From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: cond* Date: Mon, 08 Jan 2024 15:13:10 +0000 Message-ID: <87wmsjyi2h.fsf@localhost> References: <87frzuae9n.fsf@posteo.net> <871qbatqc8.fsf@posteo.net> <87wmsz7lzn.fsf@posteo.net> <87edf1m7lq.fsf@localhost> <87cyui76l9.fsf@localhost> <871qauy1io.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9602"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: rms@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Jan 08 16:10:55 2024 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rMrHA-0002EX-VZ for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Jan 2024 16:10:53 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rMrGR-0000gB-9n; Mon, 08 Jan 2024 10:10:08 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rMrGO-0000fs-UL for emacs-devel@gnu.org; Mon, 08 Jan 2024 10:10:05 -0500 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rMrGM-00070Q-0G for emacs-devel@gnu.org; Mon, 08 Jan 2024 10:10:03 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 5E2E7240027 for ; Mon, 8 Jan 2024 16:09:58 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1704726598; bh=d0m7nRejf2ZuYtXcjbU8rk332nb1cLUf7wLVrtX8Ugc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=pH+S2CDFBolPznBTllHZM4ktOyo6jTYh5emON0sg0XLHlGvg3uqa5QafiiRgJihQu ueoBEsCn3/qmaQPIdkSYIOCXxTH5qHZrOEebRHhNAX94mOeZxDXWYDc9zDGfZHebMC Gh4JkbxUqJP+gm2CE4UsUOknqMzAt0+AEuPSH58t5124fkWGXBJBDUDqh+XVLYtQJb H3OYJ0ptvD3OLl/cLyVQTG1QpcTfEtCF+yAyozhRg2cSih+kPnkwzzQTzcRGg/ZXAC AyEAoXdJgBs2GmX14Gz8dRoaBz3VvS986nAs3CRVY5Ekc2apOe2AoqKN9wZRMaPmR+ /Qa0LT02yWNVQ== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4T7yCn4sg4z6tsg; Mon, 8 Jan 2024 16:09:57 +0100 (CET) In-Reply-To: Received-SPF: pass client-ip=185.67.36.65; envelope-from=yantar92@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:314747 Archived-At: Richard Stallman writes: > > >From my reading of your latest spec of the cond*, I feel that it is > > getting closer and closer to the features provided by `pcase'. The > > description is also getting closer to pcase manual page length. > > After eliminating the nested constrained variables, it is only 213 lines. > > Are there any pcase features that cond* does not provide an equivalent > for? Other than rx, one missing feature is an ability to match against multiple values in a single condition: (defun yant/list-sum (list) (apply #'+ list)) (pcase '(1 2 3) ((and `(,x ,y ,z) (app yant/list-sum (and sum (guard (< 2 sum))))) (format "%d + %d + %d = %d; 2 is < %d" x y z sum sum))) ; => "1 + 2 + 3 = 6; 2 is < 6" In the above, we first match `(,x ,y ,z) against '(1 2 3) and then match (and sum (guard (< 2 sum))) against the result of (yant/list-sum '(1 2 3)) Also, `pcase' performs some compiler-like optimizations on the provided patterns. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at