From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: Where the next effort in prolog will be and a cool match hack!! Date: Mon, 13 Sep 2010 14:20:56 +0200 Message-ID: <87hbht4yxj.fsf@gnu.org> References: <201009092315.02287.stefan.tampe@spray.se> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1284380482 11050 80.91.229.12 (13 Sep 2010 12:21:22 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 13 Sep 2010 12:21:22 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Mon Sep 13 14:21:18 2010 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Ov829-0007Cb-LD for guile-devel@m.gmane.org; Mon, 13 Sep 2010 14:21:17 +0200 Original-Received: from localhost ([127.0.0.1]:43604 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Ov829-0008P3-0w for guile-devel@m.gmane.org; Mon, 13 Sep 2010 08:21:17 -0400 Original-Received: from [140.186.70.92] (port=42212 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Ov824-0008NI-2k for guile-devel@gnu.org; Mon, 13 Sep 2010 08:21:13 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1Ov820-0001GV-0b for guile-devel@gnu.org; Mon, 13 Sep 2010 08:21:12 -0400 Original-Received: from lo.gmane.org ([80.91.229.12]:45335) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Ov81z-0001GD-RK for guile-devel@gnu.org; Mon, 13 Sep 2010 08:21:07 -0400 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1Ov81x-0007AN-D9 for guile-devel@gnu.org; Mon, 13 Sep 2010 14:21:05 +0200 Original-Received: from yoda.fdn.fr ([80.67.169.18]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 13 Sep 2010 14:21:05 +0200 Original-Received: from ludo by yoda.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 13 Sep 2010 14:21:05 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 30 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: yoda.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 27 Fructidor an 218 de la =?iso-8859-1?Q?R=E9volutio?= =?iso-8859-1?Q?n?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) Cancel-Lock: sha1:J6QCBW5wQeleiZqyfZwUcTt8O1E= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:10910 Archived-At: Hi, Alex Shinn writes: > The default matcher in Racket is extensible by dispatching > on the first symbol in each list, so a pair is (cons a b) and a > list would be (list a b c). This is slightly more verbose, and > looks like how you would generate the data rather than its > actual structure, but at least is extensible. That’s similar to what OCaml, Coq, Scala, & co. do. The nice thing is that it’s expressive and makes for an extensible matcher. > It would be possible to build on Wright's syntax with a > single hook, e.g. patterns of the form > > (extended-match match-dispatcher data ...) > > possibly abbreviated > > (: match-dispatcher data ...) > > where `match-dispatcher' is an extension macro following > some CPS API. A kludge, but perhaps better than > redefining a matcher for every extension. Sounds like a nice plan. :-) Thanks, Ludo’.