/**
 * @file   voca_load_htkdict.c
 * 
 * <JA>
 * @brief  HTK形式の単語辞書データの読み込み
 *
 * トライフォンモデルを用いる場合，モノフォン表記からトライフォンへの
 * 変換およびモデルの存在チェックはこの辞書読み込み時に行なわれます．
 * </JA>
 * 
 * <EN>
 * @brief  Read word dictionary from a file in HTK format
 *
 * When using triphone model, conversion from monophone expression
 * in dictionary to triphone and the existence check of word-internal
 * triphone will be done here.
 * </EN>
 * 
 * @author Akinobu LEE
 * @date   Fri Feb 18 19:43:06 2005
 *
 * $Revision: 1.12 $
 * 
 */
/*
 * Copyright (c) 1991-2012 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2012 Julius project team, Nagoya Institute of Technology
 * All rights reserved
 */

#include <sent/stddefs.h>
#include <sent/vocabulary.h>
#include <sent/htk_hmm.h>

/* 
 * dictinary format:
 * 
 * 1 words per line.
 * 
 * fields: GrammarEntry [OutputString] phone1 phone2 ....
 * 
 *     GrammarEntry
 *		   (for N-gram)
 *		   word name in N-gram
 *                 (for DFA)
 *                 terminal symbol ID
 *
 *     [OutputString]
 *		   String to output when the word is recognized.
 *
 *     {OutputString}
 *		   String to output when the word is recognized.
 *                 Also specifies that this word is transparent
 * 
 *     phone1 phon2 ....
 *		   sequence of logical HMM name (normally phoneme)
 *                 to express the pronunciation
 */

#define PHONEMELEN_STEP  30	///< Memory allocation step for phoneme sequence
static char buf[MAXLINELEN];	///< Local work area for input text processing
static char bufbak[MAXLINELEN];	///< Local work area for debug message

static char trbuf[3][MAX_HMMNAME_LEN];	///< Local buffer for triphone convertion
static char chbuf[MAX_HMMNAME_LEN];	     ///< Another local buffer for triphone convertion
static char nophone[1];		///< Local buffer to indicate 'no phone'
static int  trp_l;		///< Triphone cycle index
static int  trp;		///< Triphone cycle index
static int  trp_r;		///< Triphone cycle index

/** 
 * Return string of triphone name composed from last 3 call.
 * 
 * @param p [in] next phone string
 * 
 * @return the composed triphone name, or NULL on end.
 */
char *
cycle_triphone(char *p)
{
  int i;
  
  if (p == NULL) {		/* initialize */
    nophone[0]='\0';
    for(i=0;i<3;i++) trbuf[i][0] = '\0';
    trp_l = 0;
    trp   = 1;
    trp_r = 2;
    return NULL;
  }

  strcpy(trbuf[trp_r],p);

  chbuf[0]='\0';
  if (trbuf[trp_l][0] != '\0') {
    strcat(chbuf,trbuf[trp_l]);
    strcat(chbuf,HMM_LC_DLIM);
  }
  if (trbuf[trp][0] == '\0') {
    i = trp_l;
    trp_l = trp;
    trp = trp_r;
    trp_r = i;
    return NULL;
  }
  strcat(chbuf, trbuf[trp]);
  if (trbuf[trp_r][0] != '\0') {
    strcat(chbuf,HMM_RC_DLIM);
    strcat(chbuf,trbuf[trp_r]);
  }
  i = trp_l;
  trp_l = trp;
  trp = trp_r;
  trp_r = i;

  return(chbuf);
}

/** 
 * Flush the triphone buffer and return the last biphone.
 * 
 * @return the composed last bi-phone name.
 */
char *
cycle_triphone_flush()
{
  return(cycle_triphone(nophone));
}

/** 
 * Add a triphone name to the missing error list in WORD_INFO.
 * 
 * @param winfo [i/o] word dictionary to add the error phone to error list
 * @param name [in] phone name to be added
 */
static void
add_to_error(WORD_INFO *winfo, char *name)
{
  char *buf;
  char *match;

  buf = (char *)mymalloc(strlen(name) + 1);
  strcpy(buf, name);
  if (winfo->errph_root == NULL) {
    winfo->errph_root = aptree_make_root_node(buf, &(winfo->mroot));
  } else {
    match = aptree_search_data(buf, winfo->errph_root);
    if (match == NULL || !strmatch(match, buf)) {
      aptree_add_entry(buf, buf, match, &(winfo->errph_root), &(winfo->mroot));
    }
  }
}

