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: [PATCH] Re: cc-mode fontification feels random Date: Mon, 30 Aug 2021 19:18:17 +0000 Message-ID: References: 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="35508"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: "Perry E. Metzger" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 30 21:19:57 2021 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 1mKmp2-000941-GU for ged-emacs-devel@m.gmane-mx.org; Mon, 30 Aug 2021 21:19:56 +0200 Original-Received: from localhost ([::1]:49128 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mKmp1-0003TD-Hk for ged-emacs-devel@m.gmane-mx.org; Mon, 30 Aug 2021 15:19:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53234) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mKmnW-00026Z-99 for emacs-devel@gnu.org; Mon, 30 Aug 2021 15:18:22 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:60329 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1mKmnU-00075x-7N for emacs-devel@gnu.org; Mon, 30 Aug 2021 15:18:22 -0400 Original-Received: (qmail 76431 invoked by uid 3782); 30 Aug 2021 19:18:18 -0000 Original-Received: from acm.muc.de (p4fe15b65.dip0.t-ipconnect.de [79.225.91.101]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Mon, 30 Aug 2021 21:18:17 +0200 Original-Received: (qmail 8293 invoked by uid 1000); 30 Aug 2021 19:18:17 -0000 Content-Disposition: inline In-Reply-To: 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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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:273539 Archived-At: Hello, Perry. On Mon, Aug 30, 2021 at 15:03:43 -0400, Perry E. Metzger wrote: > On 8/30/21 14:50, Alan Mackenzie wrote: > >> For years and years now, I've been thinking we just need more > >> deterministic parser-and-based mode support, and I still think that, but > >> on a realistic level, that doesn't seem to be coming any time soon. > I note that Tree Sitter integration is in active development now... Yes. At some time in the future it will work, presumably well. > >> In the meantime, is there any general approach we might be able to use > >> to get stuff like the attached to stop happening? > > Here, "stuff like the attached" was having some types correctly > > fontified, others not. This was due to the order, somewhat random, in > > which a type is recognised as such and entered into a CC Mode table, and > > its use being scanned in a jit-lock chunk. > > The following patch is an attempt to improve this situation. > I think we are inevitably hitting the wall here, because it is not > possible to parse a context free grammar with regular expressions. One > can only move around the suck, one can't actually remove it without > parsing the underlying language. I'm not aiming at perfection. It's a fairly simple hack whose aim is to reduce the level of Daniel's (and others') irritation. I think there's now a general understanding that parsing the language is needed for accurate fontification (and indentation). But that is some way off, yet. > Perry -- Alan Mackenzie (Nuremberg, Germany).