third_party/google_input_tools/src/chrome/os/inputview/featuretracker.js

   1 // Copyright 2015 The ChromeOS IME Authors. All Rights Reserved.
   2 // limitations under the License.
   3 // See the License for the specific language governing permissions and
   4 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   5 // distributed under the License is distributed on an "AS-IS" BASIS,
   6 // Unless required by applicable law or agreed to in writing, software
   7 //
   8 //      http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // You may obtain a copy of the License at
  11 // you may not use this file except in compliance with the License.
  12 // Licensed under the Apache License, Version 2.0 (the "License");
  13 //
  14 goog.provide('i18n.input.chrome.inputview.FeatureTracker');
  15
  16 goog.require('goog.object');
  17 goog.require('i18n.input.chrome.inputview.FeatureName');
  18
  19 goog.scope(function() {
  20 var Adapter = i18n.input.chrome.inputview.Adapter;
  21 var FeatureName = i18n.input.chrome.inputview.FeatureName;
  22
  23
  24 /**
  25  * Controller for experimental features.
  26  *
  27  * @constructor
  28  */
  29 i18n.input.chrome.inputview.FeatureTracker = function() {
  30
  31   /**
  32    * Whether experimental flags is enabled.
  33    *
  34    * @private {Object.<string, boolean>}
  35    */
  36   this.features_ = {};
  37
  38   /**
  39    * Features that are enabled by default. Any feature not on this list is
  40    * disabled unless the runtime --enable-inputview-{feature} flag is present.
  41    *
  42    * @const
  43    * @private {!Array<FeatureName>}
  44    */
  45   this.ENABLED_BY_DEFAULT_ = [];
  46 };
  47
  48 var FeatureTracker = i18n.input.chrome.inputview.FeatureTracker;
  49
  50
  51 /**
  52  * Whether the feature is enabled.
  53  *
  54  * @param {!FeatureName} feature .
  55  * @return {boolean}
  56  */
  57 FeatureTracker.prototype.isEnabled = function(feature) {
  58   if (feature in this.features_) {
  59     return this.features_[feature];
  60   }
  61   return (this.ENABLED_BY_DEFAULT_.indexOf(feature) >= 0) ||
  62       !!this.features_[FeatureName.EXPERIMENTAL];
  63 };
  64
  65
  66 /**
  67  * Inits the feature tracker.
  68  *
  69  * @param {!Object} config The keyboard config.
  70  */
  71 FeatureTracker.prototype.initialize = function(config) {
  72   if (config.features) {
  73     var features = config.features;
  74     // Parse the run time flags.
  75     for (var i = 0; i < features.length; i++) {
  76       var pieces = features[i].split('-');
  77       var state = pieces.pop();
  78       if (state == 'enabled') {
  79         this.features_[pieces.join('-')] = true;
  80       } else if (state == 'disabled') {
  81         this.features_[pieces.join('-')] = false;
  82       } else {
  83         console.error('Unrecognized flag: ' + features[i]);
  84       }
  85     }
  86   } else {
  87     console.error('API Error. Features not present in config.');
  88     return;
  89   }
  90 };
  91
  92 });  // goog.scope
  93