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abc.py
# Copyright 2007 Google, Inc. All Rights Reserved. # Licensed to PSF under a Contributor Agreement. """Abstract Base Classes (ABCs) according to PEP 3119.""" import types from _weakrefset import WeakSet # Instance of old-style class class _C: pass _InstanceType = type(_C()) def abstractmethod(funcobj): """A decorator indicating abstract methods. Requires that the metaclass is ABCMeta or derived from it. A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract methods are overridden. The abstract methods can be called using any of the normal 'super' call mechanisms. Usage: class C: __metaclass__ = ABCMeta @abstractmethod def my_abstract_method(self, ...): ... """ funcobj.__isabstractmethod__ = True return funcobj class abstractproperty(property): """A decorator indicating abstract properties. Requires that the metaclass is ABCMeta or derived from it. A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract properties are overridden. The abstract properties can be called using any of the normal 'super' call mechanisms. Usage: class C: __metaclass__ = ABCMeta @abstractproperty def my_abstract_property(self): ... This defines a read-only property; you can also define a read-write abstract property using the 'long' form of property declaration: class C: __metaclass__ = ABCMeta def getx(self): ... def setx(self, value): ... x = abstractproperty(getx, setx) """ __isabstractmethod__ = True class ABCMeta(type): """Metaclass for defining Abstract Base Classes (ABCs). Use this metaclass to create an ABC. An ABC can be subclassed directly, and then acts as a mix-in class. You can also register unrelated concrete classes (even built-in classes) and unrelated ABCs as 'virtual subclasses' -- these and their descendants will be considered subclasses of the registering ABC by the built-in issubclass() function, but the registering ABC won't show up in their MRO (Method Resolution Order) nor will method implementations defined by the registering ABC be callable (not even via super()). """ # A global counter that is incremented each time a class is # registered as a virtual subclass of anything. It forces the # negative cache to be cleared before its next use. _abc_invalidation_counter = 0 def __new__(mcls, name, bases, namespace): cls = super(ABCMeta, mcls).__new__(mcls, name, bases, namespace) # Compute set of abstract method names abstracts = set(name for name, value in namespace.items() if getattr(value, "__isabstractmethod__", False)) for base in bases: for name in getattr(base, "__abstractmethods__", set()): value = getattr(cls, name, None) if getattr(value, "__isabstractmethod__", False): abstracts.add(name) cls.__abstractmethods__ = frozenset(abstracts) # Set up inheritance registry cls._abc_registry = WeakSet() cls._abc_cache = WeakSet() cls._abc_negative_cache = WeakSet() cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter return cls def register(cls, subclass): """Register a virtual subclass of an ABC.""" if not isinstance(subclass, (type, types.ClassType)): raise TypeError("Can only register classes") if issubclass(subclass, cls): return # Already a subclass # Subtle: test for cycles *after* testing for "already a subclass"; # this means we allow X.register(X) and interpret it as a no-op. if issubclass(cls, subclass): # This would create a cycle, which is bad for the algorithm below raise RuntimeError("Refusing to create an inheritance cycle") cls._abc_registry.add(subclass) ABCMeta._abc_invalidation_counter += 1 # Invalidate negative cache def _dump_registry(cls, file=None): """Debug helper to print the ABC registry.""" print >> file, "Class: %s.%s" % (cls.__module__, cls.__name__) print >> file, "Inv.counter: %s" % ABCMeta._abc_invalidation_counter for name in sorted(cls.__dict__.keys()): if name.startswith("_abc_"): value = getattr(cls, name) print >> file, "%s: %r" % (name, value) def __instancecheck__(cls, instance): """Override for isinstance(instance, cls).""" # Inline the cache checking when it's simple. subclass = getattr(instance, '__class__', None) if subclass is not None and subclass in cls._abc_cache: return True subtype = type(instance) # Old-style instances if subtype is _InstanceType: subtype = subclass if subtype is subclass or subclass is None: if (cls._abc_negative_cache_version == ABCMeta._abc_invalidation_counter and subtype in cls._abc_negative_cache): return False # Fall back to the subclass check. return cls.__subclasscheck__(subtype) return (cls.__subclasscheck__(subclass) or cls.__subclasscheck__(subtype)) def __subclasscheck__(cls, subclass): """Override for issubclass(subclass, cls).""" # Check cache if subclass in cls._abc_cache: return True # Check negative cache; may have to invalidate if cls._abc_negative_cache_version < ABCMeta._abc_invalidation_counter: # Invalidate the negative cache cls._abc_negative_cache = WeakSet() cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter elif subclass in cls._abc_negative_cache: return False # Check the subclass hook ok = cls.__subclasshook__(subclass) if ok is not NotImplemented: assert isinstance(ok, bool) if ok: cls._abc_cache.add(subclass) else: cls._abc_negative_cache.add(subclass) return ok # Check if it's a direct subclass if cls in getattr(subclass, '__mro__', ()): cls._abc_cache.add(subclass) return True # Check if it's a subclass of a registered class (recursive) for rcls in cls._abc_registry: if issubclass(subclass, rcls): cls._abc_cache.add(subclass) return True # Check if it's a subclass of a subclass (recursive) for scls in cls.__subclasses__(): if issubclass(subclass, scls): cls._abc_cache.add(subclass) return True # No dice; update negative cache cls._abc_negative_cache.add(subclass) return False
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