Introduce SelectionAdjuster to adjust selections between DOM tree version and composed tree version

third_party/WebKit/Source/core/editing/VisibleSelection.h

 /*
  * Copyright (C) 2004 Apple Computer, 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 21 matching lines @@
 #include "core/editing/SelectionType.h"
 #include "core/editing/TextAffinity.h"
 #include "core/editing/TextGranularity.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class LayoutPoint;
+class SelectionAdjuster;
 
 // TODO(yosin) We should use capitalized name instead of |SEL_DEFAULT_AFFINITY|.
 const TextAffinity SEL_DEFAULT_AFFINITY = TextAffinity::Downstream; // NOLINT
 enum SelectionDirection { DirectionForward, DirectionBackward, DirectionRight, DirectionLeft };
 
 // Listener of |VisibleSelection| modification. |didChangeVisibleSelection()|
 // will be invoked when base, extent, start or end is moved to a different
 // position.
 //
 // Objects implementing |VisibleSelectionChangeObserver| interface must outlive
@@ skipping 15 matching lines @@
     VisibleSelectionTemplate();
     VisibleSelectionTemplate(const PositionTemplate<Strategy>&, TextAffinity, bool isDirectional = false);
     VisibleSelectionTemplate(const PositionTemplate<Strategy>& base, const PositionTemplate<Strategy>& extent, TextAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
     explicit VisibleSelectionTemplate(const EphemeralRangeTemplate<Strategy>&, TextAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
 
     explicit VisibleSelectionTemplate(const VisiblePositionTemplate<Strategy>&, bool isDirectional = false);
     VisibleSelectionTemplate(const VisiblePositionTemplate<Strategy>&, const VisiblePositionTemplate<Strategy>&, bool isDirectional = false);
 
     explicit VisibleSelectionTemplate(const PositionWithAffinityTemplate<Strategy>&, bool isDirectional = false);
 
-    static VisibleSelectionTemplate<Strategy> createWithoutValidation(const PositionTemplate<Strategy>& base, const PositionTemplate<Strategy>& extent, const PositionTemplate<Strategy>& start, const PositionTemplate<Strategy>& end, TextAffinity, bool isDirectional);
-
     VisibleSelectionTemplate(const VisibleSelectionTemplate&);
     VisibleSelectionTemplate& operator=(const VisibleSelectionTemplate&);
 
     static VisibleSelectionTemplate selectionFromContentsOfNode(Node*);
 
     SelectionType selectionType() const { return m_selectionType; }
 
     void setAffinity(TextAffinity affinity) { m_affinity = affinity; }
     TextAffinity affinity() const { return m_affinity; }
 
@@ skipping 69 matching lines @@
 #ifndef NDEBUG
     void debugPosition(const char* message) const;
     void formatForDebugger(char* buffer, unsigned length) const;
     void showTreeForThis() const;
 #endif
 
     void setStartRespectingGranularity(TextGranularity, EWordSide = RightWordIfOnBoundary);
     void setEndRespectingGranularity(TextGranularity, EWordSide = RightWordIfOnBoundary);
 
 private:
-    VisibleSelectionTemplate(const PositionTemplate<Strategy>& base, const PositionTemplate<Strategy>& extent, const PositionTemplate<Strategy>& start, const PositionTemplate<Strategy>& end, TextAffinity, bool isDirectional);
+    friend class SelectionAdjuster;
 
     void validate(TextGranularity = CharacterGranularity);
 
     // Support methods for validate()
     void setBaseAndExtentToDeepEquivalents();
     void adjustSelectionToAvoidCrossingShadowBoundaries();
     void adjustSelectionToAvoidCrossingEditingBoundaries();
     void updateSelectionType();
 
     // We need to store these as Positions because VisibleSelection is
@@ skipping 21 matching lines @@
     bool m_baseIsFirst : 1; // True if base is before the extent
     bool m_isDirectional : 1; // Non-directional ignores m_baseIsFirst and selection always extends on shift + arrow key.
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT VisibleSelectionTemplate<EditingStrategy>;
 extern template class CORE_EXTERN_TEMPLATE_EXPORT VisibleSelectionTemplate<EditingInComposedTreeStrategy>;
 
 using VisibleSelection = VisibleSelectionTemplate<EditingStrategy>;
 using VisibleSelectionInComposedTree = VisibleSelectionTemplate<EditingInComposedTreeStrategy>;
 
+// TODO(yosin): We should move |SelectionAdjuster| to its own file.
+class SelectionAdjuster final {
+    STATIC_ONLY(SelectionAdjuster);
+public:
+    static void adjustSelectionInComposedTree(VisibleSelectionInComposedTree*, const VisibleSelection&);
+    static void adjustSelectionInDOMTree(VisibleSelection*, const VisibleSelectionInComposedTree&);
+    static void adjustSelectionToAvoidCrossingShadowBoundaries(VisibleSelection*);
+    static void adjustSelectionToAvoidCrossingShadowBoundaries(VisibleSelectionInComposedTree*);
+};
+
 // TODO(yosin): We should use |operator==()| instead of
 // |equalSelectionsInDOMTree()|.
 bool equalSelectionsInDOMTree(const VisibleSelection&, const VisibleSelection&);
 
 // We don't yet support multi-range selections, so we only ever have one range
 // to return.
 CORE_EXPORT EphemeralRange firstEphemeralRangeOf(const VisibleSelection&);
 
 // TODO(sof): move more firstRangeOf() uses to be over EphemeralRange instead.
 CORE_EXPORT PassRefPtrWillBeRawPtr<Range> firstRangeOf(const VisibleSelection&);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisibleSelection&);
 void showTree(const blink::VisibleSelection*);
 void showTree(const blink::VisibleSelectionInComposedTree&);
 void showTree(const blink::VisibleSelectionInComposedTree*);
 #endif
 
 #endif // VisibleSelection_h