From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: New optimisations for long raw strings in C++ Mode. Date: Wed, 10 Aug 2022 17:32:46 +0000 Message-ID: References: <87fsi5xw9l.fsf@gnus.org> <83wnbhtlzb.fsf@gnu.org> <703c2351d96919276449@heytings.org> <83o7wsqlcm.fsf@gnu.org> <83edxoqcnl.fsf@gnu.org> <83a68cqbm0.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40584"; mail-complaints-to="usenet@ciao.gmane.io" Cc: gregory@heytings.org, larsi@gnus.org, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Aug 10 19:37:16 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oLpds-000AML-8R for ged-emacs-devel@m.gmane-mx.org; Wed, 10 Aug 2022 19:37:16 +0200 Original-Received: from localhost ([::1]:56352 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oLpdq-0001l6-RJ for ged-emacs-devel@m.gmane-mx.org; Wed, 10 Aug 2022 13:37:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oLpZb-000064-Pb for emacs-devel@gnu.org; Wed, 10 Aug 2022 13:32:52 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:38018 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1oLpZZ-0004kt-OT for emacs-devel@gnu.org; Wed, 10 Aug 2022 13:32:51 -0400 Original-Received: (qmail 31532 invoked by uid 3782); 10 Aug 2022 17:32:47 -0000 Original-Received: from acm.muc.de (p4fe15888.dip0.t-ipconnect.de [79.225.88.136]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Wed, 10 Aug 2022 19:32:46 +0200 Original-Received: (qmail 7386 invoked by uid 1000); 10 Aug 2022 17:32:46 -0000 Content-Disposition: inline In-Reply-To: <83a68cqbm0.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.1; envelope-from=acm@muc.de; helo=mail.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:293364 Archived-At: Hello, Eli. On Wed, Aug 10, 2022 at 19:58:31 +0300, Eli Zaretskii wrote: > > Date: Wed, 10 Aug 2022 16:50:43 +0000 > > Cc: gregory@heytings.org, larsi@gnus.org, emacs-devel@gnu.org > > From: Alan Mackenzie > > On Wed, Aug 10, 2022 at 19:35:58 +0300, Eli Zaretskii wrote: > > > > Date: Wed, 10 Aug 2022 16:23:27 +0000 > > > > Cc: gregory@heytings.org, larsi@gnus.org, emacs-devel@gnu.org > > > > From: Alan Mackenzie > > > > CC Mode has not been doing anything wrong in accessing the buffers it > > > > controls. The idea that one should access only the characters in the > > > > (BEG END) supplied by fontification_functions (and jit-lock) is false. > > > > It has no basis in rationality. And in fact, standard font-locking > > > > itself accesses (via syntax-ppss) all character positions from BOB to > > > > BEG. > > > You seem to disagree with a major idea of the design of the Emacs > > > display engine. > > I don't think I do. I think you mean the idea of lazy fontification, > > though you haven't been specific. > No, I mean the idea that redisplay processes only a small amount of > buffer text around the window. I don't think such an idea is coherent, due to the lack of precision of the word "processes". I understand that redisplay _fontifies_ only a small amount of buffer text. However, it can get better results if it is free to _look_ at text anywhere in the buffer. You seem to be conflating "fontifying" with "looking at". I don't think that's helpful. > > This fontification is all about fontifying restricted areas of the > > buffer. There is no principle that one shouldn't look at distant > > portions of the buffer as need be, to facilitate the fontification of > > the restricted area. > You are contradicting yourself. I can't see any contradiction in what I wrote there. > > This is absolutely necessary correctly to fontify (long) strings and > > comments, for example. > Only if you assume the most simplistic processing. If you open a file in its middle (e.g., by desktop), and there's an open block comment there, you've got to look arbitrarily far back to detect that state. In practice parse-partial-sexp from point-min will be used, likely with cacheing of whatever sort. -- Alan Mackenzie (Nuremberg, Germany).