From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Wolfgang Jenkner <wjenkner@inode.at>
Cc: 21077@debbugs.gnu.org, Ista Zahn <istazahn@gmail.com>
Subject: bug#21077: 24.5; Slow printing in inferior python buffer with python-shell-enable-font-lock
Date: Mon, 03 Aug 2015 17:41:24 -0400 [thread overview]
Message-ID: <jwvd1z46ojd.fsf-monnier+emacsbugs@gnu.org> (raw)
In-Reply-To: <85oair5gex.fsf@iznogoud.viz> (Wolfgang Jenkner's message of "Sat, 01 Aug 2015 14:42:14 +0200")
>> In the case of comint modes, rather than disable font-lock we should
>> refrain from font-locking the text after the last \n (since that's the
>> line that keeps getting expanded, so we end up re-font-locking it O(N)
>> times for a line of length N, for a total amount of work of O(N^2)).
>> IIRC I have a similar hack in grep.el or compile.el.
> But comint-output-filter does
> (font-lock-prepend-text-property prompt-start (point)
> 'font-lock-face
> 'comint-highlight-prompt)
> So keyword fontification seems to be inhibited anyway. Is this done in
> a particularly inefficient way?
That doesn't inhibit keyword fontification per se. It just makes most
keyword rules ineffective, but the test is done after the hard work
anyway, so in a way yes, it's done in an inefficient way (tho skipping
some keywords by checking font-lock-face would in general be
even more inefficient).
Stefan
prev parent reply other threads:[~2015-08-03 21:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-16 16:42 bug#21077: 24.5; Slow printing in inferior python buffer with python-shell-enable-font-lock Ista Zahn
2015-07-16 18:34 ` Eli Zaretskii
2015-07-16 19:09 ` Ista Zahn
2015-07-16 19:34 ` Eli Zaretskii
2015-07-16 19:50 ` Ista Zahn
2015-07-17 6:53 ` Eli Zaretskii
2015-07-17 8:33 ` Stefan Monnier
2015-07-17 8:56 ` Rasmus
2015-07-29 20:50 ` Ista Zahn
2015-07-30 23:19 ` Stefan Monnier
2015-07-31 0:27 ` Ista Zahn
2015-07-31 22:07 ` Stefan Monnier
2015-08-01 1:46 ` Ista Zahn
2015-08-01 12:36 ` Wolfgang Jenkner
2015-08-01 16:26 ` Ista Zahn
2015-08-03 23:57 ` Wolfgang Jenkner
2016-07-14 1:31 ` npostavs
2015-08-01 12:42 ` Wolfgang Jenkner
2015-08-03 21:41 ` Stefan Monnier [this message]
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