[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
master dedd19a2f5: Add new type predicate plistp
From: |
Lars Ingebrigtsen |
Subject: |
master dedd19a2f5: Add new type predicate plistp |
Date: |
Mon, 27 Jun 2022 06:37:34 -0400 (EDT) |
branch: master
commit dedd19a2f5cbf16c8ac8a122b0c39ee4e178b9e8
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>
Add new type predicate plistp
* lisp/subr.el (plistp): New type predicate (bug#47427). This
referred to in the error message from plist-put: "Debugger
entered--Lisp error: (wrong-type-argument plistp (a b c))".
---
lisp/subr.el | 6 ++++++
test/lisp/subr-tests.el | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/lisp/subr.el b/lisp/subr.el
index b05471f0c3..69cff23cba 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -4006,6 +4006,12 @@ Otherwise, return nil."
(setq object (indirect-function object)))
(and (subrp object) (eq (cdr (subr-arity object)) 'unevalled)))
+(defun plistp (object)
+ "Non-nil if and only if OBJECT is a valid plist."
+ (and (listp object)
+ (proper-list-p object)
+ (zerop (mod (length object) 2))))
+
(defun macrop (object)
"Non-nil if and only if OBJECT is a macro."
(let ((def (indirect-function object)))
diff --git a/test/lisp/subr-tests.el b/test/lisp/subr-tests.el
index 45dd2d7160..ced2bc5c4e 100644
--- a/test/lisp/subr-tests.el
+++ b/test/lisp/subr-tests.el
@@ -1081,5 +1081,14 @@ final or penultimate step during initialization."))
(dolist (c (list ?a ?b ?α ?β))
(should-not (char-uppercase-p c))))
+(ert-deftest test-plistp ()
+ (should (plistp nil))
+ (should-not (plistp 1))
+ (should (plistp '(1 2)))
+ (should-not (plistp '(1 . 2)))
+ (should (plistp '(1 2 3 4)))
+ (should-not (plistp '(1 2 3)))
+ (should-not (plistp '(1 2 3 . 4))))
+
(provide 'subr-tests)
;;; subr-tests.el ends here
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- master dedd19a2f5: Add new type predicate plistp,
Lars Ingebrigtsen <=