#include <stdio.h>
#include "fields.h"
#include "tokengen.h"

typedef struct {
  IS is;
  int field;
} TrueTokenGen;

TokenGen *new_tokengen(char *fn)
{
  TrueTokenGen *tg;

  tg = (TrueTokenGen *) malloc(sizeof(TrueTokenGen));

  tg->is = new_inputstruct(fn);
  if (tg->is == NULL) return NULL;
  tg->field = -1;
  return (TokenGen *) tg;
}

char *tokengen_get_token(TokenGen *tg)
{
  char *s;
  TrueTokenGen *ttg;

  ttg = (TrueTokenGen *) tg;

  while(ttg->field == -1 || ttg->field >= ttg->is->NF) {
    if (get_line(ttg->is) < 0) return NULL;
    if (ttg->is->text1[0] == '#') {
      ttg->field = -1;
    } else {
      ttg->field = 0;
    }
  }

  s = ttg->is->fields[ttg->field];
  ttg->field++;
  return s;
}