dan/oxc
1
0
Fork 0
mirror of https://github.com/danbulant/oxc synced 2026-05-24 20:32:10 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

perf(lexer): improve comment building performance by using a vec instead of btreemap (#3186)

Browse source 
closes #2693
This commit is contained in:
Boshen 2024-05-07 16:43:27 +08:00 committed by GitHub
parent b66d578fed
commit 7338364219
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 17 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
crates/oxc_parser/src/lexer/trivia_builder.rs
View file

@ -1,28 +1,38 @@
use std::collections::BTreeMap;
use oxc_ast::{Comment, CommentKind, Trivias};
use oxc_ast::{Comment, CommentKind, Trivias, TriviasMap};
use oxc_span::Span;
#[derive(Debug, Default)]
pub struct TriviaBuilder {
// Duplicated comments can be added from rewind, use `BTreeMap` to ensure uniqueness
comments: BTreeMap<u32, Comment>,
comments: Vec<(u32, Comment)>,
irregular_whitespaces: Vec<Span>,
}
impl TriviaBuilder {
pub fn build(self) -> Trivias {
Trivias::new(self.comments, self.irregular_whitespaces)
let comments = TriviasMap::from_iter(self.comments);
Trivias::new(comments, self.irregular_whitespaces)
}
pub fn add_single_line_comment(&mut self, start: u32, end: u32) {
// skip leading `//`
self.comments.insert(start + 2, Comment::new(end, CommentKind::SingleLine));
self.add_comment(start + 2, Comment::new(end, CommentKind::SingleLine));
}
pub fn add_multi_line_comment(&mut self, start: u32, end: u32) {
// skip leading `/*` and trailing `*/`
self.comments.insert(start + 2, Comment::new(end - 2, CommentKind::MultiLine));
self.add_comment(start + 2, Comment::new(end - 2, CommentKind::MultiLine));
}
fn add_comment(&mut self, start: u32, comment: Comment) {
// The comments array is an ordered vec, only add the comment if its not added before,
// to avoid situations where the parser needs to rewind and reinsert the comment.
if let Some(comment) = self.comments.last_mut() {
if start <= comment.0 {
return;
}
}
self.comments.push((start, comment));
}
pub fn add_irregular_whitespace(&mut self, start: u32, end: u32) {