83 lines
2.3 KiB
JavaScript
83 lines
2.3 KiB
JavaScript
/* Simple JavaScript Inheritance for ES 5.1 ( includes polyfill for IE < 9 )
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* based on http://ejohn.org/blog/simple-javascript-inheritance/
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* (inspired by base2 and Prototype)
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* MIT Licensed.
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*/
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(function (global) {
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"use strict";
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if (!Object.create) {
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Object.create = (function () {
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function F() {
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}
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return function (o) {
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if (arguments.length != 1) {
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throw new Error("Object.create implementation only accepts one parameter.");
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}
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F.prototype = o;
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return new F();
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};
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})();
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}
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var fnTest = /xyz/.test(function () {
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xyz;
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}) ? /\b_super\b/ : /.*/;
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// The base Class implementation (does nothing)
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function BaseClass() {
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}
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// Create a new Class that inherits from this class
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BaseClass.extend = function (props) {
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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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var proto = Object.create(_super);
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// Copy the properties over onto the new prototype
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for (var name in props) {
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// Check if we're overwriting an existing function
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proto[name] = typeof props[name] === "function" &&
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typeof _super[name] === "function" && fnTest.test(props[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, props[name]) :
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props[name];
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}
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// The new constructor
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var newClass = typeof proto.init === "function" ?
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proto.init : // All construction is actually done in the init method
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function () {};
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// Populate our constructed prototype object
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newClass.prototype = proto;
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// Enforce the constructor to be what we expect
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proto.constructor = newClass;
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// And make this class extendable
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newClass.extend = BaseClass.extend;
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return newClass;
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};
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// export
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global.Class = BaseClass;
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})(this); |