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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ExceptionOr.h"
#include "GCReachableRef.h"
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#include <wtf/IsoMalloc.h>
#include <wtf/OptionSet.h>
#include <wtf/Vector.h>
#include <wtf/WeakHashSet.h>
namespace JSC {
class AbstractSlotVisitor;
}
namespace WebCore {
class Document;
class HTMLSlotElement;
class MutationCallback;
class MutationObserverRegistration;
class MutationRecord;
class Node;
class WindowEventLoop;
enum class MutationObserverOptionType : uint8_t {
// MutationType
ChildList = 1 << 0,
Attributes = 1 << 1,
CharacterData = 1 << 2,
// ObservationFlags
Subtree = 1 << 3,
AttributeFilter = 1 << 4,
// DeliveryFlags
AttributeOldValue = 1 << 5,
CharacterDataOldValue = 1 << 6,
};
using MutationObserverOptions = OptionSet<MutationObserverOptionType>;
using MutationRecordDeliveryOptions = OptionSet<MutationObserverOptionType>;
class MutationObserver final : public RefCounted<MutationObserver> {
WTF_MAKE_ISO_ALLOCATED(MutationObserver);
public:
static Ref<MutationObserver> create(Ref<MutationCallback>&&);
~MutationObserver();
struct Init {
bool childList;
std::optional<bool> attributes;
std::optional<bool> characterData;
bool subtree;
std::optional<bool> attributeOldValue;
std::optional<bool> characterDataOldValue;
std::optional<Vector<AtomString>> attributeFilter;
};
ExceptionOr<void> observe(Node&, const Init&);
struct TakenRecords {
Vector<Ref<MutationRecord>> records;
HashSet<GCReachableRef<Node>> pendingTargets;
};
TakenRecords takeRecords();
void disconnect();
void observationStarted(MutationObserverRegistration&);
void observationEnded(MutationObserverRegistration&);
void enqueueMutationRecord(Ref<MutationRecord>&&);
void setHasTransientRegistration(Document&);
bool canDeliver();
bool isReachableFromOpaqueRoots(JSC::AbstractSlotVisitor&) const;
MutationCallback& callback() const { return m_callback.get(); }
static void enqueueSlotChangeEvent(HTMLSlotElement&);
static void notifyMutationObservers(WindowEventLoop&);
using OptionType = MutationObserverOptionType;
static constexpr MutationObserverOptions AllMutationTypes { OptionType::ChildList, OptionType::Attributes, OptionType::CharacterData };
static constexpr MutationObserverOptions AllDeliveryFlags { OptionType::AttributeOldValue, OptionType::CharacterDataOldValue };
private:
explicit MutationObserver(Ref<MutationCallback>&&);
void deliver();
static bool validateOptions(MutationObserverOptions);
Ref<MutationCallback> m_callback;
Vector<Ref<MutationRecord>> m_records;
HashSet<GCReachableRef<Node>> m_pendingTargets;
WeakHashSet<MutationObserverRegistration> m_registrations;
unsigned m_priority;
};
} // namespace WebCore
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