lines.rs.html -- source

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bigtable

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cookie

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sync

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backoff.rs cache_padded.rs lib.rs thread.rs

curl

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failure

backtrace

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error

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failure_derive

flate2

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ffi

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zlib

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stream

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h2

http

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uri

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http_body

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client

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proto

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hyper_tls

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libc

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libz_sys

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log

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matches

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mime

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mime_guess

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protobuf

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quote

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rand

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literal

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hir

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reqwest

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ryu

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scopeguard

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private

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ser

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serde_urlencoded

ser

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

slab

smallvec

smpl_jwt

error.rs lib.rs

socket2

sys

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string

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synstructure

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time

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tokio

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runtime

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builder.rs mod.rs runtime.rs

threadpool

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util

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clock.rs io.rs lib.rs net.rs prelude.rs timer.rs

tokio_buf

util

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lib.rs never.rs size_hint.rs str.rs u8.rs

tokio_current_thread

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tokio_io

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tokio_sync

mpsc

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task

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lib.rs lock.rs loom.rs oneshot.rs semaphore.rs watch.rs

tokio_tcp

incoming.rs lib.rs listener.rs stream.rs

tokio_threadpool

tokio_timer

try_from

char.rs int.rs lib.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 normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

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

uuid

adapter

core_support

parser

core_support.rs mod.rs std_support.rs

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

want

use std::io::{self, BufRead};
use std::mem;

use futures::{Poll, Stream};

use AsyncRead;

/// Combinator created by the top-level `lines` method which is a stream over
/// the lines of text on an I/O object.
#[derive(Debug)]
pub struct Lines<A> {
    io: A,
    line: String,
}

/// Creates a new stream from the I/O object given representing the lines of
/// input that are found on `A`.
///
/// This method takes an asynchronous I/O object, `a`, and returns a `Stream` of
/// lines that the object contains. The returned stream will reach its end once
/// `a` reaches EOF.
pub fn lines<A>(a: A) -> Lines<A>
where
    A: AsyncRead + BufRead,
{
    Lines {
        io: a,
        line: String::new(),
    }
}

impl<A> Lines<A> {
    /// Returns the underlying I/O object.
    ///
    /// Note that this may lose data already read into internal buffers. It's
    /// recommended to only call this once the stream has reached its end.
    pub fn into_inner(self) -> A {
        self.io
    }
}

impl<A> Stream for Lines<A>
where
    A: AsyncRead + BufRead,
{
    type Item = String;
    type Error = io::Error;

    fn poll(&mut self) -> Poll<Option<String>, io::Error> {
        let n = try_nb!(self.io.read_line(&mut self.line));
        if n == 0 && self.line.len() == 0 {
            return Ok(None.into());
        }
        if self.line.ends_with("\n") {
            self.line.pop();
            if self.line.ends_with("\r") {
                self.line.pop();
            }
        }
        Ok(Some(mem::replace(&mut self.line, String::new())).into())
    }
}