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Edit File : _weakrefset.py \| Size : 5.75 KB
# 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 ref from 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),), self.__getstate__() 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) Back

Edit File : _weakrefset.py | Size : 5.75 KB

# 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 ref
from 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),), self.__getstate__()

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)

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