chrome/browser/resources/chromeos/chromevox/speech_rules/store_util.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview General utility functions for rule stores.
   7  */
   8
   9 goog.provide('cvox.StoreUtil');
  10
  11
  12 /**
  13  * Count list of nodes and concatenate this with the context string.
  14  * Returns a closure with a local state.
  15  * @param {Array<Node>} nodes A node array.
  16  * @param {?string} context A context string.
  17  * @return {function(): string} A function returning a string.
  18  */
  19 cvox.StoreUtil.nodeCounter = function(nodes, context) {
  20   // Local state.
  21   var localLength = nodes.length;
  22   var localCounter = 0;
  23   var localContext = context;
  24   if (!context) {
  25     localContext = '';
  26   }
  27   return function() {
  28     if (localCounter < localLength) {
  29       localCounter += 1;
  30     }
  31     return localContext + ' ' + localCounter;
  32   };
  33 };