xst_dictionary_translator.h

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// Common Text Transformation Library
// Copyright (C) 1997-2006 by Igor Kholodov. 
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// mailto:cttl@users.sourceforge.net
// http://sourceforge.net/projects/cttl/

// xst_translator.h

#ifndef _XST_DICTIONARY_TRANSLATOR_H_INCLUDED_
#define _XST_DICTIONARY_TRANSLATOR_H_INCLUDED_

namespace cttl_impl {

template< typename SequenceT, typename MapT >
class xst_dictionary_translator
{
public:
    typedef typename SequenceT::value_type value_T;

private:
    SequenceT& m_sequence;

    MapT& m_map;

public:
    xst_dictionary_translator( SequenceT& vector_, MapT& map_ )
        :
    m_sequence( vector_ ),
    m_map( map_ )
    {
    }

    xst_dictionary_translator( xst_dictionary_translator< SequenceT, MapT > const& other_ )
        :
    m_sequence( other_.m_sequence ),
    m_map( other_.m_map )
    {
    }

    void operator=( xst_dictionary_translator< SequenceT, MapT > const& ) const
    {
    }

    template< typename InputValueT >
    int operator() ( InputValueT const& value_ )
    {
        int id = m_sequence.size();
        // is this value already in the dictionary ?
        typename MapT::const_iterator it = m_map.find( value_T( value_ ) );
        if ( it == m_map.end() ) {
            // no, this value is new,
            // generate new identity
            m_map.insert(
                std::make_pair( value_, id )
                );
            m_sequence.push_back( value_T( value_ ) );
            //assert( m_sequence.size() == m_map.size() );

        } else
            // yes, value already exists, return its identity:
            id = it->second;

        trace_deposit( id );
        return id;
    }

private:
    void trace_deposit( int id_ )
    {
        CTTL_TRACE_DEPOSIT_TEXT( "dictionary[" );
        CTTL_TRACE_DEPOSIT_TEXT( id_ );
        CTTL_TRACE_DEPOSIT_TEXT( "]=\"" );
        CTTL_TRACE_DEPOSIT_TEXT( m_sequence[ id_ ] );
        CTTL_TRACE_DEPOSIT_TEXT( "\" " );
    }

}; // class xst_dictionary_translator


}   // namespace cttl_impl


#endif //_XST_DICTIONARY_TRANSLATOR_H_INCLUDED_

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