From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Robert Thorpe" Newsgroups: gmane.emacs.help Subject: Re: State-machine based syntax highlighting Date: 7 Dec 2006 10:57:18 -0800 Organization: http://groups.google.com Message-ID: <1165517838.526624.171950@f1g2000cwa.googlegroups.com> References: <1165472049.496117.320630@79g2000cws.googlegroups.com> <1165488825.132862.189340@79g2000cws.googlegroups.com> <1165492567.864982.59980@79g2000cws.googlegroups.com> <1165495364.560960.271250@f1g2000cwa.googlegroups.com> <1165501630.172348.157180@j72g2000cwa.googlegroups.com> <1165502373.932709.15860@79g2000cws.googlegroups.com> <1165510932.276718.251220@73g2000cwn.googlegroups.com> <1165516558.657188.21610@j44g2000cwa.googlegroups.com> NNTP-Posting-Host: dough.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-Trace: sea.gmane.org 1165520450 23464 80.91.229.10 (7 Dec 2006 19:40:50 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Thu, 7 Dec 2006 19:40:50 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Dec 07 20:40:49 2006 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by dough.gmane.org with esmtp (Exim 4.50) id 1GsP6m-00083m-E9 for geh-help-gnu-emacs@m.gmane.org; Thu, 07 Dec 2006 20:40:40 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GsP6m-0001mv-1C for geh-help-gnu-emacs@m.gmane.org; Thu, 07 Dec 2006 14:40:40 -0500 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!postnews.google.com!f1g2000cwa.googlegroups.com!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 35 Original-NNTP-Posting-Host: 213.94.228.210 Original-X-Trace: posting.google.com 1165517844 2863 127.0.0.1 (7 Dec 2006 18:57:24 GMT) Original-X-Complaints-To: groups-abuse@google.com Original-NNTP-Posting-Date: Thu, 7 Dec 2006 18:57:24 +0000 (UTC) In-Reply-To: <1165516558.657188.21610@j44g2000cwa.googlegroups.com> User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.10) Gecko/20050716 Firefox/1.0.6,gzip(gfe),gzip(gfe) X-HTTP-Via: 1.0 EMF3ASPROXY03 Complaints-To: groups-abuse@google.com Injection-Info: f1g2000cwa.googlegroups.com; posting-host=213.94.228.210; posting-account=hWoAPxMAAAAnBKSBz1ZivwUPPjEuve7bvVCHZQ8rhrluPfwcBJd92w Original-Xref: shelby.stanford.edu gnu.emacs.help:143731 Original-To: help-gnu-emacs@gnu.org X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:39333 Archived-At: spamfilteraccount@gmail.com wrote: > Stefan Monnier wrote: > > > > Actually, font-locking *is* implemented in C. The elisp part usually takes > > a negligible amount of time. The problem start appearing when the > > functionality of the C code is not sufficient and you start trying to parse > > the code in elisp, which is slow. > > Good to know. I thought font-lock was implemented in elisp and didn't > bother to check. Precisely speaking... The code that determines what rules are used to font-lock text is in Elisp. The regexp engine that finds the things to be font-locked is in the core of Emacs. The colourisation is implemented in the Emacs core. Overall this means that most of the work is in the Emacs core. If parsing were to be used to support syntax highlighting then maybe some work would have to be done to avoid having to use Elisp. But I'm not sure since it would still require loads of regexps and they would probably still eat up a lot of the runtime. > BTW, I checked the situation in the enemy camp and seems they also have > problems with performance: Almost every editor does with both large files and syntactically complex languages. As far as I know, Emacs is a little slower than Vim at least in some cases. If you want to avoid the problem then use <4000 line files and write your programs in Lisp. Those are good things to do anyway ;)