08-27-周三_17-09-29

node_modules/dagre-layout/lib/order/add-subgraph-constraints.js

@@ -0,0 +1,53 @@
+import _ from 'lodash'
+
+function addSubgraphConstraints (g, cg, vs) {
+  const prev = {}
+  let rootPrev
+
+  _.forEach(vs, function (v) {
+    let child = g.parent(v)
+    let parent
+    let prevChild
+    while (child) {
+      parent = g.parent(child)
+      if (parent) {
+        prevChild = prev[parent]
+        prev[parent] = child
+      } else {
+        prevChild = rootPrev
+        rootPrev = child
+      }
+      if (prevChild && prevChild !== child) {
+        cg.setEdge(prevChild, child)
+        return
+      }
+      child = parent
+    }
+  })
+
+  /*
+  function dfs(v) {
+    const children = v ? g.children(v) : g.children();
+    if (children.length) {
+      const min = Number.POSITIVE_INFINITY,
+          subgraphs = [];
+      _.forEach(children, function(child) {
+        const childMin = dfs(child);
+        if (g.children(child).length) {
+          subgraphs.push({ v: child, order: childMin });
+        }
+        min = Math.min(min, childMin);
+      });
+      _.reduce(_.sortBy(subgraphs, "order"), function(prev, curr) {
+        cg.setEdge(prev.v, curr.v);
+        return curr;
+      });
+      return min;
+    }
+    return g.node(v).order;
+  }
+  dfs(undefined);
+  */
+}
+
+export default addSubgraphConstraints