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This commit is contained in:
Antonio Scandurra 2021-11-11 19:49:01 +01:00
parent 4fecab6d4b
commit d75f415b25
1 changed files with 59 additions and 38 deletions
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97
crates/editor/src/display_map/patch.rs
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@ -8,52 +8,73 @@ struct Patch(Vec<Edit>);
impl Patch {
fn compose(&self, new: &Self) -> Patch {
let mut composed = Vec::new();
let mut new_edits = new.0.iter().cloned().peekable();
let mut old_edits = self.0.iter().cloned().peekable();
let mut old_delta = 0;
let mut new_delta = 0;
for mut old_edit in self.0.iter().cloned() {
let old_edit_new_start = old_edit.new.start;
let old_edit_new_end = old_edit.new.end;
let mut next_new_delta = new_delta;
while let Some(mut new_edit) = new_edits.peek().cloned() {
let new_edit_delta = new_edit.new.len() as i32 - new_edit.old.len() as i32;
if new_edit.old.end < old_edit_new_start {
new_edit.old.start = (new_edit.old.start as i32 - old_delta) as u32;
new_edit.old.end = (new_edit.old.end as i32 - old_delta) as u32;
new_edits.next();
new_delta += new_edit_delta;
next_new_delta += new_edit_delta;
composed.push(new_edit);
} else if new_edit.old.start <= old_edit_new_end {
if new_edit.old.start < old_edit_new_start {
old_edit.old.start -= old_edit_new_start - new_edit.old.start;
old_edit.new.start -= old_edit_new_start - new_edit.old.start;
for mut new_edit in new.0.iter().cloned() {
while let Some(mut old_edit) = old_edits.peek().cloned() {
if old_edit.new.end < new_edit.old.start {
old_edit.new.start = (old_edit.new.start as i32 + new_delta) as u32;
old_edit.new.end = (old_edit.new.end as i32 + new_delta) as u32;
old_edits.next();
composed.push(old_edit);
} else if old_edit.new.start < new_edit.old.end {
if old_edit.new.start < new_edit.old.start {
new_edit.old.start -= new_edit.old.start - old_edit.new.start;
new_edit.new.start -= new_edit.old.start - old_edit.new.start;
}
if new_edit.old.end > old_edit_new_end {
old_edit.old.end += new_edit.old.end - old_edit_new_end;
old_edit.new.end += new_edit.old.end - old_edit_new_end;
if old_edit.new.end > new_edit.old.end {
new_edit.old.end += old_edit.new.end - new_edit.old.end;
new_edit.new.end += old_edit.new.end - new_edit.old.end;
}
old_edit.new.end = (old_edit.new.end as i32 + new_edit_delta) as u32;
new_edits.next();
next_new_delta += new_edit_delta;
} else {
break;
}
}
old_edit.new.start = (old_edit.new.start as i32 + new_delta) as u32;
old_edit.new.end = (old_edit.new.end as i32 + new_delta) as u32;
old_delta += old_edit.new.len() as i32 - old_edit.old.len() as i32;
new_delta = next_new_delta;
composed.push(old_edit);
}
composed.extend(new_edits.map(|mut new_edit| {
new_edit.old.start = (new_edit.old.start as i32 - old_delta) as u32;
new_edit.old.end = (new_edit.old.end as i32 - old_delta) as u32;
new_edit
}));
todo!();
// for mut old_edit in self.0.iter().cloned() {
// let old_edit_new_start = old_edit.new.start;
// let old_edit_new_end = old_edit.new.end;
// let mut next_new_delta = new_delta;
// while let Some(mut new_edit) = new_edits.peek().cloned() {
// let new_edit_delta = new_edit.new.len() as i32 - new_edit.old.len() as i32;
// if new_edit.old.end < old_edit_new_start {
// new_edit.old.start = (new_edit.old.start as i32 - old_delta) as u32;
// new_edit.old.end = (new_edit.old.end as i32 - old_delta) as u32;
// new_edits.next();
// new_delta += new_edit_delta;
// next_new_delta += new_edit_delta;
// composed.push(new_edit);
// } else if new_edit.old.start <= old_edit_new_end {
// if new_edit.old.start < old_edit_new_start {
// old_edit.old.start -= old_edit_new_start - new_edit.old.start;
// old_edit.new.start -= old_edit_new_start - new_edit.old.start;
// }
// if new_edit.old.end > old_edit_new_end {
// old_edit.old.end += new_edit.old.end - old_edit_new_end;
// old_edit.new.end += new_edit.old.end - old_edit_new_end;
// }
// old_edit.new.end = (old_edit.new.end as i32 + new_edit_delta) as u32;
// new_edits.next();
// next_new_delta += new_edit_delta;
// } else {
// break;
// }
// }
// old_edit.new.start = (old_edit.new.start as i32 + new_delta) as u32;
// old_edit.new.end = (old_edit.new.end as i32 + new_delta) as u32;
// old_delta += old_edit.new.len() as i32 - old_edit.old.len() as i32;
// new_delta = next_new_delta;
// composed.push(old_edit);
// }
// composed.extend(new_edits.map(|mut new_edit| {
// new_edit.old.start = (new_edit.old.start as i32 - old_delta) as u32;
// new_edit.old.end = (new_edit.old.end as i32 - old_delta) as u32;
// new_edit
// }));
Patch(composed)
}