code: public T match(OfInt text)
      {
          if (root == null)
          {
              throw new IllegalStateException("not compiled");
          }
          while (text.hasNext())
          {
              switch (match(text.nextInt()))
              {
                  case Error:
                      return null;
                  case Match:
                      return getMatched();
              }
          }
          return null;
      }
docs: Matches given text as int-iterator. Returns associated token if match, otherwise null.
  @param text
  @return