todomvc/examples/canjs_require/bower_components/canjs/amd/can/construct/super.js

> Helping you select an MV\* framework

/*!
 * CanJS - 2.0.3
 * http://canjs.us/
 * Copyright (c) 2013 Bitovi
 * Tue, 26 Nov 2013 18:21:22 GMT
 * Licensed MIT
 * Includes: CanJS default build
 * Download from: http://canjs.us/
 */
define(["can/util/library", "can/construct"], function(can, Construct){

// tests if we can get super in .toString()
	var isFunction = can.isFunction,

		fnTest = /xyz/.test(function() {
			xyz;
		}) ? /\b_super\b/ : /.*/;

		// overwrites a single property so it can still call super
		can.Construct._overwrite = function(addTo, base, name, val) {
			// Check if we're overwriting an existing function
			addTo[name] = isFunction(val) &&
							  isFunction(base[name]) &&
							  fnTest.test(val) ? (function( name, fn ) {
					return function() {
						var tmp = this._super,
							ret;

						// Add a new ._super() method that is the same method
						// but on the super-class
						this._super = base[name];

						// The method only need to be bound temporarily, so we
						// remove it when we're done executing
						ret = fn.apply(this, arguments);
						this._super = tmp;
						return ret;
					};
				})(name, val) : val;
		}

		// overwrites an object with methods, sets up _super
		//   newProps - new properties
		//   oldProps - where the old properties might be
		//   addTo - what we are adding to
		can.Construct._inherit = function( newProps, oldProps, addTo ) {
			addTo = addTo || newProps
			for ( var name in newProps ) {
				can.Construct._overwrite(addTo, oldProps, name, newProps[name]);
			}
		}

	return can;
});