From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6718 invoked by alias); 3 Jan 2013 22:28:57 -0000 Mailing-List: contact zsh-users-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Users List List-Post: List-Help: X-Seq: 17533 Received: (qmail 254 invoked from network); 3 Jan 2013 22:28:55 -0000 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.2 Received-SPF: none (ns1.primenet.com.au: domain at linux.vnet.ibm.com does not designate permitted sender hosts) Date: Fri, 4 Jan 2013 06:18:32 +0800 From: Han Pingtian To: zsh-users@zsh.org Subject: Re: PATCH and more remarks on parameter expansion docs Message-ID: <20130103221832.GH2054@localhost.localdomain> References: <121230112044.ZM879@torch.brasslantern.com> <20121231233002.GC2054@localhost.localdomain> <130101211501.ZM3814@torch.brasslantern.com> <20130102083224.GF2054@localhost.localdomain> <130102084644.ZM4876@torch.brasslantern.com> <20130102232813.GG2054@localhost.localdomain> <130103114217.ZM6362@torch.brasslantern.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <130103114217.ZM6362@torch.brasslantern.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13010322-9360-0000-0000-00000EBB304A On Thu, Jan 03, 2013 at 11:42:17AM -0800, Bart Schaefer wrote: > On Jan 3, 7:28am, Han Pingtian wrote: > } Subject: Re: PATCH and more remarks on parameter expansion docs > } > } On Wed, Jan 02, 2013 at 08:46:44AM -0800, Bart Schaefer wrote: > } > > } > Note that splitting is applied to WORD in the assignment forms of > } > SPEC _before_ the assignment to NAME is performed. This affects > } > the result of array assignments with the A flag. > } > } I think it doesn't say this splitting _before_ assignments is only true > } when (A) is used. Looks like if (A) wasn't used, splitting will _after_ > } the assignments > > Ah, I see. OK, I agree that it's imprecise about this. It's imprecise > but not in the way that you think: The splitting is in fact done before > the assignment in either case, but at that point the internals have both > the expanded string and the split result available. The (A) flag then > determines which of those two values is used in the assignment. > > I'm not sure whether in practice this can ever have a visible effect. In > theory if there were some oddity with the syntax of WORD that caused the > splitting step to fail, then the NAME parameter would not be assigned, > but I can't trivially produce an example. > > On the other hand, when does this "mistake" in the documentation matter? > Given what it says, what did you expect ${=xx::=foo bar} to assign? > Since ${=xx::=foo bar} would result in two items foo and bar, but xx's value is "foo bar", so it looks like xx is assigned value "foo bar", then xx's value is splitted. But xx is a scalar here, so we cannot assign two value foo and bar to it at the same time. So I think the value would be joined again before the assignment? So I expect xx's value would be "foo bar"? Thanks.