!7

sclass JavaCalculator extends DynBigNumber {
  S input;
  
  void update {
    S s = dm_getInterestingString();
    if (regexpMatches("[0-9\\.\\-+*/() \t]+", s) && setField(input := s)) {
      setValue("Calculating...");
      try {
        setValue(javaEval(s));
      } catch e {
        setValue("ERROR");
        _handleException(e);
      }
    }
  }
}