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Re: [css-syntax][selectors] Added a COLUMN token to Syntax

From: Simon Sapin <simon.sapin@exyr.org>
Date: Thu, 04 Apr 2013 12:13:02 +0200
Message-ID: <515D522E.5040208@exyr.org>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: www-style list <www-style@w3.org>
Le 04/04/2013 02:06, Tab Atkins Jr. a écrit :
> I just added a COLUMN token to the Syntax draft, matching "||".  It's
> needed for Selectors, so it can maintain LL(1).  (Otherwise, seeing
> "*" followed by "|" is ambiguous until you look at the *next* token.)


I’m not objecting, but shouldn’t LL(1) be only an implementation 
concern? AFAICT, it is not detectable whether an implementation parses 
"||" as a single token, or looks ahead for two delim tokens.

Can something undetectable make an implementation non-conforming?

Simon Sapin
Received on Thursday, 4 April 2013 10:13:30 UTC

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