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c0b4083b02
When deciding on a box type transformation (blockify/inlinify) for a pseudo element, we have to use the originating element as a reference rather than the parent. (The originating element *is* the parent for its pseudo elements.)
1709 lines
77 KiB
C++
1709 lines
77 KiB
C++
/*
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* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, the SerenityOS developers.
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.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/Debug.h>
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#include <AK/Error.h>
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#include <AK/HashMap.h>
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#include <AK/QuickSort.h>
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#include <AK/TemporaryChange.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Font/FontDatabase.h>
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#include <LibGfx/Font/FontStyleMapping.h>
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#include <LibGfx/Font/OpenType/Font.h>
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#include <LibGfx/Font/ScaledFont.h>
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#include <LibGfx/Font/VectorFont.h>
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#include <LibGfx/Font/WOFF/Font.h>
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#include <LibWeb/CSS/CSSFontFaceRule.h>
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#include <LibWeb/CSS/CSSImportRule.h>
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#include <LibWeb/CSS/CSSStyleRule.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/SelectorEngine.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/CSS/StyleSheet.h>
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#include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
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#include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
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#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
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#include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
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#include <LibWeb/CSS/StyleValues/FilterValueListStyleValue.h>
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#include <LibWeb/CSS/StyleValues/FlexFlowStyleValue.h>
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#include <LibWeb/CSS/StyleValues/FlexStyleValue.h>
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#include <LibWeb/CSS/StyleValues/FontStyleValue.h>
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#include <LibWeb/CSS/StyleValues/GridAreaShorthandStyleValue.h>
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#include <LibWeb/CSS/StyleValues/GridTrackPlacementShorthandStyleValue.h>
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#include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
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#include <LibWeb/CSS/StyleValues/IdentifierStyleValue.h>
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#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ListStyleStyleValue.h>
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#include <LibWeb/CSS/StyleValues/NumericStyleValue.h>
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#include <LibWeb/CSS/StyleValues/OverflowStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PositionStyleValue.h>
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#include <LibWeb/CSS/StyleValues/StyleValueList.h>
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#include <LibWeb/CSS/StyleValues/TextDecorationStyleValue.h>
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#include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/FontCache.h>
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#include <LibWeb/HTML/HTMLHtmlElement.h>
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#include <LibWeb/Loader/ResourceLoader.h>
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#include <LibWeb/Platform/FontPlugin.h>
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#include <stdio.h>
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namespace Web::CSS {
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StyleComputer::StyleComputer(DOM::Document& document)
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: m_document(document)
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{
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}
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StyleComputer::~StyleComputer() = default;
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class StyleComputer::FontLoader : public ResourceClient {
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public:
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explicit FontLoader(StyleComputer& style_computer, FlyString family_name, Vector<AK::URL> urls)
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: m_style_computer(style_computer)
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, m_family_name(move(family_name))
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, m_urls(move(urls))
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{
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start_loading_next_url();
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}
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virtual ~FontLoader() override { }
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virtual void resource_did_load() override
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{
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auto result = try_load_font();
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if (result.is_error())
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return start_loading_next_url();
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m_vector_font = result.release_value();
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m_style_computer.did_load_font(m_family_name);
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}
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virtual void resource_did_fail() override
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{
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}
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RefPtr<Gfx::Font> font_with_point_size(float point_size) const
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{
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if (!m_vector_font)
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return nullptr;
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if (auto it = m_cached_fonts.find(point_size); it != m_cached_fonts.end())
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return it->value;
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// FIXME: It might be nicer to have a global cap on the number of fonts we cache
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// instead of doing it at the per-font level like this.
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constexpr size_t max_cached_font_size_count = 64;
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if (m_cached_fonts.size() > max_cached_font_size_count)
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m_cached_fonts.remove(m_cached_fonts.begin());
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auto font = adopt_ref(*new Gfx::ScaledFont(*m_vector_font, point_size, point_size));
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m_cached_fonts.set(point_size, font);
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return font;
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}
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private:
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void start_loading_next_url()
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{
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if (m_urls.is_empty())
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return;
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LoadRequest request;
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request.set_url(m_urls.take_first());
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set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
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}
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ErrorOr<NonnullRefPtr<Gfx::VectorFont>> try_load_font()
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{
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// FIXME: This could maybe use the format() provided in @font-face as well, since often the mime type is just application/octet-stream and we have to try every format
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auto mime_type = resource()->mime_type();
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if (mime_type == "font/ttf"sv || mime_type == "application/x-font-ttf"sv)
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return TRY(OpenType::Font::try_load_from_externally_owned_memory(resource()->encoded_data()));
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if (mime_type == "font/woff"sv || mime_type == "application/font-woff"sv)
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return TRY(WOFF::Font::try_load_from_externally_owned_memory(resource()->encoded_data()));
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auto ttf = OpenType::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
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if (!ttf.is_error())
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return ttf.release_value();
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auto woff = WOFF::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
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if (!woff.is_error())
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return woff.release_value();
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return ttf.release_error();
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}
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StyleComputer& m_style_computer;
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FlyString m_family_name;
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RefPtr<Gfx::VectorFont> m_vector_font;
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Vector<AK::URL> m_urls;
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HashMap<float, NonnullRefPtr<Gfx::ScaledFont>> mutable m_cached_fonts;
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};
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static CSSStyleSheet& default_stylesheet(DOM::Document const& document)
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{
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static JS::Handle<CSSStyleSheet> sheet;
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if (!sheet.cell()) {
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extern StringView default_stylesheet_source;
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sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), default_stylesheet_source));
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}
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return *sheet;
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}
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static CSSStyleSheet& quirks_mode_stylesheet(DOM::Document const& document)
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{
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static JS::Handle<CSSStyleSheet> sheet;
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if (!sheet.cell()) {
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extern StringView quirks_mode_stylesheet_source;
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sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), quirks_mode_stylesheet_source));
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}
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return *sheet;
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}
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template<typename Callback>
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void StyleComputer::for_each_stylesheet(CascadeOrigin cascade_origin, Callback callback) const
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{
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if (cascade_origin == CascadeOrigin::UserAgent) {
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callback(default_stylesheet(document()));
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if (document().in_quirks_mode())
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callback(quirks_mode_stylesheet(document()));
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}
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if (cascade_origin == CascadeOrigin::Author) {
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for (auto const& sheet : document().style_sheets().sheets())
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callback(*sheet);
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}
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}
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StyleComputer::RuleCache const& StyleComputer::rule_cache_for_cascade_origin(CascadeOrigin cascade_origin) const
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{
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switch (cascade_origin) {
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case CascadeOrigin::Author:
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return *m_author_rule_cache;
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case CascadeOrigin::UserAgent:
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return *m_user_agent_rule_cache;
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default:
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TODO();
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}
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}
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Vector<MatchingRule> StyleComputer::collect_matching_rules(DOM::Element const& element, CascadeOrigin cascade_origin, Optional<CSS::Selector::PseudoElement> pseudo_element) const
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{
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auto const& rule_cache = rule_cache_for_cascade_origin(cascade_origin);
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Vector<MatchingRule> rules_to_run;
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auto add_rules_to_run = [&](Vector<MatchingRule> const& rules) {
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if (pseudo_element.has_value()) {
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for (auto& rule : rules) {
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if (rule.contains_pseudo_element)
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rules_to_run.append(rule);
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}
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} else {
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rules_to_run.extend(rules);
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}
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};
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for (auto const& class_name : element.class_names()) {
