Refactoring: Have isDefaultSlotName function

third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/shadow/SlotAssignment.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLSlotElement.h"
 
 namespace blink {
 
 HTMLSlotElement* SlotAssignment::assignedSlotFor(const Node& node) const
 {
     return m_assignment.get(const_cast<Node*>(&node));
 }
 
 static void detachNotAssignedNode(Node& node)
 {
     if (node.layoutObject())
         node.lazyReattachIfAttached();
 }
 
+inline static bool isDefaultSlotName(const AtomicString& name)
+{
+    return name.isNull() || name.isEmpty();
+}
+
 void SlotAssignment::resolveAssignment(ShadowRoot& shadowRoot)
 {
     m_assignment.clear();
 
     using Name2Slot = WillBeHeapHashMap<AtomicString, RefPtrWillBeMember<HTMLSlotElement>>;
     Name2Slot name2slot;
     HTMLSlotElement* defaultSlot = nullptr;
 
     const WillBeHeapVector<RefPtrWillBeMember<HTMLSlotElement>>& slots = shadowRoot.descendantSlots();
 
     for (RefPtrWillBeMember<HTMLSlotElement> slot : slots) {
         slot->clearDistribution();
         AtomicString name = slot->fastGetAttribute(HTMLNames::nameAttr);
-        if (name.isNull() || name.isEmpty()) {
+        if (isDefaultSlotName(name)) {
             if (!defaultSlot)
                 defaultSlot = slot.get();
         } else {
             name2slot.add(name, slot.get());
         }
     }
 
     for (Node& child : NodeTraversal::childrenOf(*shadowRoot.host())) {
         if (child.isElementNode()) {
             if (isActiveInsertionPoint(child)) {
                 // TODO(hayato): Support re-distribution across v0 and v1 shadow trees
                 detachNotAssignedNode(child);
                 continue;
             }
             AtomicString slotName = toElement(child).fastGetAttribute(HTMLNames::slotAttr);
-            if (slotName.isNull() || slotName.isEmpty()) {
+            if (isDefaultSlotName(slotName)) {
                 if (defaultSlot)
                     assign(child, *defaultSlot);
                 else
                     detachNotAssignedNode(child);
             } else {
                 HTMLSlotElement* slot = name2slot.get(slotName);
                 if (slot)
                     assign(child, *slot);
                 else
                     detachNotAssignedNode(child);
@@ skipping 26 matching lines @@
 }
 
 DEFINE_TRACE(SlotAssignment)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_assignment);
 #endif
 }
 
 } // namespace blink