public static int ParseAddrSpec(
string str,
int index,
int endIndex,
ITokener tokener) {
      int indexStart, indexTemp, state, tx2;
      indexStart = index;
      state = (tokener != null) ? tokener.GetState() : 0;
      indexTemp = index;
      do {
        tx2 = ParseLocalPart(str, index, endIndex, tokener);
        if (tx2 == index) {
          break;
        } else {
          index = tx2;
        }
        if (index < endIndex && (str[index] == 64)) {
          ++index;
        } else {
          index = indexStart; break;
        }
        tx2 = ParseDomain(str, index, endIndex, tokener);
        if (tx2 == index) {
          index = indexStart; break;
        } else {
          index = tx2;
        }
        indexTemp = index;
      } while (false);
      if (tokener != null && indexTemp == indexStart) {
 tokener.RestoreState(state);
}
      return indexTemp;
    }

    public static int ParseAddress(
string str,
int index,
int endIndex,
ITokener tokener) {
      int indexStart, indexTemp, indexTemp2, state;
      indexStart = index;
      state = (tokener != null) ? tokener.GetState() : 0;
      indexTemp = index;
      do {
        indexTemp2 = ParseMailbox(str, index, endIndex, tokener);
        if (indexTemp2 != index) {
          indexTemp = indexTemp2; break;
        }
        indexTemp2 = ParseGroup(str, index, endIndex, tokener);
        if (indexTemp2 != index) {
          indexTemp = indexTemp2; break;
        }
      } while (false);
      if (tokener != null && indexTemp == indexStart) {
 tokener.RestoreState(state);
}
      return indexTemp;
    }

           public override int Parse(
 string str,
 int index,
 int endIndex,
 ITokener tokener)
           {
               return HeaderParser.ParseHeaderListId(str, index, endIndex, tokener);
           }