GNU bug report logs - #23443
25.0.93; Temporary change to syntax-table is in effect during syntax-propertize

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From: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
To: 23443 <at> debbugs.gnu.org
Subject: bug#23443: 25.0.93; Temporary change to syntax-table is in effect during syntax-propertize
Date: Fri, 13 May 2016 07:49:16 +0200

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|reopen| bugnumber

The proposed solution, which has to bind syntax-propertize-function to 
nil before calling scan-sexp, reads like a work around. These things 
shouldn't be necessary.

Assume a fix must affect usage of syntax-propertize-function and probably is not a trivial one.
Its design seems worth further discussion.

For example reading:

"The specified function may call ‘syntax-ppss’ on any position
before END, but it should not call ‘syntax-ppss-flush-cache’,
which means that it should not call ‘syntax-ppss’ on some
position and later modify the buffer on some earlier position."

Emacs can do better.

On 12.05.2016 12:05, Noam Postavsky wrote:
> close 23443
> tags 23443 + notabug
> quit
>
> On Sun, May 8, 2016 at 3:12 PM, Dmitry Gutov <dgutov <at> yandex.ru> wrote:
>> Here's a possible stopgap:
>>
>> - Narrow the buffer to the snippet (just to be safe).
>> - Bind syntax-propertize-function to nil.
>> - Call scan-sexps.
>> - Call (syntax-ppss-flush-cache snippet-beginning-position).
> Thanks, this seems to be working well (implemented in [1]).
>
> [1]: https://github.com/capitaomorte/yasnippet/pull/695
>
>
>

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