Remove the concept of document.documentElement

sky/engine/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 232 matching lines @@
     , m_startTime(currentTime())
     , m_renderView(0)
 #if !ENABLE(OILPAN)
     , m_weakFactory(this)
 #endif
     , m_contextDocument(initializer.contextDocument())
     , m_loadEventDelayCount(0)
     , m_loadEventDelayTimer(this, &Document::loadEventDelayTimerFired)
     , m_didSetReferrerPolicy(false)
     , m_referrerPolicy(ReferrerPolicyDefault)
-    , m_directionSetOnDocumentElement(false)
     , m_registrationContext(initializer.registrationContext())
     , m_elementDataCacheClearTimer(this, &Document::elementDataCacheClearTimerFired)
     , m_timeline(AnimationTimeline::create(this))
     , m_templateDocumentHost(nullptr)
     , m_hasViewportUnits(false)
     , m_styleRecalcElementCounter(0)
 {
     setClient(this);
 
     if (!m_registrationContext)
@@ skipping 83 matching lines @@
 void Document::dispose()
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
 
     // We must make sure not to be retaining any of our children through
     // these extra pointers or we will create a reference cycle.
     m_focusedElement = nullptr;
     m_hoverNode = nullptr;
     m_activeHoverElement = nullptr;
     m_titleElement = nullptr;
-    m_documentElement = nullptr;
     m_userActionElements.documentDidRemoveLastRef();
 
     detachParser();
 
     m_registrationContext.clear();
 
     if (m_importsController)
         HTMLImportsController::removeFrom(*this);
 
     // removeDetachedChildren() doesn't always unregister IDs,
@@ skipping 35 matching lines @@
 }
 
 Location* Document::location() const
 {
     if (!frame())
         return 0;
 
     return &domWindow()->location();
 }
 
-void Document::childrenChanged(const ChildrenChange& change)
-{
-    ContainerNode::childrenChanged(change);
-    m_documentElement = ElementTraversal::firstWithin(*this);
-}
-
 PassRefPtr<Element> Document::createElement(const AtomicString& name, ExceptionState& exceptionState)
 {
     if (!isValidName(name)) {
         exceptionState.ThrowDOMException(InvalidCharacterError, "The tag name provided ('" + name + "') is not a valid name.");
         return nullptr;
     }
 
     return HTMLElementFactory::createHTMLElement(name, *this, false);
 }
 
@@ skipping 607 matching lines @@
 
     // Uncomment to enable printing of statistics about style sharing and the matched property cache.
     // Optionally pass StyleResolver::ReportSlowStats to print numbers that require crawling the
     // entire DOM (where collecting them is very slow).
     // FIXME: Expose this as a runtime flag.
     // styleResolver().enableStats(/*StyleResolver::ReportSlowStats*/);
 
     if (StyleResolverStats* stats = styleResolver().stats())
         stats->reset();
 
-    if (Element* documentElement = this->documentElement()) {
-        if (documentElement->shouldCallRecalcStyle(change))
-            documentElement->recalcStyle(change);
+    for (Element* element = ElementTraversal::firstChild(*this); element; element = ElementTraversal::nextSibling(*element)) {
+        if (element->shouldCallRecalcStyle(change))
+            element->recalcStyle(change);
     }
 
     styleResolver().printStats();
 
     view()->recalcOverflowAfterStyleChange();
 
     clearChildNeedsStyleRecalc();
 
     m_styleEngine->resolver().clearStyleSharingList();
 
@@ skipping 1102 matching lines @@
     return &m_documentLoadTiming;
 }
 
 IntSize Document::initialViewportSize() const
 {
     if (!view())
         return IntSize();
     return view()->unscaledVisibleContentSize();
 }
 
-Node* eventTargetNodeForDocument(Document* doc)
-{
-    if (!doc)
-        return 0;
-    Node* node = doc->focusedElement();
-    if (!node)
-        node = doc->documentElement();
-    return node;
-}
-
 void Document::decrementActiveParserCount()
 {
     --m_activeParserCount;
 }
 
 Document& Document::ensureTemplateDocument()
 {
     if (isTemplateDocument())
         return *this;
 
@@ skipping 20 matching lines @@
 
 DocumentLifecycleNotifier& Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier&>(LifecycleContext<Document>::lifecycleNotifier());
 }
 
 Element* Document::activeElement() const
 {
     if (Element* element = treeScope().adjustedFocusedElement())
         return element;
-    return documentElement();
+    return nullptr;
 }
 
 void Document::getTransitionElementData(Vector<TransitionElementData>& elementData)
 {
 }
 
 bool Document::hasFocus() const
 {
     Page* page = this->page();
     if (!page)
@@ skipping 10 matching lines @@
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif