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@aldendaniels
Created December 15, 2014 18:04
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Simple Class
/* Simple JavaScript Inheritance
* By John Resig http://ejohn.org/
* MIT Licensed.
* Modified for code readability and added bindMethods() feature.
*/
// Inspired by base2 and Prototype
var initializing = false;
var fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
// The base Class implementation (does nothing)
var Class = function(){};
// Create a new Class that inherits from this class
Class.extend = function(props) {
var _super = this.prototype;
// Instantiate a base class (but only create the instance,
// don't run the init constructor)
initializing = true;
var prototype = new this();
initializing = false;
// Add the .bindMethods() method.
if (!props.bindMethods) {
props.bindMethods = function() {
for (var name in this) {
if (typeof this[name] === 'function') {
this[name] = this[name].bind(this);
}
}
};
}
// Copy the properties over onto the new prototype
for (var name in props) {
var isOverridingExistingFunction =
typeof props[name] == "function" &&
typeof _super[name] == "function" &&
fnTest.test(props[name]);
if (isOverridingExistingFunction) {
prototype[name] = (function(name, fn){
return function() {
var tmp = this._super;
// Add a new ._super() method that is the same method
// but on the super-class
this._super = _super[name];
// The method only need to be bound temporarily, so we
// remove it when we're done executing
var ret = fn.apply(this, arguments);
this._super = tmp;
return ret;
};
})(name, props[name]);
} else {
prototype[name] = props[name];
}
}
// The dummy class constructor
function Class() {
// All construction is actually done in the init method
if ( !initializing && this.init ) {
if (this.initialize) {
this.initialize.apply(this, arguments);
}
this.init.apply(this, arguments);
}
}
// Populate our constructed prototype object
Class.prototype = prototype;
// Enforce the constructor to be what we expect
Class.constructor = Class;
// And make this class extendable
Class.extend = arguments.callee;
return Class;
};
module.exports = Class;
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