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79 lines
2.3 KiB
79 lines
2.3 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 t011lexer(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('foobar _Ab98 \n A12sdf')
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lexer = self.getLexer(stream)
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token = lexer.nextToken()
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assert token.type == self.lexerModule.IDENTIFIER
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assert token.start == 0, token.start
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assert token.stop == 5, token.stop
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assert token.text == 'foobar', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.WS
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assert token.start == 6, token.start
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assert token.stop == 6, token.stop
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assert token.text == ' ', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.IDENTIFIER
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assert token.start == 7, token.start
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assert token.stop == 11, token.stop
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assert token.text == '_Ab98', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.WS
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assert token.start == 12, token.start
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assert token.stop == 14, token.stop
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assert token.text == ' \n ', token.text
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token = lexer.nextToken()
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assert token.type == self.lexerModule.IDENTIFIER
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assert token.start == 15, token.start
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assert token.stop == 20, token.stop
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assert token.text == 'A12sdf', 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('a-b')
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lexer = self.getLexer(stream)
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lexer.nextToken()
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try:
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token = lexer.nextToken()
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raise AssertionError, token
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except antlr3.NoViableAltException, exc:
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assert exc.unexpectedType == '-', repr(exc.unexpectedType)
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assert exc.charPositionInLine == 1, repr(exc.charPositionInLine)
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assert exc.line == 1, repr(exc.line)
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if __name__ == '__main__':
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unittest.main()
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