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use core::str::pattern::{Pattern, SearchStep, Searcher};
use crate::{Matches, Regex};
#[derive(Debug)]
pub struct RegexSearcher<'r, 't> {
haystack: &'t str,
it: Matches<'r, 't>,
last_step_end: usize,
next_match: Option<(usize, usize)>,
}
impl<'r, 't> Pattern<'t> for &'r Regex {
type Searcher = RegexSearcher<'r, 't>;
fn into_searcher(self, haystack: &'t str) -> RegexSearcher<'r, 't> {
RegexSearcher {
haystack,
it: self.find_iter(haystack),
last_step_end: 0,
next_match: None,
}
}
}
unsafe impl<'r, 't> Searcher<'t> for RegexSearcher<'r, 't> {
#[inline]
fn haystack(&self) -> &'t str {
self.haystack
}
#[inline]
fn next(&mut self) -> SearchStep {
if let Some((s, e)) = self.next_match {
self.next_match = None;
self.last_step_end = e;
return SearchStep::Match(s, e);
}
match self.it.next() {
None => {
if self.last_step_end < self.haystack().len() {
let last = self.last_step_end;
self.last_step_end = self.haystack().len();
SearchStep::Reject(last, self.haystack().len())
} else {
SearchStep::Done
}
}
Some(m) => {
let (s, e) = (m.start(), m.end());
if s == self.last_step_end {
self.last_step_end = e;
SearchStep::Match(s, e)
} else {
self.next_match = Some((s, e));
let last = self.last_step_end;
self.last_step_end = s;
SearchStep::Reject(last, s)
}
}
}
}
}