPS_OFF
+        (js2-end-check-block node)))
+     ((js2-yield-node-p node)
+      js2-END_YIELDS)
+     (t
+      js2-END_DROPS_OFF))))
+
+(defun js2-always-defined-boolean-p (node)
+  "Check if NODE always evaluates to true or false in boolean context.
+Returns 'ALWAYS_TRUE, 'ALWAYS_FALSE, or nil if it's neither always true
+nor always false."
+  (let ((tt (js2-node-type node))
+        num)
+    (cond
+     ((or (= tt js2-FALSE) (= tt js2-NULL))
+      'ALWAYS_FALSE)
+     ((= tt js2-TRUE)
+      'ALWAYS_TRUE)
+     ((= tt js2-NUMBER)
+      (setq num (js2-number-node-num-value node))
+      (if (and (not (eq num 0.0e+NaN))
+               (not (zerop num)))
+          'ALWAYS_TRUE
+        'ALWAYS_FALSE))
+     (t
+      nil))))
+
+;;; Scanner -- a port of Mozilla Rhino's lexer.
+;; Corresponds to Rhino files Token.java and TokenStream.java.
+
+(defvar js2-tokens nil
+  "List of all defined token names.")  ; initialized in `js2-token-names'
+
+(defconst js2-token-names
+  (let* ((names (make-vector js2-num-tokens -1))
+         (case-fold-search nil)  ; only match js2-UPPER_CASE
+         (syms (apropos-internal "^js2-\\(?:[[:upper:]_]+\\)")))
+    (cl-loop for sym in syms
+             for i from 0
+             do
+             (unless (or (memq sym '(js2-EOF_CHAR js2-ERROR))
+                         (not (boundp sym)))
+               (aset names (symbol-value sym)           ; code, e.g. 152
+                     (downcase
+                      (substring (symbol-name sym) 4))) ; name, e.g. "let"
+               (push sym js2-tokens)))
+    names)
+  "Vector mapping int values to token string names, sans `js2-' prefix.")
+
+(defun js2-tt-name (tok)
+  "Return a string name for TOK, a token symbol or code.
+Signals an error if it's not a recognized token."
+  (let ((code tok))
+    (if (symbolp tok)
+        (setq code (symbol-value tok)))
+    (if (eq code -1)
+        "ERROR"
+      (if (and (numberp code)
+               (not (cl-minusp code))
+               (< code js2-num-tokens))
+          (aref js2-token-names code)
+        (error "Invalid token: %s" code)))))
+
+(defsubst js2-tt-sym (tok)
+  "Return symbol for TOK given its code, e.g. 'js2-LP for code 86."
+  (intern (js2-tt-name tok)))
+
+(defconst js2-token-codes
+  (let ((table (make-hash-table :test 'eq :size 256)))
+    (cl-loop for name across js2-token-names
+             for sym = (intern (concat "js2-" (upcase name)))
+             do
+             (puthash sym (symbol-value sym) table))
+    ;; clean up a few that are "wrong" in Rhino's token codes
+    (puthash 'js2-DELETE js2-DELPROP table)
+    table)
+  "Hashtable mapping token type symbols to their bytecodes.")
+
+(defsubst js2-tt-code (sym)
+  "Return code for token symbol SYM, e.g. 86 for 'js2-LP."
+  (or (gethash sym js2-token-codes)
+      (error "Invalid token symbol: %s " sym)))  ; signal code bug
+
+(defun js2-report-scan-error (msg &optional no-throw beg len)
+  (setf (js2-token-end (js2-current-token)) js2-ts-cursor)
+  (js2-report-error msg nil
+                    (or beg (js2-current-token-beg))
+                    (or len (js2-current-token-len)))
+  (unless no-throw
+    (throw 'return js2-ERROR)))
+
+(defun js2-set-string-from-buffer (token)
+  "Set `string' and `end' slots for TOKEN, return the string."
+  (setf (js2-token-end token) js2-ts-cursor
+        (js2-token-string token) (js2-collect-string js2-ts-string-buffer)))
+
+;; TODO:  could potentially avoid a lot of consing by allocating a
+;; char buffer the way Rhino does.
+(defsubst js2-add-to-string (c)
+  (push c js2-ts-string-buffer))
+
+;; Note that when we "read" the end-of-file, we advance js2-ts-cursor
+;; to (1+ (point-max)), which lets the scanner treat end-of-file like
+;; any other character:  when it's not part of the current token, we
+;; unget it, allowing it to be read again by the following call.
+(defsubst js2-unget-char ()
+  (cl-decf js2-ts-cursor))
+
+;; Rhino distinguishes \r and \n line endings.  We don't need to
+;; because we only scan from Emacs buffers, which always use \n.
+(defun js2-get-char ()
+  "Read and return the next character from the input buffer.
+Increments `js2-ts-lineno' if the return value is a newline char.
+Updates `js2-ts-cursor' to the point after the returned char.
+Returns `js2-EOF_CHAR' if we hit the end of the buffer.
+Also updates `js2-ts-hit-eof' and `js2-ts-line-start' as needed."
+  (let (c)
+    ;; check for end of buffer
+    (if (>= js2-ts-cursor (point-max))
+        (setq js2-ts-hit-eof t
+              js2-ts-cursor (1+ js2-ts-cursor)
+              c js2-EOF_CHAR)  ; return value
+      ;; otherwise read next char
+      (setq c (char-before (cl-incf js2-ts-cursor)))
+      ;; if we read a newline, update counters
+      (if (= c ?\n)
+          (setq js2-ts-line-start js2-ts-cursor
+                js2-ts-lineno (1+ js2-ts-lineno)))
+      ;; TODO:  skip over format characters
+      c)))
+
+(defun js2-read-unicode-escape ()
+  "Read a \\uNNNN sequence from the input.
+Assumes the ?\ and ?u have already been read.
+Returns the unicode character, or nil if it wasn't a valid character.
+Doesn't change the values of any scanner variables."
+  ;; I really wish I knew a better way to do this, but I can't
+  ;; find the Emacs function that takes a 16-bit int and converts
+  ;; it to a Unicode/utf-8 character.  So I basically eval it with (read).
+  ;; Have to first check that it's 4 hex characters or it may stop
+  ;; the read early.
+  (ignore-errors
+    (let ((s (buffer-substring-no-properties js2-ts-cursor
+                                             (+ 4 js2-ts-cursor))))
+      (if (string-match "[0-9a-fA-F]\\{4\\}" s)
+          (read (concat "?\\u" s))))))
+
+(defun js2-match-char (test)
+  "Consume and return next character if it matches TEST, a character.
+Returns nil and consumes nothing if TEST is not the next character."
+  (let ((c (js2-get-char)))
+    (if (eq c test)
+        t
+      (js2-unget-char)
+      nil)))
+
+(defun js2-peek-char ()
+  (prog1
+      (js2-get-char)
+    (js2-unget-char)))
+
+(defun js2-identifier-start-p (c)
+  "Is C a valid start to an ES5 Identifier?
+See http://es5.github.io/#x7.6"
+  (or
+   (memq c '(?$ ?_))
+   (memq (get-char-code-property c 'general-category)
+         ;; Letters
+         '(Lu Ll Lt Lm Lo Nl))))
+
+(defun js2-identifier-part-p (c)
+  "Is C a valid part of an ES5 Identifier?
+See http://es5.github.io/#x7.6"
+  (or
+   (memq c '(?$ ?_ ?\u200c  ?\u200d))
+   (memq (get-char-code-property c 'general-category)
+         '(;; Letters
+           Lu Ll Lt Lm Lo Nl
+           ;; Combining Marks
+           Mn Mc
+           ;; Digits
+           Nd
+           ;; Connector Punctuation
+           Pc))))
+
+(defun js2-alpha-p (c)
+  (cond ((and (<= ?A c) (<= c ?Z)) t)
+        ((and (<= ?a c) (<= c ?z)) t)
+        (t nil)))
+
+(defsubst js2-digit-p (c)
+  (and (<= ?0 c) (<= c ?9)))
+
+(defun js2-js-space-p (c)
+  (if (<= c 127)
+      (memq c '(#x20 #x9 #xB #xC #xD))
+    (or
+     (eq c #xA0)
+     ;; TODO:  change this nil to check for Unicode space character
+     nil)))
+
+(defconst js2-eol-chars (list js2-EOF_CHAR ?\n ?\r))
+
+(defun js2-skip-line ()
+  "Skip to end of line."
+  (while (not (memq (js2-get-char) js2-eol-chars)))
+  (js2-unget-char)
+  (setf (js2-token-end (js2-current-token)) js2-ts-cursor)
+  (setq js2-token-end js2-ts-cursor))
+
+(defun js2-init-scanner (&optional buf line)
+  "Create token stream for BUF starting on LINE.
+BUF defaults to `current-buffer' and LINE defaults to 1.
+
+A buffer can only have one scanner active at a time, which yields
+dramatically simpler code than using a defstruct.  If you need to
+have simultaneous scanners in a buffer, copy the regions to scan
+into temp buffers."
+  (with-current-buffer (or buf (current-buffer))
+    (setq js2-ts-dirty-line nil
+          js2-ts-hit-eof nil
+          js2-ts-line-start 0
+          js2-ts-lineno (or line 1)
+          js2-ts-line-end-char -1
+          js2-ts-cursor (point-min)
+          js2-ti-tokens (make-vector js2-ti-ntokens nil)
+          js2-ti-tokens-cursor 0
+          js2-ti-lookahead 0
+          js2-ts-is-xml-attribute nil
+          js2-ts-xml-is-tag-content nil
+          js2-ts-xml-open-tags-count 0
+          js2-ts-string-buffer nil)))
+
+;; This function uses the cached op, string and number fields in
+;; TokenStream; if getToken has been called since the passed token
+;; was scanned, the op or string printed may be incorrect.
+(defun js2-token-to-string (token)
+  ;; Not sure where this function is used in Rhino.  Not tested.
+  (if (not js2-debug-print-trees)
+      ""
+    (let ((name (js2-tt-name token)))
+      (cond
+       ((memq token '(js2-STRING js2-REGEXP js2-NAME
+                      js2-TEMPLATE_HEAD js2-NO_SUBS_TEMPLATE))
+        (concat name " `" (js2-current-token-string) "'"))
+       ((eq token js2-NUMBER)
+        (format "NUMBER %g" (js2-token-number (js2-current-token))))
+       (t
+        name)))))
+
+(defconst js2-keywords
+  '(break
+    case catch class const continue
+    debugger default delete do
+    else extends export
+    false finally for function
+    if in instanceof import
+    let
+    new null
+    return
+    static super switch
+    this throw true try typeof
+    var void
+    while with
+    yield))
+
+;; Token names aren't exactly the same as the keywords, unfortunately.
+;; E.g. delete is js2-DELPROP.
+(defconst js2-kwd-tokens
+  (let ((table (make-vector js2-num-tokens nil))
+        (tokens
+         (list js2-BREAK
+               js2-CASE js2-CATCH js2-CLASS js2-CONST js2-CONTINUE
+               js2-DEBUGGER js2-DEFAULT js2-DELPROP js2-DO
+               js2-ELSE js2-EXPORT
+               js2-ELSE js2-EXTENDS js2-EXPORT
+               js2-FALSE js2-FINALLY js2-FOR js2-FUNCTION
+               js2-IF js2-IN js2-INSTANCEOF js2-IMPORT
+               js2-LET
+               js2-NEW js2-NULL
+               js2-RETURN
+               js2-STATIC js2-SUPER js2-SWITCH
+               js2-THIS js2-THROW js2-TRUE js2-TRY js2-TYPEOF
+               js2-VAR
+               js2-WHILE js2-WITH
+               js2-YIELD)))
+    (dolist (i tokens)
+      (aset table i 'font-lock-keyword-face))
+    (aset table js2-STRING 'font-lock-string-face)
+    (aset table js2-REGEXP 'font-lock-string-face)
+    (aset table js2-NO_SUBS_TEMPLATE 'font-lock-string-face)
+    (aset table js2-TEMPLATE_HEAD 'font-lock-string-face)
+    (aset table js2-COMMENT 'font-lock-comment-face)
+    (aset table js2-THIS 'font-lock-builtin-face)
+    (aset table js2-SUPER 'font-lock-builtin-face)
+    (aset table js2-VOID 'font-lock-constant-face)
+    (aset table js2-NULL 'font-lock-constant-face)
+    (aset table js2-TRUE 'font-lock-constant-face)
+    (aset table js2-FALSE 'font-lock-constant-face)
+    (aset table js2-NOT 'font-lock-negation-char-face)
+    table)
+  "Vector whose values are non-nil for tokens that are keywords.
+The values are default faces to use for highlighting the keywords.")
+
+;; FIXME: Support strict mode-only future reserved words, after we know
+;; which parts scopes are in strict mode, and which are not.
+(defconst js2-reserved-words '(class enum export extends import super)
+  "Future reserved keywords in ECMAScript 5.1.")
+
+(defconst js2-keyword-names
+  (let ((table (make-hash-table :test 'equal)))
+    (cl-loop for k in js2-keywords
+             do (puthash
+                 (symbol-name k)                            ; instanceof
+                 (intern (concat "js2-"
+                                 (upcase (symbol-name k)))) ; js2-INSTANCEOF
+                 table))
+    table)
+  "JavaScript keywords by name, mapped to their symbols.")
+
+(defconst js2-reserved-word-names
+  (let ((table (make-hash-table :test 'equal)))
+    (cl-loop for k in js2-reserved-words
+             do
+             (puthash (symbol-name k) 'js2-RESERVED table))
+    table)
+  "JavaScript reserved words by name, mapped to 'js2-RESERVED.")
+
+(defun js2-collect-string (buf)
+  "Convert BUF, a list of chars, to a string.
+Reverses BUF before converting."
+  (if buf
+      (apply #'string (nreverse buf))
+    ""))
+
+(defun js2-string-to-keyword (s)
+  "Return token for S, a string, if S is a keyword or reserved word.
+Returns a symbol such as 'js2-BREAK, or nil if not keyword/reserved."
+  (or (gethash s js2-keyword-names)
+      (gethash s js2-reserved-word-names)))
+
+(defsubst js2-ts-set-char-token-bounds (token)
+  "Used when next token is one character."
+  (setf (js2-token-beg token) (1- js2-ts-cursor)
+        (js2-token-end token) js2-ts-cursor))
+
+(defsubst js2-ts-return (token type)
+  "Update the `end' and `type' slots of TOKEN,
+then throw `return' with value TYPE."
+  (setf (js2-token-end token) js2-ts-cursor
+        (js2-token-type token) type)
+  (throw 'return type))
+
+(defun js2-x-digit-to-int (c accumulator)
+  "Build up a hex number.
+If C is a hexadecimal digit, return ACCUMULATOR * 16 plus
+corresponding number.  Otherwise return -1."
+  (catch 'return
+    (catch 'check
+      ;; Use 0..9 < A..Z < a..z
+      (cond
+       ((<= c ?9)
+        (cl-decf c ?0)
+        (if (<= 0 c)
+            (throw 'check nil)))
+       ((<= c ?F)
+        (when (<= ?A c)
+          (cl-decf c (- ?A 10))
+          (throw 'check nil)))
+       ((<= c ?f)
+        (when (<= ?a c)
+          (cl-decf c (- ?a 10))
+          (throw 'check nil))))
+      (throw 'return -1))
+    (logior c (lsh accumulator 4))))
+
+(defun js2-get-token (&optional modifier)
+  "If `js2-ti-lookahead' is zero, call scanner to get new token.
+Otherwise, move `js2-ti-tokens-cursor' and return the type of
+next saved token.
+
+This function will not return a newline (js2-EOL) - instead, it
+gobbles newlines until it finds a non-newline token.  Call
+`js2-peek-token-or-eol' when you care about newlines.
+
+This function will also not return a js2-COMMENT.  Instead, it
+records comments found in `js2-scanned-comments'.  If the token
+returned by this function immediately follows a jsdoc comment,
+the token is flagged as such."
+  (if (zerop js2-ti-lookahead)
+      (js2-get-token-internal modifier)
+    (cl-decf js2-ti-lookahead)
+    (setq js2-ti-tokens-cursor (mod (1+ js2-ti-tokens-cursor) js2-ti-ntokens))
+    (let ((tt (js2-current-token-type)))
+      (cl-assert (not (= tt js2-EOL)))
+      tt)))
+
+(defun js2-unget-token ()
+  (cl-assert (< js2-ti-lookahead js2-ti-max-lookahead))
+  (cl-incf js2-ti-lookahead)
+  (setq js2-ti-tokens-cursor (mod (1- js2-ti-tokens-cursor) js2-ti-ntokens)))
+
+(defun js2-get-token-internal (modifier)
+  (let* ((token (js2-get-token-internal-1 modifier)) ; call scanner
+         (tt (js2-token-type token))
+         saw-eol
+         face)
+    ;; process comments
+    (while (or (= tt js2-EOL) (= tt js2-COMMENT))
+      (if (= tt js2-EOL)
+          (setq saw-eol t)
+        (setq saw-eol nil)
+        (when js2-record-comments
+          (js2-record-comment token)))
+      (setq js2-ti-tokens-cursor (mod (1- js2-ti-tokens-cursor) js2-ti-ntokens))
+      (setq token (js2-get-token-internal-1 modifier) ; call scanner again
+            tt (js2-token-type token)))
+
+    (when saw-eol
+      (setf (js2-token-follows-eol-p token) t))
+
+    ;; perform lexical fontification as soon as token is scanned
+    (when js2-parse-ide-mode
+      (cond
+       ((cl-minusp tt)
+        (js2-record-face 'js2-error token))
+       ((setq face (aref js2-kwd-tokens tt))
+        (js2-record-face face token))
+       ((and (= tt js2-NAME)
+             (equal (js2-token-string token) "undefined"))
+        (js2-record-face 'font-lock-constant-face token))))
+    tt))
+
+(defsubst js2-string-to-number (str base)
+  ;; TODO:  Maybe port ScriptRuntime.stringToNumber.
+  (condition-case nil
+      (string-to-number str base)
+    (overflow-error -1)))
+
+(defun js2-get-token-internal-1 (modifier)
+  "Return next JavaScript token type, an int such as js2-RETURN.
+During operation, creates an instance of `js2-token' struct, sets
+its relevant fields and puts it into `js2-ti-tokens'."
+  (let (identifier-start
+        is-unicode-escape-start c c1
+        contains-escape escape-val str result base
+        quote-char val look-for-slash continue tt
+        (token (js2-new-token 0)))
+    (setq
+     tt
+     (catch 'return
+       (when (eq modifier 'TEMPLATE_TAIL)
+         (setf (js2-token-beg token) (1- js2-ts-cursor))
+         (throw 'return (js2-get-string-or-template-token ?` token)))
+       (while t
+         ;; Eat whitespace, possibly sensitive to newlines.
+         (setq continue t)
+         (while continue
+           (setq c (js2-get-char))
+           (cond
+            ((eq c js2-EOF_CHAR)
+             (js2-unget-char)
+             (js2-ts-set-char-token-bounds token)
+             (throw 'return js2-EOF))
+            ((eq c ?\n)
+             (js2-ts-set-char-token-bounds token)
+             (setq js2-ts-dirty-line nil)
+             (throw 'return js2-EOL))
+            ((not (js2-js-space-p c))
+             (if (/= c ?-)              ; in case end of HTML comment
+                 (setq js2-ts-dirty-line t))
+             (setq continue nil))))
+         ;; Assume the token will be 1 char - fixed up below.
+         (js2-ts-set-char-token-bounds token)
+         (when (eq c ?@)
+           (throw 'return js2-XMLATTR))
+         ;; identifier/keyword/instanceof?
+         ;; watch out for starting with a <backslash>
+         (cond
+          ((eq c ?\\)
+           (setq c (js2-get-char))
+           (if (eq c ?u)
+               (setq identifier-start t
+                     is-unicode-escape-start t
+                     js2-ts-string-buffer nil)
+             (setq identifier-start nil)
+             (js2-unget-char)
+             (setq c ?\\)))
+          (t
+           (when (setq identifier-start (js2-identifier-start-p c))
+             (setq js2-ts-string-buffer nil)
+             (js2-add-to-string c))))
+         (when identifier-start
+           (setq contains-escape is-unicode-escape-start)
+           (catch 'break
+             (while t
+               (if is-unicode-escape-start
+                   ;; strictly speaking we should probably push-back
+                   ;; all the bad characters if the <backslash>uXXXX
+                   ;; sequence is malformed. But since there isn't a
+                   ;; correct context(is there?) for a bad Unicode
+                   ;; escape sequence in an identifier, we can report
+                   ;; an error here.
+                   (progn
+                     (setq escape-val 0)
+                     (dotimes (_ 4)
+                       (setq c (js2-get-char)
+                             escape-val (js2-x-digit-to-int c escape-val))
+                       ;; Next check takes care of c < 0 and bad escape
+                       (if (cl-minusp escape-val)
+                           (throw 'break nil)))
+                     (if (cl-minusp escape-val)
+                         (js2-report-scan-error "msg.invalid.escape" t))
+                     (js2-add-to-string escape-val)
+                     (setq is-unicode-escape-start nil))
+                 (setq c (js2-get-char))
+                 (cond
+                  ((eq c ?\\)
+                   (setq c (js2-get-char))
+                   (if (eq c ?u)
+                       (setq is-unicode-escape-start t
+                             contains-escape t)
+                     (js2-report-scan-error "msg.illegal.character" t)))
+                  (t
+                   (if (or (eq c js2-EOF_CHAR)
+                           (not (js2-identifier-part-p c)))
+                       (throw 'break nil))
+                   (js2-add-to-string c))))))
+           (js2-unget-char)
+           (setf str (js2-collect-string js2-ts-string-buffer)
+                 (js2-token-end token) js2-ts-cursor)
+           ;; FIXME: Invalid in ES5 and ES6, see
+           ;; https://bugzilla.mozilla.org/show_bug.cgi?id=694360
+           ;; Probably should just drop this conditional.
+           (unless contains-escape
+             ;; OPT we shouldn't have to make a string (object!) to
+             ;; check if it's a keyword.
+             ;; Return the corresponding token if it's a keyword
+             (when (and (not (eq modifier 'KEYWORD_IS_NAME))
+                        (setq result (js2-string-to-keyword str)))
+               (if (and (< js2-language-version 170)
+                        (memq result '(js2-LET js2-YIELD)))
+                   ;; LET and YIELD are tokens only in 1.7 and later
+                   (setq result 'js2-NAME))
+               (when (eq result 'js2-RESERVED)
+                 (setf (js2-token-string token) str))
+               (throw 'return (js2-tt-code result))))
+           ;; If we want to intern these as Rhino does, just use (intern str)
+           (setf (js2-token-string token) str)
+           (throw 'return js2-NAME))    ; end identifier/kwd check
+         ;; is it a number?
+         (when (or (js2-digit-p c)
+                   (and (eq c ?.) (js2-digit-p (js2-peek-char))))
+           (setq js2-ts-string-buffer nil
+                 base 10)
+           (when (eq c ?0)
+             (setq c (js2-get-char))
+             (cond
+              ((or (eq c ?x) (eq c ?X))
+               (setq base 16)
+               (setq c (js2-get-char)))
+              ((and (or (eq c ?b) (eq c ?B))
+                    (>= js2-language-version 200))
+               (setq base 2)
+               (setq c (js2-get-char)))
+              ((and (or (eq c ?o) (eq c ?O))
+                    (>= js2-language-version 200))
+               (setq base 8)
+               (setq c (js2-get-char)))
+              ((js2-digit-p c)
+               (setq base 'maybe-8))
+              (t
+               (js2-add-to-string ?0))))
+           (cond
+            ((eq base 16)
+             (if (> 0 (js2-x-digit-to-int c 0))
+                 (js2-report-scan-error "msg.missing.hex.digits")
+               (while (<= 0 (js2-x-digit-to-int c 0))
+                 (js2-add-to-string c)
+                 (setq c (js2-get-char)))))
+            ((eq base 2)
+             (if (not (memq c '(?0 ?1)))
+                 (js2-report-scan-error "msg.missing.binary.digits")
+               (while (memq c '(?0 ?1))
+                 (js2-add-to-string c)
+                 (setq c (js2-get-char)))))
+            ((eq base 8)
+             (if (or (> ?0 c) (< ?7 c))
+                 (js2-report-scan-error "msg.missing.octal.digits")
+               (while (and (<= ?0 c) (>= ?7 c))
+                 (js2-add-to-string c)
+                 (setq c (js2-get-char)))))
+            (t
+             (while (and (<= ?0 c) (<= c ?9))
+               ;; We permit 08 and 09 as decimal numbers, which
+               ;; makes our behavior a superset of the ECMA
+               ;; numeric grammar.  We might not always be so
+               ;; permissive, so we warn about it.
+               (when (and (eq base 'maybe-8) (>= c ?8))
+                 (js2-report-warning "msg.bad.octal.literal"
+                                     (if (eq c ?8) "8" "9"))
+                 (setq base 10))
+               (js2-add-to-string c)
+               (setq c (js2-get-char)))
+             (when (eq base 'maybe-8)
+               (setq base 8))))
+           (when (and (eq base 10) (memq c '(?. ?e ?E)))
+             (when (eq c ?.)
+               (cl-loop do
+                        (js2-add-to-string c)
+                        (setq c (js2-get-char))
+                        while (js2-digit-p c)))
+             (when (memq c '(?e ?E))
+               (js2-add-to-string c)
+               (setq c (js2-get-char))
+               (when (memq c '(?+ ?-))
+                 (js2-add-to-string c)
+                 (setq c (js2-get-char)))
+               (unless (js2-digit-p c)
+                 (js2-report-scan-error "msg.missing.exponent" t))
+               (cl-loop do
+                        (js2-add-to-string c)
+                        (setq c (js2-get-char))
+                        while (js2-digit-p c))))
+           (js2-unget-char)
+           (let ((str (js2-set-string-from-buffer token)))
+             (setf (js2-token-number token)
+                   (js2-string-to-number str base)))
+           (throw 'return js2-NUMBER))
+         ;; is it a string?
+         (when (or (memq c '(?\" ?\'))
+                   (and (>= js2-language-version 200)
+                        (= c ?`)))
+           (throw 'return
+                  (js2-get-string-or-template-token c token)))
+         (js2-ts-return token
+                        (cl-case c
+                          (?\;
+                           (throw 'return js2-SEMI))
+                          (?\[
+                           (throw 'return js2-LB))
+                          (?\]
+                           (throw 'return js2-RB))
+                          (?{
+                           (throw 'return js2-LC))
+                          (?}
+                           (throw 'return js2-RC))
+                          (?\(
+                           (throw 'return js2-LP))
+                          (?\)
+                           (throw 'return js2-RP))
+                          (?,
+                           (throw 'return js2-COMMA))
+                          (??
+                           (throw 'return js2-HOOK))
+                          (?:
+                           (if (js2-match-char ?:)
+                               js2-COLONCOLON
+                             (throw 'return js2-COLON)))
+                          (?.
+                           (if (js2-match-char ?.)
+                               (if (js2-match-char ?.)
+                                   js2-TRIPLEDOT js2-DOTDOT)
+                             (if (js2-match-char ?\()
+                                 js2-DOTQUERY
+                               (throw 'return js2-DOT))))
+                          (?|
+                           (if (js2-match-char ?|)
+                               (throw 'return js2-OR)
+                             (if (js2-match-char ?=)
+                                 js2-ASSIGN_BITOR
+                               (throw 'return js2-BITOR))))
+                          (?^
+                           (if (js2-match-char ?=)
+                               js2-ASSIGN_BITOR
+                             (throw 'return js2-BITXOR)))
+                          (?&
+                           (if (js2-match-char ?&)
+                               (throw 'return js2-AND)
+                             (if (js2-match-char ?=)
+                                 js2-ASSIGN_BITAND
+                               (throw 'return js2-BITAND))))
+                          (?=
+                           (if (js2-match-char ?=)
+                               (if (js2-match-char ?=)
+                                   js2-SHEQ
+                                 (throw 'return js2-EQ))
+                             (if (js2-match-char ?>)
+                                 (js2-ts-return token js2-ARROW)
+                               (throw 'return js2-ASSIGN))))
+                          (?!
+                           (if (js2-match-char ?=)
+                               (if (js2-match-char ?=)
+                                   js2-SHNE
+                                 js2-NE)
+                             (throw 'return js2-NOT)))
+                          (?<
+                           ;; NB:treat HTML begin-comment as comment-till-eol
+                           (when (js2-match-char ?!)
+                             (when (js2-match-char ?-)
+                               (when (js2-match-char ?-)
+                                 (js2-skip-line)
+                                 (setf (js2-token-comment-type (js2-current-token)) 'html)
+                                 (throw 'return js2-COMMENT)))
+                             (js2-unget-char))
+                           (if (js2-match-char ?<)
+                               (if (js2-match-char ?=)
+                                   js2-ASSIGN_LSH
+                                 js2-LSH)
+                             (if (js2-match-char ?=)
+                                 js2-LE
+                               (throw 'return js2-LT))))
+                          (?>
+                           (if (js2-match-char ?>)
+                               (if (js2-match-char ?>)
+                                   (if (js2-match-char ?=)
+                                       js2-ASSIGN_URSH
+                                     js2-URSH)
+                                 (if (js2-match-char ?=)
+                                     js2-ASSIGN_RSH
+                                   js2-RSH))
+                             (if (js2-match-char ?=)
+                                 js2-GE
+                               (throw 'return js2-GT))))
+                          (?*
+                           (if (js2-match-char ?=)
+                               js2-ASSIGN_MUL
+                             (throw 'return js2-MUL)))
+                          (?/
+                           ;; is it a // comment?
+                           (when (js2-match-char ?/)
+                             (setf (js2-token-beg token) (- js2-ts-cursor 2))
+                             (js2-skip-line)
+                             (setf (js2-token-comment-type token) 'line)
+                             ;; include newline so highlighting goes to end of window
+                             (cl-incf (js2-token-end token))
+                             (throw 'return js2-COMMENT))
+                           ;; is it a /* comment?
+                           (when (js2-match-char ?*)
+                             (setf look-for-slash nil
+                                   (js2-token-beg token) (- js2-ts-cursor 2)
+                                   (js2-token-comment-type token)
+                                   (if (js2-match-char ?*)
+                                       (progn
+                                         (setq look-for-slash t)
+                                         'jsdoc)
+                                     'block))
+                             (while t
+                               (setq c (js2-get-char))
+                               (cond
+                                ((eq c js2-EOF_CHAR)
+                                 (setf (js2-token-end token) (1- js2-ts-cursor))
+                                 (js2-report-error "msg.unterminated.comment")
+                                 (throw 'return js2-COMMENT))
+                                ((eq c ?*)
+                                 (setq look-for-slash t))
+                                ((eq c ?/)
+                                 (if look-for-slash
+                                     (js2-ts-return token js2-COMMENT)))
+                                (t
+                                 (setf look-for-slash nil
+                                       (js2-token-end token) js2-ts-cursor)))))
+                           (if (js2-match-char ?=)
+                               js2-ASSIGN_DIV
+                             (throw 'return js2-DIV)))
+                          (?#
+                           (when js2-skip-preprocessor-directives
+                             (js2-skip-line)
+                             (setf (js2-token-comment-type token) 'preprocessor
+                                   (js2-token-end token) js2-ts-cursor)
+                             (throw 'return js2-COMMENT))
+                           (throw 'return js2-ERROR))
+                          (?%
+                           (if (js2-match-char ?=)
+                               js2-ASSIGN_MOD
+                             (throw 'return js2-MOD)))
+                          (?~
+                           (throw 'return js2-BITNOT))
+                          (?+
+                           (if (js2-match-char ?=)
+                               js2-ASSIGN_ADD
+                             (if (js2-match-char ?+)
+                                 js2-INC
+                               (throw 'return js2-ADD))))
+                          (?-
+                           (cond
+                            ((js2-match-char ?=)
+                             (setq c js2-ASSIGN_SUB))
+                            ((js2-match-char ?-)
+                             (unless js2-ts-dirty-line
+                               ;; treat HTML end-comment after possible whitespace
+                               ;; after line start as comment-until-eol
+                               (when (js2-match-char ?>)
+                                 (js2-skip-line)
+                                 (setf (js2-token-comment-type (js2-current-token)) 'html)
+                                 (throw 'return js2-COMMENT)))
+                             (setq c js2-DEC))
+                            (t
+                             (setq c js2-SUB)))
+                           (setq js2-ts-dirty-line t)
+                           c)
+                          (otherwise
+                           (js2-report-scan-error "msg.illegal.character")))))))
+    (setf (js2-token-type token) tt)
+    token))
+
+(defun js2-get-string-or-template-token (quote-char token)
+  ;; We attempt to accumulate a string the fast way, by
+  ;; building it directly out of the reader.  But if there
+  ;; are any escaped characters in the string, we revert to
+  ;; building it out of a string buffer.
+  (let ((c (js2-get-char))
+        js2-ts-string-buffer
+        nc)
+    (catch 'break
+      (while (/= c quote-char)
+        (catch 'continue
+          (when (eq c js2-EOF_CHAR)
+            (js2-unget-char)
+            (js2-report-error "msg.unterminated.string.lit")
+            (throw 'break nil))
+          (when (and (eq c ?\n) (not (eq quote-char ?`)))
+            (js2-unget-char)
+            (js2-report-error "msg.unterminated.string.lit")
+            (throw 'break nil))
+          (when (eq c ?\\)
+            ;; We've hit an escaped character
+            (setq c (js2-get-char))
+            (cl-case c
+              (?b (setq c ?\b))
+              (?f (setq c ?\f))
+              (?n (setq c ?\n))
+              (?r (setq c ?\r))
+              (?t (setq c ?\t))
+              (?v (setq c ?\v))
+              (?u
+               (setq c1 (js2-read-unicode-escape))
+               (if js2-parse-ide-mode
+                   (if c1
+                       (progn
+                         ;; just copy the string in IDE-mode
+                         (js2-add-to-string ?\\)
+                         (js2-add-to-string ?u)
+                         (dotimes (_ 3)
+                           (js2-add-to-string (js2-get-char)))
+                         (setq c (js2-get-char))) ; added at end of loop
+                     ;; flag it as an invalid escape
+                     (js2-report-warning "msg.invalid.escape"
+                                         nil (- js2-ts-cursor 2) 6))
+                 ;; Get 4 hex digits; if the u escape is not
+                 ;; followed by 4 hex digits, use 'u' + the
+                 ;; literal character sequence that follows.
+                 (js2-add-to-string ?u)
+                 (setq escape-val 0)
+                 (dotimes (_ 4)
+                   (setq c (js2-get-char)
+                         escape-val (js2-x-digit-to-int c escape-val))
+                   (if (cl-minusp escape-val)
+                       (throw 'continue nil))
+                   (js2-add-to-string c))
+                 ;; prepare for replace of stored 'u' sequence by escape value
+                 (setq js2-ts-string-buffer (nthcdr 5 js2-ts-string-buffer)
+                       c escape-val)))
+              (?x
+               ;; Get 2 hex digits, defaulting to 'x'+literal
+               ;; sequence, as above.
+               (setq c (js2-get-char)
+                     escape-val (js2-x-digit-to-int c 0))
+               (if (cl-minusp escape-val)
+                   (progn
+                     (js2-add-to-string ?x)
+                     (throw 'continue nil))
+                 (setq c1 c
+                       c (js2-get-char)
+                       escape-val (js2-x-digit-to-int c escape-val))
+                 (if (cl-minusp escape-val)
+                     (progn
+                       (js2-add-to-string ?x)
+                       (js2-add-to-string c1)
+                       (throw 'continue nil))
+                   ;; got 2 hex digits
+                   (setq c escape-val))))
+              (?\n
+               ;; Remove line terminator after escape to follow
+               ;; SpiderMonkey and C/C++
+               (setq c (js2-get-char))
+               (throw 'continue nil))
+              (t
+               (when (and (<= ?0 c) (< c ?8))
+                 (setq val (- c ?0)
+                       c (js2-get-char))
+                 (when (and (<= ?0 c) (< c ?8))
+                   (setq val (- (+ (* 8 val) c) ?0)
+                         c (js2-get-char))
+                   (when (and (<= ?0 c)
+                              (< c ?8)
+                              (< val #o37))
+                     ;; c is 3rd char of octal sequence only
+                     ;; if the resulting val <= 0377
+                     (setq val (- (+ (* 8 val) c) ?0)
+                           c (js2-get-char))))
+                 (js2-unget-char)
+                 (setq c val)))))
+          (when (and (eq quote-char ?`) (eq c ?$))
+            (when (eq (setq nc (js2-get-char)) ?\{)
+              (throw 'break nil))
+            (js2-unget-char))
+          (js2-add-to-string c)
+          (setq c (js2-get-char)))))
+    (js2-set-string-from-buffer token)
+    (if (not (eq quote-char ?`))
+        js2-STRING
+      (if (and (eq c ?$) (eq nc ?\{))
+          js2-TEMPLATE_HEAD
+        js2-NO_SUBS_TEMPLATE))))
+
+(defun js2-read-regexp (start-tt)
+  "Called by parser when it gets / or /= in literal context."