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if (auto it = rule_cache.rules_by_class.find(class_name); it != rule_cache.rules_by_class.end())
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add_rules_to_run(it->value);
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}
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if (auto id = element.get_attribute(HTML::AttributeNames::id); !id.is_null()) {
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if (auto it = rule_cache.rules_by_id.find(FlyString::from_deprecated_fly_string(id).release_value_but_fixme_should_propagate_errors()); it != rule_cache.rules_by_id.end())
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add_rules_to_run(it->value);
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}
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if (auto it = rule_cache.rules_by_tag_name.find(FlyString::from_deprecated_fly_string(element.local_name()).release_value_but_fixme_should_propagate_errors()); it != rule_cache.rules_by_tag_name.end())
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add_rules_to_run(it->value);
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add_rules_to_run(rule_cache.other_rules);
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Vector<MatchingRule> matching_rules;
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matching_rules.ensure_capacity(rules_to_run.size());
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for (auto const& rule_to_run : rules_to_run) {
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auto const& selector = rule_to_run.rule->selectors()[rule_to_run.selector_index];
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if (SelectorEngine::matches(selector, element, pseudo_element))
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matching_rules.append(rule_to_run);
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}
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return matching_rules;
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}
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static void sort_matching_rules(Vector<MatchingRule>& matching_rules)
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{
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quick_sort(matching_rules, [&](MatchingRule& a, MatchingRule& b) {
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auto const& a_selector = a.rule->selectors()[a.selector_index];
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auto const& b_selector = b.rule->selectors()[b.selector_index];
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auto a_specificity = a_selector->specificity();
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auto b_specificity = b_selector->specificity();
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if (a_selector->specificity() == b_selector->specificity()) {
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if (a.style_sheet_index == b.style_sheet_index)
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return a.rule_index < b.rule_index;
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return a.style_sheet_index < b.style_sheet_index;
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}
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return a_specificity < b_specificity;
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});
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}
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enum class Edge {
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Top,
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Right,
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Bottom,
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Left,
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All,
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};
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static bool contains(Edge a, Edge b)
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{
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return a == b || b == Edge::All;
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}
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static void set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, StyleValue const& value, DOM::Document& document)
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{
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auto assign_edge_values = [&style](PropertyID top_property, PropertyID right_property, PropertyID bottom_property, PropertyID left_property, auto const& values) {
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if (values.size() == 4) {
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style.set_property(top_property, values[0]);
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style.set_property(right_property, values[1]);
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style.set_property(bottom_property, values[2]);
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style.set_property(left_property, values[3]);
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} else if (values.size() == 3) {
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style.set_property(top_property, values[0]);
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style.set_property(right_property, values[1]);
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style.set_property(bottom_property, values[2]);
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style.set_property(left_property, values[1]);
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} else if (values.size() == 2) {
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style.set_property(top_property, values[0]);
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style.set_property(right_property, values[1]);
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style.set_property(bottom_property, values[0]);
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style.set_property(left_property, values[1]);
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} else if (values.size() == 1) {
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style.set_property(top_property, values[0]);
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style.set_property(right_property, values[0]);
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style.set_property(bottom_property, values[0]);
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style.set_property(left_property, values[0]);
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}
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};
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if (property_id == CSS::PropertyID::TextDecoration) {
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if (value.is_text_decoration()) {
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auto const& text_decoration = value.as_text_decoration();
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style.set_property(CSS::PropertyID::TextDecorationLine, text_decoration.line());
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style.set_property(CSS::PropertyID::TextDecorationThickness, text_decoration.thickness());
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style.set_property(CSS::PropertyID::TextDecorationStyle, text_decoration.style());
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style.set_property(CSS::PropertyID::TextDecorationColor, text_decoration.color());
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return;
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}
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style.set_property(CSS::PropertyID::TextDecorationLine, value);
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style.set_property(CSS::PropertyID::TextDecorationThickness, value);
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style.set_property(CSS::PropertyID::TextDecorationStyle, value);
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style.set_property(CSS::PropertyID::TextDecorationColor, value);
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return;
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}
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if (property_id == CSS::PropertyID::Overflow) {
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if (value.is_overflow()) {
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auto const& overflow = value.as_overflow();
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style.set_property(CSS::PropertyID::OverflowX, overflow.overflow_x());
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style.set_property(CSS::PropertyID::OverflowY, overflow.overflow_y());
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return;
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}
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style.set_property(CSS::PropertyID::OverflowX, value);
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style.set_property(CSS::PropertyID::OverflowY, value);
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return;
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}
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if (property_id == CSS::PropertyID::Border) {
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderTop, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderRight, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderBottom, value, document);
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set_property_expanding_shorthands(style, CSS::PropertyID::BorderLeft, value, document);
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// FIXME: Also reset border-image, in line with the spec: https://www.w3.org/TR/css-backgrounds-3/#border-shorthands
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return;
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}
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if (property_id == CSS::PropertyID::BorderRadius) {
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if (value.is_border_radius_shorthand()) {
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auto const& shorthand = value.as_border_radius_shorthand();
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style.set_property(CSS::PropertyID::BorderTopLeftRadius, shorthand.top_left());
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style.set_property(CSS::PropertyID::BorderTopRightRadius, shorthand.top_right());
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style.set_property(CSS::PropertyID::BorderBottomRightRadius, shorthand.bottom_right());
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style.set_property(CSS::PropertyID::BorderBottomLeftRadius, shorthand.bottom_left());
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return;
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}
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style.set_property(CSS::PropertyID::BorderTopLeftRadius, value);
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style.set_property(CSS::PropertyID::BorderTopRightRadius, value);
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style.set_property(CSS::PropertyID::BorderBottomRightRadius, value);
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style.set_property(CSS::PropertyID::BorderBottomLeftRadius, value);
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return;
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}
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if (property_id == CSS::PropertyID::BorderTop
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|| property_id == CSS::PropertyID::BorderRight
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|| property_id == CSS::PropertyID::BorderBottom
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|| property_id == CSS::PropertyID::BorderLeft) {
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Edge edge = Edge::All;
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switch (property_id) {
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case CSS::PropertyID::BorderTop:
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edge = Edge::Top;
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break;
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case CSS::PropertyID::BorderRight:
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edge = Edge::Right;
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break;
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case CSS::PropertyID::BorderBottom:
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edge = Edge::Bottom;
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break;
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case CSS::PropertyID::BorderLeft:
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edge = Edge::Left;
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break;
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default:
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break;
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}
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if (value.is_border()) {
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auto const& border = value.as_border();
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if (contains(Edge::Top, edge)) {
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style.set_property(PropertyID::BorderTopWidth, border.border_width());
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style.set_property(PropertyID::BorderTopStyle, border.border_style());
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style.set_property(PropertyID::BorderTopColor, border.border_color());
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}
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if (contains(Edge::Right, edge)) {
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style.set_property(PropertyID::BorderRightWidth, border.border_width());
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style.set_property(PropertyID::BorderRightStyle, border.border_style());
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style.set_property(PropertyID::BorderRightColor, border.border_color());
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}
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if (contains(Edge::Bottom, edge)) {
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style.set_property(PropertyID::BorderBottomWidth, border.border_width());
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style.set_property(PropertyID::BorderBottomStyle, border.border_style());
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style.set_property(PropertyID::BorderBottomColor, border.border_color());
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}
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if (contains(Edge::Left, edge)) {
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style.set_property(PropertyID::BorderLeftWidth, border.border_width());
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style.set_property(PropertyID::BorderLeftStyle, border.border_style());
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style.set_property(PropertyID::BorderLeftColor, border.border_color());
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}
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return;
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}
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return;
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}
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|
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if (property_id == CSS::PropertyID::BorderStyle) {
