wtx 0.45.0

A collection of different transport implementations and related tools focused primarily on web technologies.
Documentation 
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#![allow(clippy::disallowed_methods, reason = "used as fallbacks")]

use crate::misc::{BasicUtf8Error, ExtUtf8Error, IncompleteUtf8Char, Lease, StdUtf8Error};

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_pos_seq(bytes: &[u8], elem: &[u8]) -> Option<usize> {
  #[cfg(feature = "memchr")]
  return memchr::memmem::find(bytes, elem);
  #[cfg(not(feature = "memchr"))]
  return bytes.windows(elem.len()).position(|w| w == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_pos1<B>(bytes: B, elem: u8) -> Option<usize>
where
  B: Lease<[u8]>,
{
  #[cfg(feature = "memchr")]
  return memchr::memchr(elem, bytes.lease());
  #[cfg(not(feature = "memchr"))]
  return bytes.lease().iter().position(|byte| *byte == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_rpos1<B>(bytes: B, elem: u8) -> Option<usize>
where
  B: Lease<[u8]>,
{
  #[cfg(feature = "memchr")]
  return memchr::memrchr(elem, bytes.lease());
  #[cfg(not(feature = "memchr"))]
  return bytes.lease().iter().rposition(|byte| *byte == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_rsplit1(bytes: &[u8], elem: u8) -> impl Iterator<Item = &[u8]> {
  #[cfg(feature = "memchr")]
  return memchr::memrchr_iter(elem, bytes)
    .map(|el| el.wrapping_add(1))
    .chain(core::iter::once(0))
    .scan(bytes.len(), move |end, begin| {
      let rslt = bytes.get(begin..*end);
      *end = begin.wrapping_sub(1);
      rslt
    });
  #[cfg(not(feature = "memchr"))]
  return bytes.rsplit(move |byte| *byte == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_split1(bytes: &[u8], elem: u8) -> impl Clone + Iterator<Item = &[u8]> {
  #[cfg(feature = "memchr")]
  return memchr::memchr_iter(elem, bytes).chain(core::iter::once(bytes.len())).scan(
    0,
    move |begin, end| {
      let rslt = bytes.get(*begin..end);
      *begin = end.wrapping_add(1);
      rslt
    },
  );
  #[cfg(not(feature = "memchr"))]
  return bytes.split(move |byte| *byte == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_split2_indices(bytes: &[u8], [a, b]: [u8; 2]) -> impl Clone + Iterator<Item = usize> {
  #[cfg(feature = "memchr")]
  return memchr::memchr2_iter(a, b, bytes);
  #[cfg(not(feature = "memchr"))]
  return bytes
    .iter()
    .enumerate()
    .filter_map(move |(idx, byte)| (*byte == a || *byte == b).then_some(idx));
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_split_once1(bytes: &[u8], elem: u8) -> Option<(&[u8], &[u8])> {
  let idx = bytes_pos1(bytes, elem)?;
  Some((bytes.get(..idx)?, bytes.get(idx.wrapping_add(1)..)?))
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn bytes_split_once_seq<'bytes>(
  bytes: &'bytes [u8],
  elem: &[u8],
) -> Option<(&'bytes [u8], &'bytes [u8])> {
  let idx = bytes_pos_seq(bytes, elem)?;
  Some((bytes.get(..idx)?, bytes.get(idx.wrapping_add(elem.len())..)?))
}

/// Internally uses `simdutf8` if the feature is active.
#[inline]
pub fn from_utf8_basic(bytes: &[u8]) -> Result<&str, BasicUtf8Error> {
  #[cfg(feature = "simdutf8")]
  return simdutf8::basic::from_utf8(bytes).map_err(|_err| BasicUtf8Error {});
  #[cfg(not(feature = "simdutf8"))]
  return core::str::from_utf8(bytes).map_err(|_err| BasicUtf8Error {});
}

/// Internally uses `simdutf8` if the feature is active.
#[inline]
pub fn from_utf8_ext(bytes: &[u8]) -> Result<&str, ExtUtf8Error> {
  let err = match from_utf8_std(bytes) {
    Ok(elem) => return Ok(elem),
    Err(error) => error,
  };
  match err.error_len {
    None => Err(ExtUtf8Error::Incomplete {
      incomplete_ending_char: bytes
        .split_at_checked(err.valid_up_to)
        .and_then(|(_valid_bytes, after_valid)| IncompleteUtf8Char::new(after_valid))
        .ok_or(ExtUtf8Error::Invalid)?,
    }),
    Some(_) => Err(ExtUtf8Error::Invalid),
  }
}

/// Internally uses `simdutf8` if the feature is active.
#[inline]
pub fn from_utf8_std(bytes: &[u8]) -> Result<&str, StdUtf8Error> {
  #[cfg(feature = "simdutf8")]
  return simdutf8::compat::from_utf8(bytes).map_err(|element| StdUtf8Error {
    valid_up_to: element.valid_up_to(),
    error_len: element.error_len(),
  });
  #[cfg(not(feature = "simdutf8"))]
  return core::str::from_utf8(bytes).map_err(|element| StdUtf8Error {
    valid_up_to: element.valid_up_to(),
    error_len: element.error_len(),
  });
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn str_pos1(str: &str, elem: u8) -> Option<usize> {
  #[cfg(feature = "memchr")]
  return memchr::memchr(elem, str.as_bytes());
  #[cfg(not(feature = "memchr"))]
  return str.as_bytes().iter().position(|byte| *byte == elem);
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn str_rsplit_once1(str: &str, elem: u8) -> Option<(&str, &str)> {
  let idx = bytes_rpos1(str.as_bytes(), elem)?;
  Some((str.get(..idx)?, str.get(idx.wrapping_add(1)..)?))
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn str_split1(str: &str, elem: u8) -> impl Iterator<Item = &str> {
  #[cfg(feature = "memchr")]
  return memchr::memchr_iter(elem, str.as_bytes()).chain(core::iter::once(str.len())).scan(
    0,
    move |begin, end| {
      let rslt = str.get(*begin..end);
      *begin = end.wrapping_add(1);
      rslt
    },
  );
  #[cfg(not(feature = "memchr"))]
  // SAFETY: The source is a string
  return bytes_split1(str.as_bytes(), elem)
    .map(|slice| unsafe { core::str::from_utf8_unchecked(slice) });
}

/// Internally uses `memchr` if the feature is active.
#[inline]
pub fn str_split_once1(str: &str, elem: u8) -> Option<(&str, &str)> {
  let idx = str_pos1(str, elem)?;
  Some((str.get(..idx)?, str.get(idx.wrapping_add(1)..)?))
}