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File: Class.js
/**
 * Class.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 utilitiy class is used for easier inheritance.
 *
 * Features:
 * * Exposed super functions: this._super();
 * * Mixins
 * * Dummy functions
 * * Property functions: var value = object.value(); and object.value(newValue);
 * * Static functions
 * * Defaults settings
 */
define(
  'tinymce.core.util.Class',
  [
    "tinymce.core.util.Tools"
  ],
  function (Tools) {
    var each = Tools.each, extend = Tools.extend;

    var extendClass, initializing;

    function Class() {
    }

    // Provides classical inheritance, based on code made by John Resig
    Class.extend = extendClass = function (prop) {
      var self = this, _super = self.prototype, prototype, name, member;

      // The dummy class constructor
      function Class() {
        var i, mixins, mixin, self = this;

        // All construction is actually done in the init method
        if (!initializing) {
          // Run class constuctor
          if (self.init) {
            self.init.apply(self, arguments);
          }

          // Run mixin constructors
          mixins = self.Mixins;
          if (mixins) {
            i = mixins.length;
            while (i--) {
              mixin = mixins[i];
              if (mixin.init) {
                mixin.init.apply(self, arguments);
              }
            }
          }
        }
      }

      // Dummy function, needs to be extended in order to provide functionality
      function dummy() {
        return this;
      }

      // Creates a overloaded method for the class
      // this enables you to use this._super(); to call the super function
      function createMethod(name, fn) {
        return function () {
          var self = this, tmp = self._super, ret;

          self._super = _super[name];
          ret = fn.apply(self, arguments);
          self._super = tmp;

          return ret;
        };
      }

      // Instantiate a base class (but only create the instance,
      // don't run the init constructor)
      initializing = true;

      /*eslint new-cap:0 */
      prototype = new self();
      initializing = false;

      // Add mixins
      if (prop.Mixins) {
        each(prop.Mixins, function (mixin) {
          for (var name in mixin) {
            if (name !== "init") {
              prop[name] = mixin[name];
            }
          }
        });

        if (_super.Mixins) {
          prop.Mixins = _super.Mixins.concat(prop.Mixins);
        }
      }

      // Generate dummy methods
      if (prop.Methods) {
        each(prop.Methods.split(','), function (name) {
          prop[name] = dummy;
        });
      }

      // Generate property methods
      if (prop.Properties) {
        each(prop.Properties.split(','), function (name) {
          var fieldName = '_' + name;

          prop[name] = function (value) {
            var self = this, undef;

            // Set value
            if (value !== undef) {
              self[fieldName] = value;

              return self;
            }

            // Get value
            return self[fieldName];
          };
        });
      }

      // Static functions
      if (prop.Statics) {
        each(prop.Statics, function (func, name) {
          Class[name] = func;
        });
      }

      // Default settings
      if (prop.Defaults && _super.Defaults) {
        prop.Defaults = extend({}, _super.Defaults, prop.Defaults);
      }

      // Copy the properties over onto the new prototype
      for (name in prop) {
        member = prop[name];

        if (typeof member == "function" && _super[name]) {
          prototype[name] = createMethod(name, member);
        } else {
          prototype[name] = member;
        }
      }

      // Populate our constructed prototype object
      Class.prototype = prototype;

      // Enforce the constructor to be what we expect
      Class.constructor = Class;

      // And make this class extendible
      Class.extend = extendClass;

      return Class;
    };

    return Class;
  }
);