bit_shift.rs

use rhai::{Engine, EvalAltResult, INT};

#[test]
fn test_left_shift() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();
    assert_eq!(engine.eval::<INT>("4 << 2")?, 16);
    Ok(())
}

#[test]
fn test_right_shift() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();
    assert_eq!(engine.eval::<INT>("9 >> 1")?, 4);
    Ok(())
}

#[cfg(not(feature = "no_index"))]
#[test]
fn test_bit_fields() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();
    assert!(!engine.eval::<bool>("let x = 10; x[0]")?);
    assert!(engine.eval::<bool>("let x = 10; x[1]")?);
    assert!(!engine.eval::<bool>("let x = 10; x[-1]")?);
    assert_eq!(
        engine.eval::<INT>("let x = 10; x[0] = true; x[1] = false; x")?,
        9
    );
    assert_eq!(engine.eval::<INT>("let x = 10; get_bits(x, 1, 3)")?, 5);
    assert_eq!(
        engine.eval::<INT>("let x = 10; set_bits(x, 1, 3, 7); x")?,
        14
    );
    assert_eq!(
        engine.eval::<INT>(
            "
                let x = 0b001101101010001;
                let count = 0;

                for b in bits(x, 2, 10) {
                    if b { count += 1; }
                }

                count
            "
        )?,
        5
    );

    Ok(())
}