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weakref.cpython-39.pyc
a DOg8T @ s d Z ddlmZmZmZmZmZmZmZm Z ddl m Z m Z ddl Z ddlZddlZeefZg dZe je e je G dd deZG dd d e jZG d d d eZG d d d e jZG dd dZdS )z|Weak reference support for Python. This module is an implementation of PEP 205: https://www.python.org/dev/peps/pep-0205/ )getweakrefcount getweakrefsrefproxyCallableProxyType ProxyType ReferenceType_remove_dead_weakref)WeakSet_IterationGuardN) r r r r WeakKeyDictionaryr r r ProxyTypesWeakValueDictionaryr WeakMethodfinalizec sD e Zd ZdZdZd ddZ fddZdd Zd d Ze j Z Z S ) r z A custom `weakref.ref` subclass which simulates a weak reference to a bound method, working around the lifetime problem of bound methods. ) _func_ref _meth_type_alive __weakref__Nc s| z|j }|j}W n& ty6 tdt|d Y n0 fdd}t| ||}t|||_t||_ d|_ t||S )Nz)argument should be a bound method, not {}c s& }|j r"d|_ d ur" | d S NF)r )argselfcallbackself_wr /usr/lib64/python3.9/weakref.py_cb6 s z WeakMethod.__new__.<locals>._cbT) __self____func__AttributeError TypeErrorformattyper __new__r r r )clsmethr objfuncr r r r r r$ / s zWeakMethod.__new__c s2 t }| }|d u s"|d u r&d S | ||S N)super__call__r r )r r' r( __class__r r r+ E s zWeakMethod.__call__c C s: t |tr6| jr|js | |u S t| |o4| j|jkS tS r) ) isinstancer r r __eq__r NotImplementedr otherr r r r/ L s zWeakMethod.__eq__c C s: t |tr6| jr|js | |uS t| |p4| j|jkS tS r) )r. r r r __ne__r r0 r1 r r r r3 S s zWeakMethod.__ne__)N) __name__ __module__ __qualname____doc__ __slots__r$ r+ r/ r3 r __hash__ __classcell__r r r, r r ' s r c @ s e Zd ZdZd2ddZefddZdd Zd d Zd d Z d d Z dd Z dd Z dd Z e Zdd Zd3ddZdd Zd d ZeZd d Zd d! Zd"d# Zd$d% Zd4d&d'Zd5d(d)Zd*d+ Zd,d- Zd.d/ Z d0d1 Z dS )6r zMapping class that references values weakly. Entries in the dictionary will be discarded when no strong reference to the value exists anymore r c K sB t | tfdd}|| _g | _t | _i | _| j|fi | d S )Nc S s6 | }|d ur2|j r$|j| j n||j| j d S r) ) _iterating_pending_removalsappendkeydata)wrselfref_atomic_removalr r r r removej s z,WeakValueDictionary.__init__.<locals>.remove)r r _remover< setr; r? update)r r2 kwrC r r r __init__i s z WeakValueDictionary.__init__c C s> | j j}| j}z | }W n ty, Y d S 0 ||| qd S r) )r< popr? IndexError)r rB rI dr> r r r _commit_removalsz s z$WeakValueDictionary._commit_removalsc C s4 | j r| | j| }|d u r,t|n|S d S r) r< rL r? KeyErrorr r> or r r __getitem__ s z WeakValueDictionary.__getitem__c C s | j r| | j|= d S r) )r< rL r? r r> r r r __delitem__ s z WeakValueDictionary.__delitem__c C s | j r| t| jS r) )r< rL lenr? r r r r __len__ s zWeakValueDictionary.__len__c C s< | j r| z| j| }W n ty2 Y dS 0 |d uS r rM rO r r r __contains__ s z WeakValueDictionary.