D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
usr
/
lib
/
python3
/
dist-packages
/
blinker
/
__pycache__
/
Filename :
_saferef.cpython-312.pyc
back
Copy
� �]ue�# � � � d Z ddlZddlZddlZddlZ ej d� Z ej d� Zdd�Z G d� d� Z y) z-Refactored 'safe reference from dispatcher.py� N�__self__�__func__c � � t | � }|�2t | d� st | d� s J d| �d�� �t | |�� }|S y# t $ r; t |� rt j | |� cY S t j | � cY S w xY w)a� Return 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. N�im_funcr zsafe_ref target z@ has im_self, but no im_func, don't know how to create reference)�target� on_delete)�get_self�hasattr�BoundMethodWeakref�AttributeError�callable�weakref�ref)r r �im_self� references �2/usr/lib/python3/dist-packages/blinker/_saferef.py�safe_refr . s� � � ��6�"�� � � �6�9�-����1L� �"�6�*� -5� 5� �L� +�&�I�N�I� � � �� � '� �I� ��;�;�v�y�1� 1��;�;�v�&� &� '�s � A �*B�.B�Bc � � � e Zd ZdZ ej � Zd � fd� Zd d�Ze d� � Z d� Z e Z d� Z d� Zd� Zd � Z� xZS ) 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. c � �� | j |� }| j j |� }|� |j j |� |S t �| � | � }|| j |< |j ||g|��i |�� |S )a� Create 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. )� calculate_key�_all_instances�get�deletion_methods�append�super�__new__�__init__) �clsr r � arguments�named�key�current�base� __class__s �r r zBoundMethodWeakref.__new__q s� �� � � � ��'���$�$�(�(��-�� � � � $� $� +� +�I� 6��N��7�?�3�'�D�&*�C� � �s� #� �D�M�M�&�)� A�i� A�5� A��K� c �6 � | fd�}|g| _ | j |� | _ t |� }t |� }t j ||� | _ t j ||� | _ t |� | _ t |j � | _ y)a� Return 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. c � � |j dd }|j dd�= |j j |j = |D ] } t |� r ||� � y# t $ r Y �'w xY w# t $ rS t j � n:# t $ r. t j � d }t d|� d|� d|� �� Y nw xY wY ��w xY w)z=Set self.isDead to True when method or instance is destroyed.N� zException during saferef z cleanup function z: ) r r$ r r! �KeyErrorr � Exception� traceback� print_excr �sys�exc_info�print)�weak�self�methods�function�es r �removez+BoundMethodWeakref.__init__.<locals>.remove� s� � ��+�+�A�.�G��%�%�a�(� ��N�N�1�1�$�(�(�;� $� �� � ��)� ���� �� � �� �� !� ��!�+�+�-��)� � �L�L�N�1� -�� � 7��v� >0�08�z��A�3� @�����sG �!A �A,� A)�(A)�, C�6B � C� 4C�?C�C�C�CN) r r r! r �get_funcr r � weak_self� weak_func�str� self_name�__name__� func_name)r1 r r r5 r r s r r zBoundMethodWeakref.__init__� s � �" #� �, "+� �� ��%�%�f�-����6�"���6�"�� ���W�f�5��� ���W�f�5��� �W� ��� �W� -� -�.��r% c �R � t t |� � t t |� � fS )z�Calculate the reference key for this reference. Currently this is a two-tuple of the id()'s of the target object and the target function respectively. )�idr r6 )r r s r r z BoundMethodWeakref.calculate_key� s# � � �8�F�#�$�b��&�)9�&:�;�;r% c �x � dj | j j | j | j � S )z-Give a friendly representation of the object.z {}({}.{}))�formatr$ r; r: r< �r1 s r �__str__zBoundMethodWeakref.__str__� s0 � ��!�!� �N�N� #� #� �N�N� �N�N� � r% c �D � t | j | j f� S �N)�hashr: r! rA s r �__hash__zBoundMethodWeakref.__hash__� s � ��T�^�^�T�X�X�.�/�/r% c � � | � duS )z'Whether we are still a valid reference.N� rA s r � __nonzero__z BoundMethodWeakref.__nonzero__� s � ��v�T�!�!r% c �� � t || j � s)t j | j t |� � S t j | j |j � S )z Compare with another reference.)� isinstancer$ �operator�eq�typer! )r1 �others r �__eq__zBoundMethodWeakref.__eq__� sB � ��%�� � �0��;�;�t�~�~�t�E�{�;� ;��{�{�4�8�8�U�Y�Y�/�/r% c �n � | j � }|�#| j � }|�|j |� S y)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)r7 r8 �__get__)r1 r r3 s r �__call__zBoundMethodWeakref.__call__� s< � � � � �!�� � ��~�~�'�H��#� �'�'��/�/�r% rD )r; � __module__� __qualname__�__doc__r �WeakValueDictionaryr r r � classmethodr rB �__repr__rF rI rP rS � __classcell__)r$ s @r r r M sZ �� � �B 1�W�0�0�2�N��,./�` �<� �<� � �H�0�"�0� r% r rD ) rV rL r- r+ r � attrgetterr r6 r r rH r% r �<module>r\ sN ��F 4� � � � � �8� � �z� *�� �8� � �z� *�� �>Y� Yr%