1 files changed, 170 insertions, 0 deletions
diff --git a/vendor/futures-util/src/stream/stream/take_until.rs b/vendor/futures-util/src/stream/stream/take_until.rs
new file mode 100644
index 000000000..d14f9ce10
--- /dev/null
+++ b/vendor/futures-util/src/stream/stream/take_until.rs
@@ -0,0 +1,170 @@
+use core::fmt;
+use core::pin::Pin;
+use futures_core::future::Future;
+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;
+
+// FIXME: docs, tests
+
+pin_project! {
+    /// Stream for the [`take_until`](super::StreamExt::take_until) method.
+    #[must_use = "streams do nothing unless polled"]
+    pub struct TakeUntil<St: Stream, Fut: Future> {
+        #[pin]
+        stream: St,
+        // Contains the inner Future on start and None once the inner Future is resolved
+        // or taken out by the user.
+        #[pin]
+        fut: Option<Fut>,
+        // Contains fut's return value once fut is resolved
+        fut_result: Option<Fut::Output>,
+        // Whether the future was taken out by the user.
+        free: bool,
+    }
+}
+
+impl<St, Fut> fmt::Debug for TakeUntil<St, Fut>
+where
+    St: Stream + fmt::Debug,
+    St::Item: fmt::Debug,
+    Fut: Future + fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("TakeUntil").field("stream", &self.stream).field("fut", &self.fut).finish()
+    }
+}
+
+impl<St, Fut> TakeUntil<St, Fut>
+where
+    St: Stream,
+    Fut: Future,
+{
+    pub(super) fn new(stream: St, fut: Fut) -> Self {
+        Self { stream, fut: Some(fut), fut_result: None, free: false }
+    }
+
+    delegate_access_inner!(stream, St, ());
+
+    /// Extract the stopping future out of the combinator.
+    /// The future is returned only if it isn't resolved yet, ie. if the stream isn't stopped yet.
+    /// Taking out the future means the combinator will be yielding
+    /// elements from the wrapped stream without ever stopping it.
+    pub fn take_future(&mut self) -> Option<Fut> {
+        if self.fut.is_some() {
+            self.free = true;
+        }
+
+        self.fut.take()
+    }
+
+    /// Once the stopping future is resolved, this method can be used
+    /// to extract the value returned by the stopping future.
+    ///
+    /// This may be used to retrieve arbitrary data from the stopping
+    /// future, for example a reason why the stream was stopped.
+    ///
+    /// This method will return `None` if the future isn't resolved yet,
+    /// or if the result was already taken out.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # futures::executor::block_on(async {
+    /// use futures::future;
+    /// use futures::stream::{self, StreamExt};
+    /// use futures::task::Poll;
+    ///
+    /// let stream = stream::iter(1..=10);
+    ///
+    /// let mut i = 0;
+    /// let stop_fut = future::poll_fn(|_cx| {
+    ///     i += 1;
+    ///     if i <= 5 {
+    ///         Poll::Pending
+    ///     } else {
+    ///         Poll::Ready("reason")
+    ///     }
+    /// });
+    ///
+    /// let mut stream = stream.take_until(stop_fut);
+    /// let _ = stream.by_ref().collect::<Vec<_>>().await;
+    ///
+    /// let result = stream.take_result().unwrap();
+    /// assert_eq!(result, "reason");
+    /// # });
+    /// ```
+    pub fn take_result(&mut self) -> Option<Fut::Output> {
+        self.fut_result.take()
+    }
+
+    /// Whether the stream was stopped yet by the stopping future
+    /// being resolved.
+    pub fn is_stopped(&self) -> bool {
+        !self.free && self.fut.is_none()
+    }
+}
+
+impl<St, Fut> Stream for TakeUntil<St, Fut>
+where
+    St: Stream,
+    Fut: Future,
+{
+    type Item = St::Item;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<St::Item>> {
+        let mut this = self.project();
+
+        if let Some(f) = this.fut.as_mut().as_pin_mut() {
+            if let Poll::Ready(result) = f.poll(cx) {
+                this.fut.set(None);
+                *this.fut_result = Some(result);
+            }
+        }
+
+        if !*this.free && this.fut.is_none() {
+            // Future resolved, inner stream stopped
+            Poll::Ready(None)
+        } else {
+            // Future either not resolved yet or taken out by the user
+            let item = ready!(this.stream.poll_next(cx));
+            if item.is_none() {
+                this.fut.set(None);
+            }
+            Poll::Ready(item)
+        }
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        if self.is_stopped() {
+            return (0, Some(0));
+        }
+
+        self.stream.size_hint()
+    }
+}
+
+impl<St, Fut> FusedStream for TakeUntil<St, Fut>
+where
+    St: Stream,
+    Fut: Future,
+{
+    fn is_terminated(&self) -> bool {
+        self.is_stopped()
+    }
+}
+
+// Forwarding impl of Sink from the underlying stream
+#[cfg(feature = "sink")]
+impl<S, Fut, Item> Sink<Item> for TakeUntil<S, Fut>
+where
+    S: Stream + Sink<Item>,
+    Fut: Future,
+{
+    type Error = S::Error;
+
+    delegate_sink!(stream, Item);
+}