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([129.127.15.244]) by mx.google.com with ESMTPS id n6sm293329wag.39.2009.08.06.01.08.14 (version=TLSv1/SSLv3 cipher=RC4-MD5); Thu, 06 Aug 2009 01:08:15 -0700 (PDT) Content-Type: multipart/signed; boundary=Apple-Mail-2-655950811; micalg=sha1; protocol="application/pkcs7-signature" Mime-Version: 1.0 (Apple Message framework v935.3) References: <4A7921CF.5020803@morningstar2.co.uk> <79B867F8-66E2-4E32-BF89-8967B4F58BA3@gmail.com> <4A7A6FE5.6030808@morningstar2.co.uk> X-Mailer: Apple Mail (2.935.3) X-Spam-Whitelist: Message-ID: Date: Thu, 6 Aug 2009 17:38:10 +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: <4A7A6FE5.6030808@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: 06 Aug 2009 08:18:29.0179 (UTC) FILETIME=[7A8D88B0:01CA166E] Status: R X-Status: X-Keywords: X-UID: 5828 --Apple-Mail-2-655950811 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Hi Joseph, Regarding space-skipping: On 06/08/2009, at 3:23 PM, Joseph Wright wrote: >> Re-reading your approach in xparse-alt, I believe what is currently >> implemented there is the best approach. It applies sensible >> defaults and >> allows overrides; to whit: >> >> {m o} does not skip spaces >> {m o m} does skip spaces >> {m !o} does skip spaces >> {m ^o m} does not skip spaces >> >> Since (a) can't always skip spaces, and (b) never skipping spaces >> leads >> to inconsistencies, and (c) only need to ignore spaces when the >> optional >> argument is last -- I strongly think xparse-alt has it right. > > My main concern is "should we provide the option to change things"? > Would it be clearer if the same rules always apply (is there a need to > skip spaces to find trailing optional arguments, for example). I would support dropping ^ and ! in xparse-alt providing that final optional arguments don't skip spaces. 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