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ladybird/Libraries/LibWeb/CSS/StyleValues/TransformationStyleValue.cpp
Sam Atkins 1a7f6c8f87 LibWeb/CSS: Define and use serialize_a_number() 
No behaviour change, this just moves things.
2025-08-18 16:52:39 +01:00

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/*
* Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
* Copyright (c) 2024, Steffen T. Larssen <dudedbz@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "TransformationStyleValue.h"
#include <AK/StringBuilder.h>
#include <LibWeb/CSS/Serialize.h>
#include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
#include <LibWeb/CSS/Transformation.h>
namespace Web::CSS {
Transformation TransformationStyleValue::to_transformation() const
{
auto function_metadata = transform_function_metadata(m_properties.transform_function);
Vector<TransformValue> values;
size_t argument_index = 0;
for (auto& transformation_value : m_properties.values) {
auto const function_type = function_metadata.parameters[argument_index].type;
if (transformation_value->is_calculated()) {
auto& calculated = transformation_value->as_calculated();
if (function_type == TransformFunctionParameterType::NumberPercentage
&& (calculated.resolves_to_number() || calculated.resolves_to_percentage())) {
values.append(NumberPercentage { calculated });
} else if (calculated.resolves_to_length_percentage()) {
values.append(LengthPercentage { calculated });
} else if (calculated.resolves_to_number()) {
values.append(NumberPercentage { calculated });
} else if (calculated.resolves_to_angle()) {
values.append(AngleOrCalculated { calculated });
} else {
dbgln("FIXME: Unsupported calc value in transform! {}", calculated.to_string(SerializationMode::Normal));
}
} else if (transformation_value->is_length()) {
values.append({ transformation_value->as_length().length() });
} else if (transformation_value->is_percentage()) {
if (function_type == TransformFunctionParameterType::NumberPercentage) {
values.append(NumberPercentage { transformation_value->as_percentage().percentage() });
} else {
values.append(LengthPercentage { transformation_value->as_percentage().percentage() });
}
} else if (transformation_value->is_number()) {
values.append({ Number(Number::Type::Number, transformation_value->as_number().number()) });
} else if (transformation_value->is_angle()) {
values.append({ transformation_value->as_angle().angle() });
} else {
dbgln("FIXME: Unsupported value in transform! {}", transformation_value->to_string(SerializationMode::Normal));
}
argument_index++;
}
return Transformation { m_properties.transform_function, move(values) };
}
String TransformationStyleValue::to_string(SerializationMode mode) const
{
// https://drafts.csswg.org/css-transforms-2/#individual-transform-serialization
if (m_properties.property == PropertyID::Rotate) {
auto resolve_to_number = [](ValueComparingNonnullRefPtr<StyleValue const> const& value) -> Optional<double> {
if (value->is_number())
return value->as_number().number();
if (value->is_calculated() && value->as_calculated().resolves_to_number())
return value->as_calculated().resolve_number_deprecated({});
VERIFY_NOT_REACHED();
};
// NOTE: Serialize simple rotations directly.
switch (m_properties.transform_function) {
// If the axis is parallel with the x or y axes, it must serialize as the appropriate keyword.
case TransformFunction::RotateX:
return MUST(String::formatted("x {}", m_properties.values[0]->to_string(mode)));
case TransformFunction::RotateY:
return MUST(String::formatted("y {}", m_properties.values[0]->to_string(mode)));
// If a rotation about the z axis (that is, in 2D) is specified, the property must serialize as just an <angle>.
case TransformFunction::Rotate:
case TransformFunction::RotateZ:
return m_properties.values[0]->to_string(mode);
default:
break;
}
auto& rotation_x = m_properties.values[0];
auto& rotation_y = m_properties.values[1];
auto& rotation_z = m_properties.values[2];
auto& angle = m_properties.values[3];
auto x_value = resolve_to_number(rotation_x).value_or(0);
auto y_value = resolve_to_number(rotation_y).value_or(0);
auto z_value = resolve_to_number(rotation_z).value_or(0);
// If the axis is parallel with the x or y axes, it must serialize as the appropriate keyword.
if (x_value > 0.0 && y_value == 0 && z_value == 0)
return MUST(String::formatted("x {}", angle->to_string(mode)));
if (x_value == 0 && y_value > 0.0 && z_value == 0)
return MUST(String::formatted("y {}", angle->to_string(mode)));
// If a rotation about the z axis (that is, in 2D) is specified, the property must serialize as just an <angle>.
if (x_value == 0 && y_value == 0 && z_value > 0.0)
return angle->to_string(mode);
// It must serialize as the keyword none if and only if none was originally specified.
