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use bstr::ByteSlice;
/// An iterator over line-wise ignore patterns parsed from a buffer.
pub struct Lines<'a> {
lines: bstr::Lines<'a>,
line_no: usize,
}
impl<'a> Lines<'a> {
/// Create a new instance from `buf` to parse ignore patterns from.
pub fn new(buf: &'a [u8]) -> Self {
let bom = unicode_bom::Bom::from(buf);
Lines {
lines: buf[bom.len()..].lines(),
line_no: 0,
}
}
}
impl<'a> Iterator for Lines<'a> {
type Item = (gix_glob::Pattern, usize);
fn next(&mut self) -> Option<Self::Item> {
for line in self.lines.by_ref() {
self.line_no += 1;
if line.first() == Some(&b'#') {
continue;
}
match gix_glob::Pattern::from_bytes(truncate_non_escaped_trailing_spaces(line)) {
None => continue,
Some(pattern) => return Some((pattern, self.line_no)),
}
}
None
}
}
/// We always copy just because that's ultimately needed anyway, not because we always have to.
fn truncate_non_escaped_trailing_spaces(buf: &[u8]) -> &[u8] {
let mut last_space_pos = None;
let mut bytes = buf.iter().enumerate();
while let Some((pos, b)) = bytes.next() {
match *b {
b' ' => {
last_space_pos.get_or_insert(pos);
continue;
}
b'\\' => {
if bytes.next().is_none() {
return buf;
}
}
_ => {}
}
last_space_pos = None;
}
if let Some(pos) = last_space_pos {
&buf[..pos]
} else {
buf
}
}
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