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44e4ea3d7a
This makes cascade layer filtering take <2% of CPU time when loading https://vercel.com instead of 30%.
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
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* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CSSLayerBlockRule.h"
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#include <LibWeb/Bindings/CSSLayerBlockRulePrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/Serialize.h>
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namespace Web::CSS {
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JS_DEFINE_ALLOCATOR(CSSLayerBlockRule);
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JS::NonnullGCPtr<CSSLayerBlockRule> CSSLayerBlockRule::create(JS::Realm& realm, FlyString name, CSSRuleList& rules)
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{
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return realm.heap().allocate<CSSLayerBlockRule>(realm, realm, move(name), rules);
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}
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FlyString CSSLayerBlockRule::next_unique_anonymous_layer_name()
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{
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static u64 s_anonymous_layer_id = 0;
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return MUST(String::formatted("#{}", ++s_anonymous_layer_id));
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}
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CSSLayerBlockRule::CSSLayerBlockRule(JS::Realm& realm, FlyString name, CSSRuleList& rules)
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: CSSGroupingRule(realm, rules)
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, m_name(move(name))
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{
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if (m_name.is_empty()) {
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m_name_internal = next_unique_anonymous_layer_name();
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} else {
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m_name_internal = m_name;
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}
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}
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void CSSLayerBlockRule::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSLayerBlockRule);
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}
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String CSSLayerBlockRule::serialized() const
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{
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// AD-HOC: No spec yet, so this is based on the @media serialization algorithm.
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StringBuilder builder;
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builder.append("@layer"sv);
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if (!m_name.is_empty())
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builder.appendff(" {}", m_name);
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builder.append(" {\n"sv);
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// AD-HOC: All modern browsers omit the ending newline if there are no CSS rules, so let's do the same.
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if (css_rules().length() == 0) {
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builder.append('}');
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return builder.to_string_without_validation();
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}
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for (size_t i = 0; i < css_rules().length(); i++) {
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auto rule = css_rules().item(i);
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if (i != 0)
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builder.append("\n"sv);
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builder.append(" "sv);
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builder.append(rule->css_text());
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}
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builder.append("\n}"sv);
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return builder.to_string_without_validation();
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}
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FlyString CSSLayerBlockRule::internal_qualified_name(Badge<StyleComputer>) const
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{
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auto const& parent_name = parent_layer_internal_qualified_name();
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if (parent_name.is_empty())
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return m_name_internal;
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return MUST(String::formatted("{}.{}", parent_name, m_name_internal));
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}
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}
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