GNU bug report logs - #53260
char-syntax differs in interpreter and bytecode

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Mattias Engdegård <mattiase <at> acm.org>, 53260 <at> debbugs.gnu.org
Subject: bug#53260: char-syntax differs in interpreter and bytecode
Date: Sat, 15 Jan 2022 09:46:30 -0500

Lars Ingebrigtsen [2022-01-15 09:36:16] wrote:
> Mattias Engdegård <mattiase <at> acm.org> writes:
>> Fchar_syntax and the bytecode Bchar_syntax differ:
>> Fchar_syntax calls SETUP_BUFFER_SYNTAX_TABLE. Bchar_syntax does not.
>> Bchar_syntax converts arguments to multibyte.  Fchar_syntax does not.
> [...]
>> And, most importantly, what would be the correct code?
> Hm.  Perhaps Stefan has an opinion; added to the CCs.

My past opinion is in its docstring:

    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.

The "can't" is because `char-syntax` doesn't know where the char comes from.

>> (I suppose char-syntax is rare enough that we could call Fchar_syntax
>> from Bchar_syntax and thus avoid any future divergence.)
> Used 172 times in-core, which isn't that rare...

I think he meant "rare" w.r.t dynamic count rather than static count.


        Stefan

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