def test_recursive_common(self):
# Test a recursive parser to decode xml style data
embedded = Sequence('embedded', [])
digit = Field('data', 8, constraints=[Minimum(ord('0')), Maximum(ord('9'))])
item = Choice('item', [embedded, digit])
embedded.children = [
Field('', length=8, format=Field.TEXT, constraints=[Equals('<')]),
item,
Field('', length=8, format=Field.TEXT, constraints=[Equals('>')])]
# Lets just test that we can decode things correctly...
list(item.decode(Data('8')))
list(item.decode(Data('<5>')))
list(item.decode(Data('<<7>>')))
self.assertRaises(bdec.DecodeError, list, item.decode(Data('a')))
self.assertRaises(bdec.DecodeError, list, item.decode(Data('<5')))
lookup = ResultParameters([item])
self.assertEqual([Param('result', Param.OUT, EntryType(item))], lookup.get_params(item))
self.assertEqual([Param('result', Param.OUT, EntryType(embedded))], lookup.get_params(embedded))
