mirror of
https://github.com/LadybirdBrowser/ladybird.git
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219 lines
7.7 KiB
C++
219 lines
7.7 KiB
C++
/*
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* Copyright (c) 2021-2024, 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 <AK/TypeCasts.h>
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#include <LibWeb/Bindings/CSSRuleListPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/CSSImportRule.h>
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#include <LibWeb/CSS/CSSKeyframesRule.h>
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#include <LibWeb/CSS/CSSLayerBlockRule.h>
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#include <LibWeb/CSS/CSSMediaRule.h>
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#include <LibWeb/CSS/CSSRule.h>
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#include <LibWeb/CSS/CSSRuleList.h>
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#include <LibWeb/CSS/CSSSupportsRule.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/HTML/Window.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSRuleList);
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GC::Ref<CSSRuleList> CSSRuleList::create(JS::Realm& realm, GC::RootVector<CSSRule*> const& rules)
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{
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auto rule_list = realm.create<CSSRuleList>(realm);
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for (auto* rule : rules)
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rule_list->m_rules.append(*rule);
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return rule_list;
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}
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CSSRuleList::CSSRuleList(JS::Realm& realm)
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: Bindings::PlatformObject(realm)
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{
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m_legacy_platform_object_flags = LegacyPlatformObjectFlags { .supports_indexed_properties = 1 };
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}
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GC::Ref<CSSRuleList> CSSRuleList::create_empty(JS::Realm& realm)
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{
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return realm.create<CSSRuleList>(realm);
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}
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void CSSRuleList::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSRuleList);
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}
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void CSSRuleList::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_rules);
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}
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// https://www.w3.org/TR/cssom/#insert-a-css-rule
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WebIDL::ExceptionOr<unsigned> CSSRuleList::insert_a_css_rule(Variant<StringView, CSSRule*> rule, u32 index)
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{
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// 1. Set length to the number of items in list.
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auto length = m_rules.size();
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// 2. If index is greater than length, then throw an IndexSizeError exception.
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if (index > length)
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return WebIDL::IndexSizeError::create(realm(), "CSS rule index out of bounds."_string);
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// 3. Set new rule to the results of performing parse a CSS rule on argument rule.
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// NOTE: The insert-a-css-rule spec expects `rule` to be a string, but the CSSStyleSheet.insertRule()
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// spec calls this algorithm with an already-parsed CSSRule. So, we use a Variant and skip step 3
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// if that variant holds a CSSRule already.
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CSSRule* new_rule = nullptr;
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if (rule.has<StringView>()) {
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new_rule = parse_css_rule(
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CSS::Parser::ParsingContext { realm() },
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rule.get<StringView>());
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} else {
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new_rule = rule.get<CSSRule*>();
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}
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// 4. If new rule is a syntax error, throw a SyntaxError exception.
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if (!new_rule)
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return WebIDL::SyntaxError::create(realm(), "Unable to parse CSS rule."_string);
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// FIXME: 5. If new rule cannot be inserted into list at the zero-index position index due to constraints specified by CSS, then throw a HierarchyRequestError exception. [CSS21]
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// FIXME: 6. If new rule is an @namespace at-rule, and list contains anything other than @import at-rules, and @namespace at-rules, throw an InvalidStateError exception.
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// 7. Insert new rule into list at the zero-indexed position index.
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m_rules.insert(index, *new_rule);
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// 8. Return index.
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if (on_change)
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on_change();
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return index;
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}
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// https://www.w3.org/TR/cssom/#remove-a-css-rule
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WebIDL::ExceptionOr<void> CSSRuleList::remove_a_css_rule(u32 index)
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{
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// 1. Set length to the number of items in list.
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auto length = m_rules.size();
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// 2. If index is greater than or equal to length, then throw an IndexSizeError exception.
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if (index >= length)
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return WebIDL::IndexSizeError::create(realm(), "CSS rule index out of bounds."_string);
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// 3. Set old rule to the indexth item in list.
