public static RuleSet Parse(string str)
{
string s = str.Trim().TrimEnd('}');
string[] splitted = s.Split(new char[] { '{' });
if (splitted.Length != 2)
throw new InvalidStructureException(String.Format("Ruleset must contains selector and declaration which quoted by {}, the exception string is {0}", str));
RuleSet result = new RuleSet();
foreach (var each in splitted[0].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
{
result.Selectors.Add(Selector.Parse(each));
}
result.Declaration = Declaration.Parse(splitted[1]);
return result;
}