Finds parts of complex CSS value
@param {String} str
@returns {Array} Returns list of <code>Range</code>'s
function findParts(str) {
		/** @type StringStream */
		var stream = require('stringStream').create(str);
		var ch;
		var result = [];
		var sep = /[\s\u00a0,]/;
		
		var add = function() {
			stream.next();
			result.push(range(stream.start, stream.current()));
			stream.start = stream.pos;
		};
		
		// skip whitespace
		stream.eatSpace();
		stream.start = stream.pos;
		
		while (ch = stream.next()) {
			if (ch == '"' || ch == "'") {
				stream.next();
				if (!stream.skipTo(ch)) break;
				add();
			} else if (ch == '(') {
				// function found, may have nested function
				stream.backUp(1);
				if (!stream.skipToPair('(', ')')) break;
				stream.backUp(1);
				add();
			} else {
				if (sep.test(ch)) {
					result.push(range(stream.start, stream.current().length - 1));
					stream.eatWhile(sep);
					stream.start = stream.pos;
				}
			}
		}
		
		add();
		
		return _.chain(result)
			.filter(function(item) {
				return !!item.length();
			})
			.uniq(false, function(item) {
				return item.toString();
			})
			.value();
	}