* Syntax properties and \_>
@ 2004-12-17 22:27 Ralf Angeli
2004-12-20 10:56 ` Richard Stallman
0 siblings, 1 reply; 3+ messages in thread
From: Ralf Angeli @ 2004-12-17 22:27 UTC (permalink / raw)
Hello everybody,
for font locking in AUCTeX am trying to match strings like "\\",
"\\*", "\-" but also "\newpage" and similar with a single regular
expression. I was trying to limit the match with help of \_> for
matching the empty string at the end of the strings. This works for
all constructs except "\\" because the character ?\\ has escape
syntax. Now I thought that placing a symbol syntax property onto the
second "\" would help, but it doesn't. Here is an example:
(with-temp-buffer
(insert "\\\\")
(put-text-property (1- (point)) (point) 'syntax-table '(3))
(newline)
(goto-char (point-min))
(let ((parse-sexp-lookup-properties t))
(re-search-forward "\\\\\\\\\\_>" nil t)))
Upon executing it you should see that it returns nil. But trying the
same example with "\\s_" instead of "\\\\\\\\\\_>" for the
`re-search-forward' statement returns a match.
Is this a bug in the way \_> is handled? It doesn't seem to recognize
syntax properties because there is a match if the syntax for "\" is
changed with `(modify-syntax-entry ?\\ "_")' instead of setting a
syntax property. Or am I doing something wrong?
--
Ralf
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Syntax properties and \_>
2004-12-17 22:27 Syntax properties and \_> Ralf Angeli
@ 2004-12-20 10:56 ` Richard Stallman
2004-12-20 13:42 ` Ralf Angeli
0 siblings, 1 reply; 3+ messages in thread
From: Richard Stallman @ 2004-12-20 10:56 UTC (permalink / raw)
Cc: emacs-devel
Does this patch fix your problem?
*** regex.c 06 Dec 2004 00:42:45 -0500 1.198
--- regex.c 20 Dec 2004 04:49:54 -0500
***************
*** 5860,5866 ****
PREFETCH_NOLIMIT ();
c2 = RE_STRING_CHAR (d, dend - d);
#ifdef emacs
! UPDATE_SYNTAX_TABLE_FORWARD (charpos);
#endif
s2 = SYNTAX (c2);
--- 5860,5866 ----
PREFETCH_NOLIMIT ();
c2 = RE_STRING_CHAR (d, dend - d);
#ifdef emacs
! UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1);
#endif
s2 = SYNTAX (c2);
***************
*** 5947,5953 ****
PREFETCH_NOLIMIT ();
c2 = RE_STRING_CHAR (d, dend - d);
#ifdef emacs
! UPDATE_SYNTAX_TABLE_FORWARD (charpos);
#endif
s2 = SYNTAX (c2);
--- 5947,5953 ----
PREFETCH_NOLIMIT ();
c2 = RE_STRING_CHAR (d, dend - d);
#ifdef emacs
! UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1);
#endif
s2 = SYNTAX (c2);
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Syntax properties and \_>
2004-12-20 10:56 ` Richard Stallman
@ 2004-12-20 13:42 ` Ralf Angeli
0 siblings, 0 replies; 3+ messages in thread
From: Ralf Angeli @ 2004-12-20 13:42 UTC (permalink / raw)
Cc: emacs-devel
* Richard Stallman (2004-12-20) writes:
> Does this patch fix your problem?
>
> *** regex.c 06 Dec 2004 00:42:45 -0500 1.198
> --- regex.c 20 Dec 2004 04:49:54 -0500
[...]
Yes, this fixes it. Thank you very much.
--
Ralf
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-12-17 22:27 Syntax properties and \_> Ralf Angeli
2004-12-20 10:56 ` Richard Stallman
2004-12-20 13:42 ` Ralf Angeli
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