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Introduce Patch::transform_old

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This commit is contained in:
Antonio Scandurra 2022-03-25 14:28:38 +01:00
parent ccc276da7a
commit eefaa86750
1 changed files with 46 additions and 20 deletions
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66
crates/text/src/patch.rs
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@ -199,6 +199,28 @@ where
self.0.push(edit);
}
}
pub fn transform_old(&self, old: T) -> T {
let ix = match self.0.binary_search_by(|probe| probe.old.start.cmp(&old)) {
Ok(ix) => ix,
Err(ix) => {
if ix == 0 {
return old;
} else {
ix - 1
}
}
};
if let Some(edit) = self.0.get(ix) {
if old >= edit.old.end {
edit.new.end + (old - edit.old.end)
} else {
edit.new.start
}
} else {
old
}
}
}
impl<T: Clone> IntoIterator for Patch<T> {
@ -399,26 +421,6 @@ mod tests {
);
}
// #[test]
// fn test_compose_edits() {
// assert_eq!(
// compose_edits(
// &Edit {
// old: 3..3,
// new: 3..6,
// },
// &Edit {
// old: 2..7,
// new: 2..4,
// },
// ),
// Edit {
// old: 2..4,
// new: 2..4
// }
// );
// }
#[gpui::test]
fn test_two_new_edits_touching_one_old_edit() {
assert_patch_composition(
@ -455,6 +457,30 @@ mod tests {
);
}
#[gpui::test]
fn test_transform_old() {
let patch = Patch(vec![
Edit {
old: 2..4,
new: 2..4,
},
Edit {
old: 7..8,
new: 7..11,
},
]);
assert_eq!(patch.transform_old(0), 0);
assert_eq!(patch.transform_old(1), 1);
assert_eq!(patch.transform_old(2), 2);
assert_eq!(patch.transform_old(3), 2);
assert_eq!(patch.transform_old(4), 4);
assert_eq!(patch.transform_old(5), 5);
assert_eq!(patch.transform_old(6), 6);
assert_eq!(patch.transform_old(7), 7);
assert_eq!(patch.transform_old(8), 11);
assert_eq!(patch.transform_old(9), 12);
}
#[gpui::test(iterations = 100)]
fn test_random_patch_compositions(mut rng: StdRng) {
let operations = env::var("OPERATIONS")