+  (let (c err
+        in-class  ; inside a '[' .. ']' character-class
+        flags
+        (continue t)
+        (token (js2-new-token 0)))
+    (setq js2-ts-string-buffer nil)
+    (if (eq start-tt js2-ASSIGN_DIV)
+        ;; mis-scanned /=
+        (js2-add-to-string ?=)
+      (if (not (eq start-tt js2-DIV))
+          (error "failed assertion")))
+    (while (and (not err)
+                (or (/= (setq c (js2-get-char)) ?/)
+                    in-class))
+      (cond
+       ((or (= c ?\n)
+            (= c js2-EOF_CHAR))
+        (setf (js2-token-end token) (1- js2-ts-cursor)
+              err t
+              (js2-token-string token) (js2-collect-string js2-ts-string-buffer))
+        (js2-report-error "msg.unterminated.re.lit"))
+       (t (cond
+           ((= c ?\\)
+            (js2-add-to-string c)
+            (setq c (js2-get-char)))
+           ((= c ?\[)
+            (setq in-class t))
+           ((= c ?\])
+            (setq in-class nil)))
+          (js2-add-to-string c))))
+    (unless err
+      (while continue
+        (cond
+         ((js2-match-char ?g)
+          (push ?g flags))
+         ((js2-match-char ?i)
+          (push ?i flags))
+         ((js2-match-char ?m)
+          (push ?m flags))
+         ((and (js2-match-char ?u)
+               (>= js2-language-version 200))
+          (push ?u flags))
+         ((and (js2-match-char ?y)
+               (>= js2-language-version 200))
+          (push ?y flags))
+         (t
+          (setq continue nil))))
+      (if (js2-alpha-p (js2-peek-char))
+          (js2-report-scan-error "msg.invalid.re.flag" t
+                                 js2-ts-cursor 1))
+      (js2-set-string-from-buffer token))
+    (js2-collect-string flags)))
+
+(defun js2-get-first-xml-token ()
+  (setq js2-ts-xml-open-tags-count 0
+        js2-ts-is-xml-attribute nil
+        js2-ts-xml-is-tag-content nil)
+  (js2-unget-char)
+  (js2-get-next-xml-token))
+
+(defun js2-xml-discard-string (token)
+  "Throw away the string in progress and flag an XML parse error."
+  (setf js2-ts-string-buffer nil
+        (js2-token-string token) nil)
+  (js2-report-scan-error "msg.XML.bad.form" t))
+
+(defun js2-get-next-xml-token ()
+  (setq js2-ts-string-buffer nil)  ; for recording the XML
+  (let ((token (js2-new-token 0))
+        c result)
+    (setq result
+          (catch 'return
+            (while t
+              (setq c (js2-get-char))
+              (cond
+               ((= c js2-EOF_CHAR)
+                (throw 'return js2-ERROR))
+               (js2-ts-xml-is-tag-content
+                (cl-case c
+                  (?>
+                   (js2-add-to-string c)
+                   (setq js2-ts-xml-is-tag-content nil
+                         js2-ts-is-xml-attribute nil))
+                  (?/
+                   (js2-add-to-string c)
+                   (when (eq ?> (js2-peek-char))
+                     (setq c (js2-get-char))
+                     (js2-add-to-string c)
+                     (setq js2-ts-xml-is-tag-content nil)
+                     (cl-decf js2-ts-xml-open-tags-count)))
+                  (?{
+                   (js2-unget-char)
+                   (js2-set-string-from-buffer token)
+                   (throw 'return js2-XML))
+                  ((?\' ?\")
+                   (js2-add-to-string c)
+                   (unless (js2-read-quoted-string c token)
+                     (throw 'return js2-ERROR)))
+                  (?=
+                   (js2-add-to-string c)
+                   (setq js2-ts-is-xml-attribute t))
+                  ((? ?\t ?\r ?\n)
+                   (js2-add-to-string c))
+                  (t
+                   (js2-add-to-string c)
+                   (setq js2-ts-is-xml-attribute nil)))
+                (when (and (not js2-ts-xml-is-tag-content)
+                           (zerop js2-ts-xml-open-tags-count))
+                  (js2-set-string-from-buffer token)
+                  (throw 'return js2-XMLEND)))
+               (t
+                ;; else not tag content
+                (cl-case c
+                  (?<
+                   (js2-add-to-string c)
+                   (setq c (js2-peek-char))
+                   (cl-case c
+                     (?!
+                      (setq c (js2-get-char)) ;; skip !
+                      (js2-add-to-string c)
+                      (setq c (js2-peek-char))
+                      (cl-case c
+                        (?-
+                         (setq c (js2-get-char)) ;; skip -
+                         (js2-add-to-string c)
+                         (if (eq c ?-)
+                             (progn
+                               (js2-add-to-string c)
+                               (unless (js2-read-xml-comment token)
+                                 (throw 'return js2-ERROR)))
+                           (js2-xml-discard-string token)
+                           (throw 'return js2-ERROR)))
+                        (?\[
+                         (setq c (js2-get-char)) ;; skip [
+                         (js2-add-to-string c)
+                         (if (and (= (js2-get-char) ?C)
+                                  (= (js2-get-char) ?D)
+                                  (= (js2-get-char) ?A)
+                                  (= (js2-get-char) ?T)
+                                  (= (js2-get-char) ?A)
+                                  (= (js2-get-char) ?\[))
+                             (progn
+                               (js2-add-to-string ?C)
+                               (js2-add-to-string ?D)
+                               (js2-add-to-string ?A)
+                               (js2-add-to-string ?T)
+                               (js2-add-to-string ?A)
+                               (js2-add-to-string ?\[)
+                               (unless (js2-read-cdata token)
+                                 (throw 'return js2-ERROR)))
+                           (js2-xml-discard-string token)
+                           (throw 'return js2-ERROR)))
+                        (t
+                         (unless (js2-read-entity token)
+                           (throw 'return js2-ERROR))))
+                      ;; Allow bare CDATA section, e.g.:
+                      ;;   let xml = <![CDATA[ foo bar baz ]]>;
+                      (when (zerop js2-ts-xml-open-tags-count)
+                        (throw 'return js2-XMLEND)))
+                     (??
+                      (setq c (js2-get-char)) ;; skip ?
+                      (js2-add-to-string c)
+                      (unless (js2-read-PI token)
+                        (throw 'return js2-ERROR)))
+                     (?/
+                      ;; end tag
+                      (setq c (js2-get-char)) ;; skip /
+                      (js2-add-to-string c)
+                      (when (zerop js2-ts-xml-open-tags-count)
+                        (js2-xml-discard-string token)
+                        (throw 'return js2-ERROR))
+                      (setq js2-ts-xml-is-tag-content t)
+                      (cl-decf js2-ts-xml-open-tags-count))
+                     (t
+                      ;; start tag
+                      (setq js2-ts-xml-is-tag-content t)
+                      (cl-incf js2-ts-xml-open-tags-count))))
+                  (?{
+                   (js2-unget-char)
+                   (js2-set-string-from-buffer token)
+                   (throw 'return js2-XML))
+                  (t
+                   (js2-add-to-string c))))))))
+    (setf (js2-token-end token) js2-ts-cursor)
+    (setf (js2-token-type token) result)
+    result))
+
+(defun js2-read-quoted-string (quote token)
+  (let (c)
+    (catch 'return
+      (while (/= (setq c (js2-get-char)) js2-EOF_CHAR)
+        (js2-add-to-string c)
+        (if (eq c quote)
+            (throw 'return t)))
+      (js2-xml-discard-string token)  ;; throw away string in progress
+      nil)))
+
+(defun js2-read-xml-comment (token)
+  (let ((c (js2-get-char)))
+    (catch 'return
+      (while (/= c js2-EOF_CHAR)
+        (catch 'continue
+          (js2-add-to-string c)
+          (when (and (eq c ?-) (eq ?- (js2-peek-char)))
+            (setq c (js2-get-char))
+            (js2-add-to-string c)
+            (if (eq (js2-peek-char) ?>)
+                (progn
+                  (setq c (js2-get-char)) ;; skip >
+                  (js2-add-to-string c)
+                  (throw 'return t))
+              (throw 'continue nil)))
+          (setq c (js2-get-char))))
+      (js2-xml-discard-string token)
+      nil)))
+
+(defun js2-read-cdata (token)
+  (let ((c (js2-get-char)))
+    (catch 'return
+      (while (/= c js2-EOF_CHAR)
+        (catch 'continue
+          (js2-add-to-string c)
+          (when (and (eq c ?\]) (eq (js2-peek-char) ?\]))
+            (setq c (js2-get-char))
+            (js2-add-to-string c)
+            (if (eq (js2-peek-char) ?>)
+                (progn
+                  (setq c (js2-get-char)) ;; Skip >
+                  (js2-add-to-string c)
+                  (throw 'return t))
+              (throw 'continue nil)))
+          (setq c (js2-get-char))))
+      (js2-xml-discard-string token)
+      nil)))
+
+(defun js2-read-entity (token)
+  (let ((decl-tags 1)
+        c)
+    (catch 'return
+      (while (/= js2-EOF_CHAR (setq c (js2-get-char)))
+        (js2-add-to-string c)
+        (cl-case c
+          (?<
+           (cl-incf decl-tags))
+          (?>
+           (cl-decf decl-tags)
+           (if (zerop decl-tags)
+               (throw 'return t)))))
+      (js2-xml-discard-string token)
+      nil)))
+
+(defun js2-read-PI (token)
+  "Scan an XML processing instruction."
+  (let (c)
+    (catch 'return
+      (while (/= js2-EOF_CHAR (setq c (js2-get-char)))
+        (js2-add-to-string c)
+        (when (and (eq c ??) (eq (js2-peek-char) ?>))
+          (setq c (js2-get-char))  ;; Skip >
+          (js2-add-to-string c)
+          (throw 'return t)))
+      (js2-xml-discard-string token)
+      nil)))
+
+;;; Highlighting
+
+(defun js2-set-face (beg end face &optional record)
+  "Fontify a region.  If RECORD is non-nil, record for later."
+  (when (cl-plusp js2-highlight-level)
+    (setq beg (min (point-max) beg)
+          beg (max (point-min) beg)
+          end (min (point-max) end)
+          end (max (point-min) end))
+    (if record
+        (push (list beg end face) js2-mode-fontifications)
+      (put-text-property beg end 'font-lock-face face))))
+
+(defsubst js2-clear-face (beg end)
+  (remove-text-properties beg end '(font-lock-face nil
+                                    help-echo nil
+                                    point-entered nil
+                                    c-in-sws nil)))
+
+(defconst js2-ecma-global-props
+  (concat "^"
+          (regexp-opt
+           '("Infinity" "NaN" "undefined" "arguments") t)
+          "$")
+  "Value properties of the Ecma-262 Global Object.
+Shown at or above `js2-highlight-level' 2.")
+
+;; might want to add the name "arguments" to this list?
+(defconst js2-ecma-object-props
+  (concat "^"
+          (regexp-opt
+           '("prototype" "__proto__" "__parent__") t)
+          "$")
+  "Value properties of the Ecma-262 Object constructor.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-global-funcs
+  (concat
+   "^"
+   (regexp-opt
+    '("decodeURI" "decodeURIComponent" "encodeURI" "encodeURIComponent"
+      "eval" "isFinite" "isNaN" "parseFloat" "parseInt") t)
+   "$")
+  "Function properties of the Ecma-262 Global object.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-number-props
+  (concat "^"
+          (regexp-opt '("MAX_VALUE" "MIN_VALUE" "NaN"
+                        "NEGATIVE_INFINITY"
+                        "POSITIVE_INFINITY") t)
+          "$")
+  "Properties of the Ecma-262 Number constructor.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-date-props "^\\(parse\\|UTC\\)$"
+  "Properties of the Ecma-262 Date constructor.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-math-props
+  (concat "^"
+          (regexp-opt
+           '("E" "LN10" "LN2" "LOG2E" "LOG10E" "PI" "SQRT1_2" "SQRT2")
+           t)
+          "$")
+  "Properties of the Ecma-262 Math object.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-math-funcs
+  (concat "^"
+          (regexp-opt
+           '("abs" "acos" "asin" "atan" "atan2" "ceil" "cos" "exp" "floor"
+             "log" "max" "min" "pow" "random" "round" "sin" "sqrt" "tan") t)
+          "$")
+  "Function properties of the Ecma-262 Math object.
+Shown at or above `js2-highlight-level' 2.")
+
+(defconst js2-ecma-function-props
+  (concat
+   "^"
+   (regexp-opt
+    '(;; properties of the Object prototype object
+      "hasOwnProperty" "isPrototypeOf" "propertyIsEnumerable"
+      "toLocaleString" "toString" "valueOf"
+      ;; properties of the Function prototype object
+      "apply" "call"
+      ;; properties of the Array prototype object
+      "concat" "join" "pop" "push" "reverse" "shift" "slice" "sort"
+      "splice" "unshift"
+      ;; properties of the String prototype object
+      "charAt" "charCodeAt" "fromCharCode" "indexOf" "lastIndexOf"
+      "localeCompare" "match" "replace" "search" "split" "substring"
+      "toLocaleLowerCase" "toLocaleUpperCase" "toLowerCase"
+      "toUpperCase"
+      ;; properties of the Number prototype object
+      "toExponential" "toFixed" "toPrecision"
+      ;; properties of the Date prototype object
+      "getDate" "getDay" "getFullYear" "getHours" "getMilliseconds"
+      "getMinutes" "getMonth" "getSeconds" "getTime"
+      "getTimezoneOffset" "getUTCDate" "getUTCDay" "getUTCFullYear"
+      "getUTCHours" "getUTCMilliseconds" "getUTCMinutes" "getUTCMonth"
+      "getUTCSeconds" "setDate" "setFullYear" "setHours"
+      "setMilliseconds" "setMinutes" "setMonth" "setSeconds" "setTime"
+      "setUTCDate" "setUTCFullYear" "setUTCHours" "setUTCMilliseconds"
+      "setUTCMinutes" "setUTCMonth" "setUTCSeconds" "toDateString"
+      "toLocaleDateString" "toLocaleString" "toLocaleTimeString"
+      "toTimeString" "toUTCString"
+      ;; properties of the RegExp prototype object
+      "exec" "test"
+      ;; properties of the JSON prototype object
+      "parse" "stringify"
+      ;; SpiderMonkey/Rhino extensions, versions 1.5+
+      "toSource" "__defineGetter__" "__defineSetter__"
+      "__lookupGetter__" "__lookupSetter__" "__noSuchMethod__"
+      "every" "filter" "forEach" "lastIndexOf" "map" "some")
+    t)
+   "$")
+  "Built-in functions defined by Ecma-262 and SpiderMonkey extensions.
+Shown at or above `js2-highlight-level' 3.")
+
+(defun js2-parse-highlight-prop-get (parent target prop call-p)
+  (let ((target-name (and target
+                          (js2-name-node-p target)
+                          (js2-name-node-name target)))
+        (prop-name (if prop (js2-name-node-name prop)))
+        (level2 (>= js2-highlight-level 2))
+        (level3 (>= js2-highlight-level 3)))
+    (when level2
+      (let ((face
+             (if call-p
+                 (cond
+                  ((and target prop)
+                   (cond
+                    ((and level3 (string-match js2-ecma-function-props prop-name))
+                     'font-lock-builtin-face)
+                    ((and target-name prop)
+                     (cond
+                      ((string= target-name "Date")
+                       (if (string-match js2-ecma-date-props prop-name)
+                           'font-lock-builtin-face))
+                      ((string= target-name "Math")
+                       (if (string-match js2-ecma-math-funcs prop-name)
+                           'font-lock-builtin-face))))))
+                  (prop
+                   (if (string-match js2-ecma-global-funcs prop-name)
+                       'font-lock-builtin-face)))
+               (cond
+                ((and target prop)
+                 (cond
+                  ((string= target-name "Number")
+                   (if (string-match js2-ecma-number-props prop-name)
+                       'font-lock-constant-face))
+                  ((string= target-name "Math")
+                   (if (string-match js2-ecma-math-props prop-name)
+                       'font-lock-constant-face))))
+                (prop
+                 (if (string-match js2-ecma-object-props prop-name)
+                     'font-lock-constant-face))))))
+        (when face
+          (let ((pos (+ (js2-node-pos parent)  ; absolute
+                        (js2-node-pos prop)))) ; relative
+            (js2-set-face pos
+                          (+ pos (js2-node-len prop))
+                          face 'record)))))))
+
+(defun js2-parse-highlight-member-expr-node (node)
+  "Perform syntax highlighting of EcmaScript built-in properties.
+The variable `js2-highlight-level' governs this highighting."
+  (let (face target prop name pos end parent call-p callee)
+    (cond
+     ;; case 1:  simple name, e.g. foo
+     ((js2-name-node-p node)
+      (setq name (js2-name-node-name node))
+      ;; possible for name to be nil in rare cases - saw it when
+      ;; running js2-mode on an elisp buffer.  Might as well try to
+      ;; make it so js2-mode never barfs.
+      (when name
+        (setq face (if (string-match js2-ecma-global-props name)
+                       'font-lock-constant-face))
+        (when face
+          (setq pos (js2-node-pos node)
+                end (+ pos (js2-node-len node)))
+          (js2-set-face pos end face 'record))))
+     ;; case 2:  property access or function call
+     ((or (js2-prop-get-node-p node)
+          ;; highlight function call if expr is a prop-get node
+          ;; or a plain name (i.e. unqualified function call)
+          (and (setq call-p (js2-call-node-p node))
+               (setq callee (js2-call-node-target node)) ; separate setq!
+               (or (js2-prop-get-node-p callee)
+                   (js2-name-node-p callee))))
+      (setq parent node
+            node (if call-p callee node))
+      (if (and call-p (js2-name-node-p callee))
+          (setq prop callee)
+        (setq target (js2-prop-get-node-left node)
+              prop (js2-prop-get-node-right node)))
+      (cond
+       ((js2-name-node-p prop)
+        ;; case 2(a&c):  simple or complex target, simple name, e.g. x[y].bar
+        (js2-parse-highlight-prop-get parent target prop call-p))
+       ((js2-name-node-p target)
+        ;; case 2b:  simple target, complex name, e.g. foo.x[y]
+        (js2-parse-highlight-prop-get parent target nil call-p)))))))
+
+(defun js2-parse-highlight-member-expr-fn-name (expr)
+  "Highlight the `baz' in function foo.bar.baz(args) {...}.
+This is experimental Rhino syntax.  EXPR is the foo.bar.baz member expr.
+We currently only handle the case where the last component is a prop-get
+of a simple name.  Called before EXPR has a parent node."
+  (let (pos
+        (name (and (js2-prop-get-node-p expr)
+                   (js2-prop-get-node-right expr))))
+    (when (js2-name-node-p name)
+      (js2-set-face (setq pos (+ (js2-node-pos expr)  ; parent is absolute
+                                 (js2-node-pos name)))
+                    (+ pos (js2-node-len name))
+                    'font-lock-function-name-face
+                    'record))))
+
+;; source:  http://jsdoc.sourceforge.net/
+;; Note - this syntax is for Google's enhanced jsdoc parser that
+;; allows type specifications, and needs work before entering the wild.
+
+(defconst js2-jsdoc-param-tag-regexp
+  (concat "^\\s-*\\*+\\s-*\\(@"
+          "\\(?:param\\|argument\\)"
+          "\\)"
+          "\\s-*\\({[^}]+}\\)?"         ; optional type
+          "\\s-*\\[?\\([[:alnum:]_$\.]+\\)?\\]?"  ; name
+          "\\>")
+  "Matches jsdoc tags with optional type and optional param name.")
+
+(defconst js2-jsdoc-typed-tag-regexp
+  (concat "^\\s-*\\*+\\s-*\\(@\\(?:"
+          (regexp-opt
+           '("enum"
+             "extends"
+             "field"
+             "id"
+             "implements"
+             "lends"
+             "mods"
+             "requires"
+             "return"
+             "returns"
+             "throw"
+             "throws"))
+          "\\)\\)\\s-*\\({[^}]+}\\)?")
+  "Matches jsdoc tags with optional type.")
+
+(defconst js2-jsdoc-arg-tag-regexp
+  (concat "^\\s-*\\*+\\s-*\\(@\\(?:"
+          (regexp-opt
+           '("alias"
+             "augments"
+             "borrows"
+             "bug"
+             "base"
+             "config"
+             "default"
+             "define"
+             "exception"
+             "function"
+             "member"
+             "memberOf"
+             "name"
+             "namespace"
+             "property"
+             "since"
+             "suppress"
+             "this"
+             "throws"
+             "type"
+             "version"))
+          "\\)\\)\\s-+\\([^ \t]+\\)")
+  "Matches jsdoc tags with a single argument.")
+
+(defconst js2-jsdoc-empty-tag-regexp
+  (concat "^\\s-*\\*+\\s-*\\(@\\(?:"
+          (regexp-opt
+           '("addon"
+             "author"
+             "class"
+             "const"
+             "constant"
+             "constructor"
+             "constructs"
+             "deprecated"
+             "desc"
+             "description"
+             "event"
+             "example"
+             "exec"
+             "export"
+             "fileoverview"
+             "final"
+             "function"
+             "hidden"
+             "ignore"
+             "implicitCast"
+             "inheritDoc"
+             "inner"
+             "interface"
+             "license"
+             "noalias"
+             "noshadow"
+             "notypecheck"
+             "override"
+             "owner"
+             "preserve"
+             "preserveTry"
+             "private"
+             "protected"
+             "public"
+             "static"
+             "supported"
+             ))
+          "\\)\\)\\s-*")
+  "Matches empty jsdoc tags.")
+
+(defconst js2-jsdoc-link-tag-regexp
+  "{\\(@\\(?:link\\|code\\)\\)\\s-+\\([^#}\n]+\\)\\(#.+\\)?}"
+  "Matches a jsdoc link or code tag.")
+
+(defconst js2-jsdoc-see-tag-regexp
+  "^\\s-*\\*+\\s-*\\(@see\\)\\s-+\\([^#}\n]+\\)\\(#.+\\)?"
+  "Matches a jsdoc @see tag.")
+
+(defconst js2-jsdoc-html-tag-regexp
+  "\\(</?\\)\\([[:alpha:]]+\\)\\s-*\\(/?>\\)"
+  "Matches a simple (no attributes) html start- or end-tag.")
+
+(defun js2-jsdoc-highlight-helper ()
+  (js2-set-face (match-beginning 1)
+                (match-end 1)
+                'js2-jsdoc-tag)
+  (if (match-beginning 2)
+      (if (save-excursion
+            (goto-char (match-beginning 2))
+            (= (char-after) ?{))
+          (js2-set-face (1+ (match-beginning 2))
+                        (1- (match-end 2))
+                        'js2-jsdoc-type)
+        (js2-set-face (match-beginning 2)
+                      (match-end 2)
+                      'js2-jsdoc-value)))
+  (if (match-beginning 3)
+      (js2-set-face (match-beginning 3)
+                    (match-end 3)
+                    'js2-jsdoc-value)))
+
+(defun js2-highlight-jsdoc (ast)
+  "Highlight doc comment tags."
+  (let ((comments (js2-ast-root-comments ast))
+        beg end)
+    (save-excursion
+      (dolist (node comments)
+        (when (eq (js2-comment-node-format node) 'jsdoc)
+          (setq beg (js2-node-abs-pos node)
+                end (+ beg (js2-node-len node)))
+          (save-restriction
+            (narrow-to-region beg end)
+            (dolist (re (list js2-jsdoc-param-tag-regexp
+                              js2-jsdoc-typed-tag-regexp
+                              js2-jsdoc-arg-tag-regexp
+                              js2-jsdoc-link-tag-regexp
+                              js2-jsdoc-see-tag-regexp
+                              js2-jsdoc-empty-tag-regexp))
+              (goto-char beg)
+              (while (re-search-forward re nil t)
+                (js2-jsdoc-highlight-helper)))
+            ;; simple highlighting for html tags
+            (goto-char beg)
+            (while (re-search-forward js2-jsdoc-html-tag-regexp nil t)
+              (js2-set-face (match-beginning 1)
+                            (match-end 1)
+                            'js2-jsdoc-html-tag-delimiter)
+              (js2-set-face (match-beginning 2)
+                            (match-end 2)
+                            'js2-jsdoc-html-tag-name)
+              (js2-set-face (match-beginning 3)
+                            (match-end 3)
+                            'js2-jsdoc-html-tag-delimiter))))))))
+
+(defun js2-highlight-assign-targets (_node left right)
+  "Highlight function properties and external variables."
+  (let (leftpos name)
+    ;; highlight vars and props assigned function values
+    (when (or (js2-function-node-p right)
+              (js2-class-node-p right))
+      (cond
+       ;; var foo = function() {...}
+       ((js2-name-node-p left)
+        (setq name left))
+       ;; foo.bar.baz = function() {...}
+       ((and (js2-prop-get-node-p left)
+             (js2-name-node-p (js2-prop-get-node-right left)))
+        (setq name (js2-prop-get-node-right left))))
+      (when name
+        (js2-set-face (setq leftpos (js2-node-abs-pos name))
+                      (+ leftpos (js2-node-len name))
+                      'font-lock-function-name-face
+                      'record)))))
+
+(defun js2-record-name-node (node)
+  "Saves NODE to `js2-recorded-identifiers' to check for undeclared variables
+later. NODE must be a name node."
+  (let ((leftpos (js2-node-abs-pos node)))
+    (push (list node js2-current-scope
+                leftpos
+                (+ leftpos (js2-node-len node)))
+          js2-recorded-identifiers)))
+
+(defun js2-highlight-undeclared-vars ()
+  "After entire parse is finished, look for undeclared variable references.
+We have to wait until entire buffer is parsed, since JavaScript permits var
+decls to occur after they're used.
+
+If any undeclared var name is in `js2-externs' or `js2-additional-externs',
+it is considered declared."
+  (let (name)
+    (dolist (entry js2-recorded-identifiers)
+      (cl-destructuring-bind (name-node scope pos end) entry
+        (setq name (js2-name-node-name name-node))
+        (unless (or (member name js2-global-externs)
+                    (member name js2-default-externs)
+                    (member name js2-additional-externs)
+                    (js2-get-defining-scope scope name))
+          (js2-report-warning "msg.undeclared.variable" name pos (- end pos)
+                              'js2-external-variable))))
+    (setq js2-recorded-identifiers nil)))
+
+(defun js2-set-default-externs ()
+  "Set the value of `js2-default-externs' based on the various
+`js2-include-?-externs' variables."
+  (setq js2-default-externs
+        (append js2-ecma-262-externs
+                (if js2-include-browser-externs js2-browser-externs)
+                (if (and js2-include-browser-externs
+                         (>= js2-language-version 200)) js2-harmony-externs)
+                (if js2-include-rhino-externs js2-rhino-externs)
+                (if js2-include-node-externs js2-node-externs)
+                (if (or js2-include-browser-externs js2-include-node-externs)
+                    js2-typed-array-externs))))
+
+(defun js2-apply-jslint-globals ()
+  (setq js2-additional-externs
+        (nconc (js2-get-jslint-globals)
+               js2-additional-externs)))
+
+(defun js2-get-jslint-globals ()
+  (cl-loop for node in (js2-ast-root-comments js2-mode-ast)
+           when (and (eq 'block (js2-comment-node-format node))
+                     (save-excursion
+                       (goto-char (js2-node-abs-pos node))
+                       (looking-at "/\\*global ")))
+           append (js2-get-jslint-globals-in
+                   (match-end 0)
+                   (js2-node-abs-end node))))
+
+(defun js2-get-jslint-globals-in (beg end)
+  (let (res)
+    (save-excursion
+      (goto-char beg)
+      (while (re-search-forward js2-mode-identifier-re end t)
+        (let ((match (match-string 0)))
+          (unless (member match '("true" "false"))
+            (push match res)))))
+    (nreverse res)))
+
+;;; IMenu support
+
+;; We currently only support imenu, but eventually should support speedbar and
+;; possibly other browsing mechanisms.
+
+;; The basic strategy is to identify function assignment targets of the form
+;; `foo.bar.baz', convert them to (list fn foo bar baz <position>), and push the
+;; list into `js2-imenu-recorder'.  The lists are merged into a trie-like tree
+;; for imenu after parsing is finished.
+
+;; A `foo.bar.baz' assignment target may be expressed in many ways in
+;; JavaScript, and the general problem is undecidable.  However, several forms
+;; are readily recognizable at parse-time; the forms we attempt to recognize
+;; include:
+
+;;  function foo()  -- function declaration
+;;  foo = function()  -- function expression assigned to variable
+;;  foo.bar.baz = function()  -- function expr assigned to nested property-get
+;;  foo = {bar: function()}  -- fun prop in object literal assigned to var
+;;  foo = {bar: {baz: function()}} -- inside nested object literal
+;;  foo.bar = {baz: function()}} -- obj lit assigned to nested prop get
+;;  a.b = {c: {d: function()}} -- nested obj lit assigned to nested prop get
+;;  foo = {get bar() {...}}  -- getter/setter in obj literal
+;;  function foo() {function bar() {...}}  -- nested function
+;;  foo['a'] = function()  -- fun expr assigned to deterministic element-get
+
+;; This list boils down to a few forms that can be combined recursively.
+;; Top-level named function declarations include both the left-hand (name)
+;; and the right-hand (function value) expressions needed to produce an imenu
+;; entry.  The other "right-hand" forms we need to look for are:
+;;  - functions declared as props/getters/setters in object literals
+;;  - nested named function declarations
+;; The "left-hand" expressions that functions can be assigned to include:
+;;  - local/global variables
+;;  - nested property-get expressions like a.b.c.d
+;;  - element gets like foo[10] or foo['bar'] where the index
+;;    expression can be trivially converted to a property name.  They
+;;    effectively then become property gets.
+
+;; All the different definition types are canonicalized into the form
+;; foo.bar.baz = position-of-function-keyword
+
+;; We need to build a trie-like structure for imenu.  As an example,
+;; consider the following JavaScript code:
+
+;; a = function() {...}  // function at position 5
+;; b = function() {...}  // function at position 25
+;; foo = function() {...} // function at position 100
+;; foo.bar = function() {...} // function at position 200
+;; foo.bar.baz = function() {...} // function at position 300
+;; foo.bar.zab = function() {...} // function at position 400
+
+;; During parsing we accumulate an entry for each definition in
+;; the variable `js2-imenu-recorder', like so:
+
+;; '((fn a 5)
+;;   (fn b 25)
+;;   (fn foo 100)
+;;   (fn foo bar 200)
+;;   (fn foo bar baz 300)
+;;   (fn foo bar zab 400))
+
+;; Where 'fn' is the respective function node.
+;; After parsing these entries are merged into this alist-trie:
+
+;; '((a . 1)
+;;   (b . 2)
+;;   (foo (<definition> . 3)
+;;        (bar (<definition> . 6)
+;;             (baz . 100)
+;;             (zab . 200))))
+
+;; Note the wacky need for a <definition> name.  The token can be anything
+;; that isn't a valid JavaScript identifier, because you might make foo
+;; a function and then start setting properties on it that are also functions.
+
+(defun js2-prop-node-name (node)
+  "Return the name of a node that may be a property-get/property-name.
+If NODE is not a valid name-node, string-node or integral number-node,
+returns nil.  Otherwise returns the string name/value of the node."
+  (cond
+   ((js2-name-node-p node)
+    (js2-name-node-name node))
+   ((js2-string-node-p node)
+    (js2-string-node-value node))
+   ((and (js2-number-node-p node)
+         (string-match "^[0-9]+$" (js2-number-node-value node)))
+    (js2-number-node-value node))
+   ((eq (js2-node-type node) js2-THIS)
+    "this")
+   ((eq (js2-node-type node) js2-SUPER)
+    "super")))
+
+(defun js2-node-qname-component (node)
+  "Return the name of this node, if it contributes to a qname.
+Returns nil if the node doesn't contribute."
+  (copy-sequence
+   (or (js2-prop-node-name node)
+       (if (and (js2-function-node-p node)
+                (js2-function-node-name node))
+           (js2-name-node-name (js2-function-node-name node))))))
+
+(defun js2-record-imenu-entry (fn-node qname pos)
+  "Add an entry to `js2-imenu-recorder'.
+FN-NODE should be the current item's function node.
+
+Associate FN-NODE with its QNAME for later lookup.
+This is used in postprocessing the chain list.  For each chain, we find
+the parent function, look up its qname, then prepend a copy of it to the chain."
+  (push (cons fn-node (append qname (list pos))) js2-imenu-recorder)
+  (unless js2-imenu-function-map
+    (setq js2-imenu-function-map (make-hash-table :test 'eq)))
+  (puthash fn-node qname js2-imenu-function-map))
+
+(defun js2-record-imenu-functions (node &optional var)
+  "Record function definitions for imenu.
+NODE is a function node or an object literal.
+VAR, if non-nil, is the expression that NODE is being assigned to.
+When passed arguments of wrong type, does nothing."
+  (when js2-parse-ide-mode
+    (let ((fun-p (js2-function-node-p node))
+          qname fname-node)
+      (cond
+       ;; non-anonymous function declaration?
+       ((and fun-p
+             (not var)
+             (setq fname-node (js2-function-node-name node)))
+        (js2-record-imenu-entry node (list fname-node) (js2-node-pos node)))
+       ;; for remaining forms, compute left-side tree branch first
+       ((and var (setq qname (js2-compute-nested-prop-get var)))
+        (cond
+         ;; foo.bar.baz = function
+         (fun-p
+          (js2-record-imenu-entry node qname (js2-node-pos node)))
+         ;; foo.bar.baz = object-literal
+         ;; look for nested functions:  {a: {b: function() {...} }}
+         ((js2-object-node-p node)
+          ;; Node position here is still absolute, since the parser
+          ;; passes the assignment target and value expressions
+          ;; to us before they are added as children of the assignment node.
+          (js2-record-object-literal node qname (js2-node-pos node)))))))))
+
+(defun js2-compute-nested-prop-get (node)
+  "If NODE is of form foo.bar, foo['bar'], or any nested combination, return
+component nodes as a list.  Otherwise return nil.  Element-gets are treated
+as property-gets if the index expression is a string, or a positive integer."
+  (let (left right head)
+    (cond
+     ((or (js2-name-node-p node)
+          (js2-this-or-super-node-p node))
+      (list node))
+     ;; foo.bar.baz is parenthesized as (foo.bar).baz => right operand is a leaf
+     ((js2-prop-get-node-p node)        ; foo.bar
+      (setq left (js2-prop-get-node-left node)
+            right (js2-prop-get-node-right node))
+      (if (setq head (js2-compute-nested-prop-get left))
+          (nconc head (list right))))
+     ((js2-elem-get-node-p node)        ; foo['bar'] or foo[101]
+      (setq left (js2-elem-get-node-target node)
+            right (js2-elem-get-node-element node))
+      (if (or (js2-string-node-p right)      ; ['bar']
+              (and (js2-number-node-p right) ; [10]
+                   (string-match "^[0-9]+$"
+                                 (js2-number-node-value right))))
+          (if (setq head (js2-compute-nested-prop-get left))
+              (nconc head (list right))))))))
+
+(defun js2-record-object-literal (node qname pos)
+  "Recursively process an object literal looking for functions.
+NODE is an object literal that is the right-hand child of an assignment
+expression.  QNAME is a list of nodes representing the assignment target,
+e.g. for foo.bar.baz = {...}, QNAME is (foo-node bar-node baz-node).
+POS is the absolute position of the node.
+We do a depth-first traversal of NODE.  For any functions we find,
+we append the property name to QNAME, then call `js2-record-imenu-entry'."
+  (let (right)
+    (dolist (e (js2-object-node-elems node))  ; e is a `js2-object-prop-node'
+      (let ((left (js2-infix-node-left e))
+            ;; Element positions are relative to the parent position.
+            (pos (+ pos (js2-node-pos e))))
+        (cond
+         ;; foo: function() {...}
+         ((js2-function-node-p (setq right (js2-infix-node-right e)))
+          (when (js2-prop-node-name left)
+            ;; As a policy decision, we record the position of the property,
+            ;; not the position of the `function' keyword, since the property
+            ;; is effectively the name of the function.
+            (js2-record-imenu-entry right (append qname (list left)) pos)))
+         ;; foo: {object-literal} -- add foo to qname, offset position, and recurse
+         ((js2-object-node-p right)
+          (js2-record-object-literal right
+                                     (append qname (list (js2-infix-node-left e)))
+                                     (+ pos (js2-node-pos right)))))))))
+
+(defun js2-node-top-level-decl-p (node)
+  "Return t if NODE's name is defined in the top-level scope.
+Also returns t if NODE's name is not defined in any scope, since it implies
+that it's an external variable, which must also be in the top-level scope."
+  (let* ((name (js2-prop-node-name node))
+         (this-scope (js2-node-get-enclosing-scope node))
+         defining-scope)
+    (cond
+     ((js2-this-or-super-node-p node)
+      nil)
+     ((null this-scope)
+      t)
+     ((setq defining-scope (js2-get-defining-scope this-scope name))
+      (js2-ast-root-p defining-scope))
+     (t t))))
+
+(defun js2-wrapper-function-p (node)
+  "Return t if NODE is a function expression that's immediately invoked.
+NODE must be `js2-function-node'."
+  (let ((parent (js2-node-parent node)))
+    (or
+     ;; function(){...}();
+     (and (js2-call-node-p parent)
+          (eq node (js2-call-node-target parent)))
+     (and (js2-paren-node-p parent)
+          ;; (function(){...})();
+          (or (js2-call-node-p (setq parent (js2-node-parent parent)))
+              ;; (function(){...}).call(this);
+              (and (js2-prop-get-node-p parent)
+                   (member (js2-name-node-name (js2-prop-get-node-right parent))
+                           '("call" "apply"))
+                   (js2-call-node-p (js2-node-parent parent))))))))
+
+(defun js2-browse-postprocess-chains ()
+  "Modify function-declaration name chains after parsing finishes.
+Some of the information is only available after the parse tree is complete.
+For instance, processing a nested scope requires a parent function node."
+  (let (result fn parent-qname p elem)
+    (dolist (entry js2-imenu-recorder)
+      ;; function node goes first
+      (cl-destructuring-bind (current-fn &rest (&whole chain head &rest)) entry
+        ;; Examine head's defining scope:
+        ;; Pre-processed chain, or top-level/external, keep as-is.
