From: "Herbert Euler" <herberteuler@hotmail.com>
To: monnier@iro.umontreal.ca, dak@gnu.org
Cc: rms@gnu.org, miles.bader@necel.com, schwab@suse.de,
emacs-devel@gnu.org, juri@jurta.org, miles@gnu.org
Subject: Re: find-file-noselect needs save-match-data
Date: Thu, 14 Jun 2007 14:37:42 +0800 [thread overview]
Message-ID: <BAY143-F30A799CB92EA9481493A69DA1F0@phx.gbl> (raw)
In-Reply-To: <jwvir9r1vv3.fsf-monnier+emacs@gnu.org>
>So I don't see current usage as problematic w.r.t efficiency.
>The only real problem with it is that people tend to not know/understand it
>and are thus tempted to complain that most functions need to be wrapped in
>save-match-data, which then leads to long discussions such as this one.
>Maybe we should make the convention more prominent by adding it to the
>docstring of save-match-data?
This is probably true. I found this strange behavior when I studied
the previous SKIP_SYNTAX_BACKWARD patch. I grep'ed to get all the
places that invoke SKIP_SYNTAX_BACKWARD, and looked at them one by
one. Several are in regex.c. I wrote many expressions in the
*scratch* buffer and evaluated them with C-x C-e sequentially to make
sure all the places in regex.c get called. When I evaluated the three
expressions in the beginning of this thread, I got wrong results and
started not to understand it. Starting Emacs with -Q, I found the
result is correct. So I knew it's something wrong with my
configuration. Finally, I knew it's in type-break, and then I knew
the problem is caused by `find-file-noselect' which is put on
`post-command-hook' and changes the match data.
I missed something, at least the efficiency. And the operations above
is truely rare: I don't think people would do that often too. If in
most cases such a wrong result will not happen, it is then not a
problem for common usage. Unless some mode makes the wrong cases
common, it is safe to ignore it.
However, this is surely a shortcoming of Emacs.
Regards,
Guanpeng Xu
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next prev parent reply other threads:[~2007-06-14 6:37 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-04 15:17 find-file-noselect needs save-match-data Herbert Euler
2007-06-04 16:05 ` martin rudalics
2007-06-05 3:10 ` Herbert Euler
2007-06-05 5:52 ` martin rudalics
2007-06-05 22:32 ` Richard Stallman
2007-06-06 1:13 ` Stefan Monnier
2007-06-06 1:44 ` Herbert Euler
2007-06-06 6:58 ` martin rudalics
2007-06-06 7:25 ` David Kastrup
2007-06-06 22:09 ` Richard Stallman
2007-06-06 12:14 ` Stefan Monnier
2007-06-06 22:09 ` Richard Stallman
2007-06-06 6:57 ` martin rudalics
2007-06-06 12:17 ` Stefan Monnier
2007-06-06 12:33 ` Lennart Borgman (gmail)
2007-06-06 12:49 ` martin rudalics
2007-06-06 22:10 ` Richard Stallman
2007-06-06 22:29 ` Stefan Monnier
2007-06-08 7:11 ` Richard Stallman
2007-06-08 8:31 ` Kim F. Storm
2007-06-08 9:42 ` martin rudalics
2007-06-08 10:31 ` Kim F. Storm
2007-06-09 9:45 ` Richard Stallman
2007-06-10 0:05 ` Herbert Euler
2007-06-10 0:11 ` Herbert Euler
2007-06-09 9:46 ` Richard Stallman
2007-06-09 21:32 ` Juri Linkov
2007-06-09 21:59 ` David House
2007-06-09 22:43 ` Juri Linkov
2007-06-09 22:53 ` Jason Rumney
