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/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DeprecatedString.h>
namespace Web::CSS {
// Corresponds to Kleene 3-valued logic.
// https://www.w3.org/TR/mediaqueries-4/#evaluating
enum class MatchResult {
False,
True,
Unknown,
};
inline MatchResult as_match_result(bool value)
{
return value ? MatchResult::True : MatchResult::False;
}
inline 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();
}
template<typename Collection, typename Evaluate>
inline MatchResult evaluate_and(Collection& collection, Evaluate evaluate)
{
size_t true_results = 0;
for (auto& item : collection) {
auto item_match = evaluate(item);
if (item_match == MatchResult::False)
return MatchResult::False;
if (item_match == MatchResult::True)
true_results++;
}
if (true_results == collection.size())
return MatchResult::True;
return MatchResult::Unknown;
}
template<typename Collection, typename Evaluate>
inline MatchResult evaluate_or(Collection& collection, Evaluate evaluate)
{
size_t false_results = 0;
for (auto& item : collection) {
auto item_match = evaluate(item);
if (item_match == MatchResult::True)
return MatchResult::True;
if (item_match == MatchResult::False)
false_results++;
}
if (false_results == collection.size())
return MatchResult::False;
return MatchResult::Unknown;
}
// https://www.w3.org/TR/mediaqueries-4/#typedef-general-enclosed
class GeneralEnclosed {
public:
GeneralEnclosed(DeprecatedString serialized_contents)
: m_serialized_contents(move(serialized_contents))
{
}
MatchResult evaluate() const { return MatchResult::Unknown; }
StringView to_string() const { return m_serialized_contents.view(); }
private:
DeprecatedString m_serialized_contents;
};
}
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