+        (if (or (stringp head) (js2-node-top-level-decl-p head))
+            (push chain result)
+          (when (js2-this-or-super-node-p head)
+            (setq chain (cdr chain))) ; discard this-node
+          (when (setq fn (js2-node-parent-script-or-fn current-fn))
+            (setq parent-qname (gethash fn js2-imenu-function-map 'not-found))
+            (when (eq parent-qname 'not-found)
+              ;; anonymous function expressions are not recorded
+              ;; during the parse, so we need to handle this case here
+              (setq parent-qname
+                    (if (js2-wrapper-function-p fn)
+                        (let ((grandparent (js2-node-parent-script-or-fn fn)))
+                          (if (js2-ast-root-p grandparent)
+                              nil
+                            (gethash grandparent js2-imenu-function-map 'skip)))
+                      'skip))
+              (puthash fn parent-qname js2-imenu-function-map))
+            (if (eq parent-qname 'skip)
+                ;; We don't show it, let's record that fact.
+                (remhash current-fn js2-imenu-function-map)
+              ;; Prepend parent fn qname to this chain.
+              (let ((qname (append parent-qname chain)))
+                (puthash current-fn (butlast qname) js2-imenu-function-map)
+                (push qname result)))))))
+    ;; Collect chains obtained by third-party code.
+    (let (js2-imenu-recorder)
+      (run-hooks 'js2-build-imenu-callbacks)
+      (dolist (entry js2-imenu-recorder)
+        (push (cdr entry) result)))
+    ;; Finally replace each node in each chain with its name.
+    (dolist (chain result)
+      (setq p chain)
+      (while p
+        (if (js2-node-p (setq elem (car p)))
+            (setcar p (js2-node-qname-component elem)))
+        (setq p (cdr p))))
+    result))
+
+;; Merge name chains into a trie-like tree structure of nested lists.
+;; To simplify construction of the trie, we first build it out using the rule
+;; that the trie consists of lists of pairs.  Each pair is a 2-element array:
+;; [key, num-or-list].  The second element can be a number; if so, this key
+;; is a leaf-node with only one value.  (I.e. there is only one declaration
+;; associated with the key at this level.)  Otherwise the second element is
+;; a list of pairs, with the rule applied recursively.  This symmetry permits
+;; a simple recursive formulation.
+;;
+;; js2-mode is building the data structure for imenu.  The imenu documentation
+;; claims that it's the structure above, but in practice it wants the children
+;; at the same list level as the key for that level, which is how I've drawn
+;; the "Expected final result" above.  We'll postprocess the trie to remove the
+;; list wrapper around the children at each level.
+;;
+;; A completed nested imenu-alist entry looks like this:
+;;       '(("foo"
+;;          ("<definition>" . 7)
+;;          ("bar"
+;;           ("a" . 40)
+;;           ("b" . 60))))
+;;
+;; In particular, the documentation for `imenu--index-alist' says that
+;; a nested sub-alist element looks like (INDEX-NAME SUB-ALIST).
+;; The sub-alist entries immediately follow INDEX-NAME, the head of the list.
+
+(defun js2-treeify (lst)
+  "Convert (a b c d) to (a ((b ((c d)))))."
+  (if (null (cddr lst))  ; list length <= 2
+      lst
+    (list (car lst) (list (js2-treeify (cdr lst))))))
+
+(defun js2-build-alist-trie (chains trie)
+  "Merge declaration name chains into a trie-like alist structure for imenu.
+CHAINS is the qname chain list produced during parsing. TRIE is a
+list of elements built up so far."
+  (let (head tail pos branch kids)
+    (dolist (chain chains)
+      (setq head (car chain)
+            tail (cdr chain)
+            pos (if (numberp (car tail)) (car tail))
+            branch (js2-find-if (lambda (n)
+                                  (string= (car n) head))
+                                trie)
+            kids (cl-second branch))
+      (cond
+       ;; case 1:  this key isn't in the trie yet
+       ((null branch)
+        (if trie
+            (setcdr (last trie) (list (js2-treeify chain)))
+          (setq trie (list (js2-treeify chain)))))
+       ;; case 2:  key is present with a single number entry:  replace w/ list
+       ;;  ("a1" 10)  +  ("a1" 20) => ("a1" (("<definition>" 10)
+       ;;                                    ("<definition>" 20)))
+       ((numberp kids)
+        (setcar (cdr branch)
+                (list (list "<definition-1>" kids)
+                      (if pos
+                          (list "<definition-2>" pos)
+                        (js2-treeify tail)))))
+       ;; case 3:  key is there (with kids), and we're a number entry
+       (pos
+        (setcdr (last kids)
+                (list
+                 (list (format "<definition-%d>"
+                               (1+ (cl-loop for kid in kids
+                                            count (eq ?< (aref (car kid) 0)))))
+                       pos))))
+       ;; case 4:  key is there with kids, need to merge in our chain
+       (t
+        (js2-build-alist-trie (list tail) kids))))
+    trie))
+
+(defun js2-flatten-trie (trie)
+  "Convert TRIE to imenu-format.
+Recurses through nodes, and for each one whose second element is a list,
+appends the list's flattened elements to the current element.  Also
+changes the tails into conses.  For instance, this pre-flattened trie
+
+'(a ((b 20)
+     (c ((d 30)
+         (e 40)))))
+
+becomes
+
+'(a (b . 20)
+    (c (d . 30)
+       (e . 40)))
+
+Note that the root of the trie has no key, just a list of chains.
+This is also true for the value of any key with multiple children,
+e.g. key 'c' in the example above."
+  (cond
+   ((listp (car trie))
+    (mapcar #'js2-flatten-trie trie))
+   (t
+    (if (numberp (cl-second trie))
+        (cons (car trie) (cl-second trie))
+      ;; else pop list and append its kids
+      (apply #'append (list (car trie)) (js2-flatten-trie (cdr trie)))))))
+
+(defun js2-build-imenu-index ()
+  "Turn `js2-imenu-recorder' into an imenu data structure."
+  (when (eq js2-imenu-recorder 'empty)
+    (setq js2-imenu-recorder nil))
+  (let* ((chains (js2-browse-postprocess-chains))
+         (result (js2-build-alist-trie chains nil)))
+    (js2-flatten-trie result)))
+
+(defun js2-test-print-chains (chains)
+  "Print a list of qname chains.
+Each element of CHAINS is a list of the form (NODE [NODE *] pos);
+i.e. one or more nodes, and an integer position as the list tail."
+  (mapconcat (lambda (chain)
+               (concat "("
+                       (mapconcat (lambda (elem)
+                                    (if (js2-node-p elem)
+                                        (or (js2-node-qname-component elem)
+                                            "nil")
+                                      (number-to-string elem)))
+                                  chain
+                                  " ")
+                       ")"))
+             chains
+             "\n"))
+
+;;; Parser
+
+(defconst js2-version "1.8.5"
+  "Version of JavaScript supported.")
+
+(defun js2-record-face (face &optional token)
+  "Record a style run of FACE for TOKEN or the current token."
+  (unless token (setq token (js2-current-token)))
+  (js2-set-face (js2-token-beg token) (js2-token-end token) face 'record))
+
+(defsubst js2-node-end (n)
+  "Computes the absolute end of node N.
+Use with caution!  Assumes `js2-node-pos' is -absolute-, which
+is only true until the node is added to its parent; i.e., while parsing."
+  (+ (js2-node-pos n)
+     (js2-node-len n)))
+
+(defun js2-record-comment (token)
+  "Record a comment in `js2-scanned-comments'."
+  (let ((ct (js2-token-comment-type token))
+        (beg (js2-token-beg token))
+        (end (js2-token-end token)))
+    (push (make-js2-comment-node :len (- end beg)
+                                 :format ct)
+          js2-scanned-comments)
+    (when js2-parse-ide-mode
+      (js2-record-face (if (eq ct 'jsdoc)
+                           'font-lock-doc-face
+                         'font-lock-comment-face)
+                       token)
+      (when (memq ct '(html preprocessor))
+        ;; Tell cc-engine the bounds of the comment.
+        (js2-record-text-property beg (1- end) 'c-in-sws t)))))
+
+(defun js2-peek-token ()
+  "Return the next token type without consuming it.
+If `js2-ti-lookahead' is positive, return the type of next token
+from `js2-ti-tokens'.  Otherwise, call `js2-get-token'."
+  (if (not (zerop js2-ti-lookahead))
+      (js2-token-type
+       (aref js2-ti-tokens (mod (1+ js2-ti-tokens-cursor) js2-ti-ntokens)))
+    (let ((tt (js2-get-token-internal nil)))
+      (js2-unget-token)
+      tt)))
+
+(defalias 'js2-next-token 'js2-get-token)
+
+(defun js2-match-token (match &optional dont-unget)
+  "Get next token and return t if it matches MATCH, a bytecode.
+Returns nil and consumes nothing if MATCH is not the next token."
+  (if (/= (js2-get-token) match)
+      (ignore (unless dont-unget (js2-unget-token)))
+    t))
+
+(defun js2-match-contextual-kwd (name)
+  "Consume and return t if next token is `js2-NAME', and its
+string is NAME.  Returns nil and keeps current token otherwise."
+  (if (or (/= (js2-get-token) js2-NAME)
+          (not (string= (js2-current-token-string) name)))
+      (progn
+        (js2-unget-token)
+        nil)
+    (js2-record-face 'font-lock-keyword-face)
+    t))
+
+(defun js2-get-prop-name-token ()
+  (js2-get-token (and (>= js2-language-version 170) 'KEYWORD_IS_NAME)))
+
+(defun js2-match-prop-name ()
+  "Consume token and return t if next token is a valid property name.
+If `js2-language-version' is >= 180, a keyword or reserved word
+is considered valid name as well."
+  (if (eq js2-NAME (js2-get-prop-name-token))
+      t
+    (js2-unget-token)
+    nil))
+
+(defun js2-must-match-prop-name (msg-id &optional pos len)
+  (if (js2-match-prop-name)
+      t
+    (js2-report-error msg-id nil pos len)
+    nil))
+
+(defun js2-peek-token-or-eol ()
+  "Return js2-EOL if the next token immediately follows a newline.
+Else returns the next token.  Used in situations where we don't
+consider certain token types valid if they are preceded by a newline.
+One example is the postfix ++ or -- operator, which has to be on the
+same line as its operand."
+  (let ((tt (js2-get-token))
+        (follows-eol (js2-token-follows-eol-p (js2-current-token))))
+    (js2-unget-token)
+    (if follows-eol
+        js2-EOL
+      tt)))
+
+(defun js2-must-match (token msg-id &optional pos len)
+  "Match next token to token code TOKEN, or record a syntax error.
+MSG-ID is the error message to report if the match fails.
+Returns t on match, nil if no match."
+  (if (js2-match-token token t)
+      t
+    (js2-report-error msg-id nil pos len)
+    (js2-unget-token)
+    nil))
+
+(defun js2-must-match-name (msg-id)
+  (if (js2-match-token js2-NAME t)
+      t
+    (if (eq (js2-current-token-type) js2-RESERVED)
+        (js2-report-error "msg.reserved.id" (js2-current-token-string))
+      (js2-report-error msg-id)
+      (js2-unget-token))
+    nil))
+
+(defsubst js2-inside-function ()
+  (cl-plusp js2-nesting-of-function))
+
+(defun js2-set-requires-activation ()
+  (if (js2-function-node-p js2-current-script-or-fn)
+      (setf (js2-function-node-needs-activation js2-current-script-or-fn) t)))
+
+(defun js2-check-activation-name (name _token)
+  (when (js2-inside-function)
+    ;; skip language-version 1.2 check from Rhino
+    (if (or (string= "arguments" name)
+            (and js2-compiler-activation-names  ; only used in codegen
+                 (gethash name js2-compiler-activation-names)))
+        (js2-set-requires-activation))))
+
+(defun js2-set-is-generator ()
+  (let ((fn-node js2-current-script-or-fn))
+    (when (and (js2-function-node-p fn-node)
+               (not (js2-function-node-generator-type fn-node)))
+      (setf (js2-function-node-generator-type js2-current-script-or-fn) 'LEGACY))))
+
+(defun js2-must-have-xml ()
+  (unless js2-compiler-xml-available
+    (js2-report-error "msg.XML.not.available")))
+
+(defun js2-push-scope (scope)
+  "Push SCOPE, a `js2-scope', onto the lexical scope chain."
+  (cl-assert (js2-scope-p scope))
+  (cl-assert (null (js2-scope-parent-scope scope)))
+  (cl-assert (not (eq js2-current-scope scope)))
+  (setf (js2-scope-parent-scope scope) js2-current-scope
+        js2-current-scope scope))
+
+(defsubst js2-pop-scope ()
+  (setq js2-current-scope
+        (js2-scope-parent-scope js2-current-scope)))
+
+(defun js2-enter-loop (loop-node)
+  (push loop-node js2-loop-set)
+  (push loop-node js2-loop-and-switch-set)
+  (js2-push-scope loop-node)
+  ;; Tell the current labeled statement (if any) its statement,
+  ;; and set the jump target of the first label to the loop.
+  ;; These are used in `js2-parse-continue' to verify that the
+  ;; continue target is an actual labeled loop.  (And for codegen.)
+  (when js2-labeled-stmt
+    (setf (js2-labeled-stmt-node-stmt js2-labeled-stmt) loop-node
+          (js2-label-node-loop (car (js2-labeled-stmt-node-labels
+                                     js2-labeled-stmt))) loop-node)))
+
+(defun js2-exit-loop ()
+  (pop js2-loop-set)
+  (pop js2-loop-and-switch-set)
+  (js2-pop-scope))
+
+(defsubst js2-enter-switch (switch-node)
+  (push switch-node js2-loop-and-switch-set))
+
+(defsubst js2-exit-switch ()
+  (pop js2-loop-and-switch-set))
+
+(defun js2-parse (&optional buf cb)
+  "Tell the js2 parser to parse a region of JavaScript.
+
+BUF is a buffer or buffer name containing the code to parse.
+Call `narrow-to-region' first to parse only part of the buffer.
+
+The returned AST root node is given some additional properties:
+  `node-count' - total number of nodes in the AST
+  `buffer' - BUF.  The buffer it refers to may change or be killed,
+             so the value is not necessarily reliable.
+
+An optional callback CB can be specified to report parsing
+progress.  If `(functionp CB)' returns t, it will be called with
+the current line number once before parsing begins, then again
+each time the lexer reaches a new line number.
+
+CB can also be a list of the form `(symbol cb ...)' to specify
+multiple callbacks with different criteria.  Each symbol is a
+criterion keyword, and the following element is the callback to
+call
+
+  :line  - called whenever the line number changes
+  :token - called for each new token consumed
+
+The list of criteria could be extended to include entering or
+leaving a statement, an expression, or a function definition."
+  (if (and cb (not (functionp cb)))
+      (error "criteria callbacks not yet implemented"))
+  (let ((inhibit-point-motion-hooks t)
+        (js2-compiler-xml-available (>= js2-language-version 160))
+        ;; This is a recursive-descent parser, so give it a big stack.
+        (max-lisp-eval-depth (max max-lisp-eval-depth 3000))
+        (max-specpdl-size (max max-specpdl-size 3000))
+        (case-fold-search nil)
+        ast)
+    (with-current-buffer (or buf (current-buffer))
+      (setq js2-scanned-comments nil
+            js2-parsed-errors nil
+            js2-parsed-warnings nil
+            js2-imenu-recorder nil
+            js2-imenu-function-map nil
+            js2-label-set nil)
+      (js2-init-scanner)
+      (setq ast (js2-do-parse))
+      (unless js2-ts-hit-eof
+        (js2-report-error "msg.got.syntax.errors" (length js2-parsed-errors)))
+      (setf (js2-ast-root-errors ast) js2-parsed-errors
+            (js2-ast-root-warnings ast) js2-parsed-warnings)
+      ;; if we didn't find any declarations, put a dummy in this list so we
+      ;; don't end up re-parsing the buffer in `js2-mode-create-imenu-index'
+      (unless js2-imenu-recorder
+        (setq js2-imenu-recorder 'empty))
+      (run-hooks 'js2-parse-finished-hook)
+      ast)))
+
+;; Corresponds to Rhino's Parser.parse() method.
+(defun js2-do-parse ()
+  "Parse current buffer starting from current point.
+Scanner should be initialized."
+  (let ((pos js2-ts-cursor)
+        (end js2-ts-cursor)  ; in case file is empty
+        root n tt)
+    ;; initialize buffer-local parsing vars
+    (setf root (make-js2-ast-root :buffer (buffer-name) :pos pos)
+          js2-current-script-or-fn root
+          js2-current-scope root
+          js2-nesting-of-function 0
+          js2-labeled-stmt nil
+          js2-recorded-identifiers nil)  ; for js2-highlight
+    (while (/= (setq tt (js2-get-token)) js2-EOF)
+      (if (= tt js2-FUNCTION)
+          (progn
+            (setq n (if js2-called-by-compile-function
+                        (js2-parse-function-expr)
+                      (js2-parse-function-stmt))))
+        ;; not a function - parse a statement
+        (js2-unget-token)
+        (setq n (js2-parse-statement)))
+      ;; add function or statement to script
+      (setq end (js2-node-end n))
+      (js2-block-node-push root n))
+    ;; add comments to root in lexical order
+    (when js2-scanned-comments
+      ;; if we find a comment beyond end of normal kids, use its end
+      (setq end (max end (js2-node-end (cl-first js2-scanned-comments))))
+      (dolist (comment js2-scanned-comments)
+        (push comment (js2-ast-root-comments root))
+        (js2-node-add-children root comment)))
+    (setf (js2-node-len root) (- end pos))
+    (setq js2-mode-ast root)  ; Make sure this is available for callbacks.
+    ;; Give extensions a chance to muck with things before highlighting starts.
+    (let ((js2-additional-externs js2-additional-externs))
+      (save-excursion
+        (run-hooks 'js2-post-parse-callbacks))
+      (js2-highlight-undeclared-vars))
+    root))
+
+(defun js2-parse-function-closure-body (fn-node)
+  "Parse a JavaScript 1.8 function closure body."
+  (let ((js2-nesting-of-function (1+ js2-nesting-of-function)))
+    (if js2-ts-hit-eof
+        (js2-report-error "msg.no.brace.body" nil
+                          (js2-node-pos fn-node)
+                          (- js2-ts-cursor (js2-node-pos fn-node)))
+      (js2-node-add-children fn-node
+                             (setf (js2-function-node-body fn-node)
+                                   (js2-parse-expr t))))))
+
+(defun js2-parse-function-body (fn-node)
+  (js2-must-match js2-LC "msg.no.brace.body"
+                  (js2-node-pos fn-node)
+                  (- js2-ts-cursor (js2-node-pos fn-node)))
+  (let ((pos (js2-current-token-beg))         ; LC position
+        (pn (make-js2-block-node))  ; starts at LC position
+        tt
+        end)
+    (cl-incf js2-nesting-of-function)
+    (unwind-protect
+        (while (not (or (= (setq tt (js2-peek-token)) js2-ERROR)
+                        (= tt js2-EOF)
+                        (= tt js2-RC)))
+          (js2-block-node-push pn (if (/= tt js2-FUNCTION)
+                                      (js2-parse-statement)
+                                    (js2-get-token)
+                                    (js2-parse-function-stmt))))
+      (cl-decf js2-nesting-of-function))
+    (setq end (js2-current-token-end))  ; assume no curly and leave at current token
+    (if (js2-must-match js2-RC "msg.no.brace.after.body" pos)
+        (setq end (js2-current-token-end)))
+    (setf (js2-node-pos pn) pos
+          (js2-node-len pn) (- end pos))
+    (setf (js2-function-node-body fn-node) pn)
+    (js2-node-add-children fn-node pn)
+    pn))
+
+(defun js2-define-destruct-symbols (node decl-type face &optional ignore-not-in-block)
+  "Declare and fontify destructuring parameters inside NODE.
+NODE is either `js2-array-node', `js2-object-node', or `js2-name-node'."
+  (cond
+   ((js2-name-node-p node)
+    (let (leftpos)
+      (js2-define-symbol decl-type (js2-name-node-name node)
+                         node ignore-not-in-block)
+      (when face
+        (js2-set-face (setq leftpos (js2-node-abs-pos node))
+                      (+ leftpos (js2-node-len node))
+                      face 'record))))
+   ((js2-object-node-p node)
+    (dolist (elem (js2-object-node-elems node))
+      (js2-define-destruct-symbols
+       ;; In abbreviated destructuring {a, b}, right == left.
+       (js2-object-prop-node-right elem)
+       decl-type face ignore-not-in-block)))
+   ((js2-array-node-p node)
+    (dolist (elem (js2-array-node-elems node))
+      (when elem
+        (js2-define-destruct-symbols elem decl-type face ignore-not-in-block))))
+   (t (js2-report-error "msg.no.parm" nil (js2-node-abs-pos node)
+                        (js2-node-len node)))))
+
+(defun js2-parse-function-params (function-type fn-node pos)
+  (if (js2-match-token js2-RP)
+      (setf (js2-function-node-rp fn-node) (- (js2-current-token-beg) pos))
+    (let ((paren-free-arrow (and (eq function-type 'FUNCTION_ARROW)
+                                 (eq (js2-current-token-type) js2-NAME)))
+          params param default-found rest-param-at)
+      (when paren-free-arrow
+        (js2-unget-token))
+      (cl-loop for tt = (js2-peek-token)
+               do
+               (cond
+                ;; destructuring param
+                ((and (not paren-free-arrow)
+                      (or (= tt js2-LB) (= tt js2-LC)))
+                 (js2-get-token)
+                 (when default-found
+                   (js2-report-error "msg.no.default.after.default.param"))
+                 (setq param (js2-parse-destruct-primary-expr))
+                 (js2-define-destruct-symbols param
+                                              js2-LP
+                                              'js2-function-param)
+                 (push param params))
+                ;; variable name
+                (t
+                 (when (and (>= js2-language-version 200)
+                            (not paren-free-arrow)
+                            (js2-match-token js2-TRIPLEDOT)
+                            (not rest-param-at))
+                   ;; to report errors if there are more parameters
+                   (setq rest-param-at (length params)))
+                 (js2-must-match-name "msg.no.parm")
+                 (js2-record-face 'js2-function-param)
+                 (setq param (js2-create-name-node))
+                 (js2-define-symbol js2-LP (js2-current-token-string) param)
+                 ;; default parameter value
+                 (when (or (and default-found
+                                (not rest-param-at)
+                                (js2-must-match js2-ASSIGN
+                                                "msg.no.default.after.default.param"
+                                                (js2-node-pos param)
+                                                (js2-node-len param)))
+                           (and (>= js2-language-version 200)
+                                (js2-match-token js2-ASSIGN)))
+                   (cl-assert (not paren-free-arrow))
+                   (let* ((pos (js2-node-pos param))
+                          (tt (js2-current-token-type))
+                          (op-pos (- (js2-current-token-beg) pos))
+                          (left param)
+                          (right (js2-parse-assign-expr))
+                          (len (- (js2-node-end right) pos)))
+                     (setq param (make-js2-assign-node
+                                  :type tt :pos pos :len len :op-pos op-pos
+                                  :left left :right right)
+                           default-found t)
+                     (js2-node-add-children param left right)))
+                 (push param params)))
+               (when (and rest-param-at (> (length params) (1+ rest-param-at)))
+                 (js2-report-error "msg.param.after.rest" nil
+                                   (js2-node-pos param) (js2-node-len param)))
+               while
+               (js2-match-token js2-COMMA))
+      (when (and (not paren-free-arrow)
+                 (js2-must-match js2-RP "msg.no.paren.after.parms"))
+        (setf (js2-function-node-rp fn-node) (- (js2-current-token-beg) pos)))
+      (when rest-param-at
+        (setf (js2-function-node-rest-p fn-node) t))
+      (dolist (p params)
+        (js2-node-add-children fn-node p)
+        (push p (js2-function-node-params fn-node))))))
+
+(defun js2-check-inconsistent-return-warning (fn-node name)
+  "Possibly show inconsistent-return warning.
+Last token scanned is the close-curly for the function body."
+  (when (and js2-mode-show-strict-warnings
+             js2-strict-inconsistent-return-warning
+             (not (js2-has-consistent-return-usage
+                   (js2-function-node-body fn-node))))
+    ;; Have it extend from close-curly to bol or beginning of block.
+    (let ((pos (save-excursion
+                 (goto-char (js2-current-token-end))
+                 (max (js2-node-abs-pos (js2-function-node-body fn-node))
+                      (point-at-bol))))
+          (end (js2-current-token-end)))
+      (if (cl-plusp (js2-name-node-length name))
+          (js2-add-strict-warning "msg.no.return.value"
+                                  (js2-name-node-name name) pos end)
+        (js2-add-strict-warning "msg.anon.no.return.value" nil pos end)))))
+
+(defun js2-parse-function-stmt ()
+  (let ((pos (js2-current-token-beg))
+        (star-p (js2-match-token js2-MUL)))
+    (js2-must-match-name "msg.unnamed.function.stmt")
+    (let ((name (js2-create-name-node t))
+          pn member-expr)
+      (cond
+       ((js2-match-token js2-LP)
+        (js2-parse-function 'FUNCTION_STATEMENT pos star-p name))
+       (js2-allow-member-expr-as-function-name
+        (setq member-expr (js2-parse-member-expr-tail nil name))
+        (js2-parse-highlight-member-expr-fn-name member-expr)
+        (js2-must-match js2-LP "msg.no.paren.parms")
+        (setf pn (js2-parse-function 'FUNCTION_STATEMENT pos star-p)
+              (js2-function-node-member-expr pn) member-expr)
+        pn)
+       (t
+        (js2-report-error "msg.no.paren.parms")
+        (make-js2-error-node))))))
+
+(defun js2-parse-function-expr ()
+  (let ((pos (js2-current-token-beg))
+        (star-p (js2-match-token js2-MUL))
+        name)
+    (when (js2-match-token js2-NAME)
+      (setq name (js2-create-name-node t)))
+    (js2-must-match js2-LP "msg.no.paren.parms")
+    (js2-parse-function 'FUNCTION_EXPRESSION pos star-p name)))
+
+(defun js2-parse-function (function-type pos star-p &optional name)
+  "Function parser.  FUNCTION-TYPE is a symbol, POS is the
+beginning of the first token (function keyword, unless it's an
+arrow function), NAME is js2-name-node."
+  (let (fn-node lp)
+    (if (= (js2-current-token-type) js2-LP) ; eventually matched LP?
+        (setq lp (js2-current-token-beg)))
+    (setf fn-node (make-js2-function-node :pos pos
+                                          :name name
+                                          :form function-type
+                                          :lp (if lp (- lp pos))
+                                          :generator-type (and star-p 'STAR)))
+    (when name
+      (js2-set-face (js2-node-pos name) (js2-node-end name)
+                    'font-lock-function-name-face 'record)
+      (when (and (eq function-type 'FUNCTION_STATEMENT)
+                 (cl-plusp (js2-name-node-length name)))
+        ;; Function statements define a symbol in the enclosing scope
+        (js2-define-symbol js2-FUNCTION (js2-name-node-name name) fn-node)))
+    (if (or (js2-inside-function) (cl-plusp js2-nesting-of-with))
+        ;; 1. Nested functions are not affected by the dynamic scope flag
+        ;;    as dynamic scope is already a parent of their scope.
+        ;; 2. Functions defined under the with statement also immune to
+        ;;    this setup, in which case dynamic scope is ignored in favor
+        ;;    of the with object.
+        (setf (js2-function-node-ignore-dynamic fn-node) t))
+    ;; dynamically bind all the per-function variables
+    (let ((js2-current-script-or-fn fn-node)
+          (js2-current-scope fn-node)
+          (js2-nesting-of-with 0)
+          (js2-end-flags 0)
+          js2-label-set
+          js2-loop-set
+          js2-loop-and-switch-set)
+      (js2-parse-function-params function-type fn-node pos)
+      (when (eq function-type 'FUNCTION_ARROW)
+        (js2-must-match js2-ARROW "msg.bad.arrow.args"))
+      (if (and (>= js2-language-version 180)
+               (/= (js2-peek-token) js2-LC))
+          (js2-parse-function-closure-body fn-node)
+        (js2-parse-function-body fn-node))
+      (js2-check-inconsistent-return-warning fn-node name)
+
+      (when name
+        (js2-node-add-children fn-node name)
+        ;; Function expressions define a name only in the body of the
+        ;; function, and only if not hidden by a parameter name
+        (when (and (eq function-type 'FUNCTION_EXPRESSION)
+                   (null (js2-scope-get-symbol js2-current-scope
+                                               (js2-name-node-name name))))
+          (js2-define-symbol js2-FUNCTION
+                             (js2-name-node-name name)
+                             fn-node))
+        (when (eq function-type 'FUNCTION_STATEMENT)
+          (js2-record-imenu-functions fn-node))))
+
+    (setf (js2-node-len fn-node) (- js2-ts-cursor pos))
+    ;; Rhino doesn't do this, but we need it for finding undeclared vars.
+    ;; We wait until after parsing the function to set its parent scope,
+    ;; since `js2-define-symbol' needs the defining-scope check to stop
+    ;; at the function boundary when checking for redeclarations.
+    (setf (js2-scope-parent-scope fn-node) js2-current-scope)
+    fn-node))
+
+(defun js2-parse-statements (&optional parent)
+  "Parse a statement list.  Last token consumed must be js2-LC.
+
+PARENT can be a `js2-block-node', in which case the statements are
+appended to PARENT.  Otherwise a new `js2-block-node' is created
+and returned.
+
+This function does not match the closing js2-RC: the caller
+matches the RC so it can provide a suitable error message if not
+matched.  This means it's up to the caller to set the length of
+the node to include the closing RC.  The node start pos is set to
+the absolute buffer start position, and the caller should fix it
+up to be relative to the parent node.  All children of this block
+node are given relative start positions and correct lengths."
+  (let ((pn (or parent (make-js2-block-node)))
+        tt)
+    (while (and (> (setq tt (js2-peek-token)) js2-EOF)
+                (/= tt js2-RC))
+      (js2-block-node-push pn (js2-parse-statement)))
+    pn))
+
+(defun js2-parse-statement ()
+  (let (pn beg end)
+    ;; coarse-grained user-interrupt check - needs work
+    (and js2-parse-interruptable-p
+         (zerop (% (cl-incf js2-parse-stmt-count)
+                   js2-statements-per-pause))
+         (input-pending-p)
+         (throw 'interrupted t))
+    (setq pn (js2-statement-helper))
+    ;; no-side-effects warning check
+    (unless (js2-node-has-side-effects pn)
+      (setq end (js2-node-end pn))
+      (save-excursion
+        (goto-char end)
+        (setq beg (max (js2-node-pos pn) (point-at-bol))))
+      (js2-add-strict-warning "msg.no.side.effects" nil beg end))
+    pn))
+
+;; These correspond to the switch cases in Parser.statementHelper
+(defconst js2-parsers
+  (let ((parsers (make-vector js2-num-tokens
+                                #'js2-parse-expr-stmt)))
+    (aset parsers js2-BREAK     #'js2-parse-break)
+    (aset parsers js2-CLASS     #'js2-parse-class-stmt)
+    (aset parsers js2-CONST     #'js2-parse-const-var)
+    (aset parsers js2-CONTINUE  #'js2-parse-continue)
+    (aset parsers js2-DEBUGGER  #'js2-parse-debugger)
+    (aset parsers js2-DEFAULT   #'js2-parse-default-xml-namespace)
+    (aset parsers js2-DO        #'js2-parse-do)
+    (aset parsers js2-EXPORT    #'js2-parse-export)
+    (aset parsers js2-FOR       #'js2-parse-for)
+    (aset parsers js2-FUNCTION  #'js2-parse-function-stmt)
+    (aset parsers js2-IF        #'js2-parse-if)
+    (aset parsers js2-IMPORT    #'js2-parse-import)
+    (aset parsers js2-LC        #'js2-parse-block)
+    (aset parsers js2-LET       #'js2-parse-let-stmt)
+    (aset parsers js2-NAME      #'js2-parse-name-or-label)
+    (aset parsers js2-RETURN    #'js2-parse-ret-yield)
+    (aset parsers js2-SEMI      #'js2-parse-semi)
+    (aset parsers js2-SWITCH    #'js2-parse-switch)
+    (aset parsers js2-THROW     #'js2-parse-throw)
+    (aset parsers js2-TRY       #'js2-parse-try)
+    (aset parsers js2-VAR       #'js2-parse-const-var)
+    (aset parsers js2-WHILE     #'js2-parse-while)
+    (aset parsers js2-WITH      #'js2-parse-with)
+    (aset parsers js2-YIELD     #'js2-parse-ret-yield)
+    parsers)
+  "A vector mapping token types to parser functions.")
+
+(defun js2-parse-warn-missing-semi (beg end)
+  (and js2-mode-show-strict-warnings
+       js2-strict-missing-semi-warning
+       (js2-add-strict-warning
+        "msg.missing.semi" nil
+        ;; back up to beginning of statement or line
+        (max beg (save-excursion
+                   (goto-char end)
+                   (point-at-bol)))
+        end)))
+
+(defconst js2-no-semi-insertion
+  (list js2-IF
+        js2-SWITCH
+        js2-WHILE
+        js2-DO
+        js2-FOR
+        js2-TRY
+        js2-WITH
+        js2-LC
+        js2-ERROR
+        js2-SEMI
+        js2-CLASS
+        js2-FUNCTION)
+  "List of tokens that don't do automatic semicolon insertion.")
+
+(defconst js2-autoinsert-semi-and-warn
+  (list js2-ERROR js2-EOF js2-RC))
+
+(defun js2-statement-helper ()
+  (let* ((tt (js2-get-token))
+         (first-tt tt)
+         (parser (if (= tt js2-ERROR)
+                     #'js2-parse-semi
+                   (aref js2-parsers tt)))
+         pn)
+    ;; If the statement is set, then it's been told its label by now.
+    (and js2-labeled-stmt
+         (js2-labeled-stmt-node-stmt js2-labeled-stmt)
+         (setq js2-labeled-stmt nil))
+    (setq pn (funcall parser))
+    ;; Don't do auto semi insertion for certain statement types.
+    (unless (or (memq first-tt js2-no-semi-insertion)
+                (js2-labeled-stmt-node-p pn))
+      (js2-auto-insert-semicolon pn))
+    pn))
+
+(defun js2-auto-insert-semicolon (pn)
+  (let* ((tt (js2-get-token))
+         (pos (js2-node-pos pn)))
+      (cond
+       ((= tt js2-SEMI)
+        ;; extend the node bounds to include the semicolon.
+        (setf (js2-node-len pn) (- (js2-current-token-end) pos)))
+       ((memq tt js2-autoinsert-semi-and-warn)
+        (js2-unget-token) ; Not ';', do not consume.
+        ;; Autoinsert ;
+        (js2-parse-warn-missing-semi pos (js2-node-end pn)))
+       (t
+        (if (not (js2-token-follows-eol-p (js2-current-token)))
+            ;; Report error if no EOL or autoinsert ';' otherwise
+            (js2-report-error "msg.no.semi.stmt")
+          (js2-parse-warn-missing-semi pos (js2-node-end pn)))
+        (js2-unget-token) ; Not ';', do not consume.
+        ))))
+
+(defun js2-parse-condition ()
+  "Parse a parenthesized boolean expression, e.g. in an if- or while-stmt.
+The parens are discarded and the expression node is returned.
+The `pos' field of the return value is set to an absolute position
+that must be fixed up by the caller.
+Return value is a list (EXPR LP RP), with absolute paren positions."
+  (let (pn lp rp)
+    (if (js2-must-match js2-LP "msg.no.paren.cond")
+        (setq lp (js2-current-token-beg)))
+    (setq pn (js2-parse-expr))
+    (if (js2-must-match js2-RP "msg.no.paren.after.cond")
+        (setq rp (js2-current-token-beg)))
+    ;; Report strict warning on code like "if (a = 7) ..."
+    (if (and js2-strict-cond-assign-warning
+             (js2-assign-node-p pn))
+        (js2-add-strict-warning "msg.equal.as.assign" nil
+                                (js2-node-pos pn)
+                                (+ (js2-node-pos pn)
+                                   (js2-node-len pn))))
+    (list pn lp rp)))
+
+(defun js2-parse-if ()
+  "Parser for if-statement.  Last matched token must be js2-IF."
+  (let ((pos (js2-current-token-beg))
+        cond if-true if-false else-pos end pn)
+    (setq cond (js2-parse-condition)
+          if-true (js2-parse-statement)
+          if-false (if (js2-match-token js2-ELSE)
+                       (progn
+                         (setq else-pos (- (js2-current-token-beg) pos))
+                         (js2-parse-statement)))
+          end (js2-node-end (or if-false if-true))
+          pn (make-js2-if-node :pos pos
+                               :len (- end pos)
+                               :condition (car cond)
+                               :then-part if-true
+                               :else-part if-false
+                               :else-pos else-pos
+                               :lp (js2-relpos (cl-second cond) pos)
+                               :rp (js2-relpos (cl-third cond) pos)))
+    (js2-node-add-children pn (car cond) if-true if-false)
+    pn))
+
+(defun js2-parse-import ()
+  "Parse import statement. The current token must be js2-IMPORT."
