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