MD Bookmarks: Handle bookmark creation

chrome/browser/resources/md_bookmarks/reducers.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Module of functions which produce a new page state in response
  * to an action. Reducers (in the same sense as Array.prototype.reduce) must be
  * pure functions: they must not modify existing state objects, or make any API
  * calls.
  */
@@ skipping 116 matching lines @@
     var nodeModification = {};
     nodeModification[id] = callback(nodes[id]);
     return Object.assign({}, nodes, nodeModification);
   };
 
   /**
    * @param {NodeList} nodes
    * @param {Action} action
    * @return {NodeList}
    */
+  NodeState.createBookmark = function(nodes, action) {
+    var nodeModifications = {};
+    nodeModifications[action.id] = action.node;
+
+    var parentNode = nodes[action.parentId];
+    var newChildren = parentNode.children.slice();
+    newChildren.splice(action.parentIndex, 0, action.id);
+    nodeModifications[action.parentId] = Object.assign({}, parentNode, {
+      children: newChildren,
+    });
+
+    return Object.assign({}, nodes, nodeModifications);
+  };
+
+  /**
+   * @param {NodeList} nodes
+   * @param {Action} action
+   * @return {NodeList}
+   */
   NodeState.editBookmark = function(nodes, action) {
     // Do not allow folders to change URL (making them no longer folders).
     if (!nodes[action.id].url && action.changeInfo.url)
       delete action.changeInfo.url;
 
     return NodeState.modifyNode_(nodes, action.id, function(node) {
       return /** @type {BookmarkNode} */ (
           Object.assign({}, node, action.changeInfo));
     });
   };
@@ skipping 44 matching lines @@
     return Object.assign({}, nodes, nodeModifications);
   };
 
   /**
    * @param {NodeList} nodes
    * @param {Action} action
    * @return {NodeList}
    */
   NodeState.updateNodes = function(nodes, action) {
     switch (action.name) {
+      case 'create-bookmark':
+        return NodeState.createBookmark(nodes, action);
       case 'edit-bookmark':
         return NodeState.editBookmark(nodes, action);
       case 'remove-bookmark':
         return NodeState.removeBookmark(nodes, action);
       case 'move-bookmark':
         return NodeState.moveBookmark(nodes, action);
       case 'refresh-nodes':
         return action.nodes;
       default:
         return nodes;
@@ skipping 133 matching lines @@
 
   return {
     reduceAction: reduceAction,
     ClosedFolderState: ClosedFolderState,
     NodeState: NodeState,
     SearchState: SearchState,
     SelectedFolderState: SelectedFolderState,
     SelectionState: SelectionState,
   };
 });