GNU bug report logs - #5422
syntax highlighting bug

Previous Next

Full log

Message #18 received at 5422 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Glenn Morris <rgm <at> gnu.org>
Cc: "blew <at> astro.uni.torun.pl" <blew <at> astro.uni.torun.pl>,
	"5422 <at> debbugs.gnu.org" <5422 <at> debbugs.gnu.org>
Subject: Re: bug#5422: syntax highlighting bug
Date: Tue, 4 Oct 2011 07:32:57 +0200

Hello.


3 okt 2011 kl. 22:59 skrev Glenn Morris <rgm <at> gnu.org>:

> Bartosz Lew wrote:
> 
>> This is just to report on some minor C++ syntax highlighting problem
>> in emacs.
>> 
>> when I write:
>> 
>>    if (a < b->c())  { do this; } else { do that; }
>> 
>> two two things go wrong:
>> 1) parentheses matching doesn't work correctly 
>>    emacs matches the closing bracket of the if condition with the
>> "<" - "smaller > than" sign in the if condition.
>> 
>> 2) the automatic positioning of any code written below gets confused due to 
>> this parentheses matching problem.
>> 
>> I use:
>> 
>> GNU Emacs 23.1.1 (i386-redhat-linux-gnu, GTK+ Version 2.16.6)
>> of 2009-09-29 on x86-7.fedora.phx.redhat.com
> 
> I am unable to reproduce this in any version of Emacs, including 23.1.
> If you still see the problem in the latest release, please send a
> complete example starting from emacs -Q.
> 
> (There seem to have been some fixes in this area, eg
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4847 )
> 

This is one of the elusive cc-mode bugs that isn't easy to reproduce. 

AFAIK it depends on some cache in cc-mode getting out of sync. So you are more likely to see it on a large file you have edited in several places. It might even depend on what kind of editing you have done. I think this is a symptom of some underlying bug.

I see this in 23.3 and the trunk at least 2-3 times per day when editing code with a lot of templates. The < and > are mistaken for start/end brace or parentesis.

Save the file, kill the buffer, and reopen the file usually fixes it.

    Jan D.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.