Language Size (was Re: [TLUG]: ECMAScript ("Javascript") Version 4 - FALSE ALARM)

[Jeff Dyer]

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
>> much?
>> 
>> 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
>> properties.
>> 
>> 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:
> 
>   http://ecmascript.org/es4/spec/grammar.pdf
> 
> 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.
> 
> Jd
> 
>> Regards,
>> Maciej
>> 
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> 
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