jodyer at adobe.com
Tue Oct 30 13:53:26 PDT 2007
Fixed url of grammar.
On 10/30/07 1:46 PM, Jeff Dyer wrote:
> On 10/30/07 1:23 PM, Maciej Stachowiak wrote:
>> On Oct 30, 2007, at 1:01 PM, Chris Pine wrote:
>>> Maciej Stachowiak wrote:
>>>> Can anyone address feasibility of a small full implementation
>>>> (source code all the way to execution)?
>>> If we didn't think it was feasible, we wouldn't be here. :) While
>>> we don't have a full implementation yet (no one does), progress is
>>> looking good. Our latest engine, just out in Opera 9.5 beta, is
>>> both smaller and considerably faster than our previous engine (which
>>> we've shipped on many small devices). It runs on devices smaller
>>> than an iPhone, no problem. (How much ram does an iPhone have? I
>>> don't see that on Apple's site.)
>> Does your latest shipping engine implement parts of ES4? If so, how
>> By the way, I think the discussions about language size could benefit
>> from some quantitative data. I think the following comparisons would
>> be interesting:
>> 1) Size of the ES4 grammar relative to the ES3 grammar (say, by count
>> of productions).
>> 2) Size of the ES4 standard library by count of classes, methods and
>> I am willing to run the number on these if someone can help me find
>> the grammar and some sort of standard library index in the spec.
> The grammar is posted at:
> The builtin's are described in the a draft library spec in the monotone
> repository (./spec/library.pdf), which you should have access to.
> Another interesting comparison is between ES3 and ES4 asts. There is a lot
> of syntactic sugar that get boiled out during parsing of ES4 programs. In
> fact, the same parse routines can be reused for different productions of the
> surface grammar. Compare the value syntax for objects and type syntax for
> record types, for example.
> I'm happy to help put either document in a format that is easier to analyze.
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