parseCSS.js // returns parsed CSS text as a JavaScript object

parseCSS.js

(function (global) {
	function cssTextClean(cssText) {
		return cssText
			.replace(/\/\*[\W\w]*?\*\//g, '') // remove comments
			.replace(/^\s+|\s+$/g, '') // trim trailing space
			.replace(/\s*([:;{}])\s*/g, '$1') // trim trailing separator space
			.replace(/\};+/g, '}') // remove extra separators
			.replace(/([^:;{}])}/g, '$1;}') // add trailing separators
	}

	function parseCSS(css) {
		return parseCSSToObject(cssTextClean(css), /([^{};]*)([;{}])/g, css = { selector: 'all', value: [] }), css;
	}

	function parseCSSToObject(css, cssRegExp, cssObject) {
		for (var m, obj; (m = cssRegExp.exec(css)) != null;) {
			if (m[2] == '{') cssObject.value.push(obj = { parent: cssObject, selector: m[1], value: [] }) && (cssObject = obj);
			else if (m[2] == '}') cssObject = cssObject.parent;
			else if (m[2] == ';') cssObject.value.push(m[1]);
		}
	}

	global.parseCSS = parseCSS;
})(this);