Templatize PendingSelection class

Source/core/layout/PendingSelection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 32 matching lines @@
     m_hasPendingSelection = true;
 }
 
 void PendingSelection::clear()
 {
     m_hasPendingSelection = false;
     m_selection = VisibleSelection();
     m_shouldShowBlockCursor = false;
 }
 
-bool PendingSelection::isInDocument(const Document& document) const
+template <typename Strategy>
+bool PendingSelection::isInDocumentAlgorithm(const Document& document) const
 {
-    Position start = m_selection.start();
+    using PositionType = typename Strategy::PositionType;
+
+    PositionType start = Strategy::selectionStart(m_selection);
     if (start.isNotNull() && (!start.inDocument() || start.document() != document))
         return false;
-    Position end = m_selection.end();
+    PositionType end = Strategy::selectionEnd(m_selection);
     if (end.isNotNull() && (!end.inDocument() || end.document() != document))
         return false;
-    Position extent = m_selection.extent();
+    PositionType extent = Strategy::selectionExtent(m_selection);
     if (extent.isNotNull() && (!extent.inDocument() || extent.document() != document))
         return false;
     return true;
 }
 
-VisibleSelection PendingSelection::calcVisibleSelection() const
+bool PendingSelection::isInDocument(const Document& document) const
 {
-    Position start = m_selection.start();
-    Position end = m_selection.end();
+    return isInDocumentAlgorithm<VisibleSelection::InDOMTree>(document);
+}
+
+template <typename Strategy>
+VisibleSelection PendingSelection::calcVisibleSelectionAlgorithm() const
+{
+    using PositionType = typename Strategy::PositionType;
+
+    PositionType start = Strategy::selectionStart(m_selection);
+    PositionType end = Strategy::selectionEnd(m_selection);
     SelectionType selectionType = VisibleSelection::selectionType(start, end);
     EAffinity affinity = m_selection.affinity();
 
     bool paintBlockCursor = m_shouldShowBlockCursor && selectionType == SelectionType::CaretSelection && !isLogicalEndOfLine(VisiblePosition(end, affinity));
     VisibleSelection selection;
-    if (enclosingTextFormControl(start)) {
-        Position endPosition = paintBlockCursor ? m_selection.extent().next() : end;
+    if (enclosingTextFormControl(start.containerNode())) {
+        PositionType endPosition = paintBlockCursor ? Strategy::selectionExtent(m_selection).next() : end;
         selection.setWithoutValidation(start, endPosition);
         return selection;
     }
 
     VisiblePosition visibleStart = VisiblePosition(start, selectionType == SelectionType::RangeSelection ? DOWNSTREAM : affinity);
     if (paintBlockCursor) {
         VisiblePosition visibleExtent(end, affinity);
         visibleExtent = visibleExtent.next(CanSkipOverEditingBoundary);
         return VisibleSelection(visibleStart, visibleExtent);
     }
     VisiblePosition visibleEnd(end, selectionType == SelectionType::RangeSelection ? UPSTREAM : affinity);
     return VisibleSelection(visibleStart, visibleEnd);
 }
 
+VisibleSelection PendingSelection::calcVisibleSelection() const
+{
+    return calcVisibleSelectionAlgorithm<VisibleSelection::InDOMTree>();
+}
+
 DEFINE_TRACE(PendingSelection)
 {
     visitor->trace(m_selection);
 }
 
 } // namespace blink