comments are not highlighted

comments are not highlighted

[Prem Mallappa]

Hi 

i opened file /usr/src/kernel-source-2.xxx/drivers/net/eepro100.c

which has arround 150 lines of comments. at line 184 or so.. . Emacs stops
changing the color (global-font-lock-mode) of comments after certain point
( 100 lines or so) after that it shows the comments as normal text and
highlights the keywords such as "do" "for" etc.. 

One more thing i noticed i selected whole buffer and said "indent-region"
Now everything is fine..
Why emacs is unable to see the comments as *comments*
I am running 21.3.1

prem

Re: comments are not highlighted

[Stefan Monnier]

> which has arround 150 lines of comments. at line 184 or so.. . Emacs stops
> changing the color (global-font-lock-mode) of comments after certain point
> ( 100 lines or so) after that it shows the comments as normal text and
> highlights the keywords such as "do" "for" etc..

My crystal ball says that you have an open-paren or open-bracket or
open-brace in column 0 somewhere inside your 150-lines-long comment.

Emacs thinks this indicates a "beginning of defun" and thus assumes
it's not inside a comment.  This heuristic is used in some cases but not
all the time, so the highlighting will sometimes be correct and sometimes
not depending on where the font-locking has started (since you're
presumably using jit-lock which highlights the buffer on the fly in small
increments).


        Stefan

Re: comments are not highlighted

[Rob Thorpe]

Prem Mallappa <prem_mallappa@hotpop.com> wrote in message news:<pan.2003.09.16.02.53.46.977248@hotpop.com>...
> Hi 
> 
> i opened file /usr/src/kernel-source-2.xxx/drivers/net/eepro100.c
> 
> which has arround 150 lines of comments. at line 184 or so.. . Emacs stops
> changing the color (global-font-lock-mode) of comments after certain point
> ( 100 lines or so) after that it shows the comments as normal text and
> highlights the keywords such as "do" "for" etc.. 
> 
> One more thing i noticed i selected whole buffer and said "indent-region"
> Now everything is fine..
> Why emacs is unable to see the comments as *comments*
> I am running 21.3.1

Got no idea what causes that, but M-x lazy-lock-mode RET fixes it
Bug in jit lock?  I don't even know if its gauranteed to work in all situations.