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71 lines
1.9 KiB
71 lines
1.9 KiB
4 months ago
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import antlr3
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import testbase
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import unittest
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class t004lexer(testbase.ANTLRTest):
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def setUp(self):
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self.compileGrammar()
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def lexerClass(self, base):
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class TLexer(base):
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def emitErrorMessage(self, msg):
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# report errors to /dev/null
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pass
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def reportError(self, re):
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# no error recovery yet, just crash!
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raise re
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return TLexer
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def testValid(self):
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stream = antlr3.StringStream('ffofoofooo')
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lexer = self.getLexer(stream)
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token = lexer.nextToken()
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self.assertEqual(token.type, self.lexerModule.FOO)
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self.assertEqual(token.start, 0)
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self.assertEqual(token.stop, 0)
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self.assertEqual(token.text, 'f')
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token = lexer.nextToken()
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self.assertEqual(token.type, self.lexerModule.FOO)
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self.assertEqual(token.start, 1)
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self.assertEqual(token.stop, 2)
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self.assertEqual(token.text, 'fo')
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token = lexer.nextToken()
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self.assertEqual(token.type, self.lexerModule.FOO)
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self.assertEqual(token.start, 3)
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self.assertEqual(token.stop, 5)
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self.assertEqual(token.text, 'foo')
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token = lexer.nextToken()
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self.assertEqual(token.type, self.lexerModule.FOO)
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self.assertEqual(token.start, 6)
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self.assertEqual(token.stop, 9)
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self.assertEqual(token.text, 'fooo')
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token = lexer.nextToken()
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self.assertEqual(token.type, self.lexerModule.EOF)
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def testMalformedInput(self):
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stream = antlr3.StringStream('2')
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lexer = self.getLexer(stream)
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try:
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token = lexer.nextToken()
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self.fail()
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except antlr3.MismatchedTokenException as exc:
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self.assertEqual(exc.expecting, 'f')
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self.assertEqual(exc.unexpectedType, '2')
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if __name__ == '__main__':
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unittest.main()
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