GNU bug report logs - #74307
30.0.92; emacs-lisp font-locking word regexp

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#74308: closed (30.0.92; emacs-lisp font-locking word regexp)
Date: Sat, 16 Nov 2024 14:24:02 +0000

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Your message dated Sat, 16 Nov 2024 16:22:55 +0200
with message-id <865xongsw0.fsf <at> gnu.org>
and subject line Re: bug#74307: 30.0.92; emacs-lisp font-locking word regexp
has caused the debbugs.gnu.org bug report #74307,
regarding 30.0.92; emacs-lisp font-locking word regexp
to be marked as done.

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From: Roland Winkler <winkler <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.92; emacs-lisp font-locking word regexp
Date: Mon, 11 Nov 2024 00:30:46 -0600

Starting from emacs -Q, put the following into a buffer with
emacs-lisp-mode

  (setq foo "\\<foo\\>")

The part "foo\\" of the string "\\<foo\\>" will get
font-lock-variable-name-face, which looks odd.

I believe, this is due to a clause in lisp-mode.el that says

         ;; Words inside \\[], \\<>, \\{} or \\`' tend to be for
         ;; `substitute-command-keys'.

But this assumption is not always correct, in particular if ">" is
preceded by "\\", which happens when constructing regexps.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 74307-done <at> debbugs.gnu.org, winkler <at> gnu.org
Subject: Re: bug#74307: 30.0.92; emacs-lisp font-locking word regexp
Date: Sat, 16 Nov 2024 16:22:55 +0200

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: Roland Winkler <winkler <at> gnu.org>,  74307 <at> debbugs.gnu.org
> Date: Thu, 14 Nov 2024 11:24:48 -0500
> 
> > I believe you are saying that in
> >
> >          (,(rx "\\\\" (or (seq "<" (group-n 1 lisp-mode-symbol) ">")
> >                           (seq "{" (group-n 1 lisp-mode-symbol) "}")))
> >           (1 font-lock-variable-name-face prepend))
> >
> > we should use something like the below instead?
> >
> >      (,(rx "\\\\" (or (seq "<" (group-n 1 lisp-mode-symbol) (not "\\\\") ">")
> >                       (seq "{" (group-n 1 lisp-mode-symbol) (not "\\\\") "}"))
> >
> > And similarly for \\[] etc.?
> 
> Sounds good to me.

Thanks, installed on master, and closing the bug.

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