From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Regexp search: syntax class for comment starter (\s<) does not work consistently in all modes Date: Tue, 01 Oct 2019 21:44:14 -0400 Message-ID: References: <20190927202211.3onie75t3ydknsmb@peruna.fi> <20191001200840.6p3fi2wsmnbxacnl@peruna.fi> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="1884"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Oct 02 04:01:35 2019 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iFTxO-0000Lo-1d for geh-help-gnu-emacs@m.gmane.org; Wed, 02 Oct 2019 04:01:34 +0200 Original-Received: from localhost ([::1]:50500 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iFTxL-0006NN-KA for geh-help-gnu-emacs@m.gmane.org; Tue, 01 Oct 2019 22:01:31 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34375) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iFTgn-0007RU-GJ for help-gnu-emacs@gnu.org; Tue, 01 Oct 2019 21:44:28 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iFTgm-0002rB-8Y for help-gnu-emacs@gnu.org; Tue, 01 Oct 2019 21:44:25 -0400 Original-Received: from 195-159-176-226.customer.powertech.no ([195.159.176.226]:54246 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iFTgl-0002mk-S3 for help-gnu-emacs@gnu.org; Tue, 01 Oct 2019 21:44:24 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.89) (envelope-from ) id 1iFTgi-000qmR-CQ for help-gnu-emacs@gnu.org; Wed, 02 Oct 2019 03:44:20 +0200 X-Injected-Via-Gmane: http://gmane.org/ Cancel-Lock: sha1:lK06Gn/Re2mJyJ17eGFT/XIav3w= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:121592 Archived-At: > by the way, at least in lisp-mode, \s< finds ";" > inside a string as well). Indeed, as I said, \s< only denotes those characters which the syntax tables says "can" start a comment. Whether they do depends on where they are. > I'm still pretty confused how bat-mode, for example, works as the > syntax table doesn't contain < syntax. There is no single char which starts a comment in bat-mode, since the comment delimiter is composed of 3 characters ("rem") and only in some places (e.g. "remember" doesn't count as a comment, even though it starts with "rem"). Syntax-tables can handle 2-char comment delimiters (which covers languages like C), and for more complex cases such as bat-mode's you have to use `syntax-propertize-function` as does `bat--syntax-propertize` to apply a `<` syntax to those `r` characters which are part of the magic "rem" sequence. You might like to read the syntax-tables chapter in the Elisp manual. Stefan