From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#22884: 25.0.92; C/l mode editing takes waaaayy too long Date: Thu, 3 Mar 2016 23:18:23 +0000 Message-ID: <20160303231823.GD3822@acm.fritz.box> References: <56D72C35.4090708@cs.ucla.edu> <20160303124910.GA2852@acm.fritz.box> <83si07z451.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1457046984 18173 80.91.229.3 (3 Mar 2016 23:16:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 3 Mar 2016 23:16:24 +0000 (UTC) Cc: eggert@cs.ucla.edu, 22884@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Mar 04 00:16:12 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1abcTY-0004ia-Vj for geb-bug-gnu-emacs@m.gmane.org; Fri, 04 Mar 2016 00:16:09 +0100 Original-Received: from localhost ([::1]:37831 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcTY-0000hn-6H for geb-bug-gnu-emacs@m.gmane.org; Thu, 03 Mar 2016 18:16:08 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:45116) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcTU-0000hb-CM for bug-gnu-emacs@gnu.org; Thu, 03 Mar 2016 18:16:05 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1abcTT-0008Hz-BJ for bug-gnu-emacs@gnu.org; Thu, 03 Mar 2016 18:16:04 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:35231) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcTR-0008He-SH; Thu, 03 Mar 2016 18:16:01 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84) (envelope-from ) id 1abcTR-0006PK-Je; Thu, 03 Mar 2016 18:16:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bug-cc-mode@gnu.org Resent-Date: Thu, 03 Mar 2016 23:16:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 22884 X-GNU-PR-Package: emacs,cc-mode X-GNU-PR-Keywords: Original-Received: via spool by 22884-submit@debbugs.gnu.org id=B22884.145704695524302 (code B ref 22884); Thu, 03 Mar 2016 23:16:01 +0000 Original-Received: (at 22884) by debbugs.gnu.org; 3 Mar 2016 23:15:55 +0000 Original-Received: from localhost ([127.0.0.1]:60591 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1abcTK-0006Jc-SJ for submit@debbugs.gnu.org; Thu, 03 Mar 2016 18:15:55 -0500 Original-Received: from mail.muc.de ([193.149.48.3]:11049) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1abcTJ-0006Hj-6I for 22884@debbugs.gnu.org; Thu, 03 Mar 2016 18:15:53 -0500 Original-Received: (qmail 6638 invoked by uid 3782); 3 Mar 2016 23:15:52 -0000 Original-Received: from acm.muc.de (p579E89EE.dip0.t-ipconnect.de [87.158.137.238]) by colin.muc.de (tmda-ofmipd) with ESMTP; Fri, 04 Mar 2016 00:15:50 +0100 Original-Received: (qmail 1311 invoked by uid 1000); 3 Mar 2016 23:18:23 -0000 Content-Disposition: inline In-Reply-To: <83si07z451.fsf@gnu.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-Delivery-Agent: TMDA/1.1.12 (Macallan) X-Primary-Address: acm@muc.de X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:114369 Archived-At: Hello, Eli. On Thu, Mar 03, 2016 at 10:40:42PM +0200, Eli Zaretskii wrote: > > Date: Thu, 3 Mar 2016 12:49:10 +0000 > > From: Alan Mackenzie > > Cc: 22884@debbugs.gnu.org > > > emacs -Q config.h > > > M-x goto-line RET 1661 RET / / > > > On my six-year-old desktop the second '/' takes about 10 seconds to > > > echo. This sort of thing makes Emacs effectively unusable for editing > > > config.h. > > The problem is in config.h. At line 14, inside a comment, appears the > > following string: > > "(at your option) any later version." > > . The open paren is at column zero, so the fancy code in syntax.c then > > fails to recognise the comment as a comment. > I think we should change syntax.c to fix this. (Alternatively, CC > mode could stop depending on it, but I doubt this is a viable > alternative.) We cannot really tell people we don't support such > files, as they are valid C code. Would it be practicable to mark comments with text properties? Say, a property called `comment-depth' which would be either nil (meaning currently unknown), 0 (definitely not in a comment), 1 (definitely in a comment), 2 (in a nested comment), 3, ...... ? That way we could always scan comments in the forwards direction (which is easy) - if we need to go backwards over a comment without the property, we can just go back to a known point and scan forward. Or would this just overwhelm the text property mechanism? -- Alan Mackenzie (Nuremberg, Germany).