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diff: extract helper that returns texts between two UnchangedRanges

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This commit is contained in:
Yuya Nishihara 2024-09-25 15:41:19 +09:00
parent 055f15b6a8
commit e28fdac48e
1 changed files with 21 additions and 13 deletions
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34
lib/src/diff.rs
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@ -555,6 +555,21 @@ impl<'input> Diff<'input> {
}
}
/// Returns contents between the `previous` ends and the `current` starts.
fn hunk_between<'a>(
&'a self,
previous: &'a UnchangedRange,
current: &'a UnchangedRange,
) -> impl Iterator<Item = &'input BStr> + 'a {
itertools::chain(
iter::once(&self.base_input[previous.base.end..current.base.start]),
(0..current.offsets.len()).map(|i| {
let changed_range = previous.end(i)..current.start(i);
&self.other_inputs[i][changed_range]
}),
)
}
/// Uses the given tokenizer to split the changed regions into smaller
/// regions. Then tries to finds unchanged regions among them.
pub fn refine_changed_regions(&mut self, tokenizer: impl Fn(&[u8]) -> Vec<Range<usize>>) {
@ -568,14 +583,8 @@ impl<'input> Diff<'input> {
// create a new Diff instance. Then adjust the start positions and
// offsets to be valid in the context of the larger Diff instance
// (`self`).
let mut slices = vec![&self.base_input[previous.base.end..current.base.start]];
for i in 0..current.offsets.len() {
let changed_range = previous.end(i)..current.start(i);
slices.push(&self.other_inputs[i][changed_range]);
}
let refined_diff = Diff::for_tokenizer(slices, &tokenizer);
let refined_diff =
Diff::for_tokenizer(self.hunk_between(&previous, current), &tokenizer);
for refined in refined_diff.unchanged_regions {
let new_base_start = refined.base.start + previous.base.end;
let new_base_end = refined.base.end + previous.base.end;
@ -660,11 +669,10 @@ impl<'diff, 'input> Iterator for DiffHunkIterator<'diff, 'input> {
}
}
if let Some(current) = self.unchanged_iter.next() {
let mut slices =
vec![&self.diff.base_input[self.previous.base.end..current.base.start]];
for (i, input) in self.diff.other_inputs.iter().enumerate() {
slices.push(&input[self.previous.end(i)..current.start(i)]);
}
let slices = self
.diff
.hunk_between(&self.previous, current)
.collect_vec();
self.previous = current.clone();
self.unchanged_emitted = false;
if slices.iter().any(|slice| !slice.is_empty()) {