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use std::convert::Infallible;
use crate::algorithms::DiffHook;
use crate::{group_diff_ops, DiffOp};
/// A [`DiffHook`] that captures all diff operations.
#[derive(Default, Clone)]
pub struct Capture(Vec<DiffOp>);
impl Capture {
/// Creates a new capture hook.
pub fn new() -> Capture {
Capture::default()
}
/// Converts the capture hook into a vector of ops.
pub fn into_ops(self) -> Vec<DiffOp> {
self.0
}
/// Isolate change clusters by eliminating ranges with no changes.
///
/// This is equivalent to calling [`group_diff_ops`] on [`Capture::into_ops`].
pub fn into_grouped_ops(self, n: usize) -> Vec<Vec<DiffOp>> {
group_diff_ops(self.into_ops(), n)
}
/// Accesses the captured operations.
pub fn ops(&self) -> &[DiffOp] {
&self.0
}
}
impl DiffHook for Capture {
type Error = Infallible;
#[inline(always)]
fn equal(&mut self, old_index: usize, new_index: usize, len: usize) -> Result<(), Self::Error> {
self.0.push(DiffOp::Equal {
old_index,
new_index,
len,
});
Ok(())
}
#[inline(always)]
fn delete(
&mut self,
old_index: usize,
old_len: usize,
new_index: usize,
) -> Result<(), Self::Error> {
self.0.push(DiffOp::Delete {
old_index,
old_len,
new_index,
});
Ok(())
}
#[inline(always)]
fn insert(
&mut self,
old_index: usize,
new_index: usize,
new_len: usize,
) -> Result<(), Self::Error> {
self.0.push(DiffOp::Insert {
old_index,
new_index,
new_len,
});
Ok(())
}
#[inline(always)]
fn replace(
&mut self,
old_index: usize,
old_len: usize,
new_index: usize,
new_len: usize,
) -> Result<(), Self::Error> {
self.0.push(DiffOp::Replace {
old_index,
old_len,
new_index,
new_len,
});
Ok(())
}
}
#[test]
fn test_capture_hook_grouping() {
use crate::algorithms::{diff_slices, Algorithm, Replace};
let rng = (1..100).collect::<Vec<_>>();
let mut rng_new = rng.clone();
rng_new[10] = 1000;
rng_new[13] = 1000;
rng_new[16] = 1000;
rng_new[34] = 1000;
let mut d = Replace::new(Capture::new());
diff_slices(Algorithm::Myers, &mut d, &rng, &rng_new).unwrap();
let ops = d.into_inner().into_grouped_ops(3);
let tags = ops
.iter()
.map(|group| group.iter().map(|x| x.as_tag_tuple()).collect::<Vec<_>>())
.collect::<Vec<_>>();
insta::assert_debug_snapshot!(ops);
insta::assert_debug_snapshot!(tags);
}
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