/*
---
name    : SheetParser.CSS

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

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

/*<depend>*/
var UNDEF = {undefined:1}
if (!exports.SheetParser) exports.SheetParser = {}

/*<CommonJS>*/
var combineRegExp = (UNDEF[typeof module] || !module.exports)
	?	exports.combineRegExp
	:	require('./sg-regex-tools').combineRegExp
var SheetParser = exports.SheetParser
/*</CommonJS>*/

/*<debug>*/;if (UNDEF[typeof combineRegExp]) throw new Error('Missing required function: "combineRegExp"');/*</debug>*/
/*</depend>*/


var CSS = SheetParser.CSS = {version: '1.0.2 dev'}

CSS.trim = trim
function trim(str){
	// http://blog.stevenlevithan.com/archives/faster-trim-javascript
	var	str = (''+str).replace(/^\s\s*/, ''),
		ws = /\s/,
		i = str.length;
	while (ws.test(str.charAt(--i)));
	return str.slice(0, i + 1);
}

CSS.camelCase = function(string){
	return ('' + string).replace(camelCaseSearch, camelCaseReplace)
}
var camelCaseSearch = /-\D/g
function camelCaseReplace(match){
	return match.charAt(1).toUpperCase()
}

CSS.parse = function(cssText){
	var	found
	,	rule
	,	rules = {length:0}
	,	keyIndex = -1
	,	regex = this.parser
	,	names = CSS.parser.names
	,	i,r,l
	,	ruleCount
	
	rules.cssText = cssText = trim(cssText)
	
	// strip comments
	cssText = cssText.replace(CSS.comment, '');
	
	regex.lastIndex = 0
	while ((found = regex.exec(cssText))){
		// avoid an infinite loop on zero-length keys
		if (regex.lastIndex == found.index) ++ regex.lastIndex
		
		// key:value
		if (found[names._key]){
			rules[rules.length ++] = found[names._key]
			rules[found[names._key]] = found[names._value]
			rules[CSS.camelCase(found[names._key])] = found[names._value]
			continue
		}
		
		rules[rules.length++] = rule = {}
		for (i = 0, l = names.length; i < l; ++i){
			if (!(names[i-1] && found[i])) continue
			rule[names[i-1]] = trim(found[i])
		}
	}
	
	var atKey, atRule, atList, atI
	for (i = 0, l = rules.length; i < l; ++i){
		if (!rules[i]) continue
		
		if (rules[i]._style_cssText){
			rules[i].style = CSS.parse(rules[i]._style_cssText)
			delete rules[i]._style_cssText
		}
		
		// _atKey/_atValue
		if (atKey = rules[i]._atKey){
			atKey = CSS.camelCase(atKey)
			atRule = {length:0}
			rules[i][atKey] = atRule
			atRule["_source"] =
			atRule[atKey + "Text"] = rules[i]._atValue
			atList = ('' + rules[i]._atValue).split(/,\s*/)
			for (atI = 0; atI < atList.length; ++atI){
				atRule[atRule.length ++] = atList[atI]
			}
			rules[i].length = 1
			rules[i][0] = atKey
			delete rules[i]._atKey
			delete rules[i]._atValue
		}
		
		if (rules[i].style)
		for (ruleCount = -1, r = -1, rule; rule = rules[i].style[++r];){
			if (typeof rule == 'string') continue
			rules[i][r] = (rules[i].cssRules || (rules[i].cssRules = {}))[++ ruleCount]  = rule
			rules[i].cssRules.length = ruleCount + 1
			rules[i].rules = rules[i].cssRules
		}
	}
	
	return rules
}

var x = combineRegExp
var OR = '|'

;(CSS.at = x(/\s*@([-a-zA-Z0-9]+)\s+(([\w-]+)?[^;{]*)/))
.names=[         '_atKey',           '_atValue', 'name']

CSS.atRule = x([CSS.at, ';'])

;(CSS.keyValue_key = x(/([-a-zA-Z0-9]+)/))
.names=[                '_key']

;(CSS.keyValue_value_end = x(/(?:;|(?=\})|$)/))

;(CSS.notString = x(/[^"']+/))
;(CSS.stringSingle = x(/"(?:[^"]|\\")*"/))
;(CSS.stringDouble = x(/'(?:[^']|\\')*'/))
;(CSS.string = x(['(?:',CSS.stringSingle ,OR, CSS.stringDouble,')']))
;(CSS.propertyValue = x([/[^;}]+/, CSS.keyValue_value_end]))

var rRound = "(?:[^()]|\\((?:[^()]|\\((?:[^()]|\\((?:[^()]|\\([^()]*\\))*\\))*\\))*\\))"

;(CSS.keyValue_value = x(
[
	x(['((?:'
	,	CSS.stringSingle
	,	OR
	,	CSS.stringDouble
	,	OR
	,	"\\("+rRound+"*\\)"
	,	OR
	,	/[^;}()]/ // not a keyValue_value terminator
	,	')*)'
	])
,	CSS.keyValue_value_end
])).names = ['_value']

;(CSS.keyValue = x([CSS.keyValue_key ,/\s*:\s*/, CSS.keyValue_value]))

;(CSS.comment = x(/\/\*\s*((?:[^*]|\*(?!\/))*)\s*\*\//))
.names=[                   'comment']

;(CSS.selector = x(['(',/\s*(\d+%)\s*/,OR,'(?:',/[^{}'"()]|\([^)]*\)|\[[^\]]*\]/,')+',')']))
.names=[    'selectorText','keyText']

var rCurly = "(?:[^{}]|\\{(?:[^{}]|\\{(?:[^{}]|\\{(?:[^{}]|\\{[^{}]*\\})*\\})*\\})*\\})"
var rCurlyRound = "(?:[^{}()]+|\\{(?:[^{}()]+|\\{(?:[^{}()]+|\\{(?:[^{}()]+|\\{[^{}()]*\\})*\\})*\\})*\\})"

;(CSS.block = x("\\{\\s*((?:"+"\\("+rRound+"*\\)|"+rCurly+")*)\\s*\\}"))
.names=[              '_style_cssText']

CSS.selectorBlock = x([CSS.selector, CSS.block])

CSS.atBlock = x([CSS.at, CSS.block])

CSS.parser = x
(
	[	x(CSS.comment)
	,	OR
	,	x(CSS.atBlock)
	,	OR
	,	x(CSS.atRule)
	,	OR
	,	x(CSS.selectorBlock)
	,	OR
	,	x(CSS.keyValue)
	]
,	'cssText'
);


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