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(use-modules (xlat))

(define (active-aorist-root present-root)
  (let ((last-syllable (car present-root)))
    (case (car last-syllable)
      ((#\@)
       (set-car! last-syllable #\s))
      ((#\z)
       (set-car! last-syllable #\s)) ;; FIXME: not always
      ((#\k)
       (cond
	((and (not (null? (cdr last-syllable)))
	      (char=? (cadr last-syllable) #\s))
	 (set! last-syllable (cons #\x (cddr last-syllable))))
	(else
	 (set-car! last-syllable #\x))))
      ((#\n)
       (cond
	((and (not (null? (cdr last-syllable)))
	      (char=? (cadr last-syllable) #\h))
	 (set! last-syllable (cons #\x (cddr last-syllable))))
	(else
	 (set-car! last-syllable #\s))))
      ((#\g #\h)
       (set-car! last-syllable #\x))
      ((#\p #\b #\f)
       (set-car! last-syllable #\*))
      ((#\y)
       (cond
	((and (not (null? (cdr last-syllable)))
	      (or (char=? (cadr last-syllable) #\a)
		  (char=? (cadr last-syllable) #\e)))
	 (set! last-syllable (cons #\* (cdr last-syllable))))))
      (else
       (throw 'grammar "Dont't know how to handle " present-root)))
    (cons last-syllable (cdr present-root))))


(define (aor str)
  (active-aorist-root (cdr (greek-normalize str))))


(define (add-flection word flect)
  (let* ((syl-list (append (cdr flect) (cdr word)))
	 (acc-pos (or (car flect)
		      (and (car word)
			   (+ (car word) (length (cdr flect)))))))
    (cons
     (if (and acc-pos (> acc-pos 3))
	 3
	 acc-pos)
     syl-list)))

; FIXME: Should return real augment!
(define (get-augment root)
  #\e)

; FIXME: Does not handle verbs with internal augment
(define (create-paratatikos-A root flect)
  (let ((word (add-flection root flect)))
    (cons 3 
	  (if (< (length (cdr word)) 3)
	      (append (cdr word) (list (list (get-augment root))))
	      (cdr word)))))

(define (create-paratatikos-B root flect)
  (add-flection root (add-flection (greek->xlat "ούσ")
				   (cons
				    #f
				    (cdr flect)))))

(define (create-prostaktiki-enestota root flect)
  (let ((w (add-flection root flect)))
    (cond
     ((car flect)
      (cons (car flect) (cdr w)))
     ((>= (length (cdr w)) 3)
      (cons 3 (cdr w)))
     ((not (car w))
      (cons (length (cdr w)) (cdr w)))
     (else
      w))))

;; Verbal form Accessors
(define (vtab-root tab)
  (car tab))

(define (vtab-analizer tab)
  (list-ref tab 2))

(define (vtab-composer tab)
  (or (list-ref tab 1)
      add-flection))

(define (vtab-flection tab person)
  (list-ref tab (+ person 2)))

;;
(define (flect-list root composer analizer . p)
  (append
   (list root composer analizer)
   (map
    (lambda (pers)
      (map
       greek->xlat
       pers))
    p)))

;;
(define verbal-flect-table
  (list
   (cons "Α"
	 (list 
	  (cons "ενεργητηκή"
		(list
		 (cons "οριστική"
		       (list
			(cons "ενεστώτας"
			      (flect-list
			       #:present-root
			       #f
			       #f
			       (list "ω")
			       (list "εις")
			       (list "ει")
			       (list "ουμε")
			       (list "ετε")
			       (list "ουν" "ουνε")))
			(cons "παρατατικός"
			      (flect-list
			       #:present-root
			       create-paratatikos-A
			       #f
			       (list "α")
			       (list "ες")
			       (list "ε")
			       (list "αμε")
			       (list "ατε")
			       (list "αν" "ανε")))
			(cons "μέλλοντας διαρκείας"
			      (flect-list
			       #:present-root
			       #f ;; FIXME: "θα"
			       #f
			       (list "ω")
			       (list "εις")
			       (list "ει")
			       (list "ουμε")
			       (list "ετε")
			       (list "ουν" "ουνε")))))

