/*
---
name    : Sheet

authors   : Thomas Aylott
copyright : © 2010 Thomas Aylott
license   : MIT

provides : Sheet
requires : SheetParser.CSS
...
*/
;(function(exports){


/*<depend>*/
var UNDEF = {undefined:1}

/*<CommonJS>*/
var SheetParser = UNDEF[typeof require]
	?	exports.SheetParser
	:	require('./SheetParser.CSS').SheetParser

exports.Sheet = Sheet
/*</CommonJS>*/

/*<debug>*/;if (!(!UNDEF[typeof SheetParser] && SheetParser.CSS)) throw new Error('Missing required function: "SheetParser.CSS"');/*</debug>*/
/*</depend>*/


Sheet.version = '1.0.2 dev'

function Sheet(cssText){
	if (this instanceof Sheet) this.initialize(cssText)
	else return Sheet.from(cssText)
}

Sheet.from = function(cssText){
	return new Sheet(cssText)
}

Sheet.prototype = {
	
	parser: SheetParser.CSS,
	
	initialize: function(cssText){
		this.cssText = cssText || ''
		this.style = this.rules = this.cssRules = this.parser.parse(this.cssText)
		var self = this
	},
	
	update: function(){
		var cssText = '',
			i = -1,
			rule,
			rules = this.style || this.rules || this.cssRules
		
		while ((rule = rules[++i])){
			if (typeof rule == 'object'){
				// cssRule
				if (this.update) rule.cssText = this.update.call(rule)
				cssText += rule.cssText = rule.selectorText + '{' + rule.cssText + '}'
			} else {
				// style key/value
				cssText += rule + ':'
				cssText += rules[rule] + ';'
			}
		}
		
		if (rules.selectorText)
			return rules.cssText = rules.selectorText + '{' + cssText + '}'
		return rules.cssText = cssText
	}
	
}

Sheet.prototype.toString = Sheet.prototype.update


}(typeof exports != 'undefined' ? exports : this));