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// Copyright 2024 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_STYLE_GAP_DATA_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GAP_DATA_H_
#include "third_party/blink/renderer/core/css/style_color.h"
#include "third_party/blink/renderer/core/style/computed_style_base_constants.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
namespace blink {
template <typename T>
class CORE_EXPORT ValueRepeater : public GarbageCollected<ValueRepeater<T>> {
public:
using VectorType = typename std::conditional<WTF::IsTraceable<T>::value,
HeapVector<T, 1>,
Vector<T>>::type;
ValueRepeater() = default;
explicit ValueRepeater(VectorType repeated_values,
std::optional<wtf_size_t> repeat_count)
: repeated_values_(repeated_values), repeat_count_(repeat_count) {
CHECK(repeated_values_.size() > 0);
}
bool operator==(const ValueRepeater& other) const {
return repeated_values_ == other.repeated_values_ &&
repeat_count_ == other.repeat_count_;
}
bool IsAutoRepeater() const { return !repeat_count_.has_value(); }
const VectorType& RepeatedValues() const { return repeated_values_; }
wtf_size_t RepeatCount() const {
CHECK(repeat_count_.has_value());
return repeat_count_.value();
}
void Trace(Visitor* visitor) const {
TraceIfNeeded<VectorType>::Trace(visitor, repeated_values_);
}
private:
VectorType repeated_values_;
std::optional<wtf_size_t> repeat_count_ = std::nullopt;
};
// A GapData is a single value or a ValueRepeater.
template <typename T>
class CORE_EXPORT GapData {
DISALLOW_NEW();
public:
GapData() = default;
explicit GapData(T value) : value_(value) {}
explicit GapData(ValueRepeater<T>* value_repeater)
: value_repeater_(value_repeater) {}
void Trace(Visitor* visitor) const {
TraceIfNeeded<T>::Trace(visitor, value_);
visitor->Trace(value_repeater_);
}
bool operator==(const GapData& other) const {
return value_ == other.value_ &&
base::ValuesEquivalent(value_repeater_, other.value_repeater_);
}
const T GetValue() const {
CHECK(!value_repeater_);
return value_;
}
const ValueRepeater<T>* GetValueRepeater() const {
CHECK(value_repeater_);
return value_repeater_.Get();
}
bool IsRepeaterData() const { return value_repeater_ != nullptr; }
private:
T value_ = T();
Member<ValueRepeater<T>> value_repeater_;
};
} // namespace blink
WTF_ALLOW_CLEAR_UNUSED_SLOTS_WITH_MEM_FUNCTIONS(
blink::GapData<blink::StyleColor>)
WTF_ALLOW_CLEAR_UNUSED_SLOTS_WITH_MEM_FUNCTIONS(blink::GapData<int>)
WTF_ALLOW_CLEAR_UNUSED_SLOTS_WITH_MEM_FUNCTIONS(
blink::GapData<blink::EBorderStyle>)
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GAP_DATA_H_
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