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: Mon, 01 Jan 2024 14:33:11 +0000 Message-ID: <87h6jxm8d4.fsf@localhost> References: <878r5inysw.fsf@localhost> <878r5ewk81.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="40031"; 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 01 15:31:15 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 1rKJJy-000ACV-LY for ged-emacs-devel@m.gmane-mx.org; Mon, 01 Jan 2024 15:31:14 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rKJJ0-0007AS-07; Mon, 01 Jan 2024 09:30:14 -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 1rKJIu-0007AC-GB for emacs-devel@gnu.org; Mon, 01 Jan 2024 09:30:08 -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 1rKJIs-0008KF-8W for emacs-devel@gnu.org; Mon, 01 Jan 2024 09:30:08 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 2EEAC240027 for ; Mon, 1 Jan 2024 15:30:00 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1704119400; bh=gpFHflhLjUqtK6td3wzj2kH6JvlHFBdg96hOd5Njv5U=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=j7HtCAd++vhT/KqUMDUvYkSv8Hwwr8oXDXciPZodz+ixTCrrqzExGC0cdyTTBeKfY zAIysiXKwNe1pEQjhG1sMEGeP2jX5CmsPk7aYO3dybjf2CBVf2dfYDi6H2MQ6tNxk2 I3kmIvVDQ7ISguD9eSN5zX0DbZae0Hss9gCLnGB43rnyiD5z3iQcx8k9JpEpV4t1Sn u0aADgUtqmQtuhJEVfxRcFyhF1d+2bo6si97YA69aABKyhAm9EwII+wnVGffntiXSZ 0NlMmJjeuKzfD1w6Nvm5hcqsvtmBsUQrEFmgyn1cbEDOrwzRsvA+zPVHoBfsbw6YH6 bksxkWGV+SOfA== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4T3dfv3sWLz6tsb; Mon, 1 Jan 2024 15:29:59 +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:314418 Archived-At: Richard Stallman writes: > For tests which don't fit that form, you can use `constrain'. > Here's a valid example: > > `(,(integerp smaller) > ,(constrain bigger (> (= (mod (- (integerp bigger) dec) 5) 0) smaller))) > > Does the text I sent fail to make this clear? Would you please take > a look, and if it is not clear, tell me why? Your description is clear. However, it is somewhat similar to the existing `pcase' description in a way that it is also clear, but goes in odds with the usual Elisp structures - I see nested "constrained variable" construct yet as another DSL. I see myself coming to back the documentation of `cond*' again and again, just as I do with `pcase' now. Let me try to illustrate the problem with another example: ;; ALIST-VAL = '((:key1 . 1) (:key4 . 2)) ;; Match alist key where the key is one of a know set of keys. (match* (memq (alist-get key alist-val) '(:key1 :key2 :key3)) :key1) >From the description of "constrained variable" construct, the above will (1) test if ALIST-VAL contains a record with KEY=:key1 key; (2) test if KEY=:key1 is one of :key1 :key2 :key3. However, the above is also deceivingly similar to Elisp expression that tests the return value of `alist-get': (memq 1 '(:key1 :key2 :key3)) -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at