// $Id$

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh

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
***********************************************************************/

#ifndef moses_PCNTools
#define moses_PCNTools

#include <vector>
#include <map>
#include <string>
#include <utility>
#include <cstdlib>

/** A couple of utilities to read .pcn files. A python-compatible format
 * for encoding confusion networks and word lattices.
 */
namespace PCN
{

struct CNAlt {
  CNAlt()
  {}
  CNAlt(const std::string &word,
        const std::vector<float> &denseFeatures,
        const std::map<std::string, float> &sparseFeatures,
        size_t next)
    :m_word(word)
    ,m_denseFeatures(denseFeatures)
    ,m_sparseFeatures(sparseFeatures)
    ,m_next(next)
  {}

  std::string m_word;
  std::vector<float> m_denseFeatures;
  std::map<std::string, float> m_sparseFeatures;
  size_t m_next;
};

//typedef std::pair<std::pair<std::string, std::vector<float> >, size_t> CNAlt;
typedef std::vector<CNAlt> CNCol;
typedef std::vector<CNCol> CN;

/** Given a string ((('foo',0.1,1),('bar',0.9,2)),...) representation of a
 * word lattice in PCN format, return a CN object representing the lattice
 */
CN parsePCN(const std::string& in);

};

#endif