Expression language parser and evaluator for cctr constraints.

Supports:

Numbers: 42, -3.14, 0.5
Strings: "hello", "with \"escapes\""
Booleans: true, false
Arrays: [1, 2, 3], ["a", "b"]
Objects: {"key": value, ...}
Arithmetic: +, -, *, /, ^
Comparison: ==, !=, <, <=, >, >=
Logical: and, or, not
String ops: contains, startswith, endswith, matches
Membership: in
Array/object access: a[0], obj["key"], obj.key
Functions: len(s), type(v), keys(obj)
Quantifiers: expr forall x in arr

Example

use cctr_expr::{eval_bool, Value};
use std::collections::HashMap;

let mut vars = HashMap::new();
vars.insert("n".to_string(), Value::Number(42.0));

assert!(eval_bool("n > 0 and n < 100", &vars).unwrap());

cctr-expr 0.16.1

Example