+  (unless (js2-ast-root-p js2-current-scope)
+    (js2-report-error "msg.mod.import.decl.at.top.level"))
+  (let ((beg (js2-current-token-beg)))
+    (cond ((js2-match-token js2-STRING)
+           (make-js2-import-node
+            :pos beg
+            :len (- (js2-current-token-end) beg)
+            :module-id (js2-current-token-string)))
+          (t
+           (let* ((import-clause (js2-parse-import-clause))
+                  (from-clause (and import-clause (js2-parse-from-clause)))
+                  (module-id (when from-clause (js2-from-clause-node-module-id from-clause)))
+                  (node (make-js2-import-node
+                         :pos beg
+                         :len (- (js2-current-token-end) beg)
+                         :import import-clause
+                         :from from-clause
+                         :module-id module-id)))
+             (when import-clause
+               (js2-node-add-children node import-clause))
+             (when from-clause
+               (js2-node-add-children node from-clause))
+             node)))))
+
+(defun js2-parse-import-clause ()
+  "Parse the bindings in an import statement.
+This can take many forms:
+
+ImportedDefaultBinding -> 'foo'
+NameSpaceImport -> '* as lib'
+NamedImports -> '{foo as bar, bang}'
+ImportedDefaultBinding , NameSpaceImport -> 'foo, * as lib'
+ImportedDefaultBinding , NamedImports -> 'foo, {bar, baz as bif}'
+
+Try to match namespace imports and named imports first because nothing can
+come after them. If it is an imported default binding, then it could have named
+imports or a namespace import that follows it.
+"
+  (let* ((beg (js2-current-token-beg))
+         (clause (make-js2-import-clause-node
+                  :pos beg))
+         (children (list)))
+    (cond
+     ((js2-match-token js2-MUL)
+      (let ((ns-import (js2-parse-namespace-import)))
+        (when ns-import
+          (let ((name-node (js2-namespace-import-node-name ns-import)))
+            (js2-define-symbol
+             js2-LET (js2-name-node-name name-node) name-node t)))
+        (setf (js2-import-clause-node-namespace-import clause) ns-import)
+        (push ns-import children)))
+     ((js2-match-token js2-LC)
+      (let ((imports (js2-parse-export-bindings t)))
+        (setf (js2-import-clause-node-named-imports clause) imports)
+        (dolist (import imports)
+          (push import children)
+          (let ((name-node (js2-export-binding-node-local-name import)))
+            (when name-node
+              (js2-define-symbol
+               js2-LET (js2-name-node-name name-node) name-node t))))))
+     ((= (js2-peek-token) js2-NAME)
+      (let ((binding (js2-maybe-parse-export-binding)))
+        (let ((node-name (js2-export-binding-node-local-name binding)))
+          (js2-define-symbol js2-LET (js2-name-node-name node-name) node-name t))
+        (setf (js2-import-clause-node-default-binding clause) binding)
+        (push binding children))
+      (when (js2-match-token js2-COMMA)
+        (cond
+         ((js2-match-token js2-MUL)
+          (let ((ns-import (js2-parse-namespace-import)))
+            (let ((name-node (js2-namespace-import-node-name ns-import)))
+              (js2-define-symbol
+               js2-LET (js2-name-node-name name-node) name-node t))
+            (setf (js2-import-clause-node-namespace-import clause) ns-import)
+            (push ns-import children)))
+         ((js2-match-token js2-LC)
+          (let ((imports (js2-parse-export-bindings t)))
+            (setf (js2-import-clause-node-named-imports clause) imports)
+            (dolist (import imports)
+              (push import children)
+              (let ((name-node (js2-export-binding-node-local-name import)))
+                (when name-node
+                  (js2-define-symbol
+                   js2-LET (js2-name-node-name name-node) name-node t))))))
+         (t (js2-report-error "msg.syntax")))))
+     (t (js2-report-error "msg.mod.declaration.after.import")))
+    (setf (js2-node-len clause) (- (js2-current-token-end) beg))
+    (apply #'js2-node-add-children clause children)
+    clause))
+
+(defun js2-parse-namespace-import ()
+  "Parse a namespace import expression such as  '* as bar'.
+The current token must be js2-MUL."
+  (let ((beg (js2-current-token-beg)))
+    (when (js2-must-match js2-NAME "msg.syntax")
+        (if (equal "as" (js2-current-token-string))
+            (when (js2-must-match-prop-name "msg.syntax")
+              (let ((node (make-js2-namespace-import-node
+                           :pos beg
+                           :len (- (js2-current-token-end) beg)
+                           :name (make-js2-name-node
+                                  :pos (js2-current-token-beg)
+                                  :len (js2-current-token-end)
+                                  :name (js2-current-token-string)))))
+                (js2-node-add-children node (js2-namespace-import-node-name node))
+                node))
+          (js2-unget-token)
+          (js2-report-error "msg.syntax")))))
+
+
+(defun js2-parse-from-clause ()
+  "Parse the from clause in an import or export statement. E.g. from 'src/lib'"
+  (when (js2-must-match-name "msg.mod.from.after.import.spec.set")
+    (let ((beg (js2-current-token-beg)))
+      (if (equal "from" (js2-current-token-string))
+          (cond
+           ((js2-match-token js2-STRING)
+            (make-js2-from-clause-node
+             :pos beg
+             :len (- (js2-current-token-end) beg)
+             :module-id (js2-current-token-string)
+             :metadata-p nil))
+           ((js2-match-token js2-THIS)
+            (when (js2-must-match-name "msg.mod.spec.after.from")
+              (if (equal "module" (js2-current-token-string))
+                  (make-js2-from-clause-node
+                   :pos beg
+                   :len (- (js2-current-token-end) beg)
+                   :module-id "this"
+                   :metadata-p t)
+                (js2-unget-token)
+                (js2-unget-token)
+                (js2-report-error "msg.mod.spec.after.from")
+                nil)))
+           (t (js2-report-error "msg.mod.spec.after.from") nil))
+        (js2-unget-token)
+        (js2-report-error "msg.mod.from.after.import.spec.set")
+        nil))))
+
+(defun js2-parse-export-bindings (&optional import-p)
+  "Parse a list of export binding expressions such as {}, {foo, bar}, and
+{foo as bar, baz as bang}. The current token must be
+js2-LC. Return a lisp list of js2-export-binding-node"
+  (let ((bindings (list)))
+    (while
+        (let ((binding (js2-maybe-parse-export-binding)))
+          (when binding
+            (push binding bindings))
+          (js2-match-token js2-COMMA)))
+    (when (js2-must-match js2-RC (if import-p
+                                     "msg.mod.rc.after.import.spec.list"
+                                   "msg.mod.rc.after.export.spec.list"))
+      (reverse bindings))))
+
+(defun js2-maybe-parse-export-binding ()
+  "Attempt to parse a binding expression found inside an import/export statement.
+This can take the form of either as single js2-NAME token as in 'foo' or as in a
+rebinding expression 'bar as foo'. If it matches, it will return an instance of
+js2-export-binding-node and consume all the tokens. If it does not match, it
+consumes no tokens."
+  (let ((extern-name (when (js2-match-prop-name) (js2-current-token-string)))
+        (beg (js2-current-token-beg))
+        (extern-name-len (js2-current-token-len))
+        (is-reserved-name (or (= (js2-current-token-type) js2-RESERVED)
+                              (aref js2-kwd-tokens (js2-current-token-type)))))
+    (if extern-name
+        (let ((as (and (js2-match-token js2-NAME) (js2-current-token-string))))
+          (if (and as (equal "as" (js2-current-token-string)))
+              (let ((name
+                     (or
+                      (and (js2-match-token js2-DEFAULT) "default")
+                      (and (js2-match-token js2-NAME) (js2-current-token-string)))))
+                (if name
+                    (let ((node (make-js2-export-binding-node
+                                 :pos beg
+                                 :len (- (js2-current-token-end) beg)
+                                 :local-name (make-js2-name-node
+                                              :name name
+                                              :pos (js2-current-token-beg)
+                                              :len (js2-current-token-len))
+                                 :extern-name (make-js2-name-node
+                                               :name extern-name
+                                               :pos beg
+                                               :len extern-name-len))))
+                      (js2-node-add-children
+                       node
+                       (js2-export-binding-node-local-name node)
+                       (js2-export-binding-node-extern-name node))
+                      node)
+                  (js2-unget-token)
+                  nil))
+            (when as (js2-unget-token))
+            (let* ((name-node (make-js2-name-node
+                              :name (js2-current-token-string)
+                              :pos (js2-current-token-beg)
+                              :len (js2-current-token-len)))
+                  (node (make-js2-export-binding-node
+                         :pos (js2-current-token-beg)
+                         :len (js2-current-token-len)
+                         :local-name name-node
+                         :extern-name name-node)))
+              (when is-reserved-name
+                (js2-report-error "msg.mod.as.after.reserved.word" extern-name))
+              (js2-node-add-children node name-node)
+              node)))
+      nil)))
+
+(defun js2-parse-switch ()
+  "Parser for switch-statement.  Last matched token must be js2-SWITCH."
+  (let ((pos (js2-current-token-beg))
+        tt pn discriminant has-default case-expr case-node
+        case-pos cases stmt lp)
+    (if (js2-must-match js2-LP "msg.no.paren.switch")
+        (setq lp (js2-current-token-beg)))
+    (setq discriminant (js2-parse-expr)
+          pn (make-js2-switch-node :discriminant discriminant
+                                   :pos pos
+                                   :lp (js2-relpos lp pos)))
+    (js2-node-add-children pn discriminant)
+    (js2-enter-switch pn)
+    (unwind-protect
+        (progn
+          (if (js2-must-match js2-RP "msg.no.paren.after.switch")
+              (setf (js2-switch-node-rp pn) (- (js2-current-token-beg) pos)))
+          (js2-must-match js2-LC "msg.no.brace.switch")
+          (catch 'break
+            (while t
+              (setq tt (js2-next-token)
+                    case-pos (js2-current-token-beg))
+              (cond
+               ((= tt js2-RC)
+                (setf (js2-node-len pn) (- (js2-current-token-end) pos))
+                (throw 'break nil))  ; done
+               ((= tt js2-CASE)
+                (setq case-expr (js2-parse-expr))
+                (js2-must-match js2-COLON "msg.no.colon.case"))
+               ((= tt js2-DEFAULT)
+                (if has-default
+                    (js2-report-error "msg.double.switch.default"))
+                (setq has-default t
+                      case-expr nil)
+                (js2-must-match js2-COLON "msg.no.colon.case"))
+               (t
+                (js2-report-error "msg.bad.switch")
+                (throw 'break nil)))
+              (setq case-node (make-js2-case-node :pos case-pos
+                                                  :len (- (js2-current-token-end) case-pos)
+                                                  :expr case-expr))
+              (js2-node-add-children case-node case-expr)
+              (while (and (/= (setq tt (js2-peek-token)) js2-RC)
+                          (/= tt js2-CASE)
+                          (/= tt js2-DEFAULT)
+                          (/= tt js2-EOF))
+                (setf stmt (js2-parse-statement)
+                      (js2-node-len case-node) (- (js2-node-end stmt) case-pos))
+                (js2-block-node-push case-node stmt))
+              (push case-node cases)))
+          ;; add cases last, as pushing reverses the order to be correct
+          (dolist (kid cases)
+            (js2-node-add-children pn kid)
+            (push kid (js2-switch-node-cases pn)))
+          pn)  ; return value
+      (js2-exit-switch))))
+
+(defun js2-parse-while ()
+  "Parser for while-statement.  Last matched token must be js2-WHILE."
+  (let ((pos (js2-current-token-beg))
+        (pn (make-js2-while-node))
+        cond body)
+    (js2-enter-loop pn)
+    (unwind-protect
+        (progn
+          (setf cond (js2-parse-condition)
+                (js2-while-node-condition pn) (car cond)
+                body (js2-parse-statement)
+                (js2-while-node-body pn) body
+                (js2-node-len pn) (- (js2-node-end body) pos)
+                (js2-while-node-lp pn) (js2-relpos (cl-second cond) pos)
+                (js2-while-node-rp pn) (js2-relpos (cl-third cond) pos))
+          (js2-node-add-children pn body (car cond)))
+      (js2-exit-loop))
+    pn))
+
+(defun js2-parse-do ()
+  "Parser for do-statement.  Last matched token must be js2-DO."
+  (let ((pos (js2-current-token-beg))
+        (pn (make-js2-do-node))
+        cond body end)
+    (js2-enter-loop pn)
+    (unwind-protect
+        (progn
+          (setq body (js2-parse-statement))
+          (js2-must-match js2-WHILE "msg.no.while.do")
+          (setf (js2-do-node-while-pos pn) (- (js2-current-token-beg) pos)
+                cond (js2-parse-condition)
+                (js2-do-node-condition pn) (car cond)
+                (js2-do-node-body pn) body
+                end js2-ts-cursor
+                (js2-do-node-lp pn) (js2-relpos (cl-second cond) pos)
+                (js2-do-node-rp pn) (js2-relpos (cl-third cond) pos))
+          (js2-node-add-children pn (car cond) body))
+      (js2-exit-loop))
+    ;; Always auto-insert semicolon to follow SpiderMonkey:
+    ;; It is required by ECMAScript but is ignored by the rest of
+    ;; world; see bug 238945
+    (if (js2-match-token js2-SEMI)
+        (setq end js2-ts-cursor))
+    (setf (js2-node-len pn) (- end pos))
+    pn))
+
+(defun js2-parse-export ()
+  "Parse an export statement.
+The Last matched token must be js2-EXPORT. Currently, the 'default' and 'expr'
+expressions should only be either hoistable expressions (function or generator)
+or assignment expressions, but there is no checking to enforce that and so it
+will parse without error a small subset of
+invalid export statements."
+  (unless (js2-ast-root-p js2-current-scope)
+    (js2-report-error "msg.mod.export.decl.at.top.level"))
+  (let ((beg (js2-current-token-beg))
+        (children (list))
+        exports-list from-clause declaration default)
+    (cond
+     ((js2-match-token js2-MUL)
+      (setq from-clause (js2-parse-from-clause))
+      (when from-clause
+        (push from-clause children)))
+     ((js2-match-token js2-LC)
+      (setq exports-list (js2-parse-export-bindings))
+      (when exports-list
+        (dolist (export exports-list)
+          (push export children)))
+      (when (js2-match-token js2-NAME)
+        (if (equal "from" (js2-current-token-string))
+            (progn
+              (js2-unget-token)
+              (setq from-clause (js2-parse-from-clause)))
+          (js2-unget-token))))
+     ((js2-match-token js2-DEFAULT)
+      (setq default (js2-parse-expr)))
+     ((or (js2-match-token js2-VAR) (js2-match-token js2-CONST) (js2-match-token js2-LET))
+      (setq declaration (js2-parse-variables (js2-current-token-type) (js2-current-token-beg))))
+     (t
+      (setq declaration (js2-parse-expr))))
+    (when from-clause
+      (push from-clause children))
+    (when declaration
+      (push declaration children))
+    (when default
+      (push default children))
+    (let ((node (make-js2-export-node
+                  :pos beg
+                  :len (- (js2-current-token-end) beg)
+                  :exports-list exports-list
+                  :from-clause from-clause
+                  :declaration declaration
+                  :default default)))
+      (apply #'js2-node-add-children node children)
+      node)))
+
+(defun js2-parse-for ()
+  "Parse a for, for-in or for each-in statement.
+Last matched token must be js2-FOR."
+  (let ((for-pos (js2-current-token-beg))
+        pn is-for-each is-for-in-or-of is-for-of
+        in-pos each-pos tmp-pos
+        init  ; Node init is also foo in 'foo in object'.
+        cond  ; Node cond is also object in 'foo in object'.
+        incr  ; 3rd section of for-loop initializer.
+        body tt lp rp)
+    ;; See if this is a for each () instead of just a for ()
+    (when (js2-match-token js2-NAME)
+      (if (string= "each" (js2-current-token-string))
+          (progn
+            (setq is-for-each t
+                  each-pos (- (js2-current-token-beg) for-pos)) ; relative
+            (js2-record-face 'font-lock-keyword-face))
+        (js2-report-error "msg.no.paren.for")))
+    (if (js2-must-match js2-LP "msg.no.paren.for")
+        (setq lp (- (js2-current-token-beg) for-pos)))
+    (setq tt (js2-get-token))
+    ;; 'for' makes local scope
+    (js2-push-scope (make-js2-scope))
+    (unwind-protect
+        ;; parse init clause
+        (let ((js2-in-for-init t))  ; set as dynamic variable
+          (cond
+           ((= tt js2-SEMI)
+            (js2-unget-token)
+            (setq init (make-js2-empty-expr-node)))
+           ((or (= tt js2-VAR) (= tt js2-LET))
+            (setq init (js2-parse-variables tt (js2-current-token-beg))))
+           (t
+            (js2-unget-token)
+            (setq init (js2-parse-expr)))))
+      (if (or (js2-match-token js2-IN)
+              (and (>= js2-language-version 200)
+                   (js2-match-contextual-kwd "of")
+                   (setq is-for-of t)))
+          (setq is-for-in-or-of t
+                in-pos (- (js2-current-token-beg) for-pos)
+                ;; scope of iteration target object is not the scope we've created above.
+                ;; stash current scope temporary.
+                cond (let ((js2-current-scope (js2-scope-parent-scope js2-current-scope)))
+                       (js2-parse-expr)))  ; object over which we're iterating
+        ;; else ordinary for loop - parse cond and incr
+        (js2-must-match js2-SEMI "msg.no.semi.for")
+        (setq cond (if (= (js2-peek-token) js2-SEMI)
+                       (make-js2-empty-expr-node) ; no loop condition
+                     (js2-parse-expr)))
+        (js2-must-match js2-SEMI "msg.no.semi.for.cond")
+        (setq tmp-pos (js2-current-token-end)
+              incr (if (= (js2-peek-token) js2-RP)
+                       (make-js2-empty-expr-node :pos tmp-pos)
+                     (js2-parse-expr))))
+      (if (js2-must-match js2-RP "msg.no.paren.for.ctrl")
+          (setq rp (- (js2-current-token-beg) for-pos)))
+      (if (not is-for-in-or-of)
+          (setq pn (make-js2-for-node :init init
+                                      :condition cond
+                                      :update incr
+                                      :lp lp
+                                      :rp rp))
+        ;; cond could be null if 'in obj' got eaten by the init node.
+        (if (js2-infix-node-p init)
+            ;; it was (foo in bar) instead of (var foo in bar)
+            (setq cond (js2-infix-node-right init)
+                  init (js2-infix-node-left init))
+          (if (and (js2-var-decl-node-p init)
+                   (> (length (js2-var-decl-node-kids init)) 1))
+              (js2-report-error "msg.mult.index")))
+        (setq pn (make-js2-for-in-node :iterator init
+                                       :object cond
+                                       :in-pos in-pos
+                                       :foreach-p is-for-each
+                                       :each-pos each-pos
+                                       :forof-p is-for-of
+                                       :lp lp
+                                       :rp rp)))
+      (unwind-protect
+          (progn
+            (js2-enter-loop pn)
+            ;; We have to parse the body -after- creating the loop node,
+            ;; so that the loop node appears in the js2-loop-set, allowing
+            ;; break/continue statements to find the enclosing loop.
+            (setf body (js2-parse-statement)
+                  (js2-loop-node-body pn) body
+                  (js2-node-pos pn) for-pos
+                  (js2-node-len pn) (- (js2-node-end body) for-pos))
+            (js2-node-add-children pn init cond incr body))
+        ;; finally
+        (js2-exit-loop))
+      (js2-pop-scope))
+    pn))
+
+(defun js2-parse-try ()
+  "Parse a try statement.  Last matched token must be js2-TRY."
+  (let ((try-pos (js2-current-token-beg))
+        try-end
+        try-block
+        catch-blocks
+        finally-block
+        saw-default-catch
+        peek)
+    (if (/= (js2-peek-token) js2-LC)
+        (js2-report-error "msg.no.brace.try"))
+    (setq try-block (js2-parse-statement)
+          try-end (js2-node-end try-block)
+          peek (js2-peek-token))
+    (cond
+     ((= peek js2-CATCH)
+      (while (js2-match-token js2-CATCH)
+        (let* ((catch-pos (js2-current-token-beg))
+               (catch-node (make-js2-catch-node :pos catch-pos))
+               param
+               guard-kwd
+               catch-cond
+               lp rp)
+          (if saw-default-catch
+              (js2-report-error "msg.catch.unreachable"))
+          (if (js2-must-match js2-LP "msg.no.paren.catch")
+              (setq lp (- (js2-current-token-beg) catch-pos)))
+          (js2-push-scope catch-node)
+          (let ((tt (js2-peek-token)))
+            (cond
+             ;; Destructuring pattern:
+             ;;     catch ({ message, file }) { ... }
+             ((or (= tt js2-LB) (= tt js2-LC))
+              (js2-get-token)
+              (setq param (js2-parse-destruct-primary-expr))
+              (js2-define-destruct-symbols param js2-LET nil))
+             ;; Simple name.
+             (t
+              (js2-must-match-name "msg.bad.catchcond")
+              (setq param (js2-create-name-node))
+              (js2-define-symbol js2-LET (js2-current-token-string) param))))
+          ;; Catch condition.
+          (if (js2-match-token js2-IF)
+              (setq guard-kwd (- (js2-current-token-beg) catch-pos)
+                    catch-cond (js2-parse-expr))
+            (setq saw-default-catch t))
+          (if (js2-must-match js2-RP "msg.bad.catchcond")
+              (setq rp (- (js2-current-token-beg) catch-pos)))
+          (js2-must-match js2-LC "msg.no.brace.catchblock")
+          (js2-parse-statements catch-node)
+          (if (js2-must-match js2-RC "msg.no.brace.after.body")
+              (setq try-end (js2-current-token-end)))
+          (js2-pop-scope)
+          (setf (js2-node-len catch-node) (- try-end catch-pos)
+                (js2-catch-node-param catch-node) param
+                (js2-catch-node-guard-expr catch-node) catch-cond
+                (js2-catch-node-guard-kwd catch-node) guard-kwd
+                (js2-catch-node-lp catch-node) lp
+                (js2-catch-node-rp catch-node) rp)
+          (js2-node-add-children catch-node param catch-cond)
+          (push catch-node catch-blocks))))
+     ((/= peek js2-FINALLY)
+      (js2-must-match js2-FINALLY "msg.try.no.catchfinally"
+                      (js2-node-pos try-block)
+                      (- (setq try-end (js2-node-end try-block))
+                         (js2-node-pos try-block)))))
+    (when (js2-match-token js2-FINALLY)
+      (let ((finally-pos (js2-current-token-beg))
+            (block (js2-parse-statement)))
+        (setq try-end (js2-node-end block)
+              finally-block (make-js2-finally-node :pos finally-pos
+                                                   :len (- try-end finally-pos)
+                                                   :body block))
+        (js2-node-add-children finally-block block)))
+    (let ((pn (make-js2-try-node :pos try-pos
+                                 :len (- try-end try-pos)
+                                 :try-block try-block
+                                 :finally-block finally-block)))
+      (js2-node-add-children pn try-block finally-block)
+      ;; Push them onto the try-node, which reverses and corrects their order.
+      (dolist (cb catch-blocks)
+        (js2-node-add-children pn cb)
+        (push cb (js2-try-node-catch-clauses pn)))
+      pn)))
+
+(defun js2-parse-throw ()
+  "Parser for throw-statement.  Last matched token must be js2-THROW."
+  (let ((pos (js2-current-token-beg))
+        expr pn)
+    (if (= (js2-peek-token-or-eol) js2-EOL)
+        ;; ECMAScript does not allow new lines before throw expression,
+        ;; see bug 256617
+        (js2-report-error "msg.bad.throw.eol"))
+    (setq expr (js2-parse-expr)
+          pn (make-js2-throw-node :pos pos
+                                  :len (- (js2-node-end expr) pos)
+                                  :expr expr))
+    (js2-node-add-children pn expr)
+    pn))
+
+(defun js2-match-jump-label-name (label-name)
+  "If break/continue specified a label, return that label's labeled stmt.
+Returns the corresponding `js2-labeled-stmt-node', or if LABEL-NAME
+does not match an existing label, reports an error and returns nil."
+  (let ((bundle (cdr (assoc label-name js2-label-set))))
+    (if (null bundle)
+        (js2-report-error "msg.undef.label"))
+    bundle))
+
+(defun js2-parse-break ()
+  "Parser for break-statement.  Last matched token must be js2-BREAK."
+  (let ((pos (js2-current-token-beg))
+        (end (js2-current-token-end))
+        break-target ; statement to break from
+        break-label  ; in "break foo", name-node representing the foo
+        labels       ; matching labeled statement to break to
+        pn)
+    (when (eq (js2-peek-token-or-eol) js2-NAME)
+      (js2-get-token)
+      (setq break-label (js2-create-name-node)
+            end (js2-node-end break-label)
+            ;; matchJumpLabelName only matches if there is one
+            labels (js2-match-jump-label-name (js2-current-token-string))
+            break-target (if labels (car (js2-labeled-stmt-node-labels labels)))))
+    (unless (or break-target break-label)
+      ;; no break target specified - try for innermost enclosing loop/switch
+      (if (null js2-loop-and-switch-set)
+          (unless break-label
+            (js2-report-error "msg.bad.break" nil pos (length "break")))
+        (setq break-target (car js2-loop-and-switch-set))))
+    (setq pn (make-js2-break-node :pos pos
+                                  :len (- end pos)
+                                  :label break-label
+                                  :target break-target))
+    (js2-node-add-children pn break-label)  ; but not break-target
+    pn))
+
+(defun js2-parse-continue ()
+  "Parser for continue-statement.  Last matched token must be js2-CONTINUE."
+  (let ((pos (js2-current-token-beg))
+        (end (js2-current-token-end))
+        label   ; optional user-specified label, a `js2-name-node'
+        labels  ; current matching labeled stmt, if any
+        target  ; the `js2-loop-node' target of this continue stmt
+        pn)
+    (when (= (js2-peek-token-or-eol) js2-NAME)
+      (js2-get-token)
+      (setq label (js2-create-name-node)
+            end (js2-node-end label)
+            ;; matchJumpLabelName only matches if there is one
+            labels (js2-match-jump-label-name (js2-current-token-string))))
+    (cond
+     ((null labels)  ; no current label to go to
+      (if (null js2-loop-set)  ; no loop to continue to
+          (js2-report-error "msg.continue.outside" nil pos
+                            (length "continue"))
+        (setq target (car js2-loop-set))))  ; innermost enclosing loop
+     (t
+      (if (js2-loop-node-p (js2-labeled-stmt-node-stmt labels))
+          (setq target (js2-labeled-stmt-node-stmt labels))
+        (js2-report-error "msg.continue.nonloop" nil pos (- end pos)))))
+    (setq pn (make-js2-continue-node :pos pos
+                                     :len (- end pos)
+                                     :label label
+                                     :target target))
+    (js2-node-add-children pn label)  ; but not target - it's not our child
+    pn))
+
+(defun js2-parse-with ()
+  "Parser for with-statement.  Last matched token must be js2-WITH."
+  (let ((pos (js2-current-token-beg))
+        obj body pn lp rp)
+    (if (js2-must-match js2-LP "msg.no.paren.with")
+        (setq lp (js2-current-token-beg)))
+    (setq obj (js2-parse-expr))
+    (if (js2-must-match js2-RP "msg.no.paren.after.with")
+        (setq rp (js2-current-token-beg)))
+    (let ((js2-nesting-of-with (1+ js2-nesting-of-with)))
+        (setq body (js2-parse-statement)))
+    (setq pn (make-js2-with-node :pos pos
+                                 :len (- (js2-node-end body) pos)
+                                 :object obj
+                                 :body body
+                                 :lp (js2-relpos lp pos)
+                                 :rp (js2-relpos rp pos)))
+    (js2-node-add-children pn obj body)
+    pn))
+
+(defun js2-parse-const-var ()
+  "Parser for var- or const-statement.
+Last matched token must be js2-CONST or js2-VAR."
+  (let ((tt (js2-current-token-type))
+        (pos (js2-current-token-beg))
+        expr pn)
+    (setq expr (js2-parse-variables tt (js2-current-token-beg))
+          pn (make-js2-expr-stmt-node :pos pos
+                                      :len (- (js2-node-end expr) pos)
+                                      :expr expr))
+    (js2-node-add-children pn expr)
+    pn))
+
+(defun js2-wrap-with-expr-stmt (pos expr &optional add-child)
+  (let ((pn (make-js2-expr-stmt-node :pos pos
+                                     :len (js2-node-len expr)
+                                     :type (if (js2-inside-function)
+                                               js2-EXPR_VOID
+                                             js2-EXPR_RESULT)
+                                     :expr expr)))
+    (if add-child
+        (js2-node-add-children pn expr))
+    pn))
+
+(defun js2-parse-let-stmt ()
+  "Parser for let-statement.  Last matched token must be js2-LET."
+  (let ((pos (js2-current-token-beg))
+        expr pn)
+    (if (= (js2-peek-token) js2-LP)
+        ;; let expression in statement context
+        (setq expr (js2-parse-let pos 'statement)
+              pn (js2-wrap-with-expr-stmt pos expr t))
+      ;; else we're looking at a statement like let x=6, y=7;
+      (setf expr (js2-parse-variables js2-LET pos)
+            pn (js2-wrap-with-expr-stmt pos expr t)
+            (js2-node-type pn) js2-EXPR_RESULT))
+    pn))
+
+(defun js2-parse-ret-yield ()
+  (js2-parse-return-or-yield (js2-current-token-type) nil))
+
+(defconst js2-parse-return-stmt-enders
+  (list js2-SEMI js2-RC js2-EOF js2-EOL js2-ERROR js2-RB js2-RP js2-YIELD))
+
+(defsubst js2-now-all-set (before after mask)
+  "Return whether or not the bits in the mask have changed to all set.
+BEFORE is bits before change, AFTER is bits after change, and MASK is
+the mask for bits.  Returns t if all the bits in the mask are set in AFTER
+but not BEFORE."
+  (and (/= (logand before mask) mask)
+       (= (logand after mask) mask)))
+
+(defun js2-parse-return-or-yield (tt expr-context)
+  (let* ((pos (js2-current-token-beg))
+         (end (js2-current-token-end))
+         (before js2-end-flags)
+         (inside-function (js2-inside-function))
+         (gen-type (and inside-function (js2-function-node-generator-type
+                                         js2-current-script-or-fn)))
+         e ret name yield-star-p)
+    (unless inside-function
+      (js2-report-error (if (eq tt js2-RETURN)
+                            "msg.bad.return"
+                          "msg.bad.yield")))
+    (when (and inside-function
+               (eq gen-type 'STAR)
+               (js2-match-token js2-MUL))
+      (setq yield-star-p t))
+    ;; This is ugly, but we don't want to require a semicolon.
+    (unless (memq (js2-peek-token-or-eol) js2-parse-return-stmt-enders)
+      (setq e (js2-parse-expr)
+            end (js2-node-end e)))
+    (cond
+     ((eq tt js2-RETURN)
+      (js2-set-flag js2-end-flags (if (null e)
+                                      js2-end-returns
+                                    js2-end-returns-value))
+      (setq ret (make-js2-return-node :pos pos
+                                      :len (- end pos)
+                                      :retval e))
+      (js2-node-add-children ret e)
+      ;; See if we need a strict mode warning.
+      ;; TODO:  The analysis done by `js2-has-consistent-return-usage' is
+      ;; more thorough and accurate than this before/after flag check.
+      ;; E.g. if there's a finally-block that always returns, we shouldn't
+      ;; show a warning generated by inconsistent returns in the catch blocks.
+      ;; Basically `js2-has-consistent-return-usage' needs to keep more state,
+      ;; so we know which returns/yields to highlight, and we should get rid of
+      ;; all the checking in `js2-parse-return-or-yield'.
+      (if (and js2-strict-inconsistent-return-warning
+               (js2-now-all-set before js2-end-flags
+                                (logior js2-end-returns js2-end-returns-value)))
+          (js2-add-strict-warning "msg.return.inconsistent" nil pos end)))
+     ((eq gen-type 'COMPREHENSION)
+      ;; FIXME: We should probably switch to saving and using lastYieldOffset,
+      ;; like SpiderMonkey does.
+      (js2-report-error "msg.syntax" nil pos 5))
+     (t
+      (setq ret (make-js2-yield-node :pos pos
+                                     :len (- end pos)
+                                     :value e
+                                     :star-p yield-star-p))
+      (js2-node-add-children ret e)
+      (unless expr-context
+        (setq e ret
+              ret (js2-wrap-with-expr-stmt pos e t))
+      (js2-set-requires-activation)
+      (js2-set-is-generator))))
+    ;; see if we are mixing yields and value returns.
+    (when (and inside-function
+               (js2-flag-set-p js2-end-flags js2-end-returns-value)
+               (eq (js2-function-node-generator-type js2-current-script-or-fn)
+                   'LEGACY))
+      (setq name (js2-function-name js2-current-script-or-fn))
+      (if (zerop (length name))
+          (js2-report-error "msg.anon.generator.returns" nil pos (- end pos))
+        (js2-report-error "msg.generator.returns" name pos (- end pos))))
+    ret))
+
+(defun js2-parse-debugger ()
+  (make-js2-keyword-node :type js2-DEBUGGER))
+
+(defun js2-parse-block ()
+  "Parser for a curly-delimited statement block.
+Last token matched must be `js2-LC'."
+  (let ((pos (js2-current-token-beg))
+        (pn (make-js2-scope)))
+    (js2-push-scope pn)
+    (unwind-protect
+        (progn
+          (js2-parse-statements pn)
+          (js2-must-match js2-RC "msg.no.brace.block")
+          (setf (js2-node-len pn) (- (js2-current-token-end) pos)))
+      (js2-pop-scope))
+    pn))
+
+;; For `js2-ERROR' too, to have a node for error recovery to work on.
+(defun js2-parse-semi ()
+  "Parse a statement or handle an error.
+Current token type is `js2-SEMI' or `js2-ERROR'."
+  (let ((tt (js2-current-token-type)) pos len)
+    (if (eq tt js2-SEMI)
+        (make-js2-empty-expr-node :len 1)
+      (setq pos (js2-current-token-beg)
+            len (- (js2-current-token-end) pos))
+      (js2-report-error "msg.syntax" nil pos len)
+      (make-js2-error-node :pos pos :len len))))
+
+(defun js2-parse-default-xml-namespace ()
+  "Parse a `default xml namespace = <expr>' e4x statement."
+  (let ((pos (js2-current-token-beg))
+        end len expr unary)
+    (js2-must-have-xml)
+    (js2-set-requires-activation)
+    (setq len (- js2-ts-cursor pos))
+    (unless (and (js2-match-token js2-NAME)
+                 (string= (js2-current-token-string) "xml"))
+      (js2-report-error "msg.bad.namespace" nil pos len))
+    (unless (and (js2-match-token js2-NAME)
+                 (string= (js2-current-token-string) "namespace"))
+      (js2-report-error "msg.bad.namespace" nil pos len))
+    (unless (js2-match-token js2-ASSIGN)
+      (js2-report-error "msg.bad.namespace" nil pos len))
+    (setq expr (js2-parse-expr)
+          end (js2-node-end expr)
+          unary (make-js2-unary-node :type js2-DEFAULTNAMESPACE
+                                     :pos pos
+                                     :len (- end pos)
+                                     :operand expr))
+    (js2-node-add-children unary expr)
+    (make-js2-expr-stmt-node :pos pos
+                             :len (- end pos)
+                             :expr unary)))
+
+(defun js2-record-label (label bundle)
+  ;; current token should be colon that `js2-parse-primary-expr' left untouched
+  (js2-get-token)
+  (let ((name (js2-label-node-name label))
+        labeled-stmt
+        dup)
+    (when (setq labeled-stmt (cdr (assoc name js2-label-set)))
+      ;; flag both labels if possible when used in editing mode
+      (if (and js2-parse-ide-mode
+               (setq dup (js2-get-label-by-name labeled-stmt name)))
+          (js2-report-error "msg.dup.label" nil
+                            (js2-node-abs-pos dup) (js2-node-len dup)))
+      (js2-report-error "msg.dup.label" nil
+                        (js2-node-pos label) (js2-node-len label)))
+    (js2-labeled-stmt-node-add-label bundle label)
+    (js2-node-add-children bundle label)
+    ;; Add one reference to the bundle per label in `js2-label-set'
+    (push (cons name bundle) js2-label-set)))
+
+(defun js2-parse-name-or-label ()
+  "Parser for identifier or label.  Last token matched must be js2-NAME.
+Called when we found a name in a statement context.  If it's a label, we gather
+up any following labels and the next non-label statement into a
+`js2-labeled-stmt-node' bundle and return that.  Otherwise we parse an
+expression and return it wrapped in a `js2-expr-stmt-node'."
+  (let ((pos (js2-current-token-beg))
+        expr stmt bundle
+        (continue t))
+    ;; set check for label and call down to `js2-parse-primary-expr'
+    (setq expr (js2-maybe-parse-label))
+    (if (null expr)
+        ;; Parse the non-label expression and wrap with expression stmt.
+        (js2-wrap-with-expr-stmt pos (js2-parse-expr) t)
+      ;; else parsed a label
+      (setq bundle (make-js2-labeled-stmt-node :pos pos))
+      (js2-record-label expr bundle)
+      ;; look for more labels
+      (while (and continue (= (js2-get-token) js2-NAME))
+        (if (setq expr (js2-maybe-parse-label))
+            (js2-record-label expr bundle)
+          (setq expr (js2-parse-expr)
+                stmt (js2-wrap-with-expr-stmt (js2-node-pos expr) expr t)
+                continue nil)
+          (js2-auto-insert-semicolon stmt)))
+      ;; no more labels; now parse the labeled statement
+      (unwind-protect
+            (unless stmt
+              (let ((js2-labeled-stmt bundle))  ; bind dynamically
+                (js2-unget-token)
+                (setq stmt (js2-statement-helper))))
+        ;; remove the labels for this statement from the global set
+        (dolist (label (js2-labeled-stmt-node-labels bundle))
+          (setq js2-label-set (remove label js2-label-set))))
+      (setf (js2-labeled-stmt-node-stmt bundle) stmt
+            (js2-node-len bundle) (- (js2-node-end stmt) pos))
+      (js2-node-add-children bundle stmt)
+      bundle)))
+
+(defun js2-maybe-parse-label ()
+  (cl-assert (= (js2-current-token-type) js2-NAME))
+  (let (label-pos
+        (next-tt (js2-get-token))
+        (label-end (js2-current-token-end)))
+    ;; Do not consume colon, it is used as unwind indicator
+    ;; to return to statementHelper.
