Make RenderedPosition constructor to work on flat tree

third_party/WebKit/Source/core/editing/RenderedPosition.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 #include "core/editing/TextAffinity.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/layout/api/LineLayoutAPIShim.h"
 #include "core/layout/compositing/CompositedSelectionBound.h"
 #include "core/paint/PaintLayer.h"
 
 namespace blink {
 
-static inline LayoutObject* layoutObjectFromPosition(const Position& position)
+template <typename Strategy>
+static inline LayoutObject* layoutObjectFromPosition(const PositionTemplate<Strategy>& position)
 {
     DCHECK(position.isNotNull());
     Node* layoutObjectNode = nullptr;
     switch (position.anchorType()) {
     case PositionAnchorType::OffsetInAnchor:
         layoutObjectNode = position.computeNodeAfterPosition();
         if (!layoutObjectNode || !layoutObjectNode->layoutObject())
             layoutObjectNode = position.anchorNode()->lastChild();
         break;
 
     case PositionAnchorType::BeforeAnchor:
     case PositionAnchorType::AfterAnchor:
         break;
 
     case PositionAnchorType::BeforeChildren:
-        layoutObjectNode = position.anchorNode()->firstChild();
+        layoutObjectNode = Strategy::firstChild(*position.anchorNode());
         break;
     case PositionAnchorType::AfterChildren:
-        layoutObjectNode = position.anchorNode()->lastChild();
+        layoutObjectNode = Strategy::lastChild(*position.anchorNode());
         break;
     }
     if (!layoutObjectNode || !layoutObjectNode->layoutObject())
         layoutObjectNode = position.anchorNode();
     return layoutObjectNode->layoutObject();
 }
 
 RenderedPosition::RenderedPosition(const VisiblePosition& position)
     : RenderedPosition(position.deepEquivalent(), position.affinity())
 {
@@ skipping 16 matching lines @@
     InlineBoxPosition boxPosition = computeInlineBoxPosition(position, affinity);
     m_inlineBox = boxPosition.inlineBox;
     m_offset = boxPosition.offsetInBox;
     if (m_inlineBox)
         m_layoutObject = LineLayoutAPIShim::layoutObjectFrom(m_inlineBox->getLineLayoutItem());
     else
         m_layoutObject = layoutObjectFromPosition(position);
 }
 
 RenderedPosition::RenderedPosition(const PositionInFlatTree& position, TextAffinity affinity)
-    : RenderedPosition(toPositionInDOMTree(position), affinity)
+    : m_layoutObject(nullptr)
+    , m_inlineBox(nullptr)
+    , m_offset(0)
+    , m_prevLeafChild(uncachedInlineBox())
+    , m_nextLeafChild(uncachedInlineBox())
 {
+    if (position.isNull())
+        return;
+    InlineBoxPosition boxPosition = computeInlineBoxPosition(position, affinity);
+    m_inlineBox = boxPosition.inlineBox;
+    m_offset = boxPosition.offsetInBox;
+    if (m_inlineBox)
+        m_layoutObject = LineLayoutAPIShim::layoutObjectFrom(m_inlineBox->getLineLayoutItem());
+    else
+        m_layoutObject = layoutObjectFromPosition(position);
 }
 
 InlineBox* RenderedPosition::prevLeafChild() const
 {
     if (m_prevLeafChild == uncachedInlineBox())
         m_prevLeafChild = m_inlineBox->prevLeafChildIgnoringLineBreak();
     return m_prevLeafChild;
 }
 
 InlineBox* RenderedPosition::nextLeafChild() const
@@ skipping 161 matching lines @@
 bool layoutObjectContainsPosition(LayoutObject* target, const Position& position)
 {
     for (LayoutObject* layoutObject = layoutObjectFromPosition(position); layoutObject && layoutObject->node(); layoutObject = layoutObject->parent()) {
         if (layoutObject == target)
             return true;
     }
     return false;
 }
 
 } // namespace blink