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/*
* Copyright (C) 2011 Google 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.
*/
#include "config.h"
#include "MutationObserverRegistration.h"
#include "Document.h"
#include "JSNodeCustom.h"
#include "QualifiedName.h"
namespace WebCore {
MutationObserverRegistration::MutationObserverRegistration(MutationObserver& observer, Node& node, MutationObserverOptions options, const MemoryCompactLookupOnlyRobinHoodHashSet<AtomString>& attributeFilter)
: m_observer(observer)
, m_node(node)
, m_options(options)
, m_attributeFilter(attributeFilter)
{
m_observer->observationStarted(*this);
}
MutationObserverRegistration::~MutationObserverRegistration()
{
takeTransientRegistrations();
m_observer->observationEnded(*this);
}
void MutationObserverRegistration::resetObservation(MutationObserverOptions options, const MemoryCompactLookupOnlyRobinHoodHashSet<AtomString>& attributeFilter)
{
takeTransientRegistrations();
m_options = options;
m_attributeFilter = attributeFilter;
}
void MutationObserverRegistration::observedSubtreeNodeWillDetach(Node& node)
{
if (!isSubtree())
return;
node.registerTransientMutationObserver(*this);
m_observer->setHasTransientRegistration(node.document());
if (m_transientRegistrationNodes.isEmpty()) {
ASSERT(!m_nodeKeptAlive);
m_nodeKeptAlive = &m_node; // Balanced in takeTransientRegistrations.
}
m_transientRegistrationNodes.add(node);
}
HashSet<GCReachableRef<Node>> MutationObserverRegistration::takeTransientRegistrations()
{
if (m_transientRegistrationNodes.isEmpty()) {
ASSERT(!m_nodeKeptAlive);
return { };
}
for (auto& node : m_transientRegistrationNodes)
node->unregisterTransientMutationObserver(*this);
auto returnValue = std::exchange(m_transientRegistrationNodes, { });
ASSERT(m_nodeKeptAlive);
m_nodeKeptAlive = nullptr; // Balanced in observeSubtreeNodeWillDetach.
return returnValue;
}
bool MutationObserverRegistration::shouldReceiveMutationFrom(Node& node, MutationObserverOptionType type, const QualifiedName* attributeName) const
{
ASSERT((type == MutationObserverOptionType::Attributes && attributeName) || !attributeName);
if (!m_options.contains(type))
return false;
if (&m_node != &node && !isSubtree())
return false;
if (type != MutationObserverOptionType::Attributes || !m_options.contains(MutationObserverOptionType::AttributeFilter))
return true;
if (!attributeName->namespaceURI().isNull())
return false;
return m_attributeFilter.contains(attributeName->localName());
}
bool MutationObserverRegistration::isReachableFromOpaqueRoots(JSC::AbstractSlotVisitor& visitor) const
{
if (containsWebCoreOpaqueRoot(visitor, m_node))
return true;
for (auto& node : m_transientRegistrationNodes) {
if (containsWebCoreOpaqueRoot(visitor, node.get()))
return true;
}
return false;
}
} // namespace WebCore