45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
class DummyNode:
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name = "Dummy"
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def __init__(self, children=None, parents=None):
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self.children = children if children is not None else []
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self.parents = parents if parents is not None else []
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def traverse(node_in, node_out, nodes=None, dummy_mode=False):
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# i have no idea if this is any algorithm in particular.
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nodes = nodes if nodes is not None else []
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seen_up = {}
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q = [node_out]
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while len(q) > 0:
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node = q.pop(0)
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seen_up[node] = True
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for parent in node.parents:
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q.append(parent)
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if dummy_mode:
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seen_up[node_in] = True
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nodes = []
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q = [node_in]
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while len(q) > 0:
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node = q.pop(0)
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if not seen_up[node]:
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continue
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parents_added = (parent in nodes for parent in node.parents)
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if node not in nodes and all(parents_added):
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nodes.append(node)
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for child in node.children:
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q.append(child)
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if dummy_mode:
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nodes.remove(node_in)
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return nodes
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def traverse_all(nodes_in, nodes_out, nodes=None):
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all_in = DummyNode(children=nodes_in)
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all_out = DummyNode(parents=nodes_out)
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return traverse(all_in, all_out, nodes, dummy_mode=True)
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