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 /*************************************************************************/
 /*                                                                       */
 /*                 Author: Richard Caley (rjc@cstr.ed.ac.uk)             */
 /* --------------------------------------------------------------------  */
 /* Auxiliary functions related to items.                                 */
 /*                                                                       */
 /*************************************************************************/

#include "ling_class/EST_item_aux.h"
#include "ling_class/EST_Item.h"
#include "EST_String.h"
#include "EST_error.h"

#include "../base_class/EST_get_function_template.h"

defineGetFunction(EST_Item, f, EST_Val, getVal)
defineGetFunction(EST_Item, f, EST_String, getString)
defineGetFunction(EST_Item, f, float, getFloat)
defineGetFunction(EST_Item, f, int, getInteger) 

float start(const EST_Item &item)
{
    float v=0;
    EST_feat_status status=efs_ok;
    EST_Item * pp;

    v = getFloat(item, "start", -1.0, status);

    if (v<0.0)
      {
	if ((pp = item.prev()) != NULL)
	  v = getFloat(*pp, "end", -1.0, status);
      }

    return v;
}

float mid(const EST_Item &item)
{
    float v = 0;
    EST_feat_status status=efs_ok;

    v = getFloat(item, "mid", -1.0, status);

    if (v<0.0)
      v = (start(item)+end(item))/2.0;

    return v;
}

float time(const EST_Item &item)
{

  float v = 0;
  EST_feat_status status=efs_ok;

  v = getFloat(item, "time", -1.0, status);
  
  if (v<0.0)
    v = mid(item);
  
  return v;
}

float end(const EST_Item &item)
{
  float v=0;
  EST_feat_status status=efs_ok;
  EST_Item * nn;
  
  v = getFloat(item, "end", -1.0, status);
  
  if (v < 0.0)
    {
      if ((nn = item.next()) != NULL)
	v = getFloat(*nn, "start", -1.0, status);
    }
  
  return v;
}