From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Vinicius Jose Latorre Newsgroups: gmane.emacs.devel Subject: Re: Possible problem with looking-back function Date: Thu, 19 Aug 2010 23:11:29 -0300 Message-ID: <4C6DE451.5080706@ig.com.br> References: <4C6C85AD.1010500@ig.com.br> <49933.130.55.132.107.1282185810.squirrel@webmail.lanl.gov> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1282270124 7096 80.91.229.12 (20 Aug 2010 02:08:44 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 20 Aug 2010 02:08:44 +0000 (UTC) Cc: GNU Emacs To: herring@lanl.gov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Aug 20 04:08:41 2010 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1OmH26-00038I-HS for ged-emacs-devel@m.gmane.org; Fri, 20 Aug 2010 04:08:38 +0200 Original-Received: from localhost ([127.0.0.1]:55771 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OmH26-00016i-04 for ged-emacs-devel@m.gmane.org; Thu, 19 Aug 2010 22:08:38 -0400 Original-Received: from [140.186.70.92] (port=34470 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OmH20-00016d-AA for emacs-devel@gnu.org; Thu, 19 Aug 2010 22:08:33 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OmH1z-00051W-3y for emacs-devel@gnu.org; Thu, 19 Aug 2010 22:08:32 -0400 Original-Received: from mail-gw0-f41.google.com ([74.125.83.41]:53623) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OmH1z-00051P-0r for emacs-devel@gnu.org; Thu, 19 Aug 2010 22:08:31 -0400 Original-Received: by gwj16 with SMTP id 16so1234296gwj.0 for ; Thu, 19 Aug 2010 19:08:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=jXOPXe9UPDu0gSrT98SJXxAki8ZsrYpgQJdjJIOG53Q=; b=MLXRFk5p4bmwnkFHqzXcz2w/vcAlbHvxHVU0DlAQC+/IjP/zNPtVz6HH+im3zUQQ0P UPc1UcJZORCN+5k6DLpV6HVbogfVR0GdFzDhvlAxyoVcLHVFYoX2J3RXbBfd8ND6P/Pj cdkHM8J0PCvOCuOQlzA3w4DKQcbAoGIs4+RiI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=jiuK58Sr8UDvnHREfgbGMCvjRrT/95x7+kZuTf7kpLo2VzXJbA8w62NwbbntGVlxpe PBBLGSt+TnHJ16awI/AYIZuoBEwcPjQ8Sugf+Y8jZ9/qvYmxPCiez8L8lh56MjgSbywJ Qto0NSYxz2+nf2szy8VeyGafZmYS5ZXt+qOyk= Original-Received: by 10.101.171.39 with SMTP id y39mr734564ano.259.1282270109811; Thu, 19 Aug 2010 19:08:29 -0700 (PDT) Original-Received: from [192.168.0.101] ([201.82.128.214]) by mx.google.com with ESMTPS id 14sm3476768ant.1.2010.08.19.19.08.27 (version=TLSv1/SSLv3 cipher=RC4-MD5); Thu, 19 Aug 2010 19:08:28 -0700 (PDT) User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.11) Gecko/20100701 SeaMonkey/2.0.6 In-Reply-To: <49933.130.55.132.107.1282185810.squirrel@webmail.lanl.gov> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:128895 Archived-At: >> Shouldn't it return 1? > > The algorithm searches backward until it finds a position from which there > is a match that extends to point. Doing more would be quadratic in the > value of point (at least), so is considered too slow. Ok, so looking-back should be replaced by: (progn (goto-char 11) ; go to end of buffer ;; ---- looking-back replacement --- BEGIN (save-excursion (when (/= 0 (skip-chars-backward " \t\n" 1)) (unless (bolp) (forward-line 1)) (looking-at "^\\([ \t\n]+\\)"))) ;; ---- looking-back replacement --- END (match-beginning 1)) Now it returns 1.