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: [Emacs-diffs] master c66aaa6: Recomplexify =?utf-8?Q?=E2=80=98delete-trailing-whitespace=E2=80=99?= by treating \n as whitespace again Date: Wed, 15 Mar 2017 10:50:14 -0400 Message-ID: References: <20170315023157.29463.36647@vcs0.savannah.gnu.org> <20170315023159.30AA520CAB@vcs0.savannah.gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: blaine.gmane.org 1489589472 2893 195.159.176.226 (15 Mar 2017 14:51:12 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 15 Mar 2017 14:51:12 +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 Wed Mar 15 15:51:08 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 1coAGV-0008TX-Kz for ged-emacs-devel@m.gmane.org; Wed, 15 Mar 2017 15:51:03 +0100 Original-Received: from localhost ([::1]:37878 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coAGb-0004Kt-PH for ged-emacs-devel@m.gmane.org; Wed, 15 Mar 2017 10:51:09 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:47359) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coAG6-0004Kf-Uz for emacs-devel@gnu.org; Wed, 15 Mar 2017 10:50:39 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1coAG3-0005j7-1x for emacs-devel@gnu.org; Wed, 15 Mar 2017 10:50:38 -0400 Original-Received: from [195.159.176.226] (port=51445 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1coAG2-0005ip-RI for emacs-devel@gnu.org; Wed, 15 Mar 2017 10:50:34 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1coAFn-0004mO-JI for emacs-devel@gnu.org; Wed, 15 Mar 2017 15:50:19 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 14 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:BWcKmoYrAGgsgUYr2oEu8k2FwSc= 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:213038 Archived-At: >>> Recomplexify ‘delete-trailing-whitespace’ by treating \n as >>> whitespace again >>> Mostly reverts "Simplify ‘delete-trailing-whitespace’ by not treating >>> \n as whitespace" from 2016-07-04. Setting \n to non-whitespace >>> causes the regex engine to backtrack a lot when searching for >>> "\\s-+$" (Bug#26079). >> Why do we use syntax-tables? >> IOW why do we use \s- rather than something like [\s\t]? > No clue. But (re-search-forward "[\s\t]+$" nil t) is also slow. Slower than "\\s-+$"? Stefan