[ragel-users] JavaScript code generation for Ragel

[Dominic Marks]

  Hey Adrian,

I haven't but I will do. Thank you.

I'm not sure if the RubyCodeGen::writeInit function is incorrect but 
it's quite divergent from the CDCodeGen version. The only problem I had 
doing the work, besides a few missed semicolons, was that the write init 
directive was trying to initialise pe to the data length. In my testing 
script the initialisation and execution stages are in separate functions 
and this produced invalid JavaScript (data being undefined at that point).

I assumed I had misunderstood something about the options that can be 
given to write init and write exec but after that turned up a blank I 
looked at CDCodeGen. I was surprised to find that it didn't include 
similar code relating to the end directive. I made my writeInit function 
more like CDCodeGen and my problem was resolved.

The code in question:

http://github.com/dominicmarks/ragel-js/commit/7a8e554f2829fbebe04a26837ebb5512314c376b#diff-0

The difference might be related to the concessions you mention, I didn't 
look into it too much.

Thanks for Ragel, it's a great piece of software!

Dominic

On 11/10/2010 19:54, Adrian Thurston wrote:
> Great, thanks for working on this!
>
> Did you have a look at the java code generator? There were a few 
> concessions that had to be made in the Ruby code generator that might 
> not need to be made in JS.
>
> -Adrian
>
> On 10-10-11 04:07 AM, Dominic Marks wrote:
>> Hi all,
>>
>> I've got the table code generation strategy working. I'm going to work
>> on building a set of RL files for testing purposes and then have a crack
>> at writing a code generation backend that targets modern JavaScript VMs
>> (e.g. produces JavaScript that best suits a JIT/tracer). If anyone would
>> like to help with any part of this process, I'd be most grateful.
>>
>> I've forked Ragel trunk into a github repo while I work on this. There
>> is a sample script (I translated the maillbox.rl file from the Ragel
>> distribution) which you can play with if you install Node.js (a
>> JavaScript application framework powered by Google's V8 VM). Note that
>> while the sample script uses Node.js for IO, but the code generated is
>> plain JavaScript. I look forward to being able to use Ragel in the
>> browser soon too.
>>
>> Github:
>>
>> http://github.com/dominicmarks/ragel-js
>>
>> A diff against Ragel trunk is here:
>>
>> http://goodforbusiness.co.uk/~dom/ragel-js-20101011.diff
>> <http://goodforbusiness.co.uk/%7Edom/ragel-js-20101011.diff>
>>
>> The code is mostly a cut-paste-and-replace from Ruby at the moment. I'll
>> be tidying it up over the next few weeks, as my time allows. However, it
>> does at least run one Ragel state machine correctly already.
>>
>> Mailbox.rl/Mailbox.js:
>>
>> http://goodforbusiness.co.uk/~dom/mailbox.js
>> <http://goodforbusiness.co.uk/%7Edom/mailbox.js> (Requires Node.js).
>>
>> Cheers,
>> Dom
>>
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