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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 *
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/*
 * Implementation of the DOM nsIDOMRange object.
 */

#ifndef nsRange_h___
#define nsRange_h___

#include "nsIRange.h"
#include "nsIDOMRange.h"
#include "nsIRangeUtils.h"
#include "nsIDOMNSRange.h"
#include "nsCOMPtr.h"
#include "nsIDOMDocumentFragment.h"
#include "nsIContent.h"
#include "nsIDOMNode.h"
#include "prmon.h"
#include "nsStubMutationObserver.h"

// -------------------------------------------------------------------------------

class nsRangeUtils : public nsIRangeUtils
{
public:
  NS_DECL_ISUPPORTS

  // nsIRangeUtils interface
  NS_IMETHOD_(PRInt32) ComparePoints(nsIDOMNode* aParent1, PRInt32 aOffset1,
                                     nsIDOMNode* aParent2, PRInt32 aOffset2);
                               
  NS_IMETHOD CompareNodeToRange(nsIContent* aNode, 
                                nsIDOMRange* aRange,
                                PRBool *outNodeBefore,
                                PRBool *outNodeAfter);
};

// -------------------------------------------------------------------------------

class nsRange : public nsIRange,
                public nsIDOMNSRange,
                public nsStubMutationObserver
{
public:
  nsRange()
  {
  }
  virtual ~nsRange();

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsRange, nsIRange)

  // nsIDOMRange interface
  NS_DECL_NSIDOMRANGE

  // nsIDOMNSRange interface
  NS_DECL_NSIDOMNSRANGE
  
  // nsIRange interface
  virtual nsINode* GetCommonAncestor() const;
  virtual void Reset();
  virtual nsresult SetStart(nsINode* aParent, PRInt32 aOffset);
  virtual nsresult SetEnd(nsINode* aParent, PRInt32 aOffset);
  virtual nsresult CloneRange(nsIRange** aNewRange) const;
  
  // nsIMutationObserver methods
  virtual void CharacterDataChanged(nsIDocument* aDocument,
                                    nsIContent* aContent,
                                    CharacterDataChangeInfo* aChangeInfo);
  virtual void ContentInserted(nsIDocument* aDocument,
                               nsIContent* aContainer,
                               nsIContent* aChild,
                               PRInt32 aIndexInContainer);
  virtual void ContentRemoved(nsIDocument* aDocument,
                              nsIContent* aContainer,
                              nsIContent* aChild,
                              PRInt32 aIndexInContainer);
  virtual void ParentChainChanged(nsIContent *aContent);

private:
  // no copy's or assigns
  nsRange(const nsRange&);
  nsRange& operator=(const nsRange&);

  nsINode* IsValidBoundary(nsINode* aNode);
 
  /**
   * Cut or delete the range's contents.
   *
   * @param aFragment nsIDOMDocumentFragment containing the nodes.
   *                  May be null to indicate the caller doesn't want a fragment.
   */
  nsresult CutContents(nsIDOMDocumentFragment** frag);

  /**
   * Guts of cloning a range.  Addrefs the new range.
   */
  nsresult DoCloneRange(nsIRange** aNewRange) const;

  static nsresult CloneParentsBetween(nsIDOMNode *aAncestor,
                                      nsIDOMNode *aNode,
                                      nsIDOMNode **aClosestAncestor,
                                      nsIDOMNode **aFarthestAncestor);

public:
/******************************************************************************
 *  Utility routine to detect if a content node starts before a range and/or 
 *  ends after a range.  If neither it is contained inside the range.
 *  
 *  XXX - callers responsibility to ensure node in same doc as range!
 *
 *****************************************************************************/
  static nsresult CompareNodeToRange(nsINode* aNode, nsIDOMRange* aRange,
                                     PRBool *outNodeBefore,
                                     PRBool *outNodeAfter);
  static nsresult CompareNodeToRange(nsINode* aNode, nsIRange* aRange,
                                     PRBool *outNodeBefore,
                                     PRBool *outNodeAfter);

protected:
  void DoSetRange(nsINode* aStartN, PRInt32 aStartOffset,
                  nsINode* aEndN, PRInt32 aEndOffset,
                  nsINode* aRoot);
};

// Make a new nsIDOMRange object
nsresult NS_NewRange(nsIDOMRange** aInstancePtrResult);

// Make a new nsIRangeUtils object
nsresult NS_NewRangeUtils(nsIRangeUtils** aInstancePtrResult);

#endif /* nsRange_h___ */
