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weakref.cpython-35.pyc
fK @ s" d Z d d l m Z m Z m Z m Z m Z m Z m Z d d l m Z m Z d d l Z d d l Z d d l Z e e f Z d d d d d d d d d d d d d g Z Gd d d e Z Gd d d e j Z Gd d d e Z Gd d d e j Z Gd d d Z d S)z{Weak reference support for Python. This module is an implementation of PEP 205: http://www.python.org/dev/peps/pep-0205/ )getweakrefcount getweakrefsrefproxyCallableProxyType ProxyType ReferenceType)WeakSet_IterationGuardNr r r r WeakKeyDictionaryr r r ProxyTypesWeakValueDictionaryr WeakMethodfinalizec s^ e Z d Z d Z d Z d d d Z f d d Z d d Z d d Z e j 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 y | j } | j } Wn0 t k rH t d j t | d Yn X f d d } t j | | | } t | | | _ t | | _ d | _ t | | S)Nz)argument should be a bound method, not {}c s5 } | j r1 d | _ d k r1 | d S)NF)r )argself)callbackself_wr /usr/lib/python3.5/weakref.py_cb2 s z WeakMethod.__new__.<locals>._cbT) __self____func__AttributeError TypeErrorformattyper __new__r r r )clsmethr objfuncr r r )r r r r! + s zWeakMethod.__new__c sG t j } | j } | d k s3 | d k r7 d S| j | | S)N)super__call__r r )r r$ r% ) __class__r r r' A s zWeakMethod.__call__c C sS t | t rO | j s# | j r- | | k St j | | oN | j | j k Sd S)NF) isinstancer r r __eq__r )r otherr r r r* H s "zWeakMethod.__eq__c C sS t | t rO | j s# | j r- | | k St j | | pN | j | j k Sd S)NT)r) r r r __ne__r )r r+ r r r r, O s "zWeakMethod.__ne__)z _func_refz _meth_typez_alivez __weakref__) __name__ __module__ __qualname____doc__ __slots__r! r' r* r, r __hash__r r )r( r r # s c @ s e Z d Z d Z d d Z d d Z d d Z d d Z d d Z d d Z d d Z d d Z d d Z e Z d d Z d d d Z d d Z d d Z e Z d d Z d d Z d! d" Z d# d$ Z d d% d& Z d' d( Z d) d* Z d S)+r zMapping class that references values weakly. Entries in the dictionary will be discarded when no strong reference to the value exists anymore c O s | s t d | ^ } } t | d k rF t d t | t | d d } | | _ g | _ t | _ i | _ } | j | | d S)NzGdescriptor '__init__' of 'WeakValueDictionary' object needs an argument z$expected at most 1 arguments, got %dc S sE | } | d k rA | j r4 | j j | j n | j | j =d S)N) _iterating_pending_removalsappendkeydata)wrselfrefr r r r removel s z,WeakValueDictionary.__init__.<locals>.remove) r lenr _remover5 setr4 r8 update)argskwr r; dr r r __init__e s z WeakValueDictionary.__init__c C s0 | j } | j } x | r+ | | j =q Wd S)N)r5 r8 pop)r lrB r r r _commit_removalsz s z$WeakValueDictionary._commit_removalsc C s3 | j | } | d k r+ t | n | Sd S)N)r8 KeyError)r r7 or r r __getitem__ s z WeakValueDictionary.__getitem__c C s! | j r | j | j | =d S)N)r5 rF r8 )r r7 r r r __delitem__ s z WeakValueDictionary.__delitem__c C s t | j t | j S)N)r< r8 r5 )r r r r __len__ s zWeakValueDictionary.