SAGE2: public/src/Class.js

public/src/Class.js

// SAGE2 is available for use under the SAGE2 Software License
//
// University of Illinois at Chicago's Electronic Visualization Laboratory (EVL)
// and University of Hawai'i at Manoa's Laboratory for Advanced Visualization and
// Applications (LAVA)
//
// See full text, terms and conditions in the LICENSE.txt included file
//
// Copyright (c) 2014

"use strict";

/**
 * @module client
 * @submodule Class
 */

/**
 * Base class for Javascript
 *
 * @class Class
 * @constructor
 */
function Class() { }

/**
 * Adds a constructor function to the class
 *
 * @method construct
 */
Class.prototype.construct = function() {};

/**
 * Method to extent a class, it adds a superClass and inherits the base prototype
 *
 * @method extend
 * @return {Object} class definition
 */
Class.extend = function(def) {
	var classDef = function() {
		if (arguments[0] !== Class) {
			this.construct.apply(this, arguments);
		}
	};

	var proto = new this(Class);
	var superClass = this.prototype;

	for (var n in def) {
		var item = def[n];
		if (item instanceof Function) {
			item.superClass = superClass;
		}
		proto[n] = item;
	}

	classDef.prototype = proto;

	// Give this new class the same static extend method
	classDef.extend = this.extend;
	return classDef;
};