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__init__.py
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json_serializable.py
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from typing import Optional, Type from jsons._common_impl import StateHolder, T from jsons._dump_impl import dump, dumps, dumpb from jsons._fork_impl import fork from jsons._lizers_impl import set_serializer, set_deserializer from jsons._load_impl import load, loads, loadb class JsonSerializable(StateHolder): """ This class offers an alternative to using the ``jsons.load`` and ``jsons.dump`` methods. An instance of a class that inherits from ``JsonSerializable`` has the ``json`` property, which value is equivalent to calling ``jsons.dump`` on that instance. Furthermore, you can call ``from_json`` on that class, which is equivalent to calling ``json.load`` with that class as an argument. """ @classmethod def fork(cls, name: Optional[str] = None) -> Type['JsonSerializable']: """ Create a 'fork' of ``JsonSerializable``: a new ``type`` with a separate configuration of serializers and deserializers. :param name: the ``__name__`` of the new ``type``. :return: a new ``type`` based on ``JsonSerializable``. """ return fork(cls, name=name) @classmethod def with_dump(cls, fork: Optional[bool] = False, **kwargs) \ -> Type['JsonSerializable']: """ Return a class (``type``) that is based on JsonSerializable with the ``dump`` method being automatically provided the given ``kwargs``. **Example:** >>> custom_serializable = JsonSerializable\ .with_dump(key_transformer=KEY_TRANSFORMER_CAMELCASE) >>> class Person(custom_serializable): ... def __init__(self, my_name): ... self.my_name = my_name >>> p = Person('John') >>> p.json {'myName': 'John'} :param kwargs: the keyword args that are automatically provided to the ``dump`` method. :param fork: determines that a new fork is to be created. :return: a class with customized behavior. """ def _wrapper(inst, **kwargs_): return dump(inst, **{**kwargs_, **kwargs}) type_ = cls.fork() if fork else cls type_.dump = _wrapper return type_ @classmethod def with_load(cls, fork: Optional[bool] = False, **kwargs) \ -> Type['JsonSerializable']: """ Return a class (``type``) that is based on JsonSerializable with the ``load`` method being automatically provided the given ``kwargs``. **Example:** >>> custom_serializable = JsonSerializable\ .with_load(key_transformer=KEY_TRANSFORMER_SNAKECASE) >>> class Person(custom_serializable): ... def __init__(self, my_name): ... self.my_name = my_name >>> p_json = {'myName': 'John'} >>> p = Person.from_json(p_json) >>> p.my_name 'John' :param kwargs: the keyword args that are automatically provided to the ``load`` method. :param fork: determines that a new fork is to be created. :return: a class with customized behavior. """ @classmethod def _wrapper(cls_, inst, **kwargs_): return load(inst, cls_, fork_inst=cls_, **{**kwargs_, **kwargs}) type_ = cls.fork() if fork else cls type_.load = _wrapper return type_ @property def json(self) -> object: """ See ``jsons.dump``. :return: this instance in a JSON representation (dict). """ return self.dump() def __str__(self) -> str: """ See ``jsons.dumps``. :return: this instance as a JSON string. """ return self.dumps() @classmethod def from_json(cls: Type[T], json_obj: object, **kwargs) -> T: """ See ``jsons.load``. :param json_obj: a JSON representation of an instance of the inheriting class :param kwargs: the keyword args are passed on to the deserializer function. :return: an instance of the inheriting class. """ return cls.load(json_obj, **kwargs) def dump(self, **kwargs) -> object: """ See ``jsons.dump``. :param kwargs: the keyword args are passed on to the serializer function. :return: this instance in a JSON representation (dict). """ return dump(self, fork_inst=self.__class__, **kwargs) @classmethod def load(cls: Type[T], json_obj: object, **kwargs) -> T: """ See ``jsons.load``. :param kwargs: the keyword args are passed on to the serializer function. :param json_obj: the object that is loaded into an instance of `cls`. :return: this instance in a JSON representation (dict). """ return load(json_obj, cls, fork_inst=cls, **kwargs) def dumps(self, **kwargs) -> str: """ See ``jsons.dumps``. :param kwargs: the keyword args are passed on to the serializer function. :return: this instance as a JSON string. """ return dumps(self, fork_inst=self.__class__, **kwargs) @classmethod def loads(cls: Type[T], json_obj: str, **kwargs) -> T: """ See ``jsons.loads``. :param kwargs: the keyword args are passed on to the serializer function. :param json_obj: the object that is loaded into an instance of `cls`. :return: this instance in a JSON representation (dict). """ return loads(json_obj, cls, fork_inst=cls, **kwargs) def dumpb(self, **kwargs) -> bytes: """ See ``jsons.dumpb``. :param kwargs: the keyword args are passed on to the serializer function. :return: this instance as a JSON string. """ return dumpb(self, fork_inst=self.__class__, **kwargs) @classmethod def loadb(cls: Type[T], json_obj: bytes, **kwargs) -> T: """ See ``jsons.loadb``. :param kwargs: the keyword args are passed on to the serializer function. :param json_obj: the object that is loaded into an instance of `cls`. :return: this instance in a JSON representation (dict). """ return loadb(json_obj, cls, fork_inst=cls, **kwargs) @classmethod def set_serializer(cls: Type[T], func: callable, cls_: type, high_prio: Optional[bool] = True, fork: Optional[bool] = False) -> T: """ See ``jsons.set_serializer``. :param func: the serializer function. :param cls_: the type this serializer can handle. :param high_prio: determines the order in which is looked for the callable. :param fork: determines that a new fork is to be created. :return: the type on which this method is invoked or its fork. """ type_ = cls.fork() if fork else cls set_serializer(func, cls_, high_prio, type_) return type_ @classmethod def set_deserializer(cls: Type[T], func: callable, cls_: type, high_prio: Optional[bool] = True, fork: Optional[bool] = False) -> T: """ See ``jsons.set_deserializer``. :param func: the deserializer function. :param cls_: the type this serializer can handle. :param high_prio: determines the order in which is looked for the callable. :param fork: determines that a new fork is to be created. :return: the type on which this method is invoked or its fork. """ type_ = cls.fork() if fork else cls set_deserializer(func, cls_, high_prio, type_) return type_