use bstr::BStr; use crate::{decode, BandRef, Channel, ErrorRef, PacketLineRef, TextRef, ERR_PREFIX}; impl<'a> PacketLineRef<'a> {    /// Return this instance as slice if it's [`Data`][PacketLineRef::Data].    pub fn as_slice(&self) -> Option<&[u8]> {        match self {            PacketLineRef::Data(d) => Some(d),            PacketLineRef::Flush | PacketLineRef::Delimiter | PacketLineRef::ResponseEnd => None,        }    }    /// Return this instance's [`as_slice()`][PacketLineRef::as_slice()] as [`BStr`].    pub fn as_bstr(&self) -> Option<&BStr> {        self.as_slice().map(Into::into)    }    /// Interpret this instance's [`as_slice()`][PacketLineRef::as_slice()] as [`ErrorRef`].    ///    /// This works for any data received in an error [channel][crate::Channel].    ///    /// Note that this creates an unchecked error using the slice verbatim, which is useful to [serialize it][ErrorRef::write_to()].    /// See [`check_error()`][PacketLineRef::check_error()] for a version that assures the error information is in the expected format.    pub fn as_error(&self) -> Option<ErrorRef<'_>> {        self.as_slice().map(ErrorRef)    }    /// Check this instance's [`as_slice()`][PacketLineRef::as_slice()] is a valid [`ErrorRef`] and return it.    ///    /// This works for any data received in an error [channel][crate::Channel].    pub fn check_error(&self) -> Option<ErrorRef<'_>> {        self.as_slice().and_then(|data| {            if data.len() >= ERR_PREFIX.len() && &data[..ERR_PREFIX.len()] == ERR_PREFIX {                Some(ErrorRef(&data[ERR_PREFIX.len()..]))            } else {                None            }        })    }    /// Return this instance as text, with the trailing newline truncated if present.    pub fn as_text(&self) -> Option<TextRef<'_>> {        self.as_slice().map(Into::into)    }     /// Interpret the data in this [`slice`][PacketLineRef::as_slice()] as [`BandRef`] according to the given `kind` of channel.    ///    /// Note that this is only relevant in a side-band channel.    /// See [`decode_band()`][PacketLineRef::decode_band()] in case `kind` is unknown.    pub fn as_band(&self, kind: Channel) -> Option<BandRef<'_>> {        self.as_slice().map(|d| match kind {            Channel::Data => BandRef::Data(d),            Channel::Progress => BandRef::Progress(d),            Channel::Error => BandRef::Error(d),        })    }     /// Decode the band of this [`slice`][PacketLineRef::as_slice()]    pub fn decode_band(&self) -> Result<BandRef<'_>, decode::band::Error> {        let d = self.as_slice().ok_or(decode::band::Error::NonDataLine)?;        Ok(match d[0] {            1 => BandRef::Data(&d[1..]),            2 => BandRef::Progress(&d[1..]),            3 => BandRef::Error(&d[1..]),            band => return Err(decode::band::Error::InvalidSideBand { band_id: band }),        })    }} impl<'a> From<&'a [u8]> for TextRef<'a> {    fn from(d: &'a [u8]) -> Self {        let d = if d[d.len() - 1] == b'\n' { &d[..d.len() - 1] } else { d };        TextRef(d)    }} impl<'a> TextRef<'a> {    /// Return this instance's data.    pub fn as_slice(&self) -> &[u8] {        self.0    }    /// Return this instance's data as [`BStr`].    pub fn as_bstr(&self) -> &BStr {        self.0.into()    }} #[cfg(all(not(feature = "blocking-io"), feature = "async-io"))]mod async_io;#[cfg(feature = "blocking-io")]mod blocking_io;