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if (value.is_value_list()) {
|
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auto const& values_list = value.as_value_list();
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assign_edge_values(PropertyID::BorderTopStyle, PropertyID::BorderRightStyle, PropertyID::BorderBottomStyle, PropertyID::BorderLeftStyle, values_list.values());
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return;
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}
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style.set_property(CSS::PropertyID::BorderTopStyle, value);
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style.set_property(CSS::PropertyID::BorderRightStyle, value);
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style.set_property(CSS::PropertyID::BorderBottomStyle, value);
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style.set_property(CSS::PropertyID::BorderLeftStyle, value);
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return;
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}
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|
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if (property_id == CSS::PropertyID::BorderWidth) {
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if (value.is_value_list()) {
|
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auto const& values_list = value.as_value_list();
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assign_edge_values(PropertyID::BorderTopWidth, PropertyID::BorderRightWidth, PropertyID::BorderBottomWidth, PropertyID::BorderLeftWidth, values_list.values());
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return;
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}
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|
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style.set_property(CSS::PropertyID::BorderTopWidth, value);
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style.set_property(CSS::PropertyID::BorderRightWidth, value);
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style.set_property(CSS::PropertyID::BorderBottomWidth, value);
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style.set_property(CSS::PropertyID::BorderLeftWidth, value);
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return;
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}
|
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|
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if (property_id == CSS::PropertyID::BorderColor) {
|
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if (value.is_value_list()) {
|
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auto const& values_list = value.as_value_list();
|
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assign_edge_values(PropertyID::BorderTopColor, PropertyID::BorderRightColor, PropertyID::BorderBottomColor, PropertyID::BorderLeftColor, values_list.values());
|
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return;
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}
|
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|
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style.set_property(CSS::PropertyID::BorderTopColor, value);
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style.set_property(CSS::PropertyID::BorderRightColor, value);
|
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style.set_property(CSS::PropertyID::BorderBottomColor, value);
|
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style.set_property(CSS::PropertyID::BorderLeftColor, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Background) {
|
||
if (value.is_background()) {
|
||
auto const& background = value.as_background();
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundColor, background.color(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundImage, background.image(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundPosition, background.position(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundSize, background.size(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeat, background.repeat(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundAttachment, background.attachment(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundOrigin, background.origin(), document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundClip, background.clip(), document);
|
||
return;
|
||
}
|
||
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundColor, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundImage, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundPosition, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundSize, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeat, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundAttachment, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundOrigin, value, document);
|
||
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundClip, value, document);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::BackgroundPosition) {
|
||
if (value.is_position()) {
|
||
auto const& position = value.as_position();
|
||
style.set_property(CSS::PropertyID::BackgroundPositionX, position.edge_x());
|
||
style.set_property(CSS::PropertyID::BackgroundPositionY, position.edge_y());
|
||
} else if (value.is_value_list()) {
|
||
// Expand background-position layer list into separate lists for x and y positions:
|
||
auto const& values_list = value.as_value_list();
|
||
StyleValueVector x_positions {};
|
||
StyleValueVector y_positions {};
|
||
x_positions.ensure_capacity(values_list.size());
|
||
y_positions.ensure_capacity(values_list.size());
|
||
for (auto& layer : values_list.values()) {
|
||
if (layer->is_position()) {
|
||
auto const& position = layer->as_position();
|
||
x_positions.unchecked_append(position.edge_x());
|
||
y_positions.unchecked_append(position.edge_y());
|
||
} else {
|
||
x_positions.unchecked_append(layer);
|
||
y_positions.unchecked_append(layer);
|
||
}
|
||
}
|
||
style.set_property(CSS::PropertyID::BackgroundPositionX, StyleValueList::create(move(x_positions), values_list.separator()));
|
||
style.set_property(CSS::PropertyID::BackgroundPositionY, StyleValueList::create(move(y_positions), values_list.separator()));
|
||
} else {
|
||
style.set_property(CSS::PropertyID::BackgroundPositionX, value);
|
||
style.set_property(CSS::PropertyID::BackgroundPositionY, value);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Margin) {
|
||
if (value.is_value_list()) {
|
||
auto const& values_list = value.as_value_list();
|
||
assign_edge_values(PropertyID::MarginTop, PropertyID::MarginRight, PropertyID::MarginBottom, PropertyID::MarginLeft, values_list.values());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::MarginTop, value);
|
||
style.set_property(CSS::PropertyID::MarginRight, value);
|
||
style.set_property(CSS::PropertyID::MarginBottom, value);
|
||
style.set_property(CSS::PropertyID::MarginLeft, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Padding) {
|
||
if (value.is_value_list()) {
|
||
auto const& values_list = value.as_value_list();
|
||
assign_edge_values(PropertyID::PaddingTop, PropertyID::PaddingRight, PropertyID::PaddingBottom, PropertyID::PaddingLeft, values_list.values());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::PaddingTop, value);
|
||
style.set_property(CSS::PropertyID::PaddingRight, value);
|
||
style.set_property(CSS::PropertyID::PaddingBottom, value);
|
||
style.set_property(CSS::PropertyID::PaddingLeft, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::ListStyle) {
|
||
if (value.is_list_style()) {
|
||
auto const& list_style = value.as_list_style();
|
||
style.set_property(CSS::PropertyID::ListStylePosition, list_style.position());
|
||
style.set_property(CSS::PropertyID::ListStyleImage, list_style.image());
|
||
style.set_property(CSS::PropertyID::ListStyleType, list_style.style_type());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::ListStylePosition, value);
|
||
style.set_property(CSS::PropertyID::ListStyleImage, value);
|
||
style.set_property(CSS::PropertyID::ListStyleType, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Font) {
|
||
if (value.is_font()) {
|
||
auto const& font_shorthand = value.as_font();
|
||
style.set_property(CSS::PropertyID::FontSize, font_shorthand.font_size());
|
||
style.set_property(CSS::PropertyID::FontFamily, font_shorthand.font_families());
|
||
style.set_property(CSS::PropertyID::FontStretch, font_shorthand.font_stretch());
|
||
style.set_property(CSS::PropertyID::FontStyle, font_shorthand.font_style());
|
||
style.set_property(CSS::PropertyID::FontWeight, font_shorthand.font_weight());
|
||
style.set_property(CSS::PropertyID::LineHeight, font_shorthand.line_height());
|
||
// FIXME: Implement font-variant
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::FontStretch, value);
|
||
style.set_property(CSS::PropertyID::FontSize, value);
|
||
style.set_property(CSS::PropertyID::FontFamily, value);
|
||
style.set_property(CSS::PropertyID::FontStyle, value);
|
||
style.set_property(CSS::PropertyID::FontWeight, value);
|
||
style.set_property(CSS::PropertyID::LineHeight, value);
|
||
// FIXME: Implement font-variant
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Flex) {
|
||
if (value.is_flex()) {
|
||
auto const& flex = value.as_flex();
|
||
style.set_property(CSS::PropertyID::FlexGrow, flex.grow());
|
||
style.set_property(CSS::PropertyID::FlexShrink, flex.shrink());
|
||
style.set_property(CSS::PropertyID::FlexBasis, flex.basis());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::FlexGrow, value);
|
||
style.set_property(CSS::PropertyID::FlexShrink, value);
|
||
style.set_property(CSS::PropertyID::FlexBasis, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::FlexFlow) {
|
||
if (value.is_flex_flow()) {
|
||
auto const& flex_flow = value.as_flex_flow();
|
||
style.set_property(CSS::PropertyID::FlexDirection, flex_flow.flex_direction());
|
||
style.set_property(CSS::PropertyID::FlexWrap, flex_flow.flex_wrap());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::FlexDirection, value);
|
||
style.set_property(CSS::PropertyID::FlexWrap, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::GridArea) {
|
||
if (value.is_grid_area_shorthand()) {
|
||
auto const& shorthand = value.as_grid_area_shorthand();
|
||
style.set_property(CSS::PropertyID::GridRowStart, shorthand.row_start());
|
||
style.set_property(CSS::PropertyID::GridColumnStart, shorthand.column_start());
|
||
style.set_property(CSS::PropertyID::GridRowEnd, shorthand.row_end());
|
||
style.set_property(CSS::PropertyID::GridColumnEnd, shorthand.column_end());
|
||
return;
|
||
}
|
||
style.set_property(CSS::PropertyID::GridRowStart, value);
|
||
style.set_property(CSS::PropertyID::GridColumnStart, value);
|
||
style.set_property(CSS::PropertyID::GridRowEnd, value);
|
||
style.set_property(CSS::PropertyID::GridColumnEnd, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::GridColumn) {
|
||
if (value.is_grid_track_placement_shorthand()) {
|
||
auto const& shorthand = value.as_grid_track_placement_shorthand();
|
||
style.set_property(CSS::PropertyID::GridColumnStart, shorthand.start());
|
||
style.set_property(CSS::PropertyID::GridColumnEnd, shorthand.end());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::GridColumnStart, value);
|
||
style.set_property(CSS::PropertyID::GridColumnEnd, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::GridRow) {
|
||
if (value.is_grid_track_placement_shorthand()) {
|
||
auto const& shorthand = value.as_grid_track_placement_shorthand();
|
||
style.set_property(CSS::PropertyID::GridRowStart, shorthand.start());
|
||
style.set_property(CSS::PropertyID::GridRowEnd, shorthand.end());
|
||
return;
|
||
}
|
||
|
||
style.set_property(CSS::PropertyID::GridRowStart, value);
|
||
style.set_property(CSS::PropertyID::GridRowEnd, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::Gap || property_id == CSS::PropertyID::GridGap) {
|
||
if (value.is_value_list()) {
|
||
auto const& values_list = value.as_value_list();
|
||
style.set_property(CSS::PropertyID::RowGap, values_list.values()[0]);
|
||
style.set_property(CSS::PropertyID::ColumnGap, values_list.values()[1]);
|
||
return;
|
||
}
|
||
style.set_property(CSS::PropertyID::RowGap, value);
|
||
style.set_property(CSS::PropertyID::ColumnGap, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::RowGap || property_id == CSS::PropertyID::GridRowGap) {
|
||
style.set_property(CSS::PropertyID::RowGap, value);
|
||
return;
|
||
}
|
||
|
||
if (property_id == CSS::PropertyID::ColumnGap || property_id == CSS::PropertyID::GridColumnGap) {
|
||
style.set_property(CSS::PropertyID::ColumnGap, value);
|
||
return;
|
||
}
|
||
|
||
style.set_property(property_id, value);
|
||
}
|
||
|
||
static RefPtr<StyleValue const> get_custom_property(DOM::Element const& element, FlyString const& custom_property_name)
|
||
{
|
||
for (auto const* current_element = &element; current_element; current_element = current_element->parent_element()) {
|
||
if (auto it = current_element->custom_properties().find(custom_property_name.to_string().to_deprecated_string()); it != current_element->custom_properties().end())
|
||
return it->value.value;
|
||
}
|
||
return nullptr;
|
||
}
|
||
|
||
bool StyleComputer::expand_variables(DOM::Element& element, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const
|
||
{
|
||
// Arbitrary large value chosen to avoid the billion-laughs attack.
|
||
// https://www.w3.org/TR/css-variables-1/#long-variables
|
||
const size_t MAX_VALUE_COUNT = 16384;
|
||
if (source.remaining_token_count() + dest.size() > MAX_VALUE_COUNT) {
|
||
dbgln("Stopped expanding CSS variables: maximum length reached.");
|
||
return false;
|
||
}
|
||
|
||
auto get_dependency_node = [&](FlyString name) -> NonnullRefPtr<PropertyDependencyNode> {
|
||
if (auto existing = dependencies.get(name); existing.has_value())
|
||
return *existing.value();
|
||
auto new_node = PropertyDependencyNode::create(name.to_string());
|
||
dependencies.set(name, new_node);
|
||
return new_node;
|
||
};
|
||
|
||
while (source.has_next_token()) {
|
||
auto const& value = source.next_token();
|
||
if (!value.is_function()) {
|
||
dest.empend(value);
|
||
continue;
|
||
}
|
||
if (!value.function().name().equals_ignoring_ascii_case("var"sv)) {
|
||
auto const& source_function = value.function();
|
||
Vector<Parser::ComponentValue> function_values;
|
||
Parser::TokenStream source_function_contents { source_function.values() };
|
||
if (!expand_variables(element, property_name, dependencies, source_function_contents, function_values))
|
||
return false;
|
||
NonnullRefPtr<Parser::Function> function = Parser::Function::create(FlyString::from_utf8(source_function.name()).release_value_but_fixme_should_propagate_errors(), move(function_values));
|
||
dest.empend(function);
|
||
continue;
|
||
}
|
||
|
||
Parser::TokenStream var_contents { value.function().values() };
|
||
var_contents.skip_whitespace();
|
||
if (!var_contents.has_next_token())
|
||
return false;
|
||
|
||
auto const& custom_property_name_token = var_contents.next_token();
|
||
if (!custom_property_name_token.is(Parser::Token::Type::Ident))
|
||
return false;
|
||
auto custom_property_name = custom_property_name_token.token().ident();
|
||
if (!custom_property_name.starts_with("--"sv))
|
||
return false;
|
||
|
||
// Detect dependency cycles. https://www.w3.org/TR/css-variables-1/#cycles
|
||
// We do not do this by the spec, since we are not keeping a graph of var dependencies around,
|
||
// but rebuilding it every time.
