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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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.org code.
 *
 * The Initial Developer of the Original Code is Robert Sayre.
 *
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

/**
 * Interface for associating a SAX event with a document location.
 *
 * Note that the results returned by the object will be valid only
 * during the scope of each callback method: the application will
 * receive unpredictable results if it attempts to use the locator at
 * any other time, or after parsing completes.
 */
[scriptable, uuid(7a307c6c-6cc9-11da-be43-001422106990)]
interface nsISAXLocator: nsISupports {

  /**
   * Return the column number where the current document event ends.
   *
   * Warning: The return value from the method is intended only as an
   * approximation for the sake of diagnostics; it is not intended to
   * provide sufficient information to edit the character content of
   * the original XML document.  For example, when lines contain
   * combining character sequences, wide characters, surrogate pairs,
   * or bi-directional text, the value may not correspond to the
   * column in a text editor's display.
   *
   * The return value is an approximation of the column number in the
   * document entity or external parsed entity where the markup
   * triggering the event appears.
   *
   * If possible, the SAX driver should provide the line position of
   * the first character after the text associated with the document
   * event.  The first column in each line is column 1.
   *
   * @return The column number, or -1 if none is available.
   */
  readonly attribute long columnNumber;

  /**
   * Return the line number where the current document event ends.
   * Lines are delimited by line ends, which are defined in the XML
   * specification.
   *
   * Warning: The return value from the method is intended only as an
   * approximation for the sake of diagnostics; it is not intended to
   * provide sufficient information to edit the character content of
   * the original XML document.  In some cases, these "line" numbers
   * match what would be displayed as columns, and in others they may
   * not match the source text due to internal entity expansion.
   *
   * The return value is an approximation of the line number in the
   * document entity or external parsed entity where the markup
   * triggering the event appears.
   *
   * If possible, the SAX driver should provide the line position of
   * the first character after the text associated with the document
   * event.  The first line is line 1.
   *
   * @return The line number, or -1 if none is available.
   */
  readonly attribute long lineNumber;

  /**
   * Return the public identifier for the current document event.
   *
   * The return value is the public identifier of the document entity
   * or of the external parsed entity in which the markup triggering
   * the event appears.
   *
   * @return A string containing the public identifier, or
   *         null if none is available.
   */
  readonly attribute AString publicId;

  /**
   * Return the system identifier for the current document event.
   *
   * The return value is the system identifier of the document entity
   * or of the external parsed entity in which the markup triggering
   * the event appears.
   *
   * @return A string containing the system identifier, or null
   *         if none is available.
   */
  readonly attribute AString systemId;
};