Is it possible to add Strings as operators (e. g. AND, OR)?

Is it possible to allow a custom operator to be a string? Example: replace && with AND.

I tried it with this:

Expression e = new Expression("if( a == 1 AND b == 1, 1, 0)");

e.addOperator(new AbstractOperator("AND", Expression.OPERATOR_PRECEDENCE_AND, false, true) {
  @Override
  public BigDecimal eval(BigDecimal v1, BigDecimal v2) {
	
	boolean b1 = v1.compareTo(BigDecimal.ZERO) != 0;
	
	if (!b1) {
	  return BigDecimal.ZERO;
	}
	
	boolean b2 = v2.compareTo(BigDecimal.ZERO) != 0;
	return b2 ? BigDecimal.ONE : BigDecimal.ZERO;
  }
});

BigDecimal result = e.with( "a", "0").and( "b","1").eval(); 

System.out.println(result);

But that results in the exception: Function if expected 3 parameters, got 5

[uklimaschewski]

@Roland09 I have created version 2.4 with your proposed fix. Feel free to open a pull request directly next time. 😃

[Roland09]

@uklimaschewski I guess the solution to the mentioned bug is to simply switch the if-clause, i. e. instead of this:

https://github.com/uklimaschewski/EvalEx/blob/88456407b2043571ae0744d1712c19fa7fbb954f/src/main/java/com/udojava/evalex/Expression.java#L457-L463

it should be this

if (operators.containsKey(token.surface)) {
	token.type = TokenType.OPERATOR;
} else if (ch == '(') {
	token.type = TokenType.FUNCTION;
} else {
	token.type = TokenType.VARIABLE;
}