|
||
if (custom_property_name == property_name)
|
||
return false;
|
||
auto parent = get_dependency_node(FlyString::from_utf8(property_name).release_value_but_fixme_should_propagate_errors());
|
||
auto child = get_dependency_node(FlyString::from_utf8(custom_property_name).release_value_but_fixme_should_propagate_errors());
|
||
parent->add_child(child);
|
||
if (parent->has_cycles())
|
||
return false;
|
||
|
||
if (auto custom_property_value = get_custom_property(element, FlyString::from_utf8(custom_property_name).release_value_but_fixme_should_propagate_errors())) {
|
||
VERIFY(custom_property_value->is_unresolved());
|
||
Parser::TokenStream custom_property_tokens { custom_property_value->as_unresolved().values() };
|
||
if (!expand_variables(element, custom_property_name, dependencies, custom_property_tokens, dest))
|
||
return false;
|
||
continue;
|
||
}
|
||
|
||
// Use the provided fallback value, if any.
|
||
var_contents.skip_whitespace();
|
||
if (var_contents.has_next_token()) {
|
||
auto const& comma_token = var_contents.next_token();
|
||
if (!comma_token.is(Parser::Token::Type::Comma))
|
||
return false;
|
||
var_contents.skip_whitespace();
|
||
if (!expand_variables(element, property_name, dependencies, var_contents, dest))
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
bool StyleComputer::expand_unresolved_values(DOM::Element& element, StringView property_name, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const
|
||
{
|
||
// FIXME: Do this better!
|
||
// We build a copy of the tree of ComponentValues, with all var()s and attr()s replaced with their contents.
|
||
// This is a very naive solution, and we could do better if the CSS Parser could accept tokens one at a time.
|
||
|
||
while (source.has_next_token()) {
|
||
auto const& value = source.next_token();
|
||
if (value.is_function()) {
|
||
if (value.function().name().equals_ignoring_ascii_case("attr"sv)) {
|
||
// https://drafts.csswg.org/css-values-5/#attr-substitution
|
||
Parser::TokenStream attr_contents { value.function().values() };
|
||
attr_contents.skip_whitespace();
|
||
if (!attr_contents.has_next_token())
|
||
return false;
|
||
|
||
auto const& attr_name_token = attr_contents.next_token();
|
||
if (!attr_name_token.is(Parser::Token::Type::Ident))
|
||
return false;
|
||
auto attr_name = attr_name_token.token().ident();
|
||
|
||
auto attr_value = element.get_attribute(attr_name);
|
||
// 1. If the attr() function has a substitution value, replace the attr() function by the substitution value.
|
||
if (!attr_value.is_null()) {
|
||
// FIXME: attr() should also accept an optional type argument, not just strings.
|
||
dest.empend(Parser::Token::of_string(FlyString::from_deprecated_fly_string(attr_value).release_value_but_fixme_should_propagate_errors()));
|
||
continue;
|
||
}
|
||
|
||
// 2. Otherwise, if the attr() function has a fallback value as its last argument, replace the attr() function by the fallback value.
|
||
// If there are any var() or attr() references in the fallback, substitute them as well.
|
||
attr_contents.skip_whitespace();
|
||
if (attr_contents.has_next_token()) {
|
||
auto const& comma_token = attr_contents.next_token();
|
||
if (!comma_token.is(Parser::Token::Type::Comma))
|
||
return false;
|
||
attr_contents.skip_whitespace();
|
||
if (!expand_unresolved_values(element, property_name, attr_contents, dest))
|
||
return false;
|
||
continue;
|
||
}
|
||
|
||
// 3. Otherwise, the property containing the attr() function is invalid at computed-value time.
|
||
return false;
|
||
}
|
||
|
||
if (value.function().name().equals_ignoring_ascii_case("calc"sv)) {
|
||
auto const& calc_function = value.function();
|
||
if (auto calc_value = CSS::Parser::Parser::parse_calculated_value({}, Parser::ParsingContext { document() }, calc_function.values())) {
|
||
switch (calc_value->resolved_type()) {
|
||
case CalculatedStyleValue::ResolvedType::Integer: {
|
||
auto resolved_value = calc_value->resolve_integer();
|
||
dest.empend(Parser::Token::create_number(resolved_value.value()));
|
||
continue;
|
||
}
|
||
case CalculatedStyleValue::ResolvedType::Percentage: {
|
||
auto resolved_value = calc_value->resolve_percentage();
|
||
dest.empend(Parser::Token::create_percentage(resolved_value.value().value()));
|
||
continue;
|
||
}
|
||
default:
|
||
dbgln("FIXME: Unimplemented calc() expansion: {}", calc_value->to_string());
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
auto const& source_function = value.function();
|
||
Vector<Parser::ComponentValue> function_values;
|
||
Parser::TokenStream source_function_contents { source_function.values() };
|
||
if (!expand_unresolved_values(element, property_name, source_function_contents, function_values))
|
||
return false;
|
||
// FIXME: This would be much nicer if we could access the source_function's FlyString value directly.
|
||
NonnullRefPtr<Parser::Function> function = Parser::Function::create(FlyString::from_utf8(source_function.name()).release_value_but_fixme_should_propagate_errors(), move(function_values));
|
||
dest.empend(function);
|
||
continue;
|
||
}
|
||
if (value.is_block()) {
|
||
auto const& source_block = value.block();
|
||
Parser::TokenStream source_block_values { source_block.values() };
|
||
Vector<Parser::ComponentValue> block_values;
|
||
if (!expand_unresolved_values(element, property_name, source_block_values, block_values))
|
||
return false;
|
||
NonnullRefPtr<Parser::Block> block = Parser::Block::create(source_block.token(), move(block_values));
|
||
dest.empend(move(block));
|
||
continue;
|
||
}
|
||
dest.empend(value.token());
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
RefPtr<StyleValue> StyleComputer::resolve_unresolved_style_value(DOM::Element& element, PropertyID property_id, UnresolvedStyleValue const& unresolved) const
|
||
{
|
||
// Unresolved always contains a var() or attr(), unless it is a custom property's value, in which case we shouldn't be trying
|
||
// to produce a different StyleValue from it.
|
||
VERIFY(unresolved.contains_var_or_attr());
|
||
|
||
Parser::TokenStream unresolved_values_without_variables_expanded { unresolved.values() };
|
||
Vector<Parser::ComponentValue> values_with_variables_expanded;
|
||
|
||
HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>> dependencies;
|
||
if (!expand_variables(element, string_from_property_id(property_id), dependencies, unresolved_values_without_variables_expanded, values_with_variables_expanded))
|
||
return {};
|
||
|
||
Parser::TokenStream unresolved_values_with_variables_expanded { values_with_variables_expanded };
|
||
Vector<Parser::ComponentValue> expanded_values;
|
||
if (!expand_unresolved_values(element, string_from_property_id(property_id), unresolved_values_with_variables_expanded, expanded_values))
|
||
return {};
|
||
|
||
if (auto parsed_value = Parser::Parser::parse_css_value({}, Parser::ParsingContext { document() }, property_id, expanded_values))
|
||
return parsed_value.release_nonnull();
|
||
|
||
return {};
|
||
}
|
||
|
||
void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element, Vector<MatchingRule> const& matching_rules, CascadeOrigin cascade_origin, Important important) const
|
||
{
|
||
for (auto const& match : matching_rules) {
|
||
for (auto const& property : verify_cast<PropertyOwningCSSStyleDeclaration>(match.rule->declaration()).properties()) {
|
||
if (important != property.important)
|
||
continue;
|
||
auto property_value = property.value;
|
||
if (property.value->is_unresolved()) {
|
||
if (auto resolved = resolve_unresolved_style_value(element, property.property_id, property.value->as_unresolved()))
|
||
property_value = resolved.release_nonnull();
|
||
}
|
||
if (!property_value->is_unresolved())
|
||
set_property_expanding_shorthands(style, property.property_id, property_value, m_document);
|
||
}
|
||
}
|
||
|
||
if (cascade_origin == CascadeOrigin::Author && !pseudo_element.has_value()) {
|
||
if (auto const* inline_style = verify_cast<ElementInlineCSSStyleDeclaration>(element.inline_style())) {
|
||
for (auto const& property : inline_style->properties()) {
|
||
if (important != property.important)
|
||
continue;
|
||
auto property_value = property.value;
|
||
if (property.value->is_unresolved()) {
|
||
if (auto resolved = resolve_unresolved_style_value(element, property.property_id, property.value->as_unresolved()))
|
||
property_value = resolved.release_nonnull();
|
||
}
|
||
if (!property_value->is_unresolved())
|
||
set_property_expanding_shorthands(style, property.property_id, property_value, m_document);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
static ErrorOr<void> cascade_custom_properties(DOM::Element& element, Vector<MatchingRule> const& matching_rules)
|
||
{
|
||
size_t needed_capacity = 0;
|
||
for (auto const& matching_rule : matching_rules)
|
||
needed_capacity += verify_cast<PropertyOwningCSSStyleDeclaration>(matching_rule.rule->declaration()).custom_properties().size();
|
||
if (auto const* inline_style = verify_cast<PropertyOwningCSSStyleDeclaration>(element.inline_style()))
|
||
needed_capacity += inline_style->custom_properties().size();
|
||
|
||
HashMap<DeprecatedFlyString, StyleProperty> custom_properties;
|
||
TRY(custom_properties.try_ensure_capacity(needed_capacity));
|
||
|
||
for (auto const& matching_rule : matching_rules) {
|
||
for (auto const& it : verify_cast<PropertyOwningCSSStyleDeclaration>(matching_rule.rule->declaration()).custom_properties())
|
||
custom_properties.set(it.key, it.value);
|
||
}
|
||
|
||
if (auto const* inline_style = verify_cast<PropertyOwningCSSStyleDeclaration>(element.inline_style())) {
|
||
for (auto const& it : inline_style->custom_properties())
|
||
custom_properties.set(it.key, it.value);
|
||
}
|
||
|
||
element.set_custom_properties(move(custom_properties));
|
||
|
||
return {};
|
||
}
|
||
|
||
// https://www.w3.org/TR/css-cascade/#cascading
|
||
ErrorOr<void> StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element, bool& did_match_any_pseudo_element_rules, ComputeStyleMode mode) const
|
||
{
|
||
// First, we collect all the CSS rules whose selectors match `element`:
|
||
MatchingRuleSet matching_rule_set;
|
||
matching_rule_set.user_agent_rules = collect_matching_rules(element, CascadeOrigin::UserAgent, pseudo_element);
|
||
sort_matching_rules(matching_rule_set.user_agent_rules);
|
||
matching_rule_set.author_rules = collect_matching_rules(element, CascadeOrigin::Author, pseudo_element);
|
||
sort_matching_rules(matching_rule_set.author_rules);
|
||
|
||
if (mode == ComputeStyleMode::CreatePseudoElementStyleIfNeeded) {
|
||
VERIFY(pseudo_element.has_value());
|
||
if (matching_rule_set.author_rules.is_empty() && matching_rule_set.user_agent_rules.is_empty()) {
|
||
did_match_any_pseudo_element_rules = false;
|
||
return {};
|
||
}
|
||
did_match_any_pseudo_element_rules = true;
|
||
}
|
||
|
||
// Then we resolve all the CSS custom properties ("variables") for this element:
|
||
// FIXME: Look into how custom properties should interact with pseudo elements and support that properly.
