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from typing import Callable, Optional, Tuple |
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from typish import get_args |
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from jsons._load_impl import load |
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from jsons.exceptions import DeserializationError |
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def default_dict_deserializer( |
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obj: 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) -> dict: |
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""" |
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Deserialize a dict by deserializing all instances of that dict. |
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:param obj: the dict that needs deserializing. |
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:param key_transformer: a function that transforms the keys to a different |
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style (e.g. PascalCase). |
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:param cls: not used. |
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:param kwargs: any keyword arguments. |
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:return: a deserialized dict instance. |
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""" |
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cls_args = get_args(cls) |
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obj_, keys_were_hashed = _load_hashed_keys( |
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obj, cls, cls_args, key_transformer=key_transformer, **kwargs) |
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return _deserialize(obj_, cls_args, key_transformer, keys_were_hashed, kwargs) |
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def _load_hashed_keys( |
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obj: dict, |
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cls: type, |
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cls_args: tuple, |
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**kwargs) -> Tuple[dict, bool]: |
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# Load any hashed keys and return a copy of the given obj if any hashed |
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# keys are unpacked. |
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result = obj |
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stored_keys = set(obj.get('-keys', set())) |
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if stored_keys: |
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# Apparently, there are stored hashed keys, we need to unpack them. |
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if len(cls_args) != 2: |
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raise DeserializationError('A detailed type is needed for cls of ' |
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'the form Dict[<type>, <type>] to ' |
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'deserialize a dict with hashed keys.', |
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obj, cls) |
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result = {**obj} |
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key_type = cls_args[0] |
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for key in stored_keys: |
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# Get the original (unhashed) key and load it. |
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original_key = result['-keys'][key] |
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loaded_key = load(original_key, cls=key_type, **kwargs) |
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# Replace the hashed key by the loaded key entirely. |
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result[loaded_key] = result[key] |
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del result['-keys'][key] |
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del result[key] |
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del result['-keys'] |
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return result, len(stored_keys) > 0 |
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def _deserialize( |
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obj: dict, |
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cls_args: tuple, |
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key_transformer: Callable[[str], str], |
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keys_were_hashed: bool, |
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kwargs: dict) -> dict: |
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key_transformer = key_transformer or (lambda key: key) |
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key_func = key_transformer |
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kwargs_ = {**kwargs, 'key_transformer': key_transformer} |
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if len(cls_args) == 2: |
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cls_k, cls_v = cls_args |
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kwargs_['cls'] = cls_v |
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if not keys_were_hashed: |
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# In case of cls is something like Dict[<key>, <value>], we need to |
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# ensure that the keys in the result are <key>. If the keys were |
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# hashed though, they have been loaded already. |
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kwargs_k = {**kwargs, 'cls': cls_k} |
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key_func = lambda key: load(key_transformer(key), **kwargs_k) |
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return { |
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key_func(key): load(obj[key], **kwargs_) |
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for key in obj |
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} |
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ramonhagenaars /
jsons
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