__len__c C s7 y | j | } Wn t k r, d SYn X| d k S)NF)r8 rG )r r7 rH r r r __contains__ s z WeakValueDictionary.__contains__c C s d | j j t | f S)Nz <%s at %#x>)r( r- id)r r r r __repr__ s z WeakValueDictionary.__repr__c C s3 | j r | j t | | j | | j | <d S)N)r5 rF KeyedRefr= r8 )r r7 valuer r r __setitem__ s z WeakValueDictionary.__setitem__c C sL t } x< | j j D]+ \ } } | } | d k r | | | <q W| S)N)r r8 items)r newr7 r9 rH r r r copy s zWeakValueDictionary.copyc C sh d d l m } | j } xE | j j D]4 \ } } | } | d k r, | | | | | <q, W| S)Nr )deepcopy)rT rU r( r8 rR )r memorU rS r7 r9 rH r r r __deepcopy__ s z WeakValueDictionary.__deepcopy__Nc C sK y | j | } Wn t k r) | SYn X| } | d k rC | S| Sd S)N)r8 rG )r r7 defaultr9 rH r r r get s zWeakValueDictionary.getc c sX t | E x= | j j D], \ } } | } | d k r | | f Vq WWd QRXd S)N)r r8 rR )r kr9 vr r r rR s zWeakValueDictionary.itemsc c sL t | 9 x1 | j j D] \ } } | d k r | Vq WWd QRXd S)N)r r8 rR )r rZ r9 r r r keys s zWeakValueDictionary.keysc c s* t | | j j Ed HWd QRXd S)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. N)r r8 values)r r r r itervaluerefs s z!WeakValueDictionary.itervaluerefsc c sL t | 9 x1 | j j D] } | } | d k r | Vq WWd QRXd S)N)r r8 r] )r r9 r$ r r r r] s zWeakValueDictionary.valuesc C sR | j r | j x8 | j j \ } } | } | d k r | | f Sq Wd S)N)r5 rF r8 popitem)r r7 r9 rH r r r r_ s zWeakValueDictionary.popitemc G su | j r | j y | j j | } Wn# t k rQ | rJ | d S Yn X| d k rm t | n | Sd S)Nr )r5 rF r8 rD rG )r r7 r@ rH r r r rD s zWeakValueDictionary.popc C sd y | j | } WnE t k rX | j r4 | j t | | j | | j | <| SYn X| Sd S)N)r8 rG r5 rF rO r= )r r7 rX r9 r r r setdefault s z WeakValueDictionary.setdefaultc O s | s t d | ^ } } t | d k rF t d t | | rV | d n d } | j ro | j | j } | d k r t | d s t i | } x3 | j D]% \ } } t | | j | | | <q Wt | r | j | d S)NzEdescriptor 'update' of 'WeakValueDictionary' object needs an argumentr3 z$expected at most 1 arguments, got %dr rR ) r r< r5 rF r8 hasattrr rR rO r= r? )r@ kwargsr dictrB r7 rH r r r r? s zWeakValueDictionary.updatec C s t | j j S)a~ Return a list of weak references to the values. The references are not guaranteed to be 'live' at the time they are used, so the result of calling the references needs to be checked before being used. This can be used to avoid creating references that will cause the garbage collector to keep the values around longer than needed. )listr8 r] )r r r r valuerefs s z WeakValueDictionary.valuerefs)r- r. r/ r0 rC rF rI rJ rK rL rN rQ rT __copy__rW rY rR r\ __iter__r^ r] r_ rD r` r? re r r r r r Y s. c s: e Z d Z d Z d Z d d Z f d d Z S)rO a[ Specialized reference that includes a key corresponding to the value. This is used in the WeakValueDictionary to avoid having to create a function object for each key stored in the mapping. A shared callback object can use the 'key' attribute of a KeyedRef instead of getting a reference to the key from an enclosing scope. r7 c C s" t j | | | } | | _ | S)N)r r! r7 )r obr r7 r r r r r! 1 s zKeyedRef.