__contains__c C s d| j jt| f S Nz <%s at %#x>r- r4 idrU r r r __repr__ s z WeakValueDictionary.__repr__c C s& | j r| t|| j|| j|< d S r) )r< rL KeyedRefrD r? r r> valuer r r __setitem__ s z WeakValueDictionary.__setitem__c C sj | j r| t }t| : | j D ] \}}| }|d ur(|||< q(W d n1 s\0 Y |S r) )r< rL r r r? items)r newr> r@ rP r r r copy s (zWeakValueDictionary.copyc C s~ ddl m} | jr| | }t| @ | j D ]$\}}| }|d ur6|||||< q6W d n1 sp0 Y |S Nr )deepcopy)rb rd r< rL r- r r? r` )r memord ra r> r@ rP r r r __deepcopy__ s .z WeakValueDictionary.__deepcopy__Nc C sN | j r| z| j| }W n ty2 | Y S 0 | }|d u rF|S |S d S r) rM )r r> defaultr@ rP r r r get s zWeakValueDictionary.getc c sf | j r| t| < | j D ] \}}| }|d ur"||fV q"W d n1 sX0 Y d S r) r< rL r r? r` )r kr@ vr r r r` s zWeakValueDictionary.itemsc c s^ | j r| t| 4 | j D ]\}}| d ur"|V q"W d n1 sP0 Y d S r) ri )r rj r@ r r r keys s zWeakValueDictionary.keysc c sJ | j r| t| | j E dH W d n1 s<0 Y dS )a Return an iterator that yields the weak references to the values. 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 values around longer than needed. Nr< rL r r? valuesrU r r r itervaluerefs s z!WeakValueDictionary.itervaluerefsc c s^ | j r| t| 4 | j D ]}| }|d ur"|V q"W d n1 sP0 Y d S r) rm r r@ r' r r r rn s zWeakValueDictionary.valuesc C s8 | j r| | j \}}| }|d ur||fS qd S r) )r< rL r? popitem)r r> r@ rP r r r rq s zWeakValueDictionary.popitemc G s^ | j r| z| j| }W n ty6 d }Y n0 |d u rV|rL|d S t|n|S d S )Nr )r< rL r? rI rN )r r> argsrP r r r rI s zWeakValueDictionary.popc C s^ z| j | }W n ty& d }Y n0 |d u rV| jr>| t|| j|| j |< |S |S d S r) )r? rN r< rL r\ rD )r r> rg rP r r r setdefault s z WeakValueDictionary.setdefaultc K sz | j r| | j}|d urRt|ds.t|}| D ]\}}t|| j|||< q6| D ]\}}t|| j|||< qZd S Nr` )r< rL r? hasattrdictr` r\ rD )r r2 kwargsrK r> rP r r r rF " s zWeakValueDictionary.updatec C s | j r| t| j S )a~ Return a list of weak references to the values. 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 values around longer than needed. )r< rL listr? rn rU r r r valuerefs. s z WeakValueDictionary.valuerefsc C s | | | S r) rF r1 r r r __ior__< s zWeakValueDictionary.__ior__c C s& t |tjr"| }|| |S tS r) r. _collections_abcMappingrb rF r0 r r2 cr r r __or__@ s zWeakValueDictionary.__or__c C s0 t |tjr,| }|| || |S tS r) r. r} r~ r- rF r0 r r r r __ror__G s zWeakValueDictionary.__ror__)r )N)N)N) r4 r5 r6 r7 rH r rL rQ rS rV rW r[ r_ rb __copy__rf rh r` rl __iter__ro rn rq rI rs rF ry r{ r r r r r r r ] s4 r c s, e Zd ZdZdZdd Z fddZ ZS )r\ a[ Specialized reference that includes a key corresponding to the value. This is used in the WeakValueDictionary to avoid having to create 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. r> c C s t | ||}||_|S r) )r r$ r> )r# obr r> r r r r r$ \ s zKeyedRef.