MD Bookmarks: Add basic page features to new data-flow system

chrome/browser/resources/md_bookmarks/util.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 Utility functions for the Bookmarks page.
+ */
+
+cr.define('bookmarks.util', function() {
+  /**
+   * @param {!BookmarksPageState} state
+   * @return {!Array<string>}
+   */
+  function getDisplayedList(state) {
+    return assert(state.nodes[assert(state.selectedFolder)].children);

[calamity, 2017/03/07 07:27:35]

Does this remove the 'unselected sidebar during search' functionality?

[tsergeant, 2017/03/08 02:47:10]

The plan is that the sidebar will be unselected during search (identical to how
it is today on master)

That will be coming in the next CL (this one doesn't know anything about
search).

+  }
+
+  /**
+   * @param {BookmarkTreeNode} rootNode
+   * @return {NodeList}
+   */
+  function normalizeNodes(rootNode) {
+    /** @type {NodeList} */
+    var nodeMap = {};

[calamity, 2017/03/07 07:27:35]

nit: nodeList?

[tsergeant, 2017/03/08 02:47:11]

Done.

+    var queue = [];

[calamity, 2017/03/07 07:27:35]

Looks more like a stack to me. Jus sayin'.

[tsergeant, 2017/03/08 02:47:10]

Done.

+    queue.push(rootNode);
+
+    while (queue.length > 0) {
+      var node = queue.pop();
+      // Node index is not necessary and not kept up-to-date. Remove it from the
+      // data structure so we don't accidentally depend on the incorrect
+      // information.
+      delete node.index;
+      nodeMap[node.id] = node;
+      if (node.children) {

[calamity, 2017/03/07 07:27:35]

nit: invert and early continue.

[tsergeant, 2017/03/08 02:47:10]

Done.

+        var childIds = [];
+        node.children.forEach(function(child) {
+          childIds.push(child.id);
+          queue.push(child);
+        });
+        node.children = childIds;
+      }
+    }
+
+    return nodeMap;
+  }
+
+  /** @return {!BookmarksPageState} */
+  function createEmptyState() {
+    return {
+      nodes: {},
+      selectedFolder: '0',
+      closedFolders: {},
+    };
+  }
+
+  return {
+    createEmptyState: createEmptyState,
+    getDisplayedList: getDisplayedList,
+    normalizeNodes: normalizeNodes,
+  };
+});