/* -*- Mode: C++; tab-width: 8; 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 "nsIStreamListener.idl"

interface nsIURI;
interface nsIFeedResultListener;
interface nsIInputStream;

/**
 * An nsIFeedProcessor parses feeds, triggering callbacks based on
 * their contents.
 */
[scriptable, uuid(8a0b2908-21b0-45d7-b14d-30df0f92afc7)]
interface nsIFeedProcessor : nsIStreamListener {

  /**
   * The listener that will respond to feed events. 
   */
  attribute nsIFeedResultListener listener;

  // Level is where to listen for the extension, a constant: FEED,
  // ENTRY, BOTH.
  //
  // XXX todo void registerExtensionHandler(in
  // nsIFeedExtensionHandler, in long level);
  
  /**
   * Parse a feed from an nsIInputStream.
   *
   * @param stream The input stream.
   * @param uri The base URI.
   */
  void parseFromStream(in nsIInputStream stream, in nsIURI uri);

  /**
   * Parse a feed from a string.
   *
   * @param str The string to parse.
   * @param uri The base URI.
   */
  void parseFromString(in AString str, in nsIURI uri);		

  /**
   * Parse a feed asynchronously. The caller must then call the
   * nsIFeedProcessor's nsIStreamListener methods to drive the
   * parse. Do not call the other parse methods during an asynchronous
   * parse.
   *
   * @param requestObserver The observer to notify on start/stop. This
   *                        argument can be null.
   * @param uri The base URI.
   */
  void parseAsync(in nsIRequestObserver requestObserver, in nsIURI uri);
};