take_while.rs.html -- source

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adler

aho_corasick

packed

teddy

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async_compression

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gzip

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stream

generic

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macros

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async_trait

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base64

read

decoder.rs mod.rs

write

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chunked_encoder.rs decode.rs display.rs encode.rs lib.rs tables.rs

bitflags

bytes

buf

ext

chain.rs limit.rs mod.rs reader.rs take.rs writer.rs

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fmt

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cfg_if

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crc32fast

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eui48

fallible_iterator

flate2

deflate

bufread.rs mod.rs read.rs write.rs

ffi

gz

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zlib

bufread.rs mod.rs read.rs write.rs

bufreader.rs crc.rs lib.rs mem.rs zio.rs

fnv

foreign_types

foreign_types_shared

form_urlencoded

lib.rs query_encoding.rs

futures

futures_channel

mpsc

mod.rs queue.rs sink_impl.rs

lib.rs lock.rs oneshot.rs

futures_core

task

__internal

atomic_waker.rs mod.rs

future.rs lib.rs stream.rs

futures_executor

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futures_io

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join.rs lib.rs select.rs

futures_sink

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futures_util

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future

io

lock

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sink

buffer.rs close.rs drain.rs err_into.rs fanout.rs flush.rs map_err.rs mod.rs send.rs send_all.rs with.rs with_flat_map.rs

stream

task

mod.rs spawn.rs

fns.rs lib.rs never.rs

h2

hashbrown

external_trait_impls

raw

bitmask.rs mod.rs sse2.rs

lib.rs macros.rs map.rs scopeguard.rs set.rs

http

header

map.rs mod.rs name.rs value.rs

uri

authority.rs builder.rs mod.rs path.rs port.rs scheme.rs

byte_str.rs convert.rs error.rs extensions.rs lib.rs method.rs request.rs response.rs status.rs version.rs

http_body

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httparse

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iter.rs lib.rs macros.rs

httpdate

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hyper

body

aggregate.rs body.rs mod.rs to_bytes.rs

client

connect

dns.rs http.rs mod.rs

conn.rs dispatch.rs mod.rs pool.rs service.rs

common

io

mod.rs rewind.rs

buf.rs drain.rs exec.rs lazy.rs mod.rs never.rs task.rs watch.rs

proto

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conn.rs date.rs decode.rs dispatch.rs encode.rs io.rs mod.rs role.rs

h2

client.rs mod.rs ping.rs server.rs

server

accept.rs conn.rs mod.rs shutdown.rs tcp.rs

service

http.rs make.rs mod.rs oneshot.rs util.rs

error.rs headers.rs lib.rs rt.rs upgrade.rs

hyper_tls

client.rs lib.rs stream.rs

idna

lib.rs punycode.rs uts46.rs

indexmap

map

core

equivalent.rs lib.rs macros.rs map.rs mutable_keys.rs set.rs util.rs

iovec

sys

ipnet

ipext.rs ipnet.rs ipnet_serde.rs lib.rs parser.rs

itoa

lazy_static

inline_lazy.rs lib.rs

libc

unix

linux_like

linux

gnu

b64

x86_64

align.rs mod.rs not_x32.rs

align.rs mod.rs

align.rs mod.rs

align.rs mod.rs

fixed_width_ints.rs lib.rs macros.rs

linked_hash_map

log

lib.rs macros.rs

matches

memchr

x86

avx.rs mod.rs sse2.rs

fallback.rs iter.rs lib.rs naive.rs

mime

lib.rs parse.rs

mime_guess

impl_bin_search.rs lib.rs

miniz_oxide

deflate

buffer.rs core.rs mod.rs stream.rs

inflate

core.rs mod.rs output_buffer.rs stream.rs

lib.rs shared.rs

mio

native_tls

imp

net2

sys

unix

impls.rs mod.rs

ext.rs lib.rs socket.rs tcp.rs udp.rs unix.rs utils.rs

num_integer

average.rs lib.rs roots.rs

num_traits

ops

checked.rs inv.rs mod.rs mul_add.rs overflowing.rs saturating.rs wrapping.rs

bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs sign.rs

once_cell

imp_std.rs lib.rs

openssl

openssl_probe

openssl_sys

openstack

osauth

loading

config.rs env.rs mod.rs

adapter.rs apiversion.rs auth.rs basic.rs endpointfilters.rs error.rs identity.rs lib.rs protocol.rs request.rs services.rs session.rs sync.rs url.rs utils.rs

osproto

common.rs identity.rs lib.rs

percent_encoding

pin_project

pin_project_internal

pin_project

attribute.rs derive.rs mod.rs

lib.rs pinned_drop.rs project.rs utils.rs

pin_project_lite

pin_utils

lib.rs projection.rs stack_pin.rs

proc_macro2

detection.rs fallback.rs lib.rs marker.rs parse.rs wrapper.rs

proc_macro_hack

error.rs iter.rs lib.rs parse.rs quote.rs

proc_macro_nested

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

regex

regex_syntax

reqwest

async_impl

body.rs client.rs decoder.rs mod.rs multipart.rs request.rs response.rs

connect.rs error.rs into_url.rs lib.rs proxy.rs redirect.rs tls.rs util.rs

rustc_serialize

base64.rs collection_impls.rs hex.rs json.rs lib.rs serialize.rs

ryu

buffer

pretty

exponent.rs mantissa.rs mod.rs

common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs f2s_intrinsics.rs lib.rs

