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A custom `weakref.ref` subclass which simulates a weak reference to
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c st | s t d| ^}} t| dkr0t dt| t|tf fdd }||_g |_t |_i |_ |j | | d S )NzGdescriptor '__init__' of 'WeakValueDictionary' object needs an argument z$expected at most 1 arguments, got %dc s4 | }|d k r0|j r$|jj| j n | | j d S )N)
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z$WeakValueDictionary._commit_removalsc C s4 | j r| j | j| }|d kr,t|n|S d S )N)r7 rI rB KeyError)r r9 or r r __getitem__ s
z WeakValueDictionary.__getitem__c C s | j r| j | j|= d S )N)r7 rI rB )r r9 r r r __delitem__ s z WeakValueDictionary.__delitem__c C s | j r| j t| jS )N)r7 rI r? rB )r r r r __len__ s zWeakValueDictionary.__len__c C s< | j r| j y| j| }W n tk
r2 dS X |d k S )NF)r7 rI rB rJ )r r9 rK r r r __contains__ s z WeakValueDictionary.__contains__c C s d| j jt| f S )Nz <%s at %#x>)r) r. id)r r r r __repr__ s z WeakValueDictionary.__repr__c C s& | j r| j t|| j|| j|< d S )N)r7 rI KeyedRefr@ rB )r r9 valuer r r __setitem__ s z WeakValueDictionary.__setitem__c C sF | j r| j t }x,| jj D ] \}}| }|d k r |||< q W |S )N)r7 rI r rB items)r newr9 r: rK r r r copy s zWeakValueDictionary.copyc C sZ ddl m} | jr| j | j }x2| jj D ]$\}}| }|d k r.|||||< q.W |S )Nr )deepcopy)rW rX r7 rI r) rB rU )r memorX rV r9 r: rK r r r __deepcopy__ s z WeakValueDictionary.__deepcopy__Nc C sL | j r| j y| j| }W n tk
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zWeakValueDictionary.keysc c s6 | j r| j t| | jj E dH W dQ R X dS )a Return an iterator that yields the weak references to the values.
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they are used, so the result of calling the references needs
to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the values around longer than needed.
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to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the values around longer than needed.
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c s, e Zd ZdZdZdd Z fddZ ZS )rR a[ Specialized reference that includes a key corresponding to the value.
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a function object for each key stored in the mapping. A shared
callback object can use the 'key' attribute of a KeyedRef instead
of getting a reference to the key from an enclosing scope.
r9 c C s t j| ||}||_|S )N)r r" r9 )r! obr r9 r r r r r" N s zKeyedRef.__new__c s t j|| d S )N)r' rF )r rk r r9 )r) r r rF S s zKeyedRef.__init__)r9 )r. r/ r0 r1 r2 r" rF r4 r r )r) r rR B s rR c @ s e Zd ZdZd+ddZdd Zdd Zd d
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dd Zd,ddZdd Zdd Zd d ZeZd d Zd!d" Zd#d$ Zd%d& Zd-d'd(Zd.d)d*ZdS )/r a Mapping class that references keys weakly.
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longer a strong reference to the key. This can be used to
associate additional data with an object owned by other parts of
an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
accesses.
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zWeakKeyDictionary.valuesc C s
t | jS )az Return a list of weak references to the keys.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the keys around longer than needed.
)rg rB )r r r r keyrefs s
zWeakKeyDictionary.keyrefsc C s4 d| _ x(| jj \}}| }|d k r||fS qW d S )NT)rl rB rb )r r9 rS rK r r r rb s zWeakKeyDictionary.popitemc G s d| _ | jjt|f| S )NT)rl rB rG r )r r9 rD r r r rG s zWeakKeyDictionary.popc C s | j jt|| j|S )N)rB rc r r@ )r r9 r[ r r r rc s z WeakKeyDictionary.setdefaultc K s` | j }|d k rJt|ds$ti |}x$|j D ]\}}||t|| j< q.W t|r\| j| d S )NrU )rB rd r! rU r r@ r? rC )r rf re r= r9 rS r r r rC s
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Zedd Zedd Zejdd Zdd Zedd Zedd ZdS )r a Class for finalization of weakrefable objects
finalize(obj, func, *args, **kwargs) returns a callable finalizer
object which will be called when obj is garbage collected. The
first time the finalizer is called it evaluates func(*arg, **kwargs)
and returns the result. After this the finalizer is dead, and
calling it just returns None.
When the program exits any remaining finalizers for which the
atexit attribute is true will be run in reverse order of creation.
By default atexit is true.
Fc @ s e Zd ZdZdS ) zfinalize._Infoweakrefr& rD re atexitindexN)rq r& rD re rr rs )r. r/ r0 r2 r r r r _Info s rt c O sp | j s dd l}|j| j dt_ | j }t|| |_||_||_ |pFd |_
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