futures-signals 0.3.18

Zero cost FRP signals using the futures crate
Documentation 
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use std::task::Poll;
use futures_signals::signal_vec::{MutableVec, SignalVecExt, VecDiff};

mod util;


#[test]
fn sync() {
    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new());
    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new().signal_vec());
    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new().signal_vec_cloned());

    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new_with_values(vec![]));
    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new_with_values(vec![]).signal_vec());
    let _: Box<dyn Send + Sync> = Box::new(MutableVec::<()>::new_with_values(vec![]).signal_vec_cloned());
}


#[test]
fn filter() {
    /*#[derive(Debug, PartialEq, Eq)]
    struct Change {
        length: usize,
        indexes: Vec<bool>,
        change: VecDiff<u32>,
    }*/

    let input = util::Source::new(vec![
        Poll::Ready(VecDiff::Replace { values: vec![0, 1, 2, 3, 4, 5] }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 6 }),
        Poll::Ready(VecDiff::InsertAt { index: 2, value: 7 }),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 8 }),
        Poll::Ready(VecDiff::InsertAt { index: 7, value: 9 }),
        Poll::Ready(VecDiff::InsertAt { index: 9, value: 10 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 11, value: 11 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 0 }),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 1, value: 0 }),
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 12 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::RemoveAt { index: 1 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
    ]);

    let output = input.filter(|&x| x == 3 || x == 4 || x > 5);

    //assert_eq!(Filter::len(&output), 0);
    //assert_eq!(output.indexes, vec![]);

    let changes = util::map_poll_vec(output, |_output, change| {
        change
        /*Change {
            change: change,
            length: Filter::len(&output),
            indexes: output.indexes.clone(),
        }*/
    });

    assert_eq!(changes, vec![
        Poll::Ready(Some(VecDiff::Replace { values: vec![3, 4] })),
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 0, value: 6 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 1, value: 7 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 2, value: 8 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 4, value: 9 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 6, value: 10 })),
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 7, value: 11 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 2, value: 12 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Ready(None),

        /*Change { length: 2, indexes: vec![false, false, false, true, true, false], change: VecDiff::Replace { values: vec![3, 4] } },
        Change { length: 3, indexes: vec![true, false, false, false, true, true, false], change: VecDiff::InsertAt { index: 0, value: 6 } },
        Change { length: 4, indexes: vec![true, false, true, false, false, true, true, false], change: VecDiff::InsertAt { index: 1, value: 7 } },
        Change { length: 5, indexes: vec![true, false, true, false, false, true, true, true, false], change: VecDiff::InsertAt { index: 2, value: 8 } },
        Change { length: 6, indexes: vec![true, false, true, false, false, true, true, true, true, false], change: VecDiff::InsertAt { index: 4, value: 9 } },
        Change { length: 7, indexes: vec![true, false, true, false, false, true, true, true, true, true, false], change: VecDiff::InsertAt { index: 6, value: 10 } },
        Change { length: 8, indexes: vec![true, false, true, false, false, true, true, true, true, true, false, true], change: VecDiff::InsertAt { index: 7, value: 11 } },
        Change { length: 9, indexes: vec![false, false, true, false, true, true, false, false, false, true, true, true, true, true, false, true], change: VecDiff::InsertAt { index: 2, value: 12 } },
        Change { length: 8, indexes: vec![false, true, true, false, false, false, true, true, true, true, true, false, true], change: VecDiff::RemoveAt { index: 0 } },
        Change { length: 7, indexes: vec![false, true, false, false, false, true, true, true, true, true, false, true], change: VecDiff::RemoveAt { index: 0 } },
        Change { length: 6, indexes: vec![false, false, false, true, true, true, true, true, false, true], change: VecDiff::RemoveAt { index: 0 } },*/
    ]);
}


#[test]
fn filter_map() {
    let input = util::Source::new(vec![
        Poll::Ready(VecDiff::Replace { values: vec![0, 1, 2, 3, 4, 5] }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 6 }),
        Poll::Ready(VecDiff::InsertAt { index: 2, value: 7 }),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 8 }),
        Poll::Ready(VecDiff::InsertAt { index: 7, value: 9 }),
        Poll::Ready(VecDiff::InsertAt { index: 9, value: 10 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 11, value: 11 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 0 }),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 1, value: 0 }),
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 5, value: 12 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::RemoveAt { index: 1 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
    ]);

    let output = input.filter_map(|x| {
        if x == 3 || x == 4 || x > 5 {
            Some(x + 200)

