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bug#20128: 24.4; Bad regex in composition-function-table hangs Emacs
From: |
Richard Wordingham |
Subject: |
bug#20128: 24.4; Bad regex in composition-function-table hangs Emacs |
Date: |
Tue, 17 Mar 2015 19:45:04 +0000 |
Loading an Emacs lisp file (e.g. by load-file in .emacs) containing the
commands:
(defvar tai-tham-composable-pattern
(let ((table
'(
("C" . "[\u1A20-\u1A54") ; Missing ']'!
("M" . "[\u1A55-\u1A5E\u1A61-\u1A7C\u1A7F]"); Mark
("H" . "\u1A60") ; sakot
("N" . "\u1A58"))) ; mai kang lai
(regexp "C\\(M|HC\\)*\\(NC\\(M|HC\\)*\\)*N?"))
(let ((case-fold-search nil))
(dolist (elt table)
(setq regexp (replace-regexp-in-string (car elt) (cdr elt)
regexp t t))))
regexp))
(let ((elt (list (vector tai-tham-composable-pattern 0
'font-shape-gstring)
(vector "." 0 'font-shape-gstring) )))
(set-char-table-range composition-function-table '(#x1A20 . #x1AAD)
elt))
causes Emacs to hang when a character in the range U+1A20 to U+1AAD
needs to be rendered. Now, the value of tai-tham-composable-pattern is
an unbalanced regex, so that may be the cause of the problem.
The problem also occurs in Emacs 23.3.
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