public static void ReplaceRule(File input, string oldRuleName, StylesheetRule rule)
 {
     var contents = Encoding.UTF8.GetString(input.ContentBytes);
     var ruleRegex = new Regex(string.Format(_ruleRegexFormat, oldRuleName), RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline);
     contents = ruleRegex.Replace(contents, rule != null ? rule.ToString() : "");
     input.ContentBytes = Encoding.UTF8.GetBytes(contents);
 }
 public static void AppendRule(File input, StylesheetRule rule)
 {
     var contents = Encoding.UTF8.GetString(input.ContentBytes);
     contents += Environment.NewLine + Environment.NewLine + rule.ToString();
     input.ContentBytes = Encoding.UTF8.GetBytes(contents);
 }