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ladybird/Userland/Libraries/LibWeb/CSS/StyleValue.cpp

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <LibGfx/Palette.h>
#include <LibWeb/CSS/Serialize.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
#include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
#include <LibWeb/CSS/StyleValues/BackgroundRepeatStyleValue.h>
#include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
#include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
#include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
#include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
#include <LibWeb/CSS/StyleValues/ConicGradientStyleValue.h>
#include <LibWeb/CSS/StyleValues/ContentStyleValue.h>
#include <LibWeb/CSS/StyleValues/FilterValueListStyleValue.h>
#include <LibWeb/CSS/StyleValues/FlexFlowStyleValue.h>
#include <LibWeb/CSS/StyleValues/FlexStyleValue.h>
#include <LibWeb/CSS/StyleValues/FontStyleValue.h>
#include <LibWeb/CSS/StyleValues/FrequencyStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridAreaShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTemplateAreaStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackPlacementShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackSizeStyleValue.h>
#include <LibWeb/CSS/StyleValues/IdentifierStyleValue.h>
#include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
#include <LibWeb/CSS/StyleValues/InheritStyleValue.h>
#include <LibWeb/CSS/StyleValues/LinearGradientStyleValue.h>
#include <LibWeb/CSS/StyleValues/RadialGradientStyleValue.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/Loader/LoadRequest.h>
#include <LibWeb/Loader/ResourceLoader.h>
#include <LibWeb/Page/Page.h>
#include <LibWeb/Painting/GradientPainting.h>
#include <LibWeb/Platform/Timer.h>
namespace Web::CSS {
StyleValue::StyleValue(Type type)
: m_type(type)
{
}
AbstractImageStyleValue const& StyleValue::as_abstract_image() const
{
VERIFY(is_abstract_image());
return static_cast<AbstractImageStyleValue const&>(*this);
}
AngleStyleValue const& StyleValue::as_angle() const
{
VERIFY(is_angle());
return static_cast<AngleStyleValue const&>(*this);
}
BackgroundStyleValue const& StyleValue::as_background() const
{
VERIFY(is_background());
return static_cast<BackgroundStyleValue const&>(*this);
}
BackgroundRepeatStyleValue const& StyleValue::as_background_repeat() const
{
VERIFY(is_background_repeat());
return static_cast<BackgroundRepeatStyleValue const&>(*this);
}
BackgroundSizeStyleValue const& StyleValue::as_background_size() const
{
VERIFY(is_background_size());
return static_cast<BackgroundSizeStyleValue const&>(*this);
}
BorderStyleValue const& StyleValue::as_border() const
{
VERIFY(is_border());
return static_cast<BorderStyleValue const&>(*this);
}
BorderRadiusStyleValue const& StyleValue::as_border_radius() const
{
VERIFY(is_border_radius());
return static_cast<BorderRadiusStyleValue const&>(*this);
}
BorderRadiusShorthandStyleValue const& StyleValue::as_border_radius_shorthand() const
{
VERIFY(is_border_radius_shorthand());
return static_cast<BorderRadiusShorthandStyleValue const&>(*this);
}
ShadowStyleValue const& StyleValue::as_shadow() const
{
VERIFY(is_shadow());
return static_cast<ShadowStyleValue const&>(*this);
}
CalculatedStyleValue const& StyleValue::as_calculated() const
{
VERIFY(is_calculated());
return static_cast<CalculatedStyleValue const&>(*this);
}
ColorStyleValue const& StyleValue::as_color() const
{
VERIFY(is_color());
return static_cast<ColorStyleValue const&>(*this);
}
ConicGradientStyleValue const& StyleValue::as_conic_gradient() const
{
VERIFY(is_conic_gradient());
return static_cast<ConicGradientStyleValue const&>(*this);
}
ContentStyleValue const& StyleValue::as_content() const
{
VERIFY(is_content());
return static_cast<ContentStyleValue const&>(*this);
}
FilterValueListStyleValue const& StyleValue::as_filter_value_list() const
{
VERIFY(is_filter_value_list());
return static_cast<FilterValueListStyleValue const&>(*this);
}
FlexStyleValue const& StyleValue::as_flex() const
{
VERIFY(is_flex());
return static_cast<FlexStyleValue const&>(*this);
}
FlexFlowStyleValue const& StyleValue::as_flex_flow() const
{
VERIFY(is_flex_flow());
return static_cast<FlexFlowStyleValue const&>(*this);
}
FontStyleValue const& StyleValue::as_font() const
{
VERIFY(is_font());
return static_cast<FontStyleValue const&>(*this);
}
FrequencyStyleValue const& StyleValue::as_frequency() const
{
VERIFY(is_frequency());
return static_cast<FrequencyStyleValue const&>(*this);
}
GridTrackPlacementShorthandStyleValue const& StyleValue::as_grid_track_placement_shorthand() const
{
VERIFY(is_grid_track_placement_shorthand());
