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1import antlr3
2import testbase
3import unittest
4
5class t009lexer(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('085')
25        lexer = self.getLexer(stream)
26
27        token = lexer.nextToken()
28        self.assertEqual(token.type, self.lexerModule.DIGIT)
29        self.assertEqual(token.start, 0)
30        self.assertEqual(token.stop, 0)
31        self.assertEqual(token.text, '0')
32
33        token = lexer.nextToken()
34        self.assertEqual(token.type, self.lexerModule.DIGIT)
35        self.assertEqual(token.start, 1)
36        self.assertEqual(token.stop, 1)
37        self.assertEqual(token.text, '8')
38
39        token = lexer.nextToken()
40        self.assertEqual(token.type, self.lexerModule.DIGIT)
41        self.assertEqual(token.start, 2)
42        self.assertEqual(token.stop, 2)
43        self.assertEqual(token.text, '5')
44
45        token = lexer.nextToken()
46        self.assertEqual(token.type, self.lexerModule.EOF)
47
48
49    def testMalformedInput(self):
50        stream = antlr3.StringStream('2a')
51        lexer = self.getLexer(stream)
52
53        lexer.nextToken()
54        try:
55            token = lexer.nextToken()
56            self.fail(token)
57
58        except antlr3.MismatchedSetException as exc:
59            # TODO: This should provide more useful information
60            self.assertIsNone(exc.expecting)
61            self.assertEqual(exc.unexpectedType, 'a')
62            self.assertEqual(exc.charPositionInLine, 1)
63            self.assertEqual(exc.line, 1)
64
65
66if __name__ == '__main__':
67    unittest.main()
68