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bug#20128: 24.4; Bad regex in composition-function-table hangs Emacs
From: |
Lars Ingebrigtsen |
Subject: |
bug#20128: 24.4; Bad regex in composition-function-table hangs Emacs |
Date: |
Fri, 02 Aug 2019 14:35:55 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Richard Wordingham <richard.wordingham@ntlworld.com> writes:
> 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.
(I'm going through old bug reports that unfortunately have not received
any responses yet.)
I don't think you can reasonably expect Emacs to work properly when you
have put invalid regexps into a function like that, so I'm closing this
bug as a "wontfix".
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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