|
||
if (!pseudo_element.has_value())
|
||
TRY(cascade_custom_properties(element, matching_rule_set.author_rules));
|
||
|
||
// Then we apply the declarations from the matched rules in cascade order:
|
||
|
||
// Normal user agent declarations
|
||
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::No);
|
||
|
||
// FIXME: Normal user declarations
|
||
|
||
// Author presentational hints (NOTE: The spec doesn't say exactly how to prioritize these.)
|
||
if (!pseudo_element.has_value())
|
||
element.apply_presentational_hints(style);
|
||
|
||
// Normal author declarations
|
||
cascade_declarations(style, element, pseudo_element, matching_rule_set.author_rules, CascadeOrigin::Author, Important::No);
|
||
|
||
// FIXME: Animation declarations [css-animations-1]
|
||
|
||
// Important author declarations
|
||
cascade_declarations(style, element, pseudo_element, matching_rule_set.author_rules, CascadeOrigin::Author, Important::Yes);
|
||
|
||
// FIXME: Important user declarations
|
||
|
||
// Important user agent declarations
|
||
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::Yes);
|
||
|
||
// FIXME: Transition declarations [css-transitions-1]
|
||
|
||
return {};
|
||
}
|
||
|
||
static DOM::Element const* element_to_inherit_style_from(DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element)
|
||
{
|
||
// Pseudo-elements treat their originating element as their parent.
|
||
DOM::Element const* parent_element = nullptr;
|
||
if (pseudo_element.has_value()) {
|
||
parent_element = element;
|
||
} else if (element) {
|
||
parent_element = element->parent_or_shadow_host_element();
|
||
}
|
||
return parent_element;
|
||
}
|
||
|
||
static NonnullRefPtr<StyleValue const> get_inherit_value(JS::Realm& initial_value_context_realm, CSS::PropertyID property_id, DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element)
|
||
{
|
||
auto* parent_element = element_to_inherit_style_from(element, pseudo_element);
|
||
|
||
if (!parent_element || !parent_element->computed_css_values())
|
||
return property_initial_value(initial_value_context_realm, property_id);
|
||
return parent_element->computed_css_values()->property(property_id);
|
||
};
|
||
|
||
void StyleComputer::compute_defaulted_property_value(StyleProperties& style, DOM::Element const* element, CSS::PropertyID property_id, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
// FIXME: If we don't know the correct initial value for a property, we fall back to InitialStyleValue.
|
||
|
||
auto& value_slot = style.m_property_values[to_underlying(property_id)];
|
||
if (!value_slot) {
|
||
if (is_inherited_property(property_id))
|
||
style.m_property_values[to_underlying(property_id)] = get_inherit_value(document().realm(), property_id, element, pseudo_element);
|
||
else
|
||
style.m_property_values[to_underlying(property_id)] = property_initial_value(document().realm(), property_id);
|
||
return;
|
||
}
|
||
|
||
if (value_slot->is_initial()) {
|
||
value_slot = property_initial_value(document().realm(), property_id);
|
||
return;
|
||
}
|
||
|
||
if (value_slot->is_inherit()) {
|
||
value_slot = get_inherit_value(document().realm(), property_id, element, pseudo_element);
|
||
return;
|
||
}
|
||
|
||
// https://www.w3.org/TR/css-cascade-4/#inherit-initial
|
||
// If the cascaded value of a property is the unset keyword,
|
||
if (value_slot->is_unset()) {
|
||
if (is_inherited_property(property_id)) {
|
||
// then if it is an inherited property, this is treated as inherit,
|
||
value_slot = get_inherit_value(document().realm(), property_id, element, pseudo_element);
|
||
} else {
|
||
// and if it is not, this is treated as initial.
|
||
value_slot = property_initial_value(document().realm(), property_id);
|
||
}
|
||
}
|
||
}
|
||
|
||
// https://www.w3.org/TR/css-cascade/#defaulting
|
||
void StyleComputer::compute_defaulted_values(StyleProperties& style, DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
// Walk the list of all known CSS properties and:
|
||
// - Add them to `style` if they are missing.
|
||
// - Resolve `inherit` and `initial` as needed.
|
||
for (auto i = to_underlying(CSS::first_longhand_property_id); i <= to_underlying(CSS::last_longhand_property_id); ++i) {
|
||
auto property_id = (CSS::PropertyID)i;
|
||
compute_defaulted_property_value(style, element, property_id, pseudo_element);
|
||
}
|
||
}
|
||
|
||
CSSPixels StyleComputer::root_element_font_size() const
|
||
{
|
||
constexpr float default_root_element_font_size = 16;
|
||
|
||
auto const* root_element = m_document->first_child_of_type<HTML::HTMLHtmlElement>();
|
||
if (!root_element)
|
||
return default_root_element_font_size;
|
||
|
||
auto const* computed_root_style = root_element->computed_css_values();
|
||
if (!computed_root_style)
|
||
return default_root_element_font_size;
|
||
|
||
auto root_value = computed_root_style->property(CSS::PropertyID::FontSize);
|
||
|
||
auto font_metrics = computed_root_style->computed_font().pixel_metrics();
|
||
auto line_height = font_metrics.line_spacing();
|
||
return root_value->to_length().to_px(viewport_rect(), font_metrics, default_root_element_font_size, default_root_element_font_size, line_height, line_height);
|
||
}
|
||
|
||
CSSPixels StyleComputer::root_element_line_height() const
|
||
{
|
||
constexpr float default_root_element_line_height = 16;
|
||
|
||
auto const* root_element = m_document->first_child_of_type<HTML::HTMLHtmlElement>();
|
||
if (!root_element)
|
||
return default_root_element_line_height;
|
||
|
||
auto const* computed_root_style = root_element->computed_css_values();
|
||
if (!computed_root_style)
|
||
return default_root_element_line_height;
|
||
|
||
auto font_metrics = computed_root_style->computed_font().pixel_metrics();
|
||
auto font_size = root_element_font_size();
|
||
auto line_height = font_metrics.line_spacing();
|
||
return computed_root_style->line_height(viewport_rect(), font_metrics, font_size, font_size, line_height, line_height);
|
||
}
|
||
|
||
void StyleComputer::compute_font(StyleProperties& style, DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
// To compute the font, first ensure that we've defaulted the relevant CSS font properties.
|
||
// FIXME: This should be more sophisticated.
