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File: plugin.js
(function () {

var defs = {}; // id -> {dependencies, definition, instance (possibly undefined)}

// Used when there is no 'main' module.
// The name is probably (hopefully) unique so minification removes for releases.
var register_3795 = function (id) {
  var module = dem(id);
  var fragments = id.split('.');
  var target = Function('return this;')();
  for (var i = 0; i < fragments.length - 1; ++i) {
    if (target[fragments[i]] === undefined)
      target[fragments[i]] = {};
    target = target[fragments[i]];
  }
  target[fragments[fragments.length - 1]] = module;
};

var instantiate = function (id) {
  var actual = defs[id];
  var dependencies = actual.deps;
  var definition = actual.defn;
  var len = dependencies.length;
  var instances = new Array(len);
  for (var i = 0; i < len; ++i)
    instances[i] = dem(dependencies[i]);
  var defResult = definition.apply(null, instances);
  if (defResult === undefined)
     throw 'module [' + id + '] returned undefined';
  actual.instance = defResult;
};

var def = function (id, dependencies, definition) {
  if (typeof id !== 'string')
    throw 'module id must be a string';
  else if (dependencies === undefined)
    throw 'no dependencies for ' + id;
  else if (definition === undefined)
    throw 'no definition function for ' + id;
  defs[id] = {
    deps: dependencies,
    defn: definition,
    instance: undefined
  };
};

var dem = function (id) {
  var actual = defs[id];
  if (actual === undefined)
    throw 'module [' + id + '] was undefined';
  else if (actual.instance === undefined)
    instantiate(id);
  return actual.instance;
};

var req = function (ids, callback) {
  var len = ids.length;
  var instances = new Array(len);
  for (var i = 0; i < len; ++i)
    instances.push(dem(ids[i]));
  callback.apply(null, callback);
};

var ephox = {};

ephox.bolt = {
  module: {
    api: {
      define: def,
      require: req,
      demand: dem
    }
  }
};

var define = def;
var require = req;
var demand = dem;
// this helps with minificiation when using a lot of global references
var defineGlobal = function (id, ref) {
  define(id, [], function () { return ref; });
};
/*jsc
["tinymce.plugins.autosave.Plugin","tinymce.core.EditorManager","tinymce.core.PluginManager","tinymce.core.util.LocalStorage","tinymce.core.util.Tools","global!window","global!tinymce.util.Tools.resolve"]
jsc*/
defineGlobal("global!tinymce.util.Tools.resolve", tinymce.util.Tools.resolve);
/**
 * ResolveGlobal.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

define(
  'tinymce.core.EditorManager',
  [
    'global!tinymce.util.Tools.resolve'
  ],
  function (resolve) {
    return resolve('tinymce.EditorManager');
  }
);

/**
 * ResolveGlobal.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

define(
  'tinymce.core.PluginManager',
  [
    'global!tinymce.util.Tools.resolve'
  ],
  function (resolve) {
    return resolve('tinymce.PluginManager');
  }
);

/**
 * ResolveGlobal.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

define(
  'tinymce.core.util.LocalStorage',
  [
    'global!tinymce.util.Tools.resolve'
  ],
  function (resolve) {
    return resolve('tinymce.util.LocalStorage');
  }
);

/**
 * ResolveGlobal.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

define(
  'tinymce.core.util.Tools',
  [
    'global!tinymce.util.Tools.resolve'
  ],
  function (resolve) {
    return resolve('tinymce.util.Tools');
  }
);

defineGlobal("global!window", window);
/**
 * Plugin.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class contains all core logic for the autosave plugin.
 *
 * @class tinymce.autosave.Plugin
 * @private
 */
define(
  'tinymce.plugins.autosave.Plugin',
  [
    'tinymce.core.EditorManager',
    'tinymce.core.PluginManager',
    'tinymce.core.util.LocalStorage',
    'tinymce.core.util.Tools',
    'global!window'
  ],
  function (EditorManager, PluginManager, LocalStorage, Tools, window) {
    EditorManager._beforeUnloadHandler = function () {
      var msg;

      Tools.each(EditorManager.get(), function (editor) {
        // Store a draft for each editor instance
        if (editor.plugins.autosave) {
          editor.plugins.autosave.storeDraft();
        }

