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AW: font-locking and open parens in column 0
From: |
Mackenzie, Alan |
Subject: |
AW: font-locking and open parens in column 0 |
Date: |
Fri, 3 Nov 2006 09:44:09 +0100 |
Hi, Martin!
>-----Ursprüngliche Nachricht-----
>Von: martin rudalics [mailto:address@hidden
>Gesendet: Donnerstag, 2. November 2006 19:32
>An: Mackenzie, Alan
>Cc: address@hidden; Richard Stallman; Alan Mackenzie
>Betreff: Re: font-locking and open parens in column 0
>Good evening, Alan
> > The cause of this (as Martin (almost) discerned) is that the handling of
> > (eq open-paren-in-column-0-is-defun-start nil) in begining-of-defun-raw
> > hasn't been implemented. The function just looks for a "(" in C0
> > regardless of that variable.
> >
> > "Clearly", when that variable is nil, a defun can begin at no place other
> > than a paren at the outermost level. Therefore, the function must scan
> > the entire source file from BOB, as in the earliest days.
>No! That would be a serious regression. Font-locking should never be
>forced to scan from BOB.
1 2 3 4 5 6 7 3
I agree with you. :-) However, my patch is to do with
beginning-of-defun-raw, not font-locking. Are you saying that
open-paren-in-column-0-is-defun-start shouldn't exist at all? When it is
nil, a paren in column 0 may not, of itself, be regarded as a defun
start.
Richard, please say what you think about this.
I would say, rather, that font-locking should not use b-o-defun-raw when
o-p-i-c-0-i-d-s is nil, except in exceptional circumstances. The case
you spotted in syntax.c (and I've really no idea how you did ;-), is
such an exceptional case. CC Mode caches parenthesis structures.
My patch did fix the bug (a whole screenful of misfontified string in
syntax.c), though, didn't it?
>Observe that this would only serve to handle
>the rare case where a user puts a paren in column zero of a C comment.
>I think warning about such parens as in emacs-lisp-mode is sufficient.
>Please try to make use of Richard's `font-lock-syntax-paren-check' from
>this thread as with
> (put font-lock-beginning-of-syntax-function
> 'font-lock-syntax-paren-check t)
>Moreover, any such code as yours should ....
You're talking about my patch to beginning-of-defun-raw, here, not the
stuff in CC Mode. I don't have the source files to hand at the moment.
>(1) Consult `syntax-ppss' first.
>
>(2) Try to use the 9th field of the return value of
>`parse-partial-sexp'
>to find the outermost paren instead of up-/forward-/backward-listing.
>
>(3) Crowd the cache of `syntax-ppss' in order to avoid further scans.
OK, thanks! I'll need to learn about these optimisations.
begining-of-defun-raw, when used in font locking, could be distressingly
slow without them.
--
Alan Mackenzie (Ittersbach, Germany)
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- AW: font-locking and open parens in column 0,
Mackenzie, Alan <=
- Re: AW: font-locking and open parens in column 0, martin rudalics, 2006/11/03
- Re: font-locking and open parens in column 0, Stefan Monnier, 2006/11/03
- Re: AW: font-locking and open parens in column 0, Richard Stallman, 2006/11/04
- Re: AW: font-locking and open parens in column 0, Stefan Monnier, 2006/11/10
- Re: AW: font-locking and open parens in column 0, Richard Stallman, 2006/11/10
- Re: AW: font-locking and open parens in column 0, Stefan Monnier, 2006/11/10
- Re: AW: font-locking and open parens in column 0, Richard Stallman, 2006/11/12
- Re: AW: font-locking and open parens in column 0, Richard Stallman, 2006/11/12
- Re: AW: font-locking and open parens in column 0, martin rudalics, 2006/11/12
- Re: AW: font-locking and open parens in column 0, Stefan Monnier, 2006/11/13