Stalkable objects for Ember

stalkable.js

/*jslint nomen:true */
(function (global) {
  "use strict";
	var Ember = global.Ember;
	Ember.Mixin.prototype.detectInstance = function (object) {
		var name,
			mixins = object[Ember.META_KEY].mixins;
		for (name in mixins) {
			if (this.detect(mixins[name])) {
				return true;
			}
		}
		return false;
	};
	Ember.Stalkable = Ember.Mixin.create({
		setUnknownProperty: function (key, value) {
			var ret = this._super.apply(this, arguments);
			this.observeNewProperty(key);
			return ret;
		},
		observeNewProperty: function (key) {
			var inst = this,
				isProto = inst.constructor.prototype.hasOwnProperty(key),
				clean,
				handler = function () {
					clean = !inst.modifiedProperties;
					if (clean) {
						inst.modifiedProperties = [ key ];
					} else {
						inst.modifiedProperties.push(key);
					}
					if (!isProto) {
						inst.notifyPropertyChange("@ownProperties");
					}
					if (isProto) {
						inst.notifyPropertyChange("@prototypeProperties");
					}
					inst.notifyPropertyChange("@properties");
					if (clean) {
						delete inst.modifiedProperties;
					}
				};
			this.addObserver(key, this, handler);
			handler();
		},
		setProperties: function () {
			var ret;
			this.modifiedProperties = [];
			ret = this._super.apply(this, arguments);
			delete this.modifiedProperties;
			return ret;
		}
	});
	Ember.Object.reopenClass({
		create: function () {
			var C = this,
				ret = this._super.apply(this, arguments);
			if (Ember.Stalkable.detectInstance(ret)) {
				[].slice.apply(arguments).forEach(function (mixin) {
					Object.keys(mixin).forEach(function (key) {
						if (mixin[key] instanceof Function) { return; }
						ret.observeNewProperty(key);
					});
				});
			}
			return ret;
		}
	});
	Ember.StalkableObject = Ember.Object.extend(Ember.Stalkable);
}(this));