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 15:35:24 +0000 Message-ID: <87r0iryh1f.fsf@localhost> References: <87frzuae9n.fsf@posteo.net> <871qbatqc8.fsf@posteo.net> <87wmsz7lzn.fsf@posteo.net> <87edf1m7lq.fsf@localhost> <87frze76wc.fsf@localhost> <87y1d2vc49.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="12526"; 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 16:33:28 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 1rMrd1-00030o-GB for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Jan 2024 16:33:27 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rMrbz-0002kh-86; Mon, 08 Jan 2024 10:32:23 -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 1rMrbt-0002k2-Ux for emacs-devel@gnu.org; Mon, 08 Jan 2024 10:32:19 -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 1rMrbr-0003V0-Az for emacs-devel@gnu.org; Mon, 08 Jan 2024 10:32:17 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 8307A240028 for ; Mon, 8 Jan 2024 16:32:12 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1704727932; bh=jnk18/IuioKrkh/jGpqXMuHKursYHa87SyGYdZ2pwSY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=C02mJxY/QjhNfLI81THq3HGmCUXnz4lEoGo0sDygCU55SwbLEa55hlmGezeyPqwDA /7LFw8sIqhiGp/ExfFvibH3L11oQlKWsgF9Gn3oZclfxuMdXZvsRTH/sY7Hu5V/Pw7 u4U69ww2Ngg9R9ni8BEIxrDq/PnT3d5urLbOgeNl/mv2FioaK3wwy44mM+Kqn/YSpL q7xlhh0t6wgWvCS/bTcujPMRmWnhfJsq0wba87ys+JY3T6JMyXnneE6gZ9kChknUNj DIlbkizJb6vZG7vhrX3FjgmWUsdpbdE6LLuxnnOZOdEYcMDolsIP0AUTIvL12Dg12U 260msMYOqcSlw== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4T7yjR5rJnz6tvr; Mon, 8 Jan 2024 16:32:11 +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:314750 Archived-At: Richard Stallman writes: > > > Since the idea is pattern-matching, I think that a regexp is natural > > > as well as more general. Why not do this? > > > It is not very clear then how to match plain strings for equality. > > 1. Instead of writing the string as a literal, write a regexp to match > only that string. This is not hard. This is a bad idea when writing _generic purpose_ code - regexp matching is _a lot_ slower compared to string comparison. Orders of magnitude. > 2. Use this constrained variable patern: > > (equal foo "xyz") > > It will bind the variable `foo', but you are not required to use it. I am not a big fan of introducing yet another convention: Compare (cond* ((match* `("foo?" "bar") '("fo" "bar")) t)) ; => t (pcase '("fo" "bar") (`("foo?" "bar") t)) ; => nil People familiar with `pcase' will have to keep the above distinction in mind all the time - a source of potential confusion. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at