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nsTraversal.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** 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 this file as it was released on May 1 2001.
 *
 * The Initial Developer of the Original Code is
 * Jonas Sicking.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Jonas Sicking <sicking@bigfoot.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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 "nsTraversal.h"

#include "nsIDOMNode.h"
#include "nsIDOMNodeFilter.h"
#include "nsDOMError.h"

#include "nsIContent.h"

#include "nsGkAtoms.h"

nsTraversal::nsTraversal(nsINode *aRoot,
                         PRUint32 aWhatToShow,
                         nsIDOMNodeFilter *aFilter,
                         PRBool aExpandEntityReferences) :
    mRoot(aRoot),
    mWhatToShow(aWhatToShow),
    mFilter(aFilter),
    mExpandEntityReferences(aExpandEntityReferences)
{
    NS_ASSERTION(aRoot, "invalid root in call to nsTraversal constructor");
}

nsTraversal::~nsTraversal()
{
    /* destructor code */
}

/*
 * Tests if and how a node should be filtered. Uses mWhatToShow and
 * mFilter to test the node.
 * @param aNode     Node to test
 * @param _filtered Returned filtervalue. See nsIDOMNodeFilter.idl
 * @returns         Errorcode
 */
nsresult nsTraversal::TestNode(nsINode* aNode, PRInt16* _filtered)
{
    nsresult rv;

    *_filtered = nsIDOMNodeFilter::FILTER_SKIP;

    PRUint16 nodeType = 0;
    // Check the most common cases
    if (aNode->IsNodeOfType(nsINode::eELEMENT)) {
        nodeType = nsIDOMNode::ELEMENT_NODE;
    }
    else if (aNode->IsNodeOfType(nsINode::eCONTENT)) {
        nsIAtom* tag = static_cast<nsIContent*>(aNode)->Tag();
        if (tag == nsGkAtoms::textTagName) {
            nodeType = nsIDOMNode::TEXT_NODE;
        }
        else if (tag == nsGkAtoms::cdataTagName) {
            nodeType = nsIDOMNode::CDATA_SECTION_NODE;
        }
        else if (tag == nsGkAtoms::commentTagName) {
            nodeType = nsIDOMNode::COMMENT_NODE;
        }
        else if (tag == nsGkAtoms::processingInstructionTagName) {
            nodeType = nsIDOMNode::PROCESSING_INSTRUCTION_NODE;
        }
    }

    nsCOMPtr<nsIDOMNode> domNode;
    if (!nodeType) {
        domNode = do_QueryInterface(aNode);
        rv = domNode->GetNodeType(&nodeType);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    if (nodeType <= 12 && !((1 << (nodeType-1)) & mWhatToShow)) {
        return NS_OK;
    }

    if (mFilter) {
        if (!domNode) {
            domNode = do_QueryInterface(aNode);
        }

        return mFilter->AcceptNode(domNode, _filtered);
    }

    *_filtered = nsIDOMNodeFilter::FILTER_ACCEPT;
    return NS_OK;
}

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