TATSU (the successor to Grako) is a tool that takes grammars in a variation
of EBNF as input, and outputs memoizing (Packrat) PEG parsers in Python.
Tatsu can compile a grammar stored in a string into a
tatsu.grammars.Grammar object that can be used to parse any given input,
much like the re module does with regular expressions, or it can generate a
Python module that implements the parser.
https://pypi.python.org/pypi/tatsu/
https://github.com/apalala/tatsu
http://tatsu.readthedocs.io/
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