From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: New hook before-region-change-functions wanted Date: Sat, 09 Sep 2017 09:46:11 -0400 Message-ID: References: <20170908144657.GA3463@ACM> <105d75ed-0c98-8b58-123e-bfab34aebc3f@yandex.ru> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1505311914 13668 195.159.176.226 (13 Sep 2017 14:11:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 13 Sep 2017 14:11:54 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Sep 09 15:50:46 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dqg9W-00066u-Mk for ged-emacs-devel@m.gmane.org; Sat, 09 Sep 2017 15:50:30 +0200 Original-Received: from localhost ([::1]:49546 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqg9d-0005Uj-WA for ged-emacs-devel@m.gmane.org; Sat, 09 Sep 2017 09:50:38 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:53670) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqg9Y-0005UQ-2k for emacs-devel@gnu.org; Sat, 09 Sep 2017 09:50:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dqg9T-0002cM-7q for emacs-devel@gnu.org; Sat, 09 Sep 2017 09:50:32 -0400 Original-Received: from [195.159.176.226] (port=52878 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dqg9T-0002by-0I for emacs-devel@gnu.org; Sat, 09 Sep 2017 09:50:27 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1dqg97-0004wO-II for emacs-devel@gnu.org; Sat, 09 Sep 2017 15:50:05 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 13 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:kFccyBkXEcVY7a/Zl9dT0NxW6mo= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:218185 >> 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". Furthermore, this `if` will avoid two cache switches when a save-restriction+widen happens between two syntax-ppss calls. All in all, I think both approaches would work equally well, Stefan