return static_cast<GridTrackPlacementShorthandStyleValue const&>(*this);
}
GridAreaShorthandStyleValue const& StyleValue::as_grid_area_shorthand() const
{
VERIFY(is_grid_area_shorthand());
return static_cast<GridAreaShorthandStyleValue const&>(*this);
}
GridTemplateAreaStyleValue const& StyleValue::as_grid_template_area() const
{
VERIFY(is_grid_template_area());
return static_cast<GridTemplateAreaStyleValue const&>(*this);
}
GridTrackPlacementStyleValue const& StyleValue::as_grid_track_placement() const
{
VERIFY(is_grid_track_placement());
return static_cast<GridTrackPlacementStyleValue const&>(*this);
}
IdentifierStyleValue const& StyleValue::as_identifier() const
{
VERIFY(is_identifier());
return static_cast<IdentifierStyleValue const&>(*this);
}
ImageStyleValue const& StyleValue::as_image() const
{
VERIFY(is_image());
return static_cast<ImageStyleValue const&>(*this);
}
InheritStyleValue const& StyleValue::as_inherit() const
{
VERIFY(is_inherit());
return static_cast<InheritStyleValue const&>(*this);
}
InitialStyleValue const& StyleValue::as_initial() const
{
VERIFY(is_initial());
return static_cast<InitialStyleValue const&>(*this);
}
LengthStyleValue const& StyleValue::as_length() const
{
VERIFY(is_length());
return static_cast<LengthStyleValue const&>(*this);
}
GridTrackSizeStyleValue const& StyleValue::as_grid_track_size_list() const
{
VERIFY(is_grid_track_size_list());
return static_cast<GridTrackSizeStyleValue const&>(*this);
}
LinearGradientStyleValue const& StyleValue::as_linear_gradient() const
{
VERIFY(is_linear_gradient());
return static_cast<LinearGradientStyleValue const&>(*this);
}
ListStyleStyleValue const& StyleValue::as_list_style() const
{
VERIFY(is_list_style());
return static_cast<ListStyleStyleValue const&>(*this);
}
NumericStyleValue const& StyleValue::as_numeric() const
{
VERIFY(is_numeric());
return static_cast<NumericStyleValue const&>(*this);
}
OverflowStyleValue const& StyleValue::as_overflow() const
{
VERIFY(is_overflow());
return static_cast<OverflowStyleValue const&>(*this);
}
PercentageStyleValue const& StyleValue::as_percentage() const
{
VERIFY(is_percentage());
return static_cast<PercentageStyleValue const&>(*this);
}
PositionStyleValue const& StyleValue::as_position() const
{
VERIFY(is_position());
return static_cast<PositionStyleValue const&>(*this);
}
RadialGradientStyleValue const& StyleValue::as_radial_gradient() const
{
VERIFY(is_radial_gradient());
return static_cast<RadialGradientStyleValue const&>(*this);
}
RectStyleValue const& StyleValue::as_rect() const
{
VERIFY(is_rect());
return static_cast<RectStyleValue const&>(*this);
}
ResolutionStyleValue const& StyleValue::as_resolution() const
{
VERIFY(is_resolution());
return static_cast<ResolutionStyleValue const&>(*this);
}
StringStyleValue const& StyleValue::as_string() const
{
VERIFY(is_string());
return static_cast<StringStyleValue const&>(*this);
}
TextDecorationStyleValue const& StyleValue::as_text_decoration() const
{
VERIFY(is_text_decoration());
return static_cast<TextDecorationStyleValue const&>(*this);
}
TimeStyleValue const& StyleValue::as_time() const
{
VERIFY(is_time());
return static_cast<TimeStyleValue const&>(*this);
}
TransformationStyleValue const& StyleValue::as_transformation() const
{
VERIFY(is_transformation());
return static_cast<TransformationStyleValue const&>(*this);
}
UnresolvedStyleValue const& StyleValue::as_unresolved() const
{
VERIFY(is_unresolved());
return static_cast<UnresolvedStyleValue const&>(*this);
}
UnsetStyleValue const& StyleValue::as_unset() const
{
VERIFY(is_unset());
return static_cast<UnsetStyleValue const&>(*this);
}
StyleValueList const& StyleValue::as_value_list() const
{
VERIFY(is_value_list());
return static_cast<StyleValueList const&>(*this);
}
void CalculatedStyleValue::CalculationResult::add(CalculationResult const& other, Layout::Node const* layout_node, PercentageBasis const& percentage_basis)
{
add_or_subtract_internal(SumOperation::Add, other, layout_node, percentage_basis);
}
void CalculatedStyleValue::CalculationResult::subtract(CalculationResult const& other, Layout::Node const* layout_node, PercentageBasis const& percentage_basis)
{
add_or_subtract_internal(SumOperation::Subtract, other, layout_node, percentage_basis);
}
void CalculatedStyleValue::CalculationResult::add_or_subtract_internal(SumOperation op, CalculationResult const& other, Layout::Node const* layout_node, PercentageBasis const& percentage_basis)
{
// We know from validation when resolving the type, that "both sides have the same type, or that one side is a <number> and the other is an <integer>".
// Though, having the same type may mean that one side is a <dimension> and the other a <percentage>.
