1 files changed, 86 insertions, 0 deletions
diff --git a/vendor/futures-util/src/stream/stream/take.rs b/vendor/futures-util/src/stream/stream/take.rs
new file mode 100644
index 000000000..b1c728e33
--- /dev/null
+++ b/vendor/futures-util/src/stream/stream/take.rs
@@ -0,0 +1,86 @@
+use core::cmp;
+use core::pin::Pin;
+use futures_core::ready;
+use futures_core::stream::{FusedStream, Stream};
+use futures_core::task::{Context, Poll};
+#[cfg(feature = "sink")]
+use futures_sink::Sink;
+use pin_project_lite::pin_project;
+
+pin_project! {
+    /// Stream for the [`take`](super::StreamExt::take) method.
+    #[derive(Debug)]
+    #[must_use = "streams do nothing unless polled"]
+    pub struct Take<St> {
+        #[pin]
+        stream: St,
+        remaining: usize,
+    }
+}
+
+impl<St: Stream> Take<St> {
+    pub(super) fn new(stream: St, n: usize) -> Self {
+        Self { stream, remaining: n }
+    }
+
+    delegate_access_inner!(stream, St, ());
+}
+
+impl<St> Stream for Take<St>
+where
+    St: Stream,
+{
+    type Item = St::Item;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<St::Item>> {
+        if self.remaining == 0 {
+            Poll::Ready(None)
+        } else {
+            let this = self.project();
+            let next = ready!(this.stream.poll_next(cx));
+            if next.is_some() {
+                *this.remaining -= 1;
+            } else {
+                *this.remaining = 0;
+            }
+            Poll::Ready(next)
+        }
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        if self.remaining == 0 {
+            return (0, Some(0));
+        }
+
+        let (lower, upper) = self.stream.size_hint();
+
+        let lower = cmp::min(lower, self.remaining as usize);
+
+        let upper = match upper {
+            Some(x) if x < self.remaining as usize => Some(x),
+            _ => Some(self.remaining as usize),
+        };
+
+        (lower, upper)
+    }
+}
+
+impl<St> FusedStream for Take<St>
+where
+    St: FusedStream,
+{
+    fn is_terminated(&self) -> bool {
+        self.remaining == 0 || self.stream.is_terminated()
+    }
+}
+
+// Forwarding impl of Sink from the underlying stream
+#[cfg(feature = "sink")]
+impl<S, Item> Sink<Item> for Take<S>
+where
+    S: Stream + Sink<Item>,
+{
+    type Error = S::Error;
+
+    delegate_sink!(stream, Item);
+}