README.md

coolrule

My blog post: Porting Boolrule to Rust

Boolean expression evaluation engine (a port of boolrule to Rust).

// Without context
let expr = coolrule::new("1 in (1, 2, 3) or 2 > 3")?;
let test = expr.test()?; // true

// With context
let expr = coolrule::new("x ∉ (5, 6, 7)")?;
let test = expr.test_with_context(
    HashMap::from([(vec!["x"], Value::Number(8.0))])
)?; // true

The boolrule test suite has also been ported (and passes) see lib.rs.

Expressions are parsed via PEG parser combinators (powered by pom).

It's around 3x faster than the Python version (before any kind of optimization work).

I'm still learning how to write idiomatic Rust so if you see anything strange please let me know!

Tests

cargo test