Fan.Sys.FanStr.getRange C# (CSharp) Method

        public static string getRange(string self, Range r)
        {
            int size = self.Length;

              int s = r.start(size);
              int e = r.end(size);
              if (e+1 < s) throw IndexErr.make(r).val;

              return self.Substring(s, (e-s)+1);
        }