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import antlr3
import testbase
import unittest
class t005lexer(testbase.ANTLRTest):
def setUp(self):
self.compileGrammar()
def lexerClass(self, base):
class TLexer(base):
def emitErrorMessage(self, msg):
# report errors to /dev/null
pass
def reportError(self, re):
# no error recovery yet, just crash!
raise re
return TLexer
def testValid(self):
stream = antlr3.StringStream('fofoofooo')
lexer = self.getLexer(stream)
token = lexer.nextToken()
self.assertEqual(token.type, self.lexerModule.FOO)
self.assertEqual(token.start, 0)
self.assertEqual(token.stop, 1)
self.assertEqual(token.text, 'fo')
token = lexer.nextToken()
self.assertEqual(token.type, self.lexerModule.FOO)
self.assertEqual(token.start, 2)
self.assertEqual(token.stop, 4)
self.assertEqual(token.text, 'foo')
token = lexer.nextToken()
self.assertEqual(token.type, self.lexerModule.FOO)
self.assertEqual(token.start, 5)
self.assertEqual(token.stop, 8)
self.assertEqual(token.text, 'fooo')
token = lexer.nextToken()
self.assertEqual(token.type, self.lexerModule.EOF)
def testMalformedInput1(self):
stream = antlr3.StringStream('2')
lexer = self.getLexer(stream)
try:
token = lexer.nextToken()
self.fail()
except antlr3.MismatchedTokenException as exc:
self.assertEqual(exc.expecting, 'f')
self.assertEqual(exc.unexpectedType, '2')
def testMalformedInput2(self):
stream = antlr3.StringStream('f')
lexer = self.getLexer(stream)
try:
token = lexer.nextToken()
self.fail()
except antlr3.EarlyExitException as exc:
self.assertEqual(exc.unexpectedType, antlr3.EOF)
if __name__ == '__main__':
unittest.main()
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