2007-06-09 23:59 ` Miles Bader
2007-06-10 0:02 ` Drew Adams
2007-06-10 13:19 ` Richard Stallman
2007-06-12 3:05 ` Bob Rogers
2007-06-12 4:06 ` Miles Bader
2007-06-12 16:45 ` Juri Linkov
2007-06-12 17:46 ` Andreas Schwab
2007-06-12 21:55 ` David Kastrup
2007-06-12 22:10 ` Miles Bader
2007-06-12 22:37 ` David Kastrup
2007-06-13 16:22 ` Richard Stallman
2007-06-13 17:31 ` Stefan Monnier
2007-06-13 18:33 ` David Kastrup
2007-06-13 19:55 ` Stefan Monnier
2007-06-14 6:37 ` Herbert Euler [this message]
2007-06-15 8:48 ` Richard Stallman
2007-06-15 14:22 ` Stefan Monnier
2007-06-15 16:03 ` Herbert Euler
2007-06-14 6:57 ` martin rudalics
2007-06-14 14:36 ` Stefan Monnier
2007-06-14 16:05 ` Herbert Euler
2007-06-14 16:22 ` Stefan Monnier
2007-06-15 1:59 ` Herbert Euler
2007-06-15 8:49 ` Richard Stallman
2007-06-15 8:49 ` Richard Stallman
2007-06-14 6:57 ` martin rudalics
2007-06-15 8:48 ` Richard Stallman
2007-06-15 14:23 ` Stefan Monnier
2007-06-15 22:45 ` Richard Stallman
2007-06-17 19:54 ` Juri Linkov
2007-06-17 20:27 ` Lennart Borgman (gmail)
2007-06-14 16:19 ` Richard Stallman
2007-06-14 17:18 ` David Kastrup
2007-06-15 19:21 ` Richard Stallman
2007-06-15 19:52 ` Stefan Monnier
2007-06-13 23:39 ` Miles Bader
2007-06-14 0:52 ` Stefan Monnier
2007-06-14 6:58 ` martin rudalics
2007-06-14 16:20 ` Richard Stallman
2007-06-14 18:50 ` Stefan Monnier
2007-06-15 6:31 ` martin rudalics
2007-06-15 14:20 ` Stefan Monnier
2007-06-15 15:55 ` Herbert Euler
2007-06-15 19:22 ` Richard Stallman
2007-06-16 10:01 ` martin rudalics
2007-06-16 22:35 ` Richard Stallman
2007-06-15 19:21 ` Richard Stallman
2007-06-15 19:55 ` Stefan Monnier
2007-06-15 20:03 ` David Kastrup
2007-06-16 18:51 ` Richard Stallman
2007-06-16 19:10 ` David Kastrup
2007-06-17 21:49 ` Richard Stallman
2007-06-18 5:16 ` David Kastrup
2007-06-18 21:30 ` Richard Stallman
2007-06-18 21:42 ` David Kastrup
2007-06-19 22:26 ` Richard Stallman
2007-06-19 22:42 ` David Kastrup
2007-06-25 13:19 ` Richard Stallman
2007-06-16 3:50 ` Herbert Euler
2007-06-17 12:28 ` Stefan Monnier
2007-06-16 18:51 ` Richard Stallman
2007-06-16 21:39 ` Miles Bader
2007-06-17 8:55 ` Richard Stallman
2007-06-17 3:19 ` Herbert Euler
2007-06-17 3:26 ` Herbert Euler
2007-06-17 21:49 ` Richard Stallman
2007-06-17 12:50 ` Stefan Monnier
2007-06-18 7:25 ` Richard Stallman
2007-06-20 8:07 ` Herbert Euler
2007-06-20 14:12 ` Juri Linkov
2007-06-20 14:44 ` Herbert Euler
2007-06-21 1:07 ` Richard Stallman
2007-06-21 1:29 ` Herbert Euler
2007-06-21 6:31 ` David Kastrup
2007-06-28 14:06 ` Herbert Euler
2007-06-29 15:07 ` Herbert Euler
2007-07-06 17:05 ` byte-compiling an elisp-file fails in Emacs 22.1 (reproducable) klaus.berndl
2007-07-06 22:20 ` Jason Rumney
2007-07-07 13:06 ` Richard Stallman
2007-07-08 6:30 ` AW: " klaus.berndl
2007-06-22 1:51 ` find-file-noselect needs save-match-data Richard Stallman
2007-06-20 17:36 ` Richard Stallman
2007-06-13 16:21 ` Richard Stallman
2007-06-05 5:18 ` Richard Stallman
2007-06-06 1:10 ` Stefan Monnier
2007-06-14 16:19 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2007-06-06 0:25 Herbert Euler
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