(use-modules (rx irregex)
             (ice-9 match))


(define (match-to-kwargs irx string)
  (let ((rx-match (irregex-match irx string)))
    (if rx-match
        (map (match-lambda
               ((match-part . idx)
                (cons match-part
                      (irregex-match-substring
                       rx-match idx))))
             (irregex-match-names rx-match))
        #f)))


;; definite and indefinite, but not partitive articles
(define article '(or "the" "a" "an"))
(define preposition '(or "with" "in" "on" "out of" "at"))

(define split-verb-and-rest-irx
  (sre->irregex
   `(: (* space) (=> verb (+ alphanum))
       (? (+ space) (=> rest (* any))))))

;; TODO: we could make this MUCH FASTER if we didn't use irregex
;;   for this step!
(define (split-verb-and-rest string)
  (let* ((trimmed (string-trim-both string))
         (first-space (string-index trimmed #\space)))
    (if first-space
        `((verb . ,(substring trimmed 0 first-space))
          (rest . ,(substring trimmed (+ 1 first-space))))
        `((verb . ,trimmed)
          (rest . "")))))

;; @@: Not currently used
;; Borrowed from irregex.scm
(define match-string
  '(seq #\" (* (or (~ #\\ #\") (seq #\\ any))) #\"))

(define indirect-irx
  (sre->irregex
   `(: (? (: ,article (+ space)))  ; possibly an article (ignored)
       (=> direct-object (* any))  ; direct object
       (+ space) (=> preposition ,preposition) (+ space)
       (? (: ,article (+ space)))
       (=> indirect-object (+ any)))))

(define direct-irx
  `(: (? (: ,article (+ space)))    ; possibly an article (ignored)
      (=> direct-object (* any))))  ; direct object


(define say-example "say I really need to get going.")
(define attack-sword-example "hit goblin with sword")
(define attack-simple-example "hit goblin")
(define put-book-on-desk "put the book on the desk")