__new__c s t || d S r) )r* rH )r r r r> r, r r rH a s zKeyedRef.__init__)r4 r5 r6 r7 r8 r$ rH r: r r r, r r\ P s r\ c @ s e Zd ZdZd1ddZdd Zdd Zd d Zd d Zd d Z dd Z dd Z dd Z e Z dd Zd2ddZdd Zdd Zd d ZeZd d Zd!d" Zd#d$ Zd%d& Zd3d'd(Zd4d)d*Zd+d, Zd-d. Zd/d0 Z dS )5r a Mapping class that references keys weakly. Entries in the dictionary will be discarded when there is no 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. Nc C sF i | _ t| fdd}|| _g | _t | _d| _|d urB| | d S )Nc S sF | }|d urB|j r"|j| n z |j| = W n ty@ Y n0 d S r) )r; r< r= r? rN )rj rA r r r r rC r s z*WeakKeyDictionary.__init__.<locals>.removeF)r? r rD r< rE r; _dirty_lenrF )r rv rC r r r rH p s zWeakKeyDictionary.__init__c C sR | j j}| j}z | }W n ty, Y d S 0 z ||= W q tyJ Y q0 qd S r) )r< rI r? rJ rN )r rI rK r> r r r rL s z"WeakKeyDictionary._commit_removalsc s& | j fdd| jD | _d| _d S )Nc s g | ]}| v r|qS r r ).0rj rK r r <listcomp> z5WeakKeyDictionary._scrub_removals.<locals>.<listcomp>F)r? r< r rU r r r _scrub_removals s z!WeakKeyDictionary._scrub_removalsc C s d| _ | jt|= d S NT)r r? r rR r r r rS s z WeakKeyDictionary.__delitem__c C s | j t| S r) )r? r rR r r r rQ s z WeakKeyDictionary.__getitem__c C s( | j r| jr| t| jt| j S r) )r r< r rT r? rU r r r rV s zWeakKeyDictionary.__len__c C s d| j jt| f S rX rY rU r r r r[ s zWeakKeyDictionary.__repr__c C s || j t|| j< d S r) )r? r rD r] r r r r_ s z WeakKeyDictionary.__setitem__c C s\ t }t| : | j D ] \}}| }|d ur|||< qW d n1 sN0 Y |S r) )r r r? r` )r ra r> r^ rP r r r rb s (zWeakKeyDictionary.copyc C sp ddl m} | }t| @ | j D ]$\}}| }|d ur(|||||< q(W d n1 sb0 Y |S rc )rb rd r- r r? r` )r re rd ra r> r^ rP r r r rf s .z WeakKeyDictionary.__deepcopy__c C s | j t||S r) )r? rh r r r> rg r r r rh s zWeakKeyDictionary.getc C s, z t |}W n ty Y dS 0 || jv S r )r r! r? )r r> r@ r r r rW s z WeakKeyDictionary.__contains__c c sX t | < | j D ] \}}| }|d ur||fV qW d n1 sJ0 Y d S r) r r? r` )r r@ r^ r> r r r r` s zWeakKeyDictionary.itemsc c sL t | 0 | jD ]}| }|d ur|V qW d n1 s>0 Y d S r) )r r? rp r r r rl s zWeakKeyDictionary.keysc c sP t | 4 | j D ]\}}| d ur|V qW d n1 sB0 Y d S r) r )r r@ r^ r r r rn s zWeakKeyDictionary.valuesc C s t | jS )az Return a list of weak references to the keys. The references are not guaranteed to be 'live' at the time they are used, so the result of calling the references needs to be checked before being used. This can be used to avoid creating references that will cause the garbage collector to keep the keys around longer than needed. )rx r? rU r r r keyrefs s zWeakKeyDictionary.keyrefsc C s0 d| _ | j \}}| }|d ur||fS qd S r )r r? rq )r r> r^ rP r r r rq s zWeakKeyDictionary.popitemc G s d| _ | jjt|g|R S r )r r? rI r )r r> rr r r r rI s zWeakKeyDictionary.popc C s | j t|| j|S r) )r? rs r rD r r r r rs s z WeakKeyDictionary.setdefaultc K s\ | j }|d urFt|ds$ti |}| D ]\}}||t|| j< q,t|rX| | d S rt )r? ru r# r` r rD rT rF )r rv rw rK r> r^ r r r rF s zWeakKeyDictionary.updatec C s | | | S r) rz r1 r r r r{ s zWeakKeyDictionary.