80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
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/* Simple JavaScript Inheritance
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* By John Resig http://ejohn.org/
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* MIT Licensed.
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*/
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// Inspired by base2 and Prototype
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/*
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* MODIFICATIONS:
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* * The name of the "constructor" method was changed from "init" to "_constructor"
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* * Mixin Support using https://gist.github.com/1006243
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* * Modified to be a require.js module
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*/
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define(
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[],
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function(){
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var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
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// The base Class implementation (does nothing)
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// with doing that Class is available in the global namespace.
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this.Class = function(){};
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// Create a new Class that inherits from this class
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Class.extend = function() {
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var _super = this.prototype;
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// Instantiate a base class (but only create the instance,
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// don't run the init constructor)
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initializing = true;
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var prototype = new this();
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initializing = false;
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// Copy the properties over onto the new prototype
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for(var i = 0; i < arguments.length; i++) {
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var prop = arguments[i];
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for (var name in prop) {
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// Check if we're overwriting an existing function
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prototype[name] = typeof prop[name] == "function" &&
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typeof _super[name] == "function" && fnTest.test(prop[name]) ?
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(function(name, fn){
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return function() {
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var tmp = this._super;
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// Add a new ._super() method that is the same method
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// but on the super-class
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this._super = _super[name];
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// The method only need to be bound temporarily, so we
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// remove it when we're done executing
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var ret = fn.apply(this, arguments);
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this._super = tmp;
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return ret;
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};
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})(name, prop[name]) :
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prop[name];
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}
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}
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// The dummy class constructor
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function Class() {
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// All construction is actually done in the _constructor method
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if ( !initializing && this._constructor )
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this._constructor.apply(this, arguments);
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}
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// Populate our constructed prototype object
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Class.prototype = prototype;
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// Enforce the constructor to be what we expect
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Class.constructor = Class;
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// And make this class extendable
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Class.extend = arguments.callee;
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return Class;
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};
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return this.Class;
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});
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