/** 
 * Traverse callback function to output a error phone.
 * 
 * @param x [in] error phone string of the node
 */
static void
callback_list_error(void *x)
{
  char *name;
  name = x;
  jlog("Error: voca_load_htkdict: %s\n", name);
}
/** 
 * Output all error phones appeared while readin a word dictionary.
 * 
 * @param winfo [in] word dictionary data
 */
static void
list_error(WORD_INFO *winfo)
{
  jlog("Error: voca_load_htkdict: begin missing phones\n");
  aptree_traverse_and_do(winfo->errph_root, callback_list_error);
  jlog("Error: voca_load_htkdict: end missing phones\n");
}

/** 
 * Parse a word dictionary and set the maximum state length per word.
 * 
 * @param winfo [i/o]
 */
void
voca_set_stats(WORD_INFO *winfo)
{
  int w,p,n;
  int maxwn;
  int maxwlen;
  int states;
  int models;
  int trnum;

  maxwn = 0;
  maxwlen = 0;
  states = 0;
  models = 0;
  trnum = 0;
  for (w=0;w<winfo->num;w++) {
    models += winfo->wlen[w];
    if (maxwlen < winfo->wlen[w]) maxwlen = winfo->wlen[w];
    n = 0;
    for (p=0;p<winfo->wlen[w];p++) {
      n += hmm_logical_state_num(winfo->wseq[w][p]) - 2;
    }
    if (maxwn < n) maxwn = n;
    states += n;
    if (winfo->is_transparent[w]) trnum++;
  }
  winfo->maxwn = maxwn;
  winfo->maxwlen = maxwlen;
  winfo->totalstatenum = states;
  winfo->totalmodelnum = models;
  winfo->totaltransnum = trnum;
}

/** 
 * Start loading a dictionary.  See voca_load_htkdict() for an example
 * of using this function.
 * 
 * @param winfo [i/o] dictionary data where the data will be loaded
 * @param hmminfo [in] phoneme HMM definition 
 * @param ignore_tri_conv [in] if TRUE, skip triphone conversion while loading
 * 
 */
void
voca_load_start(WORD_INFO *winfo, HTK_HMM_INFO *hmminfo, boolean ignore_tri_conv)
{
  winfo->ok_flag = TRUE;
  winfo->linenum = 0;
  if (hmminfo != NULL && hmminfo->is_triphone && (! ignore_tri_conv)) {
    winfo->do_conv = TRUE;
  } else {
    winfo->do_conv = FALSE;
  }
  winfo_init(winfo);
  winfo->num = 0;
}

/** 
 * Load a line from buffer and set parameters to the dictionary.
 * See voca_load_htkdict() for an example of using this function.
 * 
 * @param buf [in] input buffer containing a word entry
 * @param winfo [i/o] word dictionary to append the entry
 * @param hmminfo [in] phoneme HMM definition
 * 
 * @return TRUE when successfully read, or FALSE on encountered end of
 * dictionary.  When an error occurs, this function will set winfo->ok_flag
 * to FALSE.
 * 
 */
boolean
voca_load_line(char *buf, WORD_INFO *winfo, HTK_HMM_INFO *hmminfo)
{
  WORD_ID vnum;

  winfo->linenum++;
  vnum = winfo->num;
  if (vnum >= winfo->maxnum) {
    if (winfo_expand(winfo) == FALSE) return FALSE;
  }
  if (voca_load_htkdict_line(buf, &vnum, winfo->linenum, winfo, hmminfo, winfo->do_conv, &(winfo->ok_flag)) == FALSE) {
    return FALSE;
  }
  winfo->num = vnum;
  return TRUE;
}

