def test_either_fails(self):
c = char('c')
x = char('x')
parser = either(c, x)
stream = Stream('i')
with self.assertRaises(ParseFailure):
parser(stream)
def test_either_ok_two(self):
c = char('c')
x = char('x')
parser = either(c, x)
stream = Stream('xirotanibmoc')
out, stream = parser(stream)
self.assertEqual(out, 'x')
self.assertEqual(stream.position, 1)
def test_either_ok_one(self):
c = char('c')
x = char('x')
parser = either(c, x)
stream = Stream('combinatorix')
out, stream = parser(stream)
self.assertEqual(out, 'c')
self.assertEqual(stream.position, 1)