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/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullOwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <AK/Variant.h>
#include <AK/Vector.h>
#include <LibWeb/CSS/Parser/StyleDeclarationRule.h>
namespace Web::CSS {
class Supports final : public RefCounted<Supports> {
friend class Parser;
private:
enum class MatchResult {
False,
True,
Unknown,
};
static MatchResult negate(MatchResult value)
{
switch (value) {
case MatchResult::False:
return MatchResult::True;
case MatchResult::True:
return MatchResult::False;
case MatchResult::Unknown:
return MatchResult::Unknown;
}
VERIFY_NOT_REACHED();
}
public:
struct GeneralEnclosed {
};
struct Feature {
// FIXME: Using this internal parser class is a bit of a hack.
StyleDeclarationRule declaration;
MatchResult evaluate() const;
};
struct Condition;
struct InParens {
Variant<NonnullOwnPtr<Condition>, Feature, GeneralEnclosed> value;
MatchResult evaluate() const;
};
struct Condition {
enum class Type {
Not,
And,
Or,
};
Type type;
Vector<InParens> children;
MatchResult evaluate() const;
};
static NonnullRefPtr<Supports> create(NonnullOwnPtr<Condition>&& condition)
{
return adopt_ref(*new Supports(move(condition)));
}
bool matches() const { return m_matches; }
private:
Supports(NonnullOwnPtr<Condition>&&);
NonnullOwnPtr<Condition> m_condition;
bool m_matches { false };
};
}
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