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LibWeb/CSS: Implement "Convert a CSSUnitValue"

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Sam Atkins 2025-09-11 16:46:39 +01:00 • committed by Jelle Raaijmakers
commit 1c952b01ac
Notes: github-actions[bot] 2025-09-12 11:46:50 +00:00
2 changed files with 78 additions and 0 deletions
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76
Libraries/LibWeb/CSS/CSSUnitValue.cpp
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@ -8,6 +8,7 @@
#include <LibWeb/Bindings/CSSUnitValuePrototype.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/CSS/Serialize.h>
#include <LibWeb/CSS/Units.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::CSS {
@ -95,6 +96,81 @@ String CSSUnitValue::serialize_unit_value(Optional<double> minimum, Optional<dou
return s.to_string_without_validation();
}
// https://drafts.css-houdini.org/css-typed-om-1/#convert-a-cssunitvalue
GC::Ptr<CSSUnitValue> CSSUnitValue::converted_to_unit(FlyString const& unit) const
{
// 1. Let old unit be the value of this’s unit internal slot, and old value be the value of this’s value internal
// slot.
auto old_unit = m_unit;
auto old_value = m_value;
// 2. If old unit and unit are not compatible units, return failure.
double ratio = 1.0;
// NB: If the units are identical, they're always compatible. That also covers cases of `number` and `percent`
// which aren't actually units.
if (old_unit != unit) {
auto old_dimension_type = dimension_for_unit(old_unit);
auto new_dimension_type = dimension_for_unit(unit);
if (!new_dimension_type.has_value() || old_dimension_type != new_dimension_type)
return {};
switch (*new_dimension_type) {
case DimensionType::Angle: {
auto from = string_to_angle_unit(old_unit).release_value();
auto to = string_to_angle_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
case DimensionType::Flex: {
auto from = string_to_angle_unit(old_unit).release_value();
auto to = string_to_angle_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
case DimensionType::Frequency: {
auto from = string_to_frequency_unit(old_unit).release_value();
auto to = string_to_frequency_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
case DimensionType::Length: {
auto from = string_to_length_unit(old_unit).release_value();
auto to = string_to_length_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
case DimensionType::Resolution: {
auto from = string_to_resolution_unit(old_unit).release_value();
auto to = string_to_resolution_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
case DimensionType::Time: {
auto from = string_to_time_unit(old_unit).release_value();
auto to = string_to_time_unit(unit).release_value();
if (!units_are_compatible(from, to))
return {};
ratio = ratio_between_units(from, to);
break;
}
}
}
// 3. Return a new CSSUnitValue whose unit internal slot is set to unit, and whose value internal slot is set to
// old value multiplied by the conversation ratio between old unit and unit.
return CSSUnitValue::create(realm(), old_value * ratio, unit);
}
// https://drafts.css-houdini.org/css-typed-om-1/#equal-numeric-value
bool CSSUnitValue::is_equal_numeric_value(GC::Ref<CSSNumericValue> other) const
{