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/*
* Copyright (C) 2015-2022 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.
*/
#pragma once
#include "GCReachableRef.h"
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
namespace JSC {
class JSGlobalObject;
class CallFrame;
}
namespace WebCore {
class CustomElementReactionQueueItem;
class Document;
class Element;
class JSCustomElementInterface;
class QualifiedName;
// https://html.spec.whatwg.org/multipage/custom-elements.html#element-queue
class CustomElementQueue {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(CustomElementQueue);
public:
CustomElementQueue() = default;
void add(Element&);
void processQueue(JSC::JSGlobalObject*);
private:
void invokeAll();
Vector<GCReachableRef<Element>> m_elements;
bool m_invoking { false };
};
class CustomElementReactionQueue {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(CustomElementReactionQueue);
public:
CustomElementReactionQueue(JSCustomElementInterface&);
~CustomElementReactionQueue();
static void enqueueElementUpgrade(Element&, bool alreadyScheduledToUpgrade);
static void tryToUpgradeElement(Element&);
static void enqueueConnectedCallbackIfNeeded(Element&);
static void enqueueDisconnectedCallbackIfNeeded(Element&);
static void enqueueAdoptedCallbackIfNeeded(Element&, Document& oldDocument, Document& newDocument);
static void enqueueAttributeChangedCallbackIfNeeded(Element&, const QualifiedName&, const AtomString& oldValue, const AtomString& newValue);
static void enqueuePostUpgradeReactions(Element&);
bool observesStyleAttribute() const;
void invokeAll(Element&);
void clear();
bool isEmpty() const { return m_items.isEmpty(); }
#if ASSERT_ENABLED
bool hasJustUpgradeReaction() const;
#endif
static void processBackupQueue(CustomElementQueue&);
private:
static void enqueueElementOnAppropriateElementQueue(Element&);
Ref<JSCustomElementInterface> m_interface;
Vector<CustomElementReactionQueueItem> m_items;
};
class CustomElementReactionDisallowedScope {
public:
CustomElementReactionDisallowedScope()
{
#if ASSERT_ENABLED
s_customElementReactionDisallowedCount++;
#endif
}
~CustomElementReactionDisallowedScope()
{
#if ASSERT_ENABLED
ASSERT(s_customElementReactionDisallowedCount);
s_customElementReactionDisallowedCount--;
#endif
}
#if ASSERT_ENABLED
static bool isReactionAllowed() { return !s_customElementReactionDisallowedCount; }
#endif
class AllowedScope {
#if ASSERT_ENABLED
public:
AllowedScope()
: m_originalCount(s_customElementReactionDisallowedCount)
{
s_customElementReactionDisallowedCount = 0;
}
~AllowedScope()
{
s_customElementReactionDisallowedCount = m_originalCount;
}
private:
unsigned m_originalCount;
#endif // ASSERT_ENABLED
};
private:
#if ASSERT_ENABLED
WEBCORE_EXPORT static unsigned s_customElementReactionDisallowedCount;
friend class AllowedScope;
#endif
};
class CustomElementReactionStack : public CustomElementReactionDisallowedScope::AllowedScope {
public:
ALWAYS_INLINE CustomElementReactionStack(JSC::JSGlobalObject* state)
: m_previousProcessingStack(s_currentProcessingStack)
, m_state(state)
{
s_currentProcessingStack = this;
}
ALWAYS_INLINE CustomElementReactionStack(JSC::JSGlobalObject& state)
: CustomElementReactionStack(&state)
{ }
ALWAYS_INLINE ~CustomElementReactionStack()
{
if (UNLIKELY(m_queue))
processQueue(m_state);
s_currentProcessingStack = m_previousProcessingStack;
}
private:
WEBCORE_EXPORT void processQueue(JSC::JSGlobalObject*);
CustomElementQueue* m_queue { nullptr }; // Use raw pointer to avoid generating delete in the destructor.
CustomElementReactionStack* const m_previousProcessingStack;
JSC::JSGlobalObject* const m_state;
WEBCORE_EXPORT static CustomElementReactionStack* s_currentProcessingStack;
friend CustomElementReactionQueue;
};
}
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