/*
---

name: Object

description: Object generic methods

license: MIT-style license.

requires: Type

provides: [Object, Hash]

...
*/

(function(){

var hasOwnProperty = Object.prototype.hasOwnProperty;

Object.extend({

	subset: function(object, keys){
		var results = {};
		for (var i = 0, l = keys.length; i < l; i++){
			var k = keys[i];
			if (k in object) results[k] = object[k];
		}
		return results;
	},

	map: function(object, fn, bind){
		var results = {};
		for (var key in object){
			if (hasOwnProperty.call(object, key)) results[key] = fn.call(bind, object[key], key, object);
		}
		return results;
	},

	filter: function(object, fn, bind){
		var results = {};
		for (var key in object){
			var value = object[key];
			if (hasOwnProperty.call(object, key) && fn.call(bind, value, key, object)) results[key] = value;
		}
		return results;
	},

	every: function(object, fn, bind){
		for (var key in object){
			if (hasOwnProperty.call(object, key) && !fn.call(bind, object[key], key)) return false;
		}
		return true;
	},

	some: function(object, fn, bind){
		for (var key in object){
			if (hasOwnProperty.call(object, key) && fn.call(bind, object[key], key)) return true;
		}
		return false;
	},

	keys: function(object){
		var keys = [];
		for (var key in object){
			if (hasOwnProperty.call(object, key)) keys.push(key);
		}
		return keys;
	},

	values: function(object){
		var values = [];
		for (var key in object){
			if (hasOwnProperty.call(object, key)) values.push(object[key]);
		}
		return values;
	},

	getLength: function(object){
		return Object.keys(object).length;
	},

	keyOf: function(object, value){
		for (var key in object){
			if (hasOwnProperty.call(object, key) && object[key] === value) return key;
		}
		return null;
	},

	contains: function(object, value){
		return Object.keyOf(object, value) != null;
	},

	toQueryString: function(object, base){
		var queryString = [];

		Object.each(object, function(value, key){
			if (base) key = base + '[' + key + ']';
			var result;
			switch (typeOf(value)){
				case 'object': result = Object.toQueryString(value, key); break;
				case 'array':
					var qs = {};
					value.each(function(val, i){
						qs[i] = val;
					});
					result = Object.toQueryString(qs, key);
				break;
				default: result = key + '=' + encodeURIComponent(value);
			}
			if (value != null) queryString.push(result);
		});

		return queryString.join('&');
	}

});

})();

//<1.2compat>

Hash.implement({

	has: Object.prototype.hasOwnProperty,

	keyOf: function(value){
		return Object.keyOf(this, value);
	},

	hasValue: function(value){
		return Object.contains(this, value);
	},

	extend: function(properties){
		Hash.each(properties || {}, function(value, key){
			Hash.set(this, key, value);
		}, this);
		return this;
	},

	combine: function(properties){
		Hash.each(properties || {}, function(value, key){
			Hash.include(this, key, value);
		}, this);
		return this;
	},

	erase: function(key){
		if (this.hasOwnProperty(key)) delete this[key];
		return this;
	},

	get: function(key){
		return (this.hasOwnProperty(key)) ? this[key] : null;
	},

	set: function(key, value){
		if (!this[key] || this.hasOwnProperty(key)) this[key] = value;
		return this;
	},

	empty: function(){
		Hash.each(this, function(value, key){
			delete this[key];
		}, this);
		return this;
	},

	include: function(key, value){
		if (this[key] == null) this[key] = value;
		return this;
	},

	map: function(fn, bind){
		return new Hash(Object.map(this, fn, bind));
	},

	filter: function(fn, bind){
		return new Hash(Object.filter(this, fn, bind));
	},

	every: function(fn, bind){
		return Object.every(this, fn, bind);
	},

	some: function(fn, bind){
		return Object.some(this, fn, bind);
	},

	getKeys: function(){
		return Object.keys(this);
	},

	getValues: function(){
		return Object.values(this);
	},

	toQueryString: function(base){
		return Object.toQueryString(this, base);
	}

});

Hash.extend = Object.append;

Hash.alias({indexOf: 'keyOf', contains: 'hasValue'});

//</1.2compat>