// Note: This is almost identical to ::add()
m_value.visit(
[&](Number const& number) {
auto other_number = other.m_value.get<Number>();
if (op == SumOperation::Add) {
m_value = number + other_number;
} else {
m_value = number - other_number;
}
},
[&](Angle const& angle) {
auto this_degrees = angle.to_degrees();
if (other.m_value.has<Angle>()) {
auto other_degrees = other.m_value.get<Angle>().to_degrees();
if (op == SumOperation::Add)
m_value = Angle::make_degrees(this_degrees + other_degrees);
else
m_value = Angle::make_degrees(this_degrees - other_degrees);
} else {
VERIFY(percentage_basis.has<Angle>());
auto other_degrees = percentage_basis.get<Angle>().percentage_of(other.m_value.get<Percentage>()).to_degrees();
if (op == SumOperation::Add)
m_value = Angle::make_degrees(this_degrees + other_degrees);
else
m_value = Angle::make_degrees(this_degrees - other_degrees);
}
},
[&](Frequency const& frequency) {
auto this_hertz = frequency.to_hertz();
if (other.m_value.has<Frequency>()) {
auto other_hertz = other.m_value.get<Frequency>().to_hertz();
if (op == SumOperation::Add)
m_value = Frequency::make_hertz(this_hertz + other_hertz);
else
m_value = Frequency::make_hertz(this_hertz - other_hertz);
} else {
VERIFY(percentage_basis.has<Frequency>());
auto other_hertz = percentage_basis.get<Frequency>().percentage_of(other.m_value.get<Percentage>()).to_hertz();
if (op == SumOperation::Add)
m_value = Frequency::make_hertz(this_hertz + other_hertz);
else
m_value = Frequency::make_hertz(this_hertz - other_hertz);
}
},
[&](Length const& length) {
auto this_px = length.to_px(*layout_node);
if (other.m_value.has<Length>()) {
auto other_px = other.m_value.get<Length>().to_px(*layout_node);
if (op == SumOperation::Add)
m_value = Length::make_px(this_px + other_px);
else
m_value = Length::make_px(this_px - other_px);
} else {
VERIFY(percentage_basis.has<Length>());
auto other_px = percentage_basis.get<Length>().percentage_of(other.m_value.get<Percentage>()).to_px(*layout_node);
if (op == SumOperation::Add)
m_value = Length::make_px(this_px + other_px);
else
m_value = Length::make_px(this_px - other_px);
}
},
[&](Time const& time) {
auto this_seconds = time.to_seconds();
if (other.m_value.has<Time>()) {
auto other_seconds = other.m_value.get<Time>().to_seconds();
if (op == SumOperation::Add)
m_value = Time::make_seconds(this_seconds + other_seconds);
else
m_value = Time::make_seconds(this_seconds - other_seconds);
} else {
VERIFY(percentage_basis.has<Time>());
auto other_seconds = percentage_basis.get<Time>().percentage_of(other.m_value.get<Percentage>()).to_seconds();
if (op == SumOperation::Add)
m_value = Time::make_seconds(this_seconds + other_seconds);
else
m_value = Time::make_seconds(this_seconds - other_seconds);
}
},
[&](Percentage const& percentage) {
if (other.m_value.has<Percentage>()) {
if (op == SumOperation::Add)
m_value = Percentage { percentage.value() + other.m_value.get<Percentage>().value() };
else
m_value = Percentage { percentage.value() - other.m_value.get<Percentage>().value() };
return;
}
// Other side isn't a percentage, so the easiest way to handle it without duplicating all the logic, is just to swap `this` and `other`.
CalculationResult new_value = other;
if (op == SumOperation::Add) {
new_value.add(*this, layout_node, percentage_basis);
} else {
// Turn 'this - other' into '-other + this', as 'A + B == B + A', but 'A - B != B - A'
new_value.multiply_by({ Number { Number::Type::Integer, -1.0f } }, layout_node);
new_value.add(*this, layout_node, percentage_basis);
}
*this = new_value;
});
}
void CalculatedStyleValue::CalculationResult::multiply_by(CalculationResult const& other, Layout::Node const* layout_node)
{
// We know from validation when resolving the type, that at least one side must be a <number> or <integer>.
// Both of these are represented as a float.
VERIFY(m_value.has<Number>() || other.m_value.has<Number>());
bool other_is_number = other.m_value.has<Number>();
m_value.visit(
[&](Number const& number) {
if (other_is_number) {
m_value = number * other.m_value.get<Number>();
} else {
// Avoid duplicating all the logic by swapping `this` and `other`.
CalculationResult new_value = other;
new_value.multiply_by(*this, layout_node);
*this = new_value;
}
},
[&](Angle const& angle) {
m_value = Angle::make_degrees(angle.to_degrees() * other.m_value.get<Number>().value());
},
[&](Frequency const& frequency) {
m_value = Frequency::make_hertz(frequency.to_hertz() * other.m_value.get<Number>().value());
},
[&](Length const& length) {
VERIFY(layout_node);
m_value = Length::make_px(length.to_px(*layout_node) * other.m_value.get<Number>().value());
},
[&](Time const& time) {
m_value = Time::make_seconds(time.to_seconds() * other.m_value.get<Number>().value());
},
[&](Percentage const& percentage) {
m_value = Percentage { percentage.value() * other.m_value.get<Number>().value() };
});
}
void CalculatedStyleValue::CalculationResult::divide_by(CalculationResult const& other, Layout::Node const* layout_node)
{
// We know from validation when resolving the type, that `other` must be a <number> or <integer>.
// Both of these are represented as a Number.
auto denominator = other.m_value.get<Number>().value();
// FIXME: Dividing by 0 is invalid, and should be caught during parsing.
VERIFY(denominator != 0.0f);
m_value.visit(
[&](Number const& number) {
m_value = Number {
Number::Type::Number,
number.value() / denominator
};
},
[&](Angle const& angle) {
m_value = Angle::make_degrees(angle.to_degrees() / denominator);
},
[&](Frequency const& frequency) {
m_value = Frequency::make_hertz(frequency.to_hertz() / denominator);
},
[&](Length const& length) {
VERIFY(layout_node);
m_value = Length::make_px(length.to_px(*layout_node) / denominator);
},
[&](Time const& time) {
m_value = Time::make_seconds(time.to_seconds() / denominator);
},
[&](Percentage const& percentage) {
m_value = Percentage { percentage.value() / denominator };
});
}
ErrorOr<String> CalculatedStyleValue::to_string() const
{
return String::formatted("calc({})", TRY(m_expression->to_string()));
}
bool CalculatedStyleValue::equals(StyleValue const& other) const
{
if (type() != other.type())
return false;
// This is a case where comparing the strings actually makes sense.