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::FontFamily, pseudo_element);
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::FontSize, pseudo_element);
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::FontStretch, pseudo_element);
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::FontStyle, pseudo_element);
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::FontWeight, pseudo_element);
|
||
compute_defaulted_property_value(style, element, CSS::PropertyID::LineHeight, pseudo_element);
|
||
|
||
auto* parent_element = element_to_inherit_style_from(element, pseudo_element);
|
||
|
||
auto font_size = style.property(CSS::PropertyID::FontSize);
|
||
auto font_style = style.property(CSS::PropertyID::FontStyle);
|
||
auto font_weight = style.property(CSS::PropertyID::FontWeight);
|
||
auto font_stretch = style.property(CSS::PropertyID::FontStretch);
|
||
|
||
int width = Gfx::FontWidth::Normal;
|
||
if (font_stretch->is_identifier()) {
|
||
switch (static_cast<IdentifierStyleValue const&>(*font_stretch).id()) {
|
||
case CSS::ValueID::UltraCondensed:
|
||
width = Gfx::FontWidth::UltraCondensed;
|
||
break;
|
||
case CSS::ValueID::ExtraCondensed:
|
||
width = Gfx::FontWidth::ExtraCondensed;
|
||
break;
|
||
case CSS::ValueID::Condensed:
|
||
width = Gfx::FontWidth::Condensed;
|
||
break;
|
||
case CSS::ValueID::SemiCondensed:
|
||
width = Gfx::FontWidth::SemiCondensed;
|
||
break;
|
||
case CSS::ValueID::Normal:
|
||
width = Gfx::FontWidth::Normal;
|
||
break;
|
||
case CSS::ValueID::SemiExpanded:
|
||
width = Gfx::FontWidth::SemiExpanded;
|
||
break;
|
||
case CSS::ValueID::Expanded:
|
||
width = Gfx::FontWidth::Expanded;
|
||
break;
|
||
case CSS::ValueID::ExtraExpanded:
|
||
width = Gfx::FontWidth::ExtraExpanded;
|
||
break;
|
||
case CSS::ValueID::UltraExpanded:
|
||
width = Gfx::FontWidth::UltraExpanded;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
} else if (font_stretch->is_percentage()) {
|
||
float percentage = font_stretch->as_percentage().percentage().value();
|
||
if (percentage <= 50) {
|
||
width = Gfx::FontWidth::UltraCondensed;
|
||
} else if (percentage <= 62.5f) {
|
||
width = Gfx::FontWidth::ExtraCondensed;
|
||
} else if (percentage <= 75.0f) {
|
||
width = Gfx::FontWidth::Condensed;
|
||
} else if (percentage <= 87.5f) {
|
||
width = Gfx::FontWidth::SemiCondensed;
|
||
} else if (percentage <= 100.0f) {
|
||
width = Gfx::FontWidth::Normal;
|
||
} else if (percentage <= 112.5f) {
|
||
width = Gfx::FontWidth::SemiExpanded;
|
||
} else if (percentage <= 125.0f) {
|
||
width = Gfx::FontWidth::Expanded;
|
||
} else if (percentage <= 150.0f) {
|
||
width = Gfx::FontWidth::ExtraExpanded;
|
||
} else {
|
||
width = Gfx::FontWidth::UltraExpanded;
|
||
}
|
||
}
|
||
|
||
int weight = Gfx::FontWeight::Regular;
|
||
if (font_weight->is_identifier()) {
|
||
switch (static_cast<IdentifierStyleValue const&>(*font_weight).id()) {
|
||
case CSS::ValueID::Normal:
|
||
weight = Gfx::FontWeight::Regular;
|
||
break;
|
||
case CSS::ValueID::Bold:
|
||
weight = Gfx::FontWeight::Bold;
|
||
break;
|
||
case CSS::ValueID::Lighter:
|
||
// FIXME: This should be relative to the parent.
|
||
weight = Gfx::FontWeight::Regular;
|
||
break;
|
||
case CSS::ValueID::Bolder:
|
||
// FIXME: This should be relative to the parent.
|
||
weight = Gfx::FontWeight::Bold;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
} else if (font_weight->has_integer()) {
|
||
int font_weight_integer = font_weight->to_integer();
|
||
if (font_weight_integer <= Gfx::FontWeight::Regular)
|
||
weight = Gfx::FontWeight::Regular;
|
||
else if (font_weight_integer <= Gfx::FontWeight::Bold)
|
||
weight = Gfx::FontWeight::Bold;
|
||
else
|
||
weight = Gfx::FontWeight::Black;
|
||
} else if (font_weight->is_calculated()) {
|
||
auto maybe_weight = const_cast<CalculatedStyleValue&>(font_weight->as_calculated()).resolve_integer();
|
||
if (maybe_weight.has_value())
|
||
weight = maybe_weight.value();
|
||
}
|
||
|
||
bool bold = weight > Gfx::FontWeight::Regular;
|
||
|
||
// FIXME: Should be based on "user's default font size"
|
||
float font_size_in_px = 16;
|
||
|
||
if (font_size->is_identifier()) {
|
||
// https://w3c.github.io/csswg-drafts/css-fonts/#absolute-size-mapping
|
||
AK::HashMap<Web::CSS::ValueID, float> absolute_size_mapping = {
|
||
{ CSS::ValueID::XxSmall, 0.6 },
|
||
{ CSS::ValueID::XSmall, 0.75 },
|
||
{ CSS::ValueID::Small, 8.0 / 9.0 },
|
||
{ CSS::ValueID::Medium, 1.0 },
|
||
{ CSS::ValueID::Large, 1.2 },
|
||
{ CSS::ValueID::XLarge, 1.5 },
|
||
{ CSS::ValueID::XxLarge, 2.0 },
|
||
{ CSS::ValueID::XxxLarge, 3.0 },
|
||
{ CSS::ValueID::Smaller, 0.8 },
|
||
{ CSS::ValueID::Larger, 1.25 },
|
||
};
|
||
|
||
auto const identifier = static_cast<IdentifierStyleValue const&>(*font_size).id();
|
||
|
||
// https://w3c.github.io/csswg-drafts/css-fonts/#valdef-font-size-relative-size
|
||
// TODO: If the parent element has a keyword font size in the absolute size keyword mapping table,
|
||
// larger may compute the font size to the next entry in the table,
|
||
// and smaller may compute the font size to the previous entry in the table.
|
||
if (identifier == CSS::ValueID::Smaller || identifier == CSS::ValueID::Larger) {
|
||
if (parent_element && parent_element->computed_css_values()) {
|
||
font_size_in_px = parent_element->computed_css_values()->computed_font().pixel_metrics().size;
|
||
}
|
||
}
|
||
auto const multiplier = absolute_size_mapping.get(identifier).value_or(1.0);
|
||
font_size_in_px *= multiplier;
|
||
|
||
} else {
|
||
auto root_font_size = root_element_font_size();
|
||
auto root_line_height = root_element_line_height();
|
||
|
||
Gfx::FontPixelMetrics font_metrics;
|
||
if (parent_element && parent_element->computed_css_values())
|
||
font_metrics = parent_element->computed_css_values()->computed_font().pixel_metrics();
|
||
else
|
||
font_metrics = Platform::FontPlugin::the().default_font().pixel_metrics();
|
||
|
||
auto parent_font_size = [&]() -> CSSPixels {
|
||
if (!parent_element || !parent_element->computed_css_values())
|
||
return font_size_in_px;
|
||
auto value = parent_element->computed_css_values()->property(CSS::PropertyID::FontSize);
|
||
if (value->is_length()) {
|
||
auto length = static_cast<LengthStyleValue const&>(*value).to_length();
|
||
auto parent_line_height = parent_or_root_element_line_height(parent_element, {});
|
||
if (length.is_absolute() || length.is_relative())
|
||
return length.to_px(viewport_rect(), font_metrics, font_size_in_px, root_font_size, parent_line_height, root_line_height);
|
||
}
|
||
return font_size_in_px;
|
||
};
|
||
|
||
Optional<Length> maybe_length;
|
||
if (font_size->is_percentage()) {
|
||
// Percentages refer to parent element's font size
|
||
maybe_length = Length::make_px(font_size->as_percentage().percentage().as_fraction() * parent_font_size());
|
||
|
||
} else if (font_size->is_length()) {
|
||
maybe_length = font_size->to_length();
|
||
|
||
} else if (font_size->is_calculated()) {
|
||
// FIXME: Support font-size: calc(...)
