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master 7f2fb99211: char-uppercase-p: New predicate
From: |
Tino Calancha |
Subject: |
master 7f2fb99211: char-uppercase-p: New predicate |
Date: |
Wed, 11 May 2022 12:04:18 -0400 (EDT) |
branch: master
commit 7f2fb992110a60a8b583db76fd3b3ee0f1c7efb9
Author: Tino Calancha <tino.calancha@gmail.com>
Commit: Tino Calancha <tino.calancha@gmail.com>
char-uppercase-p: New predicate
Return non-nil if its argument is an uppercase character.
Suggested in Bug#54804.
* lisp/subr.el (char-uppercase-p): New defun.
* etc/NEWS (Lisp Changes in Emacs 29.1): Announce it
* doc/lispref/display.texi (Size of Displayed Text): Document it.
* test/lisp/subr-tests.el (test-char-uppercase-p): Add a test.
---
doc/lispref/display.texi | 5 +++++
etc/NEWS | 5 ++++-
lisp/simple.el | 8 ++++++++
test/lisp/subr-tests.el | 7 +++++++
4 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 0ab683d234..f428fb858b 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -2010,6 +2010,11 @@ Tables}). The width of a tab character is usually
@code{tab-width}
(@pxref{Usual Display}).
@end defun
+@defun char-uppercase-p char
+Return non-@code{nil} if @var{char} is an uppercase character
+according to Unicode.
+@end defun
+
@defun string-width string &optional from to
This function returns the width in columns of the string @var{string},
if it were displayed in the current buffer and the selected window.
diff --git a/etc/NEWS b/etc/NEWS
index 991088a067..ddb83ce410 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1781,6 +1781,10 @@ functions.
* Lisp Changes in Emacs 29.1
++++
+** New predicate 'char-uppercase-p'.
+This returns non-nil if its argument its an uppercase character.
+
** Byte compilation
---
@@ -1793,7 +1797,6 @@ I.e., double-quoting the 'bar', which is almost never the
correct
value. The byte compiler will now issue a warning if it encounters
these forms.
-
+++
*** 'restore-buffer-modified-p' can now alter buffer auto-save state.
With a FLAG value of 'autosaved', it will mark the buffer as having
diff --git a/lisp/simple.el b/lisp/simple.el
index 89fb0ea97e..3812f6d8c6 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -6054,6 +6054,14 @@ and KILLP is t if a prefix arg was specified."
;; Avoid warning about delete-backward-char
(with-no-warnings (delete-backward-char n killp))))
+(defun char-uppercase-p (char)
+ "Return non-nil if CHAR is an upper-case character.
+If the Unicode tables are not yet available, e.g. during bootstrap,
+then gives correct answers only for ASCII characters."
+ (cond ((unicode-property-table-internal 'lowercase)
+ (characterp (get-char-code-property char 'lowercase)))
+ ((and (>= char ?A) (<= char ?Z)))))
+
(defun zap-to-char (arg char)
"Kill up to and including ARGth occurrence of CHAR.
Case is ignored if `case-fold-search' is non-nil in the current buffer.
diff --git a/test/lisp/subr-tests.el b/test/lisp/subr-tests.el
index 89803e5ce2..a25eb363b0 100644
--- a/test/lisp/subr-tests.el
+++ b/test/lisp/subr-tests.el
@@ -1074,5 +1074,12 @@ final or penultimate step during initialization."))
(should (= subr-test--local 2))
(should-not (boundp 'subr-test--unexist)))))
+(ert-deftest test-char-uppercase-p ()
+ "Tests for `char-uppercase-p'."
+ (dolist (c (list ?R ?S ?Ω ?Ψ))
+ (should (char-uppercase-p c)))
+ (dolist (c (list ?a ?b ?α ?β))
+ (should-not (char-uppercase-p c))))
+
(provide 'subr-tests)
;;; subr-tests.el ends here
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