Move "line" granularity related functions to VisibleUnitLine.cpp

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

Index: third_party/WebKit/Source/core/editing/VisibleUnits.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
index 3e2484f8e54e686ead2e863588adec4cfa121e51..674ec43e7e6de1391063bda523020869fc8d9982 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
@@ -165,7 +165,8 @@ PositionInFlatTree CanonicalPositionOf(const PositionInFlatTree& position) {
 }
 
 template <typename Strategy>
-static PositionWithAffinityTemplate<Strategy> HonorEditingBoundaryAtOrBefore(
+static PositionWithAffinityTemplate<Strategy>
+HonorEditingBoundaryAtOrBeforeTemplate(
     const PositionWithAffinityTemplate<Strategy>& pos,
     const PositionTemplate<Strategy>& anchor) {
   if (pos.IsNull())
@@ -198,6 +199,18 @@ static PositionWithAffinityTemplate<Strategy> HonorEditingBoundaryAtOrBefore(
                                                   *highest_root);
 }
 
+PositionWithAffinity HonorEditingBoundaryAtOrBefore(
+    const PositionWithAffinity& pos,
+    const Position& anchor) {
+  return HonorEditingBoundaryAtOrBeforeTemplate(pos, anchor);
+}
+
+PositionInFlatTreeWithAffinity HonorEditingBoundaryAtOrBefore(
+    const PositionInFlatTreeWithAffinity& pos,
+    const PositionInFlatTree& anchor) {
+  return HonorEditingBoundaryAtOrBeforeTemplate(pos, anchor);
+}
+
 template <typename Strategy>
 VisiblePositionTemplate<Strategy> HonorEditingBoundaryAtOrBeforeAlgorithm(
     const VisiblePositionTemplate<Strategy>& pos,
@@ -220,7 +233,7 @@ VisiblePositionInFlatTree HonorEditingBoundaryAtOrBefore(
 }
 
 template <typename Strategy>
-static VisiblePositionTemplate<Strategy> HonorEditingBoundaryAtOrAfter(
+static VisiblePositionTemplate<Strategy> HonorEditingBoundaryAtOrAfterTemplate(
     const VisiblePositionTemplate<Strategy>& pos,
     const PositionTemplate<Strategy>& anchor) {
   DCHECK(pos.IsValid()) << pos;
@@ -255,144 +268,15 @@ static VisiblePositionTemplate<Strategy> HonorEditingBoundaryAtOrAfter(
                                                          *highest_root);
 }
 
-static bool HasEditableStyle(const Node& node, EditableType editable_type) {
-  if (editable_type == kHasEditableAXRole) {
-    if (AXObjectCache* cache = node.GetDocument().ExistingAXObjectCache()) {
-      if (cache->RootAXEditableElement(&node))
-        return true;
-    }
-  }
-
-  return HasEditableStyle(node);
-}
-
-static Element* RootEditableElement(const Node& node,
-                                    EditableType editable_type) {
-  if (editable_type == kHasEditableAXRole) {
-    if (AXObjectCache* cache = node.GetDocument().ExistingAXObjectCache())
-      return const_cast<Element*>(cache->RootAXEditableElement(&node));
-  }
-
-  return RootEditableElement(node);
-}
-
-static Element* RootAXEditableElementOf(const Position& position) {
-  Node* node = position.ComputeContainerNode();
-  if (!node)
-    return 0;
-
-  if (IsDisplayInsideTable(node))
-    node = node->parentNode();
-
-  return RootEditableElement(*node, kHasEditableAXRole);
-}
-
-static bool HasAXEditableStyle(const Node& node) {
-  return HasEditableStyle(node, kHasEditableAXRole);
-}
-
-static ContainerNode* HighestEditableRoot(const Position& position,
-                                          EditableType editable_type) {
-  if (editable_type == kHasEditableAXRole)
-    return HighestEditableRoot(position, RootAXEditableElementOf,
-                               HasAXEditableStyle);
-
-  return HighestEditableRoot(position);
-}
-
-static Node* PreviousLeafWithSameEditability(Node* node,
-                                             EditableType editable_type) {
-  bool editable = HasEditableStyle(*node, editable_type);
-  node = PreviousAtomicLeafNode(*node);
-  while (node) {
-    if (editable == HasEditableStyle(*node, editable_type))
-      return node;
-    node = PreviousAtomicLeafNode(*node);
-  }
-  return 0;
-}
-
-static Node* NextLeafWithSameEditability(
-    Node* node,
-    EditableType editable_type = kContentIsEditable) {
-  if (!node)
-    return 0;
-
-  bool editable = HasEditableStyle(*node, editable_type);
-  node = NextAtomicLeafNode(*node);
-  while (node) {
-    if (editable == HasEditableStyle(*node, editable_type))
-      return node;
-    node = NextAtomicLeafNode(*node);
-  }
-  return 0;
-}
-
-// FIXME: consolidate with code in previousLinePosition.