return to_string().release_value_but_fixme_should_propagate_errors() == other.to_string().release_value_but_fixme_should_propagate_errors();
}
ErrorOr<String> CalculatedStyleValue::CalcNumberValue::to_string() const
{
return value.visit(
[](Number const& number) -> ErrorOr<String> { return String::number(number.value()); },
[](NonnullOwnPtr<CalcNumberSum> const& sum) -> ErrorOr<String> { return String::formatted("({})", TRY(sum->to_string())); });
}
ErrorOr<String> CalculatedStyleValue::CalcValue::to_string() const
{
return value.visit(
[](Number const& number) -> ErrorOr<String> { return String::number(number.value()); },
[](NonnullOwnPtr<CalcSum> const& sum) -> ErrorOr<String> { return String::formatted("({})", TRY(sum->to_string())); },
[](auto const& v) -> ErrorOr<String> { return v.to_string(); });
}
ErrorOr<String> CalculatedStyleValue::CalcSum::to_string() const
{
StringBuilder builder;
TRY(builder.try_append(TRY(first_calc_product->to_string())));
for (auto const& item : zero_or_more_additional_calc_products)
TRY(builder.try_append(TRY(item->to_string())));
return builder.to_string();
}
ErrorOr<String> CalculatedStyleValue::CalcNumberSum::to_string() const
{
StringBuilder builder;
TRY(builder.try_append(TRY(first_calc_number_product->to_string())));
for (auto const& item : zero_or_more_additional_calc_number_products)
TRY(builder.try_append(TRY(item->to_string())));
return builder.to_string();
}
ErrorOr<String> CalculatedStyleValue::CalcProduct::to_string() const
{
StringBuilder builder;
TRY(builder.try_append(TRY(first_calc_value.to_string())));
for (auto const& item : zero_or_more_additional_calc_values)
TRY(builder.try_append(TRY(item->to_string())));
return builder.to_string();
}
ErrorOr<String> CalculatedStyleValue::CalcSumPartWithOperator::to_string() const
{
return String::formatted(" {} {}", op == SumOperation::Add ? "+"sv : "-"sv, TRY(value->to_string()));
}
ErrorOr<String> CalculatedStyleValue::CalcProductPartWithOperator::to_string() const
{
auto value_string = TRY(value.visit(
[](CalcValue const& v) { return v.to_string(); },
[](CalcNumberValue const& v) { return v.to_string(); }));
return String::formatted(" {} {}", op == ProductOperation::Multiply ? "*"sv : "/"sv, value_string);
}
ErrorOr<String> CalculatedStyleValue::CalcNumberProduct::to_string() const
{
StringBuilder builder;
TRY(builder.try_append(TRY(first_calc_number_value.to_string())));
for (auto const& item : zero_or_more_additional_calc_number_values)
TRY(builder.try_append(TRY(item->to_string())));
return builder.to_string();
}
ErrorOr<String> CalculatedStyleValue::CalcNumberProductPartWithOperator::to_string() const
{
return String::formatted(" {} {}", op == ProductOperation::Multiply ? "*"sv : "/"sv, TRY(value.to_string()));
}
ErrorOr<String> CalculatedStyleValue::CalcNumberSumPartWithOperator::to_string() const
{
return String::formatted(" {} {}", op == SumOperation::Add ? "+"sv : "-"sv, TRY(value->to_string()));
}
Optional<Angle> CalculatedStyleValue::resolve_angle() const
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Angle>())
return result.value().get<Angle>();
return {};
}
Optional<Angle> CalculatedStyleValue::resolve_angle_percentage(Angle const& percentage_basis) const
{
auto result = m_expression->resolve(nullptr, percentage_basis);
return result.value().visit(
[&](Angle const& angle) -> Optional<Angle> {
return angle;
},
[&](Percentage const& percentage) -> Optional<Angle> {
return percentage_basis.percentage_of(percentage);
},
[&](auto const&) -> Optional<Angle> {
return {};
});
}
Optional<Frequency> CalculatedStyleValue::resolve_frequency() const
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Frequency>())
return result.value().get<Frequency>();
return {};
}
Optional<Frequency> CalculatedStyleValue::resolve_frequency_percentage(Frequency const& percentage_basis) const
{
auto result = m_expression->resolve(nullptr, percentage_basis);
return result.value().visit(
[&](Frequency const& frequency) -> Optional<Frequency> {
return frequency;
},
[&](Percentage const& percentage) -> Optional<Frequency> {
return percentage_basis.percentage_of(percentage);
},
[&](auto const&) -> Optional<Frequency> {
return {};
});
}
Optional<Length> CalculatedStyleValue::resolve_length(Layout::Node const& layout_node) const
{
auto result = m_expression->resolve(&layout_node, {});
if (result.value().has<Length>())
return result.value().get<Length>();
return {};
}
Optional<Length> CalculatedStyleValue::resolve_length_percentage(Layout::Node const& layout_node, Length const& percentage_basis) const
{
auto result = m_expression->resolve(&layout_node, percentage_basis);
return result.value().visit(
[&](Length const& length) -> Optional<Length> {
return length;
},
[&](Percentage const& percentage) -> Optional<Length> {
return percentage_basis.percentage_of(percentage);
},
[&](auto const&) -> Optional<Length> {
return {};
});
}
Optional<Percentage> CalculatedStyleValue::resolve_percentage() const
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Percentage>())
return result.value().get<Percentage>();
return {};
}
Optional<Time> CalculatedStyleValue::resolve_time() const
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Time>())
return result.value().get<Time>();
return {};
}
Optional<Time> CalculatedStyleValue::resolve_time_percentage(Time const& percentage_basis) const
{
auto result = m_expression->resolve(nullptr, percentage_basis);
return result.value().visit(
[&](Time const& time) -> Optional<Time> {
return time;
},
[&](auto const&) -> Optional<Time> {
return {};
});
}
Optional<float> CalculatedStyleValue::resolve_number()
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Number>())
return result.value().get<Number>().value();
return {};
}
Optional<i64> CalculatedStyleValue::resolve_integer()
{
auto result = m_expression->resolve(nullptr, {});
if (result.value().has<Number>())
return result.value().get<Number>().integer_value();
return {};
}
static bool is_number(CalculatedStyleValue::ResolvedType type)
{
return type == CalculatedStyleValue::ResolvedType::Number || type == CalculatedStyleValue::ResolvedType::Integer;
}
static bool is_dimension(CalculatedStyleValue::ResolvedType type)
{
return type != CalculatedStyleValue::ResolvedType::Number
&& type != CalculatedStyleValue::ResolvedType::Integer
&& type != CalculatedStyleValue::ResolvedType::Percentage;
}
template<typename SumWithOperator>
static Optional<CalculatedStyleValue::ResolvedType> resolve_sum_type(CalculatedStyleValue::ResolvedType first_type, Vector<NonnullOwnPtr<SumWithOperator>> const& zero_or_more_additional_products)
{
auto type = first_type;
for (auto const& product : zero_or_more_additional_products) {
auto maybe_product_type = product->resolved_type();
if (!maybe_product_type.has_value())
return {};
auto product_type = maybe_product_type.value();
// At + or -, check that both sides have the same type, or that one side is a <number> and the other is an <integer>.
