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Use Vec::reserve in PropertyDeclarationBlock

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This commit is contained in:
Simon Sapin 2017-05-19 18:09:00 +02:00
parent d2be5239f5
commit cb8f77891f
1 changed files with 10 additions and 0 deletions
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10
components/style/properties/declaration_block.rs
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@ -218,6 +218,16 @@ impl PropertyDeclarationBlock {
fn extend_common(&mut self, mut drain: SourcePropertyDeclarationDrain,
importance: Importance, overwrite_more_important: bool) -> bool {
let all_shorthand_len = match drain.all_shorthand {
AllShorthand::NotSet => 0,
AllShorthand::CSSWideKeyword(_) |
AllShorthand::WithVariables(_) => ShorthandId::All.longhands().len()
};
let push_calls_count = drain.declarations.len() + all_shorthand_len;
// With deduplication the actual length increase may be less than this.
self.declarations.reserve(push_calls_count);
let mut changed = false;
for decl in &mut drain.declarations {
changed |= self.push_common(decl, importance, overwrite_more_important);