/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"
#include "nsIAccessibleHyperLink.idl"

/**
 * A cross-platform interface that deals with text which contains hyperlinks.
 * Each link is an embedded object representing exactly 1 character within
 * the hypertext.
 *
 * Current implementation assumes every embedded object is a link.
 */

[scriptable, uuid(b33684e2-090c-4e1d-a3d9-f4b46f4237b9)]
interface nsIAccessibleHyperText : nsISupports
{
  /**
   * Return the number of links contained within this hypertext object.
   */
  readonly attribute long linkCount;

  /**
   * Return link accessible at the given index.
   *
   * @param index  [in] 0-based index of the link that is to be retrieved
   *
   * @return       link accessible or null if there is no link at that index
   */
  nsIAccessibleHyperLink getLinkAt(in long index);

  /**
   * Return index of the given link.
   *
   * @param link  [in] link accessible the index is requested for
   *
   * @return      index of the given link or null if there's no link within
   *                hypertext accessible
   */
  long getLinkIndex(in nsIAccessibleHyperLink link);

  /*
   * Return link index at the given offset within hypertext accessible.
   *
   * @param offset  [in] the 0-based character index
   *
   * @return        0-based link's index or -1 if no link is present at that
   *                  offset
   */
  long getLinkIndexAtOffset(in long offset);
};
