Implement cloneNode for Document

Source/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 3085 matching lines @@
             break;
         }
     }
 
     if (numElements > 1 || numDoctypes > 1)
         return false;
 
     return true;
 }
 
-PassRefPtr<Node> Document::cloneNode(bool /*deep*/)
+PassRefPtr<Node> Document::cloneNode(bool deep)
 {
-    // Spec says cloning Document nodes is "implementation dependent"
-    // so we do not support it...
-    return 0;
+    RefPtr<Document> clone = cloneDocumentWithoutChildren();
+    clone->cloneDataFromDocument(*this);
+    if (deep)
+        cloneChildNodes(clone.get());
+    return clone.release();
+}
+
+PassRefPtr<Document> Document::cloneDocumentWithoutChildren()
+{
+    DocumentInit init(url());
+    if (isXHTMLDocument())
+        return createXHTML(init.withRegistrationContext(registrationContext()));
+    return create(init);
+}
+
+void Document::cloneDataFromDocument(const Document& other)
+{
+    setCompatibilityMode(other.compatibilityMode());
+    setEncoding(other.encoding());
+    setContextFeatures(other.contextFeatures());
+    setSecurityOrigin(other.securityOrigin()->isolatedCopy());
 }
 
 StyleSheetList* Document::styleSheets()
 {
     if (!m_styleSheetList)
         m_styleSheetList = StyleSheetList::create(this);
     return m_styleSheetList.get();
 }
 
 String Document::preferredStylesheetSet() const
@@ skipping 2169 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore