/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#ifndef _SAX_FASTPARSER_HXX_
#define _SAX_FASTPARSER_HXX_

#include <vector>
#include <stack>
#include <hash_map>
#include <boost/shared_ptr.hpp>
#include <rtl/ref.hxx>
#include <com/sun/star/xml/sax/XFastParser.hpp>
#include <com/sun/star/xml/sax/XFastTokenHandler.hpp>
#include <com/sun/star/xml/sax/XFastDocumentHandler.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <cppuhelper/implbase2.hxx>

#include <expat.h>
#include "xml2utf.hxx"

#include <sax/fastattribs.hxx>

#define PARSER_IMPLEMENTATION_NAME "com.sun.star.comp.extensions.xml.sax.FastParser"
#define PARSER_SERVICE_NAME        "com.sun.star.xml.sax.FastParser"

namespace sax_fastparser {

class FastLocatorImpl;
struct NamespaceDefine;
struct SaxContextImpl;

typedef ::boost::shared_ptr< SaxContextImpl > SaxContextImplPtr;
typedef ::boost::shared_ptr< NamespaceDefine > NamespaceDefineRef;

typedef ::std::hash_map< ::rtl::OUString, sal_Int32,
        ::rtl::OUStringHash, ::std::equal_to< ::rtl::OUString > > NamespaceMap;

// --------------------------------------------------------------------

struct ParserData
{
    ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XFastDocumentHandler > mxDocumentHandler;
    ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XFastTokenHandler >    mxTokenHandler;
    ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XErrorHandler >        mxErrorHandler;
    ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XEntityResolver >      mxEntityResolver;
    ::com::sun::star::lang::Locale          maLocale;

    ParserData();
    ~ParserData();
};

// --------------------------------------------------------------------

// Entity binds all information needed for a single file
struct Entity : public ParserData
{
    ::com::sun::star::xml::sax::InputSource maStructSource;
    XML_Parser                              mpParser;
    ::sax_expatwrap::XMLFile2UTFConverter   maConverter;
    ::rtl::Reference< FastAttributeList >   mxAttributes;

    // Exceptions cannot be thrown through the C-XmlParser (possible resource leaks),
    // therefore the exception must be saved somewhere.
    ::com::sun::star::uno::Any              maSavedException;

    ::std::stack< SaxContextImplPtr >       maContextStack;
    ::std::vector< NamespaceDefineRef >     maNamespaceDefines;
    
    explicit Entity( const ParserData& rData );
    ~Entity();
};

// --------------------------------------------------------------------

// This class implements the external Parser interface
class FastSaxParser : public ::cppu::WeakImplHelper2< ::com::sun::star::xml::sax::XFastParser, ::com::sun::star::lang::XServiceInfo >
{
public:
    FastSaxParser();
    virtual ~FastSaxParser();

    // The implementation details
    static ::com::sun::star::uno::Sequence< ::rtl::OUString > getSupportedServiceNames_Static(void);

    // XFastParser
    virtual void SAL_CALL parseStream( const ::com::sun::star::xml::sax::InputSource& aInputSource ) throw (::com::sun::star::xml::sax::SAXException, ::com::sun::star::io::IOException, ::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL setFastDocumentHandler( const ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XFastDocumentHandler >& Handler ) throw (::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL setTokenHandler( const ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XFastTokenHandler >& Handler ) throw (::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL registerNamespace( const ::rtl::OUString& NamespaceURL, sal_Int32 NamespaceToken ) throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL setErrorHandler( const ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XErrorHandler >& Handler ) throw (::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL setEntityResolver( const ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XEntityResolver >& Resolver ) throw (::com::sun::star::uno::RuntimeException);
    virtual void SAL_CALL setLocale( const ::com::sun::star::lang::Locale& rLocale ) throw (::com::sun::star::uno::RuntimeException);

    // XServiceInfo
    virtual ::rtl::OUString SAL_CALL getImplementationName(  ) throw (::com::sun::star::uno::RuntimeException);
    virtual sal_Bool SAL_CALL supportsService( const ::rtl::OUString& ServiceName ) throw (::com::sun::star::uno::RuntimeException);
    virtual ::com::sun::star::uno::Sequence< ::rtl::OUString > SAL_CALL getSupportedServiceNames(  ) throw (::com::sun::star::uno::RuntimeException);

    // called by the C callbacks of the expat parser
    void callbackStartElement( const XML_Char* name, const XML_Char** atts );
    void callbackEndElement( const XML_Char* name );
    void callbackCharacters( const XML_Char* s, int nLen );
    int callbackExternalEntityRef( XML_Parser parser, const XML_Char *openEntityNames, const XML_Char *base, const XML_Char *systemId, const XML_Char *publicId);

    inline void pushEntity( const Entity& rEntity ) { maEntities.push( rEntity ); }
    inline void popEntity()                         { maEntities.pop(); }
    Entity& getEntity()                             { return maEntities.top(); }

private:
    void parse();

    sal_Int32 GetToken( const ::rtl::OString& rToken );
    sal_Int32 GetToken( const sal_Char* pToken, sal_Int32 nTokenLen = 0 );
    sal_Int32 GetTokenWithPrefix( const ::rtl::OString& rPrefix, const ::rtl::OString& rName ) throw (::com::sun::star::xml::sax::SAXException);
    sal_Int32 GetTokenWithPrefix( const sal_Char*pPrefix, int nPrefixLen, const sal_Char* pName, int nNameLen ) throw (::com::sun::star::xml::sax::SAXException);
    ::rtl::OUString GetNamespaceURL( const ::rtl::OString& rPrefix ) throw (::com::sun::star::xml::sax::SAXException);
    ::rtl::OUString GetNamespaceURL( const sal_Char*pPrefix, int nPrefixLen ) throw (::com::sun::star::xml::sax::SAXException);
    sal_Int32 GetNamespaceToken( const ::rtl::OUString& rNamespaceURL );
    sal_Int32 GetTokenWithNamespaceURL( const ::rtl::OUString& rNamespaceURL, const sal_Char* pName, int nNameLen );
    void DefineNamespace( const ::rtl::OString& rPrefix, const sal_Char* pNamespaceURL );
    sal_Int32 CreateCustomToken( const sal_Char* pToken, int len = 0 );

    void pushContext();
    void popContext();

    void splitName( const XML_Char *pwName, const XML_Char *&rpPrefix, sal_Int32 &rPrefixLen, const XML_Char *&rpName, sal_Int32 &rNameLen );

private:
    ::osl::Mutex maMutex;

    ::rtl::Reference< FastLocatorImpl >     mxDocumentLocator;
    NamespaceMap                            maNamespaceMap;

    ParserData maData;                      /// Cached parser configuration for next call of parseStream().
    ::std::stack< Entity > maEntities;      /// Entity stack for each call of parseStream().
};

}

#endif // _SAX_FASTPARSER_HXX_