--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/editing/VisibleSelection.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,151 @@
+/*
+ * 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef VisibleSelection_h
+#define VisibleSelection_h
+
+#include "TextGranularity.h"
+#include "VisiblePosition.h"
+
+namespace WebCore {
+
+class Position;
+
+const EAffinity SEL_DEFAULT_AFFINITY = DOWNSTREAM;
+
+class VisibleSelection {
+public:
+    enum SelectionType { NoSelection, CaretSelection, RangeSelection };
+
+    VisibleSelection();
+
+    VisibleSelection(const Position&, EAffinity);
+    VisibleSelection(const Position&, const Position&, EAffinity = SEL_DEFAULT_AFFINITY);
+
+    VisibleSelection(const Range*, EAffinity = SEL_DEFAULT_AFFINITY);
+    
+    VisibleSelection(const VisiblePosition&);
+    VisibleSelection(const VisiblePosition&, const VisiblePosition&);
+
+    static VisibleSelection selectionFromContentsOfNode(Node*);
+
+    SelectionType selectionType() const { return m_selectionType; }
+
+    void setAffinity(EAffinity affinity) { m_affinity = affinity; }
+    EAffinity affinity() const { return m_affinity; }
+
+    void setBase(const Position&);
+    void setBase(const VisiblePosition&);
+    void setExtent(const Position&);
+    void setExtent(const VisiblePosition&);
+    
+    Position base() const { return m_base; }
+    Position extent() const { return m_extent; }
+    Position start() const { return m_start; }
+    Position end() const { return m_end; }
+    
+    VisiblePosition visibleStart() const { return VisiblePosition(m_start, isRange() ? DOWNSTREAM : affinity()); }
+    VisiblePosition visibleEnd() const { return VisiblePosition(m_end, isRange() ? UPSTREAM : affinity()); }
+
+    bool isNone() const { return selectionType() == NoSelection; }
+    bool isCaret() const { return selectionType() == CaretSelection; }
+    bool isRange() const { return selectionType() == RangeSelection; }
+    bool isCaretOrRange() const { return selectionType() != NoSelection; }
+
+    bool isBaseFirst() const { return m_baseIsFirst; }
+
+    bool isAll(StayInEditableContent) const;
+
+    void appendTrailingWhitespace();
+
+    bool expandUsingGranularity(TextGranularity granularity);
+    
+    // We don't yet support multi-range selections, so we only ever have one range to return.
+    PassRefPtr<Range> firstRange() const;
+
+    // FIXME: Most callers probably don't want this function, but are using it
+    // for historical reasons.  toNormalizedRange contracts the range around
+    // text, and moves the caret upstream before returning the range.
+    PassRefPtr<Range> toNormalizedRange() const;
+    
+    Element* rootEditableElement() const;
+    bool isContentEditable() const;
+    bool isContentRichlyEditable() const;
+    Node* shadowTreeRootNode() const;
+    
+    void debugPosition() const;
+
+#ifndef NDEBUG
+    void formatForDebugger(char* buffer, unsigned length) const;
+    void showTreeForThis() const;
+#endif
+
+    void setWithoutValidation(const Position&, const Position&);
+
+private:
+    void validate(TextGranularity = CharacterGranularity);
+
+    // Support methods for validate()
+    void setBaseAndExtentToDeepEquivalents();
+    void setStartAndEndFromBaseAndExtentRespectingGranularity(TextGranularity);
+    void adjustSelectionToAvoidCrossingEditingBoundaries();
+    void updateSelectionType();
+
+    // We need to store these as Positions because VisibleSelection is
+    // used to store values in editing commands for use when
+    // undoing the command. We need to be able to create a selection that, while currently
+    // invalid, will be valid once the changes are undone.
+    
+    Position m_base;   // Where the first click happened
+    Position m_extent; // Where the end click happened
+    Position m_start;  // Leftmost position when expanded to respect granularity
+    Position m_end;    // Rightmost position when expanded to respect granularity
+
+    EAffinity m_affinity;           // the upstream/downstream affinity of the caret
+
+    // these are cached, can be recalculated by validate()
+    SelectionType m_selectionType;    // None, Caret, Range
+    bool m_baseIsFirst;               // true if base is before the extent
+};
+
+inline bool operator==(const VisibleSelection& a, const VisibleSelection& b)
+{
+    return a.start() == b.start() && a.end() == b.end() && a.affinity() == b.affinity() && a.isBaseFirst() == b.isBaseFirst();
+}
+
+inline bool operator!=(const VisibleSelection& a, const VisibleSelection& b)
+{
+    return !(a == b);
+}
+
+} // namespace WebCore
+
+#ifndef NDEBUG
+// Outside the WebCore namespace for ease of invocation from gdb.
+void showTree(const WebCore::VisibleSelection&);
+void showTree(const WebCore::VisibleSelection*);
+#endif
+
+#endif // VisibleSelection_h