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-rw-r--r--third_party/rust/futures-util/src/io/lines.rs47
1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/rust/futures-util/src/io/lines.rs b/third_party/rust/futures-util/src/io/lines.rs
new file mode 100644
index 0000000000..b5561bfa7d
--- /dev/null
+++ b/third_party/rust/futures-util/src/io/lines.rs
@@ -0,0 +1,47 @@
+use super::read_line::read_line_internal;
+use futures_core::ready;
+use futures_core::stream::Stream;
+use futures_core::task::{Context, Poll};
+use futures_io::AsyncBufRead;
+use pin_project_lite::pin_project;
+use std::io;
+use std::mem;
+use std::pin::Pin;
+
+pin_project! {
+ /// Stream for the [`lines`](super::AsyncBufReadExt::lines) method.
+ #[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::take(this.buf))))
+ }
+}