竣 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.

竣 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.

竣 TatSu fully supports left-recursive rules in PEG grammars using the algorithm by Laurent and Mens. The generated AST has the expected left associativity.

https://github.com/neogeny/TatSu http://tatsu.readthedocs.io/en/stable/

v4.2.5 --------

* #42 https://github.com/neogeny/TatSu/issues/42 Rename vim files from grako.vim to tatsu.vim (@fcoelho https://github.com/fcoelho) * #51 https://github.com/neogeny/TatSu/issues/51 Fix inconsistent code generation for whitespace (@fpom https://github.com/fpom) * #54 https://github.com/neogeny/TatSu/pull/54 Only care about case of first letter of rule name for determining advance over whitespace (@acw1251 https://github.com/acw1251)

v4.2.4 --------- * #40 Make the start rule default to the first rule defined in the grammar (@hariedo) * #43 Import re from tatsu.util to support optional regex-only features (@azazel75) * #47 Fix incorrect sample code in documentation

v4.2.3 --------

* #37 Regression: The #include pragma works by using the EBNFBuffer from grammars.py. Somehow the default EBNFBootstrapBuffer from bootstrap.py has been used instead (@gegenschall). * #38 Documentation: Use of json.dumps() requires ast.asjson() (@davidchen).

-- Juancarlo *Aıez*