//.CommonJS
var CSSOM = {
	CSSStyleSheet: require("./CSSStyleSheet").CSSStyleSheet,
	CSSStyleRule: require("./CSSStyleRule").CSSStyleRule,
	CSSMediaRule: require("./CSSMediaRule").CSSMediaRule,
	CSSStyleDeclaration: require("./CSSStyleDeclaration").CSSStyleDeclaration,
	CSSKeyframeRule: require('./CSSKeyframeRule').CSSKeyframeRule,
	CSSKeyframesRule: require('./CSSKeyframesRule').CSSKeyframesRule
};
///CommonJS


/**
 * Produces a deep copy of stylesheet — the instance variables of stylesheet are copied recursively.
 * @param {CSSStyleSheet|CSSOM.CSSStyleSheet} stylesheet
 * @nosideeffects
 * @return {CSSOM.CSSStyleSheet}
 */
CSSOM.snapshot = function clone(stylesheet) {

	var cloned = new CSSOM.CSSStyleSheet;

	var rules = stylesheet.cssRules;
	if (!rules) {
		return cloned;
	}

	var RULE_TYPES = {
		1: CSSOM.CSSStyleRule,
		4: CSSOM.CSSMediaRule,
		//3: CSSOM.CSSImportRule,
		//5: CSSOM.CSSFontFaceRule,
		//6: CSSOM.CSSPageRule,
		8: CSSOM.CSSKeyframesRule,
		9: CSSOM.CSSKeyframeRule
	};

	for (var i=0, rulesLength=rules.length; i < rulesLength; i++) {
		var rule = rules[i];
		var ruleClone = cloned.cssRules[i] = new RULE_TYPES[rule.type];

		var style = rule.style;
		if (style) {
			var styleClone = ruleClone.style = new CSSOM.CSSStyleDeclaration;
			for (var j=0, styleLength=style.length; j < styleLength; j++) {
				var name = styleClone[j] = style[j];
				styleClone[name] = style[name];
				styleClone._importants[name] = style.getPropertyPriority(name);
			}
			styleClone.length = style.length;
		}

		if ("keyText" in rule) {
			ruleClone.keyText = rule.keyText;
		}

		if ("selectorText" in rule) {
			ruleClone.selectorText = rule.selectorText;
		}

		if ("mediaText" in rule) {
			ruleClone.mediaText = rule.mediaText;
		}

		if ("cssRules" in rule) {
			rule.cssRules = clone(rule).cssRules;
		}
	}

	return cloned;

};

//.CommonJS
exports.clone = CSSOM.clone;
///CommonJS