/*************************************************************************/
/*                                                                       */
/*                Centre for Speech Technology Research                  */
/*                     University of Edinburgh, UK                       */
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/*************************************************************************/
/*             Author :  Alan W Black                                    */
/*             Date   :  April 1996                                      */
/*-----------------------------------------------------------------------*/
/*                                                                       */
/* A front end to the letter to sound rule system(s)                     */
/*                                                                       */
/*=======================================================================*/
#include <stdio.h>
#include "festival.h"
#include "lexicon.h"
#include "lts.h"

static LISP lts_create_entry(const EST_String &word,
			     LISP features,LISP syllables);
static LISP map_phones(LISP phones);

LISP lts(const EST_String &word,LISP features,const EST_String &rulesetname)
{
    /* Return lexical entry for given word in best possible way */
    LISP phones;
    EST_String dword = downcase(word);
    LISP lword = strintern(dword);
    LISP lrulesetname = rintern(rulesetname);

    if (lts_in_alphabet(lword,lrulesetname) != NIL)
    {   // this check doesn't guarantee success
	phones = lts_apply_ruleset(lword,lrulesetname);
    }
    else
	phones = NIL; // otherwise can't do anything

    return lts_create_entry(word, features, 
			    lex_syllabify(map_phones(phones)));

}

static LISP lts_create_entry(const EST_String &word,LISP features,LISP syllables)
{
    /* build an entry from information */

    return cons(strcons(strlen(word),word),
		cons(features,cons(syllables,NIL)));
}

static LISP map_phones(LISP phones)
{
    // map list of phones to lexical list of phones 

    // Users responsibility to get right phone set
    return phones;

    // If lts rulesets get their own phonesets then the following should
    // be used (with appropriate changes)
#if 0
    LISP mapped = NIL,p;
    EST_String lexset,mappedph;
    
    lexset = lex_current_phoneset();

    if (lexset != "nrl")
    {
	for (p=phones; p != NIL; p=cdr(p))
	{
	    mappedph = map_phone(get_c_string(car(p)),"nrl",lexset);
	    mapped = cons(rintern(mappedph),mapped);
	}
	return reverse(mapped);
    }
    else
	return phones;
#endif
}

