rxrust 0.1.0

A Rust implementation of Reactive Extensions.
Documentation 
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use crate::prelude::*;
use std::iter::Step;
use std::ops::Range;

pub fn from_range<Idx>(
  rg: Range<Idx>,
) -> Observable<impl RxFn(&mut dyn Observer<Item = Idx, Err = ()>), Idx, ()>
where
  Idx: Step,
{
  Observable::new(move |subscriber| {
    rg.clone()
      .take_while(|_| !subscriber.is_stopped())
      .for_each(|v| {
        subscriber.next(&v);
      });
    if !subscriber.is_stopped() {
      subscriber.complete();
    }
  })
}

pub fn from_vec<Item>(
  vec: Vec<Item>,
) -> Observable<impl RxFn(&mut dyn Observer<Item = Item, Err = ()>), Item, ()> {
  Observable::new(move |subscriber| {
    vec
      .iter()
      .take_while(|_| !subscriber.is_stopped())
      .for_each(|v| {
        subscriber.next(v);
      });
    if !subscriber.is_stopped() {
      subscriber.complete();
    }
  })
}

pub fn of<Item>(
  v: Item,
) -> Observable<
  RxFnWrapper<impl Fn(&mut dyn Observer<Item = Item, Err = ()>)>,
  Item,
  (),
> {
  Observable::new(move |subscriber| {
    subscriber.next(&v);
    subscriber.complete();
  })
}

pub fn empty<Item>()
-> Observable<impl RxFn(&mut dyn Observer<Item = Item, Err = ()>), Item, ()> {
  Observable::new(move |subscriber| subscriber.complete())
}

#[cfg(test)]
mod test {
  use crate::prelude::*;
  use std::sync::{
    atomic::{AtomicBool, Ordering},
    Arc, Mutex,
  };

  #[test]
  fn from_range() {
    let hit_count = Arc::new(Mutex::new(0));
    let completed = Arc::new(AtomicBool::new(false));
    let c_hit_count = hit_count.clone();
    let c_completed = completed.clone();
    observable::from_range(0..100).subscribe_complete(
      move |_| *hit_count.lock().unwrap() += 1,
      move || completed.store(true, Ordering::Relaxed),
    );

    assert_eq!(*c_hit_count.lock().unwrap(), 100);
    assert_eq!(c_completed.load(Ordering::Relaxed), true);
  }

  #[test]
  fn from_vec() {
    let hit_count = Arc::new(Mutex::new(0));
    let completed = Arc::new(AtomicBool::new(false));
    let c_hit_count = hit_count.clone();
    let c_completed = completed.clone();
    observable::from_vec(vec![0; 100]).subscribe_complete(
      move |_| *hit_count.lock().unwrap() += 1,
      move || completed.store(true, Ordering::Relaxed),
    );

    assert_eq!(*c_hit_count.lock().unwrap(), 100);
    assert_eq!(c_completed.load(Ordering::Relaxed), true);
  }

  #[test]
  fn of() {
    let value = Arc::new(Mutex::new(0));
    let completed = Arc::new(AtomicBool::new(false));
    let c_value = value.clone();
    let c_completed = completed.clone();
    observable::of(100).subscribe_complete(
      move |v| *value.lock().unwrap() = *v,
      move || completed.store(true, Ordering::Relaxed),
    );

    assert_eq!(*c_value.lock().unwrap(), 100);
    assert_eq!(c_completed.load(Ordering::Relaxed), true);
  }

  #[test]
  fn empty() {
    let hits = Arc::new(Mutex::new(0));
    let completed = Arc::new(AtomicBool::new(false));
    let c_hits = hits.clone();
    let c_completed = completed.clone();
    observable::empty().subscribe_complete(
      move |_: &i32| *hits.lock().unwrap() += 1,
      move || completed.store(true, Ordering::Relaxed),
    );

    assert_eq!(*c_hits.lock().unwrap(), 0);
    assert_eq!(c_completed.load(Ordering::Relaxed), true);
  }

  #[test]
  fn fork() {
    use crate::ops::{Filter, Fork, Multicast};
    observable::from_vec(vec![0; 100])
      .multicast()
      .fork()
      .filter(|_v| true)
      .multicast()
      .fork()
      .subscribe(|_| {});

    observable::of(0)
      .multicast()
      .fork()
      .filter(|_v| true)
      .multicast()
      .fork()
      .subscribe(|_| {});
  }
}