/** 
 * End loading dictionary entries.  It calculates some statistics for
 * the read entries, outputs errors if encountered
 * while the last loading, and returns with status whether an error
 * occured while loading.
 * 
 * @param winfo [i/o] word dictionary just read by voca_load_line() calls
 * 
 * @return TRUE when no error has been occured during loading, or FALSE
 * if an error occured.
 * 
 */
boolean
voca_load_end(WORD_INFO *winfo)
{
  voca_set_stats(winfo);
  if (!winfo->ok_flag) {
    if (winfo->errph_root != NULL) list_error(winfo);
  }
  return(winfo->ok_flag);
}


/** 
 * Top function to read word dictionary via file pointer (gzip enabled)
 * 
 * @param fp [in] file pointer
 * @param winfo [out] pointer to word dictionary to store the read data.
 * @param hmminfo [in] HTK %HMM definition data.  if NULL, phonemes are ignored.
 * @param ignore_tri_conv [in] TRUE if triphone conversion is ignored
 * 
 * @return TRUE on success, FALSE on any error word.
 */
boolean
voca_load_htkdict(FILE *fp, WORD_INFO *winfo, HTK_HMM_INFO *hmminfo, boolean ignore_tri_conv)
{
  boolean ret;

  voca_load_start(winfo, hmminfo, ignore_tri_conv);
  while (getl(buf, sizeof(buf), fp) != NULL) {
    if (voca_load_line(buf, winfo, hmminfo) == FALSE) break;
  }
  ret = voca_load_end(winfo);

  return(ret);
}


/** 
 * Top function to read word dictionary via normal file pointer.
 * 
 * @param fp [in] file pointer
 * @param winfo [out] pointer to word dictionary to store the read data.
 * @param hmminfo [in] HTK %HMM definition data.  if NULL, phonemes are ignored.
 * @param ignore_tri_conv [in] TRUE if triphone conversion is ignored
 * 
 * @return TRUE on success, FALSE on any error word.
 */
boolean
voca_load_htkdict_fp(FILE *fp, WORD_INFO *winfo, HTK_HMM_INFO *hmminfo, boolean ignore_tri_conv)
{
  boolean ret;

  voca_load_start(winfo, hmminfo, ignore_tri_conv);
  while(getl_fp(buf, MAXLINELEN, fp) != NULL) {
    if (voca_load_line(buf, winfo, hmminfo) == FALSE) break;
  }
  ret = voca_load_end(winfo);

  return(ret);
}

/** 
 * Append a single entry to the existing word dictionary.
 * 
 * @param entry [in] dictionary entry string to be appended.
 * @param winfo [out] pointer to word dictionary to append the data.
 * @param hmminfo [in] HTK %HMM definition data.  if NULL, phonemes are ignored.
 * @param ignore_tri_conv [in] TRUE if triphone conversion is ignored
 * 
 * @return TRUE on success, FALSE on any error word.
 */
boolean
voca_append_htkdict(char *entry, WORD_INFO *winfo, HTK_HMM_INFO *hmminfo, boolean ignore_tri_conv)
{
  voca_load_line(entry, winfo, hmminfo);
  return(voca_load_end(winfo));
}

/** 
 * Sub function to Add a dictionary entry line to the word dictionary.
 * 
 * @param buf [i/o] buffer to hold the input string, will be modified in this function
 * @param vnum_p [in] current number of words in @a winfo
 * @param linenum [in] current line number of the input
 * @param winfo [out] pointer to word dictionary to append the data.
 * @param hmminfo [in] HTK %HMM definition data.  if NULL, phonemes are ignored.
 * @param do_conv [in] TRUE if performing triphone conversion
 * @param ok_flag [out] will be set to FALSE if an error occured for this input.
 * 
 * @return FALSE if buf == "DICEND", else TRUE will be returned.
 */
boolean
voca_load_htkdict_line(char *buf, WORD_ID *vnum_p, int linenum, WORD_INFO *winfo, HTK_HMM_INFO *hmminfo, boolean do_conv, boolean *ok_flag)
{
  char *ptmp, *lp = NULL, *p;
  static char cbuf[MAX_HMMNAME_LEN];
  HMM_Logical **tmpwseq;
  int len;
  HMM_Logical *tmplg;
  boolean pok;
  int vnum;

  vnum = *vnum_p;

  if (strmatch(buf, "DICEND")) return FALSE;

