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from typing import Union |
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from jsons._compatibility_impl import tuple_with_ellipsis |
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from jsons.exceptions import UnfulfilledArgumentError |
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from jsons._main_impl import load |
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def default_tuple_deserializer(obj: list, |
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cls: type = None, |
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**kwargs) -> object: |
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""" |
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Deserialize a (JSON) list into a tuple by deserializing all items of that |
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list. |
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:param obj: the tuple that needs deserializing. |
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:param cls: the type optionally with a generic (e.g. Tuple[str, int]). |
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:param kwargs: any keyword arguments. |
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:return: a deserialized tuple instance. |
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""" |
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if hasattr(cls, '_fields'): |
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return default_namedtuple_deserializer(obj, cls, **kwargs) |
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tuple_types = getattr(cls, '__tuple_params__', getattr(cls, '__args__', [])) |
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if tuple_with_ellipsis(cls): |
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tuple_types = [tuple_types[0]] * len(obj) |
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list_ = [load(value, tuple_types[i], **kwargs) |
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for i, value in enumerate(obj)] |
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return tuple(list_) |
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def default_namedtuple_deserializer( |
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obj: Union[list, dict], |
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cls: type, |
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**kwargs) -> object: |
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""" |
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Deserialize a (JSON) list or dict into a named tuple by deserializing all |
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items of that list/dict. |
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:param obj: the tuple that needs deserializing. |
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:param cls: the NamedTuple. |
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:param kwargs: any keyword arguments. |
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:return: a deserialized named tuple (i.e. an instance of a class). |
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""" |
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is_dict = isinstance(obj, dict) |
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args = [] |
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for index, field_name in enumerate(cls._fields): |
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if index < len(obj): |
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key = field_name if is_dict else index |
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field = obj[key] |
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else: |
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field = cls._field_defaults.get(field_name, None) |
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if field is None: |
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msg = ('No value present in {} for argument "{}"' |
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.format(obj, field_name)) |
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raise UnfulfilledArgumentError(msg, field_name, obj, cls) |
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field_types = getattr(cls, '_field_types', None) |
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cls_ = field_types.get(field_name) if field_types else None |
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loaded_field = load(field, cls_, **kwargs) |
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args.append(loaded_field) |
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inst = cls(*args) |
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return inst |
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ramonhagenaars /
jsons