-Position PreviousRootInlineBoxCandidatePosition(
-    Node* node,
-    const VisiblePosition& visible_position,
-    EditableType editable_type) {
-  DCHECK(visible_position.IsValid()) << visible_position;
-  ContainerNode* highest_root =
-      HighestEditableRoot(visible_position.DeepEquivalent(), editable_type);
-  Node* previous_node = PreviousLeafWithSameEditability(node, editable_type);
-
-  while (previous_node &&
-         (!previous_node->GetLayoutObject() ||
-          InSameLine(
-              CreateVisiblePosition(FirstPositionInOrBeforeNode(previous_node)),
-              visible_position)))
-    previous_node =
-        PreviousLeafWithSameEditability(previous_node, editable_type);
-
-  while (previous_node && !previous_node->IsShadowRoot()) {
-    if (HighestEditableRoot(FirstPositionInOrBeforeNode(previous_node),
-                            editable_type) != highest_root)
-      break;
-
-    Position pos = isHTMLBRElement(*previous_node)
-                       ? Position::BeforeNode(previous_node)
-                       : Position::EditingPositionOf(
-                             previous_node, CaretMaxOffset(previous_node));
-
-    if (IsVisuallyEquivalentCandidate(pos))
-      return pos;
-
-    previous_node =
-        PreviousLeafWithSameEditability(previous_node, editable_type);
-  }
-  return Position();
+VisiblePosition HonorEditingBoundaryAtOrAfter(const VisiblePosition& pos,
+                                              const Position& anchor) {
+  return HonorEditingBoundaryAtOrAfterTemplate(pos, anchor);
 }
 
-Position NextRootInlineBoxCandidatePosition(
-    Node* node,
-    const VisiblePosition& visible_position,
-    EditableType editable_type) {
-  DCHECK(visible_position.IsValid()) << visible_position;
-  ContainerNode* highest_root =
-      HighestEditableRoot(visible_position.DeepEquivalent(), editable_type);
-  Node* next_node = NextLeafWithSameEditability(node, editable_type);
-  while (next_node && (!next_node->GetLayoutObject() ||
-                       InSameLine(CreateVisiblePosition(
-                                      FirstPositionInOrBeforeNode(next_node)),
-                                  visible_position)))
-    next_node = NextLeafWithSameEditability(next_node, kContentIsEditable);
-
-  while (next_node && !next_node->IsShadowRoot()) {
-    if (HighestEditableRoot(FirstPositionInOrBeforeNode(next_node),
-                            editable_type) != highest_root)
-      break;
-
-    Position pos;
-    pos = Position::EditingPositionOf(next_node, CaretMinOffset(next_node));
-
-    if (IsVisuallyEquivalentCandidate(pos))
-      return pos;
-
-    next_node = NextLeafWithSameEditability(next_node, editable_type);
-  }
-  return Position();
+VisiblePositionInFlatTree HonorEditingBoundaryAtOrAfter(
+    const VisiblePositionInFlatTree& pos,
+    const PositionInFlatTree& anchor) {
+  return HonorEditingBoundaryAtOrAfterTemplate(pos, anchor);
 }
 
 template <typename Strategy>
@@ -809,509 +693,6 @@ VisiblePosition NextWordPosition(const VisiblePosition& c) {
 
 // ---------
 
-enum LineEndpointComputationMode { kUseLogicalOrdering, kUseInlineBoxOrdering };
-template <typename Strategy>
-static PositionWithAffinityTemplate<Strategy> StartPositionForLine(
-    const PositionWithAffinityTemplate<Strategy>& c,
-    LineEndpointComputationMode mode) {
-  if (c.IsNull())
-    return PositionWithAffinityTemplate<Strategy>();
-
-  RootInlineBox* root_box =
-      RenderedPosition(c.GetPosition(), c.Affinity()).RootBox();
-  if (!root_box) {
-    // There are VisiblePositions at offset 0 in blocks without
-    // RootInlineBoxes, like empty editable blocks and bordered blocks.
