Avoid checks in createElementNS overload

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 751 matching lines @@
         if (exceptionState.hadException())
             return 0;
     }
 
     if (RuntimeEnabledFeatures::customElementsEnabled() && !typeExtension.isEmpty())
         CustomElementRegistrationContext::setIsAttributeAndTypeExtension(element.get(), typeExtension);
 
     return element;
 }
 
+static inline QualifiedName createQualifiedName(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState& exceptionState)
+{
+    AtomicString prefix, localName;
+    if (!Document::parseQualifiedName(qualifiedName, prefix, localName, exceptionState))
+        return nullQName();
+
+    QualifiedName qName(prefix, localName, namespaceURI);
+    if (!Document::hasValidNamespaceForElements(qName)) {
+        exceptionState.throwDOMException(NamespaceError, "The namespace URI provided ('" + namespaceURI + "') is not valid for the qualified name provided ('" + qualifiedName + "').");
+        return nullQName();
+    }
+
+    return qName;
+}
+
+PassRefPtr<Element> Document::createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState& exceptionState)
+{
+    QualifiedName qName(createQualifiedName(namespaceURI, qualifiedName, exceptionState));
+    if (qName == nullQName())
+        return 0;
+
+    return createElement(qName, false);
+}
+
 PassRefPtr<Element> Document::createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, const AtomicString& typeExtension, ExceptionState& exceptionState)
 {
-    AtomicString prefix, localName;
-    if (!parseQualifiedName(qualifiedName, prefix, localName, exceptionState))
+    QualifiedName qName(createQualifiedName(namespaceURI, qualifiedName, exceptionState));
+    if (qName == nullQName())
         return 0;
 
-    QualifiedName qName(prefix, localName, namespaceURI);
-    if (!hasValidNamespaceForElements(qName)) {
-        exceptionState.throwDOMException(NamespaceError, "The namespace URI provided ('" + namespaceURI + "') is not valid for the qualified name provided ('" + qualifiedName + "').");
-        return 0;
-    }
-
     RefPtr<Element> element;
-    if (CustomElement::isValidName(qName.localName()) && registrationContext()) {
+    if (CustomElement::isValidName(qName.localName()) && registrationContext())
         element = registrationContext()->createCustomTagElement(*this, qName);
-    } else {
-        element = createElementNS(namespaceURI, qualifiedName, exceptionState);
-        if (exceptionState.hadException())
-            return 0;
-    }
+    else
+        element = createElement(qName, false);
 
     if (!typeExtension.isEmpty())
         CustomElementRegistrationContext::setIsAttributeAndTypeExtension(element.get(), typeExtension);
 
     return element;
 }
 
 ScriptValue Document::registerElement(WebCore::ScriptState* state, const AtomicString& name, ExceptionState& exceptionState)
 {
     return registerElement(state, name, Dictionary(), exceptionState);
@@ skipping 276 matching lines @@
 }
 
 NamedFlowCollection* Document::namedFlows()
 {
     if (!m_namedFlows)
         m_namedFlows = NamedFlowCollection::create(this);
 
     return m_namedFlows.get();
 }
 
-PassRefPtr<Element> Document::createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState& exceptionState)
-{
-    AtomicString prefix, localName;
-    if (!parseQualifiedName(qualifiedName, prefix, localName, exceptionState))
-        return 0;
-
-    QualifiedName qName(prefix, localName, namespaceURI);
-    if (!hasValidNamespaceForElements(qName)) {
-        exceptionState.throwDOMException(NamespaceError, "The namespace URI provided ('" + namespaceURI + "') is not valid for the qualified name provided ('" + qualifiedName + "').");
-        return 0;
-    }
-
-    return createElement(qName, false);
-}
-
 String Document::readyState() const
 {
     DEFINE_STATIC_LOCAL(const String, loading, ("loading"));
     DEFINE_STATIC_LOCAL(const String, interactive, ("interactive"));
     DEFINE_STATIC_LOCAL(const String, complete, ("complete"));
 
     switch (m_readyState) {
     case Loading:
         return loading;
     case Interactive:
@@ skipping 4313 matching lines @@
 void Document::defaultEventHandler(Event* event)
 {
     if (frame() && frame()->remotePlatformLayer()) {
         frame()->chromeClient().forwardInputEvent(this, event);
         return;
     }
     Node::defaultEventHandler(event);
 }
 
 } // namespace WebCore