1 import antlr3 2 import testbase 3 import unittest 4 5 class 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 65 if __name__ == '__main__': 66 unittest.main() 67