-    PositionTemplate<Strategy> p = c.GetPosition();
-    if (p.AnchorNode()->GetLayoutObject() &&
-        p.AnchorNode()->GetLayoutObject()->IsLayoutBlock() &&
-        !p.ComputeEditingOffset())
-      return c;
-
-    return PositionWithAffinityTemplate<Strategy>();
-  }
-
-  Node* start_node;
-  InlineBox* start_box;
-  if (mode == kUseLogicalOrdering) {
-    start_node = root_box->GetLogicalStartBoxWithNode(start_box);
-    if (!start_node)
-      return PositionWithAffinityTemplate<Strategy>();
-  } else {
-    // Generated content (e.g. list markers and CSS :before and :after
-    // pseudoelements) have no corresponding DOM element, and so cannot be
-    // represented by a VisiblePosition. Use whatever follows instead.
-    start_box = root_box->FirstLeafChild();
-    while (true) {
-      if (!start_box)
-        return PositionWithAffinityTemplate<Strategy>();
-
-      start_node = start_box->GetLineLayoutItem().NonPseudoNode();
-      if (start_node)
-        break;
-
-      start_box = start_box->NextLeafChild();
-    }
-  }
-
-  return PositionWithAffinityTemplate<Strategy>(
-      start_node->IsTextNode()
-          ? PositionTemplate<Strategy>(ToText(start_node),
-                                       ToInlineTextBox(start_box)->Start())
-          : PositionTemplate<Strategy>::BeforeNode(start_node));
-}
-
-template <typename Strategy>
-static PositionWithAffinityTemplate<Strategy> StartOfLineAlgorithm(
-    const PositionWithAffinityTemplate<Strategy>& c) {
-  // TODO: this is the current behavior that might need to be fixed.
-  // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail.
-  PositionWithAffinityTemplate<Strategy> vis_pos =
-      StartPositionForLine(c, kUseInlineBoxOrdering);
-  return HonorEditingBoundaryAtOrBefore(vis_pos, c.GetPosition());
-}
-
-static PositionWithAffinity StartOfLine(
-    const PositionWithAffinity& current_position) {
-  return StartOfLineAlgorithm<EditingStrategy>(current_position);
-}
-
-static PositionInFlatTreeWithAffinity StartOfLine(
-    const PositionInFlatTreeWithAffinity& current_position) {
-  return StartOfLineAlgorithm<EditingInFlatTreeStrategy>(current_position);
-}
-
-// FIXME: Rename this function to reflect the fact it ignores bidi levels.
-VisiblePosition StartOfLine(const VisiblePosition& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  return CreateVisiblePosition(
-      StartOfLine(current_position.ToPositionWithAffinity()));
-}
-
-VisiblePositionInFlatTree StartOfLine(
-    const VisiblePositionInFlatTree& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  return CreateVisiblePosition(
-      StartOfLine(current_position.ToPositionWithAffinity()));
-}
-
-template <typename Strategy>
-static PositionWithAffinityTemplate<Strategy> LogicalStartOfLineAlgorithm(
-    const PositionWithAffinityTemplate<Strategy>& c) {
-  // TODO: this is the current behavior that might need to be fixed.
-  // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail.
-  PositionWithAffinityTemplate<Strategy> vis_pos =
-      StartPositionForLine(c, kUseLogicalOrdering);
-
-  if (ContainerNode* editable_root = HighestEditableRoot(c.GetPosition())) {
-    if (!editable_root->contains(vis_pos.GetPosition().ComputeContainerNode()))
-      return PositionWithAffinityTemplate<Strategy>(
-          PositionTemplate<Strategy>::FirstPositionInNode(editable_root));
-  }
-
-  return HonorEditingBoundaryAtOrBefore(vis_pos, c.GetPosition());
-}
-
-VisiblePosition LogicalStartOfLine(const VisiblePosition& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  return CreateVisiblePosition(LogicalStartOfLineAlgorithm<EditingStrategy>(
-      current_position.ToPositionWithAffinity()));
-}
-
-VisiblePositionInFlatTree LogicalStartOfLine(
-    const VisiblePositionInFlatTree& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  return CreateVisiblePosition(
-      LogicalStartOfLineAlgorithm<EditingInFlatTreeStrategy>(
-          current_position.ToPositionWithAffinity()));
-}
-
-template <typename Strategy>
-static VisiblePositionTemplate<Strategy> EndPositionForLine(
-    const VisiblePositionTemplate<Strategy>& c,
-    LineEndpointComputationMode mode) {
-  DCHECK(c.IsValid()) << c;
-  if (c.IsNull())
-    return VisiblePositionTemplate<Strategy>();
-
-  RootInlineBox* root_box = RenderedPosition(c).RootBox();
-  if (!root_box) {
-    // There are VisiblePositions at offset 0 in blocks without
-    // RootInlineBoxes, like empty editable blocks and bordered blocks.