// If both sides are the same type, resolve to that type.
if (product_type == type)
continue;
// If one side is a <number> and the other is an <integer>, resolve to <number>.
if (is_number(type) && is_number(product_type)) {
type = CalculatedStyleValue::ResolvedType::Number;
continue;
}
// FIXME: calc() handles <percentage> by allowing them to pretend to be whatever <dimension> type is allowed at this location.
// Since we can't easily check what that type is, we just allow <percentage> to combine with any other <dimension> type.
if (type == CalculatedStyleValue::ResolvedType::Percentage && is_dimension(product_type)) {
type = product_type;
continue;
}
if (is_dimension(type) && product_type == CalculatedStyleValue::ResolvedType::Percentage)
continue;
return {};
}
return type;
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcSum::resolved_type() const
{
auto maybe_type = first_calc_product->resolved_type();
if (!maybe_type.has_value())
return {};
auto type = maybe_type.value();
return resolve_sum_type(type, zero_or_more_additional_calc_products);
}
// https://www.w3.org/TR/CSS2/visufx.html#value-def-shape
Gfx::FloatRect EdgeRect::resolved(Layout::Node const& layout_node, Gfx::FloatRect border_box) const
{
// In CSS 2.1, the only valid <shape> value is: rect(<top>, <right>, <bottom>, <left>) where
// <top> and <bottom> specify offsets from the top border edge of the box, and <right>, and
// <left> specify offsets from the left border edge of the box.
// The value 'auto' means that a given edge of the clipping region will be the same as the edge
// of the element's generated border box (i.e., 'auto' means the same as '0' for <top> and
// <left>, the same as the used value of the height plus the sum of vertical padding and border
// widths for <bottom>, and the same as the used value of the width plus the sum of the
// horizontal padding and border widths for <right>, such that four 'auto' values result in the
// clipping region being the same as the element's border box).
auto left = border_box.left() + (left_edge.is_auto() ? 0 : left_edge.to_px(layout_node)).value();
auto top = border_box.top() + (top_edge.is_auto() ? 0 : top_edge.to_px(layout_node)).value();
auto right = border_box.left() + (right_edge.is_auto() ? border_box.width() : right_edge.to_px(layout_node)).value();
auto bottom = border_box.top() + (bottom_edge.is_auto() ? border_box.height() : bottom_edge.to_px(layout_node)).value();
return Gfx::FloatRect {
left,
top,
right - left,
bottom - top
};
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcNumberSum::resolved_type() const
{
auto maybe_type = first_calc_number_product->resolved_type();
if (!maybe_type.has_value())
return {};
auto type = maybe_type.value();
return resolve_sum_type(type, zero_or_more_additional_calc_number_products);
}
template<typename ProductWithOperator>
static Optional<CalculatedStyleValue::ResolvedType> resolve_product_type(CalculatedStyleValue::ResolvedType first_type, Vector<NonnullOwnPtr<ProductWithOperator>> const& zero_or_more_additional_values)
{
auto type = first_type;
for (auto const& value : zero_or_more_additional_values) {
auto maybe_value_type = value->resolved_type();
if (!maybe_value_type.has_value())
return {};
auto value_type = maybe_value_type.value();
if (value->op == CalculatedStyleValue::ProductOperation::Multiply) {
// At *, check that at least one side is <number>.
if (!(is_number(type) || is_number(value_type)))
return {};
// If both sides are <integer>, resolve to <integer>.
if (type == CalculatedStyleValue::ResolvedType::Integer && value_type == CalculatedStyleValue::ResolvedType::Integer) {
type = CalculatedStyleValue::ResolvedType::Integer;
} else {
// Otherwise, resolve to the type of the other side.
if (is_number(type))
type = value_type;
}
continue;
} else {
VERIFY(value->op == CalculatedStyleValue::ProductOperation::Divide);
// At /, check that the right side is <number>.
if (!is_number(value_type))
return {};
// If the left side is <integer>, resolve to <number>.
if (type == CalculatedStyleValue::ResolvedType::Integer) {
type = CalculatedStyleValue::ResolvedType::Number;
} else {
// Otherwise, resolve to the type of the left side.
}
// FIXME: Division by zero makes the whole calc() expression invalid.
