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use crate::{memchr, memchr2, memchr3, memrchr, memrchr2, memrchr3};
macro_rules! iter_next {
($self_:expr, $search_result:expr) => {
$search_result.map(move |index| {
$self_.haystack = $self_.haystack.split_at(index + 1).1;
let found_position = $self_.position + index;
$self_.position = found_position + 1;
found_position
})
};
}
macro_rules! iter_next_back {
($self_:expr, $search_result:expr) => {
$search_result.map(move |index| {
$self_.haystack = $self_.haystack.split_at(index).0;
$self_.position + index
})
};
}
pub struct Memchr<'a> {
needle: u8,
haystack: &'a [u8],
position: usize,
}
impl<'a> Memchr<'a> {
#[inline]
pub fn new(needle: u8, haystack: &[u8]) -> Memchr<'_> {
Memchr { needle: needle, haystack: haystack, position: 0 }
}
}
impl<'a> Iterator for Memchr<'a> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
iter_next!(self, memchr(self.needle, self.haystack))
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(0, Some(self.haystack.len()))
}
}
impl<'a> DoubleEndedIterator for Memchr<'a> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
iter_next_back!(self, memrchr(self.needle, self.haystack))
}
}
pub struct Memchr2<'a> {
needle1: u8,
needle2: u8,
haystack: &'a [u8],
position: usize,
}
impl<'a> Memchr2<'a> {
#[inline]
pub fn new(needle1: u8, needle2: u8, haystack: &[u8]) -> Memchr2<'_> {
Memchr2 {
needle1: needle1,
needle2: needle2,
haystack: haystack,
position: 0,
}
}
}
impl<'a> Iterator for Memchr2<'a> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
iter_next!(self, memchr2(self.needle1, self.needle2, self.haystack))
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(0, Some(self.haystack.len()))
}
}
impl<'a> DoubleEndedIterator for Memchr2<'a> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
iter_next_back!(
self,
memrchr2(self.needle1, self.needle2, self.haystack)
)
}
}
pub struct Memchr3<'a> {
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &'a [u8],
position: usize,
}
impl<'a> Memchr3<'a> {
#[inline]
pub fn new(
needle1: u8,
needle2: u8,
needle3: u8,
haystack: &[u8],
) -> Memchr3<'_> {
Memchr3 {
needle1: needle1,
needle2: needle2,
needle3: needle3,
haystack: haystack,
position: 0,
}
}
}
impl<'a> Iterator for Memchr3<'a> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
iter_next!(
self,
memchr3(self.needle1, self.needle2, self.needle3, self.haystack)
)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(0, Some(self.haystack.len()))
}
}
impl<'a> DoubleEndedIterator for Memchr3<'a> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
iter_next_back!(
self,
memrchr3(self.needle1, self.needle2, self.needle3, self.haystack)
)
}
}