From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#20128: 24.4; Bad regex in composition-function-table hangs Emacs Date: Fri, 02 Aug 2019 14:35:55 +0200 Message-ID: <87blx7rbh0.fsf@mouse.gnus.org> References: <20150317194504.7a0fca78@JRWUBU2> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="129827"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: 20128@debbugs.gnu.org To: Richard Wordingham Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Aug 02 14:37:10 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1htWo1-000XaS-I9 for geb-bug-gnu-emacs@m.gmane.org; Fri, 02 Aug 2019 14:37:09 +0200 Original-Received: from localhost ([::1]:34538 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htWo0-0004l1-EE for geb-bug-gnu-emacs@m.gmane.org; Fri, 02 Aug 2019 08:37:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40004) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1htWnv-0004kd-Gu for bug-gnu-emacs@gnu.org; Fri, 02 Aug 2019 08:37:04 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1htWnu-0006RI-FT for bug-gnu-emacs@gnu.org; Fri, 02 Aug 2019 08:37:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:47190) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1htWnu-0006RA-Bz for bug-gnu-emacs@gnu.org; Fri, 02 Aug 2019 08:37:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1htWnt-00070N-OX for bug-gnu-emacs@gnu.org; Fri, 02 Aug 2019 08:37:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 02 Aug 2019 12:37:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 20128 X-GNU-PR-Package: emacs Original-Received: via spool by 20128-submit@debbugs.gnu.org id=B20128.156474936226800 (code B ref 20128); Fri, 02 Aug 2019 12:37:01 +0000 Original-Received: (at 20128) by debbugs.gnu.org; 2 Aug 2019 12:36:02 +0000 Original-Received: from localhost ([127.0.0.1]:56007 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1htWmw-0006yB-Fw for submit@debbugs.gnu.org; Fri, 02 Aug 2019 08:36:02 -0400 Original-Received: from quimby.gnus.org ([80.91.231.51]:58126) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1htWmu-0006xk-MG for 20128@debbugs.gnu.org; Fri, 02 Aug 2019 08:36:01 -0400 Original-Received: from 77.18.62.220.tmi.telenormobil.no ([77.18.62.220] helo=sandy) by quimby.gnus.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1htWmq-0001yy-Kr; Fri, 02 Aug 2019 14:35:59 +0200 In-Reply-To: <20150317194504.7a0fca78@JRWUBU2> (Richard Wordingham's message of "Tue, 17 Mar 2015 19:45:04 +0000") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:164337 Archived-At: Richard Wordingham 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