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1import antlr3
2import testbase
3import unittest
4
5class t008lexer(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('ffaf')
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, 0)
31        self.assertEqual(token.text, 'f')
32
33        token = lexer.nextToken()
34        self.assertEqual(token.type, self.lexerModule.FOO)
35        self.assertEqual(token.start, 1)
36        self.assertEqual(token.stop, 2)
37        self.assertEqual(token.text, 'fa')
38
39        token = lexer.nextToken()
40        self.assertEqual(token.type, self.lexerModule.FOO)
41        self.assertEqual(token.start, 3)
42        self.assertEqual(token.stop, 3)
43        self.assertEqual(token.text, 'f')
44
45        token = lexer.nextToken()
46        self.assertEqual(token.type, self.lexerModule.EOF)
47
48
49    def testMalformedInput(self):
50        stream = antlr3.StringStream('fafb')
51        lexer = self.getLexer(stream)
52
53        lexer.nextToken()
54        lexer.nextToken()
55        try:
56            token = lexer.nextToken()
57            self.fail(token)
58
59        except antlr3.MismatchedTokenException as exc:
60            self.assertEqual(exc.unexpectedType, 'b')
61            self.assertEqual(exc.charPositionInLine, 3)
62            self.assertEqual(exc.line, 1)
63
64
65if __name__ == '__main__':
66    unittest.main()
67