Function initialize

history.js:1004–1106

* Library initialization * * @return {Boolean} return true if all is well, otherwise return false value

()

   * @return {Boolean} return true if all is well, otherwise return false value
   */
  function initialize() {
    /**
     * Get custom settings from the query string
     */
    var scripts = document.getElementsByTagName('script');
    var src = (scripts[scripts.length - 1] || {}).src || '';
    var arg = src.indexOf('?') !== -1 ? src.split('?').pop() : '';
    arg.replace(/(\w+)(?:=([^&]*))?/g, function(a, key, value) {
      settings[key] = (value || '').replace(/^(0|false)$/, '');
    });

    /**
     * hang up the event handler to listen to the events hashchange
     */
    addEvent(eventNamePrefix + 'hashchange', onHashChange, false);

    // a list of objects with pairs of descriptors/object
    var data = [locationDescriptors, locationObject, eventsDescriptors, global, historyDescriptors, historyObject];

    // if browser support object 'state' in interface 'History'
    if (isSupportStateObjectInHistory) {
      // remove state property from descriptor
      delete historyDescriptors['state'];
    }

    // initializing descriptors
    for(var i = 0; i < data.length; i += 2) {
      for(var prop in data[i]) {
        if (data[i].hasOwnProperty(prop)) {
          if (typeof data[i][prop] !== 'object') {
            // If the descriptor is a simple function, simply just assign it an object
            data[i + 1][prop] = data[i][prop];
          } else {
            // prepare the descriptor the required format
            var descriptor = prepareDescriptorsForObject(data[i], prop, data[i][prop]);
            // try to set the descriptor object
            if (!redefineProperty(data[i + 1], prop, descriptor, function(n, o) {
              // is satisfied if the failed override property
              if (o === historyObject) {
                // the problem occurs in Safari on the Mac
                global.history = historyObject = data[i + 1] = n;
              }
            })) {
              // if there is no possibility override.
              // This browser does not support descriptors, such as IE7

              // remove previously hung event handlers
              removeEvent(eventNamePrefix + 'hashchange', onHashChange, false);

              // fail to initialize :(
              return false;
            }

            // create a repository for custom handlers onpopstate/onhashchange
            if (data[i + 1] === global) {
              eventsList[prop] = eventsList[prop.substr(2)] = [];
            }
          }