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fix: parser performance issues #307

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merged 1 commit into from
Feb 5, 2021
Merged

fix: parser performance issues #307

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64 changes: 31 additions & 33 deletions crates/mun_syntax/src/parsing/event.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -54,45 +54,43 @@ impl Event {
pub(super) fn process(sink: &mut dyn TreeSink, mut events: Vec<Event>) {
let mut forward_parents = Vec::new();

for _i in 0..events.len() {
for i in 0..events.len() {
match mem::replace(&mut events[i], Event::tombstone()) {
Event::Start {
kind: TOMBSTONE, ..
} => (),
Event::Start {
kind,
forward_parent,
} => {
forward_parents.push(kind);
let mut idx = i;
let mut fp = forward_parent;
while let Some(fwd) = fp {
idx += fwd as usize;
fp = match mem::replace(&mut events[idx], Event::tombstone()) {
Event::Start {
kind,
forward_parent,
} => {
if kind != TOMBSTONE {
forward_parents.push(kind);
}
forward_parent
for i in 0..events.len() {
match mem::replace(&mut events[i], Event::tombstone()) {
Event::Start {
kind: TOMBSTONE, ..
} => (),
Event::Start {
kind,
forward_parent,
} => {
forward_parents.push(kind);
let mut idx = i;
let mut fp = forward_parent;
while let Some(fwd) = fp {
idx += fwd as usize;
fp = match mem::replace(&mut events[idx], Event::tombstone()) {
Event::Start {
kind,
forward_parent,
} => {
if kind != TOMBSTONE {
forward_parents.push(kind);
}
_ => unreachable!(),
forward_parent
}
}

for kind in forward_parents.drain(..).rev() {
sink.start_node(kind)
_ => unreachable!(),
}
}
Event::Finish => sink.finish_node(),
Event::Token { kind, n_raw_tokens } => {
sink.token(kind, n_raw_tokens);

for kind in forward_parents.drain(..).rev() {
sink.start_node(kind)
}
Event::Error { msg } => sink.error(msg),
}
Event::Finish => sink.finish_node(),
Event::Token { kind, n_raw_tokens } => {
sink.token(kind, n_raw_tokens);
}
Event::Error { msg } => sink.error(msg),
}
}
}