Move implementation of Range::firstNode and Range::pastLastNode to Position

Source/core/dom/Position.h

 /*
  * Copyright (C) 2004, 2006, 2008 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 87 matching lines @@
     void clear() { m_anchorNode.clear(); m_offset = 0; m_anchorType = PositionIsOffsetInAnchor; m_isLegacyEditingPosition = false; }
 
     // These are always DOM compliant values.  Editing positions like [img, 0] (aka [img, before])
     // will return img->parentNode() and img->nodeIndex() from these functions.
     Node* containerNode() const; // NULL for a before/after position anchored to a node with no parent
     Text* containerText() const;
 
     int computeOffsetInContainerNode() const;  // O(n) for before/after-anchored positions, O(1) for parent-anchored positions
     Position parentAnchoredEquivalent() const; // Convenience method for DOM positions that also fixes up some positions for editing
 
+    // Returns |PositionIsAnchor| type |Position| which is compatible with
+    // |RangeBoundaryPoint| as safe to pass |Range| constructor. Return value
+    // of this function is different from |parentAnchoredEquivalent()| which
+    // returns editing specific position.
+    Position toOffsetInAnchor() const;
+
     // Inline O(1) access for Positions which callers know to be parent-anchored
     int offsetInContainerNode() const
     {
         ASSERT(anchorType() == PositionIsOffsetInAnchor);
         return m_offset;
     }
 
     // New code should not use this function.
     int deprecatedEditingOffset() const
     {
         if (m_isLegacyEditingPosition || (m_anchorType != PositionIsAfterAnchor && m_anchorType != PositionIsAfterChildren))
             return m_offset;
         return offsetForPositionAfterAnchor();
     }
 
     // These are convenience methods which are smart about whether the position is neighbor anchored or parent anchored
     Node* computeNodeBeforePosition() const;
     Node* computeNodeAfterPosition() const;
 
+    // Returns node as |Range::firstNode()|. This position must be a
+    // |PositionIs::OffsetInAhcor| to behave as |Range| boundary point.
+    Node* nodeAsRangeFirstNode() const;
+
+    // Returns a node as past last as same as |Range::pastLastNode()|. This
+    // function is supposed to used in HTML serialization and plain text
+    // iterator. This position must be a |PositionIs::OffsetInAhcor| to
+    // behave as |Range| boundary point.
+    Node* nodeAsRangePastLastNode() const;
+
     Node* anchorNode() const { return m_anchorNode.get(); }
 
     // FIXME: Callers should be moved off of node(), node() is not always the container for this position.
     // For nodes which editingIgnoresContent(node()) returns true, positions like [ignoredNode, 0]
     // will be treated as before ignoredNode (thus node() is really after the position, not containing it).
     Node* deprecatedNode() const { return m_anchorNode.get(); }
 
     Document* document() const { return m_anchorNode ? &m_anchorNode->document() : 0; }
     bool inDocument() const { return m_anchorNode && m_anchorNode->inDocument(); }
     Element* rootEditableElement() const
@@ skipping 179 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Position&);
 void showTree(const blink::Position*);
 #endif
 
 #endif // Position_h