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Subject: bug#22765: Missing interfaces for syntax of characters in buffers.
Resent-From: Alan Mackenzie <acm@HIDDEN>
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Date: Mon, 22 Feb 2016 11:12:12 +0000
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From: Alan Mackenzie <acm@HIDDEN>
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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).

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Alan Mackenzie <acm@HIDDEN>
Subject: bug#22765: Acknowledgement (Missing interfaces for syntax of
 characters in buffers.)
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Date: Mon, 22 Feb 2016 11:10:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#22765: Missing interfaces for syntax of characters in buffers.
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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 "(")))

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