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98 lines
3.8 KiB
C++
98 lines
3.8 KiB
C++
/*
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* Copyright (c) 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 "CSSUnitValue.h"
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#include <LibWeb/Bindings/CSSUnitValuePrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/Serialize.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSUnitValue);
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GC::Ref<CSSUnitValue> CSSUnitValue::create(JS::Realm& realm, double value, FlyString unit)
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{
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// The type of a CSSUnitValue is the result of creating a type from its unit internal slot.
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// https://drafts.css-houdini.org/css-typed-om-1/#type-of-a-cssunitvalue
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auto numeric_type = NumericType::create_from_unit(unit);
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return realm.create<CSSUnitValue>(realm, value, move(unit), numeric_type.release_value());
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssunitvalue-cssunitvalue
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WebIDL::ExceptionOr<GC::Ref<CSSUnitValue>> CSSUnitValue::construct_impl(JS::Realm& realm, double value, FlyString unit)
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{
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// 1. If creating a type from unit returns failure, throw a TypeError and abort this algorithm.
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auto numeric_type = NumericType::create_from_unit(unit);
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if (!numeric_type.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("Cannot create CSSUnitValue with unrecognized unit '{}'", unit)) };
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// 2. Return a new CSSUnitValue with its value internal slot set to value and its unit set to unit.
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return realm.create<CSSUnitValue>(realm, value, move(unit), numeric_type.release_value());
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}
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CSSUnitValue::CSSUnitValue(JS::Realm& realm, double value, FlyString unit, NumericType type)
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: CSSNumericValue(realm, move(type))
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, m_value(value)
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// AD-HOC: WPT expects the unit to be lowercase but this doesn't seem to be specified anywhere.
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, m_unit(unit.to_ascii_lowercase())
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{
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}
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void CSSUnitValue::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSUnitValue);
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Base::initialize(realm);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssunitvalue-value
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void CSSUnitValue::set_value(double value)
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{
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// AD-HOC: No definition: https://github.com/w3c/css-houdini-drafts/issues/1146
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m_value = value;
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#serialize-a-cssunitvalue
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String CSSUnitValue::serialize_unit_value(Optional<double> minimum, Optional<double> maximum) const
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{
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// To serialize a CSSUnitValue this, with optional arguments minimum, a numeric value, and maximum, a numeric value:
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// 1. Let value and unit be this‘s value and unit internal slots.
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// 2. Set s to the result of serializing a <number> from value, per CSSOM §6.7.2 Serializing CSS Values.
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StringBuilder s;
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serialize_a_number(s, m_value);
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// 3. If unit is:
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// -> "number"
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if (m_unit == "number"_fly_string) {
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// Do nothing.
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}
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// -> "percent"
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else if (m_unit == "percent"_fly_string) {
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// Append "%" to s.
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s.append("%"sv);
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}
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// -> anything else
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else {
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// Append unit to s.
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s.append(m_unit.to_ascii_lowercase());
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}
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// 4. If minimum was passed and this is less than minimum, or if maximum was passed and this is greater than
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// maximum, or either minimum and/or maximum were passed and the relative size of this and minimum/maximum can’t
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// be determined with the available information at this time, prepend "calc(" to s, then append ")" to s.
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if ((minimum.has_value() && m_value < minimum.value())
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|| (maximum.has_value() && m_value > maximum.value())) {
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// FIXME: "or either minimum and/or maximum were passed and the relative size of this and minimum/maximum can’t be determined with the available information at this time"
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return MUST(String::formatted("calc({})", s.string_view()));
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}
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// 5. Return s.
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return s.to_string_without_validation();
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}
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}
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