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Fix slow abbrev expansion in `message-mode' in some circumstances

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* lisp/gnus/message.el (message--syntax-propertize): Use the
correct Message mode syntax table to avoid having
`message-cite-prefix-regexp' trigger very heavy backtracing when
called from an abbrev context (which defines "_" as a word
constituent) (bug#45944).
This commit is contained in:
Lars Ingebrigtsen 2021-01-19 16:07:54 +01:00
parent e544b86343
commit 3b731b123d
1 changed files with 17 additions and 16 deletions
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33
lisp/gnus/message.el
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@ -3057,22 +3057,23 @@ See also `message-forbidden-properties'."
(defun message--syntax-propertize (beg end)
"Syntax-propertize certain message text specially."
(let ((citation-regexp (concat "^" message-cite-prefix-regexp ".*$"))
(smiley-regexp (regexp-opt message-smileys)))
(goto-char beg)
(while (search-forward-regexp citation-regexp
end 'noerror)
(let ((start (match-beginning 0))
(end (match-end 0)))
(add-text-properties start (1+ start)
`(syntax-table ,(string-to-syntax "<")))
(add-text-properties end (min (1+ end) (point-max))
`(syntax-table ,(string-to-syntax ">")))))
(goto-char beg)
(while (search-forward-regexp smiley-regexp
end 'noerror)
(add-text-properties (match-beginning 0) (match-end 0)
`(syntax-table ,(string-to-syntax "."))))))
(with-syntax-table message-mode-syntax-table
(let ((citation-regexp (concat "^" message-cite-prefix-regexp ".*$"))
(smiley-regexp (regexp-opt message-smileys)))
(goto-char beg)
(while (search-forward-regexp citation-regexp
end 'noerror)
(let ((start (match-beginning 0))
(end (match-end 0)))
(add-text-properties start (1+ start)
`(syntax-table ,(string-to-syntax "<")))
(add-text-properties end (min (1+ end) (point-max))
`(syntax-table ,(string-to-syntax ">")))))
(goto-char beg)
(while (search-forward-regexp smiley-regexp
end 'noerror)
(add-text-properties (match-beginning 0) (match-end 0)
`(syntax-table ,(string-to-syntax ".")))))))
;;;###autoload
(define-derived-mode message-mode text-mode "Message"