Yet Another JavaScript Class Framework

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yajscf

Yet Another JavaScript Class Framework

This is yet another JavaScript class framework. I didn't write it, John Resig did. All I did was package it for npm and format the source in my preferred style.

For the original, see http://ejohn.org/blog/simple-javascript-inheritance/

Class.js

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
/*
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/
// Inspired by base2 and Prototype
var initializing = false, fnTest = /xyz/.test(function()
{
    xyz;
}) ? /\b_super\b/ : /.*/;

/**
 * @class Class
 * The base Class implementation
 */
Class = function() {};

/**
 * @member Class
 * Create a new Class that inherits from this class
 * @param {Object} prop Properties to add to the class.
 */
Class.extend = function(prop)
{
    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;

    // Copy the properties over onto the new prototype
    for(var name in prop)
    {
        // Check if we're overwriting an existing function
        prototype[name] = typeof prop[name] == "function" && typeof _super[name] == "function" &&
                fnTest.test(prop[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, prop[name]) : prop[name];
    }

    // The dummy class constructor
    function Class()
    {
        // All construction is actually done in the init method
        if(!initializing && this.init)
        {
            this.init.apply(this, arguments);
        }
    }

    // Populate our constructed prototype object
    Class.prototype = prototype;

    // Enforce the constructor to be what we expect
    Class.prototype.constructor = Class;

    // And make this class extendable
    Class.extend = arguments.callee;

    return Class;
};

module.exports = Class;

package.json

{
  "name": "yajscf",
  "version": "1.0.3",
  "description": "Yet Another JavaScript Class Framework",
  "main": "Class.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://gist.github.com/bd2f2aef3db09cd457dc.git"
  },
  "keywords": [
    "class",
    "oop"
  ],
  "author": "John Resig",
  "license": "MIT",
  "bugs": {
    "url": "https://gist.github.com/bd2f2aef3db09cd457dc"
  },
  "homepage": "https://gist.github.com/bd2f2aef3db09cd457dc"
}