From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Pascal J. Bourguignon" Newsgroups: gmane.emacs.help Subject: Re: use Elisp to improve your Elisp - some code issues Date: Sun, 02 Aug 2015 02:44:50 +0200 Organization: Informatimago Message-ID: <87614yv7r1.fsf@kuiper.lan.informatimago.com> References: <877fphvymu.fsf@kuiper.lan.informatimago.com> <87twsjv16p.fsf@kuiper.lan.informatimago.com> <87lhdvuhhy.fsf@kuiper.lan.informatimago.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1438476325 336 80.91.229.3 (2 Aug 2015 00:45:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 2 Aug 2015 00:45:25 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Aug 02 02:45:18 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZLhOw-0007vY-BK for geh-help-gnu-emacs@m.gmane.org; Sun, 02 Aug 2015 02:45:18 +0200 Original-Received: from localhost ([::1]:54998 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZLhOv-0002xs-Nw for geh-help-gnu-emacs@m.gmane.org; Sat, 01 Aug 2015 20:45:17 -0400 Original-Path: usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 34 Original-X-Trace: individual.net ATHyns983tcWGu5ZLkmQGgdvlGRxMUTtkCp4Dm3ErL5aCxC8nh Cancel-Lock: sha1:NzI2MmMyZTkwMGI0YjA4MjQ1NDVhNGFkNTZjNzhiYjI2OWRkZGNhYg== sha1:KyBq8q2GSUHI5bBAUOl2cCSXIjg= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Original-Xref: usenet.stanford.edu gnu.emacs.help:213914 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:106199 Archived-At: Emanuel Berg writes: > "Pascal J. Bourguignon" > writes: > >>> It would be more illustrative if you provide >>> a counterexample of the same construct which cannot >>> be caught by that or another regexp. It will be >>> interesting to see if that example is anything >>> I would put in my code, ever. >> >> It's easy. Try to simplify (- x x) for any sexp x, >> (assuming x doesn't side effect. Just something like >> (+ 2 y) or (+ (* a x x) (* b x) c). > > ...? > > The example was finding (if a a b). Didn't you say > regexps couldn't identify all such cases because of > lack of expressiveness with respect to the more > expressive Lisp? No. I said that if you went beyond those simple case, your regexp solution would break lamentably. -- __Pascal Bourguignon__ http://www.informatimago.com/ “The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.” -- Carl Bass CEO Autodesk