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Re: [css3-syntax] universal version of the CSS2.1 error handling grammar (aka. core grammar)

From: Kang-Hao (Kenny) Lu <kennyluck@csail.mit.edu>
Date: Thu, 31 May 2012 09:44:27 +0800
Message-ID: <4FC6CCFB.7020605@csail.mit.edu>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: WWW Style <www-style@w3.org>
(12/05/31 9:16), Tab Atkins Jr. wrote:
> On Wed, May 30, 2012 at 6:03 PM, Kang-Hao (Kenny) Lu
> <kennyluck@csail.mit.edu> wrote:
>> While I was trying to understand if using <value> for CSS Varaibles
>> makes sense or not, I realized that the CSS2.1 core grammar can be
>> extended to an universal one, where universality of a grammar[1] means
>> that the grammar is capable of generating all possible sequences of tokens.
> Much less confusingly, the Syntax draft defines a universal grammar
> via its tokenizer already.  (This can be easily seen by the fact that
> every single state has an "anything else" transition rule.)

This isn't finished yet, no? Note that I still think a state machine
would be more readable, it's just that it is not hard to write down the
grammar this way (and well, I want to play with it via Bison :p).

This pretty much just what we should have done to resolve ISSUE 140
(what David said in [1]).

By the way, it's probability a lot time consuming to write the HTML
grammar in this way and also it isn't useful as the state machine is
much clearer.

[1] http://lists.w3.org/Archives/Public/www-style/2011Mar/0258

Received on Thursday, 31 May 2012 01:44:58 UTC

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