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/*
* Copyright (c) 2024 Igalia S.L.
*
* 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.
*/
#pragma once
#include "SVGElement.h"
#include <wtf/WeakHashSet.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class SVGVisitedElementTracking {
public:
using VisitedSet = WeakHashSet<SVGElement, WeakPtrImplWithEventTargetData>;
SVGVisitedElementTracking(VisitedSet& visitedSet)
: m_visitedElements(visitedSet)
{
}
~SVGVisitedElementTracking() = default;
bool isEmpty() const { return m_visitedElements.isEmptyIgnoringNullReferences(); }
bool isVisiting(const SVGElement& element) { return m_visitedElements.contains(element); }
class Scope {
public:
Scope(SVGVisitedElementTracking& tracking, const SVGElement& element)
: m_tracking(tracking)
, m_element(element)
{
m_tracking.addUnique(element);
}
~Scope()
{
if (RefPtr element = m_element.get())
m_tracking.removeUnique(*element);
}
private:
SVGVisitedElementTracking& m_tracking;
WeakPtr<SVGElement, WeakPtrImplWithEventTargetData> m_element;
};
private:
friend class Scope;
void addUnique(const SVGElement& element)
{
auto result = m_visitedElements.add(element);
ASSERT_UNUSED(result, result.isNewEntry);
}
void removeUnique(const SVGElement& element)
{
bool result = m_visitedElements.remove(element);
ASSERT_UNUSED(result, result);
}
VisitedSet& m_visitedElements;
};
}; // namespace WebCore
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