14 TaggedObject = collections.namedtuple(
22 def _make_tag_only_serializer(tag, expected_value):
26 assert to.instance == expected_value
31 def _make_struct_serializer(fmt):
33 packer = functools.partial(struct.pack, fmt)
36 return packer(to.tag, to.instance)
40 _TAGS_TO_SERIALIZERS = {
41 TAG_NULL: _make_tag_only_serializer(TAG_NULL, None),
42 TAG_TRUE: _make_tag_only_serializer(TAG_TRUE, True),
43 TAG_FALSE: _make_tag_only_serializer(TAG_FALSE, False),
44 TAG_UINT8: _make_struct_serializer('B'),
45 TAG_UINT16: _make_struct_serializer('H'),
46 TAG_UINT32: _make_struct_serializer('I'),
47 TAG_UINT64: _make_struct_serializer('Q'),
51 return _TAGS_TO_SERIALIZERS[to.tag](to)
53 def _make_tag_only_parser(tag, value):
55 return TaggedObject(tag = tag, instance = value)
59 def _make_struct_deserializer(tag, fmt):
61 size = struct.calcsize(fmt)
62 unpacker = functools.partial(struct.unpack, fmt)
67 return TaggedObject(tag = tag, instance = unpacker(b)[0])
72 TAG_NULL: _make_tag_only_parser(TAG_NULL, None),
73 TAG_TRUE: _make_tag_only_parser(TAG_TRUE, True),
74 TAG_FALSE: _make_tag_only_parser(TAG_FALSE, False),
75 TAG_UINT8: _make_struct_deserializer(TAG_UINT8, 'B'),
76 TAG_UINT16: _make_struct_deserializer(TAG_UINT16, 'H'),
77 TAG_UINT32: _make_struct_deserializer(TAG_UINT32, 'I'),
78 TAG_UINT64: _make_struct_deserializer(TAG_UINT64, 'Q'),
82 if isinstance(b, bytes):
87 result = _TAGS_TO_PARSERS[tag](b)
91 if len(remainder) == 0:
94 raise Exception('Unable to parse remainder: {}'.format(remainder))