xref: /aosp_15_r20/external/antlr/runtime/Python3/unittests/testrecognizers.py (revision 16467b971bd3e2009fad32dd79016f2c7e421deb)

import sys
import unittest

import antlr3


class TestBaseRecognizer(unittest.TestCase):
    """Tests for BaseRecognizer class"""

    def testGetRuleInvocationStack(self):
        """BaseRecognizer._getRuleInvocationStack()"""

        rules = antlr3.BaseRecognizer._getRuleInvocationStack(__name__)
        self.assertEqual(
            rules,
            ['testGetRuleInvocationStack']
            )


class TestTokenSource(unittest.TestCase):
    """Testcase to the antlr3.TokenSource class"""


    def testIteratorInterface(self):
        """TokenSource.next()"""

        class TrivialToken(object):
            def __init__(self, type):
                self.type = type

        class TestSource(antlr3.TokenSource):
            def __init__(self):
                self.tokens = [
                    TrivialToken(1),
                    TrivialToken(2),
                    TrivialToken(3),
                    TrivialToken(4),
                    TrivialToken(antlr3.EOF),
                    ]

            def nextToken(self):
                return self.tokens.pop(0)


        src = TestSource()
        tokens = []
        for token in src:
            tokens.append(token.type)

        self.assertEqual(tokens, [1, 2, 3, 4])



class TestLexer(unittest.TestCase):

    def testInit(self):
        """Lexer.__init__()"""

        class TLexer(antlr3.Lexer):
            api_version = 'HEAD'

        stream = antlr3.StringStream('foo')
        TLexer(stream)


if __name__ == "__main__":
    unittest.main(testRunner=unittest.TextTestRunner(verbosity=2))