|
1
|
|
|
from typing import Union |
|
2
|
|
|
from typish import get_args |
|
3
|
|
|
from jsons._common_impl import NoneType |
|
4
|
|
|
from jsons._compatibility_impl import tuple_with_ellipsis, get_union_params |
|
5
|
|
|
from jsons._load_impl import load |
|
6
|
|
|
from jsons.exceptions import UnfulfilledArgumentError |
|
7
|
|
|
|
|
8
|
|
|
|
|
9
|
|
|
def default_tuple_deserializer(obj: list, |
|
10
|
|
|
cls: type = None, |
|
11
|
|
|
**kwargs) -> object: |
|
12
|
|
|
""" |
|
13
|
|
|
Deserialize a (JSON) list into a tuple by deserializing all items of that |
|
14
|
|
|
list. |
|
15
|
|
|
:param obj: the tuple that needs deserializing. |
|
16
|
|
|
:param cls: the type optionally with a generic (e.g. Tuple[str, int]). |
|
17
|
|
|
:param kwargs: any keyword arguments. |
|
18
|
|
|
:return: a deserialized tuple instance. |
|
19
|
|
|
""" |
|
20
|
|
|
if hasattr(cls, '_fields'): |
|
21
|
|
|
return default_namedtuple_deserializer(obj, cls, **kwargs) |
|
22
|
|
|
cls_args = get_args(cls) |
|
23
|
|
|
if cls_args: |
|
24
|
|
|
tuple_types = getattr(cls, '__tuple_params__', cls_args) |
|
25
|
|
|
if tuple_with_ellipsis(cls): |
|
26
|
|
|
tuple_types = [tuple_types[0]] * len(obj) |
|
27
|
|
|
list_ = [load(value, tuple_types[i], **kwargs) |
|
28
|
|
|
for i, value in enumerate(obj)] |
|
29
|
|
|
else: |
|
30
|
|
|
list_ = [load(value, **kwargs) for i, value in enumerate(obj)] |
|
31
|
|
|
return tuple(list_) |
|
32
|
|
|
|
|
33
|
|
|
|
|
34
|
|
|
def default_namedtuple_deserializer( |
|
35
|
|
|
obj: Union[list, dict], |
|
36
|
|
|
cls: type, |
|
37
|
|
|
**kwargs) -> object: |
|
38
|
|
|
""" |
|
39
|
|
|
Deserialize a (JSON) list or dict into a named tuple by deserializing all |
|
40
|
|
|
items of that list/dict. |
|
41
|
|
|
:param obj: the tuple that needs deserializing. |
|
42
|
|
|
:param cls: the NamedTuple. |
|
43
|
|
|
:param kwargs: any keyword arguments. |
|
44
|
|
|
:return: a deserialized named tuple (i.e. an instance of a class). |
|
45
|
|
|
""" |
|
46
|
|
|
is_dict = isinstance(obj, dict) |
|
47
|
|
|
args = [] |
|
48
|
|
|
for index, field_name in enumerate(cls._fields): |
|
49
|
|
|
if index < len(obj): |
|
50
|
|
|
key = field_name if is_dict else index |
|
51
|
|
|
field = obj[key] |
|
52
|
|
|
else: |
|
53
|
|
|
field = cls._field_defaults.get(field_name, None) |
|
54
|
|
|
|
|
55
|
|
|
# _field_types has been deprecated in favor of __annotations__ in Python 3.8 |
|
56
|
|
|
if hasattr(cls, '__annotations__'): |
|
57
|
|
|
field_types = getattr(cls, '__annotations__', {}) |
|
58
|
|
|
else: |
|
59
|
|
|
field_types = getattr(cls, '_field_types', {}) |
|
60
|
|
|
|
|
61
|
|
|
if field is None: |
|
62
|
|
|
hint = field_types.get(field_name) |
|
63
|
|
|
if NoneType not in (get_union_params(hint) or []): |
|
64
|
|
|
# The value 'None' is not permitted here. |
|
65
|
|
|
msg = ('No value present in {} for argument "{}"' |
|
66
|
|
|
.format(obj, field_name)) |
|
67
|
|
|
raise UnfulfilledArgumentError(msg, field_name, obj, cls) |
|
68
|
|
|
cls_ = field_types.get(field_name) if field_types else None |
|
69
|
|
|
loaded_field = load(field, cls_, **kwargs) |
|
70
|
|
|
args.append(loaded_field) |
|
71
|
|
|
inst = cls(*args) |
|
72
|
|
|
return inst |
|
73
|
|
|
|
ramonhagenaars /
jsons
