Fix replace_node on nodes with indirect node refs #537
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Model.replace_node failed if a node n contained a reference to another node m, when m only occurs in one of the (grand)children of n. Since replace_node used the breadth-first Model.walk method, the reference to m would be replaced before m is replaced in the (grand)children of n. However, this fails because set_ref verifies that the a new node reference occurs in the graph. This change resolves this issue by replacing nodes using a depth-first search in post-order. This amounts to doing a topological sort of the transposed graph.
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Update the existing walk method to support both breadth-first and depth-first traversal by adding an `order` argument that supports the following string values: - bfs: breadth-first traversal - dfs_pre: depth-first traversal in pre-order - dfs_post: depth-first traversal in post-order
svlandeg
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svlandeg
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Sep 22, 2021
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Model.replace_nodefailed if a node n contained a reference to another node m, when m only occurs in one of the (grand)children of n. Sincereplace_nodeused the breadth-firstModel.walkmethod, the reference to m would be replaced before m is replaced in the (grand)children of n. However, this fails becauseset_refverifies that the a new node reference occurs in the graph.This change resolves this issue by replacing nodes using a depth-first search.