serde

de

from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

private

de.rs macros.rs mod.rs ser.rs

ser

fmt.rs impls.rs impossible.rs mod.rs

export.rs integer128.rs lib.rs macros.rs

serde_derive

internals

ast.rs attr.rs case.rs check.rs ctxt.rs mod.rs symbol.rs

bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

serde_json

features_check

io

value

de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_urlencoded

ser

key.rs mod.rs pair.rs part.rs value.rs

serde_yaml

value

de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs lib.rs mapping.rs number.rs path.rs ser.rs

slab

socket2

sys

lib.rs sockaddr.rs socket.rs utils.rs

syn

thread_local

cached.rs lib.rs thread_id.rs unreachable.rs

time

display.rs duration.rs lib.rs parse.rs sys.rs

tinyvec

array.rs arrayvec.rs lib.rs tinyvec.rs

tokio

future

maybe_done.rs mod.rs poll_fn.rs ready.rs try_join.rs

io

loom

std

atomic_ptr.rs atomic_u16.rs atomic_u32.rs atomic_u64.rs atomic_u8.rs atomic_usize.rs mod.rs unsafe_cell.rs

macros

cfg.rs join.rs loom.rs mod.rs pin.rs ready.rs scoped_tls.rs select.rs support.rs thread_local.rs try_join.rs

net

tcp

incoming.rs listener.rs mod.rs split.rs split_owned.rs stream.rs

park

either.rs mod.rs thread.rs

runtime

stream

all.rs any.rs chain.rs collect.rs empty.rs filter.rs filter_map.rs fold.rs fuse.rs iter.rs map.rs merge.rs mod.rs next.rs once.rs pending.rs skip.rs skip_while.rs stream_map.rs take.rs take_while.rs timeout.rs try_next.rs

sync

task

blocking.rs mod.rs spawn.rs yield_now.rs

time

driver

atomic_stack.rs entry.rs handle.rs mod.rs registration.rs stack.rs

wheel

level.rs mod.rs stack.rs

clock.rs delay.rs delay_queue.rs error.rs instant.rs interval.rs mod.rs throttle.rs timeout.rs

util

slab

addr.rs entry.rs generation.rs mod.rs page.rs shard.rs slot.rs stack.rs

bit.rs intrusive_double_linked_list.rs linked_list.rs mod.rs rand.rs trace.rs wake.rs

coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_tls

tokio_util

codec

bytes_codec.rs decoder.rs encoder.rs framed.rs framed_read.rs framed_write.rs length_delimited.rs lines_codec.rs mod.rs

tower_service

tracing

dispatcher.rs field.rs instrument.rs level_filters.rs lib.rs macros.rs span.rs stdlib.rs subscriber.rs

tracing_core

callsite.rs dispatcher.rs event.rs field.rs lib.rs metadata.rs parent.rs span.rs stdlib.rs subscriber.rs

tracing_futures

executor

lib.rs stdlib.rs

try_lock

unicase

unicode

ascii.rs lib.rs

unicode_bidi

char_data

mod.rs tables.rs

deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs no_std_prelude.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

waiter

want

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

use crate::stream::Stream;

use core::fmt;
use core::pin::Pin;
use core::task::{Context, Poll};
use pin_project_lite::pin_project;

pin_project! {
    /// Stream for the [`take_while`](super::StreamExt::take_while) method.
    #[must_use = "streams do nothing unless polled"]
    pub struct TakeWhile<St, F> {
        #[pin]
        stream: St,
        predicate: F,
        done: bool,
    }
}

impl<St, F> fmt::Debug for TakeWhile<St, F>
where
    St: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("TakeWhile")
            .field("stream", &self.stream)
            .field("done", &self.done)
            .finish()
    }
}

impl<St, F> TakeWhile<St, F> {
    pub(super) fn new(stream: St, predicate: F) -> Self {
        Self {
            stream,
            predicate,
            done: false,
        }
    }
}

impl<St, F> Stream for TakeWhile<St, F>
where
    St: Stream,
    F: FnMut(&St::Item) -> bool,
{
    type Item = St::Item;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        if !*self.as_mut().project().done {
            self.as_mut().project().stream.poll_next(cx).map(|ready| {
                let ready = ready.and_then(|item| {
                    if !(self.as_mut().project().predicate)(&item) {
                        None
                    } else {
                        Some(item)
                    }
                });

                if ready.is_none() {
                    *self.as_mut().project().done = true;
                }

                ready
            })
        } else {
            Poll::Ready(None)
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        if self.done {
            return (0, Some(0));
        }

        let (_, upper) = self.stream.size_hint();

        (0, upper)
    }
}

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