-    const PositionTemplate<Strategy> p = c.DeepEquivalent();
-    if (p.AnchorNode()->GetLayoutObject() &&
-        p.AnchorNode()->GetLayoutObject()->IsLayoutBlock() &&
-        !p.ComputeEditingOffset())
-      return c;
-    return VisiblePositionTemplate<Strategy>();
-  }
-
-  Node* end_node;
-  InlineBox* end_box;
-  if (mode == kUseLogicalOrdering) {
-    end_node = root_box->GetLogicalEndBoxWithNode(end_box);
-    if (!end_node)
-      return VisiblePositionTemplate<Strategy>();
-  } else {
-    // Generated content (e.g. list markers and CSS :before and :after
-    // pseudo elements) have no corresponding DOM element, and so cannot be
-    // represented by a VisiblePosition. Use whatever precedes instead.
-    end_box = root_box->LastLeafChild();
-    while (true) {
-      if (!end_box)
-        return VisiblePositionTemplate<Strategy>();
-
-      end_node = end_box->GetLineLayoutItem().NonPseudoNode();
-      if (end_node)
-        break;
-
-      end_box = end_box->PrevLeafChild();
-    }
-  }
-
-  PositionTemplate<Strategy> pos;
-  if (isHTMLBRElement(*end_node)) {
-    pos = PositionTemplate<Strategy>::BeforeNode(end_node);
-  } else if (end_box->IsInlineTextBox() && end_node->IsTextNode()) {
-    InlineTextBox* end_text_box = ToInlineTextBox(end_box);
-    int end_offset = end_text_box->Start();
-    if (!end_text_box->IsLineBreak())
-      end_offset += end_text_box->Len();
-    pos = PositionTemplate<Strategy>(ToText(end_node), end_offset);
-  } else {
-    pos = PositionTemplate<Strategy>::AfterNode(end_node);
-  }
-
-  return CreateVisiblePosition(pos, VP_UPSTREAM_IF_POSSIBLE);
-}
-
-// TODO(yosin) Rename this function to reflect the fact it ignores bidi levels.
-template <typename Strategy>
-static VisiblePositionTemplate<Strategy> EndOfLineAlgorithm(
-    const VisiblePositionTemplate<Strategy>& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  // TODO(yosin) this is the current behavior that might need to be fixed.
-  // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail.
-  VisiblePositionTemplate<Strategy> vis_pos =
-      EndPositionForLine(current_position, kUseInlineBoxOrdering);
-
-  // Make sure the end of line is at the same line as the given input
-  // position. Else use the previous position to obtain end of line. This
-  // condition happens when the input position is before the space character
-  // at the end of a soft-wrapped non-editable line. In this scenario,
-  // |endPositionForLine()| would incorrectly hand back a position in the next
-  // line instead. This fix is to account for the discrepancy between lines
-  // with "webkit-line-break:after-white-space" style versus lines without
-  // that style, which would break before a space by default.
-  if (!InSameLine(current_position, vis_pos)) {
-    vis_pos = PreviousPositionOf(current_position);
-    if (vis_pos.IsNull())
-      return VisiblePositionTemplate<Strategy>();
-    vis_pos = EndPositionForLine(vis_pos, kUseInlineBoxOrdering);
-  }
-
-  return HonorEditingBoundaryAtOrAfter(vis_pos,
-                                       current_position.DeepEquivalent());
-}
-
-// TODO(yosin) Rename this function to reflect the fact it ignores bidi levels.