__ior__c C s& t |tjr"| }|| |S tS r) r| r r r r r s zWeakKeyDictionary.__or__c C s0 t |tjr,| }|| || |S tS r) r r r r r r s zWeakKeyDictionary.__ror__)N)N)N)N) r4 r5 r6 r7 rH rL r rS rQ rV r[ r_ rb r rf rh rW r` rl r rn r rq rI rs rF r{ r r r r r r r e s4 r c @ s e Zd ZdZdZi ZdZe Z dZ dZ G dd dZ dd Z dd d Zd d Zd d 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. r Fc @ s e Zd ZdZdS )zfinalize._Info)weakrefr( rr rw atexitindexN)r4 r5 r6 r8 r r r r _Info6 s r c O sp | j s dd l}|| j dt_ | }t|| |_||_||_ |pFd |_ d|_t | j |_ || j| < dt_d S )Nr T)_registered_with_atexitr register _exitfuncr r r r r( rr rw next _index_iterr _registry_dirty)r r' r( rr rw r infor r r rH 9 s zfinalize.__init__Nc C s4 | j | d}|r0| js0|j|ji |jp*i S dS )zZIf alive then mark as dead and return func(*args, **kwargs); otherwise return NoneN)r rI _shutdownr( rr rw )r _r r r r r+ J s zfinalize.__call__c C sH | j | }|o| }|durD| j | drD||j|j|jp@i fS dS )z^If alive then mark as dead and return (obj, func, args, kwargs); otherwise return NoneN)r rh r rI r( rr rw r r r' r r r detachQ s zfinalize.detachc C s: | j | }|o| }|dur6||j|j|jp2i fS dS )zMIf alive then return (obj, func, args, kwargs); otherwise return NoneN)r rh r r( rr rw r r r r peekY s z finalize.peekc C s | | j v S )zWhether finalizer is alive)r rU r r r alivea s zfinalize.alivec C s | j | }t|o|jS )z*Whether finalizer should be called at exitr rh boolr )r r r r r r f s zfinalize.atexitc C s | j | }|rt||_d S r) r )r r^ r r r r r l s c C s^ | j | }|o| }|d u r6dt| jt| f S dt| jt| t|jt|f S d S )Nz<%s object at %#x; dead>z!<%s object at %#x; for %r at %#x>)r rh r r# r4 rZ r r r r r[ r s zfinalize.__repr__c C s2 dd | j D }|jdd d dd |D S )Nc S s g | ]\}}|j r||fqS r )r r fir r r r ~ r z-finalize._select_for_exit.<locals>.<listcomp>c S s | d j S )N )r )itemr r r <lambda> r z+finalize._select_for_exit.<locals>.<lambda>r c S s g | ] \}}|qS r r r r r r r r )r r` sort)r% Lr r r _select_for_exit{ s zfinalize._select_for_exitc C s d}z| j rdd l}| r(d}| d }|d u s:tjrH| }dt_|sNq| }z | W n ty t j t Y n0 || j vs,J q,W dt_ |r| ndt_ |r| 0 d S )NFr T)r gc isenableddisabler r r rI Exceptionsys excepthookexc_infor enable)r% reenable_gcr pendingr r r r r s2 zfinalize._exitfunc)N)r4 r5 r6 r7 r8 r r itertoolscountr r r r rH r+ r r propertyr r setterr[ classmethodr r r r r r r s. r )r7 _weakrefr r r r r r r r _weakrefsetr r r} r r r __all__Setr MutableSetr MutableMappingr r\ r r r r r r <module> s ( 6 t 9