purplex 0.1.3

# purplex [![Build Status][build-status-badge]] [build-status] [![Coverage Status][coverage-status-badge]] [coverage-status] [![PyPi version][pypi-version-badge]] [pypi-version] [![PyPi downloads][pypi-downloads-badge]] [pypi-downloads] A set of wrappers and other tools that make it easier to work with PLY. * **Lexer**: a pure-python lexer that can be used as a drop-in replacement with PLY. * **Parser**: a wrapper around PLY's yacc parser that provides a more pythonic interface. ## Requirements * Python 3.2+ * requirements.txt ## Testing `python setup.py test` ## Example: Simple Expression Evaluator ```python from purplex import Lexer, TokenDef from purplex import Parser, attach class MyLexer(Lexer): INTEGER = TokenDef(r'\d+') LPAREN = TokenDef(r'\(') RPAREN = TokenDef(r'\)') TIMES = TokenDef(r'\*') DIVIDE = TokenDef(r'/') PLUS = TokenDef(r'\+') MINUS = TokenDef(r'-') WHITESPACE = TokenDef(r'[\s\n]+', ignore=True) class MyParser(Parser): LEXER = MyLexer PRECEDENCE = ( ('left', 'PLUS', 'MINUS'), ('left', 'TIMES', 'DIVIDE'), ) @attach('e : LPAREN e RPAREN') def brackets(self, lparen, expr, rparen): return expr @attach('e : e PLUS e') def addition(self, left, op, right): return left + right @attach('e : e MINUS e') def subtract(self, left, op, right): return left - right @attach('e : e TIMES e') def multiply(self, left, op, right): return left * right @attach('e : e DIVIDE e') def division(self, left, op, right): return left / right @attach('e : INTEGER') def number(self, num): return int(num) if __name__ == '__main__': parser = MyParser() # Should return 10 if precedence is working print(parser.parse('2 + 3 * 4 - 4')) ``` ```bash $ python example.py 10 ``` [build-status]: https://travis-ci.org/mtomwing/purplex "Build status" [build-status-badge]: https://travis-ci.org/mtomwing/purplex.png?branch=master [coverage-status]: https://coveralls.io/r/mtomwing/purplex "Test coverage" [coverage-status-badge]: https://coveralls.io/repos/mtomwing/purplex/badge.png?branch=master [pypi-version]: https://crate.io/packages/purplex "Latest version hosted on PyPi" [pypi-version-badge]: https://pypip.in/v/purplex/badge.png [pypi-downloads]: https://crate.io/packages/purplex "Number of downloads from PyPi" [pypi-downloads-badge]: https://pypip.in/d/purplex/badge.png

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