1import antlr3
2import testbase
3import unittest
4
5class t004lexer(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('ffofoofooo')
25        lexer = self.getLexer(stream)
26
27        token = lexer.nextToken()
28        assert token.type == self.lexerModule.FOO
29        assert token.start == 0, token.start
30        assert token.stop == 0, token.stop
31        assert token.text == 'f', token.text
32
33        token = lexer.nextToken()
34        assert token.type == self.lexerModule.FOO
35        assert token.start == 1, token.start
36        assert token.stop == 2, token.stop
37        assert token.text == 'fo', token.text
38
39        token = lexer.nextToken()
40        assert token.type == self.lexerModule.FOO
41        assert token.start == 3, token.start
42        assert token.stop == 5, token.stop
43        assert token.text == 'foo', token.text
44
45        token = lexer.nextToken()
46        assert token.type == self.lexerModule.FOO
47        assert token.start == 6, token.start
48        assert token.stop == 9, token.stop
49        assert token.text == 'fooo', token.text
50
51        token = lexer.nextToken()
52        assert token.type == self.lexerModule.EOF
53
54
55    def testMalformedInput(self):
56        stream = antlr3.StringStream('2')
57        lexer = self.getLexer(stream)
58
59        try:
60            token = lexer.nextToken()
61            self.fail()
62
63        except antlr3.MismatchedTokenException, exc:
64            self.failUnlessEqual(exc.expecting, 'f')
65            self.failUnlessEqual(exc.unexpectedType, '2')
66
67
68if __name__ == '__main__':
69    unittest.main()
70
71