io_lines.rs - mozsearch

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use futures::executor::block_on;

use futures::future::{Future, FutureExt};

use futures::io::{AsyncBufReadExt, Cursor};

use futures::stream::{self, StreamExt, TryStreamExt};

use futures::task::Poll;

use futures_test::io::AsyncReadTestExt;

use futures_test::task::noop_context;

fn run<F: Future + Unpin>(mut f: F) -> F::Output {

    let mut cx = noop_context();

    loop {

        if let Poll::Ready(x) = f.poll_unpin(&mut cx) {

            return x;

macro_rules! block_on_next {

    ($expr:expr) => {

        block_on($expr.next()).unwrap().unwrap()

};

macro_rules! run_next {

    ($expr:expr) => {

        run($expr.next()).unwrap().unwrap()

};

#[test]

fn lines() {

    let buf = Cursor::new(&b"12\r"[..]);

    let mut s = buf.lines();

    assert_eq!(block_on_next!(s), "12\r".to_string());

    assert!(block_on(s.next()).is_none());

    let buf = Cursor::new(&b"12\r\n\n"[..]);

    let mut s = buf.lines();

    assert_eq!(block_on_next!(s), "12".to_string());

    assert_eq!(block_on_next!(s), "".to_string());

    assert!(block_on(s.next()).is_none());

#[test]

fn maybe_pending() {

    let buf =

        stream::iter(vec![&b"12"[..], &b"\r"[..]]).map(Ok).into_async_read().interleave_pending();

    let mut s = buf.lines();

    assert_eq!(run_next!(s), "12\r".to_string());

    assert!(run(s.next()).is_none());

    let buf = stream::iter(vec![&b"12"[..], &b"\r\n"[..], &b"\n"[..]])

        .map(Ok)

        .into_async_read()

        .interleave_pending();

    let mut s = buf.lines();

    assert_eq!(run_next!(s), "12".to_string());

    assert_eq!(run_next!(s), "".to_string());

    assert!(run(s.next()).is_none());