Move a member function parentEditingBoundary() out from PositionAlgorithm<Strategy> template class

Source/core/editing/Position.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 452 matching lines @@
 }
 
 template <typename Strategy>
 static ContainerNode* nonShadowBoundaryParentNode(Node* node)
 {
     ContainerNode* parent = Strategy::parent(*node);
     return parent && !parent->isShadowRoot() ? parent : nullptr;
 }
 
 template <typename Strategy>
-Node* PositionAlgorithm<Strategy>::parentEditingBoundary() const
+static Node* parentEditingBoundaryAlgorithm(const PositionAlgorithm<Strategy>& position)
 {
-    if (!m_anchorNode)
-        return 0;
+    Node* const anchorNode = position.anchorNode();
+    if (!anchorNode)
+        return nullptr;
 
-    Node* documentElement = m_anchorNode->document().documentElement();
+    Node* documentElement = anchorNode->document().documentElement();
     if (!documentElement)
-        return 0;
+        return nullptr;
 
-    Node* boundary = computeContainerNode();
-    while (boundary != documentElement && nonShadowBoundaryParentNode<Strategy>(boundary) && m_anchorNode->hasEditableStyle() == Strategy::parent(*boundary)->hasEditableStyle())
+    Node* boundary = position.computeContainerNode();
+    while (boundary != documentElement && nonShadowBoundaryParentNode<Strategy>(boundary) && anchorNode->hasEditableStyle() == Strategy::parent(*boundary)->hasEditableStyle())
         boundary = nonShadowBoundaryParentNode<Strategy>(boundary);
 
     return boundary;
 }
 
+Node* parentEditingBoundary(const Position& position)
+{
+    return parentEditingBoundaryAlgorithm<EditingStrategy>(position);
+}
+
+Node* parentEditingBoundary(const PositionInComposedTree& position)
+{
+    return parentEditingBoundaryAlgorithm<EditingInComposedTreeStrategy>(position);
+}
 
 template <typename Strategy>
 bool PositionAlgorithm<Strategy>::atStartOfTree() const
 {
     if (isNull())
         return true;
     return !Strategy::parent(*anchorNode()) && m_offset == 0;
 }
 
 template <typename Strategy>
@@ skipping 850 matching lines @@
 
 void showTree(const blink::Position* pos)
 {
     if (pos)
         pos->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil)\n");
 }
 
 #endif