rangetools 0.1.4

Extending the Rust Range structs found in std::ops
Documentation 
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use crate::{EmptyRange, Rangetools as _};

#[test]
fn range() {
    let r = (..).intersection(..);
    let i = r.intersection(1..3);
    assert_eq!(i.into_iter().collect::<Vec<_>>(), vec![1, 2]);
    assert!(!i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
    assert!(r.intersection(1..1).is_empty());
}

#[test]
fn range_from() {
    let r = (..).intersection(..);
    let i = r.intersection(3..);
    assert!(!i.contains(0));
    assert!(!i.contains(1));
    assert!(!i.contains(2));
    assert!(i.contains(3));
    assert!(i.contains(4));
    assert!(!i.is_empty());
}

#[test]
fn range_full() {
    let r = (..).intersection(..);
    let i = r.intersection(..);
    assert!(i.contains(0));
    assert!(i.contains(100));
    assert!(i.contains(1000));
    assert!(!i.is_empty());
}

#[test]
fn range_inclusive() {
    let r = (..).intersection(..);
    let i = r.intersection(1..=3);
    assert_eq!(i.into_iter().collect::<Vec<_>>(), vec![1, 2, 3]);
    assert!(!i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
    assert!(r.intersection(1..=0).is_empty());
}

#[test]
fn range_to() {
    let r = (..).intersection(..);
    let i = r.intersection(..3);
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
}

#[test]
fn range_to_inclusive() {
    let r = (..).intersection(..);
    let i = r.intersection(..=3);
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
}

#[test]
fn bounded_range() {
    let r1 = (..).intersection(..);
    let r2 = (1..3).intersection(..);
    let i = r1.intersection(r2);
    assert_eq!(i.into_iter().collect::<Vec<_>>(), vec![1, 2]);
    assert!(!i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
    let r3 = (1..3).intersection(5..10);
    assert!(r1.intersection(r3).is_empty());
}

#[test]
fn lower_bounded_range() {
    let r1 = (..).intersection(..);
    let r2 = (3..).intersection(..);
    let i = r1.intersection(r2);
    assert_eq!(i.into_iter().take(3).collect::<Vec<_>>(), vec![3, 4, 5]);
    assert!(!i.contains(0));
    assert!(!i.contains(1));
    assert!(!i.contains(2));
    assert!(i.contains(3));
    assert!(i.contains(4));
    assert!(!i.is_empty());
}
#[test]
fn upper_bounded_range() {
    let r1 = (..).intersection(..);
    let r2 = (..3).intersection(..);
    let i = r1.intersection(r2);
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(!i.contains(4));
    assert!(!i.is_empty());
}
#[test]
fn unbounded_range() {
    let r1 = (..).intersection(..);
    let r2 = (..).intersection(..);
    let i = r1.intersection(r2);
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(i.contains(3));
    assert!(i.contains(4));
    assert!(!i.is_empty());
}

#[test]
fn empty_range() {
    let r1 = (..).intersection(..);
    let r2 = EmptyRange::<i32>::new();
    let i = r1.intersection(r2);
    assert!(i.is_empty());
    assert_eq!(i.into_iter().collect::<Vec<_>>(), vec![]);
}

#[test]
fn bounded_set() {
    let r = (..).to_inner();
    let s = (1..3).union(4..6);
    let i = r.intersection(s);
    assert_eq!(i.clone().into_iter().collect::<Vec<_>>(), vec![1, 2, 4, 5]);
    assert!(!i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(i.contains(4));
    assert!(i.contains(5));
    assert!(!i.contains(6));
    assert!(!i.contains(7));
    assert!(!i.contains(8));
    assert!(!i.is_empty());
    let empty_set = (1..1).union(2..2);
    assert!(r.intersection(empty_set).is_empty());
}

#[test]
fn lower_bounded_set() {
    let r = (..).to_inner();
    let s = (3..).union(0..2);
    let i = r.intersection(s);
    assert_eq!(
        i.clone().into_iter().take(3).collect::<Vec<_>>(),
        vec![0, 1, 3]
    );
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(!i.contains(2));
    assert!(i.contains(3));
    assert!(i.contains(4));
    assert!(!i.is_empty());
}

#[test]
fn upper_bounded_set() {
    let r = (..).to_inner();
    let s = (..3).union(4..5);
    let i = r.intersection(s);
    assert!(i.contains(0));
    assert!(i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(i.contains(4));
    assert!(!i.contains(5));
    assert!(!i.is_empty());
}

#[test]
fn unbounded_set() {
    let r = (..).to_inner();
    let s = (2..3).union(..1).union(4..);
    let i = r.intersection(s);
    assert!(i.contains(0));
    assert!(!i.contains(1));
    assert!(i.contains(2));
    assert!(!i.contains(3));
    assert!(i.contains(4));
    assert!(i.contains(5));
    assert!(!i.is_empty());
}