README.md

Tiny Expression Evaluator

Supports expressions like:

1. 1+2 - outputs double
2. (1+2) - outputs double
3. 1+2*41 - outputs double
4. 1+2*4-51 - outputs double
5. 1 + 2 * ( 2 - 3) / 41 - outputs double
6. (1+2+3)*41 - outputs double
7. 10/(1+2*3)*41 - outputs double
8. 2021-11-28T14:50:45 + 1 day - outputs LocalDateTime
9. 2021-11-28T14:50:45 - 1 day - outputs LocalDateTime
10. 2021-11-28T14:50:45 unixtime - outputs LocalDateTime
11. str1 + str2 - outputs String
12. str1 + 21 - outputs String
13. 1 + str2 - outputs String

Lookup values are also supported. For example:

ExpressionParser.buildDefault()
        .compile("1 + $param1")
        .eval(new ExpressionAlgoContext(o -> {
            if ("param1".equals(o)) {
                return 2;
            }
            return null;
        }));