From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Major modes using `widen' is a good, even essential, programming practice. Date: Sun, 07 Aug 2022 21:00:40 +0300 Message-ID: <83o7wwvsqf.fsf@gnu.org> References: <6ae35c9306ade07b4c45@heytings.org> <835yj4xhh7.fsf@gnu.org> <83y1w0w0gk.fsf@gnu.org> <83pmhcvugm.fsf@gnu.org> <651cad2f-3ce3-22dd-0829-38dd3c46ec40@yandex.ru> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12528"; mail-complaints-to="usenet@ciao.gmane.io" Cc: acm@muc.de, gregory@heytings.org, emacs-devel@gnu.org To: Dmitry Gutov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Aug 07 20:02:09 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 1oKkbJ-00033B-7d for ged-emacs-devel@m.gmane-mx.org; Sun, 07 Aug 2022 20:02:09 +0200 Original-Received: from localhost ([::1]:47346 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oKkbI-0004zh-BW for ged-emacs-devel@m.gmane-mx.org; Sun, 07 Aug 2022 14:02:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59196) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oKka9-0004Fe-VF for emacs-devel@gnu.org; Sun, 07 Aug 2022 14:00:57 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:58478) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oKka9-0005jS-Dh; Sun, 07 Aug 2022 14:00:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=yYCEtOM6HVTzvju4SN3U+3PuDHHi2dMnmyNtM2xyTNU=; b=ojj1dvFqiKCj n2+p8Ub+ClmYTRXYfsmalBXBRbSf/+iTU5K/6/f4LMmCH0bM6C4mD58SwSAK8oIdpzRkV8fkj8dED tLJZo+EsefjIYO6irB96YDr8UfvTM6DrJNj+QlCPG7xR30/w8UI8d70G7kTiV808rSW3fXNGb2/Kj 8sKskI1ztnc2BvUfOiuGXIDenHFOWK1CVUIM8Xf3VmIF3vcweAjRPi6N1pRSZGqTsecdS/AeKRCpE VQmFUjgjYvuK/LEVdXaEfRuqANeCVfLSi4eQ+zTRFVUQoYnmAcNOnbCvLm+lEV9u1dSY/z0VFp1oN kmSnV4TvVjnVVad8f1Y9+g==; Original-Received: from [87.69.77.57] (port=4846 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oKka8-0002fx-T2; Sun, 07 Aug 2022 14:00:57 -0400 In-Reply-To: <651cad2f-3ce3-22dd-0829-38dd3c46ec40@yandex.ru> (message from Dmitry Gutov on Sun, 7 Aug 2022 20:53:58 +0300) 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:293224 Archived-At: > Date: Sun, 7 Aug 2022 20:53:58 +0300 > Cc: gregory@heytings.org, emacs-devel@gnu.org > From: Dmitry Gutov > > On 07.08.2022 20:23, Eli Zaretskii wrote: > >> What jit-lock/font-lock actually do at the moment is to widen, then use > >> syntax-ppss, i.e. in effect scan from BOB. > > Yes, and that's SLOOOWWWW! > > It's not slow on files of reasonable size. E.g. even if we take xdisp.c > (the file I've seen referred to in complaints on CC Mode's speed), > > (benchmark 1 '(save-excursion (parse-partial-sexp (point-min) > (point-max)))) > > reports 20-50 ms on my machine. It takes 0.5 sec here.