-VisiblePosition EndOfLine(const VisiblePosition& current_position) {
-  return EndOfLineAlgorithm<EditingStrategy>(current_position);
-}
-
-VisiblePositionInFlatTree EndOfLine(
-    const VisiblePositionInFlatTree& current_position) {
-  return EndOfLineAlgorithm<EditingInFlatTreeStrategy>(current_position);
-}
-
-template <typename Strategy>
-static bool InSameLogicalLine(const VisiblePositionTemplate<Strategy>& a,
-                              const VisiblePositionTemplate<Strategy>& b) {
-  DCHECK(a.IsValid()) << a;
-  DCHECK(b.IsValid()) << b;
-  return a.IsNotNull() && LogicalStartOfLine(a).DeepEquivalent() ==
-                              LogicalStartOfLine(b).DeepEquivalent();
-}
-
-template <typename Strategy>
-VisiblePositionTemplate<Strategy> LogicalEndOfLineAlgorithm(
-    const VisiblePositionTemplate<Strategy>& current_position) {
-  DCHECK(current_position.IsValid()) << current_position;
-  // TODO(yosin) this is the current behavior that might need to be fixed.
-  // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail.
-  VisiblePositionTemplate<Strategy> vis_pos =
-      EndPositionForLine(current_position, kUseLogicalOrdering);
-
-  // Make sure the end of line is at the same line as the given input
-  // position. For a wrapping line, the logical end position for the
-  // not-last-2-lines might incorrectly hand back the logical beginning of the
-  // next line. For example,
-  // <div contenteditable dir="rtl" style="line-break:before-white-space">xyz
-  // a xyz xyz xyz xyz xyz xyz xyz xyz xyz xyz </div>
-  // In this case, use the previous position of the computed logical end
-  // position.
-  if (!InSameLogicalLine(current_position, vis_pos))
-    vis_pos = PreviousPositionOf(vis_pos);
-
-  if (ContainerNode* editable_root =
-          HighestEditableRoot(current_position.DeepEquivalent())) {
-    if (!editable_root->contains(
-            vis_pos.DeepEquivalent().ComputeContainerNode()))
-      return CreateVisiblePosition(
-          PositionTemplate<Strategy>::LastPositionInNode(editable_root));
-  }
-
-  return HonorEditingBoundaryAtOrAfter(vis_pos,
-                                       current_position.DeepEquivalent());
-}
-
-VisiblePosition LogicalEndOfLine(const VisiblePosition& current_position) {
-  return LogicalEndOfLineAlgorithm<EditingStrategy>(current_position);
-}
-
-VisiblePositionInFlatTree LogicalEndOfLine(
-    const VisiblePositionInFlatTree& current_position) {
-  return LogicalEndOfLineAlgorithm<EditingInFlatTreeStrategy>(current_position);
-}
-
-template <typename Strategy>
-bool InSameLineAlgorithm(
-    const PositionWithAffinityTemplate<Strategy>& position1,
-    const PositionWithAffinityTemplate<Strategy>& position2) {
-  if (position1.IsNull() || position2.IsNull())
-    return false;
-  DCHECK_EQ(position1.GetDocument(), position2.GetDocument());
-  DCHECK(!position1.GetDocument()->NeedsLayoutTreeUpdate());
-
-  PositionWithAffinityTemplate<Strategy> start_of_line1 =
-      StartOfLine(position1);
-  PositionWithAffinityTemplate<Strategy> start_of_line2 =
-      StartOfLine(position2);
-  if (start_of_line1 == start_of_line2)
-    return true;
-  PositionTemplate<Strategy> canonicalized1 =
-      CanonicalPositionOf(start_of_line1.GetPosition());
-  if (canonicalized1 == start_of_line2.GetPosition())
-    return true;
-  return canonicalized1 == CanonicalPositionOf(start_of_line2.GetPosition());
-}
-
-bool InSameLine(const PositionWithAffinity& a, const PositionWithAffinity& b) {
-  return InSameLineAlgorithm<EditingStrategy>(a, b);
-}
-
-bool InSameLine(const PositionInFlatTreeWithAffinity& position1,
-                const PositionInFlatTreeWithAffinity& position2) {
