8a6eb8bfb0d27a6a9a40be3f9dce03233a1ee15f — Phil Hagelberg 9 months ago 0f1afd3
Now member is part of microscheme.
1 files changed, 9 insertions(+), 21 deletions(-)

M menelaus.scm
M menelaus.scm => menelaus.scm +9 -21
@@ 16,23 16,12 @@

;;;;;;;;;;;;;;;;;;; utils

(define (member v lst)
  (if (null? lst)
      (if (equal? v (car lst))
          (member v (cdr lst)))))

;; we need a numeric value to represent not-found; microscheme only has unsigned
;; ints but this will still get us a reasonable not-found value
(define not-found (- 0 1))

(define (find-aux v x n max)
  (if (= x (or (vector-ref v n) not-found))
      (if (= n max)
          (find-aux v x (+ n 1) max))))
  (let ((y (vector-ref v n)))
    (if (and y (= x y))
        (and (< n max)
             (find-aux v x (+ n 1) max)))))

(define (find v x)
  (find-aux v x 0 (- (vector-length v) 1)))

@@ 96,16 85,15 @@

(define (remove-last-down-aux key n)
  (if (< n 9)
      (if (equal? key (vector-ref last-keys-down n))
          (vector-set! last-keys-down n #f)
          (remove-last-down-aux key (+ n 1)))
  (if (equal? key (vector-ref last-keys-down n))
      (vector-set! last-keys-down n #f)
      (and (< n 9) (remove-last-down-aux key (+ n 1)))))

(define (add-last-down key) (add-last-down-aux key 0))
(define (remove-last-down key) (remove-last-down-aux key 0))

(define (remove-aux v lst checked all?)
  ;; also missing the cond form
  (if (null? lst)
      (reverse checked)
      (if (equal? v (car lst))