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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>
107 lines
3.8 KiB
Rust
107 lines
3.8 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 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::{CssRuleType, CssRuleTypes, CssRules};
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use crate::dom::bindings::codegen::Bindings::CSSGroupingRuleBinding::CSSGroupingRuleMethods;
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use crate::dom::bindings::error::{ErrorResult, Fallible};
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use crate::dom::bindings::inheritance::Castable;
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use crate::dom::bindings::reflector::DomGlobal;
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use crate::dom::bindings::root::{DomRoot, MutNullableDom};
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use crate::dom::bindings::str::DOMString;
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use crate::dom::cssconditionrule::CSSConditionRule;
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use crate::dom::csslayerblockrule::CSSLayerBlockRule;
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use crate::dom::cssrule::CSSRule;
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use crate::dom::cssrulelist::{CSSRuleList, RulesSource};
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use crate::dom::cssstylerule::CSSStyleRule;
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use crate::dom::cssstylesheet::CSSStyleSheet;
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use crate::script_runtime::CanGc;
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#[dom_struct]
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pub(crate) struct CSSGroupingRule {
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cssrule: CSSRule,
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rulelist: MutNullableDom<CSSRuleList>,
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}
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impl CSSGroupingRule {
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pub(crate) fn new_inherited(parent_stylesheet: &CSSStyleSheet) -> CSSGroupingRule {
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CSSGroupingRule {
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cssrule: CSSRule::new_inherited(parent_stylesheet),
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rulelist: MutNullableDom::new(None),
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}
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}
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fn rulelist(&self, can_gc: CanGc) -> DomRoot<CSSRuleList> {
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let parent_stylesheet = self.upcast::<CSSRule>().parent_stylesheet();
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self.rulelist.or_init(|| {
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let rules = if let Some(rule) = self.downcast::<CSSConditionRule>() {
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rule.clone_rules()
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} else if let Some(rule) = self.downcast::<CSSLayerBlockRule>() {
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rule.clone_rules()
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} else if let Some(rule) = self.downcast::<CSSStyleRule>() {
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rule.ensure_rules()
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} else {
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unreachable!()
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};
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CSSRuleList::new(
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self.global().as_window(),
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parent_stylesheet,
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RulesSource::Rules(rules),
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can_gc,
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)
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})
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}
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pub(crate) fn parent_stylesheet(&self) -> &CSSStyleSheet {
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self.cssrule.parent_stylesheet()
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}
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pub(crate) fn shared_lock(&self) -> &SharedRwLock {
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self.cssrule.shared_lock()
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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<CssRules>>,
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guard: &SharedRwLockReadGuard,
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) {
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if let Some(rulelist) = self.rulelist.get() {
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rulelist.update_rules(RulesSource::Rules(rules.clone()), guard);
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}
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}
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}
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impl CSSGroupingRuleMethods<crate::DomTypeHolder> for CSSGroupingRule {
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// https://drafts.csswg.org/cssom/#dom-cssgroupingrule-cssrules
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fn CssRules(&self, can_gc: CanGc) -> DomRoot<CSSRuleList> {
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// XXXManishearth check origin clean flag
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self.rulelist(can_gc)
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}
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// https://drafts.csswg.org/cssom/#dom-cssgroupingrule-insertrule
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fn InsertRule(&self, rule: DOMString, index: u32, can_gc: CanGc) -> Fallible<u32> {
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// TODO: this should accumulate the rule types of all ancestors.
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let rule_type = self.cssrule.as_specific().ty();
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let containing_rule_types = CssRuleTypes::from(rule_type);
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let parse_relative_rule_type = match rule_type {
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CssRuleType::Style | CssRuleType::Scope => Some(rule_type),
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_ => None,
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};
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self.rulelist(can_gc).insert_rule(
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&rule,
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index,
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containing_rule_types,
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parse_relative_rule_type,
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can_gc,
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)
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}
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// https://drafts.csswg.org/cssom/#dom-cssgroupingrule-deleterule
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fn DeleteRule(&self, index: u32, can_gc: CanGc) -> ErrorResult {
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self.rulelist(can_gc).remove_rule(index)
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}
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}
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