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node_modules/dagre-d3-es/src/dagre/order/build-layer-graph.js

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+import * as _ from 'lodash-es';
+import { Graph } from '../../graphlib/index.js';
+
+export { buildLayerGraph };
+
+/*
+ * Constructs a graph that can be used to sort a layer of nodes. The graph will
+ * contain all base and subgraph nodes from the request layer in their original
+ * hierarchy and any edges that are incident on these nodes and are of the type
+ * requested by the "relationship" parameter.
+ *
+ * Nodes from the requested rank that do not have parents are assigned a root
+ * node in the output graph, which is set in the root graph attribute. This
+ * makes it easy to walk the hierarchy of movable nodes during ordering.
+ *
+ * Pre-conditions:
+ *
+ *    1. Input graph is a DAG
+ *    2. Base nodes in the input graph have a rank attribute
+ *    3. Subgraph nodes in the input graph has minRank and maxRank attributes
+ *    4. Edges have an assigned weight
+ *
+ * Post-conditions:
+ *
+ *    1. Output graph has all nodes in the movable rank with preserved
+ *       hierarchy.
+ *    2. Root nodes in the movable layer are made children of the node
+ *       indicated by the root attribute of the graph.
+ *    3. Non-movable nodes incident on movable nodes, selected by the
+ *       relationship parameter, are included in the graph (without hierarchy).
+ *    4. Edges incident on movable nodes, selected by the relationship
+ *       parameter, are added to the output graph.
+ *    5. The weights for copied edges are aggregated as need, since the output
+ *       graph is not a multi-graph.
+ */
+function buildLayerGraph(g, rank, relationship) {
+  var root = createRootNode(g),
+    result = new Graph({ compound: true })
+      .setGraph({ root: root })
+      .setDefaultNodeLabel(function (v) {
+        return g.node(v);
+      });
+
+  _.forEach(g.nodes(), function (v) {
+    var node = g.node(v),
+      parent = g.parent(v);
+
+    if (node.rank === rank || (node.minRank <= rank && rank <= node.maxRank)) {
+      result.setNode(v);
+      result.setParent(v, parent || root);
+
+      // This assumes we have only short edges!
+      _.forEach(g[relationship](v), function (e) {
+        var u = e.v === v ? e.w : e.v,
+          edge = result.edge(u, v),
+          weight = !_.isUndefined(edge) ? edge.weight : 0;
+        result.setEdge(u, v, { weight: g.edge(e).weight + weight });
+      });
+
+      if (_.has(node, 'minRank')) {
+        result.setNode(v, {
+          borderLeft: node.borderLeft[rank],
+          borderRight: node.borderRight[rank],
+        });
+      }
+    }
+  });
+
+  return result;
+}
+
+function createRootNode(g) {
+  var v;
+  while (g.hasNode((v = _.uniqueId('_root'))));
+  return v;
+}