+    (js2-unget-token)
+    (if (= next-tt js2-COLON)
+        (prog2
+            (setq label-pos (js2-current-token-beg))
+            (make-js2-label-node :pos label-pos
+                                 :len (- label-end label-pos)
+                                 :name (js2-current-token-string))
+          (js2-set-face label-pos
+                        label-end
+                        'font-lock-variable-name-face 'record))
+      ;; Backtrack from the name token, too.
+      (js2-unget-token)
+      nil)))
+
+(defun js2-parse-expr-stmt ()
+  "Default parser in statement context, if no recognized statement found."
+  (js2-wrap-with-expr-stmt (js2-current-token-beg)
+                           (progn
+                             (js2-unget-token)
+                             (js2-parse-expr)) t))
+
+(defun js2-parse-variables (decl-type pos)
+  "Parse a comma-separated list of variable declarations.
+Could be a 'var', 'const' or 'let' expression, possibly in a for-loop initializer.
+
+DECL-TYPE is a token value: either VAR, CONST, or LET depending on context.
+For 'var' or 'const', the keyword should be the token last scanned.
+
+POS is the position where the node should start. It's sometimes the
+var/const/let keyword, and other times the beginning of the first token
+in the first variable declaration.
+
+Returns the parsed `js2-var-decl-node' expression node."
+  (let* ((result (make-js2-var-decl-node :decl-type decl-type
+                                         :pos pos))
+         destructuring kid-pos tt init name end nbeg nend vi
+         (continue t))
+    ;; Example:
+    ;; var foo = {a: 1, b: 2}, bar = [3, 4];
+    ;; var {b: s2, a: s1} = foo, x = 6, y, [s3, s4] = bar;
+    ;; var {a, b} = baz;
+    (while continue
+      (setq destructuring nil
+            name nil
+            tt (js2-get-token)
+            kid-pos (js2-current-token-beg)
+            end (js2-current-token-end)
+            init nil)
+      (if (or (= tt js2-LB) (= tt js2-LC))
+          ;; Destructuring assignment, e.g., var [a, b] = ...
+          (setq destructuring (js2-parse-destruct-primary-expr)
+                end (js2-node-end destructuring))
+        ;; Simple variable name
+        (js2-unget-token)
+        (when (js2-must-match-name "msg.bad.var")
+          (setq name (js2-create-name-node)
+                nbeg (js2-current-token-beg)
+                nend (js2-current-token-end)
+                end nend)
+          (js2-define-symbol decl-type (js2-current-token-string) name js2-in-for-init)))
+      (when (js2-match-token js2-ASSIGN)
+        (setq init (js2-parse-assign-expr)
+              end (js2-node-end init))
+        (js2-record-imenu-functions init name))
+      (when name
+        (js2-set-face nbeg nend (if (js2-function-node-p init)
+                                    'font-lock-function-name-face
+                                  'font-lock-variable-name-face)
+                      'record))
+      (setq vi (make-js2-var-init-node :pos kid-pos
+                                       :len (- end kid-pos)
+                                       :type decl-type))
+      (if destructuring
+          (progn
+            (if (and (null init) (not js2-in-for-init))
+                (js2-report-error "msg.destruct.assign.no.init"))
+            (js2-define-destruct-symbols destructuring
+                                         decl-type
+                                         'font-lock-variable-name-face)
+            (setf (js2-var-init-node-target vi) destructuring))
+        (setf (js2-var-init-node-target vi) name))
+      (setf (js2-var-init-node-initializer vi) init)
+      (js2-node-add-children vi name destructuring init)
+      (js2-block-node-push result vi)
+      (unless (js2-match-token js2-COMMA)
+        (setq continue nil)))
+    (setf (js2-node-len result) (- end pos))
+    result))
+
+(defun js2-parse-let (pos &optional stmt-p)
+  "Parse a let expression or statement.
+A let-expression is of the form `let (vars) expr'.
+A let-statment is of the form `let (vars) {statements}'.
+The third form of let is a variable declaration list, handled
+by `js2-parse-variables'."
+  (let ((pn (make-js2-let-node :pos pos))
+        beg vars body)
+    (if (js2-must-match js2-LP "msg.no.paren.after.let")
+        (setf (js2-let-node-lp pn) (- (js2-current-token-beg) pos)))
+    (js2-push-scope pn)
+    (unwind-protect
+        (progn
+          (setq vars (js2-parse-variables js2-LET (js2-current-token-beg)))
+          (if (js2-must-match js2-RP "msg.no.paren.let")
+              (setf (js2-let-node-rp pn) (- (js2-current-token-beg) pos)))
+          (if (and stmt-p (js2-match-token js2-LC))
+              ;; let statement
+              (progn
+                (setf beg (js2-current-token-beg)  ; position stmt at LC
+                      body (js2-parse-statements))
+                (js2-must-match js2-RC "msg.no.curly.let")
+                (setf (js2-node-len body) (- (js2-current-token-end) beg)
+                      (js2-node-len pn) (- (js2-current-token-end) pos)
+                      (js2-let-node-body pn) body
+                      (js2-node-type pn) js2-LET))
+            ;; let expression
+            (setf body (js2-parse-expr)
+                  (js2-node-len pn) (- (js2-node-end body) pos)
+                  (js2-let-node-body pn) body))
+          (setf (js2-let-node-vars pn) vars)
+          (js2-node-add-children pn vars body))
+      (js2-pop-scope))
+    pn))
+
+(defun js2-define-new-symbol (decl-type name node &optional scope)
+  (js2-scope-put-symbol (or scope js2-current-scope)
+                        name
+                        (make-js2-symbol decl-type name node)))
+
+(defun js2-define-symbol (decl-type name &optional node ignore-not-in-block)
+  "Define a symbol in the current scope.
+If NODE is non-nil, it is the AST node associated with the symbol."
+  (let* ((defining-scope (js2-get-defining-scope js2-current-scope name))
+         (symbol (if defining-scope
+                     (js2-scope-get-symbol defining-scope name)))
+         (sdt (if symbol (js2-symbol-decl-type symbol) -1))
+         (pos (if node (js2-node-abs-pos node)))
+         (len (if node (js2-node-len node))))
+    (cond
+     ((and symbol ; already defined
+           (or (= sdt js2-CONST) ; old version is const
+               (= decl-type js2-CONST) ; new version is const
+               ;; two let-bound vars in this block have same name
+               (and (= sdt js2-LET)
+                    (eq defining-scope js2-current-scope))))
+      (js2-report-error
+       (cond
+        ((= sdt js2-CONST) "msg.const.redecl")
+        ((= sdt js2-LET) "msg.let.redecl")
+        ((= sdt js2-VAR) "msg.var.redecl")
+        ((= sdt js2-FUNCTION) "msg.function.redecl")
+        (t "msg.parm.redecl"))
+       name pos len))
+     ((= decl-type js2-LET)
+      (if (and (not ignore-not-in-block)
+               (or (= (js2-node-type js2-current-scope) js2-IF)
+                   (js2-loop-node-p js2-current-scope)))
+          (js2-report-error "msg.let.decl.not.in.block")
+        (js2-define-new-symbol decl-type name node)))
+     ((or (= decl-type js2-VAR)
+          (= decl-type js2-CONST)
+          (= decl-type js2-FUNCTION))
+      (if symbol
+          (if (and js2-strict-var-redeclaration-warning (= sdt js2-VAR))
+              (js2-add-strict-warning "msg.var.redecl" name)
+            (if (and js2-strict-var-hides-function-arg-warning (= sdt js2-LP))
+                (js2-add-strict-warning "msg.var.hides.arg" name)))
+        (js2-define-new-symbol decl-type name node
+                               js2-current-script-or-fn)))
+     ((= decl-type js2-LP)
+      (if symbol
+          ;; must be duplicate parameter. Second parameter hides the
+          ;; first, so go ahead and add the second pararameter
+          (js2-report-warning "msg.dup.parms" name))
+      (js2-define-new-symbol decl-type name node))
+     (t (js2-code-bug)))))
+
+(defun js2-parse-paren-expr-or-generator-comp ()
+  (let ((px-pos (js2-current-token-beg)))
+    (if (and (>= js2-language-version 200)
+             (js2-match-token js2-FOR))
+        (js2-parse-generator-comp px-pos)
+      (let* ((js2-in-for-init nil)
+             (expr (js2-parse-expr))
+             (pn (make-js2-paren-node :pos px-pos
+                                      :expr expr
+                                      :len (- (js2-current-token-end)
+                                              px-pos))))
+        (js2-node-add-children pn (js2-paren-node-expr pn))
+        (js2-must-match js2-RP "msg.no.paren")
+        pn))))
+
+(defun js2-parse-expr (&optional oneshot)
+  (let* ((pn (js2-parse-assign-expr))
+         (pos (js2-node-pos pn))
+         left
+         right
+         op-pos)
+    (while (and (not oneshot)
+                (js2-match-token js2-COMMA))
+      (setq op-pos (- (js2-current-token-beg) pos))  ; relative
+      (if (= (js2-peek-token) js2-YIELD)
+          (js2-report-error "msg.yield.parenthesized"))
+      (setq right (js2-parse-assign-expr)
+            left pn
+            pn (make-js2-infix-node :type js2-COMMA
+                                    :pos pos
+                                    :len (- js2-ts-cursor pos)
+                                    :op-pos op-pos
+                                    :left left
+                                    :right right))
+      (js2-node-add-children pn left right))
+    pn))
+
+(defun js2-parse-assign-expr ()
+  (let ((tt (js2-get-token))
+        (pos (js2-current-token-beg))
+        pn left right op-pos
+        ts-state recorded-identifiers parsed-errors)
+    (if (= tt js2-YIELD)
+        (js2-parse-return-or-yield tt t)
+      ;; Save the tokenizer state in case we find an arrow function
+      ;; and have to rewind.
+      (setq ts-state (make-js2-ts-state)
+            recorded-identifiers js2-recorded-identifiers
+            parsed-errors js2-parsed-errors)
+      ;; not yield - parse assignment expression
+      (setq pn (js2-parse-cond-expr)
+            tt (js2-get-token))
+      (cond
+       ((and (<= js2-first-assign tt)
+             (<= tt js2-last-assign))
+        ;; tt express assignment (=, |=, ^=, ..., %=)
+        (setq op-pos (- (js2-current-token-beg) pos)  ; relative
+              left pn)
+        (setq right (js2-parse-assign-expr)
+              pn (make-js2-assign-node :type tt
+                                       :pos pos
+                                       :len (- (js2-node-end right) pos)
+                                       :op-pos op-pos
+                                       :left left
+                                       :right right))
+        (when js2-parse-ide-mode
+          (js2-highlight-assign-targets pn left right)
+          (js2-record-imenu-functions right left))
+        ;; do this last so ide checks above can use absolute positions
+        (js2-node-add-children pn left right))
+       ((and (= tt js2-ARROW)
+             (>= js2-language-version 200))
+        (js2-ts-seek ts-state)
+        (setq js2-recorded-identifiers recorded-identifiers
+              js2-parsed-errors parsed-errors)
+        (setq pn (js2-parse-function 'FUNCTION_ARROW (js2-current-token-beg) nil)))
+       (t
+        (js2-unget-token)))
+      pn)))
+
+(defun js2-parse-cond-expr ()
+  (let ((pos (js2-current-token-beg))
+        (pn (js2-parse-or-expr))
+        test-expr
+        if-true
+        if-false
+        q-pos
+        c-pos)
+    (when (js2-match-token js2-HOOK)
+      (setq q-pos (- (js2-current-token-beg) pos)
+            if-true (let (js2-in-for-init) (js2-parse-assign-expr)))
+      (js2-must-match js2-COLON "msg.no.colon.cond")
+      (setq c-pos (- (js2-current-token-beg) pos)
+            if-false (js2-parse-assign-expr)
+            test-expr pn
+            pn (make-js2-cond-node :pos pos
+                                   :len (- (js2-node-end if-false) pos)
+                                   :test-expr test-expr
+                                   :true-expr if-true
+                                   :false-expr if-false
+                                   :q-pos q-pos
+                                   :c-pos c-pos))
+      (js2-node-add-children pn test-expr if-true if-false))
+    pn))
+
+(defun js2-make-binary (type left parser)
+  "Helper for constructing a binary-operator AST node.
+LEFT is the left-side-expression, already parsed, and the
+binary operator should have just been matched.
+PARSER is a function to call to parse the right operand,
+or a `js2-node' struct if it has already been parsed.
+FIXME: The latter option is unused?"
+  (let* ((pos (js2-node-pos left))
+         (op-pos (- (js2-current-token-beg) pos))
+         (right (if (js2-node-p parser)
+                    parser
+                  (js2-get-token)
+                  (funcall parser)))
+         (pn (make-js2-infix-node :type type
+                                  :pos pos
+                                  :len (- (js2-node-end right) pos)
+                                  :op-pos op-pos
+                                  :left left
+                                  :right right)))
+    (js2-node-add-children pn left right)
+    pn))
+
+(defun js2-parse-or-expr ()
+  (let ((pn (js2-parse-and-expr)))
+    (when (js2-match-token js2-OR)
+      (setq pn (js2-make-binary js2-OR
+                                pn
+                                'js2-parse-or-expr)))
+    pn))
+
+(defun js2-parse-and-expr ()
+  (let ((pn (js2-parse-bit-or-expr)))
+    (when (js2-match-token js2-AND)
+      (setq pn (js2-make-binary js2-AND
+                                pn
+                                'js2-parse-and-expr)))
+    pn))
+
+(defun js2-parse-bit-or-expr ()
+  (let ((pn (js2-parse-bit-xor-expr)))
+    (while (js2-match-token js2-BITOR)
+      (setq pn (js2-make-binary js2-BITOR
+                                pn
+                                'js2-parse-bit-xor-expr)))
+    pn))
+
+(defun js2-parse-bit-xor-expr ()
+  (let ((pn (js2-parse-bit-and-expr)))
+    (while (js2-match-token js2-BITXOR)
+      (setq pn (js2-make-binary js2-BITXOR
+                                pn
+                                'js2-parse-bit-and-expr)))
+    pn))
+
+(defun js2-parse-bit-and-expr ()
+  (let ((pn (js2-parse-eq-expr)))
+    (while (js2-match-token js2-BITAND)
+      (setq pn (js2-make-binary js2-BITAND
+                                pn
+                                'js2-parse-eq-expr)))
+    pn))
+
+(defconst js2-parse-eq-ops
+  (list js2-EQ js2-NE js2-SHEQ js2-SHNE))
+
+(defun js2-parse-eq-expr ()
+  (let ((pn (js2-parse-rel-expr))
+        tt)
+    (while (memq (setq tt (js2-get-token)) js2-parse-eq-ops)
+      (setq pn (js2-make-binary tt
+                                pn
+                                'js2-parse-rel-expr)))
+    (js2-unget-token)
+    pn))
+
+(defconst js2-parse-rel-ops
+  (list js2-IN js2-INSTANCEOF js2-LE js2-LT js2-GE js2-GT))
+
+(defun js2-parse-rel-expr ()
+  (let ((pn (js2-parse-shift-expr))
+        (continue t)
+        tt)
+    (while continue
+      (setq tt (js2-get-token))
+      (cond
+       ((and js2-in-for-init (= tt js2-IN))
+        (js2-unget-token)
+        (setq continue nil))
+       ((memq tt js2-parse-rel-ops)
+        (setq pn (js2-make-binary tt pn 'js2-parse-shift-expr)))
+       (t
+        (js2-unget-token)
+        (setq continue nil))))
+    pn))
+
+(defconst js2-parse-shift-ops
+  (list js2-LSH js2-URSH js2-RSH))
+
+(defun js2-parse-shift-expr ()
+  (let ((pn (js2-parse-add-expr))
+        tt
+        (continue t))
+    (while continue
+      (setq tt (js2-get-token))
+      (if (memq tt js2-parse-shift-ops)
+          (setq pn (js2-make-binary tt pn 'js2-parse-add-expr))
+        (js2-unget-token)
+        (setq continue nil)))
+    pn))
+
+(defun js2-parse-add-expr ()
+  (let ((pn (js2-parse-mul-expr))
+        tt
+        (continue t))
+    (while continue
+      (setq tt (js2-get-token))
+      (if (or (= tt js2-ADD) (= tt js2-SUB))
+          (setq pn (js2-make-binary tt pn 'js2-parse-mul-expr))
+        (js2-unget-token)
+        (setq continue nil)))
+    pn))
+
+(defconst js2-parse-mul-ops
+  (list js2-MUL js2-DIV js2-MOD))
+
+(defun js2-parse-mul-expr ()
+  (let ((pn (js2-parse-unary-expr))
+        tt
+        (continue t))
+    (while continue
+      (setq tt (js2-get-token))
+      (if (memq tt js2-parse-mul-ops)
+          (setq pn (js2-make-binary tt pn 'js2-parse-unary-expr))
+        (js2-unget-token)
+        (setq continue nil)))
+    pn))
+
+(defun js2-make-unary (type parser &rest args)
+  "Make a unary node of type TYPE.
+PARSER is either a node (for postfix operators) or a function to call
+to parse the operand (for prefix operators)."
+  (let* ((pos (js2-current-token-beg))
+         (postfix (js2-node-p parser))
+         (expr (if postfix
+                   parser
+                 (apply parser args)))
+         end
+         pn)
+    (if postfix  ; e.g. i++
+        (setq pos (js2-node-pos expr)
+              end (js2-current-token-end))
+      (setq end (js2-node-end expr)))
+    (setq pn (make-js2-unary-node :type type
+                                  :pos pos
+                                  :len (- end pos)
+                                  :operand expr))
+    (js2-node-add-children pn expr)
+    pn))
+
+(defconst js2-incrementable-node-types
+  (list js2-NAME js2-GETPROP js2-GETELEM js2-GET_REF js2-CALL)
+  "Node types that can be the operand of a ++ or -- operator.")
+
+(defun js2-check-bad-inc-dec (tt beg end unary)
+  (unless (memq (js2-node-type (js2-unary-node-operand unary))
+                js2-incrementable-node-types)
+    (js2-report-error (if (= tt js2-INC)
+                          "msg.bad.incr"
+                        "msg.bad.decr")
+                      nil beg (- end beg))))
+
+(defun js2-parse-unary-expr ()
+  (let ((tt (js2-current-token-type))
+        pn expr beg end)
+    (cond
+     ((or (= tt js2-VOID)
+          (= tt js2-NOT)
+          (= tt js2-BITNOT)
+          (= tt js2-TYPEOF))
+      (js2-get-token)
+      (js2-make-unary tt 'js2-parse-unary-expr))
+     ((= tt js2-ADD)
+      (js2-get-token)
+      ;; Convert to special POS token in decompiler and parse tree
+      (js2-make-unary js2-POS 'js2-parse-unary-expr))
+     ((= tt js2-SUB)
+      (js2-get-token)
+      ;; Convert to special NEG token in decompiler and parse tree
+      (js2-make-unary js2-NEG 'js2-parse-unary-expr))
+     ((or (= tt js2-INC)
+          (= tt js2-DEC))
+      (js2-get-token)
+      (prog1
+          (setq beg (js2-current-token-beg)
+                end (js2-current-token-end)
+                expr (js2-make-unary tt 'js2-parse-member-expr t))
+        (js2-check-bad-inc-dec tt beg end expr)))
+     ((= tt js2-DELPROP)
+      (js2-get-token)
+      (js2-make-unary js2-DELPROP 'js2-parse-unary-expr))
+     ((= tt js2-ERROR)
+      (js2-get-token)
+      (make-js2-error-node))  ; try to continue
+     ((and (= tt js2-LT)
+           js2-compiler-xml-available)
+      ;; XML stream encountered in expression.
+      (js2-parse-member-expr-tail t (js2-parse-xml-initializer)))
+     (t
+      (setq pn (js2-parse-member-expr t)
+            ;; Don't look across a newline boundary for a postfix incop.
+            tt (js2-peek-token-or-eol))
+      (when (or (= tt js2-INC) (= tt js2-DEC))
+        (js2-get-token)
+        (setf expr pn
+              pn (js2-make-unary tt expr))
+        (js2-node-set-prop pn 'postfix t)
+        (js2-check-bad-inc-dec tt (js2-current-token-beg) (js2-current-token-end) pn))
+      pn))))
+
+(defun js2-parse-xml-initializer ()
+  "Parse an E4X XML initializer.
+I'm parsing it the way Rhino parses it, but without the tree-rewriting.
+Then I'll postprocess the result, depending on whether we're in IDE
+mode or codegen mode, and generate the appropriate rewritten AST.
+IDE mode uses a rich AST that models the XML structure.  Codegen mode
+just concatenates everything and makes a new XML or XMLList out of it."
+  (let ((tt (js2-get-first-xml-token))
+        pn-xml pn expr kids expr-pos
+        (continue t)
+        (first-token t))
+    (when (not (or (= tt js2-XML) (= tt js2-XMLEND)))
+      (js2-report-error "msg.syntax"))
+    (setq pn-xml (make-js2-xml-node))
+    (while continue
+      (if first-token
+          (setq first-token nil)
+        (setq tt (js2-get-next-xml-token)))
+      (cond
+       ;; js2-XML means we found a {expr} in the XML stream.
+       ;; The token string is the XML up to the left-curly.
+       ((= tt js2-XML)
+        (push (make-js2-string-node :pos (js2-current-token-beg)
+                                    :len (- js2-ts-cursor (js2-current-token-beg)))
+              kids)
+        (js2-must-match js2-LC "msg.syntax")
+        (setq expr-pos js2-ts-cursor
+              expr (if (eq (js2-peek-token) js2-RC)
+                       (make-js2-empty-expr-node :pos expr-pos)
+                     (js2-parse-expr)))
+        (js2-must-match js2-RC "msg.syntax")
+        (setq pn (make-js2-xml-js-expr-node :pos (js2-node-pos expr)
+                                            :len (js2-node-len expr)
+                                            :expr expr))
+        (js2-node-add-children pn expr)
+        (push pn kids))
+       ;; a js2-XMLEND token means we hit the final close-tag.
+       ((= tt js2-XMLEND)
+        (push (make-js2-string-node :pos (js2-current-token-beg)
+                                    :len (- js2-ts-cursor (js2-current-token-beg)))
+              kids)
+        (dolist (kid (nreverse kids))
+          (js2-block-node-push pn-xml kid))
+        (setf (js2-node-len pn-xml) (- js2-ts-cursor
+                                       (js2-node-pos pn-xml))
+              continue nil))
+       (t
+        (js2-report-error "msg.syntax")
+        (setq continue nil))))
+    pn-xml))
+
+
+(defun js2-parse-argument-list ()
+  "Parse an argument list and return it as a Lisp list of nodes.
+Returns the list in reverse order.  Consumes the right-paren token."
+  (let (result)
+    (unless (js2-match-token js2-RP)
+      (cl-loop do
+               (let ((tt (js2-get-token)))
+                 (if (= tt js2-YIELD)
+                     (js2-report-error "msg.yield.parenthesized"))
+                 (if (and (= tt js2-TRIPLEDOT)
+                          (>= js2-language-version 200))
+                     (push (js2-make-unary tt 'js2-parse-assign-expr) result)
+                   (js2-unget-token)
+                   (push (js2-parse-assign-expr) result)))
+               while
+               (js2-match-token js2-COMMA))
+      (js2-must-match js2-RP "msg.no.paren.arg")
+      result)))
+
+(defun js2-parse-member-expr (&optional allow-call-syntax)
+  (let ((tt (js2-current-token-type))
+        pn pos target args beg end init)
+    (if (/= tt js2-NEW)
+        (setq pn (js2-parse-primary-expr))
+      ;; parse a 'new' expression
+      (js2-get-token)
+      (setq pos (js2-current-token-beg)
+            beg pos
+            target (js2-parse-member-expr)
+            end (js2-node-end target)
+            pn (make-js2-new-node :pos pos
+                                  :target target
+                                  :len (- end pos)))
+      (js2-highlight-function-call (js2-current-token))
+      (js2-node-add-children pn target)
+      (when (js2-match-token js2-LP)
+        ;; Add the arguments to pn, if any are supplied.
+        (setf beg pos  ; start of "new" keyword
+              pos (js2-current-token-beg)
+              args (nreverse (js2-parse-argument-list))
+              (js2-new-node-args pn) args
+              end (js2-current-token-end)
+              (js2-new-node-lp pn) (- pos beg)
+              (js2-new-node-rp pn) (- end 1 beg))
+        (apply #'js2-node-add-children pn args))
+      (when (and js2-allow-rhino-new-expr-initializer
+                 (js2-match-token js2-LC))
+        (setf init (js2-parse-object-literal)
+              end (js2-node-end init)
+              (js2-new-node-initializer pn) init)
+        (js2-node-add-children pn init))
+        (setf (js2-node-len pn) (- end beg)))  ; end outer if
+    (js2-parse-member-expr-tail allow-call-syntax pn)))
+
+(defun js2-parse-member-expr-tail (allow-call-syntax pn)
+  "Parse a chain of property/array accesses or function calls.
+Includes parsing for E4X operators like `..' and `.@'.
+If ALLOW-CALL-SYNTAX is nil, stops when we encounter a left-paren.
+Returns an expression tree that includes PN, the parent node."
+  (let (tt
+        (continue t))
+    (while continue
+      (setq tt (js2-get-token))
+      (cond
+       ((or (= tt js2-DOT) (= tt js2-DOTDOT))
+        (setq pn (js2-parse-property-access tt pn)))
+       ((= tt js2-DOTQUERY)
+        (setq pn (js2-parse-dot-query pn)))
+       ((= tt js2-LB)
+        (setq pn (js2-parse-element-get pn)))
+       ((= tt js2-LP)
+        (js2-unget-token)
+        (if allow-call-syntax
+            (setq pn (js2-parse-function-call pn))
+          (setq continue nil)))
+       ((= tt js2-TEMPLATE_HEAD)
+        (setq pn (js2-parse-tagged-template pn (js2-parse-template-literal))))
+       ((= tt js2-NO_SUBS_TEMPLATE)
+        (setq pn (js2-parse-tagged-template pn (make-js2-string-node :type tt))))
+       (t
+        (js2-unget-token)
+        (setq continue nil))))
+    (if (>= js2-highlight-level 2)
+        (js2-parse-highlight-member-expr-node pn))
+    pn))
+
+(defun js2-parse-tagged-template (tag-node tpl-node)
+  "Parse tagged template expression."
+  (let* ((beg (js2-node-pos tag-node))
+         (pn (make-js2-tagged-template-node :beg beg
+                                            :len (- (js2-current-token-end) beg)
+                                            :tag tag-node
+                                            :template tpl-node)))
+    (js2-node-add-children pn tag-node tpl-node)
+    pn))
+
+(defun js2-parse-dot-query (pn)
+  "Parse a dot-query expression, e.g. foo.bar.(@name == 2)
+Last token parsed must be `js2-DOTQUERY'."
+  (let ((pos (js2-node-pos pn))
+        op-pos expr end)
+    (js2-must-have-xml)
+    (js2-set-requires-activation)
+    (setq op-pos (js2-current-token-beg)
+          expr (js2-parse-expr)
+          end (js2-node-end expr)
+          pn (make-js2-xml-dot-query-node :left pn
+                                          :pos pos
+                                          :op-pos op-pos
+                                          :right expr))
+    (js2-node-add-children pn
+                           (js2-xml-dot-query-node-left pn)
+                           (js2-xml-dot-query-node-right pn))
+    (if (js2-must-match js2-RP "msg.no.paren")
+        (setf (js2-xml-dot-query-node-rp pn) (js2-current-token-beg)
+              end (js2-current-token-end)))
+    (setf (js2-node-len pn) (- end pos))
+    pn))
+
+(defun js2-parse-element-get (pn)
+  "Parse an element-get expression, e.g. foo[bar].
+Last token parsed must be `js2-RB'."
+  (let ((lb (js2-current-token-beg))
+        (pos (js2-node-pos pn))
+        rb expr)
+    (setq expr (js2-parse-expr))
+    (if (js2-must-match js2-RB "msg.no.bracket.index")
+        (setq rb (js2-current-token-beg)))
+    (setq pn (make-js2-elem-get-node :target pn
+                                     :pos pos
+                                     :element expr
+                                     :lb (js2-relpos lb pos)
+                                     :rb (js2-relpos rb pos)
+                                     :len (- (js2-current-token-end) pos)))
+    (js2-node-add-children pn
+                           (js2-elem-get-node-target pn)
+                           (js2-elem-get-node-element pn))
+    pn))
+
+(defun js2-highlight-function-call (token)
+  (when (eq (js2-token-type token) js2-NAME)
+    (js2-record-face 'js2-function-call token)))
+
+(defun js2-parse-function-call (pn)
+  (js2-highlight-function-call (js2-current-token))
+  (js2-get-token)
+  (let (args
+        (pos (js2-node-pos pn)))
+    (setq pn (make-js2-call-node :pos pos
+                                 :target pn
+                                 :lp (- (js2-current-token-beg) pos)))
+    (js2-node-add-children pn (js2-call-node-target pn))
+    ;; Add the arguments to pn, if any are supplied.
+    (setf args (nreverse (js2-parse-argument-list))
+          (js2-call-node-rp pn) (- (js2-current-token-beg) pos)
+          (js2-call-node-args pn) args)
+    (apply #'js2-node-add-children pn args)
+    (setf (js2-node-len pn) (- js2-ts-cursor pos))
+    pn))
+
+(defun js2-parse-property-access (tt pn)
+  "Parse a property access, XML descendants access, or XML attr access."
+  (let ((member-type-flags 0)
+        (dot-pos (js2-current-token-beg))
+        (dot-len (if (= tt js2-DOTDOT) 2 1))
+        name
+        ref  ; right side of . or .. operator
+        result)
+    (when (= tt js2-DOTDOT)
+      (js2-must-have-xml)
+      (setq member-type-flags js2-descendants-flag))
+    (if (not js2-compiler-xml-available)
+        (progn
+          (js2-must-match-prop-name "msg.no.name.after.dot")
+          (setq name (js2-create-name-node t js2-GETPROP)
+                result (make-js2-prop-get-node :left pn
+                                               :pos (js2-current-token-beg)
+                                               :right name
+                                               :len (js2-current-token-len)))
+          (js2-node-add-children result pn name)
+          result)
+      ;; otherwise look for XML operators
+      (setf result (if (= tt js2-DOT)
+                       (make-js2-prop-get-node)
+                     (make-js2-infix-node :type js2-DOTDOT))
+            (js2-node-pos result) (js2-node-pos pn)
+            (js2-infix-node-op-pos result) dot-pos
+            (js2-infix-node-left result) pn  ; do this after setting position
+            tt (js2-get-prop-name-token))
+      (cond
+       ;; handles: name, ns::name, ns::*, ns::[expr]
+       ((= tt js2-NAME)
+        (setq ref (js2-parse-property-name -1 nil member-type-flags)))
+       ;; handles: *, *::name, *::*, *::[expr]
+       ((= tt js2-MUL)
+        (setq ref (js2-parse-property-name nil "*" member-type-flags)))
+       ;; handles: '@attr', '@ns::attr', '@ns::*', '@ns::[expr]', etc.
+       ((= tt js2-XMLATTR)
+        (setq result (js2-parse-attribute-access)))
+       (t
+        (js2-report-error "msg.no.name.after.dot" nil dot-pos dot-len)))
+      (if ref
+          (setf (js2-node-len result) (- (js2-node-end ref)
+                                         (js2-node-pos result))
+                (js2-infix-node-right result) ref))
+      (if (js2-infix-node-p result)
+          (js2-node-add-children result
+                                 (js2-infix-node-left result)
+                                 (js2-infix-node-right result)))
+      result)))
+
+(defun js2-parse-attribute-access ()
+  "Parse an E4X XML attribute expression.
+This includes expressions of the forms:
+
+  @attr      @ns::attr     @ns::*
+  @*         @*::attr      @*::*
+  @[expr]    @*::[expr]    @ns::[expr]
+
+Called if we peeked an '@' token."
+  (let ((tt (js2-get-prop-name-token))
+        (at-pos (js2-current-token-beg)))
+    (cond
+     ;; handles: @name, @ns::name, @ns::*, @ns::[expr]
+     ((= tt js2-NAME)
+      (js2-parse-property-name at-pos nil 0))
+     ;; handles: @*, @*::name, @*::*, @*::[expr]
+     ((= tt js2-MUL)
+      (js2-parse-property-name (js2-current-token-beg) "*" 0))
+     ;; handles @[expr]
+     ((= tt js2-LB)
+      (js2-parse-xml-elem-ref at-pos))
+     (t
+      (js2-report-error "msg.no.name.after.xmlAttr")
+      ;; Avoid cascaded errors that happen if we make an error node here.
+      (js2-parse-property-name (js2-current-token-beg) "" 0)))))
+
+(defun js2-parse-property-name (at-pos s member-type-flags)
+  "Check if :: follows name in which case it becomes qualified name.
+
+AT-POS is a natural number if we just read an '@' token, else nil.
+S is the name or string that was matched:  an identifier, 'throw' or '*'.
+MEMBER-TYPE-FLAGS is a bit set tracking whether we're a '.' or '..' child.
+
+Returns a `js2-xml-ref-node' if it's an attribute access, a child of a '..'
+operator, or the name is followed by ::.  For a plain name, returns a
+`js2-name-node'.  Returns a `js2-error-node' for malformed XML expressions."
+  (let ((pos (or at-pos (js2-current-token-beg)))
+        colon-pos
+        (name (js2-create-name-node t (js2-current-token-type) s))
+        ns tt pn)
+    (catch 'return
+      (when (js2-match-token js2-COLONCOLON)
+        (setq ns name
+              colon-pos (js2-current-token-beg)
+              tt (js2-get-prop-name-token))
+        (cond
+         ;; handles name::name
+         ((= tt js2-NAME)
+          (setq name (js2-create-name-node)))
+         ;; handles name::*
+         ((= tt js2-MUL)
+          (setq name (js2-create-name-node nil nil "*")))
+         ;; handles name::[expr]
+         ((= tt js2-LB)
+          (throw 'return (js2-parse-xml-elem-ref at-pos ns colon-pos)))
+         (t
+          (js2-report-error "msg.no.name.after.coloncolon"))))
+      (if (and (null ns) (zerop member-type-flags))
+          name
+        (prog1
+            (setq pn
+                  (make-js2-xml-prop-ref-node :pos pos
+                                              :len (- (js2-node-end name) pos)
+                                              :at-pos at-pos
+                                              :colon-pos colon-pos
+                                              :propname name))
+          (js2-node-add-children pn name))))))
+
+(defun js2-parse-xml-elem-ref (at-pos &optional namespace colon-pos)
+  "Parse the [expr] portion of an xml element reference.
+For instance, @[expr], @*::[expr], or ns::[expr]."
+  (let* ((lb (js2-current-token-beg))
+         (pos (or at-pos lb))
+         rb
+         (expr (js2-parse-expr))
+         (end (js2-node-end expr))
+         pn)
+    (if (js2-must-match js2-RB "msg.no.bracket.index")
+        (setq rb (js2-current-token-beg)
+              end (js2-current-token-end)))
+    (prog1
+        (setq pn
+              (make-js2-xml-elem-ref-node :pos pos
+                                          :len (- end pos)
+                                          :namespace namespace
+                                          :colon-pos colon-pos
+                                          :at-pos at-pos
+                                          :expr expr
+                                          :lb (js2-relpos lb pos)
+                                          :rb (js2-relpos rb pos)))
+      (js2-node-add-children pn namespace expr))))
+
+(defun js2-parse-destruct-primary-expr ()
+  (let ((js2-is-in-destructuring t))
+    (js2-parse-primary-expr)))
+
+(defun js2-parse-primary-expr ()
+  "Parse a literal (leaf) expression of some sort.
+Includes complex literals such as functions, object-literals,
+array-literals, array comprehensions and regular expressions."
+  (let (pn      ; parent node  (usually return value)
+        tt)
+    (setq tt (js2-current-token-type))
+    (cond
+     ((= tt js2-CLASS)
+      (js2-parse-class-expr))
+     ((= tt js2-FUNCTION)
+      (js2-parse-function-expr))
+     ((= tt js2-LB)
+      (js2-parse-array-comp-or-literal))
+     ((= tt js2-LC)
+      (js2-parse-object-literal))
+     ((= tt js2-LET)
+      (js2-parse-let (js2-current-token-beg)))
+     ((= tt js2-LP)
+      (js2-parse-paren-expr-or-generator-comp))
+     ((= tt js2-XMLATTR)
+      (js2-must-have-xml)
+      (js2-parse-attribute-access))
+     ((= tt js2-NAME)
+      (js2-parse-name tt))
+     ((= tt js2-NUMBER)
+      (make-js2-number-node))
+     ((or (= tt js2-STRING) (= tt js2-NO_SUBS_TEMPLATE))
+      (make-js2-string-node :type tt))
+     ((= tt js2-TEMPLATE_HEAD)
+      (js2-parse-template-literal))
+     ((or (= tt js2-DIV) (= tt js2-ASSIGN_DIV))
+      ;; Got / or /= which in this context means a regexp literal
+      (let ((px-pos (js2-current-token-beg))
+            (flags (js2-read-regexp tt))
+            (end (js2-current-token-end)))
+        (prog1
+            (make-js2-regexp-node :pos px-pos
+                                  :len (- end px-pos)
+                                  :value (js2-current-token-string)
+                                  :flags flags)
+          (js2-set-face px-pos end 'font-lock-string-face 'record)
+          (js2-record-text-property px-pos end 'syntax-table '(2)))))
+     ((or (= tt js2-NULL)
+          (= tt js2-THIS)
+          (= tt js2-SUPER)
+          (= tt js2-FALSE)
+          (= tt js2-TRUE))
+      (make-js2-keyword-node :type tt))
+     ((= tt js2-RP)
+      ;; Not valid expression syntax, but this is valid in an arrow
+      ;; function with no params: () => body.
