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r r s r c @ s e Zd ZdZdS )r aC Subclass of ValueError raised by TopologicalSorter.prepare if cycles
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element in the *args* attribute of the exception instance and consists in a list
of nodes, such that each node is, in the graph, an immediate predecessor of the
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_get_nodeinfo4 s z TopologicalSorter._get_nodeinfoc G sR | j dur td��| �|�}| jt|�7 _|D ]
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�zTopologicalSorter.addc C sB | j dur td��dd� | j�� D �| _ | �� }|r td|��dS )ax Mark the graph as finished and check for cycles in the graph.
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�zTopologicalSorter.preparec C sV | j du r td��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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zTopologicalSorter.get_readyc C s( | j du r td��| j| jk pt| j �S )a� Return ``True`` if more progress can be made and ``False`` otherwise.
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7 _ qdS ) a� Marks a set of nodes returned by "get_ready" as processed.
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processed by a previous call to this method, if a node was not added to the
graph by using "add" or if called without calling "prepare" previously or if
node has not yet been returned by "get_ready".
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���z TopologicalSorter._find_cyclec c s> � | � � | �� r | �� }|E dH | j|� | �� s dS dS )aQ Returns an iterable of nodes in a topological order.
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cycle is detected, :exc:`CycleError` will be raised.
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