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#[inline]
pub fn memchr_double_iter(haystack: &[u8], needle1: u8, needle2: u8) -> MemchrDoubleIter {
MemchrDoubleIter::new(haystack, needle1, needle2)
}
pub struct MemchrDoubleIter<'a> {
haystack: &'a [u8],
needle1: u8,
needle2: u8,
position: usize, }
impl<'a> MemchrDoubleIter<'a> {
#[inline]
pub fn new(haystack: &[u8], needle1: u8, needle2: u8) -> MemchrDoubleIter {
MemchrDoubleIter {
needle1,
needle2,
haystack,
position: 0,
}
}
}
impl<'a> Iterator for MemchrDoubleIter<'a> {
type Item = usize;
#[inline]
fn next(&mut self) -> Option<usize> {
if self.position > self.haystack.len() {
return None;
}
match crate::memchr_double(&self.haystack[self.position..], self.needle1, self.needle2) {
Some(idx) => {
let found = self.position + idx;
self.position = self.position + idx + 1;
Some(found)
}
None => {
self.position = self.haystack.len() + 1;
None
}
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
(0, Some(self.haystack.len()))
}
}
impl<'a> DoubleEndedIterator for MemchrDoubleIter<'a> {
#[inline]
fn next_back(&mut self) -> Option<Self::Item> {
if self.position == 0 {
return None;
}
match crate::memrchr_double(
&self.haystack[..(self.position - 1)],
self.needle1,
self.needle2,
) {
Some(idx) => {
self.position = idx + 1;
Some(idx)
}
None => {
self.position = 0;
None
}
}
}
}