}
}
return type;
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcProduct::resolved_type() const
{
auto maybe_type = first_calc_value.resolved_type();
if (!maybe_type.has_value())
return {};
auto type = maybe_type.value();
return resolve_product_type(type, zero_or_more_additional_calc_values);
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcSumPartWithOperator::resolved_type() const
{
return value->resolved_type();
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcNumberProduct::resolved_type() const
{
auto maybe_type = first_calc_number_value.resolved_type();
if (!maybe_type.has_value())
return {};
auto type = maybe_type.value();
return resolve_product_type(type, zero_or_more_additional_calc_number_values);
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcNumberProductPartWithOperator::resolved_type() const
{
return value.resolved_type();
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcNumberSumPartWithOperator::resolved_type() const
{
return value->resolved_type();
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcProductPartWithOperator::resolved_type() const
{
return value.visit(
[](CalcValue const& calc_value) {
return calc_value.resolved_type();
},
[](CalcNumberValue const& calc_number_value) {
return calc_number_value.resolved_type();
});
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcValue::resolved_type() const
{
return value.visit(
[](Number const& number) -> Optional<CalculatedStyleValue::ResolvedType> {
return { number.is_integer() ? ResolvedType::Integer : ResolvedType::Number };
},
[](Angle const&) -> Optional<CalculatedStyleValue::ResolvedType> { return { ResolvedType::Angle }; },
[](Frequency const&) -> Optional<CalculatedStyleValue::ResolvedType> { return { ResolvedType::Frequency }; },
[](Length const&) -> Optional<CalculatedStyleValue::ResolvedType> { return { ResolvedType::Length }; },
[](Percentage const&) -> Optional<CalculatedStyleValue::ResolvedType> { return { ResolvedType::Percentage }; },
[](Time const&) -> Optional<CalculatedStyleValue::ResolvedType> { return { ResolvedType::Time }; },
[](NonnullOwnPtr<CalcSum> const& sum) { return sum->resolved_type(); });
}
Optional<CalculatedStyleValue::ResolvedType> CalculatedStyleValue::CalcNumberValue::resolved_type() const
{
return value.visit(
[](Number const& number) -> Optional<CalculatedStyleValue::ResolvedType> {
return { number.is_integer() ? ResolvedType::Integer : ResolvedType::Number };
},
[](NonnullOwnPtr<CalcNumberSum> const& sum) { return sum->resolved_type(); });
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberValue::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value.visit(
[&](Number const& number) -> CalculatedStyleValue::CalculationResult {
return CalculatedStyleValue::CalculationResult { number };
},
[&](NonnullOwnPtr<CalcNumberSum> const& sum) -> CalculatedStyleValue::CalculationResult {
return sum->resolve(layout_node, percentage_basis);
});
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcValue::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value.visit(
[&](NonnullOwnPtr<CalcSum> const& sum) -> CalculatedStyleValue::CalculationResult {
return sum->resolve(layout_node, percentage_basis);
},
[&](auto const& v) -> CalculatedStyleValue::CalculationResult {
return CalculatedStyleValue::CalculationResult { v };
});
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcSum::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
auto value = first_calc_product->resolve(layout_node, percentage_basis);
for (auto& additional_product : zero_or_more_additional_calc_products) {
auto additional_value = additional_product->resolve(layout_node, percentage_basis);
if (additional_product->op == CalculatedStyleValue::SumOperation::Add)
value.add(additional_value, layout_node, percentage_basis);
else if (additional_product->op == CalculatedStyleValue::SumOperation::Subtract)
value.subtract(additional_value, layout_node, percentage_basis);
else
VERIFY_NOT_REACHED();
}
return value;
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberSum::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
auto value = first_calc_number_product->resolve(layout_node, percentage_basis);
for (auto& additional_product : zero_or_more_additional_calc_number_products) {
auto additional_value = additional_product->resolve(layout_node, percentage_basis);
if (additional_product->op == CSS::CalculatedStyleValue::SumOperation::Add)
value.add(additional_value, layout_node, percentage_basis);
else if (additional_product->op == CalculatedStyleValue::SumOperation::Subtract)
value.subtract(additional_value, layout_node, percentage_basis);
else
VERIFY_NOT_REACHED();
}
return value;
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcProduct::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
auto value = first_calc_value.resolve(layout_node, percentage_basis);
for (auto& additional_value : zero_or_more_additional_calc_values) {
additional_value->value.visit(
[&](CalculatedStyleValue::CalcValue const& calc_value) {
VERIFY(additional_value->op == CalculatedStyleValue::ProductOperation::Multiply);
auto resolved_value = calc_value.resolve(layout_node, percentage_basis);
value.multiply_by(resolved_value, layout_node);
},
[&](CalculatedStyleValue::CalcNumberValue const& calc_number_value) {
VERIFY(additional_value->op == CalculatedStyleValue::ProductOperation::Divide);
auto resolved_calc_number_value = calc_number_value.resolve(layout_node, percentage_basis);
// FIXME: Checking for division by 0 should happen during parsing.
