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https://github.com/LadybirdBrowser/ladybird.git
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fb975cc156
The spec has a general rule for this, which is roughly that "If it's not a falsey value, it's true". However, a couple of media-features are always false, apparently breaking this rule. To handle that, we have an array of false keywords in the JSON, instead of a single keyword. For those always-false media-features, we can enter all their values into this array. Gets us 2 more WPT subtest passes.
365 lines
14 KiB
C++
365 lines
14 KiB
C++
/*
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* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/MediaQuery.h>
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#include <LibWeb/CSS/Serialize.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/Window.h>
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#include <LibWeb/Page/Page.h>
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namespace Web::CSS {
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NonnullRefPtr<MediaQuery> MediaQuery::create_not_all()
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{
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auto media_query = new MediaQuery;
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media_query->m_negated = true;
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media_query->m_media_type = {
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.name = "all"_fly_string,
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.known_type = KnownMediaType::All,
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};
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return adopt_ref(*media_query);
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}
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String MediaFeatureValue::to_string() const
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{
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return m_value.visit(
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[](Keyword const& ident) { return MUST(String::from_utf8(string_from_keyword(ident))); },
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[](LengthOrCalculated const& length) { return length.to_string(); },
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[](Ratio const& ratio) { return ratio.to_string(); },
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[](ResolutionOrCalculated const& resolution) { return resolution.to_string(); },
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[](IntegerOrCalculated const& integer) {
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if (integer.is_calculated())
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return integer.calculated()->to_string(SerializationMode::Normal);
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return String::number(integer.value());
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},
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[&](Vector<Parser::ComponentValue> const& values) {
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return serialize_a_series_of_component_values(values);
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});
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}
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bool MediaFeatureValue::is_same_type(MediaFeatureValue const& other) const
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{
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return m_value.visit(
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[&](Keyword const&) { return other.is_ident(); },
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[&](LengthOrCalculated const&) { return other.is_length(); },
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[&](Ratio const&) { return other.is_ratio(); },
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[&](ResolutionOrCalculated const&) { return other.is_resolution(); },
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[&](IntegerOrCalculated const&) { return other.is_integer(); },
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[&](Vector<Parser::ComponentValue> const&) { return other.is_unknown(); });
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}
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String MediaFeature::to_string() const
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{
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auto comparison_string = [](Comparison comparison) -> StringView {
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switch (comparison) {
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case Comparison::Equal:
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return "="sv;
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case Comparison::LessThan:
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return "<"sv;
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case Comparison::LessThanOrEqual:
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return "<="sv;
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case Comparison::GreaterThan:
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return ">"sv;
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case Comparison::GreaterThanOrEqual:
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return ">="sv;
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}
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VERIFY_NOT_REACHED();
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};
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switch (m_type) {
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case Type::IsTrue:
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return MUST(String::from_utf8(string_from_media_feature_id(m_id)));
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case Type::ExactValue:
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return MUST(String::formatted("{}: {}", string_from_media_feature_id(m_id), value().to_string()));
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case Type::MinValue:
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return MUST(String::formatted("min-{}: {}", string_from_media_feature_id(m_id), value().to_string()));
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case Type::MaxValue:
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return MUST(String::formatted("max-{}: {}", string_from_media_feature_id(m_id), value().to_string()));
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case Type::Range: {
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auto& range = this->range();
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StringBuilder builder;
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if (range.left_comparison.has_value())
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builder.appendff("{} {} ", range.left_value->to_string(), comparison_string(*range.left_comparison));
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builder.append(string_from_media_feature_id(m_id));
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if (range.right_comparison.has_value())
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builder.appendff(" {} {}", comparison_string(*range.right_comparison), range.right_value->to_string());
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return builder.to_string_without_validation();
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}
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}
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VERIFY_NOT_REACHED();
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}
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MatchResult MediaFeature::evaluate(HTML::Window const* window) const
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{
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VERIFY(window);
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auto maybe_queried_value = window->query_media_feature(m_id);
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if (!maybe_queried_value.has_value())
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return MatchResult::False;
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auto queried_value = maybe_queried_value.release_value();
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CalculationResolutionContext calculation_context {
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.length_resolution_context = Length::ResolutionContext::for_window(*window),
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};
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switch (m_type) {
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case Type::IsTrue:
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if (queried_value.is_integer())
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return as_match_result(queried_value.integer().resolved(calculation_context) != 0);
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if (queried_value.is_length()) {
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auto length = queried_value.length().resolved(calculation_context);
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return as_match_result(length->raw_value() != 0);
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}
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// FIXME: I couldn't figure out from the spec how ratios should be evaluated in a boolean context.