|
||
// Theoretically we can do this now, but to resolve it we need a layout_node which we might not have. :^(
|
||
}
|
||
if (maybe_length.has_value()) {
|
||
auto parent_line_height = parent_or_root_element_line_height(element, pseudo_element);
|
||
auto px = maybe_length.value().to_px(viewport_rect(), font_metrics, parent_font_size(), root_font_size, parent_line_height, root_line_height).value();
|
||
if (px != 0)
|
||
font_size_in_px = px;
|
||
}
|
||
}
|
||
|
||
int slope = Gfx::name_to_slope("Normal"sv);
|
||
// FIXME: Implement oblique <angle>
|
||
if (font_style->is_identifier()) {
|
||
switch (static_cast<IdentifierStyleValue const&>(*font_style).id()) {
|
||
case CSS::ValueID::Italic:
|
||
slope = Gfx::name_to_slope("Italic"sv);
|
||
break;
|
||
case CSS::ValueID::Oblique:
|
||
slope = Gfx::name_to_slope("Oblique"sv);
|
||
break;
|
||
case CSS::ValueID::Normal:
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
// FIXME: Implement the full font-matching algorithm: https://www.w3.org/TR/css-fonts-4/#font-matching-algorithm
|
||
|
||
// Note: This is modified by the find_font() lambda
|
||
FontSelector font_selector;
|
||
bool monospace = false;
|
||
|
||
auto find_font = [&](String const& family) -> RefPtr<Gfx::Font const> {
|
||
float font_size_in_pt = font_size_in_px * 0.75f;
|
||
font_selector = { family, font_size_in_pt, weight, width, slope };
|
||
|
||
if (auto it = m_loaded_fonts.find(family); it != m_loaded_fonts.end()) {
|
||
auto& loader = *it->value;
|
||
if (auto found_font = loader.font_with_point_size(font_size_in_pt))
|
||
return found_font;
|
||
}
|
||
|
||
if (auto found_font = FontCache::the().get(font_selector))
|
||
return found_font;
|
||
|
||
if (auto found_font = Gfx::FontDatabase::the().get(family.to_deprecated_string(), font_size_in_pt, weight, width, slope, Gfx::Font::AllowInexactSizeMatch::Yes))
|
||
return found_font;
|
||
|
||
return {};
|
||
};
|
||
|
||
auto find_generic_font = [&](ValueID font_id) -> RefPtr<Gfx::Font const> {
|
||
Platform::GenericFont generic_font {};
|
||
switch (font_id) {
|
||
case ValueID::Monospace:
|
||
case ValueID::UiMonospace:
|
||
generic_font = Platform::GenericFont::Monospace;
|
||
monospace = true;
|
||
break;
|
||
case ValueID::Serif:
|
||
generic_font = Platform::GenericFont::Serif;
|
||
break;
|
||
case ValueID::Fantasy:
|
||
generic_font = Platform::GenericFont::Fantasy;
|
||
break;
|
||
case ValueID::SansSerif:
|
||
generic_font = Platform::GenericFont::SansSerif;
|
||
break;
|
||
case ValueID::Cursive:
|
||
generic_font = Platform::GenericFont::Cursive;
|
||
break;
|
||
case ValueID::UiSerif:
|
||
generic_font = Platform::GenericFont::UiSerif;
|
||
break;
|
||
case ValueID::UiSansSerif:
|
||
generic_font = Platform::GenericFont::UiSansSerif;
|
||
break;
|
||
case ValueID::UiRounded:
|
||
generic_font = Platform::GenericFont::UiRounded;
|
||
break;
|
||
default:
|
||
return {};
|
||
}
|
||
return find_font(String::from_utf8(Platform::FontPlugin::the().generic_font_name(generic_font)).release_value_but_fixme_should_propagate_errors());
|
||
};
|
||
|
||
RefPtr<Gfx::Font const> found_font;
|
||
|
||
auto family_value = style.property(PropertyID::FontFamily);
|
||
if (family_value->is_value_list()) {
|
||
auto const& family_list = static_cast<StyleValueList const&>(*family_value).values();
|
||
for (auto const& family : family_list) {
|
||
if (family->is_identifier()) {
|
||
found_font = find_generic_font(family->to_identifier());
|
||
} else if (family->is_string()) {
|
||
found_font = find_font(family->to_string().release_value_but_fixme_should_propagate_errors());
|
||
}
|
||
if (found_font)
|
||
break;
|
||
}
|
||
} else if (family_value->is_identifier()) {
|
||
found_font = find_generic_font(family_value->to_identifier());
|
||
} else if (family_value->is_string()) {
|
||
found_font = find_font(family_value->to_string().release_value_but_fixme_should_propagate_errors());
|
||
}
|
||
|
||
if (!found_font) {
|
||
found_font = StyleProperties::font_fallback(monospace, bold);
|
||
}
|
||
|
||
FontCache::the().set(font_selector, *found_font);
|
||
|
||
style.set_property(CSS::PropertyID::FontSize, LengthStyleValue::create(CSS::Length::make_px(font_size_in_px)));
|
||
style.set_property(CSS::PropertyID::FontWeight, NumericStyleValue::create_integer(weight));
|
||
|
||
style.set_computed_font(found_font.release_nonnull());
|
||
}
|
||
|
||
Gfx::Font const& StyleComputer::initial_font() const
|
||
{
|
||
// FIXME: This is not correct.
|
||
return StyleProperties::font_fallback(false, false);
|
||
}
|
||
|
||
CSSPixels StyleComputer::parent_or_root_element_line_height(DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
auto* parent_element = element_to_inherit_style_from(element, pseudo_element);
|
||
if (!parent_element)
|
||
return root_element_line_height();
|
||
auto root_font_size = root_element_font_size();
|
||
auto root_line_height = root_element_line_height();
|
||
auto* computed_values = parent_element->computed_css_values();
|
||
auto parent_font_size = computed_values->property(CSS::PropertyID::FontSize)->to_length();
|
||
// FIXME: Can the parent font size be non-absolute here?
|
||
auto parent_font_size_value = parent_font_size.is_absolute() ? parent_font_size.absolute_length_to_px() : root_font_size;
|
||
auto parent_parent_line_height = parent_or_root_element_line_height(parent_element, {});
|
||
return computed_values->line_height(viewport_rect(), computed_values->computed_font().pixel_metrics(), parent_font_size_value, root_font_size, parent_parent_line_height, root_line_height);
|
||
}
|
||
|
||
void StyleComputer::absolutize_values(StyleProperties& style, DOM::Element const* element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
auto root_line_height = root_element_line_height();
|
||
auto parent_or_root_line_height = parent_or_root_element_line_height(element, pseudo_element);
|
||
|
||
auto font_metrics = style.computed_font().pixel_metrics();
|
||
auto root_font_size = root_element_font_size();
|
||
auto font_size = style.property(CSS::PropertyID::FontSize)->to_length().to_px(viewport_rect(), font_metrics, root_font_size, root_font_size, parent_or_root_line_height, root_line_height);
|
||
|
||
// NOTE: Percentage line-height values are relative to the font-size of the element.
|
||
// We have to resolve them right away, so that the *computed* line-height is ready for inheritance.
|
||
// We can't simply absolutize *all* percentage values against the font size,
|
||
// because most percentages are relative to containing block metrics.
|
||
auto& line_height_value_slot = style.m_property_values[to_underlying(CSS::PropertyID::LineHeight)];
|
||
if (line_height_value_slot && line_height_value_slot->is_percentage()) {
|
||
line_height_value_slot = LengthStyleValue::create(
|
||
Length::make_px(font_size * line_height_value_slot->as_percentage().percentage().as_fraction()));
|
||
}
|
||
|
||
auto line_height = style.line_height(viewport_rect(), font_metrics, font_size.value(), root_font_size.value(), parent_or_root_line_height, root_line_height);
|
||
|
||
// NOTE: line-height might be using lh which should be resolved against the parent line height (like we did here already)
|
||
if (line_height_value_slot && line_height_value_slot->is_length())
|
||
line_height_value_slot = LengthStyleValue::create(Length::make_px(line_height));
|
||
|
||
for (size_t i = 0; i < style.m_property_values.size(); ++i) {
|
||
auto& value_slot = style.m_property_values[i];
|
||
if (!value_slot)
|
||
continue;
|
||
value_slot = value_slot->absolutized(viewport_rect(), font_metrics, font_size.value(), root_font_size.value(), line_height, root_line_height);
|
||
}
|
||
}
|
||
|
||
enum class BoxTypeTransformation {
|
||
None,
|
||
Blockify,
|
||
Inlinify,
|
||
};
|
||
|
||
static BoxTypeTransformation required_box_type_transformation(StyleProperties const& style, DOM::Element const& element, Optional<CSS::Selector::PseudoElement> const& pseudo_element)
|
||
{
|
||
// Absolute positioning or floating an element blockifies the box’s display type. [CSS2]
|
||
if (style.position() == CSS::Position::Absolute || style.position() == CSS::Position::Fixed || style.float_() != CSS::Float::None)
|
||
return BoxTypeTransformation::Blockify;
|
||
|
||
// FIXME: Containment in a ruby container inlinifies the box’s display type, as described in [CSS-RUBY-1].
|
||
|
||
// NOTE: If we're computing style for a pseudo-element, the effective parent will be the originating element itself, not its parent.
|
||
auto const* parent = pseudo_element.has_value() ? &element : element.parent_element();
|
||
|
||
// A parent with a grid or flex display value blockifies the box’s display type. [CSS-GRID-1] [CSS-FLEXBOX-1]
|
||
if (parent && parent->computed_css_values()) {
|
||
auto const& parent_display = parent->computed_css_values()->display();
|
||
if (parent_display.is_grid_inside() || parent_display.is_flex_inside())
|
||
return BoxTypeTransformation::Blockify;
|
||
}
|
||
|
||
return BoxTypeTransformation::None;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-display/#transformations
|
||
void StyleComputer::transform_box_type_if_needed(StyleProperties& style, DOM::Element const& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
// 2.7. Automatic Box Type Transformations
|
||
|
||
// Some layout effects require blockification or inlinification of the box type,
|
||
// which sets the box’s computed outer display type to block or inline (respectively).
|
||
// (This has no effect on display types that generate no box at all, such as none or contents.)
|
||
|
||
// FIXME: If a block box (block flow) is inlinified, its inner display type is set to flow-root so that it remains a block container.
|
||
//
|
||
// FIXME: If an inline box (inline flow) is inlinified, it recursively inlinifies all of its in-flow children,
|
||
// so that no block-level descendants break up the inline formatting context in which it participates.
|
||
//
|
||
// FIXME: For legacy reasons, if an inline block box (inline flow-root) is blockified, it becomes a block box (losing its flow-root nature).
|
||
// For consistency, a run-in flow-root box also blockifies to a block box.
|
||
//
|
||
// FIXME: If a layout-internal box is blockified, its inner display type converts to flow so that it becomes a block container.
|
||
// Inlinification has no effect on layout-internal boxes. (However, placement in such an inline context will typically cause them
|
||
// to be wrapped in an appropriately-typed anonymous inline-level box.)
|
||
|
||
auto display = style.display();
|
||
if (display.is_none() || display.is_contents())
|
||
return;
|
||
|
||
switch (required_box_type_transformation(style, element, pseudo_element)) {
|
||
case BoxTypeTransformation::None:
|
||
break;
|
||
case BoxTypeTransformation::Blockify:
|
||
if (!display.is_block_outside()) {
|
||
// FIXME: We only want to change the outer display type here, but we don't have a nice API
|
||
// to do that specifically. For now, we simply check for "inline-flex" and convert
|
||
// that to "flex".
