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134 lines
4.4 KiB
C++
134 lines
4.4 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 "CSSMathInvert.h"
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#include <LibWeb/Bindings/CSSMathInvertPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(CSSMathInvert);
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GC::Ref<CSSMathInvert> CSSMathInvert::create(JS::Realm& realm, NumericType type, GC::Ref<CSSNumericValue> values)
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{
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return realm.create<CSSMathInvert>(realm, move(type), move(values));
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssmathinvert-cssmathinvert
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WebIDL::ExceptionOr<GC::Ref<CSSMathInvert>> CSSMathInvert::construct_impl(JS::Realm& realm, CSSNumberish value)
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{
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// The CSSMathInvert(arg) constructor is defined identically to the above, except that in the last step it returns
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// a new CSSMathInvert object.
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// NB: So, the steps below are a modification of the CSSMathNegate steps.
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// 1. Replace arg with the result of rectifying a numberish value for arg.
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auto converted_value = rectify_a_numberish_value(realm, value);
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// 2. Return a new CSSMathInvert whose value internal slot is set to arg.
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return CSSMathInvert::create(realm, converted_value->type().inverted(), converted_value);
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}
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CSSMathInvert::CSSMathInvert(JS::Realm& realm, NumericType type, GC::Ref<CSSNumericValue> values)
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: CSSMathValue(realm, Bindings::CSSMathOperator::Invert, move(type))
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, m_value(move(values))
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{
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}
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CSSMathInvert::~CSSMathInvert() = default;
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void CSSMathInvert::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSMathInvert);
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Base::initialize(realm);
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}
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void CSSMathInvert::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_value);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#serialize-a-cssmathvalue
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String CSSMathInvert::serialize_math_value(Nested nested, Parens parens) const
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{
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// NB: Only steps 1 and 6 apply here.
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// 1. Let s initially be the empty string.
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StringBuilder s;
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// 6. Otherwise, if this is a CSSMathInvert:
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{
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// 1. If paren-less is true, continue to the next step; otherwise, if nested is true, append "(" to s;
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// otherwise, append "calc(" to s.
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if (parens == Parens::With) {
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if (nested == Nested::Yes) {
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s.append("("sv);
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} else {
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s.append("calc("sv);
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}
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}
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// 2. Append "1 / " to s.
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s.append("1 / "sv);
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// 3. Serialize this’s value internal slot with nested set to true, and append the result to s.
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s.append(m_value->to_string({ .nested = true }));
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// 4. If paren-less is false, append ")" to s,
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if (parens == Parens::With)
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s.append(")"sv);
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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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// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssmathinvert-value
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GC::Ref<CSSNumericValue> CSSMathInvert::value() const
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{
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return m_value;
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#equal-numeric-value
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bool CSSMathInvert::is_equal_numeric_value(GC::Ref<CSSNumericValue> other) const
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{
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// NB: Only steps 1, 4 and 5 are relevant.
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// 1. If value1 and value2 are not members of the same interface, return false.
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auto* other_invert = as_if<CSSMathInvert>(*other);
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if (!other_invert)
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return false;
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// 4. Assert: value1 and value2 are both CSSMathNegates or CSSMathInverts.
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// 5. Return whether value1’s value and value2’s value are equal numeric values.
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return m_value->is_equal_numeric_value(other_invert->m_value);
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}
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// https://drafts.css-houdini.org/css-typed-om-1/#create-a-sum-value
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Optional<SumValue> CSSMathInvert::create_a_sum_value() const
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{
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// 1. Let values be the result of creating a sum value from this’s value internal slot.
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auto values = m_value->create_a_sum_value();
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// 2. If values is failure, return failure.
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if (!values.has_value())
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return {};
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// 3. If the length of values is more than one, return failure.
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if (values->size() > 1)
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return {};
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// 4. Invert (find the reciprocal of) the value of the item in values, and negate the value of each entry in its unit map.
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for (auto& [value, unit_map] : *values) {
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value = 1.0 / value;
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for (auto& [_, power] : unit_map)
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power = -power;
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}
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// 5. Return values.
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return values;
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}
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}
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