private String getOperator() {
      boolean gt = matches(1);
      boolean eq = matches(0);
      boolean ls = matches(-1);
      if (gt) {
        if (eq) return ">=";
        if (ls) return "!=";
        return ">";
      }
      if (ls) {
        if (eq) return "<=";
        return "<";
      }
      return "==";
    }
private String getOperator()