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_weakrefset.py5.8 KB · 207 lines
# Access WeakSet through the weakref module.# This code is separated-out because it is needed# by abc.py to load everything else at startup. from _weakref import reffrom types import GenericAlias __all__ = ['WeakSet']  class _IterationGuard:    # This context manager registers itself in the current iterators of the    # weak container, such as to delay all removals until the context manager    # exits.    # This technique should be relatively thread-safe (since sets are).     def __init__(self, weakcontainer):        # Don't create cycles        self.weakcontainer = ref(weakcontainer)     def __enter__(self):        w = self.weakcontainer()        if w is not None:            w._iterating.add(self)        return self     def __exit__(self, e, t, b):        w = self.weakcontainer()        if w is not None:            s = w._iterating            s.remove(self)            if not s:                w._commit_removals()  class WeakSet:    def __init__(self, data=None):        self.data = set()        def _remove(item, selfref=ref(self)):            self = selfref()            if self is not None:                if self._iterating:                    self._pending_removals.append(item)                else:                    self.data.discard(item)        self._remove = _remove        # A list of keys to be removed        self._pending_removals = []        self._iterating = set()        if data is not None:            self.update(data)     def _commit_removals(self):        pop = self._pending_removals.pop        discard = self.data.discard        while True:            try:                item = pop()            except IndexError:                return            discard(item)     def __iter__(self):        with _IterationGuard(self):            for itemref in self.data:                item = itemref()                if item is not None:                    # Caveat: the iterator will keep a strong reference to                    # `item` until it is resumed or closed.                    yield item     def __len__(self):        return len(self.data) - len(self._pending_removals)     def __contains__(self, item):        try:            wr = ref(item)        except TypeError:            return False        return wr in self.data     def __reduce__(self):        return (self.__class__, (list(self),),                getattr(self, '__dict__', None))     def add(self, item):        if self._pending_removals:            self._commit_removals()        self.data.add(ref(item, self._remove))     def clear(self):        if self._pending_removals:            self._commit_removals()        self.data.clear()     def copy(self):        return self.__class__(self)     def pop(self):        if self._pending_removals:            self._commit_removals()        while True:            try:                itemref = self.data.pop()            except KeyError:                raise KeyError('pop from empty WeakSet') from None            item = itemref()            if item is not None:                return item     def remove(self, item):        if self._pending_removals:            self._commit_removals()        self.data.remove(ref(item))     def discard(self, item):        if self._pending_removals:            self._commit_removals()        self.data.discard(ref(item))     def update(self, other):        if self._pending_removals:            self._commit_removals()        for element in other:            self.add(element)     def __ior__(self, other):        self.update(other)        return self     def difference(self, other):        newset = self.copy()        newset.difference_update(other)        return newset    __sub__ = difference     def difference_update(self, other):        self.__isub__(other)    def __isub__(self, other):        if self._pending_removals:            self._commit_removals()        if self is other:            self.data.clear()        else:            self.data.difference_update(ref(item) for item in other)        return self     def intersection(self, other):        return self.__class__(item for item in other if item in self)    __and__ = intersection     def intersection_update(self, other):        self.__iand__(other)    def __iand__(self, other):        if self._pending_removals:            self._commit_removals()        self.data.intersection_update(ref(item) for item in other)        return self     def issubset(self, other):        return self.data.issubset(ref(item) for item in other)    __le__ = issubset     def __lt__(self, other):        return self.data < set(map(ref, other))     def issuperset(self, other):        return self.data.issuperset(ref(item) for item in other)    __ge__ = issuperset     def __gt__(self, other):        return self.data > set(map(ref, other))     def __eq__(self, other):        if not isinstance(other, self.__class__):            return NotImplemented        return self.data == set(map(ref, other))     def symmetric_difference(self, other):        newset = self.copy()        newset.symmetric_difference_update(other)        return newset    __xor__ = symmetric_difference     def symmetric_difference_update(self, other):        self.__ixor__(other)    def __ixor__(self, other):        if self._pending_removals:            self._commit_removals()        if self is other:            self.data.clear()        else:            self.data.symmetric_difference_update(ref(item, self._remove) for item in other)        return self     def union(self, other):        return self.__class__(e for s in (self, other) for e in s)    __or__ = union     def isdisjoint(self, other):        return len(self.intersection(other)) == 0     def __repr__(self):        return repr(self.data)     __class_getitem__ = classmethod(GenericAlias)