+      (if (eq (js2-peek-token) js2-ARROW)
+          (progn
+            (js2-unget-token)  ; Put back the right paren.
+            ;; Return whatever, it will hopefully be rewinded and
+            ;; reparsed when we reach the =>.
+            (make-js2-keyword-node :type js2-NULL))
+        (js2-report-error "msg.syntax")
+        (make-js2-error-node)))
+     ((= tt js2-TRIPLEDOT)
+      ;; Likewise, only valid in an arrow function with a rest param.
+      (if (and (js2-match-token js2-NAME)
+               (js2-match-token js2-RP)
+               (eq (js2-peek-token) js2-ARROW))
+          (progn
+            (js2-unget-token)  ; Put back the right paren.
+            ;; See the previous case.
+            (make-js2-keyword-node :type js2-NULL))
+        (js2-report-error "msg.syntax")
+        (make-js2-error-node)))
+     ((= tt js2-RESERVED)
+      (js2-report-error "msg.reserved.id")
+      (make-js2-name-node))
+     ((= tt js2-ERROR)
+      ;; the scanner or one of its subroutines reported the error.
+      (make-js2-error-node))
+     ((= tt js2-EOF)
+      (let* ((px-pos (point-at-bol))
+             (len (- js2-ts-cursor px-pos)))
+        (js2-report-error "msg.unexpected.eof" nil px-pos len))
+      (make-js2-error-node :pos (1- js2-ts-cursor)))
+     (t
+      (js2-report-error "msg.syntax")
+      (make-js2-error-node)))))
+
+(defun js2-parse-template-literal ()
+  (let ((beg (js2-current-token-beg))
+        (kids (list (make-js2-string-node :type js2-TEMPLATE_HEAD)))
+        (tt js2-TEMPLATE_HEAD))
+    (while (eq tt js2-TEMPLATE_HEAD)
+      (push (js2-parse-expr) kids)
+      (js2-must-match js2-RC "msg.syntax")
+      (setq tt (js2-get-token 'TEMPLATE_TAIL))
+      (push (make-js2-string-node :type tt) kids))
+    (setq kids (nreverse kids))
+    (let ((tpl (make-js2-template-node :beg beg
+                                       :len (- (js2-current-token-end) beg)
+                                       :kids kids)))
+      (apply #'js2-node-add-children tpl kids)
+      tpl)))
+
+(defun js2-parse-name (_tt)
+  (let ((name (js2-current-token-string))
+        node)
+    (setq node (if js2-compiler-xml-available
+                   (js2-parse-property-name nil name 0)
+                 (js2-create-name-node 'check-activation nil name)))
+    (if js2-highlight-external-variables
+        (js2-record-name-node node))
+    node))
+
+(defun js2-parse-warn-trailing-comma (msg pos elems comma-pos)
+  (js2-add-strict-warning
+   msg nil
+   ;; back up from comma to beginning of line or array/objlit
+   (max (if elems
+            (js2-node-pos (car elems))
+          pos)
+        (save-excursion
+          (goto-char comma-pos)
+          (back-to-indentation)
+          (point)))
+   comma-pos))
+
+(defun js2-parse-array-comp-or-literal ()
+  (let ((pos (js2-current-token-beg)))
+    (if (and (>= js2-language-version 200)
+             (js2-match-token js2-FOR))
+        (js2-parse-array-comp pos)
+      (js2-parse-array-literal pos))))
+
+(defun js2-parse-array-literal (pos)
+  (let ((after-lb-or-comma t)
+        after-comma tt elems pn
+        (continue t))
+    (unless js2-is-in-destructuring
+      (js2-push-scope (make-js2-scope))) ; for the legacy array comp
+    (while continue
+      (setq tt (js2-get-token))
+      (cond
+       ;; comma
+       ((= tt js2-COMMA)
+        (setq after-comma (js2-current-token-end))
+        (if (not after-lb-or-comma)
+            (setq after-lb-or-comma t)
+          (push nil elems)))
+       ;; end of array
+       ((or (= tt js2-RB)
+            (= tt js2-EOF))  ; prevent infinite loop
+        (if (= tt js2-EOF)
+            (js2-report-error "msg.no.bracket.arg" nil pos))
+        (when (and after-comma (< js2-language-version 170))
+          (js2-parse-warn-trailing-comma "msg.array.trailing.comma"
+                                         pos (remove nil elems) after-comma))
+        (setq continue nil
+              pn (make-js2-array-node :pos pos
+                                      :len (- js2-ts-cursor pos)
+                                      :elems (nreverse elems)))
+        (apply #'js2-node-add-children pn (js2-array-node-elems pn)))
+       ;; destructuring binding
+       (js2-is-in-destructuring
+        (push (if (or (= tt js2-LC)
+                      (= tt js2-LB)
+                      (= tt js2-NAME))
+                  ;; [a, b, c] | {a, b, c} | {a:x, b:y, c:z} | a
+                  (js2-parse-destruct-primary-expr)
+                ;; invalid pattern
+                (js2-report-error "msg.bad.var")
+                (make-js2-error-node))
+              elems)
+        (setq after-lb-or-comma nil
+              after-comma nil))
+       ;; array comp
+       ((and (>= js2-language-version 170)
+             (= tt js2-FOR)          ; check for array comprehension
+             (not after-lb-or-comma) ; "for" can't follow a comma
+             elems                   ; must have at least 1 element
+             (not (cdr elems)))      ; but no 2nd element
+        (js2-unget-token)
+        (setf continue nil
+              pn (js2-parse-legacy-array-comp (car elems) pos)))
+       ;; another element
+       (t
+        (unless after-lb-or-comma
+          (js2-report-error "msg.no.bracket.arg"))
+        (if (and (= tt js2-TRIPLEDOT)
+                 (>= js2-language-version 200))
+            ;; spread operator
+            (push (js2-make-unary tt 'js2-parse-assign-expr)
+                  elems)
+          (js2-unget-token)
+          (push (js2-parse-assign-expr) elems))
+        (setq after-lb-or-comma nil
+              after-comma nil))))
+    (unless js2-is-in-destructuring
+      (js2-pop-scope))
+    pn))
+
+(defun js2-parse-legacy-array-comp (expr pos)
+  "Parse a legacy array comprehension (JavaScript 1.7).
+EXPR is the first expression after the opening left-bracket.
+POS is the beginning of the LB token preceding EXPR.
+We should have just parsed the 'for' keyword before calling this function."
+  (let ((current-scope js2-current-scope)
+        loops first filter result)
+    (unwind-protect
+        (progn
+          (while (js2-match-token js2-FOR)
+            (let ((loop (make-js2-comp-loop-node)))
+              (js2-push-scope loop)
+              (push loop loops)
+              (js2-parse-comp-loop loop)))
+          ;; First loop takes expr scope's parent.
+          (setf (js2-scope-parent-scope (setq first (car (last loops))))
+                (js2-scope-parent-scope current-scope))
+          ;; Set expr scope's parent to the last loop.
+          (setf (js2-scope-parent-scope current-scope) (car loops))
+          (if (/= (js2-get-token) js2-IF)
+              (js2-unget-token)
+            (setq filter (js2-parse-condition))))
+      (dotimes (_ (1- (length loops)))
+        (js2-pop-scope)))
+    (js2-must-match js2-RB "msg.no.bracket.arg" pos)
+    (setq result (make-js2-comp-node :pos pos
+                                     :len (- js2-ts-cursor pos)
+                                     :result expr
+                                     :loops (nreverse loops)
+                                     :filters (and filter (list (car filter)))
+                                     :form 'LEGACY_ARRAY))
+    (apply #'js2-node-add-children result expr (car filter)
+           (js2-comp-node-loops result))
+    result))
+
+(defun js2-parse-array-comp (pos)
+  "Parse an ES6 array comprehension.
+POS is the beginning of the LB token.
+We should have just parsed the 'for' keyword before calling this function."
+  (let ((pn (js2-parse-comprehension pos 'ARRAY)))
+    (js2-must-match js2-RB "msg.no.bracket.arg" pos)
+    pn))
+
+(defun js2-parse-generator-comp (pos)
+  (let* ((js2-nesting-of-function (1+ js2-nesting-of-function))
+         (js2-current-script-or-fn
+          (make-js2-function-node :generator-type 'COMPREHENSION))
+         (pn (js2-parse-comprehension pos 'STAR_GENERATOR)))
+    (js2-must-match js2-RP "msg.no.paren" pos)
+    pn))
+
+(defun js2-parse-comprehension (pos form)
+  (let (loops filters expr result)
+    (unwind-protect
+        (progn
+          (js2-unget-token)
+          (while (js2-match-token js2-FOR)
+            (let ((loop (make-js2-comp-loop-node)))
+              (js2-push-scope loop)
+              (push loop loops)
+              (js2-parse-comp-loop loop)))
+          (while (js2-match-token js2-IF)
+            (push (car (js2-parse-condition)) filters))
+          (setq expr (js2-parse-assign-expr)))
+      (dolist (_ loops)
+        (js2-pop-scope)))
+    (setq result (make-js2-comp-node :pos pos
+                                     :len (- js2-ts-cursor pos)
+                                     :result expr
+                                     :loops (nreverse loops)
+                                     :filters (nreverse filters)
+                                     :form form))
+    (apply #'js2-node-add-children result (js2-comp-node-loops result))
+    (apply #'js2-node-add-children result expr (js2-comp-node-filters result))
+    result))
+
+(defun js2-parse-comp-loop (pn &optional only-of-p)
+  "Parse a 'for [each] (foo [in|of] bar)' expression in an Array comprehension.
+The current token should be the initial FOR.
+If ONLY-OF-P is non-nil, only the 'for (foo of bar)' form is allowed."
+  (let ((pos (js2-comp-loop-node-pos pn))
+        tt iter obj foreach-p forof-p in-pos each-pos lp rp)
+    (when (and (not only-of-p) (js2-match-token js2-NAME))
+      (if (string= (js2-current-token-string) "each")
+          (progn
+            (setq foreach-p t
+                  each-pos (- (js2-current-token-beg) pos)) ; relative
+            (js2-record-face 'font-lock-keyword-face))
+        (js2-report-error "msg.no.paren.for")))
+    (if (js2-must-match js2-LP "msg.no.paren.for")
+        (setq lp (- (js2-current-token-beg) pos)))
+    (setq tt (js2-peek-token))
+    (cond
+     ((or (= tt js2-LB)
+          (= tt js2-LC))
+      (js2-get-token)
+      (setq iter (js2-parse-destruct-primary-expr))
+      (js2-define-destruct-symbols iter js2-LET
+                                   'font-lock-variable-name-face t))
+     ((js2-match-token js2-NAME)
+      (setq iter (js2-create-name-node)))
+     (t
+      (js2-report-error "msg.bad.var")))
+    ;; Define as a let since we want the scope of the variable to
+    ;; be restricted to the array comprehension
+    (if (js2-name-node-p iter)
+        (js2-define-symbol js2-LET (js2-name-node-name iter) pn t))
+    (if (or (and (not only-of-p) (js2-match-token js2-IN))
+            (and (>= js2-language-version 200)
+                 (js2-match-contextual-kwd "of")
+                 (setq forof-p t)))
+        (setq in-pos (- (js2-current-token-beg) pos))
+      (js2-report-error "msg.in.after.for.name"))
+    (setq obj (js2-parse-expr))
+    (if (js2-must-match js2-RP "msg.no.paren.for.ctrl")
+        (setq rp (- (js2-current-token-beg) pos)))
+    (setf (js2-node-pos pn) pos
+          (js2-node-len pn) (- js2-ts-cursor pos)
+          (js2-comp-loop-node-iterator pn) iter
+          (js2-comp-loop-node-object pn) obj
+          (js2-comp-loop-node-in-pos pn) in-pos
+          (js2-comp-loop-node-each-pos pn) each-pos
+          (js2-comp-loop-node-foreach-p pn) foreach-p
+          (js2-comp-loop-node-forof-p pn) forof-p
+          (js2-comp-loop-node-lp pn) lp
+          (js2-comp-loop-node-rp pn) rp)
+    (js2-node-add-children pn iter obj)
+    pn))
+
+(defun js2-parse-class-stmt ()
+  (let ((pos (js2-current-token-beg)))
+    (js2-must-match-name "msg.unnamed.class.stmt")
+    (js2-parse-class pos 'CLASS_STATEMENT (js2-create-name-node t))))
+
+(defun js2-parse-class-expr ()
+  (let ((pos (js2-current-token-beg))
+        name)
+    (when (js2-match-token js2-NAME)
+      (setq name (js2-create-name-node t)))
+    (js2-parse-class pos 'CLASS_EXPRESSION name)))
+
+(defun js2-parse-class (pos form name)
+  ;; class X [extends ...] {
+  (let (pn elems extends)
+    (when name
+      (js2-set-face (js2-node-pos name) (js2-node-end name)
+                    'font-lock-function-name-face 'record))
+    (if (js2-match-token js2-EXTENDS)
+        (if (= (js2-peek-token) js2-LC)
+            (js2-report-error "msg.missing.extends")
+          ;; TODO(sdh): this should be left-hand-side-expr, not assign-expr
+          (setq extends (js2-parse-assign-expr))
+          (if (not extends)
+              (js2-report-error "msg.bad.extends"))))
+    (js2-must-match js2-LC "msg.no.brace.class")
+    (setq elems (js2-parse-object-literal-elems t)
+          pn (make-js2-class-node :pos pos
+                                  :len (- js2-ts-cursor pos)
+                                  :form form
+                                  :name name
+                                  :extends extends
+                                  :elems elems))
+    (apply #'js2-node-add-children pn (js2-class-node-elems pn))
+    pn))
+
+(defun js2-parse-object-literal ()
+  (let* ((pos (js2-current-token-beg))
+         (elems (js2-parse-object-literal-elems))
+         (result (make-js2-object-node :pos pos
+                                       :len (- js2-ts-cursor pos)
+                                       :elems elems)))
+    (apply #'js2-node-add-children result (js2-object-node-elems result))
+    result))
+
+(defun js2-parse-object-literal-elems (&optional class-p)
+  (let ((pos (js2-current-token-beg))
+        (static nil)
+        (continue t)
+        tt elems elem after-comma)
+    (while continue
+      (setq static (and class-p (js2-match-token js2-STATIC))
+            tt (js2-get-prop-name-token)
+            elem nil)
+      (cond
+       ;; {foo: ...}, {'foo': ...}, {foo, bar, ...},
+       ;; {get foo() {...}}, {set foo(x) {...}}, or {foo(x) {...}}
+       ;; TODO(sdh): support *foo() {...}
+       ((or (= js2-NAME tt)
+            (= tt js2-STRING))
+        (setq after-comma nil
+              elem (js2-parse-named-prop tt))
+        (if (and (null elem)
+                 (not js2-recover-from-parse-errors))
+            (setq continue nil)))
+       ;; {[Symbol.iterator]: ...}
+       ((and (= tt js2-LB)
+             (>= js2-language-version 200))
+        (let ((expr (js2-parse-expr)))
+          (js2-must-match js2-RB "msg.missing.computed.rb")
+          (setq after-comma nil
+                elem (js2-parse-plain-property expr))))
+       ;; {12: x} or {10.7: x}
+       ((= tt js2-NUMBER)
+        (setq after-comma nil
+              elem (js2-parse-plain-property (make-js2-number-node))))
+       ;; Break out of loop, and handle trailing commas.
+       ((or (= tt js2-RC)
+            (= tt js2-EOF))
+        (js2-unget-token)
+        (setq continue nil)
+        (if after-comma
+            (js2-parse-warn-trailing-comma "msg.extra.trailing.comma"
+                                           pos elems after-comma)))
+       (t
+        (js2-report-error "msg.bad.prop")
+        (unless js2-recover-from-parse-errors
+          (setq continue nil))))         ; end switch
+      ;; Handle static for classes' codegen.
+      (if static
+          (if elem (js2-node-set-prop elem 'STATIC t)
+            (js2-report-error "msg.unexpected.static")))
+      ;; Handle commas, depending on class-p.
+      (let ((comma (js2-match-token js2-COMMA)))
+        (if class-p
+            (if comma
+                (js2-report-error "msg.class.unexpected.comma"))
+          (if comma
+              (setq after-comma (js2-current-token-end))
+            (setq continue nil))))
+      ;; Append any parsed element.
+      (if elem (push elem elems)))       ; end loop
+    (js2-must-match js2-RC "msg.no.brace.prop")
+    (nreverse elems)))
+
+(defun js2-parse-named-prop (tt)
+  "Parse a name, string, or getter/setter object property.
+When `js2-is-in-destructuring' is t, forms like {a, b, c} will be permitted."
+  (let ((string-prop (and (= tt js2-STRING)
+                          (make-js2-string-node)))
+        expr
+        (ppos (js2-current-token-beg))
+        (pend (js2-current-token-end))
+        (name (js2-create-name-node))
+        (prop (js2-current-token-string)))
+    (cond
+     ;; getter/setter prop
+     ((and (= tt js2-NAME)
+           (= (js2-peek-token) js2-NAME)
+           (or (string= prop "get")
+               (string= prop "set")))
+      (js2-get-token)
+      (js2-set-face ppos pend 'font-lock-keyword-face 'record)  ; get/set
+      (js2-record-face 'font-lock-function-name-face)      ; for peeked name
+      (setq name (js2-create-name-node)) ; discard get/set & use peeked name
+      (js2-parse-getter-setter-prop ppos name prop))
+     ;; method definition: {f() {...}}
+     ((and (= (js2-peek-token) js2-LP)
+           (>= js2-language-version 200))
+      (js2-record-face 'font-lock-function-name-face)      ; name
+      (js2-parse-getter-setter-prop ppos name ""))
+     ;; regular prop
+     (t
+      (prog1
+          (setq expr (js2-parse-plain-property (or string-prop name)))
+        (when (and (not string-prop)
+                   (not js2-is-in-destructuring)
+                   js2-highlight-external-variables
+                   (js2-node-get-prop expr 'SHORTHAND))
+          (js2-record-name-node name))
+        (js2-set-face ppos pend
+                      (if (js2-function-node-p
+                           (js2-object-prop-node-right expr))
+                          'font-lock-function-name-face
+                        'font-lock-variable-name-face)
+                      'record))))))
+
+(defun js2-parse-plain-property (prop)
+  "Parse a non-getter/setter property in an object literal.
+PROP is the node representing the property:  a number, name or string."
+  (let* ((tt (js2-get-token))
+         (pos (js2-node-pos prop))
+         colon expr result)
+    (cond
+     ;; Abbreviated property, as in {foo, bar}
+     ((and (>= js2-language-version 200)
+           (or (= tt js2-COMMA)
+               (= tt js2-RC))
+           (not (js2-number-node-p prop)))
+      (js2-unget-token)
+      (setq result (make-js2-object-prop-node
+                    :pos pos
+                    :left prop
+                    :right prop
+                    :op-pos (js2-current-token-len)))
+      (js2-node-add-children result prop)
+      (js2-node-set-prop result 'SHORTHAND t)
+      result)
+     ;; Normal property
+     (t
+      (if (= tt js2-COLON)
+          (setq colon (- (js2-current-token-beg) pos)
+                expr (js2-parse-assign-expr))
+        (js2-report-error "msg.no.colon.prop")
+        (setq expr (make-js2-error-node)))
+      (setq result (make-js2-object-prop-node
+                   :pos pos
+                   ;; don't include last consumed token in length
+                   :len (- (+ (js2-node-pos expr)
+                              (js2-node-len expr))
+                           pos)
+                   :left prop
+                   :right expr
+                   :op-pos colon))
+      (js2-node-add-children result prop expr)
+      result))))
+
+(defun js2-parse-getter-setter-prop (pos prop type-string)
+  "Parse getter or setter property in an object literal.
+JavaScript syntax is:
+
+  { get foo() {...}, set foo(x) {...} }
+
+and expression closure style is also supported
+
+  { get foo() x, set foo(x) _x = x }
+
+POS is the start position of the `get' or `set' keyword.
+PROP is the `js2-name-node' representing the property name.
+GET-P is non-nil if the keyword was `get'."
+  (let ((type (cond
+               ((string= "get" type-string) js2-GET)
+               ((string= "set" type-string) js2-SET)
+               (t js2-FUNCTION)))
+        result end
+        (fn (js2-parse-function-expr)))
+    ;; it has to be an anonymous function, as we already parsed the name
+    (if (/= (js2-node-type fn) js2-FUNCTION)
+        (js2-report-error "msg.bad.prop")
+      (if (cl-plusp (length (js2-function-name fn)))
+          (js2-report-error "msg.bad.prop")))
+    (js2-node-set-prop fn 'GETTER_SETTER type)  ; for codegen
+    (setq end (js2-node-end fn)
+          result (make-js2-getter-setter-node :type type
+                                              :pos pos
+                                              :len (- end pos)
+                                              :left prop
+                                              :right fn))
+    (js2-node-add-children result prop fn)
+    result))
+
+(defun js2-create-name-node (&optional check-activation-p token string)
+  "Create a name node using the current token and, optionally, STRING.
+And, if CHECK-ACTIVATION-P is non-nil, use the value of TOKEN."
+  (let* ((beg (js2-current-token-beg))
+         (tt (js2-current-token-type))
+         (s (or string
+                (if (= js2-NAME tt)
+                    (js2-current-token-string)
+                  (js2-tt-name tt))))
+         name)
+    (setq name (make-js2-name-node :pos beg
+                                   :name s
+                                   :len (length s)))
+    (if check-activation-p
+        (js2-check-activation-name s (or token js2-NAME)))
+    name))
+
+;;; Indentation support
+
+;; This indenter is based on Karl Landström's "javascript.el" indenter.
+;; Karl cleverly deduces that the desired indentation level is often a
+;; function of paren/bracket/brace nesting depth, which can be determined
+;; quickly via the built-in `parse-partial-sexp' function.  His indenter
+;; then does some equally clever checks to see if we're in the context of a
+;; substatement of a possibly braceless statement keyword such as if, while,
+;; or finally.  This approach yields pretty good results.
+
+;; The indenter is often "wrong", however, and needs to be overridden.
+;; The right long-term solution is probably to emulate (or integrate
+;; with) cc-engine, but it's a nontrivial amount of coding.  Even when a
+;; parse tree from `js2-parse' is present, which is not true at the
+;; moment the user is typing, computing indentation is still thousands
+;; of lines of code to handle every possible syntactic edge case.
+
+;; In the meantime, the compromise solution is that we offer a "bounce
+;; indenter", configured with `js2-bounce-indent-p', which cycles the
+;; current line indent among various likely guess points.  This approach
+;; is far from perfect, but should at least make it slightly easier to
+;; move the line towards its desired indentation when manually
+;; overriding Karl's heuristic nesting guesser.
+
+;; I've made miscellaneous tweaks to Karl's code to handle some Ecma
+;; extensions such as `let' and Array comprehensions.  Major kudos to
+;; Karl for coming up with the initial approach, which packs a lot of
+;; punch for so little code.
+
+(defconst js2-possibly-braceless-keywords-re
+  (concat "else[ \t]+if\\|for[ \t]+each\\|"
+          (regexp-opt '("catch" "do" "else" "finally" "for" "if"
+                        "try" "while" "with" "let")))
+  "Regular expression matching keywords that are optionally
+followed by an opening brace.")
+
+(defconst js2-indent-operator-re
+  (concat "[-+*/%<>&^|?:.]\\([^-+*/]\\|$\\)\\|!?=\\|"
+          (regexp-opt '("in" "instanceof") 'words))
+  "Regular expression matching operators that affect indentation
+of continued expressions.")
+
+(defconst js2-declaration-keyword-re
+  (regexp-opt '("var" "let" "const") 'words)
+  "Regular expression matching variable declaration keywords.")
+
+(defun js2-re-search-forward-inner (regexp &optional bound count)
+  "Auxiliary function for `js2-re-search-forward'."
+  (let (parse saved-point)
+    (while (> count 0)
+      (re-search-forward regexp bound)
+      (setq parse (if saved-point
+                      (parse-partial-sexp saved-point (point))
+                    (syntax-ppss (point))))
+      (cond ((nth 3 parse)
+             (re-search-forward
+              (concat "\\(\\=\\|[^\\]\\|^\\)" (string (nth 3 parse)))
+              (save-excursion (end-of-line) (point)) t))
+            ((nth 7 parse)
+             (forward-line))
+            ((or (nth 4 parse)
+                 (and (eq (char-before) ?\/) (eq (char-after) ?\*)))
+             (re-search-forward "\\*/"))
+            (t
+             (setq count (1- count))))
+      (setq saved-point (point))))
+  (point))
+
+(defun js2-re-search-forward (regexp &optional bound noerror count)
+  "Search forward but ignore strings and comments.
+Invokes `re-search-forward' but treats the buffer as if strings
+and comments have been removed."
+  (let ((saved-point (point)))
+    (condition-case err
+        (cond ((null count)
+               (js2-re-search-forward-inner regexp bound 1))
+              ((< count 0)
+               (js2-re-search-backward-inner regexp bound (- count)))
+              ((> count 0)
+               (js2-re-search-forward-inner regexp bound count)))
+      (search-failed
+       (goto-char saved-point)
+       (unless noerror
+         (error (error-message-string err)))))))
+
+(defun js2-re-search-backward-inner (regexp &optional bound count)
+  "Auxiliary function for `js2-re-search-backward'."
+  (let (parse)
+    (while (> count 0)
+      (re-search-backward regexp bound)
+      (setq parse (syntax-ppss (point)))
+      (cond ((nth 3 parse)
+             (re-search-backward
+              (concat "\\([^\\]\\|^\\)" (string (nth 3 parse)))
+              (line-beginning-position) t))
+            ((nth 7 parse)
+             (goto-char (nth 8 parse)))
+            ((or (nth 4 parse)
+                 (and (eq (char-before) ?/) (eq (char-after) ?*)))
+             (re-search-backward "/\\*"))
+            (t
+             (setq count (1- count))))))
+  (point))
+
+(defun js2-re-search-backward (regexp &optional bound noerror count)
+  "Search backward but ignore strings and comments.
+Invokes `re-search-backward' but treats the buffer as if strings
+and comments have been removed."
+  (let ((saved-point (point)))
+    (condition-case err
+        (cond ((null count)
+               (js2-re-search-backward-inner regexp bound 1))
+              ((< count 0)
+               (js2-re-search-forward-inner regexp bound (- count)))
+              ((> count 0)
+               (js2-re-search-backward-inner regexp bound count)))
+      (search-failed
+       (goto-char saved-point)
+       (unless noerror
+         (error (error-message-string err)))))))
+
+(defun js2-looking-at-operator-p ()
+  "Return non-nil if text after point is a non-comma operator."
+  (and (looking-at js2-indent-operator-re)
+       (or (not (looking-at ":"))
+           (save-excursion
+             (and (js2-re-search-backward "[?:{]\\|\\<case\\>" nil t)
+                  (looking-at "?"))))))
+
+(defun js2-continued-expression-p ()
+  "Return non-nil if the current line continues an expression."
+  (save-excursion
+    (back-to-indentation)
+    (or (js2-looking-at-operator-p)
+        (when (catch 'found
+                (while (and (re-search-backward "\n" nil t)
+                            (let ((state (syntax-ppss)))
+                              (when (nth 4 state)
+                                (goto-char (nth 8 state))) ;; skip comments
+                              (skip-chars-backward " \t")
+                              (if (bolp)
+                                  t
+                                (throw 'found t))))))
+          (backward-char)
+          (when (js2-looking-at-operator-p)
+            (backward-char)
+            (not (looking-at "\\*\\|\\+\\+\\|--\\|/[/*]")))))))
+
+(defun js2-end-of-do-while-loop-p ()
+  "Return non-nil if word after point is `while' of a do-while
+statement, else returns nil. A braceless do-while statement
+spanning several lines requires that the start of the loop is
+indented to the same column as the current line."
+  (interactive)
+  (save-excursion
+    (when (looking-at "\\s-*\\<while\\>")
+      (if (save-excursion
+            (skip-chars-backward "[ \t\n]*}")
+            (looking-at "[ \t\n]*}"))
+          (save-excursion
+            (backward-list) (backward-word 1) (looking-at "\\<do\\>"))
+        (js2-re-search-backward "\\<do\\>" (point-at-bol) t)
+        (or (looking-at "\\<do\\>")
+            (let ((saved-indent (current-indentation)))
+              (while (and (js2-re-search-backward "^[ \t]*\\<" nil t)
+                          (/= (current-indentation) saved-indent)))
+              (and (looking-at "[ \t]*\\<do\\>")
+                   (not (js2-re-search-forward
+                         "\\<while\\>" (point-at-eol) t))
+                   (= (current-indentation) saved-indent))))))))
+
+(defun js2-multiline-decl-indentation ()
+  "Return the declaration indentation column if the current line belongs
+to a multiline declaration statement.  See `js2-pretty-multiline-declarations'."
+  (let (forward-sexp-function ; use Lisp version
+        at-opening-bracket)
+    (save-excursion
+      (back-to-indentation)
+      (when (not (looking-at js2-declaration-keyword-re))
+        (when (looking-at js2-indent-operator-re)
+          (goto-char (match-end 0))) ; continued expressions are ok
+        (while (and (not at-opening-bracket)
+                    (not (bobp))
+                    (let ((pos (point)))
+                      (save-excursion
+                        (js2-backward-sws)
+                        (or (eq (char-before) ?,)
+                            (and (not (eq (char-before) ?\;))
+                                 (prog2 (skip-syntax-backward ".")
+                                     (looking-at js2-indent-operator-re)
+                                   (js2-backward-sws))
+                                 (not (eq (char-before) ?\;)))
+                            (js2-same-line pos)))))
+          (condition-case _
+              (backward-sexp)
+            (scan-error (setq at-opening-bracket t))))
+        (when (looking-at js2-declaration-keyword-re)
+          (goto-char (match-end 0))
+          (1+ (current-column)))))))
+
+(defun js2-ctrl-statement-indentation ()
+  "Return the proper indentation of current line if it is a control statement.
+Returns an indentation if this line starts the body of a control
+statement without braces, else returns nil."
+  (let (forward-sexp-function)
+    (save-excursion
+      (back-to-indentation)
+      (when (and (not (js2-same-line (point-min)))
+                 (not (looking-at "{"))
+                 (js2-re-search-backward "[[:graph:]]" nil t)
+                 (not (looking-at "[{([]"))
+                 (progn
+                   (forward-char)
+                   (when (= (char-before) ?\))
+                     ;; scan-sexps sometimes throws an error
+                     (ignore-errors (backward-sexp))
+                     (skip-chars-backward " \t" (point-at-bol)))
+                   (let ((pt (point)))
+                     (back-to-indentation)
+                     (when (looking-at "}[ \t]*")
+                       (goto-char (match-end 0)))
+                     (and (looking-at js2-possibly-braceless-keywords-re)
+                          (= (match-end 0) pt)
+                          (not (js2-end-of-do-while-loop-p))))))
+        (+ (current-indentation) js2-basic-offset)))))
+
+(defun js2-indent-in-array-comp (parse-status)
+  "Return non-nil if we think we're in an array comprehension.
+In particular, return the buffer position of the first `for' kwd."
+  (let ((bracket (nth 1 parse-status))
+        (end (point)))
+    (when bracket
+      (save-excursion
+        (goto-char bracket)
+        (when (looking-at "\\[")
+          (forward-char 1)
+          (js2-forward-sws)
+          (if (looking-at "[[{]")
+              (let (forward-sexp-function) ; use Lisp version
+                (forward-sexp)             ; skip destructuring form
+                (js2-forward-sws)
+                (if (and (/= (char-after) ?,) ; regular array
+                         (looking-at "for"))
+                    (match-beginning 0)))
+            ;; to skip arbitrary expressions we need the parser,
+            ;; so we'll just guess at it.
+            (if (and (> end (point)) ; not empty literal
+                     (re-search-forward "[^,]]* \\(for\\) " end t)
+                     ;; not inside comment or string literal
+                     (let ((state (parse-partial-sexp bracket (point))))
+                       (not (or (nth 3 state) (nth 4 state)))))
+                (match-beginning 1))))))))
+
+(defun js2-array-comp-indentation (parse-status for-kwd)
+  (if (js2-same-line for-kwd)
+      ;; first continuation line
+      (save-excursion
+        (goto-char (nth 1 parse-status))
+        (forward-char 1)
+        (skip-chars-forward " \t")
+        (current-column))
+    (save-excursion
+      (goto-char for-kwd)
+      (current-column))))
+
+(defun js2-proper-indentation (parse-status)
+  "Return the proper indentation for the current line."
+  (save-excursion
+    (back-to-indentation)
+    (let* ((ctrl-stmt-indent (js2-ctrl-statement-indentation))
+           (at-closing-bracket (looking-at "[]})]"))
+           (same-indent-p (or at-closing-bracket
+                              (looking-at "\\<case\\>[^:]")
+                              (and (looking-at "\\<default:")
+                                   (save-excursion
+                                     (js2-backward-sws)
+                                     (not (memq (char-before) '(?, ?{)))))))
+           (continued-expr-p (js2-continued-expression-p))
+           (declaration-indent (and js2-pretty-multiline-declarations
+                                    (js2-multiline-decl-indentation)))
+           (bracket (nth 1 parse-status))
+           beg indent)
+      (cond
+       ;; indent array comprehension continuation lines specially
+       ((and bracket
+             (>= js2-language-version 170)
+             (not (js2-same-line bracket))
+             (setq beg (js2-indent-in-array-comp parse-status))
+             (>= (point) (save-excursion
+                           (goto-char beg)
+                           (point-at-bol)))) ; at or after first loop?
+        (js2-array-comp-indentation parse-status beg))
+
+       (ctrl-stmt-indent)
+
+       ((and declaration-indent continued-expr-p)
+        (+ declaration-indent js2-basic-offset))
+
+       (declaration-indent)
+
+       (bracket
+        (goto-char bracket)
+        (cond
+         ((looking-at "[({[][ \t]*\\(/[/*]\\|$\\)")
+          (when (save-excursion (skip-chars-backward " \t)")
+                                (looking-at ")"))
+            (backward-list))
+          (back-to-indentation)
+          (and (eq js2-pretty-multiline-declarations 'all)
+               (looking-at js2-declaration-keyword-re)
+               (goto-char (1+ (match-end 0))))
+          (setq indent
+                (cond (same-indent-p
+                       (current-column))
+                      (continued-expr-p
+                       (+ (current-column) (* 2 js2-basic-offset)))
+                      (t
+                       (+ (current-column) js2-basic-offset))))
+          (if (and js2-indent-switch-body
+                   (not at-closing-bracket)
+                   (looking-at "\\_<switch\\_>"))
+              (+ indent js2-basic-offset)
+            indent))
+         (t
+          (unless same-indent-p
+            (forward-char)
+            (skip-chars-forward " \t"))
+          (current-column))))
+
+       (continued-expr-p js2-basic-offset)
+
+       (t 0)))))
+
+(defun js2-lineup-comment (parse-status)
+  "Indent a multi-line block comment continuation line."
+  (let* ((beg (nth 8 parse-status))
+         (first-line (js2-same-line beg))
+         (offset (save-excursion
+                   (goto-char beg)
+                   (if (looking-at "/\\*")
+                       (+ 1 (current-column))
+                     0))))
+    (unless first-line
+      (indent-line-to offset))))
+
+(defun js2-backward-sws ()
+  "Move backward through whitespace and comments."
+  (interactive)
+  (while (forward-comment -1)))
+
+(defun js2-forward-sws ()
+  "Move forward through whitespace and comments."
+  (interactive)
+  (while (forward-comment 1)))
+
+(defun js2-current-indent (&optional pos)
+  "Return column of indentation on current line.
+If POS is non-nil, go to that point and return indentation for that line."
+  (save-excursion
+    (if pos
+        (goto-char pos))
+    (back-to-indentation)
+    (current-column)))
+
+(defun js2-arglist-close ()
+  "Return non-nil if we're on a line beginning with a close-paren/brace."
+  (save-excursion
+    (goto-char (point-at-bol))
+    (js2-forward-sws)
+    (looking-at "[])}]")))
+
+(defun js2-indent-looks-like-label-p ()
+  (goto-char (point-at-bol))
+  (js2-forward-sws)
+  (looking-at (concat js2-mode-identifier-re ":")))
+
+(defun js2-indent-in-objlit-p (parse-status)
+  "Return non-nil if this looks like an object-literal entry."
+  (let ((start (nth 1 parse-status)))
+    (and
+     start
+     (save-excursion
+       (and (zerop (forward-line -1))
+            (not (< (point) start))     ; crossed a {} boundary
+            (js2-indent-looks-like-label-p)))
+     (save-excursion
+       (js2-indent-looks-like-label-p)))))
+
+;; If prev line looks like foobar({ then we're passing an object
+;; literal to a function call, and people pretty much always want to
+;; de-dent back to the previous line, so move the 'basic-offset'
+;; position to the front.