__new__c s t j | | d S)N)r& rC )r rh r r7 )r( r r rC 6 s zKeyedRef.__init__)zkey)r- r. r/ r0 r1 r! rC r r )r( r rO % s rO c @ s e Z d Z d Z d d d Z d d Z d d Z d d Z d d Z d d Z d d Z d d Z d d Z e Z d d Z d d d Z d d Z d d Z d d Z e Z d d Z d! d" Z d# d$ Z d% d& Z d d' d( Z d d) d* Z d S)+r 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 sb i | _ t | d d } | | _ g | _ t | _ d | _ | d k r^ | j | d S)Nc S s? | } | d k r; | j r1 | j j | n | j | =d S)N)r4 r5 r6 r8 )rZ r: r r r r r; G s z*WeakKeyDictionary.__init__.<locals>.removeF)r8 r r= r5 r> r4 _dirty_lenr? )r rc r; r r r rC E s zWeakKeyDictionary.__init__c C sI | j } | j } x0 | rD y | | j =Wq t k r@ Yq Xq Wd S)N)r5 r8 rD rG )r rE rB r r r rF V s z"WeakKeyDictionary._commit_removalsc s5 | j f d d | j D | _ d | _ d S)Nc s" g | ] } | k r | q Sr r ).0rZ )rB r r <listcomp>e s z5WeakKeyDictionary._scrub_removals.<locals>.<listcomp>F)r8 r5 ri )r r )rB r _scrub_removalsc s z!WeakKeyDictionary._scrub_removalsc C s d | _ | j t | =d S)NT)ri r8 r )r r7 r r r rJ h s z WeakKeyDictionary.__delitem__c C s | j t | S)N)r8 r )r r7 r r r rI l s z WeakKeyDictionary.__getitem__c C s6 | j r | j r | j t | j t | j S)N)ri r5 rl r< r8 )r r r r rK o s zWeakKeyDictionary.__len__c C s d | j j t | f S)Nz <%s at %#x>)r( r- rM )r r r r rN v s zWeakKeyDictionary.__repr__c C s | | j t | | j <d S)N)r8 r r= )r r7 rP r r r rQ y s z WeakKeyDictionary.__setitem__c C sL t } x< | j j D]+ \ } } | } | d k r | | | <q W| S)N)r r8 rR )r rS r7 rP rH r r r rT | s zWeakKeyDictionary.copyc C sh d d l m } | j } xE | j j D]4 \ } } | } | d k r, | | | | | <q, W| S)Nr )rU )rT rU r( r8 rR )r rV rU rS r7 rP rH r r r rW s z WeakKeyDictionary.__deepcopy__c C s | j j t | | S)N)r8 rY r )r r7 rX r r r rY s zWeakKeyDictionary.getc C s6 y t | } Wn t k r( d SYn X| | j k S)NF)r r r8 )r r7 r9 r r r rL s z WeakKeyDictionary.__contains__c c sX t | E x= | j j D], \ } } | } | d k r | | f Vq WWd QRXd S)N)r r8 rR )r r9 rP r7 r r r rR s zWeakKeyDictionary.itemsc c sF t | 3 x+ | j D] } | } | d k r | Vq WWd QRXd S)N)r r8 )r r9 r$ r r r r\ s zWeakKeyDictionary.keysc c sL t | 9 x1 | j j D] \ } } | d k r | Vq WWd QRXd S)N)r r8 rR )r r9 rP r r r r] s zWeakKeyDictionary.valuesc C s t | j S)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. )rd r8 )r r r r keyrefs s zWeakKeyDictionary.keyrefsc C sH d | _ x8 | j j \ } } | } | d k r | | f Sq Wd S)NT)ri r8 r_ )r r7 rP rH r r r r_ s zWeakKeyDictionary.popitemc G s" d | _ | j j t | | S)NT)ri r8 rD r )r r7 r@ r r r rD s zWeakKeyDictionary.popc C s | j j t | | j | S)N)r8 r` r r= )r r7 rX r r r r` s z WeakKeyDictionary.setdefaultc K s | j } | d k