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Path: /opt/alt/python311/lib/python3.11/site-packages/typish/classes/

Viewing File: _something.py

import types
from collections import OrderedDict
from typing import Any, Dict, Callable, Tuple

from typish.classes._subscriptable_type import SubscriptableType


class _SomethingMeta(SubscriptableType):
    """
    This metaclass is coupled to ``Something``.
    """
    def __instancecheck__(self, instance: object) -> bool:
        # Check if all attributes from self.signature are also present in
        # instance and also check that their types correspond.
        from typish.functions._instance_of import instance_of

        sig = self.signature()
        for key in sig:
            attr = getattr(instance, key, None)
            if not attr or not instance_of(attr, sig[key]):
                return False
        return True

    def __subclasscheck__(self, subclass: type) -> bool:
        # If an instance of type subclass is an instance of self, then subclass
        # is a sub class of self.
        from typish.functions._subclass_of import subclass_of
        from typish.functions._get_type_hints_of_callable import get_args_and_return_type

        self_sig = self.signature()
        other_sig = Something.like(subclass).signature()
        for attr in self_sig:
            if attr in other_sig:
                attr_sig = other_sig[attr]
                if (not isinstance(subclass.__dict__[attr], staticmethod)
                        and not isinstance(subclass.__dict__[attr], classmethod)
                        and subclass_of(attr_sig, Callable)):
                    # The attr must be a regular method or class method, so the
                    # first parameter should be ignored.
                    args, rt = get_args_and_return_type(attr_sig)
                    attr_sig = Callable[list(args[1:]), rt]
                if not subclass_of(attr_sig, self_sig[attr]):
                    return False
        return True

    def __eq__(self, other: 'Something') -> bool:
        return (isinstance(other, _SomethingMeta)
                and self.signature() == other.signature())

    def __repr__(self):
        sig = self.signature()
        sig_ = ', '.join(["'{}': {}".format(k, self._type_repr(sig[k]))
                          for k in sig])
        return 'typish.Something[{}]'.format(sig_)

    def __hash__(self):
        # This explicit super call is required for Python 3.5 and 3.6.
        return super.__hash__(self)

    def _type_repr(self, obj):
        """Return the repr() of an object, special-casing types (internal helper).

        If obj is a type, we return a shorter version than the default
        type.__repr__, based on the module and qualified name, which is
        typically enough to uniquely identify a type.  For everything
        else, we fall back on repr(obj).
        """
        if isinstance(obj, type) and not issubclass(obj, Callable):
            return obj.__qualname__
        if obj is ...:
            return '...'
        if isinstance(obj, types.FunctionType):
            return obj.__name__
        return repr(obj)


class Something(type, metaclass=_SomethingMeta):
    """
    This class allows one to define an interface for something that has some
    attributes, such as objects or classes or maybe even modules.
    """
    @classmethod
    def signature(mcs) -> Dict[str, type]:
        """
        Return the signature of this ``Something`` as a dict.
        :return: a dict with attribute names as keys and types as values.
        """
        result = OrderedDict()
        args = mcs.__args__
        if isinstance(mcs.__args__, slice):
            args = (mcs.__args__,)

        arg_keys = sorted(args)
        if isinstance(mcs.__args__, dict):
            for key in arg_keys:
                result[key] = mcs.__args__[key]
        else:
            for slice_ in arg_keys:
                result[slice_.start] = slice_.stop
        return result

    def __getattr__(cls, item):
        # This method exists solely to fool the IDE into believing that
        # Something can have any attribute.
        return type.__getattr__(cls, item)  # pragma: no cover

    @staticmethod
    def like(obj: Any, exclude_privates: bool = True) -> 'Something':
        """
        Return a ``Something`` for the given ``obj``.
        :param obj: the object of which a ``Something`` is to be made.
        :param exclude_privates: if ``True``, private variables are excluded.
        :return: a ``Something`` that corresponds to ``obj``.
        """
        from typish.functions._get_type import get_type

        signature = {attr: get_type(getattr(obj, attr)) for attr in dir(obj)
                     if not exclude_privates or not attr.startswith('_')}
        return Something[signature]


TypingType = Something['__origin__': type, '__args__': Tuple[type, ...]]
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