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/*
* Copyright (C) 2015, 2016 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "CustomElementReactionQueue.h"
#include "CustomElementRegistry.h"
#include "DOMWindow.h"
#include "Document.h"
#include "Element.h"
#include "HTMLNames.h"
#include "JSCustomElementInterface.h"
#include "JSDOMBinding.h"
#include "Microtasks.h"
#include <JavaScriptCore/CatchScope.h>
#include <JavaScriptCore/Heap.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/Optional.h>
#include <wtf/Ref.h>
#include <wtf/SetForScope.h>
namespace WebCore {
class CustomElementReactionQueueItem {
public:
enum class Type {
ElementUpgrade,
Connected,
Disconnected,
Adopted,
AttributeChanged,
};
CustomElementReactionQueueItem(Type type)
: m_type(type)
{ }
CustomElementReactionQueueItem(Document& oldDocument, Document& newDocument)
: m_type(Type::Adopted)
, m_oldDocument(&oldDocument)
, m_newDocument(&newDocument)
{ }
CustomElementReactionQueueItem(const QualifiedName& attributeName, const AtomString& oldValue, const AtomString& newValue)
: m_type(Type::AttributeChanged)
, m_attributeName(attributeName)
, m_oldValue(oldValue)
, m_newValue(newValue)
{ }
Type type() const { return m_type; }
void invoke(Element& element, JSCustomElementInterface& elementInterface)
{
switch (m_type) {
case Type::ElementUpgrade:
elementInterface.upgradeElement(element);
break;
case Type::Connected:
elementInterface.invokeConnectedCallback(element);
break;
case Type::Disconnected:
elementInterface.invokeDisconnectedCallback(element);
break;
case Type::Adopted:
elementInterface.invokeAdoptedCallback(element, *m_oldDocument, *m_newDocument);
break;
case Type::AttributeChanged:
ASSERT(m_attributeName);
elementInterface.invokeAttributeChangedCallback(element, m_attributeName.value(), m_oldValue, m_newValue);
break;
}
}
private:
Type m_type;
RefPtr<Document> m_oldDocument;
RefPtr<Document> m_newDocument;
Optional<QualifiedName> m_attributeName;
AtomString m_oldValue;
AtomString m_newValue;
};
CustomElementReactionQueue::CustomElementReactionQueue(JSCustomElementInterface& elementInterface)
: m_interface(elementInterface)
{ }
CustomElementReactionQueue::~CustomElementReactionQueue()
{
ASSERT(m_items.isEmpty());
}
void CustomElementReactionQueue::clear()
{
m_items.clear();
}
void CustomElementReactionQueue::enqueueElementUpgrade(Element& element, bool alreadyScheduledToUpgrade)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (alreadyScheduledToUpgrade) {
ASSERT(queue.m_items.size() == 1);
ASSERT(queue.m_items[0].type() == CustomElementReactionQueueItem::Type::ElementUpgrade);
} else {
queue.m_items.append({CustomElementReactionQueueItem::Type::ElementUpgrade});
enqueueElementOnAppropriateElementQueue(element);
}
}
void CustomElementReactionQueue::enqueueElementUpgradeIfDefined(Element& element)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isCustomElementUpgradeCandidate());
auto* window = element.document().domWindow();
if (!window)
return;
auto* registry = window->customElementRegistry();
if (!registry)
return;
auto* elementInterface = registry->findInterface(element);
if (!elementInterface)
return;
element.enqueueToUpgrade(*elementInterface);
}
void CustomElementReactionQueue::enqueueConnectedCallbackIfNeeded(Element& element)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isDefinedCustomElement());
ASSERT(element.document().refCount() > 0);
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (!queue.m_interface->hasConnectedCallback())
return;
queue.m_items.append({CustomElementReactionQueueItem::Type::Connected});
enqueueElementOnAppropriateElementQueue(element);
}
void CustomElementReactionQueue::enqueueDisconnectedCallbackIfNeeded(Element& element)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isDefinedCustomElement());
if (element.document().refCount() <= 0)
return; // Don't enqueue disconnectedCallback if the entire document is getting destructed.