  /* allocate temporal work area for the first call */
  if (winfo->work == NULL) {
    winfo->work_num = PHONEMELEN_STEP;
    winfo->work = (void *)mybmalloc2(sizeof(HMM_Logical *) * winfo->work_num, &(winfo->mroot));
  }
  tmpwseq = (HMM_Logical **)winfo->work;

  /* backup whole line for debug output */
  strcpy(bufbak, buf);
  
  /* GrammarEntry */
  if ((ptmp = mystrtok_quote(buf, " \t\n")) == NULL) {
    jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum, bufbak);
    winfo->errnum++;
    *ok_flag = FALSE;
    return TRUE;
  }
  winfo->wname[vnum] = strcpy((char *)mybmalloc2(strlen(ptmp)+1, &(winfo->mroot)), ptmp);

  /* just move pointer to next token */
  if ((ptmp = mystrtok_movetonext(NULL, " \t\n")) == NULL) {
    jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum, bufbak);
    winfo->errnum++;
    *ok_flag = FALSE;
    return TRUE;
  }
#ifdef CLASS_NGRAM
  winfo->cprob[vnum] = 0.0;	/* prob = 1.0, logprob = 0.0 */
#endif
  
  if (ptmp[0] == '@') {		/* class N-gram prob */
#ifdef CLASS_NGRAM
    /* word probability within the class (for class N-gram) */
    /* format: classname @classprob wordname [output] phoneseq */
    /* classname equals to wname, and wordname will be omitted */
    /* format: @%f (log scale) */
    /* if "@" not found or "@0", it means class == word */
    if ((ptmp = mystrtok(NULL, " \t\n")) == NULL) {
      jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum, bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
    if (ptmp[1] == '\0') {	/* space between '@' and figures */
      jlog("Error: voca_load_htkdict: line %d: value after '@' missing, maybe wrong space?\n> %s\n", linenum, bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
    winfo->cprob[vnum] = atof(&(ptmp[1]));
    if (winfo->cprob[vnum] != 0.0) winfo->cwnum++;
    /* read next word entry (just skip them) */
    if ((ptmp = mystrtok(NULL, " \t\n")) == NULL) {
      jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum,bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
    /* move to the next word entry */
    if ((ptmp = mystrtok_movetonext(NULL, " \t\n")) == NULL) {
      jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum, bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
#else  /* ~CLASS_NGRAM */
    jlog("Error: voca_load_htkdict: line %d: cannot handle in-class word probability\n> %s\n", linenum, ptmp, bufbak);
    winfo->errnum++;
    *ok_flag = FALSE;
    return TRUE;
#endif /* CLASS_NGRAM */
  }

  /* OutputString */
  switch(ptmp[0]) {
  case '[':			/* not transparent word */
    winfo->is_transparent[vnum] = FALSE;
    ptmp = mystrtok_quotation(NULL, " \t\n", '[', ']', 0);
    break;
  case '{':			/* transparent word */
    winfo->is_transparent[vnum] = TRUE;
    ptmp = mystrtok_quotation(NULL, " \t\n", '{', '}', 0);
    break;
  default:
#if 1
    /* ALLOW no entry for output */
    /* same as wname is used */
    winfo->is_transparent[vnum] = FALSE;
    ptmp = winfo->wname[vnum];
#else
    /* error */
    jlog("Error: voca_load_htkdict: line %d: missing output string??\n> %s\n", linenum, bufbak);
    winfo->errnum++;
    *ok_flag = FALSE;
    return TRUE;
#endif
  }
  if (ptmp == NULL) {
    jlog("Error: voca_load_htkdict: line %d: corrupted data:\n> %s\n", linenum, bufbak);
    winfo->errnum++;
    *ok_flag = FALSE;
    return TRUE;
  }
  winfo->woutput[vnum] = strcpy((char *)mybmalloc2(strlen(ptmp)+1, &(winfo->mroot)), ptmp);
    
  /* phoneme sequence */
  if (hmminfo == NULL) {
    /* don't read */
    winfo->wseq[vnum] = NULL;
    winfo->wlen[vnum] = 0;
  } else {

