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: Instead of pcase Date: Thu, 28 Dec 2023 13:05:34 +0000 Message-ID: <878r5ewk81.fsf@localhost> References: <878r5inysw.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="4992"; 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 Thu Dec 28 14:03:33 2023 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 1rIq2u-00015r-JC for ged-emacs-devel@m.gmane-mx.org; Thu, 28 Dec 2023 14:03:32 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rIq1t-0002ew-CB; Thu, 28 Dec 2023 08:02:29 -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 1rIq1r-0002eh-GR for emacs-devel@gnu.org; Thu, 28 Dec 2023 08:02:27 -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 1rIq1p-0006CW-0F for emacs-devel@gnu.org; Thu, 28 Dec 2023 08:02:27 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id EAE75240027 for ; Thu, 28 Dec 2023 14:02:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1703768543; bh=vqVnImvreskoMNCNy8DGCllO/kW0gxCYE9IhUbEClsM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=H/YV4KEJD25n2O9HmGnIpbKBF8/nE4lSBlOrq/35xOl8Lo3pbQ8dA/wseykMtRogl xynqDvzinF6P6zCdXRoizJEMIKIQhYsghJU0hqkroqmwNBU24xSa8O5OnQpqsTpQv5 VZ+N8rgX4lm/tEdWnuzogzoxw2NyUvfwqycWj2JzOIwynGXBMJ3WWTSiP7pvWDZopb pGI1tEm5GxvYwSyB5GbUxbXZVzuv1QQO0Px2QMia7G3WuaG0DPa/n9deZrc8HxqO5G 3aDE8aldRN+GB5eMO9Lvt9snCttorlPGIQG6g10Hz5Q5t8ciPp6kU8lHb1zGRQ+I7o uBnTzItLsv5bg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4T17vf3sZxz9rxL; Thu, 28 Dec 2023 14:02:22 +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=ham 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:314274 Archived-At: Richard Stallman writes: > > > (> num-foos min-foos) ; Match any number greater than MIN-FOOS, > > > ; bind `num-foos' to it. > > > But this is confusing - which symbol to bind and which one to eval is > > based purely on position in the ,(PRED ...) pattern. > > As this states > > > Constrained variable: (PRED VARIABLE) or, more generally, > > (PRED VARIABLE OTHER-ARGS...) > > the pattern variable to bind is always the second element of that list > ... > Is it clear now what that pattern means? > Can you suggest what aspects of that (or other) text to improve? I did not mean that I do not understand the description of PRED form. I just find the syntax you proposed confusing - it is too similar to the ordinary Elisp forms. Especially when we start nesting "constrained variable" constructs. For example, consider matching a list of two integers where the second element is both larger than the first and also divisible by 5 when subtracted variable DEC: `(,(integerp smaller) ,(> (= (mod (- (integerp bigger) dec) 5) 0) smaller)) -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at