-  return InSameLineAlgorithm<EditingInFlatTreeStrategy>(position1, position2);
-}
-
-bool InSameLine(const VisiblePosition& position1,
-                const VisiblePosition& position2) {
-  DCHECK(position1.IsValid()) << position1;
-  DCHECK(position2.IsValid()) << position2;
-  return InSameLine(position1.ToPositionWithAffinity(),
-                    position2.ToPositionWithAffinity());
-}
-
-bool InSameLine(const VisiblePositionInFlatTree& position1,
-                const VisiblePositionInFlatTree& position2) {
-  DCHECK(position1.IsValid()) << position1;
-  DCHECK(position2.IsValid()) << position2;
-  return InSameLine(position1.ToPositionWithAffinity(),
-                    position2.ToPositionWithAffinity());
-}
-
-template <typename Strategy>
-bool IsStartOfLineAlgorithm(const VisiblePositionTemplate<Strategy>& p) {
-  DCHECK(p.IsValid()) << p;
-  return p.IsNotNull() && p.DeepEquivalent() == StartOfLine(p).DeepEquivalent();
-}
-
-bool IsStartOfLine(const VisiblePosition& p) {
-  return IsStartOfLineAlgorithm<EditingStrategy>(p);
-}
-
-bool IsStartOfLine(const VisiblePositionInFlatTree& p) {
-  return IsStartOfLineAlgorithm<EditingInFlatTreeStrategy>(p);
-}
-
-template <typename Strategy>
-bool IsEndOfLineAlgorithm(const VisiblePositionTemplate<Strategy>& p) {
-  DCHECK(p.IsValid()) << p;
-  return p.IsNotNull() && p.DeepEquivalent() == EndOfLine(p).DeepEquivalent();
-}
-
-bool IsEndOfLine(const VisiblePosition& p) {
-  return IsEndOfLineAlgorithm<EditingStrategy>(p);
-}
-
-bool IsEndOfLine(const VisiblePositionInFlatTree& p) {
-  return IsEndOfLineAlgorithm<EditingInFlatTreeStrategy>(p);
-}
-
-template <typename Strategy>
-static bool IsLogicalEndOfLineAlgorithm(
-    const VisiblePositionTemplate<Strategy>& p) {
-  DCHECK(p.IsValid()) << p;
-  return p.IsNotNull() &&
-         p.DeepEquivalent() == LogicalEndOfLine(p).DeepEquivalent();
-}
-
-bool IsLogicalEndOfLine(const VisiblePosition& p) {
-  return IsLogicalEndOfLineAlgorithm<EditingStrategy>(p);
-}
-
-bool IsLogicalEndOfLine(const VisiblePositionInFlatTree& p) {
-  return IsLogicalEndOfLineAlgorithm<EditingInFlatTreeStrategy>(p);
-}
-
-static inline LayoutPoint AbsoluteLineDirectionPointToLocalPointInBlock(
-    RootInlineBox* root,
-    LayoutUnit line_direction_point) {
-  DCHECK(root);
-  LineLayoutBlockFlow containing_block = root->Block();
-  FloatPoint absolute_block_point =
-      containing_block.LocalToAbsolute(FloatPoint());
-  if (containing_block.HasOverflowClip())
-    absolute_block_point -= FloatSize(containing_block.ScrolledContentOffset());
-
-  if (root->Block().IsHorizontalWritingMode())
-    return LayoutPoint(
-        LayoutUnit(line_direction_point - absolute_block_point.X()),
-        root->BlockDirectionPointInLine());
-
-  return LayoutPoint(
-      root->BlockDirectionPointInLine(),
-      LayoutUnit(line_direction_point - absolute_block_point.Y()));
-}
-
-VisiblePosition PreviousLinePosition(const VisiblePosition& visible_position,
-                                     LayoutUnit line_direction_point,
-                                     EditableType editable_type) {
-  DCHECK(visible_position.IsValid()) << visible_position;
-
-  Position p = visible_position.DeepEquivalent();
-  Node* node = p.AnchorNode();
-
-  if (!node)
-    return VisiblePosition();
-
-  LayoutObject* layout_object = node->GetLayoutObject();
-  if (!layout_object)
-    return VisiblePosition();
-
-  RootInlineBox* root = 0;
-  InlineBox* box = ComputeInlineBoxPosition(visible_position).inline_box;
-  if (box) {
-    root = box->Root().PrevRootBox();
-    // We want to skip zero height boxes.
-    // This could happen in case it is a TrailingFloatsRootInlineBox.
