[squeak-dev] using O-Meta for parsing, etc., this UDP packet template?

Lawson English lenglish5 at cox.net
Wed Nov 17 13:44:35 UTC 2010

That's along the lines of what I think I want to do, but I'm not sure 
how to get started. I've never had a formal class in parsing/scanning in 
the first place.

On 11/16/10 10:44 PM, Hans-Martin Mosner wrote:
> Am 16.11.2010 20:43, schrieb Lawson English:
>> I've had the Squeak-based SL client project on hold for a while due to
>> networking issues, but the most recent versions of various libraries
>> seem to work fine with the Second Life server, so I'd like to start
>> that up again.
>> My current issue concerns handling the 500+ UDP packets that define a
>> huge part of the Second Life client-server protocols:
>> http://lib.openmetaverse.org/template/release/
>> http://wiki.secondlife.com/wiki/Template_verifier.py
>> There are 3 interrelated tasks: parsing the template, parsing data
>> from incoming packets and creating data for outgoing packets. Jecel
>> suggested I look into O-Meta for this purpose, but I have not a clue
>> how to get started.
> I'd guess that OMeta would be very useful for parsing the templates, but
> probably not speedy enough for the UDP packets for real-time use due to
> its backtracking mechanism.
> One possible approach is to use an OMeta grammar to generate fast packet
> parsing code from the templates. This is what I would try.
> Another would be to implement a simpler #apply: method that is suitable
> for packet parsing, and generate OMeta productions from the templates.
> Cheers,
> Hans-Martin

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