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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assert token.type == self.lexerModule.FOO
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assert token.start == 0, token.start
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assert token.stop == 0, token.stop
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assert token.text == 'f', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.FOO
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assert token.start == 1, token.start
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assert token.stop == 2, token.stop
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assert token.text == 'fo', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.FOO
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assert token.start == 3, token.start
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assert token.stop == 5, token.stop
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assert token.text == 'foo', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.FOO
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assert token.start == 6, token.start
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assert token.stop == 9, token.stop
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assert token.text == 'fooo', token.text
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token = lexer.nextToken()
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assert 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, exc:
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self.failUnlessEqual(exc.expecting, 'f')
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self.failUnlessEqual(exc.unexpectedType, '2')
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if __name__ == '__main__':
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unittest.main()
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