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3
Reเ  ใ               @   s   G d d de ZdS )c               @   sp   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dd Zdd Zdd ZdS )ฺDirectedGraphz+A graph structure with directed edges.
    c             C   s   t  | _i | _i | _d S )N)ฺsetฺ	_verticesฺ	_forwardsฺ
_backwards)ฺselfฉ r   ๚/builddir/build/BUILDROOT/alt-python36-pip-20.2.4-5.el8.x86_64/opt/alt/python36/lib/python3.6/site-packages/pip/_vendor/resolvelib/structs.pyฺ__init__   s    zDirectedGraph.__init__c             C   s
   t | jS )N)ฺiterr   )r   r   r   r   ฺ__iter__
   s    zDirectedGraph.__iter__c             C   s
   t | jS )N)ฺlenr   )r   r   r   r   ฺ__len__   s    zDirectedGraph.__len__c             C   s
   || j kS )N)r   )r   ฺkeyr   r   r   ฺ__contains__   s    zDirectedGraph.__contains__c             C   sB   t  }t| j|_dd | jj D |_dd | jj D |_|S )z-Return a shallow copy of this graph.
        c             S   s   i | ]\}}t ||qS r   )r   )ฺ.0ฺkฺvr   r   r   ๚
<dictcomp>   s    z&DirectedGraph.copy.<locals>.<dictcomp>c             S   s   i | ]\}}t ||qS r   )r   )r   r   r   r   r   r   r      s    )r   r   r   r   ฺitemsr   )r   ฺotherr   r   r   ฺcopy   s
    zDirectedGraph.copyc             C   s:   || j krtd| j j| t | j|< t | j|< dS )z'Add a new vertex to the graph.
        zvertex existsN)r   ฺ
ValueErrorฺaddr   r   r   )r   r   r   r   r   r      s
    
zDirectedGraph.addc             C   s\   | j j| x$| jj|D ]}| j| j| qW x$| jj|D ]}| j| j| q@W dS )zLRemove a vertex from the graph, disconnecting all edges from/to it.
        N)r   ฺremover   ฺpopr   )r   r   ฺfฺtr   r   r   r   %   s
    zDirectedGraph.removec             C   s   || j | ko|| j| kS )N)r   r   )r   r   r   r   r   r   ฺ	connected.   s    zDirectedGraph.connectedc             C   s6   || j krt|| j| j| | j| j| dS )zgConnect two existing vertices.

        Nothing happens if the vertices are already connected.
        N)r   ฺKeyErrorr   r   r   )r   r   r   r   r   r   ฺconnect1   s    
zDirectedGraph.connectc             c   s4   x.| j j D ] \}}x|D ]}||fV  qW qW d S )N)r   r   )r   r   ฺchildrenr   r   r   r   ฺ
iter_edges;   s    
zDirectedGraph.iter_edgesc             C   s   t | j| S )N)r
   r   )r   r   r   r   r   ฺiter_children@   s    zDirectedGraph.iter_childrenc             C   s   t | j| S )N)r
   r   )r   r   r   r   r   ฺiter_parentsC   s    zDirectedGraph.iter_parentsN)ฺ__name__ฺ
__module__ฺ__qualname__ฺ__doc__r	   r   r   r   r   r   r   r   r   r!   r"   r#   r   r   r   r   r      s   			
r   N)ฺobjectr   r   r   r   r   ฺ<module>   s    