pnc-engine 0.2.1

Core engine for PNC: arbitrary-precision RPN evaluation, units, and persistence
Documentation 
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use pnc_engine::{parse, value::Value};

#[test]
fn over_copies_second() {
    let mut stack = Vec::new();
    parse::eval_line(&mut stack, "1 2 over").unwrap();
    assert_eq!(
        stack,
        vec![
            Value::Int(1.into()),
            Value::Int(2.into()),
            Value::Int(1.into())
        ]
    );
}

#[test]
fn rot_rotates_three() {
    let mut stack = Vec::new();
    parse::eval_line(&mut stack, "1 2 3 rot").unwrap();
    assert_eq!(
        stack,
        vec![
            Value::Int(2.into()),
            Value::Int(3.into()),
            Value::Int(1.into())
        ]
    );
}

#[test]
fn to_rational_converts_int() {
    let mut stack = Vec::new();
    parse::eval_line(&mut stack, "5 to_rational").unwrap();
    assert_eq!(
        stack,
        vec![Value::Rational(num_rational::BigRational::new(
            5.into(),
            1.into()
        ))]
    );
}

#[test]
fn to_int_truncates() {
    let mut stack = Vec::new();
    parse::eval_line(&mut stack, "7 2 / to_int").unwrap();
    assert_eq!(stack, vec![Value::Int(3.into())]);
}

#[test]
fn history_capacity_zero_disables_snapshots() {
    use pnc_engine::stack::History;
    use pnc_engine::value::Value;

    let mut history = History::with_capacity(0);
    history.record(vec![Value::Int(1.into())]);
    assert_eq!(history.len(), 0);
    assert!(history.undo().is_none());
    assert!(!history.is_enabled());
}