/* -*- Mode: IDL; 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Peter Van der Beken <peterv@netscape.com> (original author)
 *
 *
 * 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 ***** */

#ifndef TRANSFRMX_TXMOZILLAXSLTPROCESSOR_H
#define TRANSFRMX_TXMOZILLAXSLTPROCESSOR_H

#include "ExprResult.h"
#include "nsIDocumentTransformer.h"
#include "nsIVariant.h"
#include "nsIXSLTProcessor.h"
#include "nsVoidArray.h"
#include "nsWeakPtr.h"
#include "txExpandedNameMap.h"
#include "txXMLEventHandler.h"
#include "nsIXSLTProcessorObsolete.h"
#include "txXSLTProcessor.h"
#include "nsVoidArray.h"
#include "nsAutoPtr.h"
#include "nsIDocumentObserver.h"

class nsIURI;
class nsIXMLContentSink;
class nsIDOMNode;

/* bacd8ad0-552f-11d3-a9f7-000064657374 */
#define TRANSFORMIIX_XSLT_PROCESSOR_CID   \
{ 0xbacd8ad0, 0x552f, 0x11d3, {0xa9, 0xf7, 0x00, 0x00, 0x64, 0x65, 0x73, 0x74} }

#define TRANSFORMIIX_XSLT_PROCESSOR_CONTRACTID \
"@mozilla.org/document-transformer;1?type=xslt"

#define XSLT_MSGS_URL  "chrome://communicator/locale/layout/xslt.properties"

class txVariable : public txIGlobalParameter
{
public:
    txVariable(nsIVariant *aValue) : mValue(aValue),
                                     mTxValue(nsnull)
    {
    }
    nsresult getValue(txAExprResult** aValue)
    {
        NS_ASSERTION(mValue, "variablevalue is null");

        if (!mTxValue) {
            nsresult rv = Convert(mValue, getter_AddRefs(mTxValue));
            NS_ENSURE_SUCCESS(rv, rv);
        }

        *aValue = mTxValue;
        NS_ADDREF(*aValue);

        return NS_OK;
    }
    nsresult getValue(nsIVariant** aValue)
    {
        *aValue = mValue;
        NS_ADDREF(*aValue);
        return NS_OK;
    }
    void setValue(nsIVariant* aValue)
    {
        NS_ASSERTION(aValue, "setting variablevalue to null");
        mValue = aValue;
        mTxValue = nsnull;
    }

private:
    static nsresult Convert(nsIVariant *aValue, txAExprResult** aResult);

    nsCOMPtr<nsIVariant> mValue;
    nsRefPtr<txAExprResult> mTxValue;
};

/**
 * txMozillaXSLTProcessor is a front-end to the XSLT Processor.
 */
class txMozillaXSLTProcessor : public nsIXSLTProcessor,
                               public nsIXSLTProcessorObsolete,
                               public nsIDocumentTransformer,
                               public nsIDocumentObserver
{
public:
    /**
     * Creates a new txMozillaXSLTProcessor
     */
    txMozillaXSLTProcessor();

    /**
     * Default destructor for txMozillaXSLTProcessor
     */
    virtual ~txMozillaXSLTProcessor();

    // nsISupports interface
    NS_DECL_ISUPPORTS

    // nsIXSLTProcessor interface
    NS_DECL_NSIXSLTPROCESSOR

    // nsIXSLTProcessorObsolete interface
    NS_DECL_NSIXSLTPROCESSOROBSOLETE

    // nsIDocumentTransformer interface
    NS_IMETHOD SetTransformObserver(nsITransformObserver* aObserver);
    NS_IMETHOD LoadStyleSheet(nsIURI* aUri, nsILoadGroup* aLoadGroup,
                              nsIURI* aReferrerUri);
    NS_IMETHOD SetSourceContentModel(nsIDOMNode* aSource);
    NS_IMETHOD CancelLoads() {return NS_OK;};

    // nsIDocumentObserver interface
    NS_DECL_NSIDOCUMENTOBSERVER

    nsresult setStylesheet(txStylesheet* aStylesheet);
    void reportError(nsresult aResult, const PRUnichar *aErrorText,
                     const PRUnichar *aSourceText);

private:
    nsresult DoTransform();
    void notifyError();
    nsresult ensureStylesheet();

    nsRefPtr<txStylesheet> mStylesheet;
    nsIDocument* mStylesheetDocument; // weak
    nsCOMPtr<nsIContent> mEmbeddedStylesheetRoot;

    nsCOMPtr<nsIDOMNode> mSource;
    nsresult mTransformResult;
    nsresult mCompileResult;
    nsString mErrorText, mSourceText;
    nsCOMPtr<nsITransformObserver> mObserver;
    txExpandedNameMap mVariables;
};

extern nsresult TX_LoadSheet(nsIURI* aUri, txMozillaXSLTProcessor* aProcessor,
                             nsILoadGroup* aLoadGroup, nsIURI* aReferrerUri);

extern nsresult TX_CompileStylesheet(nsIDOMNode* aNode,
                                     txStylesheet** aStylesheet);

#endif
