Edit File: structs.cpython-37.pyc
B �j�c� � @ s G d d� de �ZdS )c @ sp e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dd� Z dd� Zdd� ZdS )� DirectedGraphz+A graph structure with directed edges. c C s t � | _i | _i | _d S )N)�set� _vertices� _forwards� _backwards)�self� r ��/builddir/build/BUILDROOT/alt-python37-pip-20.2.4-5.el8.x86_64/opt/alt/python37/lib/python3.7/site-packages/pip/_vendor/resolvelib/structs.py�__init__ s zDirectedGraph.__init__c C s t | j�S )N)�iterr )r r r r �__iter__ s zDirectedGraph.__iter__c C s t | j�S )N)�lenr )r r r r �__len__ s zDirectedGraph.__len__c C s || j kS )N)r )r �keyr r r � __contains__ s zDirectedGraph.__contains__c C sB t � }t| j�|_dd� | j�� D �|_dd� | j�� D �|_|S )z-Return a shallow copy of this graph. c S s i | ]\}}t |�|�qS r )r )�.0�k�vr r r � <dictcomp> s z&DirectedGraph.copy.<locals>.<dictcomp>c S s i | ]\}}t |�|�qS r )r )r r r r r r r s )r r r r �itemsr )r �otherr r r �copy s zDirectedGraph.copyc C s: || j krtd��| j �|� t� | j|< t� | j|< dS )z'Add a new vertex to the graph. z vertex existsN)r � ValueError�addr r r )r r r r r r s zDirectedGraph.addc C s\ | j �|� x$| j�|�D ]}| j| �|� qW x$| j�|�D ]}| j| �|� q@W dS )zLRemove a vertex from the graph, disconnecting all edges from/to it. N)r �remover �popr )r r �f�tr r r r % s zDirectedGraph.removec C s || j | ko|| j| kS )N)r r )r r r r r r � connected. s zDirectedGraph.connectedc C s6 || j krt|��| j| �|� | j| �|� dS )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 zDirectedGraph.connectc c s4 x.| j �� D ] \}}x|D ]}||fV qW q W d S )N)r r )r r �childrenr r r r � iter_edges; s zDirectedGraph.iter_edgesc C s t | j| �S )N)r r )r r r r r � iter_children@ s zDirectedGraph.iter_childrenc C s t | j| �S )N)r r )r r r r r � iter_parentsC s zDirectedGraph.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> �