1import antlr3
2import testbase
3import unittest
4
5class t010lexer(testbase.ANTLRTest):
6    def setUp(self):
7        self.compileGrammar()
8
9
10    def lexerClass(self, base):
11        class TLexer(base):
12            def emitErrorMessage(self, msg):
13                # report errors to /dev/null
14                pass
15
16            def reportError(self, re):
17                # no error recovery yet, just crash!
18                raise re
19
20        return TLexer
21
22
23    def testValid(self):
24        stream = antlr3.StringStream('foobar _Ab98 \n A12sdf')
25        lexer = self.getLexer(stream)
26
27        token = lexer.nextToken()
28        assert token.type == self.lexerModule.IDENTIFIER
29        assert token.start == 0, token.start
30        assert token.stop == 5, token.stop
31        assert token.text == 'foobar', token.text
32
33        token = lexer.nextToken()
34        assert token.type == self.lexerModule.WS
35        assert token.start == 6, token.start
36        assert token.stop == 6, token.stop
37        assert token.text == ' ', token.text
38
39        token = lexer.nextToken()
40        assert token.type == self.lexerModule.IDENTIFIER
41        assert token.start == 7, token.start
42        assert token.stop == 11, token.stop
43        assert token.text == '_Ab98', token.text
44
45        token = lexer.nextToken()
46        assert token.type == self.lexerModule.WS
47        assert token.start == 12, token.start
48        assert token.stop == 14, token.stop
49        assert token.text == ' \n ', token.text
50
51        token = lexer.nextToken()
52        assert token.type == self.lexerModule.IDENTIFIER
53        assert token.start == 15, token.start
54        assert token.stop == 20, token.stop
55        assert token.text == 'A12sdf', token.text
56
57        token = lexer.nextToken()
58        assert token.type == self.lexerModule.EOF
59
60
61    def testMalformedInput(self):
62        stream = antlr3.StringStream('a-b')
63        lexer = self.getLexer(stream)
64
65        lexer.nextToken()
66        try:
67            token = lexer.nextToken()
68            raise AssertionError, token
69
70        except antlr3.NoViableAltException, exc:
71            assert exc.unexpectedType == '-', repr(exc.unexpectedType)
72            assert exc.charPositionInLine == 1, repr(exc.charPositionInLine)
73            assert exc.line == 1, repr(exc.line)
74
75
76
77if __name__ == '__main__':
78    unittest.main()
79