From: Dmitry Gutov <dgutov@yandex.ru>
To: Alan Mackenzie <acm@muc.de>, emacs-devel@gnu.org
Subject: Re: New hook before-region-change-functions wanted
Date: Fri, 8 Sep 2017 23:47:51 +0300 [thread overview]
Message-ID: <105d75ed-0c98-8b58-123e-bfab34aebc3f@yandex.ru> (raw)
In-Reply-To: <20170908144657.GA3463@ACM>
On 9/8/17 5:46 PM, Alan Mackenzie wrote:
> While it is true that this hook is not absolutely necessary,
+1
> in that the
> cache switch could be made by the first call to syntax-ppss after the
> region change, it makes the cache switch clean. In particular, the
> cache will always be in synch with the region, and any functions which
> examine the cache at an arbitrary time (for example, jit-lock
> functions), will get the right cache.
Do we ever want the jit-lock code examining the cache contents directly?
> The mechanism will also work a
> little faster with the new hook than without it, given that changes of
> restriction are more rarely effected than syntax-ppss is called.
I don't imagine the performance difference will be in any way
noticeable. It's just one "if".
next prev parent reply other threads:[~2017-09-08 20:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-08 14:46 New hook before-region-change-functions wanted Alan Mackenzie
2017-09-08 15:07 ` John Wiegley
2017-09-08 15:10 ` Eli Zaretskii
2017-09-08 15:12 ` Alan Mackenzie
2017-09-08 20:47 ` Dmitry Gutov [this message]
2017-09-09 13:46 ` Stefan Monnier
2017-09-08 22:22 ` Richard Stallman
2017-09-09 8:33 ` Alan Mackenzie
2017-09-10 2:44 ` Richard Stallman
2017-09-10 7:37 ` Alan Mackenzie
2017-09-11 1:17 ` Richard Stallman
2017-09-11 16:45 ` Alan Mackenzie
2017-09-12 15:46 ` Andreas Röhler
2017-09-09 13:44 ` Stefan Monnier
2017-09-10 18:53 ` Alan Mackenzie
2017-09-10 22:21 ` Stefan Monnier
2017-09-10 23:02 ` Drew Adams
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