Re: [FEATURE] List all available languages

[Mark H Weaver]

I wrote:
> How about adding a new boolean field to <language> that marks it as
> "internal" or something to that effect?  We could have it default to #f
> for backward compatibility, and mark our internal languages as #t.

I've attached a proposed patch to add this field.  Thoughts?

    Mark


>From 605cbde174afa52d4ccfd8528ef6903ad98a8002 Mon Sep 17 00:00:00 2001
From: Mark H Weaver <address@hidden>
Date: Fri, 25 Jan 2013 17:44:14 -0500
Subject: [PATCH] Add 'internal-only?' flag to <language> specifications.

* module/system/base/language.scm (<language>): Add 'internal-only?'
  field, and export new 'language-internal-only?' predicate.

* doc/ref/compiler.texi (Compiler Tower): Document.

* module/language/assembly/spec.scm, module/language/bytecode/spec.scm,
  module/language/glil/spec.scm, module/language/objcode/spec.scm,
  module/language/tree-il/spec.scm, module/language/value/spec.scm:
  Mark these languages as 'internal-only?'.
---
 doc/ref/compiler.texi             |    3 ++-
 module/language/assembly/spec.scm |    1 +
 module/language/bytecode/spec.scm |    1 +
 module/language/glil/spec.scm     |    4 +++-
 module/language/objcode/spec.scm  |    1 +
 module/language/tree-il/spec.scm  |    1 +
 module/language/value/spec.scm    |    1 +
 module/system/base/language.scm   |    4 +++-
 8 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/doc/ref/compiler.texi b/doc/ref/compiler.texi
index a88942d..46cde8c 100644
--- a/doc/ref/compiler.texi
+++ b/doc/ref/compiler.texi
@@ -55,7 +55,8 @@ They are registered with the @code{define-language} form.
 @deffn {Scheme Syntax} define-language @
 name title reader printer @
 [parser=#f] [compilers='()] [decompilers='()] [evaluator=#f] @
-[joiner=#f] [make-default-environment=make-fresh-user-module]
+[joiner=#f] [internal-only?=#f] @
+[make-default-environment=make-fresh-user-module]
 Define a language.
 
 This syntax defines a @code{#<language>} object, bound to @var{name}
diff --git a/module/language/assembly/spec.scm 
b/module/language/assembly/spec.scm
index 01a55c4..a5efcb7 100644
--- a/module/language/assembly/spec.scm
+++ b/module/language/assembly/spec.scm
@@ -31,4 +31,5 @@
   #:parser      read ;; fixme: make a verifier?
   #:compilers   `((bytecode . ,compile-bytecode))
   #:decompilers `((bytecode . ,decompile-bytecode))
+  #:internal-only? #t
   )
diff --git a/module/language/bytecode/spec.scm 
b/module/language/bytecode/spec.scm
index 57ccd71..af2f9c7 100644
--- a/module/language/bytecode/spec.scm
+++ b/module/language/bytecode/spec.scm
@@ -35,4 +35,5 @@
   #:printer    write
   #:compilers   `((objcode . ,compile-objcode))
   #:decompilers `((objcode . ,decompile-objcode))
+  #:internal-only? #t
   )
diff --git a/module/language/glil/spec.scm b/module/language/glil/spec.scm
index a8164e5..3faa9b9 100644
--- a/module/language/glil/spec.scm
+++ b/module/language/glil/spec.scm
@@ -37,4 +37,6 @@
   #:printer    write-glil
   #:parser      parse-glil
   #:compilers   `((assembly . ,compile-asm))
-  #:decompilers `((assembly . ,decompile-assembly)))
+  #:decompilers `((assembly . ,decompile-assembly))
+  #:internal-only? #t
+  )
diff --git a/module/language/objcode/spec.scm b/module/language/objcode/spec.scm
index 7cc85b7..a17166a 100644
--- a/module/language/objcode/spec.scm
+++ b/module/language/objcode/spec.scm
@@ -79,4 +79,5 @@
   #:printer    write-objcode
   #:compilers   `((value . ,objcode->value))
   #:decompilers `((value . ,decompile-value))
+  #:internal-only? #t
   )
diff --git a/module/language/tree-il/spec.scm b/module/language/tree-il/spec.scm
index 38e6d31..eae93b6 100644
--- a/module/language/tree-il/spec.scm
+++ b/module/language/tree-il/spec.scm
@@ -42,4 +42,5 @@
   #:parser      parse-tree-il
   #:joiner      join
   #:compilers   `((glil . ,compile-glil))
+  #:internal-only? #t
   )
diff --git a/module/language/value/spec.scm b/module/language/value/spec.scm
index 6c6cff9..26823ca 100644
--- a/module/language/value/spec.scm
+++ b/module/language/value/spec.scm
@@ -26,4 +26,5 @@
   #:title      "Values"
   #:reader     #f
   #:printer    write
+  #:internal-only? #t
   )
diff --git a/module/system/base/language.scm b/module/system/base/language.scm
index 81b43b7..8949c05 100644
--- a/module/system/base/language.scm
+++ b/module/system/base/language.scm
@@ -25,7 +25,8 @@
             language-name language-title language-reader
             language-printer language-parser 
             language-compilers language-decompilers language-evaluator
-            language-joiner language-make-default-environment
+            language-joiner language-internal-only?
+            language-make-default-environment
 
             lookup-compilation-order lookup-decompilation-order
             invalidate-compilation-cache! default-environment
@@ -49,6 +50,7 @@
   (decompilers '())
   (evaluator #f)
   (joiner #f)
+  (internal-only? #f)
   (make-default-environment make-fresh-user-module))
 
 (define-macro (define-language name . spec)
-- 
1.7.10.4