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Correct info on parser

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rocky 2016-05-15 19:44:18 -04:00
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@ -109,15 +109,20 @@ Hartmut a decade an a half ago:
NB. This is not a masterpiece of software, but became more like a hack.
Probably a complete rewrite would be sensefull. hG/2000-12-27
This project deparses using a LR parse. However another approach is to
do something like simulate execution symbolically and build expression
trees off of stack results. The two important projects that work this
way are [unpyc3](https://code.google.com/p/unpyc3/) and most
especially [pycdc](https://github.com/zrax/pycdc) The latter project
is largely by Michael Hansen and Darryl Pogue. If they supported
getting source-code fragments and I could call it from Python, I'd
probably ditch this and use that. From what I've seen, the code runs
blindingly fast and spans all versions of Python.
This project deparses using a Early-algorithm parse with lots of
massaging of tokens and the grammar in the scanner
phase. Early-algorithm parsers are context free and tend to be linear
if the grammar is LR or left recursive.
Another approach that doesn't use grammars is to do something like
simulate execution symbolically and build expression trees off of
stack results. The two important projects that work this way are
[unpyc3](https://code.google.com/p/unpyc3/) and most especially
[pycdc](https://github.com/zrax/pycdc) The latter project is largely
by Michael Hansen and Darryl Pogue. If they supported getting
source-code fragments and I could call it from Python, I'd probably
ditch this and use that. From what I've seen, the code runs blindingly
fast and spans all versions of Python.
Tests for the project have been, or are being, culled from all of the
projects mentioned.