		 (cons "προστακτική"
		       (list
			(cons "ενεστώτας"
			      (flect-list
			       #:present-root
			       create-prostaktiki-enestota
			       #f
			       '()
			       (list "ε")
			       '()
			       '()
			       (list "ετε")
			       '())))) ))))
   (cons "Β1"
	 (list 
	  (cons "ενεργητηκή"
		(list
		 (cons "οριστική"
		       (list
			(cons "ενεστώτας"
			      (flect-list
			       #:present-root
			       #f
			       #f
			       (list "άω")
			       (list "άς")
			       (list "ά" "άει")
			       (list "άμε")
			       (list "άτε")
			       (list "ούν" "ούνε")))
			(cons "παρατατικός"
			      (flect-list
			       #:present-root
			       create-paratatikos-B
			       #f
			       (list "α")
			       (list "ες")
			       (list "ε")
			       (list "αμε")
			       (list "ατε")
			       (list "αν" "ανε")))
			(cons "μέλλοντας διαρκείας"
			      (flect-list
			       #:present-root
			       #f ;; FIXME: "θα"
			       #f
			       (list "άω")
			       (list "άς")
			       (list "ά" "άει")
			       (list "άμε")
			       (list "άτε")
			       (list "ούν" "ούνε"))) ))

		 (cons "προστακτική"
		       (list
			(cons "ενεστώτας"
			      (flect-list
			       #:present-root
			       create-prostaktiki-enestota
			       #f
			       '()
			       (list "α")
			       '()
			       '()
			       (list "άτε")
			       '())))) ))))
   (cons "Β2"
	 (list 
	  (cons "ενεργητηκή"
		(list
		 (cons "οριστική"
		       (list
			(cons "ενεστώτας"
			      (flect-list
			       #:present-root
			       #f
			       #f
			       (list "ώ")
			       (list "είς")
			       (list "εί")
			       (list "ούμε")
			       (list "είτε")
			       (list "ούν" "ούνε")))
			(cons "παρατατικός"
			      (flect-list
			       #:present-root
			       create-paratatikos-B
			       #f
			       (list "α")
			       (list "ες")
			       (list "ε")
			       (list "αμε")
			       (list "ατε")
			       (list "αν" "ανε")))
			(cons "μέλλοντας διαρκείας"
			      (flect-list
			       #:present-root
			       #f ;; FIXME: "θα"
			       #f
			       (list "ώ")
			       (list "είς")
			       (list "εί")
			       (list "ούμε")
			       (list "είτε")
			       (list "ούν" "ούνε"))) ))))))))

(define (verbal-flect-table-lookup table form-list)
  (if (null? form-list)
      table 
      (let ((entry (assoc (car form-list) table)))
	(if entry
	    (verbal-flect-table-lookup (cdr entry) (cdr form-list))
	    #f))))
  
(define (find-verbal-form . rest)
  (verbal-flect-table-lookup verbal-flect-table rest))


(define (conjugate root pers forms)
  (let ((tab (verbal-flect-table-lookup verbal-flect-table forms)))
    (if (not tab)
	(throw 'grammar "Verbal form not found " forms))
    (let ((func (vtab-composer tab))
	  (root-selector (vtab-root tab)))
      
      (map
       (lambda (x)
	 (func root x))
       (vtab-flection tab pers)))))
       
(define (conjugate-v root pers . forms)
  (conjugate root pers forms))

;; Test

(define (conj-all root . rest)
  (map (lambda (x)
	 (display x)(display "/"))
       rest)
  (newline)
  (do ((i 1 (1+ i)))
      ((> i 6) #f)
    (map
     (lambda (x)
       (display (xlat->greek x))(display ","))
     (conjugate (greek->xlat root) i rest))
    (newline)))
  

;(conj-all "βεβαίων" "Α" "ενεργητηκή" "οριστική"  "ενεστώτας")
;(newline)

;(conj-all "βεβαίων" "Α" "ενεργητηκή" "οριστική"  "παρατατικός")
;(newline)

;(conj-all "ντυν" "Α" "ενεργητηκή" "προστακτική" "ενεστώτας")
;(newline)
;(conj-all "βεβαίων" "Α" "ενεργητηκή" "προστακτική" "ενεστώτας")
;(newline)
;(conj-all "διαβάζ" "Α" "ενεργητηκή" "προστακτική" "ενεστώτας")
;(newline)

;(conj-all "λύν" "Α" "ενεργητηκή" "οριστική"  "παρατατικός")
;(newline)

;(conj-all "νικ" "Β1" "ενεργητηκή" "οριστική"  "ενεστώτας")
;(newline)

;(conj-all "νικ" "Β1" "ενεργητηκή" "οριστική"  "παρατατικός")
;(newline)

;(conj-all "νικ" "Β1" "ενεργητηκή" "προστακτική" "ενεστώτας")
;(newline)

;(conj-all "θεωρ" "Β2" "ενεργητηκή" "οριστική"  "ενεστώτας")
;(newline)
       
;(conj-all "θεωρ" "Β2" "ενεργητηκή" "οριστική"  "παρατατικός")
;(newline)

;(display (xlat->greek (cons #f (active-aorist-root (cdr (greek->xlat "ιατρευ"))))))
;(newline)
	

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