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;;;                Centre for Speech Technology Research                  ;;
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;;;
;;;  Tokenization rules for spanish
;;;
;;;  Particularly numbers and symbols.
;;; 
;;; As the "el" database has no dipthongs, numbers sound much
;;; better removing the weak vowel ("ventiuno" instead of "veintiuno")
;;; Many speakers do this, so no problem with it.
    
(define (spanish_number name)
"(spanish_number name)
Convert a string of digits into a list of words saying the number."
  (if (string-matches name "0")
      (list "cero")
      (spanish_number_from_digits (symbolexplode name))))

(define (just_zeros digits)
"(just_zeros digits)
If this only contains 0s then we just do something different."
 (cond
  ((not digits) t)
  ((string-equal "0" (car digits))
   (just_zeros (cdr digits)))
  (t nil)))

(define (spanish_number_from_digits digits)
  "(spanish_number_from_digits digits)
Takes a list of digits and converts it to a list of words
saying the number."
  (let ((l (length digits)))
    (cond
     ((equal? l 0)
      nil)
     ((string-equal (car digits) "0")
      (spanish_number_from_digits (cdr digits)))
     ((equal? l 1);; single digit
      (cond 
       ((string-equal (car digits) "0") (list "cero"))
       ((string-equal (car digits) "1") (list "un"))
       ((string-equal (car digits) "2") (list "dos"))
       ((string-equal (car digits) "3") (list "tres"))
       ((string-equal (car digits) "4") (list "cuatro"))
       ((string-equal (car digits) "5") (list "cinco"))
       ((string-equal (car digits) "6") (list "seis"))
       ((string-equal (car digits) "7") (list "siete"))
       ((string-equal (car digits) "8") (list "ocho"))
       ((string-equal (car digits) "9") (list "nueve"))
       ;; fill in the rest
       (t (list "equis"))));; $$$ what should say?
     ((equal? l 2);; less than 100
      (cond
       ((string-equal (car digits) "0");; 0x
	(spanish_number_from_digits (cdr digits)))
     
       ((string-equal (car digits) "1");; 1x
	(cond
	 ((string-equal (car (cdr digits)) "0") (list "diez"))
	 ((string-equal (car (cdr digits)) "1") (list "once"))
	 ((string-equal (car (cdr digits)) "2") (list "doce"))
	 ((string-equal (car (cdr digits)) "3") (list "trece"))
	 ((string-equal (car (cdr digits)) "4") (list "catorce"))
	 ((string-equal (car (cdr digits)) "5") (list "quince"))
	 (t 
	  (cons "dieci" (spanish_number_from_digits (cdr digits))))))
     
       ((string-equal (car digits) "2");; 2x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "veinte")
	    (cons "venti" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "3");; 3x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "treinta")
	    (cons "trentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "4");; 4x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "cuarenta")
	    (cons "cuarentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "5");; 5x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "cincuenta")
	    (cons "cincuentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "6");; 6x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "sesenta")
	    (cons "sesentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "7");; 7x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "setenta")
	    (cons "setentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "8");; 8x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "ochenta")
	    (cons "ochentai" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "9");; 9x
	(if (string-equal (car (cdr digits)) "0") 
	    (list "noventa")
	    (cons "noventai" (spanish_number_from_digits (cdr digits)))))

       ))

     ((equal? l 3);; in the hundreds
      (cond 
     
       ((string-equal (car digits) "1");; 1xx
	(if (just_zeros (cdr digits)) (list "cien")
	    (cons "ciento" (spanish_number_from_digits (cdr digits)))))

       ((string-equal (car digits) "5");; 5xx
	(cons "quinientos" (spanish_number_from_digits (cdr digits))))

       ((string-equal (car digits) "7");; 7xx
	(cons "setecientos" (spanish_number_from_digits (cdr digits))))

       ((string-equal (car digits) "9");; 9xx
	(cons "novecientos" (spanish_number_from_digits (cdr digits))))

       (t;; ?xx
	(append (spanish_number_from_digits (list (car digits))) 
		(list "cientos") 
		(spanish_number_from_digits (cdr digits))))
       ))

     ((< l 7)
      (let ((sub_thousands 
	     (list 
	      (car (cdr (cdr (reverse digits))))
	      (car (cdr (reverse digits)))
	      (car (reverse digits))))
	    (thousands (reverse (cdr (cdr (cdr (reverse digits)))))))
	(set! x (spanish_number_from_digits thousands))
	(append
	 (if (string-equal (car x) "un") nil x)
	 (list "mil")
	 (spanish_number_from_digits sub_thousands))))

     ((< l 13)
      (let ((sub_million 
	     (list 
	      (car (cdr (cdr (cdr (cdr (cdr(reverse digits)))))))
	      (car (cdr (cdr (cdr (cdr (reverse digits))))))
	      (car (cdr (cdr (cdr (reverse digits)))))
	      (car (cdr (cdr (reverse digits))))
	      (car (cdr (reverse digits)))
	      (car (reverse digits))
	      ))
	    (millions (reverse (cdr (cdr (cdr (cdr (cdr (cdr (reverse digits))))))))))
	(set! x (spanish_number_from_digits millions))
	(append
	 (if (string-equal (car x) "un") 
	     (list "un" "millon") 
	     (append x (list "millones")))
	 (spanish_number_from_digits sub_million))))

     (t
      (list "un" "numero" "muy" "gr'aaaaaandee")))))
      

(define (spanish_token_to_words token name)
  "(spanish_token_to_words TOKEN NAME)
Returns a list of words for the NAME from TOKEN.  This primarily
allows the treatment of numbers, money etc."
  (cond
   ((string-matches name "[1-9][0-9]+")
    (spanish_number name))
   ((not (lts.in.alphabet name 'spanish_downcase))
    ;; It contains some other than the lts can deal with
    (let ((subwords))
      (item.set_feat token "pos" "nn")
      (mapcar
       (lambda (letter)
	 ;; might be symbols or digits
	 (set! subwords
	       (append
		subwords
		(cond
		 ((string-matches letter "[0-9]")
		  (spanish_number letter))
		 ((string-matches letter "[A-Z辽陀谲裖")
		    (spanish_downcase letter))
		 (t
		  (list letter))))))
       (symbolexplode name))
      subwords))
   (t
    (list name))))

(provide 'sptoken)