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if (queried_value.is_ratio())
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return as_match_result(!queried_value.ratio().is_degenerate());
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if (queried_value.is_resolution())
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return as_match_result(queried_value.resolution().resolved(calculation_context).map([](auto& it) { return it.to_dots_per_pixel(); }).value_or(0) != 0);
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if (queried_value.is_ident()) {
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if (media_feature_keyword_is_falsey(m_id, queried_value.ident()))
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return MatchResult::False;
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return MatchResult::True;
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}
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return MatchResult::False;
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case Type::ExactValue:
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return compare(*window, value(), Comparison::Equal, queried_value);
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case Type::MinValue:
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return compare(*window, queried_value, Comparison::GreaterThanOrEqual, value());
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case Type::MaxValue:
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return compare(*window, queried_value, Comparison::LessThanOrEqual, value());
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case Type::Range: {
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auto const& range = this->range();
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if (range.left_comparison.has_value()) {
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if (auto const left_result = compare(*window, *range.left_value, *range.left_comparison, queried_value); left_result != MatchResult::True)
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return left_result;
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}
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if (range.right_comparison.has_value()) {
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if (auto const right_result = compare(*window, queried_value, *range.right_comparison, *range.right_value); right_result != MatchResult::True)
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return right_result;
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}
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return MatchResult::True;
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}
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}
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VERIFY_NOT_REACHED();
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}
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MatchResult MediaFeature::compare(HTML::Window const& window, MediaFeatureValue const& left, Comparison comparison, MediaFeatureValue const& right)
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{
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if (left.is_unknown() || right.is_unknown())
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return MatchResult::Unknown;
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if (!left.is_same_type(right))
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return MatchResult::False;
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if (left.is_ident()) {
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if (comparison == Comparison::Equal)
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return as_match_result(left.ident() == right.ident());
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return MatchResult::False;
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}
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CalculationResolutionContext calculation_context {
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.length_resolution_context = Length::ResolutionContext::for_window(window),
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};
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if (left.is_integer()) {
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switch (comparison) {
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case Comparison::Equal:
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return as_match_result(left.integer().resolved(calculation_context).value_or(0) == right.integer().resolved(calculation_context).value_or(0));
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case Comparison::LessThan:
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return as_match_result(left.integer().resolved(calculation_context).value_or(0) < right.integer().resolved(calculation_context).value_or(0));
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case Comparison::LessThanOrEqual:
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return as_match_result(left.integer().resolved(calculation_context).value_or(0) <= right.integer().resolved(calculation_context).value_or(0));
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case Comparison::GreaterThan:
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return as_match_result(left.integer().resolved(calculation_context).value_or(0) > right.integer().resolved(calculation_context).value_or(0));
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case Comparison::GreaterThanOrEqual:
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return as_match_result(left.integer().resolved(calculation_context).value_or(0) >= right.integer().resolved(calculation_context).value_or(0));
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}
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VERIFY_NOT_REACHED();
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}
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if (left.is_length()) {
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CSSPixels left_px;
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CSSPixels right_px;
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auto left_length = left.length().resolved(calculation_context).value_or(Length::make_px(0));
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auto right_length = right.length().resolved(calculation_context).value_or(Length::make_px(0));
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// Save ourselves some work if neither side is a relative length.
