mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-04-25 05:55:13 +00:00
d762d16938
Prior to this change, we invalidated all elements in the document if it used any selectors with :has(). This change aims to improve that by applying a combination of techniques: - Collect metadata for each element if it was matched against a selector with :has() in the subject position. This is needed to invalidate all elements that could be affected by selectors like `div:has(.a:empty)` because they are not covered by the invalidation sets. - Use invalidation sets to invalidate elements that are affected by selectors with :has() in a non-subject position. Selectors like `.a:has(.b) + .c` still cause whole-document invalidation because invalidation sets cover only descendants, not siblings. As a result, there is no performance improvement on github.com due to this limitation. However, youtube.com and discord.com benefit from this change.
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
/*
|
|
* Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibWeb/CSS/Selector.h>
|
|
#include <LibWeb/DOM/Element.h>
|
|
|
|
namespace Web::SelectorEngine {
|
|
|
|
enum class SelectorKind {
|
|
Normal,
|
|
Relative,
|
|
};
|
|
|
|
struct MatchContext {
|
|
GC::Ptr<CSS::CSSStyleSheet const> style_sheet_for_rule {};
|
|
GC::Ptr<DOM::Element const> subject {};
|
|
bool collect_per_element_selector_involvement_metadata { false };
|
|
bool did_match_any_hover_rules { false };
|
|
};
|
|
|
|
bool matches(CSS::Selector const&, DOM::Element const&, GC::Ptr<DOM::Element const> shadow_host, MatchContext& context, Optional<CSS::Selector::PseudoElement::Type> = {}, GC::Ptr<DOM::ParentNode const> scope = {}, SelectorKind selector_kind = SelectorKind::Normal, GC::Ptr<DOM::Element const> anchor = nullptr);
|
|
|
|
[[nodiscard]] bool fast_matches(CSS::Selector const&, DOM::Element const&, GC::Ptr<DOM::Element const> shadow_host, MatchContext& context);
|
|
[[nodiscard]] bool can_use_fast_matches(CSS::Selector const&);
|
|
|
|
[[nodiscard]] bool matches_hover_pseudo_class(DOM::Element const&);
|
|
|
|
}
|