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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_COUNTER_DIRECTIVES_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_COUNTER_DIRECTIVES_H_
#include <memory>
#include <optional>
#include "base/memory/ptr_util.h"
#include "base/numerics/checked_math.h"
#include "base/numerics/clamped_math.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
namespace blink {
class CounterDirectives {
DISALLOW_NEW();
public:
CounterDirectives() = default;
// FIXME: The code duplication here could possibly be replaced by using two
// maps, or by using a container that held two generic Directive objects.
bool IsReset() const { return !!reset_value_; }
int ResetValue() const { return *reset_value_; }
void SetResetValue(int value) { reset_value_ = value; }
void ClearReset() { reset_value_.reset(); }
void InheritReset(const CounterDirectives& parent) {
reset_value_ = parent.reset_value_;
}
bool IsIncrement() const { return !!increment_value_; }
int IncrementValue() const { return *increment_value_; }
void AddIncrementValue(int value) {
increment_value_ = base::ClampAdd(increment_value_.value_or(0), value);
}
void ClearIncrement() { increment_value_.reset(); }
void InheritIncrement(const CounterDirectives& parent) {
increment_value_ = parent.increment_value_;
}
bool IsSet() const { return !!set_value_; }
int SetValue() const { return *set_value_; }
void SetSetValue(int value) { set_value_ = value; }
void ClearSet() { set_value_.reset(); }
void InheritSet(const CounterDirectives& parent) {
set_value_ = parent.set_value_;
}
bool IsDefined() const { return IsReset() || IsIncrement() || IsSet(); }
int CombinedValue() const {
// If there is a counter-set, it overrides over values.
// https://drafts.csswg.org/css-lists-3/#auto-numbering
if (IsSet()) {
return SetValue();
}
// According to the spec, if an increment would overflow or underflow the
// counter, we are allowed to ignore the increment.
// https://drafts.csswg.org/css-lists-3/#valdef-counter-reset-custom-ident-integer
return base::CheckAdd(reset_value_.value_or(0),
increment_value_.value_or(0))
.ValueOrDefault(reset_value_.value_or(0));
}
friend bool operator==(const CounterDirectives&, const CounterDirectives&);
private:
std::optional<int> reset_value_;
std::optional<int> increment_value_;
std::optional<int> set_value_;
};
inline bool operator!=(const CounterDirectives& a, const CounterDirectives& b) {
return !(a == b);
}
// Not to be deleted through a pointer to HashMap.
class CounterDirectiveMap : public HashMap<AtomicString, CounterDirectives> {
public:
std::unique_ptr<CounterDirectiveMap> Clone() const {
return base::WrapUnique(new CounterDirectiveMap(*this));
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_COUNTER_DIRECTIVES_H_
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