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perf(css/minifier): Improve performance (#6583)

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Donny/강동윤 2022-12-06 22:04:34 +09:00 committed by GitHub
parent 824979f92b
commit 78955995a2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 21 additions and 10 deletions
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31
crates/swc_css_minifier/src/compressor/rules.rs
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@ -482,12 +482,23 @@ impl Compressor {
pub(super) fn compress_simple_block(&mut self, simple_block: &mut SimpleBlock) {
let mut names: AHashMap<Name, isize> = Default::default();
let mut prev_rule: Option<ComponentValue> = None;
let mut prev_rule_idx = None;
let mut remove_rules_list = vec![];
let mut prev_index = 0;
let mut index = 0;
simple_block.value.retain_mut(|rule| {
for index in 0..simple_block.value.len() {
// We need two &mut
let (a, b) = simple_block.value.split_at_mut(index);
let mut prev_rule = match prev_rule_idx {
Some(idx) => a.get_mut(idx),
None => None,
};
let rule = match b.first_mut() {
Some(v) => v,
None => continue,
};
let result = match rule {
ComponentValue::Rule(box Rule::AtRule(box AtRule {
block: Some(block), ..
@ -600,24 +611,24 @@ impl Compressor {
if self.is_mergeable_at_rule(at_rule) =>
{
prev_index = index;
prev_rule = Some(rule.clone());
prev_rule_idx = Some(index);
}
ComponentValue::Rule(box Rule::QualifiedRule(_))
| ComponentValue::StyleBlock(box StyleBlock::QualifiedRule(_)) => {
prev_index = index;
prev_rule = Some(rule.clone());
prev_rule_idx = Some(index);
}
_ => {
prev_rule = None;
prev_rule_idx = None;
}
}
index += 1;
}
result
});
if !result {
remove_rules_list.push(index);
}
}
if !names.is_empty() {
self.discard_overridden(