VERIFY(resolved_calc_number_value.value().get<Number>().value() != 0.0f);
value.divide_by(resolved_calc_number_value, layout_node);
});
}
return value;
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberProduct::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
auto value = first_calc_number_value.resolve(layout_node, percentage_basis);
for (auto& additional_number_value : zero_or_more_additional_calc_number_values) {
auto additional_value = additional_number_value->resolve(layout_node, percentage_basis);
if (additional_number_value->op == CalculatedStyleValue::ProductOperation::Multiply)
value.multiply_by(additional_value, layout_node);
else if (additional_number_value->op == CalculatedStyleValue::ProductOperation::Divide)
value.divide_by(additional_value, layout_node);
else
VERIFY_NOT_REACHED();
}
return value;
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcProductPartWithOperator::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value.visit(
[&](CalcValue const& calc_value) {
return calc_value.resolve(layout_node, percentage_basis);
},
[&](CalcNumberValue const& calc_number_value) {
return calc_number_value.resolve(layout_node, percentage_basis);
});
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcSumPartWithOperator::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value->resolve(layout_node, percentage_basis);
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberProductPartWithOperator::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value.resolve(layout_node, percentage_basis);
}
CalculatedStyleValue::CalculationResult CalculatedStyleValue::CalcNumberSumPartWithOperator::resolve(Layout::Node const* layout_node, PercentageBasis const& percentage_basis) const
{
return value->resolve(layout_node, percentage_basis);
}
CSSPixelPoint PositionValue::resolved(Layout::Node const& node, CSSPixelRect const& rect) const
{
// Note: A preset + a none default x/y_relative_to is impossible in the syntax (and makes little sense)
CSSPixels x = horizontal_position.visit(
[&](HorizontalPreset preset) -> CSSPixels {
return rect.width() * [&] {
switch (preset) {
case HorizontalPreset::Left:
return 0.0f;
case HorizontalPreset::Center:
return 0.5f;
case HorizontalPreset::Right:
return 1.0f;
default:
VERIFY_NOT_REACHED();
}
}();
},
[&](LengthPercentage length_percentage) -> CSSPixels {
return length_percentage.resolved(node, Length::make_px(rect.width())).to_px(node);
});
CSSPixels y = vertical_position.visit(
[&](VerticalPreset preset) -> CSSPixels {
return rect.height() * [&] {
switch (preset) {
case VerticalPreset::Top:
return 0.0f;
case VerticalPreset::Center:
return 0.5f;
case VerticalPreset::Bottom:
return 1.0f;
default:
VERIFY_NOT_REACHED();
}
}();
},
[&](LengthPercentage length_percentage) -> CSSPixels {
return length_percentage.resolved(node, Length::make_px(rect.height())).to_px(node);
});
if (x_relative_to == HorizontalEdge::Right)
x = rect.width() - x;
if (y_relative_to == VerticalEdge::Bottom)
y = rect.height() - y;
return CSSPixelPoint { rect.x() + x, rect.y() + y };
}
ErrorOr<void> PositionValue::serialize(StringBuilder& builder) const
{
// Note: This means our serialization with simplify any with explicit edges that are just `top left`.
bool has_relative_edges = x_relative_to == HorizontalEdge::Right || y_relative_to == VerticalEdge::Bottom;
if (has_relative_edges)
TRY(builder.try_append(x_relative_to == HorizontalEdge::Left ? "left "sv : "right "sv));
TRY(horizontal_position.visit(
[&](HorizontalPreset preset) -> ErrorOr<void> {
return builder.try_append([&] {
switch (preset) {
case HorizontalPreset::Left:
return "left"sv;
case HorizontalPreset::Center:
return "center"sv;
case HorizontalPreset::Right:
return "right"sv;
default:
VERIFY_NOT_REACHED();
}
}());
},
[&](LengthPercentage length_percentage) -> ErrorOr<void> {
return builder.try_appendff(TRY(length_percentage.to_string()));
}));
TRY(builder.try_append(' '));
if (has_relative_edges)
TRY(builder.try_append(y_relative_to == VerticalEdge::Top ? "top "sv : "bottom "sv));
TRY(vertical_position.visit(
[&](VerticalPreset preset) -> ErrorOr<void> {
return builder.try_append([&] {
switch (preset) {
case VerticalPreset::Top:
return "top"sv;
case VerticalPreset::Center:
return "center"sv;
case VerticalPreset::Bottom:
return "bottom"sv;
default:
VERIFY_NOT_REACHED();
}
}());
},
[&](LengthPercentage length_percentage) -> ErrorOr<void> {
return builder.try_append(TRY(length_percentage.to_string()));
}));
return {};
}
ErrorOr<String> ListStyleStyleValue::to_string() const
{
return String::formatted("{} {} {}", TRY(m_properties.position->to_string()), TRY(m_properties.image->to_string()), TRY(m_properties.style_type->to_string()));
}
ErrorOr<String> NumericStyleValue::to_string() const
{
return m_value.visit(
[](auto value) {
return String::formatted("{}", value);
});
}
ErrorOr<String> OverflowStyleValue::to_string() const
{
return String::formatted("{} {}", TRY(m_properties.overflow_x->to_string()), TRY(m_properties.overflow_y->to_string()));
}
ErrorOr<String> PercentageStyleValue::to_string() const
{
return m_percentage.to_string();
}
ErrorOr<String> PositionStyleValue::to_string() const
{
auto to_string = [](PositionEdge edge) {
switch (edge) {
case PositionEdge::Left:
return "left";
case PositionEdge::Right:
return "right";
case PositionEdge::Top:
return "top";
case PositionEdge::Bottom:
return "bottom";
}
VERIFY_NOT_REACHED();
};
return String::formatted("{} {} {} {}", to_string(m_properties.edge_x), TRY(m_properties.offset_x.to_string()), to_string(m_properties.edge_y), TRY(m_properties.offset_y.to_string()));
}
ErrorOr<String> RectStyleValue::to_string() const
{
return String::formatted("rect({} {} {} {})", m_rect.top_edge, m_rect.right_edge, m_rect.bottom_edge, m_rect.left_edge);
}
ErrorOr<String> ShadowStyleValue::to_string() const
{
StringBuilder builder;
TRY(builder.try_appendff("{} {} {} {} {}", m_properties.color.to_deprecated_string(), TRY(m_properties.offset_x.to_string()), TRY(m_properties.offset_y.to_string()), TRY(m_properties.blur_radius.to_string()), TRY(m_properties.spread_distance.to_string())));
if (m_properties.placement == ShadowPlacement::Inner)
TRY(builder.try_append(" inset"sv));
return builder.to_string();
}
ErrorOr<String> TextDecorationStyleValue::to_string() const
{
return String::formatted("{} {} {} {}", TRY(m_properties.line->to_string()), TRY(m_properties.thickness->to_string()), TRY(m_properties.style->to_string()), TRY(m_properties.color->to_string()));
}
ErrorOr<String> TransformationStyleValue::to_string() const
{
StringBuilder builder;
TRY(builder.try_append(CSS::to_string(m_properties.transform_function)));
TRY(builder.try_append('('));
for (size_t i = 0; i < m_properties.values.size(); ++i) {
TRY(builder.try_append(TRY(m_properties.values[i]->to_string())));
if (i != m_properties.values.size() - 1)
TRY(builder.try_append(", "sv));
}
TRY(builder.try_append(')'));
return builder.to_string();
}
bool TransformationStyleValue::Properties::operator==(Properties const& other) const
{
return transform_function == other.transform_function && values.span() == other.values.span();
}
ErrorOr<String> UnresolvedStyleValue::to_string() const
{
StringBuilder builder;
for (auto& value : m_values)
TRY(builder.try_append(TRY(value.to_string())));
return builder.to_string();
}
bool UnresolvedStyleValue::equals(StyleValue const& other) const
{
if (type() != other.type())
return false;
// This is a case where comparing the strings actually makes sense.