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (!queue.m_interface->hasDisconnectedCallback())
return;
queue.m_items.append({CustomElementReactionQueueItem::Type::Disconnected});
enqueueElementOnAppropriateElementQueue(element);
}
void CustomElementReactionQueue::enqueueAdoptedCallbackIfNeeded(Element& element, Document& oldDocument, Document& newDocument)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isDefinedCustomElement());
ASSERT(element.document().refCount() > 0);
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (!queue.m_interface->hasAdoptedCallback())
return;
queue.m_items.append({oldDocument, newDocument});
enqueueElementOnAppropriateElementQueue(element);
}
void CustomElementReactionQueue::enqueueAttributeChangedCallbackIfNeeded(Element& element, const QualifiedName& attributeName, const AtomString& oldValue, const AtomString& newValue)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isDefinedCustomElement());
ASSERT(element.document().refCount() > 0);
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (!queue.m_interface->observesAttribute(attributeName.localName()))
return;
queue.m_items.append({attributeName, oldValue, newValue});
enqueueElementOnAppropriateElementQueue(element);
}
void CustomElementReactionQueue::enqueuePostUpgradeReactions(Element& element)
{
ASSERT(CustomElementReactionDisallowedScope::isReactionAllowed());
ASSERT(element.isCustomElementUpgradeCandidate());
if (!element.hasAttributes() && !element.isConnected())
return;
ASSERT(element.reactionQueue());
auto& queue = *element.reactionQueue();
if (element.hasAttributes()) {
for (auto& attribute : element.attributesIterator()) {
if (queue.m_interface->observesAttribute(attribute.localName()))
queue.m_items.append({attribute.name(), nullAtom(), attribute.value()});
}
}
if (element.isConnected() && queue.m_interface->hasConnectedCallback())
queue.m_items.append({CustomElementReactionQueueItem::Type::Connected});
}
bool CustomElementReactionQueue::observesStyleAttribute() const
{
return m_interface->observesAttribute(HTMLNames::styleAttr->localName());
}
void CustomElementReactionQueue::invokeAll(Element& element)
{
while (!m_items.isEmpty()) {
Vector<CustomElementReactionQueueItem> items = WTFMove(m_items);
for (auto& item : items)
item.invoke(element, m_interface.get());
}
}
inline void CustomElementReactionQueue::ElementQueue::add(Element& element)
{
ASSERT(!m_invoking);
// FIXME: Avoid inserting the same element multiple times.
m_elements.append(element);
}
inline void CustomElementReactionQueue::ElementQueue::invokeAll()
{
RELEASE_ASSERT(!m_invoking);
SetForScope<bool> invoking(m_invoking, true);
unsigned originalSize = m_elements.size();
// It's possible for more elements to be enqueued if some IDL attributes were missing CEReactions.
// Invoke callbacks slightly later here instead of crashing / ignoring those cases.
for (unsigned i = 0; i < m_elements.size(); ++i) {
auto& element = m_elements[i].get();
auto* queue = element.reactionQueue();
ASSERT(queue);
queue->invokeAll(element);
}
ASSERT_UNUSED(originalSize, m_elements.size() == originalSize);
m_elements.clear();
}
inline void CustomElementReactionQueue::ElementQueue::processQueue(JSC::ExecState* state)
{
if (!state) {
invokeAll();
return;
}
auto& vm = state->vm();
JSC::JSLockHolder lock(vm);
JSC::Exception* previousException = nullptr;
{
auto catchScope = DECLARE_CATCH_SCOPE(vm);
previousException = catchScope.exception();
if (previousException)
catchScope.clearException();
}
invokeAll();
if (previousException) {
auto throwScope = DECLARE_THROW_SCOPE(vm);
throwException(state, throwScope, previousException);
}
}
// https://html.spec.whatwg.org/multipage/custom-elements.html#enqueue-an-element-on-the-appropriate-element-queue
void CustomElementReactionQueue::enqueueElementOnAppropriateElementQueue(Element& element)
{
ASSERT(element.reactionQueue());
if (!CustomElementReactionStack::s_currentProcessingStack) {
auto& queue = ensureBackupQueue();
queue.add(element);
return;
}
auto*& queue = CustomElementReactionStack::s_currentProcessingStack->m_queue;
if (!queue) // We use a raw pointer to avoid genearing code to delete it in ~CustomElementReactionStack.
queue = new ElementQueue;
queue->add(element);
}
#if !ASSERT_DISABLED
unsigned CustomElementReactionDisallowedScope::s_customElementReactionDisallowedCount = 0;
#endif
CustomElementReactionStack* CustomElementReactionStack::s_currentProcessingStack = nullptr;
void CustomElementReactionStack::processQueue(JSC::ExecState* state)
{
ASSERT(m_queue);
m_queue->processQueue(state);
delete m_queue;
m_queue = nullptr;
}
class BackupElementQueueMicrotask final : public Microtask {
WTF_MAKE_FAST_ALLOCATED;
private:
Result run() final
{
CustomElementReactionQueue::processBackupQueue();
return Result::Done;
}
};
static bool s_processingBackupElementQueue = false;
CustomElementReactionQueue::ElementQueue& CustomElementReactionQueue::ensureBackupQueue()
{
if (!s_processingBackupElementQueue) {
s_processingBackupElementQueue = true;
MicrotaskQueue::mainThreadQueue().append(makeUnique<BackupElementQueueMicrotask>());
}
return backupElementQueue();
}
void CustomElementReactionQueue::processBackupQueue()
{
backupElementQueue().processQueue(nullptr);
s_processingBackupElementQueue = false;
}
CustomElementReactionQueue::ElementQueue& CustomElementReactionQueue::backupElementQueue()
{
static NeverDestroyed<ElementQueue> queue;
return queue.get();
}
}