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use crate::{StringIter, pattern::{Pattern, Never, Sep}};
impl Sep {
#[inline]
pub(crate) fn is_yielded(&self) -> bool {
matches!(self, Sep::Yield|Sep::Conjoin)
}
#[inline]
pub(crate) fn is_retained(&self) -> bool {
matches!(self, Sep::Retain|Sep::Conjoin)
}
}
impl<'t> StringIter<'t> {
/// Obtain the contents of the StringIter, leaving it empty.
pub fn drain(&mut self) -> &'t str {
let result = self.str;
let len = self.len();
// to be extra safe with merge() in the crate
self.str = &self.str[len..len];
result
}
/// Gets a slice out of a StringIter
/// using a fallible pattern.
///
/// If Err is [`Never`], you can use
/// [the infallible version](crate::StringIter::next_slice) instead.
///
/// The iterator will not be changed if the match fails.
///
/// # Pattern
///
/// see [supported patterns](crate#supported-patterns)
///
/// # Pattern Configuration
///
/// see [`SetSep`](crate::SetSep)
pub fn try_next_slice<P: Pattern>(&mut self, mut pat: P) -> Result<Option<&'t str>, P::Err> {
if self.len() == 0{
return Ok(None);
}
let mut index = self.len();
let mut char_len = 0;
if pat.len().get() == 1{
for (c, s) in self.clone(){
if pat.matches(c, s)? {
index = s.as_ptr() as usize - self.str.as_ptr() as usize;
char_len = s.len();
break;
}
}
} else {
for (c, s) in self.clone().look_ahead(pat.len().get()){
if pat.matches(c, s)? {
index = s.as_ptr() as usize - self.str.as_ptr() as usize;
char_len = c.len_utf8();
break;
}
}
}
unsafe{
let result = if pat.sep().is_yielded() {
self.str.get_unchecked(..index + char_len)
} else {
self.str.get_unchecked(..index)
};
if pat.sep().is_retained() {
self.str = self.str.get_unchecked(index..);
} else {
self.str = self.str.get_unchecked(index + char_len..);
}
Ok(Some(result))
}
}
/// Gets a slice from a StringIter in reverse,
/// using a fallible pattern.
///
/// If Err is [`Never`], you can use
/// [the infallible version](crate::StringIter::next_slice_back) instead.
///
/// The iterator will not be changed if the match fails.
///
/// See [try_next_slice](crate::StringIter::try_next_slice)
pub fn try_next_slice_back<P: Pattern>(&mut self, mut pat: P) -> Result<Option<&'t str>, P::Err> {
if self.len() == 0{
return Ok(None);
}
let mut index = self.len();
let mut char_len = 0;
if pat.len().get() == 1{
for (c, s) in self.clone().rev(){
if pat.matches(c, s)? {
index = s.as_ptr() as usize - self.str.as_ptr() as usize;
char_len = s.len();
break;
}
}
} else {
for (c, s) in self.clone().look_ahead(pat.len().get()).rev(){
if pat.matches(c, s)? {
index = s.as_ptr() as usize - self.str.as_ptr() as usize;
char_len = c.len_utf8();
break;
}
}
}
for (c, s) in self.clone().rev(){
if pat.matches(c, s)? {
index = s.as_ptr() as usize - self.str.as_ptr() as usize;
char_len = s.len();
break;
}
}
unsafe{
let result = if pat.sep().is_yielded() {
self.str.get_unchecked(index..)
} else {
self.str.get_unchecked(index + char_len..)
};
if pat.sep().is_retained() {
self.str = self.str.get_unchecked(..index + char_len);
} else {
self.str = self.str.get_unchecked(..index);
}
Ok(Some(result))
}
}
/// Gets a slice from a StringIter,
/// using a non-fallible pattern.
///
/// See [try_next_slice](crate::StringIter::try_next_slice)
#[inline]
pub fn next_slice<P: Pattern<Err = Never>> (&mut self, pat: P) -> Option<&'t str> {
self.try_next_slice(pat).unwrap()
}
/// Gets a slice from a StringIter in reverse,
/// using a non-fallible pattern.
///
/// See [try_next_slice](crate::StringIter::try_next_slice)
#[inline]
pub fn next_slice_back<P: Pattern<Err = Never>> (&mut self, pat: P) -> Option<&'t str> {
self.try_next_slice_back(pat).unwrap()
}
}