|
||
if (display.is_flex_inside())
|
||
style.set_property(CSS::PropertyID::Display, IdentifierStyleValue::create(CSS::ValueID::Flex));
|
||
else
|
||
style.set_property(CSS::PropertyID::Display, IdentifierStyleValue::create(CSS::ValueID::Block));
|
||
}
|
||
break;
|
||
case BoxTypeTransformation::Inlinify:
|
||
if (!display.is_inline_outside())
|
||
style.set_property(CSS::PropertyID::Display, IdentifierStyleValue::create(CSS::ValueID::Inline));
|
||
break;
|
||
}
|
||
}
|
||
|
||
NonnullRefPtr<StyleProperties> StyleComputer::create_document_style() const
|
||
{
|
||
auto style = StyleProperties::create();
|
||
compute_font(style, nullptr, {});
|
||
compute_defaulted_values(style, nullptr, {});
|
||
absolutize_values(style, nullptr, {});
|
||
style->set_property(CSS::PropertyID::Width, CSS::LengthStyleValue::create(CSS::Length::make_px(viewport_rect().width())));
|
||
style->set_property(CSS::PropertyID::Height, CSS::LengthStyleValue::create(CSS::Length::make_px(viewport_rect().height())));
|
||
style->set_property(CSS::PropertyID::Display, CSS::IdentifierStyleValue::create(CSS::ValueID::Block));
|
||
return style;
|
||
}
|
||
|
||
ErrorOr<NonnullRefPtr<StyleProperties>> StyleComputer::compute_style(DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
auto style = TRY(compute_style_impl(element, move(pseudo_element), ComputeStyleMode::Normal));
|
||
return style.release_nonnull();
|
||
}
|
||
|
||
ErrorOr<RefPtr<StyleProperties>> StyleComputer::compute_pseudo_element_style_if_needed(DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element) const
|
||
{
|
||
return compute_style_impl(element, move(pseudo_element), ComputeStyleMode::CreatePseudoElementStyleIfNeeded);
|
||
}
|
||
|
||
ErrorOr<RefPtr<StyleProperties>> StyleComputer::compute_style_impl(DOM::Element& element, Optional<CSS::Selector::PseudoElement> pseudo_element, ComputeStyleMode mode) const
|
||
{
|
||
build_rule_cache_if_needed();
|
||
|
||
auto style = StyleProperties::create();
|
||
// 1. Perform the cascade. This produces the "specified style"
|
||
bool did_match_any_pseudo_element_rules = false;
|
||
TRY(compute_cascaded_values(style, element, pseudo_element, did_match_any_pseudo_element_rules, mode));
|
||
|
||
if (mode == ComputeStyleMode::CreatePseudoElementStyleIfNeeded && !did_match_any_pseudo_element_rules)
|
||
return nullptr;
|
||
|
||
// 2. Compute the font, since that may be needed for font-relative CSS units
|
||
compute_font(style, &element, pseudo_element);
|
||
|
||
// 3. Absolutize values, turning font/viewport relative lengths into absolute lengths
|
||
absolutize_values(style, &element, pseudo_element);
|
||
|
||
// 4. Default the values, applying inheritance and 'initial' as needed
|
||
compute_defaulted_values(style, &element, pseudo_element);
|
||
|
||
// 5. Run automatic box type transformations
|
||
transform_box_type_if_needed(style, element, pseudo_element);
|
||
|
||
return style;
|
||
}
|
||
|
||
PropertyDependencyNode::PropertyDependencyNode(String name)
|
||
: m_name(move(name))
|
||
{
|
||
}
|
||
|
||
void PropertyDependencyNode::add_child(NonnullRefPtr<PropertyDependencyNode> new_child)
|
||
{
|
||
for (auto const& child : m_children) {
|
||
if (child->m_name == new_child->m_name)
|
||
return;
|
||
}
|
||
|
||
// We detect self-reference already.
|
||
VERIFY(new_child->m_name != m_name);
|
||
m_children.append(move(new_child));
|
||
}
|
||
|
||
bool PropertyDependencyNode::has_cycles()
|
||
{
|
||
if (m_marked)
|
||
return true;
|
||
|
||
TemporaryChange change { m_marked, true };
|
||
for (auto& child : m_children) {
|
||
if (child->has_cycles())
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
void StyleComputer::build_rule_cache_if_needed() const
|
||
{
|
||
if (m_author_rule_cache && m_user_agent_rule_cache)
|
||
return;
|
||
const_cast<StyleComputer&>(*this).build_rule_cache();
|
||
}
|
||
|
||
NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_origin)
|
||
{
|
||
auto rule_cache = make<RuleCache>();
|
||
|
||
size_t num_class_rules = 0;
|
||
size_t num_id_rules = 0;
|
||
size_t num_tag_name_rules = 0;
|
||
size_t num_pseudo_element_rules = 0;
|
||
|
||
Vector<MatchingRule> matching_rules;
|
||
size_t style_sheet_index = 0;
|
||
for_each_stylesheet(cascade_origin, [&](auto& sheet) {
|
||
size_t rule_index = 0;
|
||
sheet.for_each_effective_style_rule([&](auto const& rule) {
|
||
size_t selector_index = 0;
|
||
for (CSS::Selector const& selector : rule.selectors()) {
|
||
MatchingRule matching_rule {
|
||
&rule,
|
||
style_sheet_index,
|
||
rule_index,
|
||
selector_index,
|
||
selector.specificity(),
|
||
};
|
||
|
||
for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors) {
|
||
if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoElement) {
|
||
matching_rule.contains_pseudo_element = true;
|
||
++num_pseudo_element_rules;
|
||
break;
|
||
}
|
||
}
|
||
|
||
bool added_to_bucket = false;
|
||
for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors) {
|
||
if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Id) {
|
||
rule_cache->rules_by_id.ensure(simple_selector.name()).append(move(matching_rule));
|
||
++num_id_rules;
|
||
added_to_bucket = true;
|
||
break;
|
||
}
|
||
if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Class) {
|
||
rule_cache->rules_by_class.ensure(simple_selector.name()).append(move(matching_rule));
|
||
++num_class_rules;
|
||
added_to_bucket = true;
|
||
break;
|
||
}
|
||
if (simple_selector.type == CSS::Selector::SimpleSelector::Type::TagName) {
|
||
rule_cache->rules_by_tag_name.ensure(simple_selector.name()).append(move(matching_rule));
|
||
++num_tag_name_rules;
|
||
added_to_bucket = true;
|
||
break;
|
||
}
|
||
}
|
||
if (!added_to_bucket)
|
||
rule_cache->other_rules.append(move(matching_rule));
|
||
|
||
++selector_index;
|
||
}
|
||
++rule_index;
|
||
});
|
||
++style_sheet_index;
|
||
});
|
||
|
||
if constexpr (LIBWEB_CSS_DEBUG) {
|
||
dbgln("Built rule cache!");
|
||
dbgln(" ID: {}", num_id_rules);
|
||
dbgln(" Class: {}", num_class_rules);
|
||
dbgln(" TagName: {}", num_tag_name_rules);
|
||
dbgln("PseudoElement: {}", num_pseudo_element_rules);
|
||
dbgln(" Other: {}", rule_cache->other_rules.size());
|
||
dbgln(" Total: {}", num_class_rules + num_id_rules + num_tag_name_rules + rule_cache->other_rules.size());
|
||
}
|
||
return rule_cache;
|
||
}
|
||
|
||
void StyleComputer::build_rule_cache()
|
||
{
|
||
m_author_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::Author);
|
||
m_user_agent_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::UserAgent);
|
||
}
|
||
|
||
void StyleComputer::invalidate_rule_cache()
|
||
{
|
||
m_author_rule_cache = nullptr;
|
||
|
||
// NOTE: It might not be necessary to throw away the UA rule cache.
|
||
// If we are sure that it's safe, we could keep it as an optimization.
|
||
m_user_agent_rule_cache = nullptr;
|
||
}
|
||
|
||
CSSPixelRect StyleComputer::viewport_rect() const
|
||
{
|
||
if (auto const* browsing_context = document().browsing_context())
|
||
return browsing_context->viewport_rect();
|
||
return {};
|
||
}
|
||
|
||
void StyleComputer::did_load_font([[maybe_unused]] FlyString const& family_name)
|
||
{
|
||
document().invalidate_style();
|
||
}
|
||
|
||
void StyleComputer::load_fonts_from_sheet(CSSStyleSheet const& sheet)
|
||
{
|
||
for (auto const& rule : static_cast<CSSStyleSheet const&>(sheet).rules()) {
|
||
if (!is<CSSFontFaceRule>(*rule))
|
||
continue;
|
||
auto const& font_face = static_cast<CSSFontFaceRule const&>(*rule).font_face();
|
||
if (font_face.sources().is_empty())
|
||
continue;
|
||
if (m_loaded_fonts.contains(font_face.font_family()))
|
||
continue;
|
||
|
||
Vector<AK::URL> urls;
|
||
for (auto& source : font_face.sources()) {
|
||
// FIXME: These should be loaded relative to the stylesheet URL instead of the document URL.
|
||
urls.append(m_document->parse_url(source.url.to_deprecated_string()));
|
||
}
|
||
|
||
if (urls.is_empty())
|
||
continue;
|
||
|
||
auto loader = make<FontLoader>(const_cast<StyleComputer&>(*this), font_face.font_family(), move(urls));
|
||
const_cast<StyleComputer&>(*this).m_loaded_fonts.set(font_face.font_family().to_string(), move(loader));
|
||
}
|
||
}
|
||
|
||
}
|