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From: npostavs@HIDDEN
To: Alan Mackenzie <acm@HIDDEN>
Subject: Re: bug#22765: Missing interfaces for syntax of characters in buffers.
References: <20160222111212.GC1984@HIDDEN>
Date: Wed, 05 Apr 2017 20:43:44 -0400
In-Reply-To: <20160222111212.GC1984@HIDDEN> (Alan Mackenzie's message
of "Mon, 22 Feb 2016 11:12:12 +0000")
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Alan Mackenzie <acm@HIDDEN> writes:
> We have `char-syntax', but that takes no account of syntax-table text
> properties which might be on a buffer position, and so shouldn't really
> be used any more in buffers. There are still around 160 uses of
> `char-syntax' in our sources.
I'm afraid I added another one in my recent `indent-sexp' changes. We
should at least add a warning about this to the docstring.
> We have `syntax-after', but this returns a raw syntax descriptor (like
> (4 . 41)), and we have no means of extracting ?\( from this.
>
> I propose adding the two functions `syntax-class-to-char' which would
> convert 4 to ?\(, and `char-syntax-after', which would return ?\(
> directly, given a buffer position with such a character under it.
We do have string-to-syntax which can be used to convert in the other
direction, although code using it would end up a bit more verbose.
(eq (char-syntax-after POS) ?\()
vs
(eq (syntax-class (syntax-after POS)) (car (string-to-syntax "(")))
bug-gnu-emacs@HIDDEN:bug#22765; Package emacs.
Full text available.Received: (at submit) by debbugs.gnu.org; 22 Feb 2016 11:10:00 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Feb 22 06:10:00 2016 Received: from localhost ([127.0.0.1]:36863 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1aXoNL-0001zL-Q0 for submit <at> debbugs.gnu.org; Mon, 22 Feb 2016 06:09:59 -0500 Received: from eggs.gnu.org ([208.118.235.92]:34030) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from <acm@HIDDEN>) id 1aXoNL-0001z8-5d for submit <at> debbugs.gnu.org; Mon, 22 Feb 2016 06:09:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <acm@HIDDEN>) id 1aXoNF-0000lx-1n for submit <at> debbugs.gnu.org; Mon, 22 Feb 2016 06:09:53 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:40443) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <acm@HIDDEN>) id 1aXoNE-0000lr-VJ for submit <at> debbugs.gnu.org; Mon, 22 Feb 2016 06:09:52 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53199) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <acm@HIDDEN>) id 1aXoNE-0006bH-2R for bug-gnu-emacs@HIDDEN; Mon, 22 Feb 2016 06:09:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <acm@HIDDEN>) id 1aXoN9-0000jS-3n for bug-gnu-emacs@HIDDEN; Mon, 22 Feb 2016 06:09:52 -0500 Received: from mail.muc.de ([193.149.48.3]:52206) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <acm@HIDDEN>) id 1aXoN8-0000gc-QF for bug-gnu-emacs@HIDDEN; Mon, 22 Feb 2016 06:09:47 -0500 Received: (qmail 19983 invoked by uid 3782); 22 Feb 2016 11:09:45 -0000 Received: from acm.muc.de (p548A53D7.dip0.t-ipconnect.de [84.138.83.215]) by colin.muc.de (tmda-ofmipd) with ESMTP; Mon, 22 Feb 2016 12:09:44 +0100 Received: (qmail 2750 invoked by uid 1000); 22 Feb 2016 11:12:12 -0000 Date: Mon, 22 Feb 2016 11:12:12 +0000 To: bug-gnu-emacs@HIDDEN Subject: Missing interfaces for syntax of characters in buffers. Message-ID: <20160222111212.GC1984@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) X-Delivery-Agent: TMDA/1.1.12 (Macallan) From: Alan Mackenzie <acm@HIDDEN> X-Primary-Address: acm@HIDDEN X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.4 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -4.4 (----) Hello, Emacs. In all versions of Emacs to date, we are missing an interface to return the syntax of a character in a buffer in a "nice" form. By a "nice" form, I mean the characters ?\ , ?., ?w, ?\(, ?\), etc., which programs should be able to use. We have `char-syntax', but that takes no account of syntax-table text properties which might be on a buffer position, and so shouldn't really be used any more in buffers. There are still around 160 uses of `char-syntax' in our sources. We have `syntax-after', but this returns a raw syntax descriptor (like (4 . 41)), and we have no means of extracting ?\( from this. I propose adding the two functions `syntax-class-to-char' which would convert 4 to ?\(, and `char-syntax-after', which would return ?\( directly, given a buffer position with such a character under it. This would greatly aid in the conversion of these old `char-syntax' calls. -- Alan Mackenzie (Nuremberg, Germany).
Alan Mackenzie <acm@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#22765; Package emacs.
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