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LibWeb: Introduce CalculatedOr type
This is intended as a replacement for Length and friends each holding a `RefPtr<CalculatedStyleValue>`. Instead, let's make the types explicit about whether they are calculated or not. This then means a Length is always a Length, and won't require including `StyleValue.h`. As noted, it's probably nicer for LengthOrCalculated to live in `Length.h`, but we can't do that until Length stops including `StyleValue.h`.
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5 changed files with 206 additions and 4 deletions
155
Userland/Libraries/LibWeb/CSS/CalculatedOr.h
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155
Userland/Libraries/LibWeb/CSS/CalculatedOr.h
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/*
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* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Variant.h>
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#include <LibWeb/CSS/Angle.h>
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#include <LibWeb/CSS/Frequency.h>
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#include <LibWeb/CSS/Length.h>
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#include <LibWeb/CSS/Percentage.h>
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#include <LibWeb/CSS/StyleValue.h>
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#include <LibWeb/CSS/Time.h>
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namespace Web::CSS {
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template<typename T>
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class CalculatedOr {
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public:
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CalculatedOr(T t)
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: m_value(move(t))
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{
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}
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CalculatedOr(NonnullRefPtr<CalculatedStyleValue> calculated)
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: m_value(move(calculated))
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{
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}
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virtual ~CalculatedOr() = default;
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bool is_calculated() const { return m_value.template has<NonnullRefPtr<CalculatedStyleValue>>(); }
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T const& value() const
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{
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VERIFY(!is_calculated());
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return m_value.template get<T>();
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}
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NonnullRefPtr<CalculatedStyleValue> const& calculated() const
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{
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VERIFY(is_calculated());
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return m_value.template get<NonnullRefPtr<CalculatedStyleValue>>();
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}
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virtual T resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const = 0;
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T resolved(Layout::Node const& layout_node) const
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{
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return m_value.visit(
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[&](T const& t) {
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return t;
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},
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[&](NonnullRefPtr<CalculatedStyleValue> const& calculated) {
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return resolve_calculated(calculated, layout_node);
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});
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}
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ErrorOr<String> to_string() const
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{
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if (is_calculated())
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return m_value.template get<NonnullRefPtr<CalculatedStyleValue>>()->to_string();
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return m_value.template get<T>().to_string();
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}
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bool operator==(CalculatedOr<T> const& other) const
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{
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if (is_calculated() || other.is_calculated())
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return false;
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return (m_value.template get<T>() == other.m_value.template get<T>());
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}
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private:
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Variant<T, NonnullRefPtr<CalculatedStyleValue>> m_value;
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};
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class AngleOrCalculated : public CalculatedOr<Angle> {
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public:
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using CalculatedOr<Angle>::CalculatedOr;
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Angle resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const override;
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};
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class FrequencyOrCalculated : public CalculatedOr<Frequency> {
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public:
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using CalculatedOr<Frequency>::CalculatedOr;
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Frequency resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const override;
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};
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class LengthOrCalculated : public CalculatedOr<Length> {
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public:
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using CalculatedOr<Length>::CalculatedOr;
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Length resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const override;
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};
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class PercentageOrCalculated : public CalculatedOr<Percentage> {
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public:
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using CalculatedOr<Percentage>::CalculatedOr;
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Percentage resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const override;
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};
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class TimeOrCalculated : public CalculatedOr<Time> {
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public:
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using CalculatedOr<Time>::CalculatedOr;
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Time resolve_calculated(NonnullRefPtr<CalculatedStyleValue> const&, Layout::Node const&) const override;
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};
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}
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template<>
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struct AK::Formatter<Web::CSS::AngleOrCalculated> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::AngleOrCalculated const& calculated_or)
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{
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return Formatter<StringView>::format(builder, TRY(calculated_or.to_string()));
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}
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};
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template<>
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struct AK::Formatter<Web::CSS::FrequencyOrCalculated> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::FrequencyOrCalculated const& calculated_or)
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{
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return Formatter<StringView>::format(builder, TRY(calculated_or.to_string()));
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}
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};
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template<>
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struct AK::Formatter<Web::CSS::LengthOrCalculated> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::LengthOrCalculated const& calculated_or)
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{
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return Formatter<StringView>::format(builder, TRY(calculated_or.to_string()));
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}
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};
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template<>
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struct AK::Formatter<Web::CSS::PercentageOrCalculated> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::PercentageOrCalculated const& calculated_or)
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{
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return Formatter<StringView>::format(builder, TRY(calculated_or.to_string()));
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}
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};
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template<>
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struct AK::Formatter<Web::CSS::TimeOrCalculated> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::TimeOrCalculated const& calculated_or)
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{
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return Formatter<StringView>::format(builder, TRY(calculated_or.to_string()));
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}
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};
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