178 lines
5.3 KiB
C++
178 lines
5.3 KiB
C++
/*
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* Copyright (C) 2015, 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "GCReachableRef.h"
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#include <wtf/Forward.h>
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#include <wtf/Noncopyable.h>
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#include <wtf/Vector.h>
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namespace JSC {
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class JSGlobalObject;
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class CallFrame;
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}
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namespace WebCore {
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class CustomElementReactionQueueItem;
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class Document;
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class Element;
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class JSCustomElementInterface;
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class QualifiedName;
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// https://html.spec.whatwg.org/multipage/custom-elements.html#element-queue
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class CustomElementQueue {
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WTF_MAKE_FAST_ALLOCATED;
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WTF_MAKE_NONCOPYABLE(CustomElementQueue);
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public:
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CustomElementQueue() = default;
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void add(Element&);
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void processQueue(JSC::JSGlobalObject*);
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private:
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void invokeAll();
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Vector<GCReachableRef<Element>> m_elements;
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bool m_invoking { false };
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};
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class CustomElementReactionQueue {
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WTF_MAKE_FAST_ALLOCATED;
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WTF_MAKE_NONCOPYABLE(CustomElementReactionQueue);
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public:
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CustomElementReactionQueue(JSCustomElementInterface&);
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~CustomElementReactionQueue();
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static void enqueueElementUpgrade(Element&, bool alreadyScheduledToUpgrade);
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static void tryToUpgradeElement(Element&);
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static void enqueueConnectedCallbackIfNeeded(Element&);
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static void enqueueDisconnectedCallbackIfNeeded(Element&);
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static void enqueueAdoptedCallbackIfNeeded(Element&, Document& oldDocument, Document& newDocument);
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static void enqueueAttributeChangedCallbackIfNeeded(Element&, const QualifiedName&, const AtomString& oldValue, const AtomString& newValue);
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static void enqueuePostUpgradeReactions(Element&);
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bool observesStyleAttribute() const;
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void invokeAll(Element&);
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void clear();
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bool isEmpty() const { return m_items.isEmpty(); }
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#if ASSERT_ENABLED
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bool hasJustUpgradeReaction() const;
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#endif
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static void processBackupQueue(CustomElementQueue&);
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private:
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static void enqueueElementOnAppropriateElementQueue(Element&);
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Ref<JSCustomElementInterface> m_interface;
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Vector<CustomElementReactionQueueItem> m_items;
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};
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class CustomElementReactionDisallowedScope {
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public:
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CustomElementReactionDisallowedScope()
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{
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#if ASSERT_ENABLED
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s_customElementReactionDisallowedCount++;
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#endif
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}
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~CustomElementReactionDisallowedScope()
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{
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#if ASSERT_ENABLED
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ASSERT(s_customElementReactionDisallowedCount);
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s_customElementReactionDisallowedCount--;
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#endif
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}
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#if ASSERT_ENABLED
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static bool isReactionAllowed() { return !s_customElementReactionDisallowedCount; }
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#endif
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class AllowedScope {
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#if ASSERT_ENABLED
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public:
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AllowedScope()
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: m_originalCount(s_customElementReactionDisallowedCount)
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{
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s_customElementReactionDisallowedCount = 0;
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}
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~AllowedScope()
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{
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s_customElementReactionDisallowedCount = m_originalCount;
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}
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private:
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unsigned m_originalCount;
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#endif // ASSERT_ENABLED
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};
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private:
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#if ASSERT_ENABLED
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WEBCORE_EXPORT static unsigned s_customElementReactionDisallowedCount;
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friend class AllowedScope;
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#endif
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};
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class CustomElementReactionStack : public CustomElementReactionDisallowedScope::AllowedScope {
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public:
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ALWAYS_INLINE CustomElementReactionStack(JSC::JSGlobalObject* state)
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: m_previousProcessingStack(s_currentProcessingStack)
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, m_state(state)
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{
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s_currentProcessingStack = this;
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}
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ALWAYS_INLINE CustomElementReactionStack(JSC::JSGlobalObject& state)
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: CustomElementReactionStack(&state)
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{ }
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ALWAYS_INLINE ~CustomElementReactionStack()
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{
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if (UNLIKELY(m_queue))
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processQueue(m_state);
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s_currentProcessingStack = m_previousProcessingStack;
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}
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private:
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WEBCORE_EXPORT void processQueue(JSC::JSGlobalObject*);
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CustomElementQueue* m_queue { nullptr }; // Use raw pointer to avoid generating delete in the destructor.
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CustomElementReactionStack* m_previousProcessingStack;
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JSC::JSGlobalObject* m_state;
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WEBCORE_EXPORT static CustomElementReactionStack* s_currentProcessingStack;
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friend CustomElementReactionQueue;
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};
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}
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