ri t | d s6 t i | } x0 | j D]" \ } } | | t | | j <qC Wt | r | j | d S)NrR )r8 ra r rR r r= r< r? )r rc rb rB r7 rP r r r r? s zWeakKeyDictionary.update)r- r. r/ r0 rC rF rl rJ rI rK rN rQ rT rf rW rY rL rR r\ rg r] rm r_ rD r` r? r r r r r : s. c @ s e Z d Z d Z f Z i Z d Z e j Z d Z d Z Gd d d Z d d Z d d d Z d d Z d d Z e d d Z e d d Z e j d d Z d d Z e d d Z e d d Z d S)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 Z d Z d Z d S) zfinalize._Infoweakrefr% r@ rb atexitindexN)zweakrefzfunczargszkwargszatexitzindex)r- r. r/ r1 r r r r _Info s rq c O s | j s. d d l } | j | j d t _ | j } t | | | _ | | _ | | _ | pg d | _ d | _ t | j | _ | | j | <d t _ d S)Nr T)_registered_with_atexitro register _exitfuncr rq r rn r% r@ rb next _index_iterrp _registry_dirty)r r$ r% r@ rb ro infor r r rC s zfinalize.__init__Nc C sE | j j | d } | rA | j rA | j | j | j p= i Sd S)zZIf alive then mark as dead and return func(*args, **kwargs); otherwise return NoneN)rw rD _shutdownr% r@ rb )r _ry r r r r' s zfinalize.__call__c C sh | j j | } | o! | j } | d k rd | j j | d rd | | j | j | j p` i f Sd S)z^If alive then mark as dead and return (obj, func, args, kwargs); otherwise return NoneN)rw rY rn rD r% r@ rb )r ry r$ r r r detach s !zfinalize.detachc C sS | j j | } | o! | j } | d k rO | | j | j | j pK i f Sd S)zMIf alive then return (obj, func, args, kwargs); otherwise return NoneN)rw rY rn r% r@ rb )r ry r$ r r r peek s z finalize.peekc C s | | j k S)zWhether finalizer is alive)rw )r r r r alive s zfinalize.alivec C s% | j j | } t | o$ | j S)z*Whether finalizer should be called at exit)rw rY boolro )r ry r r r ro s zfinalize.atexitc C s+ | j j | } | r' t | | _ d S)N)rw rY r ro )r rP ry r r r ro $ s c C s | j j | } | o! | j } | d k rM d t | j t | f Sd t | j t | t | j t | f Sd S)Nz<%s object at %#x; dead>z!<%s object at %#x; for %r at %#x>)rw rY rn r r- rM )r ry r$ r r r rN * s zfinalize.__repr__c C sC d d | j j D } | j d d d d d | D S)Nc S s+ g | ]! \ } } | j r | | f q Sr )ro )rj fir r r rk 6 s z-finalize._select_for_exit.<locals>.<listcomp>r7 c S s | d j S)Nr3 )rp )itemr r r <lambda>7 s z+finalize._select_for_exit.<locals>.<lambda>c S s g | ] \ } } | q Sr r )rj r r r r r rk 8 s )rw rR sort)r" Lr r r _select_for_exit3 s zfinalize._select_for_exitc C s d } z | j r d d l } | j r: d } | j d } x | d k sX t j rm | j } d t _ | st P| j } y | Wn% t k r t j t j Yn X| | j k sC t qC WWd d t _ | r | j Xd S)NFr T)rw gc isenableddisabler rx r rD Exceptionsys excepthookexc_infoAssertionErrorrz enable)r" reenable_gcr pendingr r r r rt : s. zfinalize._exitfunc)r- r. r/ r0 r1 rw rz itertoolscountrv rx rr rq rC r' r| r} propertyr~ ro setterrN classmethodr rt r r r r r s$ )r0 _weakrefr r r r r r r _weakrefsetr r collectionsr r r __all__r MutableMappingr rO r r r r r r <module> s 4 6