GNU bug report logs - #8509
24.0.50; cperl-mode with which-function-mode breaks font-locking

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Frank Terbeck <ft <at> bewatermyfriend.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; cperl-mode with which-function-mode breaks font-locking
Date: Sat, 16 Apr 2011 11:39:25 +0200

This is my first bug report for emacs, so bear with me:

I'm encountering odd behaviour when using `which-function-mode' with
`cperl-mode' in emacs version 24. It's a build of trunk's 103902
revision.


Consider these two files:

foo.el:

[snip]
(mapc
  (lambda (pair)
    (if (eq (cdr pair) 'perl-mode)
      (setcdr pair 'cperl-mode)))
  (append auto-mode-alist interpreter-mode-alist))

(which-function-mode t)
[snap]

And foo.pl:

[snip]
$foo = qq{I'm just another Perl Hacker.};
[snap]

Then I would start emacs like this:

% emacs -nw -Q

...and then:

M-x load-file RET foo.el RET
C-x C-f foo.pl RET

Now font locking is screwed up. The "qq" is highlighted as
`cperl-nonoverridable-face', which is correct. But "{I" shows up in
`default'. Which is wrong. Now, the ' looks like the start of a string
and it's highlighted as `font-lock-string-face'. But because the "q{"
isn't the start of the string but the single quote, the closing "}"
doesn't end the string and so the ";" (and in fact, any following lines
would be too, until another single quote would be encountered) is
highlighted in `font-lock-string-face', as well.

When I'm removing the "(which-function-mode t)" line from "foo.el", the
problem goes away.


What follows is the information `report-emacs-bug' gathered from my
fully-blown setup with `which-function-mode' disabled. I won't snip it
out for completeness.


In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2011-04-02 on bones
configured using `configure  '--with-x' '--with-imagemagick''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_GB.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  global-whitespace-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  tabbar-mwheel-mode: t
  tabbar-mode: t
  show-paren-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC x r e p o r t TAB RET

Recent messages:
Setting up colours: `dark256'
Loading /home/hawk/.emacs.d/emacs-looks.el (source)...done
Loading /home/hawk/.emacs.d/emacs-modeline.el (source)...done
Loading /home/hawk/.emacs.d/emacs-org.el (source)...done
Loading /home/hawk/.emacs.d/emacs-spell.el (source)...done
Done loading emacs setup; have a nice day.
No desktop file.
Loading term/xterm...done
For information about GNU Emacs and the GNU system, type C-h C-a.
viper-del-backward-char-in-insert: Text is read-only [11 times]

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Features:
(shadow sort mail-extr message sendmail format-spec rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev mail-utils gmm-utils mailheader emacsbug url-util
url-parse auth-source eieio byte-opt bytecomp byte-compile gnus-util
time-date password-cache url-vars mm-util mail-prsvr ispell org-install
disp-table whitespace auto-complete-config auto-complete popup
yasnippet-bundle dropdown-list yasnippet derived assoc diminish winring
tabbar smooth-scrolling viper-in-more-modes vimpulse paren undo-tree
easy-mmode cl desktop hippie-exp comint cc-mode cc-fonts easymenu
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs regexp-opt
ido viper edmacro kmacro viper-ex viper-macs viper-mous viper-cmd
viper-keym ring viper-util viper-init advice help-fns advice-preload
time tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
cus-face files text-properties overlay md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Message #10 received at 8509-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: 8509-done <at> debbugs.gnu.org, Frank Terbeck <ft <at> bewatermyfriend.org>
Subject: Re: bug#8509: 24.0.50;
 cperl-mode with which-function-mode breaks font-locking
Date: Fri, 5 Jul 2019 21:55:19 +0200

Frank Terbeck <ft <at> bewatermyfriend.org> writes:

> This is my first bug report for emacs, so bear with me:
>
> I'm encountering odd behaviour when using `which-function-mode' with
> `cperl-mode' in emacs version 24. It's a build of trunk's 103902
> revision.
>
>
> Consider these two files:
>
> foo.el:
>
> [snip]
> (mapc
>   (lambda (pair)
>     (if (eq (cdr pair) 'perl-mode)
>       (setcdr pair 'cperl-mode)))
>   (append auto-mode-alist interpreter-mode-alist))
>
> (which-function-mode t)
> [snap]
>
> And foo.pl:
>
> [snip]
> $foo = qq{I'm just another Perl Hacker.};
> [snap]
>
> Then I would start emacs like this:
>
> % emacs -nw -Q
>
> ...and then:
>
> M-x load-file RET foo.el RET
> C-x C-f foo.pl RET
>
> Now font locking is screwed up. The "qq" is highlighted as
> `cperl-nonoverridable-face', which is correct. But "{I" shows up in
> `default'. Which is wrong. Now, the ' looks like the start of a string
> and it's highlighted as `font-lock-string-face'. But because the "q{"
> isn't the start of the string but the single quote, the closing "}"
> doesn't end the string and so the ";" (and in fact, any following lines
> would be too, until another single quote would be encountered) is
> highlighted in `font-lock-string-face', as well.
>
> When I'm removing the "(which-function-mode t)" line from "foo.el", the
> problem goes away.

Hi,

I can't reproduce this on Emacs 26.2, the latest version of Emacs.

Since the bug was reported 8 years ago, I will assume that this bug has
been fixed while you were waiting for a reply.  I am therefore closing
this bug.

If you can still reproduce this issue on the latest version of Emacs,
please report back and we can re-open the issue.

Thanks,
Stefan Kangas

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