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use futures_core::ready;
use futures_core::stream::Stream;
use futures_core::task::{Context, Poll};
use futures_io::AsyncBufRead;
use std::io;
use std::mem;
use std::pin::Pin;
use super::read_line::read_line_internal;
use pin_project_lite::pin_project;
pin_project! {
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Lines<R> {
#[pin]
reader: R,
buf: String,
bytes: Vec<u8>,
read: usize,
}
}
impl<R: AsyncBufRead> Lines<R> {
pub(super) fn new(reader: R) -> Self {
Self {
reader,
buf: String::new(),
bytes: Vec::new(),
read: 0,
}
}
}
impl<R: AsyncBufRead> Stream for Lines<R> {
type Item = io::Result<String>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let this = self.project();
let n = ready!(read_line_internal(this.reader, cx, this.buf, this.bytes, this.read))?;
if n == 0 && this.buf.is_empty() {
return Poll::Ready(None)
}
if this.buf.ends_with('\n') {
this.buf.pop();
if this.buf.ends_with('\r') {
this.buf.pop();
}
}
Poll::Ready(Some(Ok(mem::replace(this.buf, String::new()))))
}
}