code: function readMore() {
      while (pos < input.length) {
        if (!utils.isJsonWhitespace(input[pos])) {
          return true;
        }
        pos++;
        parser.streamPos_++;
      }
      return false;
    }
docs: Advances to the first non-whitespace input character.
  
  @return {boolean} return false if no more non-whitespace input character