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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_IF_CONDITION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_IF_CONDITION_H_
#include "third_party/blink/renderer/core/css/media_list.h"
#include "third_party/blink/renderer/core/css/media_query.h"
#include "third_party/blink/renderer/core/css/media_query_exp.h"
#include "third_party/blink/renderer/core/media_type_names.h"
namespace blink {
// https://drafts.csswg.org/css-values-5/#typedef-if-condition
class CORE_EXPORT IfCondition : public GarbageCollected<IfCondition> {
public:
virtual ~IfCondition() = default;
virtual void Trace(Visitor*) const {}
enum class Type {
kStyle,
kMedia,
kSupports,
kNot,
kAnd,
kOr,
kUnknown,
kElse
};
virtual Type GetType() const = 0;
// These helper functions return nullptr if any argument is nullptr.
static const IfCondition* Not(const IfCondition*);
static const IfCondition* And(const IfCondition*, const IfCondition*);
static const IfCondition* Or(const IfCondition*, const IfCondition*);
};
class IfConditionNot : public IfCondition {
public:
explicit IfConditionNot(const IfCondition* operand) : operand_(operand) {}
void Trace(Visitor* visitor) const override;
Type GetType() const override { return Type::kNot; }
const IfCondition& Operand() const { return *operand_; }
private:
Member<const IfCondition> operand_;
};
class IfConditionAnd : public IfCondition {
public:
IfConditionAnd(const IfCondition* left, const IfCondition* right)
: left_(left), right_(right) {}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kAnd; }
const IfCondition& Left() const { return *left_; }
const IfCondition& Right() const { return *right_; }
private:
Member<const IfCondition> left_;
Member<const IfCondition> right_;
};
class IfConditionOr : public IfCondition {
public:
IfConditionOr(const IfCondition* left, const IfCondition* right)
: left_(left), right_(right) {}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kOr; }
const IfCondition& Left() const { return *left_; }
const IfCondition& Right() const { return *right_; }
private:
Member<const IfCondition> left_;
Member<const IfCondition> right_;
};
class CORE_EXPORT IfTestStyle : public IfCondition {
public:
explicit IfTestStyle(const MediaQueryExpNode* style_test)
: style_test_(style_test) {}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kStyle; }
const MediaQueryExpNode* GetMediaQueryExpNode() const { return style_test_; }
private:
Member<const MediaQueryExpNode> style_test_;
};
class CORE_EXPORT IfTestMedia : public IfCondition {
public:
explicit IfTestMedia(const MediaQueryExpNode* exp_node) {
HeapVector<Member<const MediaQuery>> queries;
queries.push_back(MakeGarbageCollected<MediaQuery>(
MediaQuery::RestrictorType::kNone, media_type_names::kAll, exp_node));
media_test_ = MakeGarbageCollected<MediaQuerySet>(std::move(queries));
}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kMedia; }
const MediaQuerySet* GetMediaQuerySet() const { return media_test_; }
private:
Member<const MediaQuerySet> media_test_;
};
class CORE_EXPORT IfTestSupports : public IfCondition {
public:
explicit IfTestSupports(bool result) : result_(result) {}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kSupports; }
bool GetResult() const { return result_; }
private:
bool result_;
};
class CORE_EXPORT IfConditionUnknown : public IfCondition {
public:
explicit IfConditionUnknown(String string) : string_(string) {}
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kUnknown; }
String GetString() const { return string_; }
private:
String string_;
};
class CORE_EXPORT IfConditionElse : public IfCondition {
public:
explicit IfConditionElse() = default;
void Trace(Visitor*) const override;
Type GetType() const override { return Type::kElse; }
};
template <>
struct DowncastTraits<IfConditionNot> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kNot;
}
};
template <>
struct DowncastTraits<IfConditionAnd> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kAnd;
}
};
template <>
struct DowncastTraits<IfConditionOr> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kOr;
}
};
template <>
struct DowncastTraits<IfTestStyle> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kStyle;
}
};
template <>
struct DowncastTraits<IfTestMedia> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kMedia;
}
};
template <>
struct DowncastTraits<IfTestSupports> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kSupports;
}
};
template <>
struct DowncastTraits<IfConditionUnknown> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kUnknown;
}
};
template <>
struct DowncastTraits<IfConditionElse> {
static bool AllowFrom(const IfCondition& node) {
return node.GetType() == IfCondition::Type::kElse;
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_IF_CONDITION_H_
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