-    if (!root || !root->LogicalHeight() || !root->FirstLeafChild())
-      root = 0;
-  }
-
-  if (!root) {
-    Position position = PreviousRootInlineBoxCandidatePosition(
-        node, visible_position, editable_type);
-    if (position.IsNotNull()) {
-      RenderedPosition rendered_position((CreateVisiblePosition(position)));
-      root = rendered_position.RootBox();
-      if (!root)
-        return CreateVisiblePosition(position);
-    }
-  }
-
-  if (root) {
-    // FIXME: Can be wrong for multi-column layout and with transforms.
-    LayoutPoint point_in_line = AbsoluteLineDirectionPointToLocalPointInBlock(
-        root, line_direction_point);
-    LineLayoutItem line_layout_item =
-        root->ClosestLeafChildForPoint(point_in_line, IsEditablePosition(p))
-            ->GetLineLayoutItem();
-    Node* node = line_layout_item.GetNode();
-    if (node && EditingIgnoresContent(*node))
-      return VisiblePosition::InParentBeforeNode(*node);
-    return CreateVisiblePosition(
-        line_layout_item.PositionForPoint(point_in_line));
-  }
-
-  // Could not find a previous line. This means we must already be on the first
-  // line. Move to the start of the content in this block, which effectively
-  // moves us to the start of the line we're on.
-  Element* root_element = HasEditableStyle(*node, editable_type)
-                              ? RootEditableElement(*node, editable_type)
-                              : node->GetDocument().documentElement();
-  if (!root_element)
-    return VisiblePosition();
-  return VisiblePosition::FirstPositionInNode(root_element);
-}
-
-VisiblePosition NextLinePosition(const VisiblePosition& visible_position,
-                                 LayoutUnit line_direction_point,
-                                 EditableType editable_type) {
-  DCHECK(visible_position.IsValid()) << visible_position;
-
-  Position p = visible_position.DeepEquivalent();
-  Node* node = p.AnchorNode();
-
-  if (!node)
-    return VisiblePosition();
-
-  LayoutObject* layout_object = node->GetLayoutObject();
-  if (!layout_object)
-    return VisiblePosition();
-
-  RootInlineBox* root = 0;
-  InlineBox* box = ComputeInlineBoxPosition(visible_position).inline_box;
-  if (box) {
-    root = box->Root().NextRootBox();
-    // We want to skip zero height boxes.
-    // This could happen in case it is a TrailingFloatsRootInlineBox.
-    if (!root || !root->LogicalHeight() || !root->FirstLeafChild())
-      root = 0;
-  }
-
-  if (!root) {
-    // FIXME: We need do the same in previousLinePosition.
-    Node* child = NodeTraversal::ChildAt(*node, p.ComputeEditingOffset());
-    node = child ? child : &NodeTraversal::LastWithinOrSelf(*node);
-    Position position = NextRootInlineBoxCandidatePosition(
-        node, visible_position, editable_type);
-    if (position.IsNotNull()) {
-      RenderedPosition rendered_position((CreateVisiblePosition(position)));
-      root = rendered_position.RootBox();
-      if (!root)
-        return CreateVisiblePosition(position);
-    }
-  }
-
-  if (root) {
-    // FIXME: Can be wrong for multi-column layout and with transforms.
-    LayoutPoint point_in_line = AbsoluteLineDirectionPointToLocalPointInBlock(
-        root, line_direction_point);
-    LineLayoutItem line_layout_item =
-        root->ClosestLeafChildForPoint(point_in_line, IsEditablePosition(p))
-            ->GetLineLayoutItem();
-    Node* node = line_layout_item.GetNode();
-    if (node && EditingIgnoresContent(*node))
-      return VisiblePosition::InParentBeforeNode(*node);
-    return CreateVisiblePosition(
-        line_layout_item.PositionForPoint(point_in_line));
-  }
-
-  // Could not find a next line. This means we must already be on the last line.
-  // Move to the end of the content in this block, which effectively moves us
-  // to the end of the line we're on.
-  Element* root_element = HasEditableStyle(*node, editable_type)
-                              ? RootEditableElement(*node, editable_type)
-                              : node->GetDocument().documentElement();
-  if (!root_element)
-    return VisiblePosition();
-  return VisiblePosition::LastPositionInNode(root_element);
-}
-
-// ---------
-
 static unsigned StartSentenceBoundary(const UChar* characters,
                                       unsigned length,
                                       unsigned,