    /* store converted phone sequence to temporal bufffer */
    len = 0;
      
    if (do_conv) {
      /* convert phoneme to triphone expression (word-internal) */
      cycle_triphone(NULL);
      if ((lp = mystrtok(NULL, " \t\n")) == NULL) {
	jlog("Error: voca_load_htkdict: line %d: word %s has no phoneme:\n> %s\n", linenum, winfo->wname[vnum], bufbak);
	winfo->errnum++;
	*ok_flag = FALSE;
	return TRUE;
      }
      if (strlen(lp) >= MAX_HMMNAME_LEN) {
	jlog("Error: voca_load_htkdict: line %d: too long phone name: %s\n", linenum, lp);
	winfo->errnum++;
	*ok_flag = FALSE;
	return TRUE;
      }
      cycle_triphone(lp);
    }

    pok = TRUE;
    for (;;) {
      if (do_conv) {
/*	if (lp != NULL) jlog(" %d%s",len,lp);*/
	if (lp != NULL) lp = mystrtok(NULL, " \t\n");
	if (lp != NULL) {
	  if (strlen(lp) >= MAX_HMMNAME_LEN) {
	    jlog("Error: voca_load_htkdict: line %d: too long phone name: %s\n", linenum, lp);
	    winfo->errnum++;
	    *ok_flag = FALSE;
	    return TRUE;
	  }
	  p = cycle_triphone(lp);
	}
	else p = cycle_triphone_flush();
      } else {
	p = mystrtok(NULL, " \t\n");
      }
      if (p == NULL) break;

      /* both defined/pseudo phone is allowed */
      tmplg = htk_hmmdata_lookup_logical(hmminfo, p);
      if (tmplg == NULL) {
	/* not found */
	if (do_conv) {
	  /* both defined or pseudo phone are not found */
	  if (len == 0 && lp == NULL) {
	    jlog("Error: voca_load_htkdict: line %d: triphone \"*-%s+*\" or monophone \"%s\" not found\n", linenum, p, p);
	    snprintf(cbuf,MAX_HMMNAME_LEN,"*-%s+* or monophone %s", p, p);
	  } else if (len == 0) {
	    jlog("Error: voca_load_htkdict: line %d: triphone \"*-%s\" or biphone \"%s\" not found\n", linenum, p, p);
	    snprintf(cbuf,MAX_HMMNAME_LEN,"*-%s or biphone %s", p, p);
	  } else if (lp == NULL) {
	    jlog("Error: voca_load_htkdict: line %d: triphone \"%s+*\" or biphone \"%s\" not found\n", linenum, p, p);
	    snprintf(cbuf,MAX_HMMNAME_LEN,"%s+* or biphone %s", p, p);
	  } else {
	    jlog("Error: voca_load_htkdict: line %d: triphone \"%s\" not found\n", linenum, p);
	    snprintf(cbuf,MAX_HMMNAME_LEN,"%s", p);
	  }
	} else {
	  jlog("Error: voca_load_htkdict: line %d: phone \"%s\" not found\n", linenum, p);
	  snprintf(cbuf, MAX_HMMNAME_LEN, "%s", p);
	}
	add_to_error(winfo, cbuf);
	pok = FALSE;
      } else {
	/* found */
	if (len >= winfo->work_num) {
	  /* expand wseq area by PHONEMELEN_STEP */
	  winfo->work_num += PHONEMELEN_STEP;
	  winfo->work = (void *)mybmalloc2(sizeof(HMM_Logical *) * winfo->work_num, &(winfo->mroot));
	  memcpy(winfo->work, tmpwseq, sizeof(HMM_Logical *) * (winfo->work_num - PHONEMELEN_STEP));
	  tmpwseq = (HMM_Logical **)winfo->work;
	}
	/* store to temporal buffer */
	tmpwseq[len] = tmplg;
      }
      len++;
    }
    if (!pok) {			/* error in phoneme */
      jlog("Error: voca_load_htkdict: the line content was: %s\n", bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
    if (len == 0) {
      jlog("Error: voca_load_htkdict: line %d: no phone specified:\n> %s\n", linenum, bufbak);
      winfo->errnum++;
      *ok_flag = FALSE;
      return TRUE;
    }
    /* store to winfo */
    winfo->wseq[vnum] = (HMM_Logical **)mybmalloc2(sizeof(HMM_Logical *) * len, &(winfo->mroot));
    memcpy(winfo->wseq[vnum], tmpwseq, sizeof(HMM_Logical *) * len);
    winfo->wlen[vnum] = len;
  }

  vnum++;

