From: David Koppelman <koppel@ece.lsu.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: martin rudalics <rudalics@gmx.at>,
Chong Yidong <cyd@stupidchicken.com>,
192@emacsbugs.donarmstrong.com, Bruno Haible <bruno@clisp.org>,
emacs-devel@gnu.org
Subject: Re: regexp does not work as documented
Date: Mon, 12 May 2008 12:04:43 -0500 [thread overview]
Message-ID: <yg5od7b8ndg.fsf@nested.ece.lsu.edu> (raw)
In-Reply-To: <jwvzlqvmr6g.fsf-monnier+emacsbugreports@gnu.org> (Stefan Monnier's message of "Mon, 12 May 2008 12:29:01 -0400")
> a multiline region spanning 0..400. Before fontifying, you need
> to unfontify. The region 100..200 can be completely unfontified, but
Hadn't thought about that. I don't want things to get too elaborate but
it would be nice to have guaranteed behavior below some multi-line size
and not risk slow behavior.
One possibility is to retain the code as it is, except have
extend-region-multiline extend to some maximum size (say, 100 lines)
with the expectation that the larger region would be used for deferred
fontification (I guess jit-lock does that). The only difference with
current operation is that the font-lock-multiline property is ignored
both ensuring proper matches (when the property is not present but a
pattern would match) and avoiding huge sized regions.
Now, if we wanted really large multi-line matches we could unfontify the
larger region but use a window+margin sized region (accounting for all
buffers visiting the file) for the regular patterns and then mark the
other parts of the larger region as unfontified. This would force
re-applying the multi-line patterns on buffer motion, though
we could cache the match data to avoid re-seaching.
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> I'm proposing that font-lock divide keywords into two or three
>> classes, ordinary, multi-line, and maybe mega-line, matches for
>> multi-line and mega-line keywords would be over much larger
>> regions. Here is how it might work with two classes (keep in mind that
>> I don't yet have a thorough understanding of font-lock and jit-lock):
>
> I do not understand how you propose to solve the main problem:
> Let's say you want to fontify a line spanning chars 100..200 and
> a multiline region spanning 0..400. Before fontifying, you need
> to unfontify. The region 100..200 can be completely unfontified, but
> what about 0..99 and 201..400? You can't unfontify them completely
> since you don't want to refontify them completely either, so you'd need
> to figure out which part of the fontification comes from the
> multiline keywords.
>
> Also, the order between keywords is important, so unless you force all
> multiline keywords to go at the very end, you'd also need to remove (on
> the 0..99 and 201..400 regions) the fontification coming from small
> keywords that were placed after multiline keywords and reapply
> it afterwards?
>
>
> Stefan
next prev parent reply other threads:[~2008-05-12 17:04 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-06 4:20 regexp does not work as documented Chong Yidong
2008-05-06 11:35 ` Bruno Haible
2008-05-06 12:12 ` martin rudalics
2008-05-10 19:18 ` David Koppelman
2008-05-10 20:13 ` bug#192: " David Koppelman
2008-05-10 20:13 ` David Koppelman
2008-05-11 7:40 ` bug#192: " martin rudalics
2008-05-11 7:40 ` martin rudalics
2008-05-11 14:27 ` bug#192: " Chong Yidong
2008-05-11 14:27 ` Chong Yidong
2008-05-11 15:36 ` David Koppelman
2008-05-11 18:44 ` Stefan Monnier
2008-05-11 19:09 ` David Koppelman
2008-05-12 1:28 ` bug#192: " Stefan Monnier
2008-05-12 1:28 ` Stefan Monnier
2008-05-12 15:03 ` David Koppelman
2008-05-12 16:29 ` Stefan Monnier
2008-05-12 17:04 ` David Koppelman [this message]
2008-05-12 17:04 ` bug#192: " David Koppelman
2008-05-12 16:29 ` Stefan Monnier
2008-05-12 15:03 ` David Koppelman
2008-05-11 19:09 ` David Koppelman
2008-05-11 18:44 ` Stefan Monnier
2008-05-11 15:36 ` David Koppelman
2008-05-11 18:44 ` Stefan Monnier
2008-05-11 20:03 ` Thomas Lord
2008-05-12 1:43 ` bug#192: " Stefan Monnier
2008-05-12 1:43 ` Stefan Monnier
2008-05-12 3:30 ` bug#192: " Thomas Lord
2008-05-12 3:30 ` Thomas Lord
2008-05-12 13:43 ` bug#192: " Stefan Monnier
2008-05-12 13:43 ` Stefan Monnier
2008-05-12 15:55 ` bug#192: " Thomas Lord
2008-05-12 15:55 ` Thomas Lord
2008-05-12 16:18 ` tomas
2008-05-12 16:18 ` bug#192: " tomas
2008-05-11 20:03 ` Thomas Lord
2008-05-11 18:44 ` Stefan Monnier
2008-05-10 19:18 ` David Koppelman
2008-05-06 15:35 ` Stefan Monnier
2008-05-06 21:29 ` Bruno Haible
2008-05-10 20:04 ` Bruno Haible
2008-05-10 20:04 ` bug#192: " Bruno Haible
2008-05-06 15:00 ` David Koppelman
2008-05-06 21:35 ` Bruno Haible
2008-05-07 1:04 ` Stefan Monnier
2008-05-07 1:08 ` Auto-discovery of multi-line font-lock regexps Stefan Monnier
2008-05-07 3:46 ` Chong Yidong
2008-05-07 4:21 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2008-05-06 1:30 regexp does not work as documented Bruno Haible
2008-05-06 14:15 ` Johan Bockgård
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