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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 "QualifiedName.h"
namespace WebCore {
MutationObserverRegistration::MutationObserverRegistration(MutationObserver& observer, Node& node, MutationObserverOptions options, const HashSet<AtomicString>& 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 HashSet<AtomicString>& attributeFilter)
{
takeTransientRegistrations();
m_options = options;
m_attributeFilter = attributeFilter;
}
void MutationObserverRegistration::observedSubtreeNodeWillDetach(Node& node)
{
if (!isSubtree())
return;
node.registerTransientMutationObserver(*this);
m_observer->setHasTransientRegistration();
if (!m_transientRegistrationNodes) {
m_transientRegistrationNodes = std::make_unique<HashSet<GCReachableRef<Node>>>();
ASSERT(!m_nodeKeptAlive);
m_nodeKeptAlive = &m_node; // Balanced in takeTransientRegistrations.
}
m_transientRegistrationNodes->add(node);
}
std::unique_ptr<HashSet<GCReachableRef<Node>>> MutationObserverRegistration::takeTransientRegistrations()
{
if (!m_transientRegistrationNodes) {
ASSERT(!m_nodeKeptAlive);
return nullptr;
}
for (auto& node : *m_transientRegistrationNodes)
node->unregisterTransientMutationObserver(*this);
auto returnValue = WTFMove(m_transientRegistrationNodes);
ASSERT(m_nodeKeptAlive);
m_nodeKeptAlive = nullptr; // Balanced in observeSubtreeNodeWillDetach.
return returnValue;
}
bool MutationObserverRegistration::shouldReceiveMutationFrom(Node& node, MutationObserver::MutationType type, const QualifiedName* attributeName) const
{
ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
if (!(m_options & type))
return false;
if (&m_node != &node && !isSubtree())
return false;
if (type != MutationObserver::Attributes || !(m_options & MutationObserver::AttributeFilter))
return true;
if (!attributeName->namespaceURI().isNull())
return false;
return m_attributeFilter.contains(attributeName->localName());
}
void MutationObserverRegistration::addRegistrationNodesToSet(HashSet<Node*>& nodes) const
{
nodes.add(&m_node);
if (!m_transientRegistrationNodes)
return;
for (auto& node : *m_transientRegistrationNodes)
nodes.add(node.ptr());
}
} // namespace WebCore