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transaction: Also modify map_pos to work with insert|delete order.

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This commit is contained in:
Blaž Hrastnik 2021-02-18 12:17:33 +09:00
parent d5f9622e2e
commit af55ebd002
1 changed files with 27 additions and 27 deletions
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54
helix-core/src/transaction.rs
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@ -335,7 +335,7 @@ impl ChangeSet {
Delete(i) | Retain(i) => *i,
Insert(_) => 0,
};
let old_end = old_pos + len;
let mut old_end = old_pos + len;
match change {
Retain(_) => {
@ -345,37 +345,37 @@ impl ChangeSet {
new_pos += len;
}
Delete(_) => {
// a subsequent ins means a replace, consume it
let ins = if let Some(Insert(s)) = iter.peek() {
iter.next();
s.chars().count()
} else {
0
};
// in range
if old_end > pos {
// at point or tracking before
if pos == old_pos || assoc == Assoc::Before {
return new_pos;
} else {
// place to end of delete
return new_pos + ins;
}
return new_pos;
}
new_pos += ins;
}
Insert(s) => {
let ins = s.chars().count();
// at insert point
if old_pos == pos {
// return position before inserted text
if assoc == Assoc::Before {
return new_pos;
} else {
// after text
return new_pos + ins;
// a subsequent delete means a replace, consume it
if let Some(Delete(len)) = iter.peek() {
old_end = old_pos + len;
// in range of replaced text
if old_end > pos {
// at point or tracking before
if pos == old_pos || assoc == Assoc::Before {
return new_pos;
} else {
// place to end of insert
return new_pos + ins;
}
}
} else {
// at insert point
if old_pos == pos {
// return position before inserted text
if assoc == Assoc::Before {
return new_pos;
} else {
// after text
return new_pos + ins;
}
}
}
@ -602,10 +602,10 @@ mod test {
// stays inbetween replacements
let cs = ChangeSet {
changes: vec![
Delete(2),
Insert("ab".into()),
Delete(2),
Insert("cd".into()),
Delete(2),
],
len: 4,
};