test_parse_pgen.py

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import unittest

import jsparagus.gen

from jsparagus import parse_pgen, parse_pgen_generated

class ParsePgenTestCase(unittest.TestCase):

    def test_self(self):

        import os

        filename = os.path.join(os.path.dirname(parse_pgen.__file__), "..",

                                "pgen.pgen")

        grammar = parse_pgen.load_grammar(filename)

        self.maxDiff = None

        pgen_grammar = parse_pgen.pgen_grammar

        self.assertEqual(pgen_grammar.nonterminals, grammar.nonterminals)

        self.assertEqual(pgen_grammar.variable_terminals,

                         grammar.variable_terminals)

        self.assertEqual(pgen_grammar.goals(), grammar.goals())

        with open(parse_pgen_generated.__file__) as f:

            pre_generated = f.read()

        import io

        out = io.StringIO()

        jsparagus.gen.generate_parser(out, grammar)

        generated_from_file = out.getvalue()

        self.maxDiff = None

        self.assertEqual(pre_generated, generated_from_file)

if __name__ == '__main__':

    unittest.main()