+(defun js2-indent-objlit-arg-p (parse-status)
+  (save-excursion
+    (back-to-indentation)
+    (js2-backward-sws)
+    (and (eq (1- (point)) (nth 1 parse-status))
+         (eq (char-before) ?{)
+         (progn
+           (forward-char -1)
+           (skip-chars-backward " \t")
+           (eq (char-before) ?\()))))
+
+(defun js2-indent-case-block-p ()
+  (save-excursion
+    (back-to-indentation)
+    (js2-backward-sws)
+    (goto-char (point-at-bol))
+    (skip-chars-forward " \t")
+    (looking-at "case\\s-.+:")))
+
+(defun js2-bounce-indent (normal-col parse-status &optional backwards)
+  "Cycle among alternate computed indentation positions.
+PARSE-STATUS is the result of `parse-partial-sexp' from the beginning
+of the buffer to the current point.  NORMAL-COL is the indentation
+column computed by the heuristic guesser based on current paren,
+bracket, brace and statement nesting.  If BACKWARDS, cycle positions
+in reverse."
+  (let ((cur-indent (js2-current-indent))
+        (old-buffer-undo-list buffer-undo-list)
+        ;; Emacs 21 only has `count-lines', not `line-number-at-pos'
+        (current-line (save-excursion
+                        (forward-line 0)  ; move to bol
+                        (1+ (count-lines (point-min) (point)))))
+        positions pos main-pos anchor arglist-cont same-indent
+        basic-offset computed-pos)
+    ;; temporarily don't record undo info, if user requested this
+    (when js2-mode-indent-inhibit-undo
+      (setq buffer-undo-list t))
+    (unwind-protect
+        (progn
+          ;; First likely point:  indent from beginning of previous code line
+          (push (setq basic-offset
+                      (+ (save-excursion
+                           (back-to-indentation)
+                           (js2-backward-sws)
+                           (back-to-indentation)
+                           (current-column))
+                         js2-basic-offset))
+                positions)
+
+          ;; (First + epsilon) likely point:  indent 2x from beginning of
+          ;; previous code line.  Google does it this way.
+          (push (setq basic-offset
+                      (+ (save-excursion
+                           (back-to-indentation)
+                           (js2-backward-sws)
+                           (back-to-indentation)
+                           (current-column))
+                         (* 2 js2-basic-offset)))
+                positions)
+
+          ;; Second likely point:  indent from assign-expr RHS.  This
+          ;; is just a crude guess based on finding " = " on the previous
+          ;; line containing actual code.
+          (setq pos (save-excursion
+                      (forward-line -1)
+                      (goto-char (point-at-bol))
+                      (when (re-search-forward "\\s-+\\(=\\)\\s-+"
+                                               (point-at-eol) t)
+                        (goto-char (match-end 1))
+                        (skip-chars-forward " \t\r\n")
+                        (current-column))))
+          (when pos
+            (cl-incf pos js2-basic-offset)
+            (push pos positions))
+
+          ;; Third likely point:  same indent as previous line of code.
+          ;; Make it the first likely point if we're not on an
+          ;; arglist-close line and previous line ends in a comma, or
+          ;; both this line and prev line look like object-literal
+          ;; elements.
+          (setq pos (save-excursion
+                      (goto-char (point-at-bol))
+                      (js2-backward-sws)
+                      (back-to-indentation)
+                      (prog1
+                          (current-column)
+                        ;; while we're here, look for trailing comma
+                        (if (save-excursion
+                              (goto-char (point-at-eol))
+                              (js2-backward-sws)
+                              (eq (char-before) ?,))
+                            (setq arglist-cont (1- (point)))))))
+          (when pos
+            (if (and (or arglist-cont
+                         (js2-indent-in-objlit-p parse-status))
+                     (not (js2-arglist-close)))
+                (setq same-indent pos))
+            (push pos positions))
+
+          ;; Fourth likely point:  first preceding code with less indentation.
+          ;; than the immediately preceding code line.
+          (setq pos (save-excursion
+                      (back-to-indentation)
+                      (js2-backward-sws)
+                      (back-to-indentation)
+                      (setq anchor (current-column))
+                      (while (and (zerop (forward-line -1))
+                                  (>= (progn
+                                        (back-to-indentation)
+                                        (current-column))
+                                      anchor)))
+                      (setq pos (current-column))))
+          (push pos positions)
+
+          ;; nesting-heuristic position, main by default
+          (push (setq main-pos normal-col) positions)
+
+          ;; delete duplicates and sort positions list
+          (setq positions (sort (delete-dups positions) '<))
+
+          ;; comma-list continuation lines:  prev line indent takes precedence
+          (if same-indent
+              (setq main-pos same-indent))
+
+          ;; common special cases where we want to indent in from previous line
+          (if (or (js2-indent-case-block-p)
+                  (js2-indent-objlit-arg-p parse-status))
+              (setq main-pos basic-offset))
+
+          ;; if bouncing backwards, reverse positions list
+          (if backwards
+              (setq positions (reverse positions)))
+
+          ;; record whether we're already sitting on one of the alternatives
+          (setq pos (member cur-indent positions))
+
+          (cond
+           ;; case 0:  we're one one of the alternatives and this is the
+           ;; first time they've pressed TAB on this line (best-guess).
+           ((and js2-mode-indent-ignore-first-tab
+                 pos
+                 ;; first time pressing TAB on this line?
+                 (not (eq js2-mode-last-indented-line current-line)))
+            ;; do nothing
+            (setq computed-pos nil))
+           ;; case 1:  only one computed position => use it
+           ((null (cdr positions))
+            (setq computed-pos 0))
+           ;; case 2:  not on any of the computed spots => use main spot
+           ((not pos)
+            (setq computed-pos (js2-position main-pos positions)))
+           ;; case 3:  on last position:  cycle to first position
+           ((null (cdr pos))
+            (setq computed-pos 0))
+           ;; case 4:  on intermediate position:  cycle to next position
+           (t
+            (setq computed-pos (js2-position (cl-second pos) positions))))
+
+          ;; see if any hooks want to indent; otherwise we do it
+          (cl-loop with result = nil
+                   for hook in js2-indent-hook
+                   while (null result)
+                   do
+                   (setq result (funcall hook positions computed-pos))
+                   finally do
+                   (unless (or result (null computed-pos))
+                     (indent-line-to (nth computed-pos positions)))))
+
+      ;; finally
+      (if js2-mode-indent-inhibit-undo
+          (setq buffer-undo-list old-buffer-undo-list))
+      ;; see commentary for `js2-mode-last-indented-line'
+      (setq js2-mode-last-indented-line current-line))))
+
+(defun js2-indent-bounce-backwards ()
+  "Calls `js2-indent-line'.  When `js2-bounce-indent-p',
+cycles between the computed indentation positions in reverse order."
+  (interactive)
+  (js2-indent-line t))
+
+(defun js2-1-line-comment-continuation-p ()
+  "Return t if we're in a 1-line comment continuation.
+If so, we don't ever want to use bounce-indent."
+  (save-excursion
+    (and (progn
+           (forward-line 0)
+           (looking-at "\\s-*//"))
+         (progn
+           (forward-line -1)
+           (forward-line 0)
+           (when (looking-at "\\s-*$")
+             (js2-backward-sws)
+             (forward-line 0))
+           (looking-at "\\s-*//")))))
+
+(defun js2-indent-line (&optional bounce-backwards)
+  "Indent the current line as JavaScript source text."
+  (interactive)
+  (let (parse-status offset indent-col
+        ;; Don't whine about errors/warnings when we're indenting.
+        ;; This has to be set before calling parse-partial-sexp below.
+        (inhibit-point-motion-hooks t))
+    (setq parse-status (save-excursion
+                         (syntax-ppss (point-at-bol)))
+          offset (- (point) (save-excursion
+                              (back-to-indentation)
+                              (point))))
+    (js2-with-underscore-as-word-syntax
+     (if (nth 4 parse-status)
+         (js2-lineup-comment parse-status)
+       (setq indent-col (js2-proper-indentation parse-status))
+       ;; See comments below about `js2-mode-last-indented-line'.
+       (cond
+        ;; bounce-indenting is disabled during electric-key indent.
+        ;; It doesn't work well on first line of buffer.
+        ((and js2-bounce-indent-p
+              (not (js2-same-line (point-min)))
+              (not (js2-1-line-comment-continuation-p)))
+         (js2-bounce-indent indent-col parse-status bounce-backwards))
+        ;; just indent to the guesser's likely spot
+        (t (indent-line-to indent-col))))
+     (when (cl-plusp offset)
+       (forward-char offset)))))
+
+(defun js2-indent-region (start end)
+  "Indent the region, but don't use bounce indenting."
+  (let ((js2-bounce-indent-p nil)
+        (indent-region-function nil)
+        (after-change-functions (remq 'js2-mode-edit
+                                      after-change-functions)))
+    (indent-region start end nil) ; nil for byte-compiler
+    (js2-mode-edit start end (- end start))))
+
+(defvar js2-minor-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "C-c C-`") #'js2-next-error)
+    (define-key map [mouse-1] #'js2-mode-show-node)
+    map)
+  "Keymap used when `js2-minor-mode' is active.")
+
+;;;###autoload
+(define-minor-mode js2-minor-mode
+  "Minor mode for running js2 as a background linter.
+This allows you to use a different major mode for JavaScript editing,
+such as `js-mode', while retaining the asynchronous error/warning
+highlighting features of `js2-mode'."
+  :group 'js2-mode
+  :lighter " js-lint"
+  (if js2-minor-mode
+      (js2-minor-mode-enter)
+    (js2-minor-mode-exit)))
+
+(defun js2-minor-mode-enter ()
+  "Initialization for `js2-minor-mode'."
+  (set (make-local-variable 'max-lisp-eval-depth)
+       (max max-lisp-eval-depth 3000))
+  (setq next-error-function #'js2-next-error)
+  (js2-set-default-externs)
+  ;; Experiment:  make reparse-delay longer for longer files.
+  (if (cl-plusp js2-dynamic-idle-timer-adjust)
+      (setq js2-idle-timer-delay
+            (* js2-idle-timer-delay
+               (/ (point-max) js2-dynamic-idle-timer-adjust))))
+  (setq js2-mode-buffer-dirty-p t
+        js2-mode-parsing nil)
+  (set (make-local-variable 'js2-highlight-level) 0) ; no syntax highlighting
+  (add-hook 'after-change-functions #'js2-minor-mode-edit nil t)
+  (add-hook 'change-major-mode-hook #'js2-minor-mode-exit nil t)
+  (when js2-include-jslint-globals
+    (add-hook 'js2-post-parse-callbacks 'js2-apply-jslint-globals nil t))
+  (run-hooks 'js2-init-hook)
+  (js2-reparse))
+
+(defun js2-minor-mode-exit ()
+  "Turn off `js2-minor-mode'."
+  (setq next-error-function nil)
+  (remove-hook 'after-change-functions #'js2-mode-edit t)
+  (remove-hook 'change-major-mode-hook #'js2-minor-mode-exit t)
+  (when js2-mode-node-overlay
+    (delete-overlay js2-mode-node-overlay)
+    (setq js2-mode-node-overlay nil))
+  (js2-remove-overlays)
+  (remove-hook 'js2-post-parse-callbacks 'js2-apply-jslint-globals t)
+  (setq js2-mode-ast nil))
+
+(defvar js2-source-buffer nil "Linked source buffer for diagnostics view")
+(make-variable-buffer-local 'js2-source-buffer)
+
+(cl-defun js2-display-error-list ()
+  "Display a navigable buffer listing parse errors/warnings."
+  (interactive)
+  (unless (js2-have-errors-p)
+    (message "No errors")
+    (cl-return-from js2-display-error-list))
+  (cl-labels ((annotate-list
+               (lst type)
+               "Add diagnostic TYPE and line number to errs list"
+               (mapcar (lambda (err)
+                         (list err type (line-number-at-pos (nth 1 err))))
+                       lst)))
+    (let* ((srcbuf (current-buffer))
+           (errbuf (get-buffer-create "*js-lint*"))
+           (errors (annotate-list
+                    (when js2-mode-ast (js2-ast-root-errors js2-mode-ast))
+                    'js2-error))  ; must be a valid face name
+           (warnings (annotate-list
+                      (when js2-mode-ast (js2-ast-root-warnings js2-mode-ast))
+                      'js2-warning))  ; must be a valid face name
+           (all-errs (sort (append errors warnings)
+                           (lambda (e1 e2) (< (cl-cadar e1) (cl-cadar e2))))))
+      (with-current-buffer errbuf
+        (let ((inhibit-read-only t))
+          (erase-buffer)
+          (dolist (err all-errs)
+            (cl-destructuring-bind ((msg-key beg _end &rest) type line) err
+              (insert-text-button
+               (format "line %d: %s" line (js2-get-msg msg-key))
+               'face type
+               'follow-link "\C-m"
+               'action 'js2-error-buffer-jump
+               'js2-msg (js2-get-msg msg-key)
+               'js2-pos beg)
+              (insert "\n"))))
+        (js2-error-buffer-mode)
+        (setq js2-source-buffer srcbuf)
+        (pop-to-buffer errbuf)
+        (goto-char (point-min))
+        (unless (eobp)
+          (js2-error-buffer-view))))))
+
+(defvar js2-error-buffer-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map "n" #'js2-error-buffer-next)
+    (define-key map "p" #'js2-error-buffer-prev)
+    (define-key map (kbd "RET") #'js2-error-buffer-jump)
+    (define-key map "o" #'js2-error-buffer-view)
+    (define-key map "q" #'js2-error-buffer-quit)
+    map)
+  "Keymap used for js2 diagnostics buffers.")
+
+(defun js2-error-buffer-mode ()
+  "Major mode for js2 diagnostics buffers.
+Selecting an error will jump it to the corresponding source-buffer error.
+\\{js2-error-buffer-mode-map}"
+  (interactive)
+  (setq major-mode 'js2-error-buffer-mode
+        mode-name "JS Lint Diagnostics")
+  (use-local-map js2-error-buffer-mode-map)
+  (setq truncate-lines t)
+  (set-buffer-modified-p nil)
+  (setq buffer-read-only t)
+  (run-hooks 'js2-error-buffer-mode-hook))
+
+(defun js2-error-buffer-next ()
+  "Move to next error and view it."
+  (interactive)
+  (when (zerop (forward-line 1))
+    (js2-error-buffer-view)))
+
+(defun js2-error-buffer-prev ()
+  "Move to previous error and view it."
+  (interactive)
+  (when (zerop (forward-line -1))
+    (js2-error-buffer-view)))
+
+(defun js2-error-buffer-quit ()
+  "Kill the current buffer."
+  (interactive)
+  (kill-buffer))
+
+(defun js2-error-buffer-jump (&rest ignored)
+  "Jump cursor to current error in source buffer."
+  (interactive)
+  (when (js2-error-buffer-view)
+    (pop-to-buffer js2-source-buffer)))
+
+(defun js2-error-buffer-view ()
+  "Scroll source buffer to show error at current line."
+  (interactive)
+  (cond
+   ((not (eq major-mode 'js2-error-buffer-mode))
+    (message "Not in a js2 errors buffer"))
+   ((not (buffer-live-p js2-source-buffer))
+    (message "Source buffer has been killed"))
+   ((not (wholenump (get-text-property (point) 'js2-pos)))
+    (message "There does not seem to be an error here"))
+   (t
+    (let ((pos (get-text-property (point) 'js2-pos))
+          (msg (get-text-property (point) 'js2-msg)))
+      (save-selected-window
+        (pop-to-buffer js2-source-buffer)
+        (goto-char pos)
+        (message msg))))))
+
+;;;###autoload
+(define-derived-mode js2-mode prog-mode "Javascript-IDE"
+  ;; FIXME: Should derive from js-mode.
+  "Major mode for editing JavaScript code."
+  ;; Used by comment-region; don't change it.
+  (set (make-local-variable 'comment-start) "//")
+  (set (make-local-variable 'comment-end) "")
+  (set (make-local-variable 'comment-start-skip) js2-comment-start-skip)
+  (set (make-local-variable 'max-lisp-eval-depth)
+       (max max-lisp-eval-depth 3000))
+  (set (make-local-variable 'indent-line-function) #'js2-indent-line)
+  (set (make-local-variable 'indent-region-function) #'js2-indent-region)
+  (set (make-local-variable 'fill-paragraph-function) #'c-fill-paragraph)
+  (set (make-local-variable 'comment-line-break-function) #'js2-line-break)
+  (set (make-local-variable 'beginning-of-defun-function) #'js2-beginning-of-defun)
+  (set (make-local-variable 'end-of-defun-function) #'js2-end-of-defun)
+  ;; We un-confuse `parse-partial-sexp' by setting syntax-table properties
+  ;; for characters inside regexp literals.
+  (set (make-local-variable 'parse-sexp-lookup-properties) t)
+  ;; this is necessary to make `show-paren-function' work properly
+  (set (make-local-variable 'parse-sexp-ignore-comments) t)
+  ;; needed for M-x rgrep, among other things
+  (put 'js2-mode 'find-tag-default-function #'js2-mode-find-tag)
+
+  (set (make-local-variable 'electric-indent-chars)
+       (append "{}()[]:;,*." electric-indent-chars))
+  (set (make-local-variable 'electric-layout-rules)
+       '((?\; . after) (?\{ . after) (?\} . before)))
+
+  ;; some variables needed by cc-engine for paragraph-fill, etc.
+  (setq c-comment-prefix-regexp js2-comment-prefix-regexp
+        c-comment-start-regexp "/[*/]\\|\\s|"
+        c-line-comment-starter "//"
+        c-paragraph-start js2-paragraph-start
+        c-paragraph-separate "$"
+        c-syntactic-ws-start js2-syntactic-ws-start
+        c-syntactic-ws-end js2-syntactic-ws-end
+        c-syntactic-eol js2-syntactic-eol)
+
+  (let ((c-buffer-is-cc-mode t))
+    ;; Copied from `js-mode'.  Also see Bug#6071.
+    (make-local-variable 'paragraph-start)
+    (make-local-variable 'paragraph-separate)
+    (make-local-variable 'paragraph-ignore-fill-prefix)
+    (make-local-variable 'adaptive-fill-mode)
+    (make-local-variable 'adaptive-fill-regexp)
+    (c-setup-paragraph-variables))
+
+  (setq font-lock-defaults '(nil t))
+
+  ;; Experiment:  make reparse-delay longer for longer files.
+  (when (cl-plusp js2-dynamic-idle-timer-adjust)
+    (setq js2-idle-timer-delay
+          (* js2-idle-timer-delay
+             (/ (point-max) js2-dynamic-idle-timer-adjust))))
+
+  (add-hook 'change-major-mode-hook #'js2-mode-exit nil t)
+  (add-hook 'after-change-functions #'js2-mode-edit nil t)
+  (setq imenu-create-index-function #'js2-mode-create-imenu-index)
+  (setq next-error-function #'js2-next-error)
+  (imenu-add-to-menubar (concat "IM-" mode-name))
+  (add-to-invisibility-spec '(js2-outline . t))
+  (set (make-local-variable 'line-move-ignore-invisible) t)
+  (set (make-local-variable 'forward-sexp-function) #'js2-mode-forward-sexp)
+
+  (setq js2-mode-functions-hidden nil
+        js2-mode-comments-hidden nil
+        js2-mode-buffer-dirty-p t
+        js2-mode-parsing nil)
+
+  (js2-set-default-externs)
+
+  (when js2-include-jslint-globals
+    (add-hook 'js2-post-parse-callbacks 'js2-apply-jslint-globals nil t))
+
+  (run-hooks 'js2-init-hook)
+
+  (js2-reparse))
+
+(defun js2-mode-exit ()
+  "Exit `js2-mode' and clean up."
+  (interactive)
+  (when js2-mode-node-overlay
+    (delete-overlay js2-mode-node-overlay)
+    (setq js2-mode-node-overlay nil))
+  (js2-remove-overlays)
+  (setq js2-mode-ast nil)
+  (remove-hook 'change-major-mode-hook #'js2-mode-exit t)
+  (remove-from-invisibility-spec '(js2-outline . t))
+  (js2-mode-show-all)
+  (with-silent-modifications
+    (js2-clear-face (point-min) (point-max))))
+
+(defun js2-mode-reset-timer ()
+  "Cancel any existing parse timer and schedule a new one."
+  (if js2-mode-parse-timer
+      (cancel-timer js2-mode-parse-timer))
+  (setq js2-mode-parsing nil)
+  (let ((timer (timer-create)))
+    (setq js2-mode-parse-timer timer)
+    (timer-set-function timer 'js2-mode-idle-reparse (list (current-buffer)))
+    (timer-set-idle-time timer js2-idle-timer-delay)
+    ;; http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12326
+    (timer-activate-when-idle timer nil)))
+
+(defun js2-mode-idle-reparse (buffer)
+  "Run `js2-reparse' if BUFFER is the current buffer, or schedule
+it to be reparsed when the buffer is selected."
+  (cond ((eq buffer (current-buffer))
+         (js2-reparse))
+        ((buffer-live-p buffer)
+         ;; reparse when the buffer is selected again
+         (with-current-buffer buffer
+           (add-hook 'window-configuration-change-hook
+                     #'js2-mode-idle-reparse-inner
+                     nil t)))))
+
+(defun js2-mode-idle-reparse-inner ()
+  (remove-hook 'window-configuration-change-hook
+               #'js2-mode-idle-reparse-inner
+               t)
+  (js2-reparse))
+
+(defun js2-mode-edit (_beg _end _len)
+  "Schedule a new parse after buffer is edited.
+Buffer edit spans from BEG to END and is of length LEN."
+  (setq js2-mode-buffer-dirty-p t)
+  (js2-mode-hide-overlay)
+  (js2-mode-reset-timer))
+
+(defun js2-minor-mode-edit (_beg _end _len)
+  "Callback for buffer edits in `js2-mode'.
+Schedules a new parse after buffer is edited.
+Buffer edit spans from BEG to END and is of length LEN."
+  (setq js2-mode-buffer-dirty-p t)
+  (js2-mode-hide-overlay)
+  (js2-mode-reset-timer))
+
+(defun js2-reparse (&optional force)
+  "Re-parse current buffer after user finishes some data entry.
+If we get any user input while parsing, including cursor motion,
+we discard the parse and reschedule it.  If FORCE is nil, then the
+buffer will only rebuild its `js2-mode-ast' if the buffer is dirty."
+  (let (time
+        interrupted-p
+        (js2-compiler-strict-mode js2-mode-show-strict-warnings))
+    (unless js2-mode-parsing
+      (setq js2-mode-parsing t)
+      (unwind-protect
+          (when (or js2-mode-buffer-dirty-p force)
+            (js2-remove-overlays)
+            (setq js2-mode-buffer-dirty-p nil
+                  js2-mode-fontifications nil
+                  js2-mode-deferred-properties nil)
+            (if js2-mode-verbose-parse-p
+                (message "parsing..."))
+            (setq time
+                  (js2-time
+                   (setq interrupted-p
+                         (catch 'interrupted
+                           (js2-parse)
+                           (with-silent-modifications
+                             ;; if parsing is interrupted, comments and regex
+                             ;; literals stay ignored by `parse-partial-sexp'
+                             (remove-text-properties (point-min) (point-max)
+                                                     '(syntax-table))
+                             (js2-mode-apply-deferred-properties)
+                             (js2-mode-remove-suppressed-warnings)
+                             (js2-mode-show-warnings)
+                             (js2-mode-show-errors)
+                             (if (>= js2-highlight-level 1)
+                                 (js2-highlight-jsdoc js2-mode-ast)))
+                           nil))))
+            (if interrupted-p
+                (progn
+                  ;; unfinished parse => try again
+                  (setq js2-mode-buffer-dirty-p t)
+                  (js2-mode-reset-timer))
+              (if js2-mode-verbose-parse-p
+                  (message "Parse time: %s" time))))
+        (setq js2-mode-parsing nil)
+        (unless interrupted-p
+          (setq js2-mode-parse-timer nil))))))
+
+(defun js2-mode-show-node (event)
+  "Debugging aid:  highlight selected AST node on mouse click."
+  (interactive "e")
+  (mouse-set-point event)
+  (setq deactivate-mark t)
+  (when js2-mode-show-overlay
+    (let ((node (js2-node-at-point))
+          beg end)
+      (if (null node)
+          (message "No node found at location %s" (point))
+        (setq beg (js2-node-abs-pos node)
+              end (+ beg (js2-node-len node)))
+        (if js2-mode-node-overlay
+            (move-overlay js2-mode-node-overlay beg end)
+          (setq js2-mode-node-overlay (make-overlay beg end))
+          (overlay-put js2-mode-node-overlay 'font-lock-face 'highlight))
+        (with-silent-modifications
+          (put-text-property beg end 'point-left #'js2-mode-hide-overlay))
+        (message "%s, parent: %s"
+                 (js2-node-short-name node)
+                 (if (js2-node-parent node)
+                     (js2-node-short-name (js2-node-parent node))
+                   "nil"))))))
+
+(defun js2-mode-hide-overlay (&optional _p1 p2)
+  "Remove the debugging overlay when the point moves.
+P1 and P2 are the old and new values of point, respectively."
+  (when js2-mode-node-overlay
+    (let ((beg (overlay-start js2-mode-node-overlay))
+          (end (overlay-end js2-mode-node-overlay)))
+      ;; Sometimes we're called spuriously.
+      (unless (and p2
+                   (>= p2 beg)
+                   (<= p2 end))
+        (with-silent-modifications
+          (remove-text-properties beg end '(point-left nil)))
+        (delete-overlay js2-mode-node-overlay)
+        (setq js2-mode-node-overlay nil)))))
+
+(defun js2-mode-reset ()
+  "Debugging helper:  reset everything."
+  (interactive)
+  (js2-mode-exit)
+  (js2-mode))
+
+(defun js2-mode-show-warn-or-err (e face)
+  "Highlight a warning or error E with FACE.
+E is a list of ((MSG-KEY MSG-ARG) BEG LEN OVERRIDE-FACE).
+The last element is optional.  When present, use instead of FACE."
+  (let* ((key (cl-first e))
+         (beg (cl-second e))
+         (end (+ beg (cl-third e)))
+         ;; Don't inadvertently go out of bounds.
+         (beg (max (point-min) (min beg (point-max))))
+         (end (max (point-min) (min end (point-max))))
+         (ovl (make-overlay beg end)))
+    (overlay-put ovl 'font-lock-face (or (cl-fourth e) face))
+    (overlay-put ovl 'js2-error t)
+    (put-text-property beg end 'help-echo (js2-get-msg key))
+    (put-text-property beg end 'point-entered #'js2-echo-error)))
+
+(defun js2-remove-overlays ()
+  "Remove overlays from buffer that have a `js2-error' property."
+  (let ((beg (point-min))
+        (end (point-max)))
+    (save-excursion
+      (dolist (o (overlays-in beg end))
+        (when (overlay-get o 'js2-error)
+          (delete-overlay o))))))
+
+(defun js2-error-at-point (&optional pos)
+  "Return non-nil if there's an error overlay at POS.
+Defaults to point."
+  (cl-loop with pos = (or pos (point))
+           for o in (overlays-at pos)
+           thereis (overlay-get o 'js2-error)))
+
+(defun js2-mode-apply-deferred-properties ()
+  "Apply fontifications and other text properties recorded during parsing."
+  (when (cl-plusp js2-highlight-level)
+    ;; We defer clearing faces as long as possible to eliminate flashing.
+    (js2-clear-face (point-min) (point-max))
+    ;; Have to reverse the recorded fontifications list so that errors
+    ;; and warnings overwrite the normal fontifications.
+    (dolist (f (nreverse js2-mode-fontifications))
+      (put-text-property (cl-first f) (cl-second f) 'font-lock-face (cl-third f)))
+    (setq js2-mode-fontifications nil))
+  (dolist (p js2-mode-deferred-properties)
+    (apply #'put-text-property p))
+  (setq js2-mode-deferred-properties nil))
+
+(defun js2-mode-show-errors ()
+  "Highlight syntax errors."
+  (when js2-mode-show-parse-errors
+    (dolist (e (js2-ast-root-errors js2-mode-ast))
+      (js2-mode-show-warn-or-err e 'js2-error))))
+
+(defun js2-mode-remove-suppressed-warnings ()
+  "Take suppressed warnings out of the AST warnings list.
+This ensures that the counts and `next-error' are correct."
+  (setf (js2-ast-root-warnings js2-mode-ast)
+        (js2-delete-if
+         (lambda (e)
+           (let ((key (caar e)))
+             (or
+              (and (not js2-strict-trailing-comma-warning)
+                   (string-match "trailing\\.comma" key))
+              (and (not js2-strict-cond-assign-warning)
+                   (string= key "msg.equal.as.assign"))
+              (and js2-missing-semi-one-line-override
+                   (string= key "msg.missing.semi")
+                   (let* ((beg (cl-second e))
+                          (node (js2-node-at-point beg))
+                          (fn (js2-mode-find-parent-fn node))
+                          (body (and fn (js2-function-node-body fn)))
+                          (lc (and body (js2-node-abs-pos body)))
+                          (rc (and lc (+ lc (js2-node-len body)))))
+                     (and fn
+                          (or (null body)
+                              (save-excursion
+                                (goto-char beg)
+                                (and (js2-same-line lc)
+                                     (js2-same-line rc))))))))))
+         (js2-ast-root-warnings js2-mode-ast))))
+
+(defun js2-mode-show-warnings ()
+  "Highlight strict-mode warnings."
+  (when js2-mode-show-strict-warnings
+    (dolist (e (js2-ast-root-warnings js2-mode-ast))
+      (js2-mode-show-warn-or-err e 'js2-warning))))
+
+(defun js2-echo-error (_old-point new-point)
+  "Called by point-motion hooks."
+  (let ((msg (get-text-property new-point 'help-echo)))
+    (when (and (stringp msg)
+               (not (active-minibuffer-window))
+               (not (current-message)))
+      (message msg))))
+
+(defalias 'js2-echo-help #'js2-echo-error)
+
+(defun js2-line-break (&optional _soft)
+  "Break line at point and indent, continuing comment if within one.
+If inside a string, and `js2-concat-multiline-strings' is not
+nil, turn it into concatenation."
+  (interactive)
+  (let ((parse-status (syntax-ppss)))
+    (cond
+     ;; Check if we're inside a string.
+     ((nth 3 parse-status)
+      (if js2-concat-multiline-strings
+          (js2-mode-split-string parse-status)
+        (insert "\n")))
+     ;; Check if inside a block comment.
+     ((nth 4 parse-status)
+      (js2-mode-extend-comment (nth 8 parse-status)))
+     (t
+      (newline-and-indent)))))
+
+(defun js2-mode-split-string (parse-status)
+  "Turn a newline in mid-string into a string concatenation.
+PARSE-STATUS is as documented in `parse-partial-sexp'."
+  (let* ((quote-char (nth 3 parse-status))
+         (at-eol (eq js2-concat-multiline-strings 'eol)))
+    (insert quote-char)
+    (insert (if at-eol " +\n" "\n"))
+    (unless at-eol
+      (insert "+ "))
+    (js2-indent-line)
+    (insert quote-char)
+    (when (eolp)
+      (insert quote-char)
+      (backward-char 1))))
+
+(defun js2-mode-extend-comment (start-pos)
+  "Indent the line and, when inside a comment block, add comment prefix."
+  (let (star single col first-line needs-close)
+    (save-excursion
+      (back-to-indentation)
+      (when (< (point) start-pos)
+        (goto-char start-pos))
+      (cond
+       ((looking-at "\\*[^/]")
+        (setq star t
+              col (current-column)))
+       ((looking-at "/\\*")
+        (setq star t
+              first-line t
+              col (1+ (current-column))))
+       ((looking-at "//")
+        (setq single t
+              col (current-column)))))
+    ;; Heuristic for whether we need to close the comment:
+    ;; if we've got a parse error here, assume it's an unterminated
+    ;; comment.
+    (setq needs-close
+          (or
+           (eq (get-text-property (1- (point)) 'point-entered)
+               'js2-echo-error)
+           ;; The heuristic above doesn't work well when we're
+           ;; creating a comment and there's another one downstream,
+           ;; as our parser thinks this one ends at the end of the
+           ;; next one.  (You can have a /* inside a js block comment.)
+           ;; So just close it if the next non-ws char isn't a *.
+           (and first-line
+                (eolp)
+                (save-excursion
+                  (skip-chars-forward " \t\r\n")
+                  (not (eq (char-after) ?*))))))
+    (delete-horizontal-space)
+    (insert "\n")
+    (cond
+     (star
+      (indent-to col)
+      (insert "* ")
+      (if (and first-line needs-close)
+          (save-excursion
+            (insert "\n")
+            (indent-to col)
+            (insert "*/"))))
+     ((and single
+           (save-excursion
+              (and (zerop (forward-line 1))
+                   (looking-at "\\s-*//"))))
+      (indent-to col)
+      (insert "// ")))
+    ;; Don't need to extend the comment after all.
+    (js2-indent-line)))
+
+(defun js2-beginning-of-line ()
+  "Toggle point between bol and first non-whitespace char in line.
+Also moves past comment delimiters when inside comments."
+  (interactive)
+  (let (node)
+    (cond
+     ((bolp)
+      (back-to-indentation))
+     ((looking-at "//")
+      (skip-chars-forward "/ \t"))
+     ((and (eq (char-after) ?*)
+           (setq node (js2-comment-at-point))
+           (memq (js2-comment-node-format node) '(jsdoc block))
+           (save-excursion
+             (skip-chars-backward " \t")
+             (bolp)))
+      (skip-chars-forward "\* \t"))
+     (t
+      (goto-char (point-at-bol))))))
+
+(defun js2-end-of-line ()
+  "Toggle point between eol and last non-whitespace char in line."
+  (interactive)
+  (if (eolp)
+      (skip-chars-backward " \t")
+    (goto-char (point-at-eol))))
+
+(defun js2-mode-wait-for-parse (callback)
+  "Invoke CALLBACK when parsing is finished.
+If parsing is already finished, calls CALLBACK immediately."
+  (if (not js2-mode-buffer-dirty-p)
+      (funcall callback)
+    (push callback js2-mode-pending-parse-callbacks)
+    (add-hook 'js2-parse-finished-hook #'js2-mode-parse-finished)))
+
+(defun js2-mode-parse-finished ()
+  "Invoke callbacks in `js2-mode-pending-parse-callbacks'."
+  ;; We can't let errors propagate up, since it prevents the
+  ;; `js2-parse' method from completing normally and returning
+  ;; the ast, which makes things mysteriously not work right.
+  (unwind-protect
+      (dolist (cb js2-mode-pending-parse-callbacks)
+        (condition-case err
+            (funcall cb)
+          (error (message "%s" err))))
+    (setq js2-mode-pending-parse-callbacks nil)))
+
+(defun js2-mode-flag-region (from to flag)
+  "Hide or show text from FROM to TO, according to FLAG.
+If FLAG is nil then text is shown, while if FLAG is t the text is hidden.
+Returns the created overlay if FLAG is non-nil."
+  (remove-overlays from to 'invisible 'js2-outline)
+  (when flag
+    (let ((o (make-overlay from to)))
+      (overlay-put o 'invisible 'js2-outline)
+      (overlay-put o 'isearch-open-invisible
+                   'js2-isearch-open-invisible)
+      o)))
+
+;; Function to be set as an outline-isearch-open-invisible' property
+;; to the overlay that makes the outline invisible (see
+;; `js2-mode-flag-region').
+(defun js2-isearch-open-invisible (_overlay)
+  ;; We rely on the fact that isearch places point on the matched text.
+  (js2-mode-show-element))
+
+(defun js2-mode-invisible-overlay-bounds (&optional pos)
+  "Return cons cell of bounds of folding overlay at POS.
+Returns nil if not found."
+  (let ((overlays (overlays-at (or pos (point))))
+        o)
+    (while (and overlays
+                (not o))
+      (if (overlay-get (car overlays) 'invisible)
+          (setq o (car overlays))
+        (setq overlays (cdr overlays))))
+    (if o
+        (cons (overlay-start o) (overlay-end o)))))
+
+(defun js2-mode-function-at-point (&optional pos)
+  "Return the innermost function node enclosing current point.
+Returns nil if point is not in a function."
+  (let ((node (js2-node-at-point pos)))
+    (while (and node (not (js2-function-node-p node)))
+      (setq node (js2-node-parent node)))
+    (if (js2-function-node-p node)
+        node)))
+
+(defun js2-mode-toggle-element ()
+  "Hide or show the foldable element at the point."
+  (interactive)
+  (let (comment fn pos)
+    (save-excursion
+      (cond
+       ;; /* ... */ comment?
+       ((js2-block-comment-p (setq comment (js2-comment-at-point)))
+        (if (js2-mode-invisible-overlay-bounds
+             (setq pos (+ 3 (js2-node-abs-pos comment))))
+            (progn
+              (goto-char pos)
+              (js2-mode-show-element))
+          (js2-mode-hide-element)))
+       ;; //-comment?
+       ((save-excursion
+          (back-to-indentation)
+          (looking-at js2-mode-//-comment-re))
+        (js2-mode-toggle-//-comment))
+       ;; function?
+       ((setq fn (js2-mode-function-at-point))
+        (setq pos (and (js2-function-node-body fn)
+                       (js2-node-abs-pos (js2-function-node-body fn))))
+        (goto-char (1+ pos))
+        (if (js2-mode-invisible-overlay-bounds)
+            (js2-mode-show-element)
+          (js2-mode-hide-element)))
+       (t
+        (message "Nothing at point to hide or show"))))))
+
+(defun js2-mode-hide-element ()
+  "Fold/hide contents of a block, showing ellipses.
+Show the hidden text with \\[js2-mode-show-element]."
