pdfjs-dist/lib/web/preferences.js

/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
var defaultPreferences = null;
function getDefaultPreferences() {
  if (!defaultPreferences) {
    defaultPreferences = Promise.resolve({
      "showPreviousViewOnLoad": true,
      "defaultZoomValue": "",
      "sidebarViewOnLoad": 0,
      "enableHandToolOnLoad": false,
      "enableWebGL": false,
      "pdfBugEnabled": false,
      "disableRange": false,
      "disableStream": false,
      "disableAutoFetch": false,
      "disableFontFace": false,
      "disableTextLayer": false,
      "useOnlyCssZoom": false,
      "externalLinkTarget": 0,
      "enhanceTextSelection": false,
      "renderer": "canvas",
      "renderInteractiveForms": false,
      "enablePrintAutoRotate": false,
      "disablePageLabels": false
    });
  }
  return defaultPreferences;
}
function cloneObj(obj) {
  var result = {};
  for (var i in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, i)) {
      result[i] = obj[i];
    }
  }
  return result;
}
var Preferences = {
  prefs: null,
  isInitializedPromiseResolved: false,
  initializedPromise: null,
  initialize: function preferencesInitialize() {
    return this.initializedPromise = getDefaultPreferences().then(function (defaults) {
      Object.defineProperty(this, 'defaults', {
        value: Object.freeze(defaults),
        writable: false,
        enumerable: true,
        configurable: false
      });
      this.prefs = cloneObj(defaults);
      return this._readFromStorage(defaults);
    }.bind(this)).then(function (prefObj) {
      this.isInitializedPromiseResolved = true;
      if (prefObj) {
        this.prefs = prefObj;
      }
    }.bind(this));
  },
  _writeToStorage: function preferences_writeToStorage(prefObj) {
    return Promise.resolve();
  },
  _readFromStorage: function preferences_readFromStorage(prefObj) {
    return Promise.resolve();
  },
  reset: function preferencesReset() {
    return this.initializedPromise.then(function () {
      this.prefs = cloneObj(this.defaults);
      return this._writeToStorage(this.defaults);
    }.bind(this));
  },
  reload: function preferencesReload() {
    return this.initializedPromise.then(function () {
      this._readFromStorage(this.defaults).then(function (prefObj) {
        if (prefObj) {
          this.prefs = prefObj;
        }
      }.bind(this));
    }.bind(this));
  },
  set: function preferencesSet(name, value) {
    return this.initializedPromise.then(function () {
      if (this.defaults[name] === undefined) {
        throw new Error('preferencesSet: \'' + name + '\' is undefined.');
      } else if (value === undefined) {
        throw new Error('preferencesSet: no value is specified.');
      }
      var valueType = typeof value;
      var defaultType = typeof this.defaults[name];
      if (valueType !== defaultType) {
        if (valueType === 'number' && defaultType === 'string') {
          value = value.toString();
        } else {
          throw new Error('Preferences_set: \'' + value + '\' is a \"' + valueType + '\", expected \"' + defaultType + '\".');
        }
      } else {
        if (valueType === 'number' && (value | 0) !== value) {
          throw new Error('Preferences_set: \'' + value + '\' must be an \"integer\".');
        }
      }
      this.prefs[name] = value;
      return this._writeToStorage(this.prefs);
    }.bind(this));
  },
  get: function preferencesGet(name) {
    return this.initializedPromise.then(function () {
      var defaultValue = this.defaults[name];
      if (defaultValue === undefined) {
        throw new Error('preferencesGet: \'' + name + '\' is undefined.');
      } else {
        var prefValue = this.prefs[name];
        if (prefValue !== undefined) {
          return prefValue;
        }
      }
      return defaultValue;
    }.bind(this));
  }
};
{
  Preferences._writeToStorage = function (prefObj) {
    return new Promise(function (resolve) {
      localStorage.setItem('pdfjs.preferences', JSON.stringify(prefObj));
      resolve();
    });
  };
  Preferences._readFromStorage = function (prefObj) {
    return new Promise(function (resolve) {
      var readPrefs = JSON.parse(localStorage.getItem('pdfjs.preferences'));
      resolve(readPrefs);
    });
  };
}
exports.Preferences = Preferences;