        } else {
            None
        }
    });

    let changes = util::map_poll_vec(output, |_output, change| change);

    assert_eq!(changes, vec![
        Poll::Ready(Some(VecDiff::Replace { values: vec![203, 204] })),
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 0, value: 206 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 1, value: 207 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 2, value: 208 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 4, value: 209 })),
        Poll::Ready(Some(VecDiff::InsertAt { index: 6, value: 210 })),
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 7, value: 211 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::InsertAt { index: 2, value: 212 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(Some(VecDiff::RemoveAt { index: 0 })),
        Poll::Ready(None),
    ]);
}


#[test]
fn sum() {
    let input = util::Source::new(vec![
        Poll::Pending,
        Poll::Ready(VecDiff::Replace { values: vec![0, 1, 2, 3, 4, 5] }),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 6 }),
        Poll::Ready(VecDiff::InsertAt { index: 2, value: 7 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::UpdateAt { index: 4, value: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Move { old_index: 1, new_index: 3 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 1 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Clear {}),
    ]);

    let output = input.sum();

    util::assert_signal_eq(output, vec![
        Poll::Ready(Some(0)),
        Poll::Ready(Some(15)),
        Poll::Pending,
        Poll::Ready(Some(28)),
        Poll::Ready(Some(19)),
        Poll::Pending,
        Poll::Ready(Some(18)),
        Poll::Ready(Some(0)),
        Poll::Ready(None),
    ]);
}


#[test]
fn to_signal_map() {
    let input = util::Source::new(vec![
        Poll::Pending,
        Poll::Ready(VecDiff::Replace { values: vec![0, 1, 2, 3, 4, 5] }),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 6 }),
        Poll::Ready(VecDiff::InsertAt { index: 2, value: 7 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::UpdateAt { index: 4, value: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Move { old_index: 1, new_index: 3 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 1 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Clear {}),
    ]);

    let output = input.to_signal_map(|x| x.into_iter().copied().collect::<Vec<u32>>());

    // TODO include the Pending in the output
    util::assert_signal_eq(output, vec![
        Poll::Ready(Some(vec![])),
        Poll::Ready(Some(vec![0, 1, 2, 3, 4, 5])),
        Poll::Pending,
        Poll::Ready(Some(vec![6, 0, 7, 1, 2, 3, 4, 5])),
        Poll::Ready(Some(vec![0, 7, 1, 2, 0, 4, 5])),
        Poll::Ready(Some(vec![0, 1, 2, 7, 0, 4, 5])),
        Poll::Ready(Some(vec![0, 2, 7, 0, 4, 5])),
        Poll::Ready(Some(vec![])),
        Poll::Ready(None),
    ]);
}


#[test]
fn to_signal_cloned() {
    let input = util::Source::new(vec![
        Poll::Pending,
        Poll::Ready(VecDiff::Replace { values: vec![0, 1, 2, 3, 4, 5] }),
        Poll::Pending,
        Poll::Pending,
        Poll::Ready(VecDiff::InsertAt { index: 0, value: 6 }),
        Poll::Ready(VecDiff::InsertAt { index: 2, value: 7 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 0 }),
        Poll::Ready(VecDiff::UpdateAt { index: 4, value: 0 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Move { old_index: 1, new_index: 3 }),
        Poll::Pending,
        Poll::Ready(VecDiff::RemoveAt { index: 1 }),
        Poll::Pending,
        Poll::Ready(VecDiff::Clear {}),
    ]);

    let output = input.to_signal_cloned();

    util::assert_signal_eq(output, vec![
        Poll::Ready(Some(vec![])),
        Poll::Ready(Some(vec![0, 1, 2, 3, 4, 5])),
        Poll::Pending,
        Poll::Ready(Some(vec![6, 0, 7, 1, 2, 3, 4, 5])),
        Poll::Ready(Some(vec![0, 7, 1, 2, 0, 4, 5])),
        Poll::Ready(Some(vec![0, 1, 2, 7, 0, 4, 5])),
        Poll::Ready(Some(vec![0, 2, 7, 0, 4, 5])),
        Poll::Ready(Some(vec![])),
        Poll::Ready(None),
    ]);
}

#[test]
fn debug_to_signal_cloned() {
    let input: util::Source<VecDiff<u32>> = util::Source::new(vec![]);
    assert_eq!(format!("{:?}", input.to_signal_cloned()), "ToSignalCloned { ... }");
}