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        "description": "# grammpy\n\nCurrent version: 2.0.0\n\n[![Build Status](https://travis-ci.org/PatrikValkovic/grammpy.svg?branch=master)](https://travis-ci.org/PatrikValkovic/grammpy)\n[![Coverage Status](https://coveralls.io/repos/github/PatrikValkovic/grammpy/badge.svg?branch=master)](https://coveralls.io/github/PatrikValkovic/grammpy?branch=master)\n\nPackage for representing formal grammars.\nContains algorithms to work with a grammars and parse them.\n\n## Installation\n\nIf you are using `pip`, simple run following command.\n```\npip install grammpy\n```\n\nYou can install the package from the repository as well.\n```\ngit clone https://github.com/PatrikValkovic/grammpy.git\ncd grammpy\npython setup.py install\n```\n\n## Usage\n\nDefining a grammar doesn't require special tools anymore.\nAll what you need is just a IDE and you have the full support.\n\nLet's define grammar using standard Python objects instead.\n\n```python\nfrom grammpy import *\nfrom grammpy.transforms import ContextFree, InverseContextFree\nfrom grammpy.parsers import cyk\n\n\nclass Number:\n    def __init__(self, value):\n        self.value = value\n    def __hash__(self):\n        return hash(Number)\n\n\nclass PlusNonterminal(Nonterminal):\n    @property\n    def value(self):\n        return self.to_rule.get_value()\n\n\nclass PlusRule(Rule):\n    rule = ([PlusNonterminal], [PlusNonterminal, '+', PlusNonterminal])\n    def get_value(self):\n        child1 = self.to_symbols[0]\n        child2 = self.to_symbols[2]\n        return child1.value + child2.value\n\n\nclass RewriteRule(Rule):\n    fromSymbol = PlusNonterminal\n    toSymbol = Number\n    def get_value(self):\n        return self.to_symbols[0].s.value\n\n\ng = Grammar(terminals=[Number, '+'],\n            nonterminals=[PlusNonterminal],\n            rules=[PlusRule, RewriteRule],\n            start_symbol=PlusNonterminal)\nContextFree.prepare_for_cyk(g, inplace=True)\nroot = cyk(g, [Number(5), '+', Number(3), '+' , Number(8)])\nroot = InverseContextFree.reverse_cyk_transforms(root)\nassert root.value == 16\n```\n\n## Documentation\n\nYou can read more about the library in the [doc](doc) directory.\n\n## Examples\n\nYou can view some examples in the [examples](examples) directory.\n\n-----\n\nVersion: 2.0.0\n\nAuthor: Patrik Valkovi\u010d\n\nLicence: MIT",
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