def _value_from_json()

in pytext/config/serialize.py [0:0]

• 27 lines of code
• 15 McCabe index (conditional complexity)

def _value_from_json(cls, value):
    cls_type = _get_class_type(cls)
    if value is None:
        return value
    # Unions must be first because Union explicitly doesn't
    # support __subclasscheck__.
    # optional with more than 2 classes is treated as Union
    elif _is_optional(cls) and len(cls.__args__) == 2:
        sub_cls = cls.__args__[0] if type(None) != cls.__args__[0] else cls.__args__[1]
        return _value_from_json(sub_cls, value)
    # nested config
    elif hasattr(cls, "_fields"):
        return config_from_json(cls, value)
    elif cls_type == Any:
        return _any_from_json(value)
    elif cls_type == Union:
        return _union_from_json(cls.__args__, value)
    elif issubclass(cls_type, Enum):
        return _enum_from_json(cls, value)
    elif issubclass(cls_type, List):
        sub_cls = cls.__args__[0]
        return [_value_from_json(sub_cls, v) for v in value]
    elif issubclass(cls_type, Tuple):
        return tuple(
            _value_from_json(c, v)
            for c, v in zip(_extend_tuple_type(cls, value), value)
        )
    elif issubclass(cls_type, Dict):
        sub_cls = cls.__args__[1]
        return {key: _value_from_json(sub_cls, v) for key, v in value.items()}
    # built in types
    return cls(value)