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from typing import Callable, Optional, Union |
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3
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from typish import get_args |
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5
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from jsons._common_impl import NoneType |
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from jsons._compatibility_impl import (get_type_hints, get_union_params, |
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tuple_with_ellipsis) |
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from jsons._load_impl import load |
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from jsons.exceptions import UnfulfilledArgumentError |
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def default_tuple_deserializer(obj: list, |
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cls: type = None, |
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*, |
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key_transformer: Optional[Callable[[str], str]] = 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, key_transformer=key_transformer, **kwargs) |
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cls_args = get_args(cls) |
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if cls_args: |
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tuple_types = getattr(cls, '__tuple_params__', 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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else: |
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list_ = [load(value, **kwargs) 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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*, |
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key_transformer: Optional[Callable[[str], str]] = None, |
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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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key_tfr = key_transformer or (lambda key: key) |
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if is_dict: |
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tfm_obj = {key_tfr(k): v for k, v in obj.items()} |
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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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if is_dict: |
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field = tfm_obj[field_name] |
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else: |
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field = obj[index] |
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else: |
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field = cls._field_defaults.get(field_name, None) |
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# _field_types has been deprecated in favor of __annotations__ in Python 3.8 |
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if hasattr(cls, '__annotations__'): |
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# It is important to use get_type_hints so that forward references get resolved, |
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# rather than access __annotations__ directly |
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field_types = get_type_hints(cls) |
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else: |
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field_types = getattr(cls, '_field_types', {}) |
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if field is None: |
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hint = field_types.get(field_name) |
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if NoneType not in (get_union_params(hint) or []): |
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# The value 'None' is not permitted here. |
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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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cls_ = field_types.get(field_name) if field_types else None |
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loaded_field = load(field, cls_, key_transformer=key_transformer, **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
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