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/ -- Juancarlo