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Refine documentation of `looking-back'.

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* lisp/subr.el (looking-back): Do not recommend using looking-back.  (bug#5689)
* doc/lispref/searching.texi (Regexp Search): Refine.
This commit is contained in:
Xue Fuqiao 2013-09-29 14:16:45 +08:00
parent 4ec3c26861
commit 6cfe977d9f
4 changed files with 19 additions and 8 deletions
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4
doc/lispref/ChangeLog
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@ -1,3 +1,7 @@
2013-09-29 Xue Fuqiao <xfq.free@gmail.com>
* searching.texi (Regexp Search): Refine.
2013-09-22 Xue Fuqiao <xfq.free@gmail.com> 2013-09-22 Xue Fuqiao <xfq.free@gmail.com>
* nonascii.texi (Default Coding Systems): Typo fix. * nonascii.texi (Default Coding Systems): Typo fix.

14
doc/lispref/searching.texi
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@ -1146,13 +1146,7 @@ implemented by searching backwards from point for a match that ends at
point. That can be quite slow if it has to search a long distance. point. That can be quite slow if it has to search a long distance.
You can bound the time required by specifying @var{limit}, which says You can bound the time required by specifying @var{limit}, which says
not to search before @var{limit}. In this case, the match that is not to search before @var{limit}. In this case, the match that is
found must begin at or after @var{limit}. found must begin at or after @var{limit}. Here's an example:
If @var{greedy} is non-@code{nil}, this function extends the match
backwards as far as possible, stopping when a single additional
previous character cannot be part of a match for regexp. When the
match is extended, its starting position is allowed to occur before
@var{limit}.
@example @example
@group @group
@ -1168,6 +1162,12 @@ comes back" twice.
@end group @end group
@end example @end example
If @var{greedy} is non-@code{nil}, this function extends the match
backwards as far as possible, stopping when a single additional
previous character cannot be part of a match for regexp. When the
match is extended, its starting position is allowed to occur before
@var{limit}.
@c http://debbugs.gnu.org/5689 @c http://debbugs.gnu.org/5689
As a general recommendation, try to avoid using @code{looking-back} As a general recommendation, try to avoid using @code{looking-back}
wherever possible, since it is slow. For this reason, there are no wherever possible, since it is slow. For this reason, there are no

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lisp/ChangeLog
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@ -1,3 +1,7 @@
2013-09-29 Xue Fuqiao <xfq.free@gmail.com>
* subr.el (looking-back): Do not recommend using looking-back.
2013-09-28 Alan Mackenzie <acm@muc.de> 2013-09-28 Alan Mackenzie <acm@muc.de>
Fix indentation/fontification of Java enum with "implements". Fix indentation/fontification of Java enum with "implements".

5
lisp/subr.el
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@ -3482,7 +3482,10 @@ If GREEDY is non-nil, extend the match backwards as far as
possible, stopping when a single additional previous character possible, stopping when a single additional previous character
cannot be part of a match for REGEXP. When the match is cannot be part of a match for REGEXP. When the match is
extended, its starting position is allowed to occur before extended, its starting position is allowed to occur before
LIMIT." LIMIT.
As a general recommendation, try to avoid using `looking-back'
wherever possible, since it is slow."
(let ((start (point)) (let ((start (point))
(pos (pos
(save-excursion (save-excursion