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Revert "Avoid nested replacement ranges" from #129346. #132587

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merged 1 commit into from
Nov 5, 2024
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Revert "Avoid nested replacement ranges" from #129346. #132587

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28 changes: 21 additions & 7 deletions compiler/rustc_parse/src/parser/attr_wrapper.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -136,17 +136,30 @@ impl ToAttrTokenStream for LazyAttrTokenStreamImpl {
node_replacements.array_windows()
{
assert!(
node_range.0.end <= next_node_range.0.start,
"Node ranges should be disjoint: ({:?}, {:?}) ({:?}, {:?})",
node_range.0.end <= next_node_range.0.start
|| node_range.0.end >= next_node_range.0.end,
"Node ranges should be disjoint or nested: ({:?}, {:?}) ({:?}, {:?})",
node_range,
tokens,
next_node_range,
next_tokens,
);
}

// Process the replace ranges.
for (node_range, target) in node_replacements.into_iter() {
// Process the replace ranges, starting from the highest start
// position and working our way back. If have tokens like:
//
// `#[cfg(FALSE)] struct Foo { #[cfg(FALSE)] field: bool }`
//
// Then we will generate replace ranges for both
// the `#[cfg(FALSE)] field: bool` and the entire
// `#[cfg(FALSE)] struct Foo { #[cfg(FALSE)] field: bool }`
//
// By starting processing from the replace range with the greatest
// start position, we ensure that any (outer) replace range which
// encloses another (inner) replace range will fully overwrite the
// inner range's replacement.
for (node_range, target) in node_replacements.into_iter().rev() {
assert!(
!node_range.0.is_empty(),
"Cannot replace an empty node range: {:?}",
Expand Down Expand Up @@ -383,9 +396,10 @@ impl<'a> Parser<'a> {
// from `ParserRange` form to `NodeRange` form. We will perform the actual
// replacement only when we convert the `LazyAttrTokenStream` to an
// `AttrTokenStream`.
self.capture_state
.parser_replacements
.drain(parser_replacements_start..parser_replacements_end)
self.capture_state.parser_replacements
[parser_replacements_start..parser_replacements_end]
.iter()
.cloned()
.chain(inner_attr_parser_replacements)
.map(|(parser_range, data)| {
(NodeRange::new(parser_range, collect_pos.start_pos), data)
Expand Down
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