lines.rs.html -- source

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abomonation

abomonated.rs lib.rs

abomonation_derive

ansi_term

ansi.rs debug.rs difference.rs display.rs lib.rs style.rs windows.rs write.rs

async_trait

args.rs expand.rs lib.rs lifetime.rs parse.rs receiver.rs

atty

bincode

de

ser

config.rs error.rs internal.rs lib.rs

bitflags

byteorder

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buf

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bytes.rs debug.rs lib.rs

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format

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naive

date.rs datetime.rs internals.rs isoweek.rs time.rs

offset

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date.rs datetime.rs div.rs lib.rs round.rs

clap

dirs

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lib.rs xdg_user_dirs.rs

erdos

fixedbitset

lib.rs range.rs

fnv

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futures_util

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future

io

lock

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sink

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stream

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mod.rs spawn.rs

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indexmap

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align.rs mod.rs

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mio

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petgraph

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fallback.rs lib.rs strnom.rs wrapper.rs

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rand

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hc128.rs lib.rs

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isaac.rs isaac64.rs isaac_array.rs lib.rs

rand_jitter

dummy_log.rs error.rs lib.rs platform.rs

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lib.rs pcg128.rs pcg64.rs

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

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ser

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textwrap

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time

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

tokio

future

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

io

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std

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macros

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net

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util

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

coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_serde

buffer_one.rs lib.rs

tokio_serde_bincode

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codec

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

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

uuid

adapter

core_support

compact.rs mod.rs

parser

core_support.rs mod.rs std_support.rs

builder.rs core_support.rs lib.rs prelude.rs serde_support.rs std_support.rs v4.rs v5.rs

vec_map

use futures_core::stream::Stream;
use futures_core::task::{Context, Poll};
use futures_io::AsyncBufRead;
use std::io;
use std::mem;
use std::pin::Pin;
use super::read_line::read_line_internal;

/// Stream for the [`lines`](super::AsyncBufReadExt::lines) method.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Lines<R> {
    reader: R,
    buf: String,
    bytes: Vec<u8>,
    read: usize,
}

impl<R: Unpin> Unpin for Lines<R> {}

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 Self { reader, buf, bytes, read } = unsafe { self.get_unchecked_mut() };
        let reader = unsafe { Pin::new_unchecked(reader) };
        let n = ready!(read_line_internal(reader, cx, buf, bytes, read))?;
        if n == 0 && buf.is_empty() {
            return Poll::Ready(None)
        }
        if buf.ends_with('\n') {
            buf.pop();
            if buf.ends_with('\r') {
                buf.pop();
            }
        }
        Poll::Ready(Some(Ok(mem::replace(buf, String::new()))))
    }
}

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