+  (interactive)
+  (if js2-mode-buffer-dirty-p
+      (js2-mode-wait-for-parse #'js2-mode-hide-element))
+  (let (node body beg end)
+    (cond
+     ((js2-mode-invisible-overlay-bounds)
+      (message "already hidden"))
+     (t
+      (setq node (js2-node-at-point))
+      (cond
+       ((js2-block-comment-p node)
+        (js2-mode-hide-comment node))
+       (t
+        (while (and node (not (js2-function-node-p node)))
+          (setq node (js2-node-parent node)))
+        (if (and node
+                 (setq body (js2-function-node-body node)))
+            (progn
+              (setq beg (js2-node-abs-pos body)
+                    end (+ beg (js2-node-len body)))
+              (js2-mode-flag-region (1+ beg) (1- end) 'hide))
+          (message "No collapsable element found at point"))))))))
+
+(defun js2-mode-show-element ()
+  "Show the hidden element at current point."
+  (interactive)
+  (let ((bounds (js2-mode-invisible-overlay-bounds)))
+    (if bounds
+        (js2-mode-flag-region (car bounds) (cdr bounds) nil)
+      (message "Nothing to un-hide"))))
+
+(defun js2-mode-show-all ()
+  "Show all of the text in the buffer."
+  (interactive)
+  (js2-mode-flag-region (point-min) (point-max) nil))
+
+(defun js2-mode-toggle-hide-functions ()
+  (interactive)
+  (if js2-mode-functions-hidden
+      (js2-mode-show-functions)
+    (js2-mode-hide-functions)))
+
+(defun js2-mode-hide-functions ()
+  "Hides all non-nested function bodies in the buffer.
+Use \\[js2-mode-show-all] to reveal them, or \\[js2-mode-show-element]
+to open an individual entry."
+  (interactive)
+  (if js2-mode-buffer-dirty-p
+      (js2-mode-wait-for-parse #'js2-mode-hide-functions))
+  (if (null js2-mode-ast)
+      (message "Oops - parsing failed")
+    (setq js2-mode-functions-hidden t)
+    (js2-visit-ast js2-mode-ast #'js2-mode-function-hider)))
+
+(defun js2-mode-function-hider (n endp)
+  (when (not endp)
+    (let ((tt (js2-node-type n))
+          body beg end)
+      (cond
+       ((and (= tt js2-FUNCTION)
+             (setq body (js2-function-node-body n)))
+        (setq beg (js2-node-abs-pos body)
+              end (+ beg (js2-node-len body)))
+        (js2-mode-flag-region (1+ beg) (1- end) 'hide)
+        nil)   ; don't process children of function
+       (t
+        t))))) ; keep processing other AST nodes
+
+(defun js2-mode-show-functions ()
+  "Un-hide any folded function bodies in the buffer."
+  (interactive)
+  (setq js2-mode-functions-hidden nil)
+  (save-excursion
+    (goto-char (point-min))
+    (while (/= (goto-char (next-overlay-change (point)))
+               (point-max))
+      (dolist (o (overlays-at (point)))
+        (when (and (overlay-get o 'invisible)
+                   (not (overlay-get o 'comment)))
+          (js2-mode-flag-region (overlay-start o) (overlay-end o) nil))))))
+
+(defun js2-mode-hide-comment (n)
+  (let* ((head (if (eq (js2-comment-node-format n) 'jsdoc)
+                   3  ; /**
+                 2))  ; /*
+         (beg (+ (js2-node-abs-pos n) head))
+         (end (- (+ beg (js2-node-len n)) head 2))
+         (o (js2-mode-flag-region beg end 'hide)))
+    (overlay-put o 'comment t)))
+
+(defun js2-mode-toggle-hide-comments ()
+  "Folds all block comments in the buffer.
+Use \\[js2-mode-show-all] to reveal them, or \\[js2-mode-show-element]
+to open an individual entry."
+  (interactive)
+  (if js2-mode-comments-hidden
+      (js2-mode-show-comments)
+    (js2-mode-hide-comments)))
+
+(defun js2-mode-hide-comments ()
+  (interactive)
+  (if js2-mode-buffer-dirty-p
+      (js2-mode-wait-for-parse #'js2-mode-hide-comments))
+  (if (null js2-mode-ast)
+      (message "Oops - parsing failed")
+    (setq js2-mode-comments-hidden t)
+    (dolist (n (js2-ast-root-comments js2-mode-ast))
+      (when (js2-block-comment-p n)
+        (js2-mode-hide-comment n)))
+    (js2-mode-hide-//-comments)))
+
+(defun js2-mode-extend-//-comment (direction)
+  "Find start or end of a block of similar //-comment lines.
+DIRECTION is -1 to look back, 1 to look forward.
+INDENT is the indentation level to match.
+Returns the end-of-line position of the furthest adjacent
+//-comment line with the same indentation as the current line.
+If there is no such matching line, returns current end of line."
+  (let ((pos (point-at-eol))
+        (indent (current-indentation)))
+    (save-excursion
+      (while (and (zerop (forward-line direction))
+                  (looking-at js2-mode-//-comment-re)
+                  (eq indent (length (match-string 1))))
+        (setq pos (point-at-eol)))
+      pos)))
+
+(defun js2-mode-hide-//-comments ()
+  "Fold adjacent 1-line comments, showing only snippet of first one."
+  (let (beg end)
+    (save-excursion
+      (goto-char (point-min))
+      (while (re-search-forward js2-mode-//-comment-re nil t)
+        (setq beg (point)
+              end (js2-mode-extend-//-comment 1))
+        (unless (eq beg end)
+          (overlay-put (js2-mode-flag-region beg end 'hide)
+                       'comment t))
+        (goto-char end)
+        (forward-char 1)))))
+
+(defun js2-mode-toggle-//-comment ()
+  "Fold or un-fold any multi-line //-comment at point.
+Caller should have determined that this line starts with a //-comment."
+  (let* ((beg (point-at-eol))
+         (end beg))
+    (save-excursion
+      (goto-char end)
+      (if (js2-mode-invisible-overlay-bounds)
+          (js2-mode-show-element)
+        ;; else hide the comment
+        (setq beg (js2-mode-extend-//-comment -1)
+              end (js2-mode-extend-//-comment 1))
+        (unless (eq beg end)
+          (overlay-put (js2-mode-flag-region beg end 'hide)
+                       'comment t))))))
+
+(defun js2-mode-show-comments ()
+  "Un-hide any hidden comments, leaving other hidden elements alone."
+  (interactive)
+  (setq js2-mode-comments-hidden nil)
+  (save-excursion
+    (goto-char (point-min))
+    (while (/= (goto-char (next-overlay-change (point)))
+               (point-max))
+      (dolist (o (overlays-at (point)))
+        (when (overlay-get o 'comment)
+          (js2-mode-flag-region (overlay-start o) (overlay-end o) nil))))))
+
+(defun js2-mode-display-warnings-and-errors ()
+  "Turn on display of warnings and errors."
+  (interactive)
+  (setq js2-mode-show-parse-errors t
+        js2-mode-show-strict-warnings t)
+  (js2-reparse 'force))
+
+(defun js2-mode-hide-warnings-and-errors ()
+  "Turn off display of warnings and errors."
+  (interactive)
+  (setq js2-mode-show-parse-errors nil
+        js2-mode-show-strict-warnings nil)
+  (js2-reparse 'force))
+
+(defun js2-mode-toggle-warnings-and-errors ()
+  "Toggle the display of warnings and errors.
+Some users don't like having warnings/errors reported while they type."
+  (interactive)
+  (setq js2-mode-show-parse-errors (not js2-mode-show-parse-errors)
+        js2-mode-show-strict-warnings (not js2-mode-show-strict-warnings))
+  (if (called-interactively-p 'any)
+      (message "warnings and errors %s"
+               (if js2-mode-show-parse-errors
+                   "enabled"
+                 "disabled")))
+  (js2-reparse 'force))
+
+(defun js2-mode-customize ()
+  (interactive)
+  (customize-group 'js2-mode))
+
+(defun js2-mode-forward-sexp (&optional arg)
+  "Move forward across one statement or balanced expression.
+With ARG, do it that many times.  Negative arg -N means
+move backward across N balanced expressions."
+  (interactive "p")
+  (setq arg (or arg 1))
+  (save-restriction
+    (widen) ;; `blink-matching-open' calls `narrow-to-region'
+    (js2-reparse)
+    (let (forward-sexp-function
+          node (start (point)) pos lp rp child)
+      (cond
+       ;; backward-sexp
+       ;; could probably make this better for some cases:
+       ;;  - if in statement block (e.g. function body), go to parent
+       ;;  - infix exprs like (foo in bar) - maybe go to beginning
+       ;;    of infix expr if in the right-side expression?
+       ((and arg (cl-minusp arg))
+        (dotimes (_ (- arg))
+          (js2-backward-sws)
+          (forward-char -1)   ; Enter the node we backed up to.
+          (when (setq node (js2-node-at-point (point) t))
+            (setq pos (js2-node-abs-pos node))
+            (let ((parens (js2-mode-forward-sexp-parens node pos)))
+              (setq lp (car parens)
+                    rp (cdr parens)))
+            (when (and lp (> start lp))
+              (if (and rp (<= start rp))
+                  ;; Between parens, check if there's a child node we can jump.
+                  (when (setq child (js2-node-closest-child node (point) lp t))
+                    (setq pos (js2-node-abs-pos child)))
+                ;; Before both parens.
+                (setq pos lp)))
+            (let ((state (parse-partial-sexp start pos)))
+              (goto-char (if (not (zerop (car state)))
+                             ;; Stumble at the unbalanced paren if < 0, or
+                             ;; jump a bit further if > 0.
+                             (scan-sexps start -1)
+                           pos))))
+          (unless pos (goto-char (point-min)))))
+       (t
+        ;; forward-sexp
+        (dotimes (_ arg)
+          (js2-forward-sws)
+          (when (setq node (js2-node-at-point (point) t))
+            (setq pos (js2-node-abs-pos node))
+            (let ((parens (js2-mode-forward-sexp-parens node pos)))
+              (setq lp (car parens)
+                    rp (cdr parens)))
+            (or
+             (when (and rp (<= start rp))
+               (if (> start lp)
+                   (when (setq child (js2-node-closest-child node (point) rp))
+                     (setq pos (js2-node-abs-end child)))
+                 (setq pos (1+ rp))))
+             ;; No parens or child nodes, looks for the end of the curren node.
+             (cl-incf pos (js2-node-len
+                           (if (js2-expr-stmt-node-p (js2-node-parent node))
+                               ;; Stop after the semicolon.
+                               (js2-node-parent node)
+                             node))))
+            (let ((state (save-excursion (parse-partial-sexp start pos))))
+              (goto-char (if (not (zerop (car state)))
+                             (scan-sexps start 1)
+                           pos))))
+          (unless pos (goto-char (point-max)))))))))
+
+(defun js2-mode-forward-sexp-parens (node abs-pos)
+  "Return a cons cell with positions of main parens in NODE."
+  (cond
+   ((or (js2-array-node-p node)
+        (js2-object-node-p node)
+        (js2-comp-node-p node)
+        (memq (aref node 0) '(cl-struct-js2-block-node cl-struct-js2-scope)))
+    (cons abs-pos (+ abs-pos (js2-node-len node) -1)))
+   ((js2-paren-expr-node-p node)
+    (let ((lp (js2-node-lp node))
+          (rp (js2-node-rp node)))
+      (cons (when lp (+ abs-pos lp))
+            (when rp (+ abs-pos rp)))))))
+
+(defun js2-node-closest-child (parent point limit &optional before)
+  (let* ((parent-pos (js2-node-abs-pos parent))
+         (rpoint (- point parent-pos))
+         (rlimit (- limit parent-pos))
+         (min (min rpoint rlimit))
+         (max (max rpoint rlimit))
+         found)
+    (catch 'done
+      (js2-visit-ast
+       parent
+       (lambda (node _end-p)
+         (if (eq node parent)
+             t
+           (let ((pos (js2-node-pos node)) ;; Both relative values.
+                 (end (+ (js2-node-pos node) (js2-node-len node))))
+             (when (and (>= pos min) (<= end max)
+                        (if before (< pos rpoint) (> end rpoint)))
+               (setq found node))
+             (when (> end rpoint)
+               (throw 'done nil)))
+           nil))))
+    found))
+
+(defun js2-errors ()
+  "Return a list of errors found."
+  (and js2-mode-ast
+       (js2-ast-root-errors js2-mode-ast)))
+
+(defun js2-warnings ()
+  "Return a list of warnings found."
+  (and js2-mode-ast
+       (js2-ast-root-warnings js2-mode-ast)))
+
+(defun js2-have-errors-p ()
+  "Return non-nil if any parse errors or warnings were found."
+  (or (js2-errors) (js2-warnings)))
+
+(defun js2-errors-and-warnings ()
+  "Return a copy of the concatenated errors and warnings lists.
+They are appended:  first the errors, then the warnings.
+Entries are of the form (MSG BEG END)."
+  (when js2-mode-ast
+    (append (js2-ast-root-errors js2-mode-ast)
+            (copy-sequence (js2-ast-root-warnings js2-mode-ast)))))
+
+(defun js2-next-error (&optional arg reset)
+  "Move to next parse error.
+Typically invoked via \\[next-error].
+ARG is the number of errors, forward or backward, to move.
+RESET means start over from the beginning."
+  (interactive "p")
+  (if (not (or (js2-errors) (js2-warnings)))
+      (message "No errors")
+    (when reset
+      (goto-char (point-min)))
+    (let* ((errs (js2-errors-and-warnings))
+           (continue t)
+           (start (point))
+           (count (or arg 1))
+           (backward (cl-minusp count))
+           (sorter (if backward '> '<))
+           (stopper (if backward '< '>))
+           (count (abs count))
+           all-errs err)
+      ;; Sort by start position.
+      (setq errs (sort errs (lambda (e1 e2)
+                              (funcall sorter (cl-second e1) (cl-second e2))))
+            all-errs errs)
+      ;; Find nth error with pos > start.
+      (while (and errs continue)
+        (when (funcall stopper (cl-cadar errs) start)
+          (setq err (car errs))
+          (if (zerop (cl-decf count))
+              (setq continue nil)))
+        (setq errs (cdr errs)))
+      ;; Clear for `js2-echo-error'.
+      (message nil)
+      (if err
+          (goto-char (cl-second err))
+        ;; Wrap around to first error.
+        (goto-char (cl-second (car all-errs)))
+        ;; If we were already on it, echo msg again.
+        (if (= (point) start)
+            (js2-echo-error (point) (point)))))))
+
+(defun js2-down-mouse-3 ()
+  "Make right-click move the point to the click location.
+This makes right-click context menu operations a bit more intuitive.
+The point will not move if the region is active, however, to avoid
+destroying the region selection."
+  (interactive)
+  (when (and js2-move-point-on-right-click
+             (not mark-active))
+    (let ((e last-input-event))
+      (ignore-errors
+        (goto-char (cl-cadadr e))))))
+
+(defun js2-mode-create-imenu-index ()
+  "Return an alist for `imenu--index-alist'."
+  ;; This is built up in `js2-parse-record-imenu' during parsing.
+  (when js2-mode-ast
+    ;; if we have an ast but no recorder, they're requesting a rescan
+    (unless js2-imenu-recorder
+      (js2-reparse 'force))
+    (prog1
+        (js2-build-imenu-index)
+      (setq js2-imenu-recorder nil
+            js2-imenu-function-map nil))))
+
+(defun js2-mode-find-tag ()
+  "Replacement for `find-tag-default'.
+`find-tag-default' returns a ridiculous answer inside comments."
+  (let (beg end)
+    (js2-with-underscore-as-word-syntax
+      (save-excursion
+        (if (and (not (looking-at "[[:alnum:]_$]"))
+                 (looking-back "[[:alnum:]_$]"))
+            (setq beg (progn (forward-word -1) (point))
+                  end (progn (forward-word 1) (point)))
+          (setq beg (progn (forward-word 1) (point))
+                end (progn (forward-word -1) (point))))
+        (replace-regexp-in-string
+         "[\"']" ""
+         (buffer-substring-no-properties beg end))))))
+
+(defun js2-mode-forward-sibling ()
+  "Move to the end of the sibling following point in parent.
+Returns non-nil if successful, or nil if there was no following sibling."
+  (let* ((node (js2-node-at-point))
+         (parent (js2-mode-find-enclosing-fn node))
+         sib)
+    (when (setq sib (js2-node-find-child-after (point) parent))
+      (goto-char (+ (js2-node-abs-pos sib)
+                    (js2-node-len sib))))))
+
+(defun js2-mode-backward-sibling ()
+  "Move to the beginning of the sibling node preceding point in parent.
+Parent is defined as the enclosing script or function."
+  (let* ((node (js2-node-at-point))
+         (parent (js2-mode-find-enclosing-fn node))
+         sib)
+    (when (setq sib (js2-node-find-child-before (point) parent))
+      (goto-char (js2-node-abs-pos sib)))))
+
+(defun js2-beginning-of-defun (&optional arg)
+  "Go to line on which current function starts, and return t on success.
+If we're not in a function or already at the beginning of one, go
+to beginning of previous script-level element.
+With ARG N, do that N times. If N is negative, move forward."
+  (setq arg (or arg 1))
+  (if (cl-plusp arg)
+      (let ((parent (js2-node-parent-script-or-fn (js2-node-at-point))))
+        (when (cond
+               ((js2-function-node-p parent)
+                (goto-char (js2-node-abs-pos parent)))
+               (t
+                (js2-mode-backward-sibling)))
+          (if (> arg 1)
+              (js2-beginning-of-defun (1- arg))
+            t)))
+    (when (js2-end-of-defun)
+      (js2-beginning-of-defun (if (>= arg -1) 1 (1+ arg))))))
+
+(defun js2-end-of-defun ()
+  "Go to the char after the last position of the current function
+or script-level element."
+  (let* ((node (js2-node-at-point))
+         (parent (or (and (js2-function-node-p node) node)
+                     (js2-node-parent-script-or-fn node)))
+         script)
+    (unless (js2-function-node-p parent)
+      ;; Use current script-level node, or, if none, the next one.
+      (setq script (or parent node)
+            parent (js2-node-find-child-before (point) script))
+      (when (or (null parent)
+                (>= (point) (+ (js2-node-abs-pos parent)
+                               (js2-node-len parent))))
+        (setq parent (js2-node-find-child-after (point) script))))
+    (when parent
+      (goto-char (+ (js2-node-abs-pos parent)
+                    (js2-node-len parent))))))
+
+(defun js2-mark-defun (&optional allow-extend)
+  "Put mark at end of this function, point at beginning.
+The function marked is the one that contains point.
+
+Interactively, if this command is repeated,
+or (in Transient Mark mode) if the mark is active,
+it marks the next defun after the ones already marked."
+  (interactive "p")
+  (let (extended)
+    (when (and allow-extend
+               (or (and (eq last-command this-command) (mark t))
+                   (and transient-mark-mode mark-active)))
+      (let ((sib (save-excursion
+                   (goto-char (mark))
+                   (if (js2-mode-forward-sibling)
+                       (point)))))
+        (if sib
+            (progn
+              (set-mark sib)
+              (setq extended t))
+          ;; no more siblings - try extending to enclosing node
+          (goto-char (mark t)))))
+   (when (not extended)
+     (let ((node (js2-node-at-point (point) t)) ; skip comments
+           ast fn stmt parent beg end)
+       (when (js2-ast-root-p node)
+         (setq ast node
+               node (or (js2-node-find-child-after (point) node)
+                        (js2-node-find-child-before (point) node))))
+       ;; only mark whole buffer if we can't find any children
+       (if (null node)
+           (setq node ast))
+       (if (js2-function-node-p node)
+           (setq parent node)
+         (setq fn (js2-mode-find-enclosing-fn node)
+               stmt (if (or (null fn)
+                            (js2-ast-root-p fn))
+                        (js2-mode-find-first-stmt node))
+               parent (or stmt fn)))
+       (setq beg (js2-node-abs-pos parent)
+             end (+ beg (js2-node-len parent)))
+       (push-mark beg)
+       (goto-char end)
+       (exchange-point-and-mark)))))
+
+(defun js2-narrow-to-defun ()
+  "Narrow to the function enclosing point."
+  (interactive)
+  (let* ((node (js2-node-at-point (point) t))  ; skip comments
+         (fn (if (js2-script-node-p node)
+                 node
+               (js2-mode-find-enclosing-fn node)))
+         (beg (js2-node-abs-pos fn)))
+    (unless (js2-ast-root-p fn)
+      (narrow-to-region beg (+ beg (js2-node-len fn))))))
+
+(provide 'js2-mode)
+
+;;; js2-mode.el ends here
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diff --git a/packages/context-coloring/test/context-coloring-test.el b/packages/context-coloring/test/context-coloring-test.el
new file mode 100644
index 0000000..4c62d7a
--- /dev/null
+++ b/packages/context-coloring/test/context-coloring-test.el
@@ -0,0 +1,375 @@
+;;; test/context-coloring-test.el --- Tests for context coloring. -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014-2015  Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+;;; Test running utilities
+
+(defconst context-coloring-test-path
+  (file-name-directory (or load-file-name buffer-file-name))
+  "This file's directory.")
+
+(defun context-coloring-test-read-file (path)
+  "Read a file's contents into a string."
+  (with-temp-buffer
+    (insert-file-contents (expand-file-name path context-coloring-test-path))
+    (buffer-string)))
+
+(defun context-coloring-test-setup ()
+  "Preparation code to run before all tests."
+  (setq context-coloring-comments-and-strings nil))
+
+(defun context-coloring-test-cleanup ()
+  "Cleanup code to run after all tests."
+  (setq context-coloring-comments-and-strings t)
+  (setq context-coloring-after-colorize-hook nil)
+  (setq context-coloring-js-block-scopes nil)
+  (context-coloring-set-colors-default))
+
+(defmacro context-coloring-test-with-fixture (fixture &rest body)
+  "Evaluate BODY in a temporary buffer with the relative
+FIXTURE."
+  `(with-temp-buffer
+     (unwind-protect
+         (progn
+           (context-coloring-test-setup)
+           (insert (context-coloring-test-read-file ,fixture))
+           ,@body)
+       (context-coloring-test-cleanup))))
+
+(defun context-coloring-test-with-temp-buffer-async (callback)
+  "Create a temporary buffer, and evaluate CALLBACK there.  A
+teardown callback is passed to CALLBACK for it to invoke when it
+is done."
+  (let ((temp-buffer (make-symbol "temp-buffer")))
+    (let ((previous-buffer (current-buffer))
+          (temp-buffer (generate-new-buffer " *temp*")))
+      (set-buffer temp-buffer)
+      (funcall
+       callback
+       (lambda ()
+         (and (buffer-name temp-buffer)
+              (kill-buffer temp-buffer))
+         (set-buffer previous-buffer))))))
+
+(defun context-coloring-test-with-fixture-async (fixture callback &optional setup)
+  "Evaluate CALLBACK in a temporary buffer with the relative
+FIXTURE.  A teardown callback is passed to CALLBACK for it to
+invoke when it is done.  An optional SETUP callback can be passed
+to run arbitrary code before the mode is invoked."
+  (context-coloring-test-with-temp-buffer-async
+   (lambda (done-with-temp-buffer)
+     (context-coloring-test-setup)
+     (if setup (funcall setup))
+     (insert (context-coloring-test-read-file fixture))
+     (funcall
+      callback
+      (lambda ()
+        (context-coloring-test-cleanup)
+        (funcall done-with-temp-buffer))))))
+
+
+;;; Test defining utilities
+
+(defun context-coloring-test-js-mode (fixture callback &optional setup)
+  "Use FIXTURE as the subject matter for test logic in CALLBACK.
+Optionally, provide setup code to run before the mode is
+instantiated in SETUP."
+  (context-coloring-test-with-fixture-async
+   fixture
+   (lambda (done-with-test)
+     (js-mode)
+     (context-coloring-mode)
+     (context-coloring-colorize
+      (lambda ()
+        (funcall callback done-with-test))))
+   setup))
+
+(defmacro context-coloring-test-js2-mode (fixture &rest body)
+  "Use FIXTURE as the subject matter for test logic in BODY."
+  `(context-coloring-test-with-fixture
+    ,fixture
+    (require 'js2-mode)
+    (setq js2-mode-show-parse-errors nil)
+    (setq js2-mode-show-strict-warnings nil)
+    (js2-mode)
+    (context-coloring-mode)
+    ,@body))
+
+(defmacro context-coloring-test-deftest-js-mode (name)
+  "Define an asynchronous test for `js-mode' in the typical
+format."
+  (let ((test-name (intern (format "context-coloring-test-js-mode-%s" name)))
+        (fixture (format "./fixtures/%s.js" name))
+        (function-name (intern-soft (format "context-coloring-test-js-%s" name))))
+    `(ert-deftest-async ,test-name (done)
+                        (context-coloring-test-js-mode
+                         ,fixture
+                         (lambda (teardown)
+                           (unwind-protect
+                               (,function-name)
+                             (funcall teardown))
+                           (funcall done))))))
+
+(defmacro context-coloring-test-deftest-js2-mode (name)
+    "Define a test for `js2-mode' in the typical format."
+  (let ((test-name (intern (format "context-coloring-test-js2-mode-%s" name)))
+        (fixture (format "./fixtures/%s.js" name))
+        (function-name (intern-soft (format "context-coloring-test-js-%s" name))))
+    `(ert-deftest ,test-name ()
+       (context-coloring-test-js2-mode
+        ,fixture
+        (,function-name)))))
+
+
+;;; Assertion functions
+
+(defmacro context-coloring-test-assert-region (&rest body)
+  "Skeleton for asserting something about the face of points in a
+region.  Provides the free variables `i', `length', `point',
+`face' and `actual-level'."
+  `(let ((i 0)
+         (length (- end start)))
+     (while (< i length)
+       (let* ((point (+ i start))
+              (face (get-text-property point 'face))
+              actual-level)
+         ,@body)
+       (setq i (+ i 1)))))
+
+(defconst context-coloring-test-level-regexp
+  "context-coloring-level-\\([[:digit:]]+\\)-face"
+  "Regular expression for extracting a level from a face.")
+
+(defun context-coloring-test-assert-region-level (start end level)
+  "Assert that all points in the range [START, END) are of level
+LEVEL."
+  (context-coloring-test-assert-region
+   (when (not (when face
+                (let* ((face-string (symbol-name face))
+                       (matches (string-match
+                                 context-coloring-test-level-regexp
+                                 face-string)))
+                  (when matches
+                    (setq actual-level (string-to-number
+                                        (substring face-string
+                                                   (match-beginning 1)
+                                                   (match-end 1))))
+                    (= level actual-level)))))
+     (ert-fail (format (concat "Expected level in region [%s, %s), "
+                               "which is \"%s\", to be %s; "
+                               "but at point %s, it was %s")
+                       start end
+                       (buffer-substring-no-properties start end) level
+                       point actual-level)))))
+
+(defun context-coloring-test-assert-region-face (start end expected-face)
+  "Assert that all points in the range [START, END) have the face
+EXPECTED-FACE."
+  (context-coloring-test-assert-region
+   (when (not (eq face expected-face))
+     (ert-fail (format (concat "Expected face in region [%s, %s), "
+                               "which is \"%s\", to be %s; "
+                               "but at point %s, it was %s")
+                       start end
+                       (buffer-substring-no-properties start end) expected-face
+                       point face)))))
+
+(defun context-coloring-test-assert-region-comment-delimiter (start end)
+  "Assert that all points in the range [START, END) have
+`font-lock-comment-delimiter-face'."
+  (context-coloring-test-assert-region-face
+   start end 'font-lock-comment-delimiter-face))
+
+(defun context-coloring-test-assert-region-comment (start end)
+    "Assert that all points in the range [START, END) have
+`font-lock-comment-face'."
+  (context-coloring-test-assert-region-face
+   start end 'font-lock-comment-face))
+
+(defun context-coloring-test-assert-region-string (start end)
+    "Assert that all points in the range [START, END) have
+`font-lock-string-face'."
+  (context-coloring-test-assert-region-face
+   start end 'font-lock-string-face))
+
+(defun context-coloring-test-assert-message (expected)
+  "Assert that the *Messages* buffer has message EXPECTED."
+  (with-current-buffer "*Messages*"
+    (let ((messages (split-string
+                     (buffer-substring-no-properties
+                      (point-min)
+                      (point-max))
+                     "\n")))
+      (let ((message (car (nthcdr (- (length messages) 2) messages))))
+        (should (equal message expected))))))
+
+(defun context-coloring-test-assert-face (level foreground)
+  "Assert that a face for LEVEL exists and that its `:foreground'
+is FOREGROUND."
+  (let* ((face (context-coloring-face-symbol level))
+         actual-foreground)
+    (when (not face)
+      (ert-fail (format (concat "Expected face for level `%s' to exist; "
+                                "but it didn't")
+                        level)))
+    (setq actual-foreground (face-attribute face :foreground))
+    (when (not (string-equal foreground actual-foreground))
+      (ert-fail (format (concat "Expected face for level `%s' "
+                                "to have foreground `%s'; but it was `%s'")
+                        level
+                        foreground actual-foreground)))))
+
+
+;;; The tests
+
+(ert-deftest context-coloring-test-unsupported-mode ()
+  (context-coloring-test-with-fixture
+   "./fixtures/function-scopes.js"
+   (context-coloring-mode)
+   (context-coloring-test-assert-message
+    "Context coloring is not available for this major mode")))
+
+(ert-deftest context-coloring-test-set-colors ()
+  ;; This test has an irreversible side-effect in that it defines faces beyond
+  ;; 7. Faces 0 through 7 are reset to their default states, so it might not
+  ;; matter, but be aware anyway.
+  (context-coloring-set-colors
+   "#000000"
+   "#111111"
+   "#222222"
+   "#333333"
+   "#444444"
+   "#555555"
+   "#666666"
+   "#777777"
+   "#888888"
+   "#999999")
+  (context-coloring-test-assert-face 0 "#000000")
+  (context-coloring-test-assert-face 1 "#111111")
+  (context-coloring-test-assert-face 2 "#222222")
+  (context-coloring-test-assert-face 3 "#333333")
+  (context-coloring-test-assert-face 4 "#444444")
+  (context-coloring-test-assert-face 5 "#555555")
+  (context-coloring-test-assert-face 6 "#666666")
+  (context-coloring-test-assert-face 7 "#777777")
+  (context-coloring-test-assert-face 8 "#888888")
+  (context-coloring-test-assert-face 9 "#999999"))
+
+(defun context-coloring-test-js-function-scopes ()
+  (context-coloring-test-assert-region-level 1 9 0)
+  (context-coloring-test-assert-region-level 9 23 1)
+  (context-coloring-test-assert-region-level 23 25 0)
+  (context-coloring-test-assert-region-level 25 34 1)
+  (context-coloring-test-assert-region-level 34 35 0)
+  (context-coloring-test-assert-region-level 35 52 1)
+  (context-coloring-test-assert-region-level 52 66 2)
+  (context-coloring-test-assert-region-level 66 72 1)
+  (context-coloring-test-assert-region-level 72 81 2)
+  (context-coloring-test-assert-region-level 81 82 1)
+  (context-coloring-test-assert-region-level 82 87 2)
+  (context-coloring-test-assert-region-level 87 89 1))
+
+(context-coloring-test-deftest-js-mode function-scopes)
+(context-coloring-test-deftest-js2-mode function-scopes)
+
+(defun context-coloring-test-js-global ()
+  (context-coloring-test-assert-region-level 20 28 1)
+  (context-coloring-test-assert-region-level 28 35 0)
+  (context-coloring-test-assert-region-level 35 41 1))
+
+(context-coloring-test-deftest-js-mode global)
+(context-coloring-test-deftest-js2-mode global)
+
+(defun context-coloring-test-js-block-scopes ()
+  (context-coloring-test-assert-region-level 20 64 1)
+   (setq context-coloring-js-block-scopes t)
+   (context-coloring-colorize)
+   (context-coloring-test-assert-region-level 20 27 1)
+   (context-coloring-test-assert-region-level 27 41 2)
+   (context-coloring-test-assert-region-level 41 42 1)
+   (context-coloring-test-assert-region-level 42 64 2))
+
+(context-coloring-test-deftest-js2-mode block-scopes)
+
+(defun context-coloring-test-js-catch ()
+  (context-coloring-test-assert-region-level 20 27 1)
+  (context-coloring-test-assert-region-level 27 51 2)
+  (context-coloring-test-assert-region-level 51 52 1)
+  (context-coloring-test-assert-region-level 52 73 2)
+  (context-coloring-test-assert-region-level 73 101 3)
+  (context-coloring-test-assert-region-level 101 102 1)
+  (context-coloring-test-assert-region-level 102 117 3)
+  (context-coloring-test-assert-region-level 117 123 2))
+
+(context-coloring-test-deftest-js-mode catch)
+(context-coloring-test-deftest-js2-mode catch)
+
+(defun context-coloring-test-js-key-names ()
+  (context-coloring-test-assert-region-level 20 63 1))
+
+(context-coloring-test-deftest-js-mode key-names)
+(context-coloring-test-deftest-js2-mode key-names)
+
+(defun context-coloring-test-js-property-lookup ()
+  (context-coloring-test-assert-region-level 20 26 0)
+  (context-coloring-test-assert-region-level 26 38 1)
+  (context-coloring-test-assert-region-level 38 44 0)
+  (context-coloring-test-assert-region-level 44 52 1)
+  (context-coloring-test-assert-region-level 57 63 0)
+  (context-coloring-test-assert-region-level 63 74 1))
+
+(context-coloring-test-deftest-js-mode property-lookup)
+(context-coloring-test-deftest-js2-mode property-lookup)
+
+(defun context-coloring-test-js-key-values ()
+  (context-coloring-test-assert-region-level 78 79 1))
+
+(context-coloring-test-deftest-js-mode key-values)
+(context-coloring-test-deftest-js2-mode key-values)
+
+(defun context-coloring-test-js-comments-and-strings ()
+  (context-coloring-test-assert-region-comment-delimiter 1 4)
+  (context-coloring-test-assert-region-comment 4 8)
+  (context-coloring-test-assert-region-comment-delimiter 9 12)
+  (context-coloring-test-assert-region-comment 12 19)
+  (context-coloring-test-assert-region-string 20 32)
+  (context-coloring-test-assert-region-level 32 33 0))
+
+(ert-deftest-async context-coloring-test-js-mode-comments-and-strings (done)
+  (context-coloring-test-js-mode
+   "./fixtures/comments-and-strings.js"
+   (lambda (teardown)
+     (unwind-protect
+         (context-coloring-test-js-comments-and-strings)
+       (funcall teardown))
+     (funcall done))
+   (lambda ()
+     (setq context-coloring-comments-and-strings t))))
+
+(ert-deftest context-coloring-test-js2-mode-comments-and-strings ()
+  (context-coloring-test-js2-mode
+   "./fixtures/comments-and-strings.js"
+   (setq context-coloring-comments-and-strings t)
+   (context-coloring-colorize)
+   (context-coloring-test-js-comments-and-strings)))
+
+(provide 'context-coloring-test)
+
+;;; context-coloring-test.el ends here
diff --git a/packages/context-coloring/test/fixtures/block-scopes.js b/packages/context-coloring/test/fixtures/block-scopes.js
new file mode 100644
index 0000000..735ca6f
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/block-scopes.js
@@ -0,0 +1,6 @@
+(function () {
+    if (1) {
+        var a;
+        let b;
+    }
+}());
diff --git a/packages/context-coloring/test/fixtures/catch.js b/packages/context-coloring/test/fixtures/catch.js
new file mode 100644
index 0000000..a542ce9
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/catch.js
@@ -0,0 +1,8 @@
+(function () {
+    try {} catch (e) {
+        var a = e;
+        try {} catch (e) {
+            var a = e;
+        }
+    }
+}());
diff --git a/packages/context-coloring/test/fixtures/comments-and-strings.js b/packages/context-coloring/test/fixtures/comments-and-strings.js
new file mode 100644
index 0000000..9910b02
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/comments-and-strings.js
@@ -0,0 +1,3 @@
+// Foo.
+/* Bar. */
+'use strict';
diff --git a/packages/context-coloring/test/fixtures/function-scopes.js b/packages/context-coloring/test/fixtures/function-scopes.js
new file mode 100644
index 0000000..2f6ed32
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/function-scopes.js
@@ -0,0 +1,5 @@
+var a = function () {};
+function b() {
+    var c = function () {};
+    function d() {}
+}
diff --git a/packages/context-coloring/test/fixtures/global.js b/packages/context-coloring/test/fixtures/global.js
new file mode 100644
index 0000000..a35619d
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/global.js
@@ -0,0 +1,3 @@
+(function () {
+    var a = require('a');
+}());
diff --git a/packages/context-coloring/test/fixtures/key-names.js b/packages/context-coloring/test/fixtures/key-names.js
new file mode 100644
index 0000000..d8ad17c
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/key-names.js
@@ -0,0 +1,6 @@
+(function () {
+    return {
+        a: 0,
+        b : 2
+    };
+}());
diff --git a/packages/context-coloring/test/fixtures/key-values.js b/packages/context-coloring/test/fixtures/key-values.js
new file mode 100644
index 0000000..41bdedd
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/key-values.js
@@ -0,0 +1,8 @@
+(function () {
+    var a;
+    (function () {
+        return {
+            b: a
+        };
+    }());
+}());
diff --git a/packages/context-coloring/test/fixtures/property-lookup.js b/packages/context-coloring/test/fixtures/property-lookup.js
new file mode 100644
index 0000000..4edcb41
--- /dev/null
+++ b/packages/context-coloring/test/fixtures/property-lookup.js
@@ -0,0 +1,5 @@
+(function () {
+    window.foo();
+    window. bar();
+    window.foo.bar();
+}());
-- 
1.9.1