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_get_nodeinfo4 s z TopologicalSorter._get_nodeinfoc G sR | j durtd��| �|�}| jt|�7 _|D ]}| �|�}|j�|� q2dS )a� Add a new node and its predecessors to the graph.
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�zTopologicalSorter.preparec C sV | j du rtd��t| j �}| j}|D ]}t|| _q&| j �� | jt|�7 _|S )a� Return a tuple of all the nodes that are ready.
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z TopologicalSorter._find_cyclec c s2 | � � | �� r.| �� }|E dH | j|� qdS )aQ Returns an iterable of nodes in a topological order.
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