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use std::mem;
use std::pin::Pin;
use pin_project_lite::pin_project;
use super::read_until_internal;
use crate::io::{self, BufRead};
use crate::stream::Stream;
use crate::task::{Context, Poll};
pin_project! {
#[derive(Debug)]
pub struct Split<R> {
#[pin]
pub(crate) reader: R,
pub(crate) buf: Vec<u8>,
pub(crate) read: usize,
pub(crate) delim: u8,
}
}
impl<R: BufRead> Stream for Split<R> {
type Item = io::Result<Vec<u8>>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let this = self.project();
let n = futures_core::ready!(read_until_internal(
this.reader,
cx,
*this.delim,
this.buf,
this.read
))?;
if n == 0 && this.buf.is_empty() {
return Poll::Ready(None);
}
if this.buf[this.buf.len() - 1] == *this.delim {
this.buf.pop();
}
Poll::Ready(Some(Ok(mem::replace(this.buf, vec![]))))
}
}