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if (left_length.is_absolute() && right_length.is_absolute()) {
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left_px = left_length.absolute_length_to_px();
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right_px = right_length.absolute_length_to_px();
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} else {
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auto viewport_rect = window.page().web_exposed_screen_area();
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auto const& initial_font = window.associated_document().style_computer().initial_font();
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Gfx::FontPixelMetrics const& initial_font_metrics = initial_font.pixel_metrics();
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Length::FontMetrics font_metrics { CSSPixels { initial_font.point_size() }, initial_font_metrics };
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left_px = left_length.to_px(viewport_rect, font_metrics, font_metrics);
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right_px = right_length.to_px(viewport_rect, font_metrics, font_metrics);
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}
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switch (comparison) {
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case Comparison::Equal:
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return as_match_result(left_px == right_px);
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case Comparison::LessThan:
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return as_match_result(left_px < right_px);
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case Comparison::LessThanOrEqual:
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return as_match_result(left_px <= right_px);
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case Comparison::GreaterThan:
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return as_match_result(left_px > right_px);
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case Comparison::GreaterThanOrEqual:
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return as_match_result(left_px >= right_px);
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}
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VERIFY_NOT_REACHED();
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}
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if (left.is_ratio()) {
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auto left_decimal = left.ratio().value();
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auto right_decimal = right.ratio().value();
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switch (comparison) {
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case Comparison::Equal:
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return as_match_result(left_decimal == right_decimal);
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case Comparison::LessThan:
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return as_match_result(left_decimal < right_decimal);
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case Comparison::LessThanOrEqual:
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return as_match_result(left_decimal <= right_decimal);
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case Comparison::GreaterThan:
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return as_match_result(left_decimal > right_decimal);
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case Comparison::GreaterThanOrEqual:
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return as_match_result(left_decimal >= right_decimal);
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}
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VERIFY_NOT_REACHED();
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}
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if (left.is_resolution()) {
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auto left_dppx = left.resolution().resolved(calculation_context).map([](auto& it) { return it.to_dots_per_pixel(); }).value_or(0);
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auto right_dppx = right.resolution().resolved(calculation_context).map([](auto& it) { return it.to_dots_per_pixel(); }).value_or(0);
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switch (comparison) {
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case Comparison::Equal:
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return as_match_result(left_dppx == right_dppx);
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case Comparison::LessThan:
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return as_match_result(left_dppx < right_dppx);
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case Comparison::LessThanOrEqual:
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return as_match_result(left_dppx <= right_dppx);
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case Comparison::GreaterThan:
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return as_match_result(left_dppx > right_dppx);
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case Comparison::GreaterThanOrEqual:
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return as_match_result(left_dppx >= right_dppx);
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}
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VERIFY_NOT_REACHED();
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}
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VERIFY_NOT_REACHED();
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}
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void MediaFeature::dump(StringBuilder& builder, int indent_levels) const
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{
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indent(builder, indent_levels);
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builder.appendff("MediaFeature: {}", to_string());
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}
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String MediaQuery::to_string() const
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{
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StringBuilder builder;
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if (m_negated)
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builder.append("not "sv);
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if (m_negated || m_media_type.known_type != KnownMediaType::All || !m_media_condition) {
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if (m_media_type.known_type.has_value()) {
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builder.append(CSS::to_string(m_media_type.known_type.value()));
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} else {
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builder.append(serialize_an_identifier(m_media_type.name.to_ascii_lowercase()));
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}
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if (m_media_condition)
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builder.append(" and "sv);
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}
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if (m_media_condition) {
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builder.append(m_media_condition->to_string());
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}
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return MUST(builder.to_string());
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}
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bool MediaQuery::evaluate(HTML::Window const& window)
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{
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auto matches_media = [](MediaType const& media) -> MatchResult {
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if (!media.known_type.has_value())
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return MatchResult::False;
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switch (media.known_type.value()) {
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case KnownMediaType::All:
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return MatchResult::True;
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case KnownMediaType::Print:
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// FIXME: Enable for printing, when we have printing!
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return MatchResult::False;
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case KnownMediaType::Screen:
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// FIXME: Disable for printing, when we have printing!
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return MatchResult::True;
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}
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VERIFY_NOT_REACHED();
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};
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MatchResult result = matches_media(m_media_type);
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if ((result != MatchResult::False) && m_media_condition)
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result = result && m_media_condition->evaluate(&window);
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if (m_negated)
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result = negate(result);
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m_matches = result == MatchResult::True;
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return m_matches;
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}
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// https://www.w3.org/TR/cssom-1/#serialize-a-media-query-list
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String serialize_a_media_query_list(Vector<NonnullRefPtr<MediaQuery>> const& media_queries)
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{
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// 1. If the media query list is empty, then return the empty string.
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if (media_queries.is_empty())
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return String {};
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// 2. Serialize each media query in the list of media queries, in the same order as they
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// appear in the media query list, and then serialize the list.
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return MUST(String::join(", "sv, media_queries));
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}
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Optional<MediaQuery::KnownMediaType> media_type_from_string(StringView name)
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{
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if (name.equals_ignoring_ascii_case("all"sv))
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return MediaQuery::KnownMediaType::All;
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if (name.equals_ignoring_ascii_case("print"sv))
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return MediaQuery::KnownMediaType::Print;
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if (name.equals_ignoring_ascii_case("screen"sv))
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return MediaQuery::KnownMediaType::Screen;
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return {};
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}
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StringView to_string(MediaQuery::KnownMediaType media_type)
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{
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switch (media_type) {
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case MediaQuery::KnownMediaType::All:
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return "all"sv;
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case MediaQuery::KnownMediaType::Print:
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return "print"sv;
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case MediaQuery::KnownMediaType::Screen:
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return "screen"sv;
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}
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VERIFY_NOT_REACHED();
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}
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}
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