handlers_base.hh

// handlers_base.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2007, 2008 The Vaucanson Group.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//

#ifndef VCSN_XML_HANDLERS_BASE_HH
# define VCSN_XML_HANDLERS_BASE_HH

# include <map>
# include <string>

# include <xercesc/sax2/SAX2XMLReader.hpp>
# include <xercesc/sax2/XMLReaderFactory.hpp>
# include <xercesc/sax2/DefaultHandler.hpp>
# include <xercesc/sax2/Attributes.hpp>

# include <xercesc/sax/SAXException.hpp>
# include <xercesc/util/XMLString.hpp>

# include <vaucanson/xml/xmleq.hh>
# include <vaucanson/xml/strings.hh>

namespace vcsn
{
  namespace xml
  {
    /*
     * ErrHandler class, error handler.
     */
    class ErrHandler : public xercesc::DefaultHandler
    {
      public:
        ErrHandler () : DefaultHandler() {}

        void
        warning (const xercesc::SAXParseException& exc);
        // Receive notification of a warning.
        void
        error (const xercesc::SAXParseException& exc);
        // Receive notification of a recoverable error.
        void
        fatalError (const xercesc::SAXParseException& exc);
        // Receive notification of a non-recoverable error.
        void
        resetErrors () {}
        // Reset the Error handler object on its reuse.
    };

    namespace error
    {
      void token(const XMLCh* const localname);
      void attrs(const XMLCh* const localname,
                 const std::string& name,
                 const std::string& value);
      void missattrs(const XMLCh* const localname,
                     const std::string& name);
    } // !error
    /*
     * Handler class
     */
    class Handler : public xercesc::DefaultHandler
    {
      public:
        Handler (xercesc::SAX2XMLReader* parser,
                 Handler& root);
        Handler (xercesc::SAX2XMLReader* parser,
                 xercesc::DefaultHandler& root,
                 XMLEq& eq);

        void
        startElement (const XMLCh* const uri,
                      const XMLCh* const localname,
                      const XMLCh* const qname,
                      const xercesc::Attributes& attrs);
        void
        endElement (const XMLCh* const uri,
                    const XMLCh* const localname,
                    const XMLCh* const qname);

        virtual void
        start (const XMLCh* const uri,
                      const XMLCh* const localname,
                      const XMLCh* const qname,
                      const xercesc::Attributes& attrs) = 0;
        virtual void
        end (const XMLCh* const uri,
                    const XMLCh* const localname,
                    const XMLCh* const qname) = 0;

        XMLEq& eq() { return eq_; };
# ifdef DEBUG
        static int      indent_;
# endif
      protected:
        // Required to enable a change of the Handler while parsing.
        xercesc::SAX2XMLReader*         parser_;
        xercesc::DefaultHandler&        root_;

        XMLEq&  eq_;
    };
# ifdef DEBUG
    int Handler::indent_ = 0;
# endif

    class UnsupHandler : public Handler
    {
      public:
        UnsupHandler(xercesc::SAX2XMLReader* parser,
                     Handler& root);

        void
        start (const XMLCh* const uri,
                      const XMLCh* const localname,
                      const XMLCh* const qname,
                      const xercesc::Attributes& attrs);
        void
        end (const XMLCh* const uri,
                    const XMLCh* const localname,
                    const XMLCh* const qname);
      private:
        int                             depth_;
    };
  } // !xml
} // !vcsn

# if ! defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
#  include <vaucanson/xml/handlers_base.hxx>
# endif // !VCSN_USE_INTERFACE_ONLY || VCSN_USE_LIB

#endif // !VCSN_XML_HANDLERS_BASE_HH

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