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From: Alan Mackenzie <acm@muc.de>
To: "Mattias Engdegård" <mattiase@acm.org>
Cc: Lars Ingebrigtsen <larsi@gnus.org>, 25706@debbugs.gnu.org
Subject: bug#25706: 26.0.50; Slow C file fontification
Date: Tue, 1 Dec 2020 09:29:52 +0000	[thread overview]
Message-ID: <X8YNEIAqZypii4wJ@ACM> (raw)
In-Reply-To: <86EC566E-0CE6-4D98-9025-0C0551CE1546@acm.org>

Hello again, Mattias.

On Mon, Nov 30, 2020 at 18:04:56 +0100, Mattias Engdegård wrote:
> > Actually, it's the underscores!

> Found it. Suggested fix attached.

> It can be improved: at least one pair of regexp group brackets can be
> removed, but I didn't dare doing so because I wasn't sure if it would
> throw some group numbers off by one.

> Alan, please, let's work together and remove unnecessary capture groups
> from the regexps! Even XEmacs regexps support non-capturing brackets,
> \(?:...\), and they save time, regexp stack space, and reduce the
> hassle of computing the 'regexp depth' everywhere.

There are 342 occurrences of '\\\\([^?]' in CC Mode.  Most of these can
surely be replaced by "\\(?:", but not all, by a long way.  This change
will be fun.

-- 
Alan Mackenzie (Nuremberg, Germany).





  parent reply	other threads:[~2020-12-01  9:29 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-13 18:20 bug#25706: 26.0.50; Slow C file fontification Sujith
2020-11-30 11:26 ` Lars Ingebrigtsen
2020-11-30 11:37   ` Lars Ingebrigtsen
2020-11-30 12:46 ` Mattias Engdegård
2020-11-30 12:49   ` Lars Ingebrigtsen
2020-11-30 16:27   ` Eli Zaretskii
2020-11-30 16:38   ` Alan Mackenzie
2020-11-30 16:53     ` Mattias Engdegård
2020-11-30 17:04       ` Mattias Engdegård
2020-12-01  5:48         ` Ravine Var
2020-12-01 13:34           ` Mattias Engdegård
2020-12-01  9:29         ` Alan Mackenzie [this message]
2020-12-01  9:44           ` martin rudalics
2020-12-01 10:07             ` Alan Mackenzie
2020-12-01  9:21       ` Alan Mackenzie
2020-12-01 12:03         ` Mattias Engdegård
2020-12-01 12:57           ` Alan Mackenzie
2020-12-01 14:07             ` Mattias Engdegård
2020-12-01 15:27               ` Alan Mackenzie
2020-12-01 18:59                 ` Mattias Engdegård
2020-12-02 10:15                   ` Alan Mackenzie
     [not found]                   ` <X8dpQeGaDD1w3kXX@ACM>
2020-12-02 15:06                     ` Mattias Engdegård
2020-12-03 10:48                       ` Alan Mackenzie
2020-12-03 14:03                         ` Mattias Engdegård
2020-12-04 21:04                           ` Alan Mackenzie
     [not found]                           ` <X8qkcokfZGbaK5A2@ACM>
2020-12-05 15:20                             ` Mattias Engdegård
2020-12-08 18:42                               ` Alan Mackenzie
     [not found]                               ` <X8/JG7eD7SfkEimH@ACM>
2020-12-08 19:32                                 ` Mattias Engdegård
2020-12-09  7:31                                 ` Ravine Var
2020-12-09  7:47                                   ` Ravine Var
2020-12-10  8:08                                     ` Alan Mackenzie
2020-12-09 18:46                                   ` Alan Mackenzie
     [not found]                                   ` <X9Ebn7hKnG/vpDcZ@ACM>
2020-12-09 20:04                                     ` Eli Zaretskii
2020-12-09 20:32                                       ` Alan Mackenzie
2020-12-10 17:02                                     ` Ravine Var
2020-12-10 20:02                                       ` Alan Mackenzie
2020-12-11 10:55                                         ` Ravine Var
2020-12-12 15:34                                           ` Alan Mackenzie
     [not found]                                           ` <X9TjCeydJaE2mpK8@ACM>
2020-12-14  7:20                                             ` Ravine Var
2020-12-14 11:44                                               ` Alan Mackenzie
2020-12-15  4:01                                                 ` Ravine Var
2020-12-15 12:27                                                   ` Alan Mackenzie
2020-12-09 17:00                                 ` Mattias Engdegård
2020-12-10 12:26                                   ` Alan Mackenzie
2020-11-30 18:30   ` Alan Mackenzie

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