/* -*- 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/. */
 
/*
 * Implementation of DOM Traversal's nsIDOMTreeWalker
 */

#ifndef nsTraversal_h___
#define nsTraversal_h___

#include "nsCOMPtr.h"
#include "nsIDocument.h" // for NodeFilterHolder
#include "mozilla/dom/CallbackObject.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/dom/NodeFilterBinding.h"
#include "nsIDOMNodeFilter.h"

class nsINode;

class nsTraversal
{
public:
    nsTraversal(nsINode *aRoot,
                uint32_t aWhatToShow,
                mozilla::dom::NodeFilterHolder aFilter);
    virtual ~nsTraversal();

protected:
    nsCOMPtr<nsINode> mRoot;
    uint32_t mWhatToShow;
    mozilla::dom::NodeFilterHolder mFilter;
    bool mInAcceptNode;

    /*
     * Tests if and how a node should be filtered. Uses mWhatToShow and
     * mFilter to test the node.
     * @param aNode     Node to test
     * @param aResult   Whether we succeeded
     * @returns         Filtervalue. See nsIDOMNodeFilter.idl
     */
    int16_t TestNode(nsINode* aNode, mozilla::ErrorResult& aResult);
};

#endif