08-27-周三_17-09-29

node_modules/dagre-d3-renderer/lib/util.js

@@ -0,0 +1,54 @@
+import _ from 'lodash'
+
+/*
+ * Returns true if the specified node in the graph is a subgraph node. A
+ * subgraph node is one that contains other nodes.
+ */
+function isSubgraph (g, v) {
+  return !!g.children(v).length
+}
+
+function edgeToId (e) {
+  return escapeId(e.v) + ':' + escapeId(e.w) + ':' + escapeId(e.name)
+}
+
+const ID_DELIM = /:/g
+function escapeId (str) {
+  return str ? String(str).replace(ID_DELIM, '\\:') : ''
+}
+
+function applyStyle (dom, styleFn) {
+  if (styleFn) {
+    dom.attr('style', styleFn)
+  }
+}
+
+function applyClass (dom, classFn, otherClasses) {
+  if (classFn) {
+    dom
+      .attr('class', classFn)
+      .attr('class', otherClasses + ' ' + dom.attr('class'))
+  }
+}
+
+function applyTransition (selection, g) {
+  const graph = g.graph()
+
+  if (_.isPlainObject(graph)) {
+    const transition = graph.transition
+    if (_.isFunction(transition)) {
+      return transition(selection)
+    }
+  }
+
+  return selection
+}
+
+// Public utility functions
+export default {
+  isSubgraph,
+  edgeToId,
+  applyStyle,
+  applyClass,
+  applyTransition
+}