1 import antlr3 2 import testbase 3 import unittest 4 5 class t007lexer(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('fofababbooabb') 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 == 1, token.stop 31 assert token.text == 'fo', token.text 32 33 token = lexer.nextToken() 34 assert token.type == self.lexerModule.FOO 35 assert token.start == 2, token.start 36 assert token.stop == 12, token.stop 37 assert token.text == 'fababbooabb', token.text 38 39 token = lexer.nextToken() 40 assert token.type == self.lexerModule.EOF 41 42 43 def testMalformedInput(self): 44 stream = antlr3.StringStream('foaboao') 45 lexer = self.getLexer(stream) 46 47 try: 48 token = lexer.nextToken() 49 raise AssertionError, token 50 51 except antlr3.EarlyExitException, exc: 52 assert exc.unexpectedType == 'o', repr(exc.unexpectedType) 53 assert exc.charPositionInLine == 6, repr(exc.charPositionInLine) 54 assert exc.line == 1, repr(exc.line) 55 56 57 if __name__ == '__main__': 58 unittest.main() 59 60
