rhai/tests/float.rs

#![cfg(not(feature = "no_float"))]
use rhai::{Engine, EvalAltResult, RegisterFn, FLOAT};

const EPSILON: FLOAT = 0.000_000_000_1;

#[test]
fn test_float() -> Result<(), EvalAltResult> {
    let engine = Engine::new();

    assert_eq!(
        engine.eval::<bool>("let x = 0.0; let y = 1.0; x < y")?,
        true
    );
    assert_eq!(
        engine.eval::<bool>("let x = 0.0; let y = 1.0; x > y")?,
        false
    );
    assert!((engine.eval::<FLOAT>("let x = 9.9999; x")? - 9.9999 as FLOAT).abs() < EPSILON);

    Ok(())
}

#[test]
#[cfg(not(feature = "no_object"))]
fn struct_with_float() -> Result<(), EvalAltResult> {
    #[derive(Clone)]
    struct TestStruct {
        x: f64,
    }

    impl TestStruct {
        fn update(&mut self) {
            self.x += 5.789_f64;
        }

        fn get_x(&mut self) -> f64 {
            self.x
        }

        fn set_x(&mut self, new_x: f64) {
            self.x = new_x;
        }

        fn new() -> Self {
            TestStruct { x: 1.0 }
        }
    }

    let mut engine = Engine::new();

    engine.register_type::<TestStruct>();

    engine.register_get_set("x", TestStruct::get_x, TestStruct::set_x);
    engine.register_fn("update", TestStruct::update);
    engine.register_fn("new_ts", TestStruct::new);

    assert!(
        (engine.eval::<FLOAT>("let ts = new_ts(); ts.update(); ts.x")? - 6.789).abs() < EPSILON
    );
    assert!(
        (engine.eval::<FLOAT>("let ts = new_ts(); ts.x = 10.1001; ts.x")? - 10.1001).abs()
            < EPSILON
    );

    Ok(())
}