From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-users-return-21022-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 21659 invoked by alias); 30 Nov 2015 16:50:26 -0000
Mailing-List: contact zsh-users-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Users List <zsh-users.zsh.org>
List-Post: <mailto:zsh-users@zsh.org>
List-Help: <mailto:zsh-users-help@zsh.org>
X-Seq: 21022
Received: (qmail 7738 invoked from network); 30 Nov 2015 16:50:25 -0000
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.0
X-Authority-Analysis: v=2.1 cv=X+5rdgje c=1 sm=1 tr=0
 a=Uh/wpEIUX9UX0FOdpsyW1Q==:117 a=Uh/wpEIUX9UX0FOdpsyW1Q==:17 a=N659UExz7-8A:10
 a=TrbaS1tsfxxtrkP7MRwA:9 a=pILNOxqGKmIA:10
Message-id: <565C7E4E.6050603@eastlink.ca>
Date: Mon, 30 Nov 2015 08:50:22 -0800
From: Ray Andrews <rayandrews@eastlink.ca>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Icedove/31.7.0
MIME-version: 1.0
To: zsh-users@zsh.org
Subject: Re: lexing
References: <565B18C6.6090707@eastlink.ca>
 <151129100735.ZM24525@torch.brasslantern.com> <565BB016.6020905@eastlink.ca>
 <20151130033348.GJ2504@tarsus.local2> <565BCE96.4070406@eastlink.ca>
 <565BD4C5.1070608@eastlink.ca> <151130082354.ZM28358@torch.brasslantern.com>
In-reply-to: <151130082354.ZM28358@torch.brasslantern.com>
Content-type: text/plain; charset=windows-1252; format=flowed
Content-transfer-encoding: 7bit

On 11/30/2015 08:23 AM, Bart Schaefer wrote:
> On Nov 29,  8:47pm, Ray Andrews wrote:
> }
> }     $(( ##\e )) is 27,
> }     (( #VAR ))
> }     $(( #var ))
> }
> } ... but, given that there is preceding whitespace, would these three not
> } break Bart's rule? Perhaps the whitespace here is does not qualify as
> } 'word separating'?  Or is the " $(()) " construct an exception?
>
> The whitespace is not "word separating" because (( stuff )) is shorthand
> for
>      let "stuff"
> so the spaces are quoted, at the level at which comments apply.  $(( ))
> is just a way to substitute inline the "let".
>
I thought of that construction as 'math'.  But ... well nuts, so it is, 
and so is 'let' but with the implied quotation. So visually it's a 
gotcha, but not a very deep gotcha.  So it's an exception but it should 
be simple enough to lex. Mysteries evaporate when one sees what's under 
the hood.