  *vnum_p = vnum;
  
  return(TRUE);
}

/** 
 * @brief Convert whole words in word dictionary to word-internal triphone.
 *
 * Normally triphone conversion will be performed directly when reading
 * dictionary file.  This function is for post conversion only.
 * 
 * @param winfo [i/o] word dictionary information
 * @param hmminfo [in] HTK %HMM definition
 * 
 * @return TRUE on success, FALSE on failure.
 */
boolean
voca_mono2tri(WORD_INFO *winfo, HTK_HMM_INFO *hmminfo)
{
  WORD_ID w;
  int ph;
  char *p;
  HMM_Logical *tmplg;
  boolean ok_flag = TRUE;
  
  for (w=0;w<winfo->num;w++) {
    cycle_triphone(NULL);
    cycle_triphone(winfo->wseq[w][0]->name);

    for (ph = 0; ph < winfo->wlen[w] ; ph++) {
      if (ph == winfo->wlen[w] - 1) {
	p = cycle_triphone_flush();
      } else {
	p = cycle_triphone(winfo->wseq[w][ph + 1]->name);
      }
      if ((tmplg = htk_hmmdata_lookup_logical(hmminfo, p)) == NULL) {
	jlog("Error: voca_load_htkdict: word \"%s[%s]\"(id=%d): HMM \"%s\" not found\n", winfo->wname[w], winfo->woutput[w], w, p);
	ok_flag = FALSE;
	continue;
      }
      winfo->wseq[w][ph] = tmplg;
    }
  }
  return (ok_flag);
}

/** 
 * Append one word dictionary to other, for multiple grammar handling.
 * Assumes that the same %HMM definition is used on both word dictionary.
 * 
 * @param dstinfo [i/o] word dictionary
 * @param srcinfo [in] word dictionary to be appended to @a dst
 * @param coffset [in] category id offset in @a dst where the new data
 * should be stored
 * @param woffset [in] word id offset in @a dst where the new data
 * should be stored
 */
boolean
voca_append(WORD_INFO *dstinfo, WORD_INFO *srcinfo, int coffset, int woffset)
{
  WORD_ID n, w;
  int i;

  n = woffset;
  while (n >= dstinfo->maxnum) {
    if (winfo_expand(dstinfo) == FALSE) return FALSE;
  }
  for(w=0;w<srcinfo->num;w++) {
    /* copy data */
    dstinfo->wlen[n] = srcinfo->wlen[w];
    if (srcinfo->wname[w]) {
      dstinfo->wname[n] = strcpy((char *)mybmalloc2(strlen(srcinfo->wname[w])+1, &(dstinfo->mroot)), srcinfo->wname[w]);
    } else {
      dstinfo->wname[n] = NULL;
    }
    if (srcinfo->woutput[w]) {
      dstinfo->woutput[n] = strcpy((char *)mybmalloc2(strlen(srcinfo->woutput[w])+1, &(dstinfo->mroot)), srcinfo->woutput[w]);
    } else {
      dstinfo->woutput[n] = NULL;
    }
    if (srcinfo->wlen[w] > 0) {
      dstinfo->wseq[n] = (HMM_Logical **)mybmalloc2(sizeof(HMM_Logical *) * srcinfo->wlen[w], &(dstinfo->mroot));
      for(i=0;i<srcinfo->wlen[w];i++) {
	dstinfo->wseq[n][i] = srcinfo->wseq[w][i];
      }
    } else {
      dstinfo->wseq[n] = NULL;
    }
#ifdef CLASS_NGRAM
    dstinfo->cprob[n] = srcinfo->cprob[w];
    if (dstinfo->cprob[n] != 0.0) dstinfo->cwnum++;
#endif
    dstinfo->is_transparent[n] = srcinfo->is_transparent[w];
    /* offset category ID by coffset */
    dstinfo->wton[n] = srcinfo->wton[w] + coffset;
    
    n++;
    if (n >= dstinfo->maxnum) {
      if (winfo_expand(dstinfo) == FALSE) return FALSE;
    }

  }
  dstinfo->num = n;

  /* compute maxwn */
  voca_set_stats(dstinfo);

  return TRUE;
}