/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (the "GPL"), in which case the
 * provisions of the GPL are applicable instead of those above.
 * If you wish to allow use of your version of this file only
 * under the terms of the GPL and not to allow others to use your
 * version of this file under the NPL, indicate your decision by
 * deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL.  If you do not delete
 * the provisions above, a recipient may use your version of this
 * file under either the NPL or the GPL.
 */

/* A class for range utilities. */

#ifndef nsIRangeUtils_h___
#define nsIRangeUtils_h___

#include "nsISupports.h"

// Forward declarations
class nsIDOMRange;
class nsIDOMNode;
class nsIContent;

// IID for the nsIRangeUtils interface
#define NS_IRANGEUTILS_IID       \
{ 0xa6cf9127, 0x15b3, 0x11d2, {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }

class nsIRangeUtils : public nsISupports {
public:
  static const nsIID& GetIID() { static nsIID iid = NS_IRANGEUTILS_IID; return iid; }

  NS_IMETHOD_(PRInt32) ComparePoints(nsIDOMNode* aParent1, PRInt32 aOffset1,
                                     nsIDOMNode* aParent2, PRInt32 aOffset2) = 0;
                               
  NS_IMETHOD_(PRBool) IsNodeIntersectsRange(nsIContent* aNode, nsIDOMRange* aRange) = 0;
  
  NS_IMETHOD CompareNodeToRange(nsIContent* aNode, 
                                nsIDOMRange* aRange,
                                PRBool *outNodeBefore,
                                PRBool *outNodeAfter) = 0;
};

#endif /* nsIRangeUtils_h___ */