o }e#@sTdZddlZddlZddlZddlZedZedZd ddZGdddZ dS) z-Refactored 'safe reference from dispatcher.pyN__self____func__cCszt|}Wnty t|rt||YSt|YSw|dur?t|ds7t|ds7Jd|dt||d}|SdS)aReturn a *safe* weak reference to a callable target. - ``target``: The object to be weakly referenced, if it's a bound method reference, will create a BoundMethodWeakref, otherwise creates a simple weakref. - ``on_delete``: If provided, will have a hard reference stored to the callable to be called after the safe reference goes out of scope with the reference object, (either a weakref or a BoundMethodWeakref) as argument. Nim_funcrzsafe_ref target z@ has im_self, but no im_func, don't know how to create reference)target on_delete)get_selfAttributeErrorcallableweakrefrefhasattrBoundMethodWeakref)rrim_self referencerY/Users/abhinavbhinder/Documents/map/venv/lib/python3.10/site-packages/blinker/_saferef.pysafe_ref.s    rcsleZdZdZeZdfdd ZdddZe ddZ d d Z e Z d d Z d dZddZddZZS)r a'Safe' and reusable weak references to instance methods. BoundMethodWeakref objects provide a mechanism for referencing a bound method without requiring that the method object itself (which is normally a transient object) is kept alive. Instead, the BoundMethodWeakref object keeps weak references to both the object and the function which together define the instance method. Attributes: - ``key``: The identity key for the reference, calculated by the class's calculate_key method applied to the target instance method. - ``deletion_methods``: Sequence of callable objects taking single argument, a reference to this object which will be called when *either* the target object or target function is garbage collected (i.e. when this object becomes invalid). These are specified as the on_delete parameters of safe_ref calls. - ``weak_self``: Weak reference to the target object. - ``weak_func``: Weak reference to the target function. Class Attributes: - ``_all_instances``: Class attribute pointing to all live BoundMethodWeakref objects indexed by the class's calculate_key(target) method applied to the target objects. This weak value dictionary is used to short-circuit creation so that multiple references to the same (object, function) pair produce the same BoundMethodWeakref instance. Ncsb||}|j|}|dur|j||St|}||j|<|j||g|Ri||S)aCreate new instance or return current instance. Basically this method of construction allows us to short-circuit creation of references to already-referenced instance methods. The key corresponding to the target is calculated, and if there is already an existing reference, that is returned, with its deletion_methods attribute updated. Otherwise the new instance is created and registered in the table of already-referenced methods. N) calculate_key_all_instancesgetdeletion_methodsappendsuper__new____init__)clsrr argumentsnamedkeycurrentbase __class__rrrqs    zBoundMethodWeakref.__new__cCsf|fdd}|g|_|||_t|}t|}t|||_t|||_t ||_ t |j |_ dS)aReturn a weak-reference-like instance for a bound method. - ``target``: The instance-method target for the weak reference, must have im_self and im_func attributes and be reconstructable via the following, which is true of built-in instance methods:: target.im_func.__get__( target.im_self ) - ``on_delete``: Optional callback which will be called when this weak reference ceases to be valid (i.e. either the object or the function is garbage collected). Should take a single argument, which will be passed a pointer to this object. cSs|jdd}|jdd=z|jj|j=Wn tyYnw|D]8}z t|r,||Wq!tyYztWnt yVt d}t d|d|d|YnwYq!wdS)z=Set self.isDead to True when method or instance is destroyed.NzException during saferef z cleanup function z: ) rr"rrKeyErrorr Exception traceback print_excrsysexc_infoprint)Zweakselfmethodsfunctionerrrremoves8      z+BoundMethodWeakref.__init__..removeN) rrrrget_funcr r weak_self weak_funcstr self_name__name__ func_name)r+rrr/rrrrrrs   zBoundMethodWeakref.__init__cCstt|tt|fS)zCalculate the reference key for this reference. Currently this is a two-tuple of the id()'s of the target object and the target function respectively. )idrr0)rrrrrrsz BoundMethodWeakref.calculate_keycCsd|jj|j|jS)z-Give a friendly representation of the object.z {}({}.{}))formatr"r5r4r6r+rrr__str__s zBoundMethodWeakref.__str__cCst|j|jfSN)hashr4rr9rrr__hash__szBoundMethodWeakref.__hash__cCs |duS)z'Whether we are still a valid reference.Nrr9rrr __nonzero__s zBoundMethodWeakref.__nonzero__cCs.t||jst|jt|St|j|jS)zCompare with another reference.) isinstancer"operatoreqtyper)r+otherrrr__eq__s zBoundMethodWeakref.__eq__cCs.|}|dur|}|dur||SdS)a?Return a strong reference to the bound method. If the target cannot be retrieved, then will return None, otherwise returns a bound instance method for our object and function. Note: You may call this method any number of times, as it does not invalidate the reference. N)r1r2__get__)r+rr-rrr__call__s   zBoundMethodWeakref.__call__r;)r5 __module__ __qualname____doc__r WeakValueDictionaryrrr classmethodrr:__repr__r=r>rDrF __classcell__rrr!rr Ms! 0 r r;) rIr@r(r&r attrgetterrr0rr rrrrs"