Custom Elements: Encapsulates Async and Sync Queues into one class.

Source/core/dom/custom/CustomElementMicrotaskQueue.cpp

-/*
- * Copyright (C) 2013 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:
- *
- * 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.
- * 3. 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 "core/dom/custom/CustomElementMicrotaskQueue.h"
-
-#include "core/dom/custom/CustomElementCallbackDispatcher.h"
-
-namespace WebCore {
-
-class MicrotaskQueueInvocationScope {
-public:
-#if defined(NDEBUG)
-    explicit MicrotaskQueueInvocationScope(CustomElementMicrotaskQueueBase*) { }
-#else
-    explicit MicrotaskQueueInvocationScope(CustomElementMicrotaskQueueBase* queue)
-        : m_parent(s_top)
-        , m_queue(queue)
-    {
-        s_top = this;
-        ASSERT(m_queue->isEmpty() || !hasReenter());
-    }
-
-    ~MicrotaskQueueInvocationScope()
-    {
-        s_top = m_parent;
-    }
-
-private:
-    bool hasReenter() const
-    {
-        for (MicrotaskQueueInvocationScope* scope = this->m_parent; scope; scope = scope->m_parent) {
-            if (scope->m_queue == m_queue)
-                return true;
-        }
-
-        return false;
-    }
-
-    MicrotaskQueueInvocationScope* m_parent;
-    CustomElementMicrotaskQueueBase* m_queue;
-
-    static MicrotaskQueueInvocationScope* s_top;
-#endif
-};
-
-#if !defined(NDEBUG)
-MicrotaskQueueInvocationScope* MicrotaskQueueInvocationScope::s_top = 0;
-#endif
-
-void CustomElementMicrotaskQueueBase::dispatch()
-{
-    MicrotaskQueueInvocationScope scope(this);
-    doDispatch();
-}
-
-void CustomElementMicrotaskQueueBase::trace(Visitor* visitor)
-{
-    visitor->trace(m_queue);
-}
-
-#if !defined(NDEBUG)
-void CustomElementMicrotaskQueueBase::show(unsigned indent)
-{
-    for (unsigned q = 0; q < m_queue.size(); ++q) {
-        if (m_queue[q])
-            m_queue[q]->show(indent);
-        else
-            fprintf(stderr, "%*snull\n", indent, "");
-    }
-}
-#endif
-
-void CustomElementMicrotaskQueue::enqueue(PassOwnPtrWillBeRawPtr<CustomElementMicrotaskStep> step)
-{
-    m_queue.append(step);
-}
-
-void CustomElementMicrotaskQueue::doDispatch()
-{
-    unsigned i;
-
-    for (i = 0; i < m_queue.size(); ++i) {
-        if (CustomElementMicrotaskStep::Processing == m_queue[i]->process())
-            break;
-    }
-
-    m_queue.remove(0, i);
-}
-
-} // namespace WebCore