Subject: Fwd: bug#37452: 26.3; skip-syntax-forward doesn't work in python-mode

From: Amai Kinono <[email-masked]>
Date: Sun, 22 Sep 2019 21:37:45 +0800

---------- Forwarded message ---------
发件人： Amai Kinono <[email-masked]>
Date: 2019年9月20日周五 下午9:39
Subject: Re: bug#37452: 26.3; skip-syntax-forward doesn't work in
python-mode
To: Noam Postavsky <[email-masked]>

I just found that the `forward-same-syntax` command in subr.el did the same
thing, so it doesn't work in my example too. Maybe this should be fixed?

Noam Postavsky <[email-masked]> 于2019年9月19日周四 上午6:37写道：

> Amai Kinono <[email-masked]> writes:
>
> >   (defun skip-syntax ()
> >     (interactive)
> >     (skip-syntax-forward (char-to-string (char-syntax (char-after)))))
>
> If you look at char-syntax's docstring, you should see
>
>     If you’re trying to determine the syntax of characters in the buffer,
>     this is probably the wrong function to use, because it can’t take
>     ‘syntax-table’ text properties into account.  Consider using
>     ‘syntax-after’ instead.
>
> Which is exactly the situation you've encountered here: python-mode sets
> the syntax of the quote to string fence ("|") using a text property.
> This version of skip-syntax should work:
>
> (defun syntax-class-to-char (syntax-class)
>   (aref " .w_()'\"$\\/<>@!|" syntax-class))
>
> (defun skip-syntax ()
>   (interactive)
>   (skip-syntax-forward (char-to-string
>                         (syntax-class-to-char
>                          (syntax-class (syntax-after (point)))))))
>
> Although I'd say that the function syntax-class-to-char should be added
> to Emacs (in syntax.c, so that it can reuse syntax_code_spec).
>