Received: from mail.proteosys.com ([213.139.130.197]) by nummer-3.proteosys with Microsoft SMTPSVC(6.0.3790.3959); Mon, 10 Aug 2009 10:33:12 +0200 Received: by mail.proteosys.com (8.14.3/8.14.3) with ESMTP id n7A8X55j006736 for ; Mon, 10 Aug 2009 10:33:05 +0200 Received: from listserv.uni-heidelberg.de (listserv.uni-heidelberg.de [129.206.100.94]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id n7A8SVhS004646 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 10 Aug 2009 10:28:31 +0200 Received: from listserv.uni-heidelberg.de (localhost.localdomain [127.0.0.1]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id n79M1IKd014993; Mon, 10 Aug 2009 10:28:26 +0200 Received: by LISTSERV.UNI-HEIDELBERG.DE (LISTSERV-TCP/IP release 15.5) with spool id 293926 for LATEX-L@LISTSERV.UNI-HEIDELBERG.DE; Mon, 10 Aug 2009 10:28:26 +0200 Received: from relay2.uni-heidelberg.de (relay2.uni-heidelberg.de [129.206.210.211]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id n7A8SQ5M029241 for ; Mon, 10 Aug 2009 10:28:26 +0200 Received: from rv-out-0708.google.com (rv-out-0708.google.com [209.85.198.241]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id n7A8SLZk004500 for ; Mon, 10 Aug 2009 10:28:25 +0200 Received: by rv-out-0708.google.com with SMTP id c5so641221rvf.2 for ; Mon, 10 Aug 2009 01:28:21 -0700 (PDT) Received: by 10.140.161.2 with SMTP id j2mr1530804rve.123.1249892901249; Mon, 10 Aug 2009 01:28:21 -0700 (PDT) Received: from ?129.127.15.244? ([129.127.15.244]) by mx.google.com with ESMTPS id f42sm23247664rvb.55.2009.08.10.01.28.18 (version=TLSv1/SSLv3 cipher=RC4-MD5); Mon, 10 Aug 2009 01:28:19 -0700 (PDT) Content-Type: multipart/signed; boundary=Apple-Mail-3-1002755150; micalg=sha1; protocol="application/pkcs7-signature" Mime-Version: 1.0 (Apple Message framework v935.3) References: <4A7921CF.5020803@morningstar2.co.uk> <4A7A1505.4040604@residenset.net> <4A7A726F.3080006@morningstar2.co.uk> <4A7A857F.4010400@morningstar2.co.uk> <4A7E7B08.5090908@morningstar2.co.uk> X-Mailer: Apple Mail (2.935.3) X-Spam-Whitelist: Message-ID: <4C63330D-72F1-4669-BC32-43A4BAD7EEFF@gmail.com> Date: Mon, 10 Aug 2009 17:58:14 +0930 Reply-To: Mailing list for the LaTeX3 project Sender: Mailing list for the LaTeX3 project From: Will Robertson Subject: Re: xparse To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE In-Reply-To: <4A7E7B08.5090908@morningstar2.co.uk> Precedence: list List-Help: , List-Unsubscribe: List-Subscribe: List-Owner: List-Archive: X-ProteoSys-SPAM-Score: -6.599 () BAYES_00,RCVD_IN_DNSWL_MED X-Scanned-By: MIMEDefang 2.65 on 213.139.130.197 Return-Path: owner-latex-l@LISTSERV.UNI-HEIDELBERG.DE X-OriginalArrivalTime: 10 Aug 2009 08:33:12.0692 (UTC) FILETIME=[32D1EB40:01CA1995] Status: R X-Status: X-Keywords: X-UID: 5854 --Apple-Mail-3-1002755150 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit On 09/08/2009, at 5:00 PM, Joseph Wright wrote: > That leads to calls which look like: > > \DeclareDocumentCommand \foo { o m } > \DeclareDocumentCommand \foo { o +m } > \DeclareDocumentCommand \foo { O{default} m } > \DeclareDocumentCommand \foo { d() l m } > \DeclareDocumentCommand \foo { u{\bar} t+ +m } > \DeclareDocumentCommand \foo { s D<>{default} b o +m } > > This does not seem too bad to me: what do other people think? Comparing this back to the original xparse, the changes here are: - >{P} replaced by + - >{W} dropped, since it is applied automatically when necessary (final optional argument) - c dropped, replaced by 'd()' - d** and D**{} added - u* and U*{} added Personally, I still prefer the simpler 'o'/'o{}' syntax, but if we feel that the disambiguation of 'o'/'O{}' is more straightforward I'm happy with your proposal above. Regarding Lars' ideas in doc2l3, I do quite like the idea of his argument pre-processing stage. But let's discuss that afterwards. We can always add it with another letter! 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