From: "Mattias Engdegård" <mattiase@acm.org>
To: 53260@debbugs.gnu.org
Subject: bug#53260: char-syntax differs in interpreter and bytecode
Date: Fri, 14 Jan 2022 17:43:00 +0100 [thread overview]
Message-ID: <0A87E4BA-4741-4688-A005-912ABFC86B83@acm.org> (raw)
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.
The last property can be used to get different behaviour:
(let ((cs (byte-compile (lambda (x) (char-syntax x)))))
(with-temp-buffer
(let ((st (make-syntax-table)))
(set-buffer-multibyte nil)
(modify-syntax-entry 128 "_" st)
(set-syntax-table st)
(list (funcall cs 128) (char-syntax 128)))))
-> (119 95)
Not sure how to expose the presence or absence of SETUP_BUFFER_SYNTAX_TABLE. Suggestions?
And, most importantly, what would be the correct code?
(I suppose char-syntax is rare enough that we could call Fchar_syntax from Bchar_syntax and thus avoid any future divergence.)
next reply other threads:[~2022-01-14 16:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 16:43 Mattias Engdegård [this message]
2022-01-15 8:36 ` bug#53260: char-syntax differs in interpreter and bytecode Lars Ingebrigtsen
2022-01-15 14:46 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-15 17:29 ` Mattias Engdegård
2022-01-15 17:57 ` Eli Zaretskii
2022-01-15 22:51 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-16 11:04 ` bug#53260: char-syntax differs in interpreter and bytecode [PATCH] Mattias Engdegård
2022-01-20 9:30 ` Lars Ingebrigtsen
2022-01-20 10:47 ` Mattias Engdegård
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