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1import antlr3
2import testbase
3import unittest
4
5class t006lexer(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('fofaaooa')
25        lexer = self.getLexer(stream)
26
27        token = lexer.nextToken()
28        self.assertEqual(token.type, self.lexerModule.FOO)
29        self.assertEqual(token.start, 0)
30        self.assertEqual(token.stop, 1)
31        self.assertEqual(token.text, 'fo')
32
33        token = lexer.nextToken()
34        self.assertEqual(token.type, self.lexerModule.FOO)
35        self.assertEqual(token.start, 2)
36        self.assertEqual(token.stop, 7)
37        self.assertEqual(token.text, 'faaooa')
38
39        token = lexer.nextToken()
40        self.assertEqual(token.type, self.lexerModule.EOF)
41
42
43    def testMalformedInput(self):
44        stream = antlr3.StringStream('fofoaooaoa2')
45        lexer = self.getLexer(stream)
46
47        lexer.nextToken()
48        lexer.nextToken()
49        try:
50            token = lexer.nextToken()
51            self.fail(token)
52
53        except antlr3.MismatchedTokenException as exc:
54            self.assertEqual(exc.expecting, 'f')
55            self.assertEqual(exc.unexpectedType, '2')
56            self.assertEqual(exc.charPositionInLine, 10)
57            self.assertEqual(exc.line, 1)
58
59
60if __name__ == '__main__':
61    unittest.main()
62