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refactor(visit): Simplify Vec::move_map (#8838)

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David Sherret 2024-04-10 19:00:14 -04:00 committed by GitHub
parent 67ec5e09b9
commit b1973d490a
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1 changed files with 8 additions and 13 deletions
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21
crates/swc_visit/src/util/move_map.rs
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@ -26,26 +26,21 @@ impl<T> MoveMap<T> for Vec<T> {
where
F: FnMut(T) -> T,
{
let mut read_i = 0;
let mut write_i = 0;
unsafe {
let old_len = self.len();
self.set_len(0); // make sure we just leak elements in case of panic
while read_i < old_len {
// move the read_i'th item out of the vector and map it
// to an iterator
let e = ptr::read(self.as_ptr().add(read_i));
let e = f(e);
read_i += 1;
for index in 0..old_len {
let item_ptr = self.as_mut_ptr().add(index);
// move the item out of the vector and map it
let item = ptr::read(item_ptr);
let item = f(item);
assert!(write_i < read_i);
ptr::write(self.as_mut_ptr().add(write_i), e);
write_i += 1;
ptr::write(item_ptr, item);
}
// write_i tracks the number of actually written new items.
self.set_len(write_i);
// restore the original length
self.set_len(old_len);
}
self