Reader.h

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#ifndef ZYPP_PARSER_XML_READER_H
#define ZYPP_PARSER_XML_READER_H

#include <iosfwd>

#include "zypp/base/NonCopyable.h"
#include "zypp/base/InputStream.h"
#include "zypp/base/Function.h"

#include "zypp/parser/xml/Node.h"

namespace zypp
{ 

  namespace xml
  { 

    //
    //  CLASS NAME : Validate
    //
    struct Validate
    {
      static Validate none()
      { return Validate(); }
    };

    //
    //  CLASS NAME : Reader
    //
    class Reader : private zypp::base::NonCopyable
    {
    public:
      Reader( const InputStream & stream_r,
              const Validate & validate_r = Validate::none() );

      ~Reader();

    public:
      bool nextNode();

      bool nextNodeAttribute();

      bool nextNodeOrAttribute()
      { return( nextNodeAttribute() || nextNode() ); }

      bool atEnd() const
      { return( _node.readState() == XML_TEXTREADER_MODE_CLOSED ); }

      const Node & operator*() const
      { return _node; }

      const Node *const operator->() const
      { return &_node; }

    public:
      typedef function<bool( Reader & )> ProcessNode;

      bool foreachNode( ProcessNode fnc_r )
      {
        if ( _node.isAttribute() )
          nextNode();
        for ( ; ! atEnd(); nextNode() )
          {
            if ( ! fnc_r( *this ) )
              return false;
          }
        return true;
      }

      bool foreachNodeAttribute( ProcessNode fnc_r )
      {
        if ( _node.isAttribute() && ! fnc_r( *this ) )
          return false;
        while( nextNodeAttribute() )
          {
            if ( ! fnc_r( *this ) )
              return false;
          }
        return true;
      }

      bool foreachNodeOrAttribute( ProcessNode fnc_r )
      {
        for ( ; ! atEnd(); nextNodeOrAttribute() )
          {
            if ( ! fnc_r( *this ) )
              return false;
          }
        return true;
      }

    public:
      bool seekToNode( int depth_r, const std::string & name_r );

      bool seekToEndNode( int depth_r, const std::string & name_r );

    private:
      void close();

    private:
      InputStream      _stream;
      xmlTextReaderPtr _reader;
      Node             _node;
    };

  } // namespace xml
} // namespace zypp
#endif // ZYPP_PARSER_XML_READER_H

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