Code coverage report for imgly-sdk-html5/src/js/lib/extend.js

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/*
 * Photo Editor SDK - photoeditorsdk.com
 * Copyright (c) 2013-2015 9elements GmbH
 *
 * Released under Attribution-NonCommercial 3.0 Unported
 * http://creativecommons.org/licenses/by-nc/3.0/
 *
 * For commercial use, please contact us at contact@9elements.com
 */
 
/**
 * Helper function to correctly set up the prototype chain
 * Based on the backbone.js extend function:
 * https://github.com/jashkenas/backbone/blob/master/backbone.js
 * @param  {Object} prototypeProperties
 * @param  {Object} classProperties
 * @return {Object}
 */
'use strict';
 
module.exports = function (prototypeProperties, classProperties) {
  /*jshint validthis:true*/
  var parent = this;
  var child;
 
  // The constructor function for the new subclass is either defined by you
  // (the 'constructor' property in your `extend` definition), or defaulted
  // by us to simply call the parent's constructor.
  Iif (prototypeProperties && prototypeProperties.hasOwnProperty('constructor')) {
    child = prototypeProperties.constructor;
  } else {
    child = function () {
      return parent.apply(this, arguments);
    };
  }
 
  // Add static properties to the constructor function, if supplied.
  var key;
  for (key in parent) {
    child[key] = parent[key];
  }
  Iif (typeof classProperties !== 'undefined') {
    for (key in classProperties) {
      child[key] = classProperties[key];
    }
  }
 
  // Set the prototype chain to inherit from `parent`, without calling
  // `parent`'s constructor function.
  var Surrogate = function Surrogate() {
    this.constructor = child;
  };
  Surrogate.prototype = parent.prototype;
  child.prototype = new Surrogate();
 
  // Add prototype properties (instance properties) to the subclass,
  // if supplied.
  Eif (prototypeProperties) {
    for (key in prototypeProperties) {
      child.prototype[key] = prototypeProperties[key];
    }
  }
 
  // Set a convenience property in case the parent's prototype is needed
  // later.
  child.__super__ = parent.prototype;
 
  return child;
};
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