Boolean expresion parser and evaluation function for feature flagging - flipper
It parses expression and given input hashmap evaluates and returns true/false
Example of complex expression you can parse and evaluate:
(countryCode=NL or countryCode=DE)
AND uid in (121321,2312312,231231)
and role in (Admin, "Super admin")
and (
uid not in ( ca3ed35c-114f-488d-82b7-7c4d1bd5cbcd, b83f48af-ecb6-4b50-9d5e-b690db2a332b )
or uid <= 0
)
and !(street_name='Random street 1' and countryCode=NL)
given a input hashmap of
let map = HashMap::from([
("countryCode", "DE"),
("uid", "2312312"),
("role", "Super admin"),
("street_name", "Random street 2"),
]);
result would be true
assert_eq!(
eval(
BoolExprParser::parse(Rule::main, &expression)
.expect("Parse error"),
&map
),
true
);
Please see test in src/test.rs testinreadme_documentation()