Implement Custom Elements' attributeChangedCallback.

Source/core/dom/CustomElementCallbackDispatcher.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
@@ skipping 13 matching lines @@
  * 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/CustomElementCallbackDispatcher.h"
 
+#include "core/dom/CustomElementCallbackInvocation.h"
 #include "wtf/MainThread.h"
 
 namespace WebCore {
 
 size_t CustomElementCallbackDispatcher::s_elementQueueStart = 0;
 
 // The base of the stack has a null sentinel value.
 size_t CustomElementCallbackDispatcher::s_elementQueueEnd = 1;
 
 CustomElementCallbackDispatcher& CustomElementCallbackDispatcher::instance()
 {
     DEFINE_STATIC_LOCAL(CustomElementCallbackDispatcher, instance, ());
     return instance;
 }
 
+void CustomElementCallbackDispatcher::enqueueAttributeChangedCallback(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue)
+{
+    if (!callbacks->hasAttributeChanged())
+        return;
+
+    CustomElementCallbackQueue* queue = ensureCallbackQueue(callbacks, element);
+    bool isInCurrentQueue = queue->owner() == currentElementQueue();
+    if (!isInCurrentQueue) {
+        queue->setOwner(currentElementQueue());
+        m_flattenedProcessingStack.append(queue);
+        s_elementQueueEnd++;
+    }
+
+    queue->append(CustomElementCallbackInvocation::createAttributeChangedInvocation(name, oldValue, newValue));
+}
+
 void CustomElementCallbackDispatcher::enqueueCreatedCallback(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element)
 {
-    Element* key = element.get();
-    ElementCallbackQueueMap::AddResult result = m_elementCallbackQueueMap.add(key, CustomElementCallbackQueue::create(callbacks, element));
-    ASSERT(result.isNewEntry); // creation callbacks are always scheduled first
+    if (!callbacks->hasCreated())
+        return;
 
-    CustomElementCallbackQueue* queue = result.iterator->value.get();
+    CustomElementCallbackQueue* queue = createCallbackQueue(callbacks, element);
     queue->setOwner(currentElementQueue());
-    queue->append(CustomElementLifecycleCallbacks::Created);
 
     // The created callback is unique in being prepended to the front
     // of the element queue
     m_flattenedProcessingStack.insert(inCallbackDeliveryScope() ? s_elementQueueStart : /* skip null sentinel */ 1, queue);
     s_elementQueueEnd++;
+
+    queue->append(CustomElementCallbackInvocation::createCreatedInvocation());
 }
 
 // Dispatches callbacks at microtask checkpoint.
 bool CustomElementCallbackDispatcher::dispatch()
 {
     ASSERT(isMainThread());
-    ASSERT(!inCallbackDeliveryScope());
+    if (inCallbackDeliveryScope())
+        return false;
+
     size_t start = 1; // skip null sentinel
     size_t end = s_elementQueueEnd;
 
     for (size_t i = start; i < end; i++) {
         m_flattenedProcessingStack[i]->processInElementQueue(currentElementQueue());
 
         // new callbacks as a result of recursion must be scheduled in
         // a CallbackDeliveryScope which restore this queue on completion
         ASSERT(!s_elementQueueStart);
         ASSERT(s_elementQueueEnd == end);
@@ skipping 29 matching lines @@
     }
 
     // Pop the element queue from the processing stack
     m_flattenedProcessingStack.resize(start);
     s_elementQueueEnd = start;
 
     if (start == /* allow sentinel */ 1)
         m_elementCallbackQueueMap.clear();
 }
 
+CustomElementCallbackQueue* CustomElementCallbackDispatcher::createCallbackQueue(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element)
+{
+    Element* key = element.get();
+    ElementCallbackQueueMap::AddResult result = m_elementCallbackQueueMap.add(key, CustomElementCallbackQueue::create(callbacks, element));
+    ASSERT(result.isNewEntry);
+    return result.iterator->value.get();
+}
+
+CustomElementCallbackQueue* CustomElementCallbackDispatcher::ensureCallbackQueue(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, PassRefPtr<Element> element)
+{
+    Element* key = element.get();
+    ElementCallbackQueueMap::iterator it = m_elementCallbackQueueMap.find(key);
+    if (it == m_elementCallbackQueueMap.end())
+        it = m_elementCallbackQueueMap.add(key, CustomElementCallbackQueue::create(callbacks, element)).iterator;
+    return it->value.get();
+}
+
 } // namespace WebCore