[pypy-dev] Parser

Alexander Kellett pypy at lypanov.net
Thu Mar 31 11:40:20 CEST 2005

sidenote: pyggy is looking pretty good for my usage in rubydium :)
interested to see logilab's work :)

On Mar 31, 2005, at 10:18 AM, Armin Rigo wrote:
> Hi all,
> Last sprint, one of the things we integrated into PyPy was Jon's 
> parser.
> There was some potential collision here: the Logilab people, Ludovic in
> particular, has also been working on a parser for some time.  
> Unfortunately,
> the sprint started on a Saturday and the integration was mostly done by
> Monday, so contacting Ludovic for feed-back was difficult.
> After a chat with Adrien, the situation seems to be as follows: the 
> Logilab
> parser is roughly ready (needs polishing) and will be checked in 
> somewhere
> soon.  (Checking in regularly would be a good idea anyway, even for 
> incomplete
> stuff...)  It ressembles Jon's in that it parses Python's Grammar file 
> and
> makes a parser from that, producing nested tuples in the format that 
> the
> compiler package can turn into AST and then bytecode.  We will have to 
> compare
> the two parsers to know more precisely the current status.  I suspect 
> that the
> Logilab parser is more appropriate to Logilab's and DFKI's own goals 
> in the
> WP09/WP10, which involve playing around with the syntax, using a 
> visitor
> pattern to generate its output; as far as I understand it, Jon's 
> parser is not
> meant to be nice and flexible but mainly just a rewrite in Python of 
> CPython's
> own parser.
> This is a bit unfortunate, as it means that some work has been done 
> twice.
> Not having a Logilab person at the PyCon sprint was certainly a 
> problem, given
> that they should take the lead on the parsing and compiling stages 
> (which, I
> admit freely, I'm not too interested in).
> I'll let Adrien and Ludovic comment on this...
> A bientôt,
> Armin
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