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File: public/js/lib/Extend.class.js

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File: public/js/lib/Extend.class.js
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/** * Syntax: * Class.extend(props) * Class.extend(props, staticProps) * Class.extend([mixins], props) * Class.extend([mixins], props, staticProps) */ (function () { window.Class = function () { /* all magic - in Class.extend */ }; Class.extend = function (props, staticProps) { var mixins = []; // if the first argument - an array, then reassign arguments if ({}.toString.apply(arguments[0]) == "[object Array]") { mixins = arguments[0]; props = arguments[1]; staticProps = arguments[2]; } // This function will be returned as a result of the extend function Constructor() { this.init && this.init.apply(this, arguments); } // this - is a class "to the point", which called for extend (Animal.extend) // inherit from him: Constructor.prototype = Class.inherit(this.prototype); // constructor was substituted by calling inherit Constructor.prototype.constructor = Constructor; // add to inherit more Constructor.extend = Class.extend; // copied to the static properties Constructor copyWrappedProps(staticProps, Constructor, this); // copy in Constructor.prototype properties of mixins and props for (var i = 0; i < mixins.length; i++) { copyWrappedProps(mixins[i], Constructor.prototype, this.prototype); } copyWrappedProps(props, Constructor.prototype, this.prototype); return Constructor; }; //---------- helper methods ---------- // fnTest -- regular expression that checks the function // of the fact whether there is a code in its call _super // // for his announcement, we check whether the function supports the conversion // of the code calling the toString: /xyz/.test(function() {xyz}) // in rare mobile browsers - are not supported, so the result will be /./ var fnTest = /xyz/.test(function () { xyz }) ? /\b_super\b/ : /./; // copies the properties of the props in targetPropsObj // third argument - a parent properties // // copying, if it is found out that the property exists in the parent too, // and is a function - call it wrapped in a wrapper, // which puts on the parent method this._super, // then calls it, then returns this._super function copyWrappedProps(props, targetPropsObj, parentPropsObj) { if (!props) return; for (var name in props) { if (typeof props[name] == "function" && typeof parentPropsObj[name] == "function" && fnTest.test(props[name])) { // ???????????, ???????? ? ??????? targetPropsObj[name] = wrap(props[name], parentPropsObj[name]); } else { targetPropsObj[name] = props[name]; } } } // returns a wrapper around method, which puts this._super to the parent // and then returns it function wrap(method, parentMethod) { return function () { var backup = this._super; this._super = parentMethod; try { return method.apply(this, arguments); } finally { this._super = backup; } } } // Object.create emulation for old IE Class.inherit = Object.create || function (proto) { function F() { } F.prototype = proto; return new F; }; })();