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CSSRule& old_rule = m_rules[index];
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// FIXME: 4. If old rule is an @namespace at-rule, and list contains anything other than @import at-rules, and @namespace at-rules, throw an InvalidStateError exception.
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// 5. Remove rule old rule from list at the zero-indexed position index.
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m_rules.remove(index);
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// 6. Set old rule’s parent CSS rule and parent CSS style sheet to null.
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old_rule.set_parent_rule(nullptr);
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old_rule.set_parent_style_sheet(nullptr);
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if (on_change)
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on_change();
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return {};
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}
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void CSSRuleList::for_each_effective_rule(TraversalOrder order, Function<void(Web::CSS::CSSRule const&)> const& callback) const
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{
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for (auto const& rule : m_rules) {
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if (order == TraversalOrder::Preorder)
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callback(rule);
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switch (rule->type()) {
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case CSSRule::Type::Import: {
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auto const& import_rule = static_cast<CSSImportRule const&>(*rule);
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if (import_rule.loaded_style_sheet())
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import_rule.loaded_style_sheet()->for_each_effective_rule(order, callback);
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break;
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}
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case CSSRule::Type::LayerBlock:
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case CSSRule::Type::Media:
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case CSSRule::Type::Style:
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case CSSRule::Type::Supports:
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static_cast<CSSGroupingRule const&>(*rule).for_each_effective_rule(order, callback);
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break;
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case CSSRule::Type::FontFace:
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case CSSRule::Type::Keyframe:
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case CSSRule::Type::Keyframes:
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case CSSRule::Type::LayerStatement:
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case CSSRule::Type::Namespace:
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case CSSRule::Type::NestedDeclarations:
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case CSSRule::Type::Property:
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break;
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}
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if (order == TraversalOrder::Postorder)
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callback(rule);
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}
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}
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bool CSSRuleList::evaluate_media_queries(HTML::Window const& window)
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{
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bool any_media_queries_changed_match_state = false;
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for (auto& rule : m_rules) {
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switch (rule->type()) {
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case CSSRule::Type::Import: {
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auto& import_rule = verify_cast<CSSImportRule>(*rule);
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if (import_rule.loaded_style_sheet() && import_rule.loaded_style_sheet()->evaluate_media_queries(window))
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any_media_queries_changed_match_state = true;
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break;
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}
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case CSSRule::Type::LayerBlock: {
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auto& layer_rule = verify_cast<CSSLayerBlockRule>(*rule);
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if (layer_rule.css_rules().evaluate_media_queries(window))
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any_media_queries_changed_match_state = true;
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break;
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}
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case CSSRule::Type::Media: {
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auto& media_rule = verify_cast<CSSMediaRule>(*rule);
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bool did_match = media_rule.condition_matches();
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bool now_matches = media_rule.evaluate(window);
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if (did_match != now_matches)
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any_media_queries_changed_match_state = true;
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if (now_matches && media_rule.css_rules().evaluate_media_queries(window))
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any_media_queries_changed_match_state = true;
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break;
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}
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case CSSRule::Type::Supports: {
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auto& supports_rule = verify_cast<CSSSupportsRule>(*rule);
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if (supports_rule.condition_matches() && supports_rule.css_rules().evaluate_media_queries(window))
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any_media_queries_changed_match_state = true;
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break;
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}
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case CSSRule::Type::Style: {
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auto& style_rule = verify_cast<CSSStyleRule>(*rule);
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if (style_rule.css_rules().evaluate_media_queries(window))
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any_media_queries_changed_match_state = true;
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break;
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}
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case CSSRule::Type::FontFace:
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case CSSRule::Type::Keyframe:
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case CSSRule::Type::Keyframes:
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case CSSRule::Type::LayerStatement:
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case CSSRule::Type::Namespace:
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case CSSRule::Type::NestedDeclarations:
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case CSSRule::Type::Property:
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break;
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}
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}
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return any_media_queries_changed_match_state;
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}
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Optional<JS::Value> CSSRuleList::item_value(size_t index) const
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{
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if (auto value = item(index))
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return value;
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return {};
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}
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}
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