From: Dmitry Gutov <dgutov@yandex.ru>
To: 41195@debbugs.gnu.org
Subject: bug#41195: 27.0.91; Using syntax-ppss-flush-cache in syntax-propertize-function infloops
Date: Tue, 12 May 2020 02:32:37 +0300 [thread overview]
Message-ID: <1d616b0d-3e1b-5f72-da35-d0aa056322b4@yandex.ru> (raw)
In theory, syntax-propertize-function implementations shouldn't change
buffer syntax the way that would affect the current syntax-ppss cache.
Or if they do, they should clear the cache accordingly.
Unfortunately, using syntax-ppss-flush-cache for that purpose doesn't
work: it makes Emacs infloop.
To reproduce, apply this patch:
diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index 5ec3e94275..efe38049ab 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -2362,6 +2362,7 @@ js-syntax-propertize
(eval-when-compile (append "=({[,:;"
'(nil))))))
(put-text-property (match-beginning 1) (match-end 1)
'syntax-table (string-to-syntax "\"/"))
+ (syntax-ppss-flush-cache (match-beginning 0))
(js-syntax-propertize-regexp end)))))
("\`\(#\)!" (1 "< b"))
("<" (0 (ignore
and then edit a file with js-mode containing
a = /xyz/
next reply other threads:[~2020-05-11 23:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 23:32 Dmitry Gutov [this message]
2020-05-12 20:55 ` bug#41195: 27.0.91; Using syntax-ppss-flush-cache in syntax-propertize-function infloops Stefan Monnier
2020-05-12 21:05 ` Dmitry Gutov
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