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For duplicate style sheets with identical content, `StylesheetContents` can be reused to avoid redundant parsing of the inline style sheets. Since duplicate stylesheets is a common case with web components, this change will significantly improve performance. Additionally, the cache hit rate of stylo's `CascadeDataCache` can now be significantly improved. When shared `StylesheetContents` is modified, copy-on-write will occur to avoid affecting other sharers. And then updates the references to `CssRule` or `PropertyDeclarationBlock` stored in the CSSOMs to ensure that modifications are made only on the new copy. Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::cell::RefCell;
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use dom_struct::dom_struct;
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use servo_arc::Arc;
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use style::shared_lock::{Locked, SharedRwLock, SharedRwLockReadGuard};
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use style::stylesheets::CssRules as StyleCssRules;
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use crate::dom::bindings::codegen::Bindings::CSSConditionRuleBinding::CSSConditionRuleMethods;
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use crate::dom::bindings::inheritance::Castable;
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use crate::dom::bindings::str::DOMString;
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use crate::dom::cssgroupingrule::CSSGroupingRule;
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use crate::dom::cssmediarule::CSSMediaRule;
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use crate::dom::cssstylesheet::CSSStyleSheet;
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use crate::dom::csssupportsrule::CSSSupportsRule;
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#[dom_struct]
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pub(crate) struct CSSConditionRule {
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cssgroupingrule: CSSGroupingRule,
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#[ignore_malloc_size_of = "Arc"]
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#[no_trace]
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rules: RefCell<Arc<Locked<StyleCssRules>>>,
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}
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impl CSSConditionRule {
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pub(crate) fn new_inherited(
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parent_stylesheet: &CSSStyleSheet,
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rules: Arc<Locked<StyleCssRules>>,
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) -> CSSConditionRule {
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CSSConditionRule {
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cssgroupingrule: CSSGroupingRule::new_inherited(parent_stylesheet),
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rules: RefCell::new(rules),
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}
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}
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pub(crate) fn parent_stylesheet(&self) -> &CSSStyleSheet {
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self.cssgroupingrule.parent_stylesheet()
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}
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pub(crate) fn shared_lock(&self) -> &SharedRwLock {
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self.cssgroupingrule.shared_lock()
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}
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pub(crate) fn clone_rules(&self) -> Arc<Locked<StyleCssRules>> {
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self.rules.borrow().clone()
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}
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pub(crate) fn update_rules(
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&self,
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rules: Arc<Locked<StyleCssRules>>,
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guard: &SharedRwLockReadGuard,
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) {
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self.cssgroupingrule.update_rules(&rules, guard);
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*self.rules.borrow_mut() = rules;
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}
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}
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impl CSSConditionRuleMethods<crate::DomTypeHolder> for CSSConditionRule {
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/// <https://drafts.csswg.org/css-conditional-3/#dom-cssconditionrule-conditiontext>
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fn ConditionText(&self) -> DOMString {
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if let Some(rule) = self.downcast::<CSSMediaRule>() {
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rule.get_condition_text()
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} else if let Some(rule) = self.downcast::<CSSSupportsRule>() {
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rule.get_condition_text()
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} else {
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unreachable!()
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}
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}
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}
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