// NOTE: This is handled by returning a keyword from the parser.
// If any other rotation is specified, the property must serialize with an axis specified.
return MUST(String::formatted("{} {} {} {}", rotation_x->to_string(mode), rotation_y->to_string(mode), rotation_z->to_string(mode), angle->to_string(mode)));
}
if (m_properties.property == PropertyID::Scale) {
auto resolve_to_string = [mode](StyleValue const& value) -> String {
Optional<double> raw_value;
if (value.is_number())
raw_value = value.as_number().number();
if (value.is_percentage())
raw_value = value.as_percentage().percentage().as_fraction();
if (value.is_calculated()) {
if (value.as_calculated().resolves_to_number()) {
if (auto resolved = value.as_calculated().resolve_number({}); resolved.has_value())
raw_value = *resolved;
}
if (value.as_calculated().resolves_to_percentage()) {
if (auto resolved = value.as_calculated().resolve_percentage({}); resolved.has_value())
raw_value = resolved->as_fraction();
}
}
if (!raw_value.has_value())
return value.to_string(mode);
return serialize_a_number(*raw_value);
};
auto x_value = resolve_to_string(m_properties.values[0]);
auto y_value = resolve_to_string(m_properties.values[1]);
Optional<String> z_value;
if (m_properties.values.size() == 3 && (!m_properties.values[2]->is_number() || m_properties.values[2]->as_number().number() != 1))
z_value = resolve_to_string(m_properties.values[2]);
StringBuilder builder;
builder.append(x_value);
if (x_value != y_value || (z_value.has_value() && *z_value != "1"sv)) {
builder.append(" "sv);
builder.append(y_value);
}
if (z_value.has_value() && *z_value != "1"sv) {
builder.append(" "sv);
builder.append(z_value.value());
}
return builder.to_string_without_validation();
}
if (m_properties.property == PropertyID::Translate) {
auto resolve_to_string = [mode](StyleValue const& value) -> Optional<String> {
auto string_value = value.to_string(mode);
if (string_value == "0px"_string)
return {};
return string_value;
};
auto x_value = resolve_to_string(m_properties.values[0]);
auto y_value = resolve_to_string(m_properties.values[1]);
Optional<String> z_value;
if (m_properties.values.size() == 3 && (!m_properties.values[2]->is_length() || m_properties.values[2]->as_length().length() != Length::make_px(0)))
z_value = resolve_to_string(m_properties.values[2]);
StringBuilder builder;
builder.append(x_value.value_or("0px"_string));
if (y_value.has_value() || z_value.has_value()) {
builder.append(" "sv);
builder.append(y_value.value_or("0px"_string));
}
if (z_value.has_value()) {
builder.append(" "sv);
builder.append(z_value.value());
}
return builder.to_string_without_validation();
}
StringBuilder builder;
builder.append(CSS::to_string(m_properties.transform_function));
builder.append('(');
for (size_t i = 0; i < m_properties.values.size(); ++i) {
auto const& value = m_properties.values[i];
// https://www.w3.org/TR/css-transforms-2/#individual-transforms
// A <percentage> is equivalent to a <number>, for example scale: 100% is equivalent to scale: 1.
// Numbers are used during serialization of specified and computed values.
if ((m_properties.transform_function == CSS::TransformFunction::Scale
|| m_properties.transform_function == CSS::TransformFunction::Scale3d
|| m_properties.transform_function == CSS::TransformFunction::ScaleX
|| m_properties.transform_function == CSS::TransformFunction::ScaleY
|| m_properties.transform_function == CSS::TransformFunction::ScaleZ)
&& value->is_percentage()) {
builder.append(String::number(value->as_percentage().percentage().as_fraction()));
} else {
builder.append(value->to_string(mode));
}
if (i != m_properties.values.size() - 1)
builder.append(", "sv);
}
builder.append(')');
return MUST(builder.to_string());
}
bool TransformationStyleValue::Properties::operator==(Properties const& other) const
{
return property == other.property
&& transform_function == other.transform_function
&& values.span() == other.values.span();
}
}
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