| from inspect import isclass |
|
|
| from .props import props |
|
|
|
|
| class SubclassWithMeta_Meta(type): |
| _meta = None |
|
|
| def __str__(cls): |
| if cls._meta: |
| return cls._meta.name |
| return cls.__name__ |
|
|
| def __repr__(cls): |
| return f"<{cls.__name__} meta={repr(cls._meta)}>" |
|
|
|
|
| class SubclassWithMeta(metaclass=SubclassWithMeta_Meta): |
| """This class improves __init_subclass__ to receive automatically the options from meta""" |
|
|
| def __init_subclass__(cls, **meta_options): |
| """This method just terminates the super() chain""" |
| _Meta = getattr(cls, "Meta", None) |
| _meta_props = {} |
| if _Meta: |
| if isinstance(_Meta, dict): |
| _meta_props = _Meta |
| elif isclass(_Meta): |
| _meta_props = props(_Meta) |
| else: |
| raise Exception( |
| f"Meta have to be either a class or a dict. Received {_Meta}" |
| ) |
| delattr(cls, "Meta") |
| options = dict(meta_options, **_meta_props) |
|
|
| abstract = options.pop("abstract", False) |
| if abstract: |
| assert not options, ( |
| "Abstract types can only contain the abstract attribute. " |
| f"Received: abstract, {', '.join(options)}" |
| ) |
| else: |
| super_class = super(cls, cls) |
| if hasattr(super_class, "__init_subclass_with_meta__"): |
| super_class.__init_subclass_with_meta__(**options) |
|
|
| @classmethod |
| def __init_subclass_with_meta__(cls, **meta_options): |
| """This method just terminates the super() chain""" |
|
|
