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: pcase bindings in patterns with complicated logic Date: Sun, 14 Jan 2024 16:21:44 +0000 Message-ID: <871qajsx5z.fsf@localhost> References: <87il3xt38w.fsf@localhost> <875xzwjta2.fsf@posteo.net> <878r4rsyyt.fsf@localhost> <87r0ijj48v.fsf@posteo.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21905"; mail-complaints-to="usenet@ciao.gmane.io" Cc: rms@gnu.org, emacs-devel@gnu.org To: Thierry Volpiatto Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Jan 14 17:19:36 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 1rP3Cx-0005T2-SE for ged-emacs-devel@m.gmane-mx.org; Sun, 14 Jan 2024 17:19:35 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rP3C5-0000l7-5W; Sun, 14 Jan 2024 11:18:41 -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 1rP3C2-0000ku-IX for emacs-devel@gnu.org; Sun, 14 Jan 2024 11:18:39 -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 1rP3C0-0003kr-Aq for emacs-devel@gnu.org; Sun, 14 Jan 2024 11:18:38 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 574FC240027 for ; Sun, 14 Jan 2024 17:18:33 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1705249113; bh=jhcRQmEoMPP9+sobXY+dGDEJoBIuORi4qOVWHvFoK/Q=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version: Content-Transfer-Encoding:From; b=V26hORvjio3VBeyUQOkJsBUxzEhDcdddBIwQT7oH1OhPZEDgjNa23VtvrN1xdeR9J 8Vjwrv0cgQPRlwLkGvTeURrEuX3bD53rWIxDzk2EgkbNqX2m/fcUlZFkG1dquTP31O VAzRpr3kdhxZ0sR7mIuZaswH+S1KQgPRwS9IA6Ex/Ac0lzAFpBQsJcc4MhwrdXswN/ UztwlU5xg9B/G7irG8BiR6/MdJvAbzcUW4PLr4yUgSTE5xwrjbSGByuegRVyxH3wIH bDOA44tN03ij8G5HQ47HNoipRn8B+2ikW10bu8myRXDPwZ7YYDCehEseGfQ0o6dZoW RG5+YZ5o89TkQ== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4TCgS82MDGz6tx0; Sun, 14 Jan 2024 17:18:32 +0100 (CET) In-Reply-To: <87r0ijj48v.fsf@posteo.net> 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:314968 Archived-At: Thierry Volpiatto writes: >>> [ BTW I don't understand why `app` pattern exists as long as now `pred`= is >>> supporting an extra arg ] >> >> Isn't it explained right in the manual? >> >> =E2=80=98(app FUNCTION PATTERN)=E2=80=99 >> Matches if FUNCTION called on EXPVAL returns a value that matches >> PATTERN. FUNCTION can take one of the forms described for =E2=80= =98pred=E2=80=99, >> above. Unlike =E2=80=98pred=E2=80=99, however, =E2=80=98app=E2=80= =99 tests the result against >> PATTERN, rather than against a boolean truth value. > > Perhaps it is right but I don't understand it, an example in the manual > would be welcome (if there is one I missed it). Does this example help? (pcase '(1 2 3) ((app cdr `(2 ,c)) (format "Match: %S" c))) You cannot easily do the same with pred. --=20 Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at