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fix: correct extend_to logic in parser

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Previously we swapped to events in the buffer, but that might be wrong
if there aer `forward_parent` links pointing to the swapped-out node.

Let's do the same via parent links instead, keeping the nodes in place
This commit is contained in:
Aleksey Kladov 2021-09-25 19:11:45 +03:00
parent 6997adfee7
commit 7dc331faef
2 changed files with 11 additions and 9 deletions
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6
crates/parser/src/event.rs
View file

@ -93,8 +93,6 @@ pub(super) fn process(sink: &mut dyn TreeSink, mut events: Vec<Event>) {
for i in 0..events.len() {
match mem::replace(&mut events[i], Event::tombstone()) {
Event::Start { kind: TOMBSTONE, .. } => (),
Event::Start { kind, forward_parent } => {
// For events[A, B, C], B is A's forward_parent, C is B's forward_parent,
// in the normal control flow, the parent-child relation: `A -> B -> C`,
@ -109,9 +107,7 @@ pub(super) fn process(sink: &mut dyn TreeSink, mut events: Vec<Event>) {
// append `A`'s forward_parent `B`
fp = match mem::replace(&mut events[idx], Event::tombstone()) {
Event::Start { kind, forward_parent } => {
if kind != TOMBSTONE {
forward_parents.push(kind);
}
forward_parent
}
_ => unreachable!(),
@ -120,9 +116,11 @@ pub(super) fn process(sink: &mut dyn TreeSink, mut events: Vec<Event>) {
}
for kind in forward_parents.drain(..).rev() {
if kind != TOMBSTONE {
sink.start_node(kind);
}
}
}
Event::Finish => sink.finish_node(),
Event::Token { kind, n_raw_tokens } => {
sink.token(kind, n_raw_tokens);

10
crates/parser/src/parser.rs
View file

@ -340,10 +340,14 @@ impl CompletedMarker {
/// Extends this completed marker *to the left* up to `m`.
pub(crate) fn extend_to(self, p: &mut Parser, mut m: Marker) {
assert!(m.pos <= self.pos);
m.bomb.defuse();
p.events.swap(self.pos as usize, m.pos as usize);
let idx = m.pos as usize;
match &mut p.events[idx] {
Event::Start { forward_parent, .. } => {
*forward_parent = Some(self.pos - m.pos);
}
_ => unreachable!(),
}
}
pub(crate) fn kind(&self) -> SyntaxKind {