GNU bug report logs - #4304
Font-lock in cperl-mode is broken

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Herbert Euler <herberteuler <at> hotmail.com>
Subject: bug#4304 closed by Chong Yidong <cyd <at> stupidchicken.com> (Re:
 Font-lock in cperl-mode is broken)
Date: Sun, 13 Sep 2009 17:15:05 +0000

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#4304: Font-lock in cperl-mode is broken

It has been closed by Chong Yidong <cyd <at> stupidchicken.com>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Chong Yidong <cyd <at> stupidchicken.com> by
replying to this email.


-- 
4304: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4304
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: Herbert Euler <herberteuler <at> hotmail.com>
Cc: 4304-done <at> debbugs.gnu.org
Subject: Re: Font-lock in cperl-mode is broken
Date: Sun, 13 Sep 2009 13:11:24 -0400

> In the newest Emacs HEAD source, font-lock in cperl-mode is broken.

This was my mistake; I've checked in a fix.  Thanks.

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From: Herbert Euler <herberteuler <at> hotmail.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: Font-lock in cperl-mode is broken
Date: Tue, 1 Sep 2009 12:21:23 +0800

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Package: emacs
Version: 23.0.50

In the newest Emacs HEAD source, font-lock in cperl-mode is broken.
Here are the steps to reproduce the problem:

1. Start emacs:

     $ emacs -Q

2. Visit an empty perl file and switch to cperl-mode:

     C-x C-f x.pl
     M-x cperl-mode

3. Type `print' (no any characters follow the character `t'):

     print|

   The vertical bar `|' here indicates the cursor.  Now the word
   `print' is highlighted with face `cperl-nonoverridable-face'.

4. Now that the cursor is after the character `t', type SPC to append
   a whitespace character.

     print |

   This time, the word `print' gets unhighlighted.  There is no
   property `face' for that word now:

     ;; Point is in between `print'.
     (text-properties-at (point))
          ==>  (fontified t)

   Appending more whitespace characters will not call the highlight
   back.  However, deleting all of the whitespace characters
   highlights it again.

     print |                         ;; Type DEL
     print|                          ;; `print' gets highlighted again

   And the face property is added back:

     ;; Point is in between `print'.
     (text-properties-at (point))
          ==>  (face cperl-nonoverridable-face font-lock-multiline t fontified t)

The same problem exists for larger Perl programs.  This is only a
simple case.

Regards,
Guanpeng Xu


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