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// $Id$
#include <iostream>
#include <limits>
#include <assert.h>
#include "DistortionOrientation.h"
#include "TypeDef.h"
#include "Hypothesis.h"
/*
* Load the file pointed to by filename; set up the table according to
* the orientation and condition parameters. Direction will be used
* later for computing the score.
*
* default type is Msd, meaning will distinguish between monotone, swap, discontinuous rather than
* just monotone/non monotone.
*/
int DistortionOrientation::GetOrientation(const Hypothesis *curr_hypothesis, int direction, int type)
{
size_t numSourceWords = curr_hypothesis->GetWordsBitmap().GetSize();
const WordsRange &currTargetRange = curr_hypothesis->GetPrevHypo()->GetCurrSourceWordsRange()
, &prevSourceRange = curr_hypothesis->GetCurrSourceWordsRange()
, &currSourceRange = curr_hypothesis->GetCurrTargetWordsRange();
size_t prev_source_start = prevSourceRange.GetStartPos();
size_t prev_source_end = prevSourceRange.GetEndPos();
size_t curr_source_start = currSourceRange.GetStartPos();
size_t curr_source_end = currSourceRange.GetEndPos();
size_t curr_target_start = currTargetRange.GetStartPos();
size_t curr_target_end = currTargetRange.GetEndPos();
if(direction==LexReorderType::Backward)
{
if(curr_target_start==0 || curr_target_end==numSourceWords || prev_source_end==curr_source_start)
{
//the first two conditionals are edge cases which judge first and last phrases as monotonic
return DistortionOrientationType::MONO;
}
else if(type==DistortionOrientationType::Msd) //distinguish between monotone, swap, discontinuous
{
if(prev_source_start==curr_source_end)
return DistortionOrientationType::SWAP;
else
return DistortionOrientationType::DISC;
}
else //only distinguish between Monotone, non monotone
{
return DistortionOrientationType::NON_MONO;
}
}
else //assume direction is forward, do same computation but on PREVIOUS hypothesis
{
return DistortionOrientation::GetOrientation(curr_hypothesis->GetPrevHypo()
,LexReorderType::Forward
,type);
}
}
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