        // Setup a return message if the editor is dirty
        if (!msg && editor.isDirty() && editor.getParam("autosave_ask_before_unload", true)) {
          msg = editor.translate("You have unsaved changes are you sure you want to navigate away?");
        }
      });

      return msg;
    };

    PluginManager.add('autosave', function (editor) {
      var settings = editor.settings, prefix, started;

      prefix = settings.autosave_prefix || 'tinymce-autosave-{path}{query}-{id}-';
      prefix = prefix.replace(/\{path\}/g, document.location.pathname);
      prefix = prefix.replace(/\{query\}/g, document.location.search);
      prefix = prefix.replace(/\{id\}/g, editor.id);

      function parseTime(time, defaultTime) {
        var multipels = {
          s: 1000,
          m: 60000
        };

        time = /^(\d+)([ms]?)$/.exec('' + (time || defaultTime));

        return (time[2] ? multipels[time[2]] : 1) * parseInt(time, 10);
      }

      function hasDraft() {
        var time = parseInt(LocalStorage.getItem(prefix + "time"), 10) || 0;

        if (new Date().getTime() - time > settings.autosave_retention) {
          removeDraft(false);
          return false;
        }

        return true;
      }

      function removeDraft(fire) {
        LocalStorage.removeItem(prefix + "draft");
        LocalStorage.removeItem(prefix + "time");

        if (fire !== false) {
          editor.fire('RemoveDraft');
        }
      }

      function storeDraft() {
        if (!isEmpty() && editor.isDirty()) {
          LocalStorage.setItem(prefix + "draft", editor.getContent({ format: 'raw', no_events: true }));
          LocalStorage.setItem(prefix + "time", new Date().getTime());
          editor.fire('StoreDraft');
        }
      }

      function restoreDraft() {
        if (hasDraft()) {
          editor.setContent(LocalStorage.getItem(prefix + "draft"), { format: 'raw' });
          editor.fire('RestoreDraft');
        }
      }

      function startStoreDraft() {
        if (!started) {
          setInterval(function () {
            if (!editor.removed) {
              storeDraft();
            }
          }, settings.autosave_interval);

          started = true;
        }
      }

      settings.autosave_interval = parseTime(settings.autosave_interval, '30s');
      settings.autosave_retention = parseTime(settings.autosave_retention, '20m');

      function postRender() {
        var self = this;

        self.disabled(!hasDraft());

        editor.on('StoreDraft RestoreDraft RemoveDraft', function () {
          self.disabled(!hasDraft());
        });

        startStoreDraft();
      }

      function restoreLastDraft() {
        editor.undoManager.beforeChange();
        restoreDraft();
        removeDraft();
        editor.undoManager.add();
      }

      editor.addButton('restoredraft', {
        title: 'Restore last draft',
        onclick: restoreLastDraft,
        onPostRender: postRender
      });

      editor.addMenuItem('restoredraft', {
        text: 'Restore last draft',
        onclick: restoreLastDraft,
        onPostRender: postRender,
        context: 'file'
      });

      function isEmpty(html) {
        var forcedRootBlockName = editor.settings.forced_root_block;

        html = Tools.trim(typeof html == "undefined" ? editor.getBody().innerHTML : html);

        return html === '' || new RegExp(
          '^<' + forcedRootBlockName + '[^>]*>((\u00a0|&nbsp;|[ \t]|<br[^>]*>)+?|)<\/' + forcedRootBlockName + '>|<br>$', 'i'
        ).test(html);
      }

      if (editor.settings.autosave_restore_when_empty !== false) {
        editor.on('init', function () {
          if (hasDraft() && isEmpty()) {
            restoreDraft();
          }
        });

        editor.on('saveContent', function () {
          removeDraft();
        });
      }

      window.onbeforeunload = EditorManager._beforeUnloadHandler;

      this.hasDraft = hasDraft;
      this.storeDraft = storeDraft;
      this.restoreDraft = restoreDraft;
      this.removeDraft = removeDraft;
      this.isEmpty = isEmpty;
    });

    return function () { };
  }
);
dem('tinymce.plugins.autosave.Plugin')();
})();