return to_string().release_value_but_fixme_should_propagate_errors() == other.to_string().release_value_but_fixme_should_propagate_errors();
}
bool StyleValueList::Properties::operator==(Properties const& other) const
{
return separator == other.separator && values.span() == other.values.span();
}
ErrorOr<String> StyleValueList::to_string() const
{
auto separator = ""sv;
switch (m_properties.separator) {
case Separator::Space:
separator = " "sv;
break;
case Separator::Comma:
separator = ", "sv;
break;
default:
VERIFY_NOT_REACHED();
}
StringBuilder builder;
for (size_t i = 0; i < m_properties.values.size(); ++i) {
TRY(builder.try_append(TRY(m_properties.values[i]->to_string())));
if (i != m_properties.values.size() - 1)
TRY(builder.try_append(separator));
}
return builder.to_string();
}
ValueComparingNonnullRefPtr<RectStyleValue> RectStyleValue::create(EdgeRect rect)
{
return adopt_ref(*new RectStyleValue(rect));
}
ValueComparingNonnullRefPtr<LengthStyleValue> LengthStyleValue::create(Length const& length)
{
if (length.is_auto()) {
static auto value = adopt_ref(*new LengthStyleValue(CSS::Length::make_auto()));
return value;
}
if (length.is_px()) {
if (length.raw_value() == 0) {
static auto value = adopt_ref(*new LengthStyleValue(CSS::Length::make_px(0)));
return value;
}
if (length.raw_value() == 1) {
static auto value = adopt_ref(*new LengthStyleValue(CSS::Length::make_px(1)));
return value;
}
}
return adopt_ref(*new LengthStyleValue(length));
}
Optional<CSS::Length> absolutized_length(CSS::Length const& length, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height)
{
if (length.is_px())
return {};
if (length.is_absolute() || length.is_relative()) {
auto px = length.to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
return CSS::Length::make_px(px);
}
return {};
}
ValueComparingNonnullRefPtr<StyleValue const> StyleValue::absolutized(CSSPixelRect const&, Gfx::FontPixelMetrics const&, CSSPixels, CSSPixels, CSSPixels, CSSPixels) const
{
return *this;
}
ValueComparingNonnullRefPtr<StyleValue const> LengthStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
{
if (auto length = absolutized_length(m_length, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height); length.has_value())
return LengthStyleValue::create(length.release_value());
return *this;
}
ValueComparingNonnullRefPtr<StyleValue const> ShadowStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
{
auto absolutized_offset_x = absolutized_length(m_properties.offset_x, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.offset_x);
auto absolutized_offset_y = absolutized_length(m_properties.offset_y, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.offset_y);
auto absolutized_blur_radius = absolutized_length(m_properties.blur_radius, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.blur_radius);
auto absolutized_spread_distance = absolutized_length(m_properties.spread_distance, viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.spread_distance);
return ShadowStyleValue::create(m_properties.color, absolutized_offset_x, absolutized_offset_y, absolutized_blur_radius, absolutized_spread_distance, m_properties.placement);
}
bool CalculatedStyleValue::contains_percentage() const
{
return m_expression->contains_percentage();
}
bool CalculatedStyleValue::CalcSum::contains_percentage() const
{
if (first_calc_product->contains_percentage())
return true;
for (auto& part : zero_or_more_additional_calc_products) {
if (part->contains_percentage())
return true;
}
return false;
}
bool CalculatedStyleValue::CalcSumPartWithOperator::contains_percentage() const
{
return value->contains_percentage();
}
bool CalculatedStyleValue::CalcProduct::contains_percentage() const
{
if (first_calc_value.contains_percentage())
return true;
for (auto& part : zero_or_more_additional_calc_values) {
if (part->contains_percentage())
return true;
}
return false;
}
bool CalculatedStyleValue::CalcProductPartWithOperator::contains_percentage() const
{
return value.visit(
[](CalcValue const& value) { return value.contains_percentage(); },
[](CalcNumberValue const&) { return false; });
}
bool CalculatedStyleValue::CalcValue::contains_percentage() const
{
return value.visit(
[](Percentage const&) { return true; },
[](NonnullOwnPtr<CalcSum> const& sum) { return sum->contains_percentage(); },
[](auto const&) { return false; });
}
bool calculated_style_value_contains_percentage(CalculatedStyleValue const& value)
{
return value.contains_percentage();
}
}
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