#ifndef moses_PhraseLengthFeature_h
#define moses_PhraseLengthFeature_h

#include <stdexcept>
#include <string>
#include <map>

#include "StatelessFeatureFunction.h"
#include "moses/Word.h"
#include "moses/FactorCollection.h"

namespace Moses
{

/** Sets the features for length of source phrase, target phrase, both.
 */
class PhraseLengthFeature : public StatelessFeatureFunction
{
public:
  PhraseLengthFeature(const std::string &line);

  bool IsUseable(const FactorMask &mask) const {
    return true;
  }

  void EvaluateWhenApplied(const Hypothesis& hypo,
                           ScoreComponentCollection* accumulator) const {
  }

  void EvaluateWhenApplied(const ChartHypothesis& hypo,
                           ScoreComponentCollection*) const {
  }

  void EvaluateWithSourceContext(const InputType &input
                                 , const InputPath &inputPath
                                 , const TargetPhrase &targetPhrase
                                 , const StackVec *stackVec
                                 , ScoreComponentCollection &scoreBreakdown
                                 , ScoreComponentCollection *estimatedScores = NULL) const {
  }

  void EvaluateTranslationOptionListWithSourceContext(const InputType &input
      , const TranslationOptionList &translationOptionList) const {
  }
  virtual void EvaluateInIsolation(const Phrase &source
                                   , const TargetPhrase &targetPhrase
                                   , ScoreComponentCollection &scoreBreakdown
                                   , ScoreComponentCollection &estimatedScores) const;

};

}

#endif // moses_PhraseLengthFeature_h