forked from mirror/async-std
51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use std::mem;
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use std::pin::Pin;
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use pin_project_lite::pin_project;
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use super::read_until_internal;
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use crate::io::{self, BufRead};
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use crate::stream::Stream;
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use crate::task::{Context, Poll};
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pin_project! {
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/// A stream over the contents of an instance of [`BufRead`] split on a particular byte.
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///
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/// This stream is created by the [`split`] method on types that implement [`BufRead`].
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///
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/// This type is an async version of [`std::io::Split`].
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///
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/// [`split`]: trait.BufRead.html#method.lines
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/// [`BufRead`]: trait.BufRead.html
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/// [`std::io::Split`]: https://doc.rust-lang.org/std/io/struct.Split.html
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#[derive(Debug)]
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pub struct Split<R> {
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#[pin]
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pub(crate) reader: R,
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pub(crate) buf: Vec<u8>,
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pub(crate) read: usize,
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pub(crate) delim: u8,
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}
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}
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impl<R: BufRead> Stream for Split<R> {
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type Item = io::Result<Vec<u8>>;
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fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
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let this = self.project();
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let n = futures_core::ready!(read_until_internal(
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this.reader,
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cx,
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*this.delim,
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this.buf,
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this.read
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))?;
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if n == 0 && this.buf.is_empty() {
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return Poll::Ready(None);
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}
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if this.buf[this.buf.len() - 1] == *this.delim {
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this.buf.pop();
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}
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Poll::Ready(Some(Ok(mem::replace(this.buf, vec![]))))
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}
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}
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