Re: [Pyparsing] Painfully slow parsing.

[Gre7g L. <haf...@ya...>]

Try:

import pyparsing as PP
PP.ParserElement.enablePackrat()


It's on the website somewhere, but not nearly prominent enough IMHO.

Gre7g




________________________________
From: John Krukoff <jkr...@lt...>
To: pyp...@li...
Sent: Friday, August 28, 2009 5:08:39 PM
Subject: [Pyparsing] Painfully slow parsing.

Hello,

I have a serious speed problem with a parser written using pyparsing,
where it's taking ~13 minutes to parse a 30 line file. I'm totally lost
on what might be causing it, as small variations seem to be causing
large differences in parsing time. I was hoping I could get some tips on
general optimization strategies to follow. For instance, I'm suspicious
that I should be trying harder to use the '-' operator, and wonder if
that would help...

I've posted my project on google code for easy access, the relevant bit
that defines the parsing grammar if I can interest someone in taking a
look, is at:
http://code.google.com/p/compactxml/source/browse/compactxml/expand.py

I'm making heavy use of significant whitespace and
pyparsing.indentedBlock, so it does feel like I'm fighting against
pyparsing a bit. Unfortunately, it looks like indentedBlock is
incompatible with packrat parsing, so the most obvious performance
improving tip looks to be unusable.

I'm also unsure if the mailing list is the best place to ask for help,
as it looks like there's more traffic on the pyparsing home page
discussion tab?
-- 
John Krukoff <jkr...@lt...>
Land Title Guarantee Company


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