This commit is contained in:
Brieuc Dubois 2024-04-25 20:35:17 +02:00
parent 82f33c2a8c
commit 83ae721927
1 changed files with 118 additions and 0 deletions

118
project-2/step4.rkt Normal file
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(define (object)
(define super 'nil)
(define self 'nil)
(define (set-self!) (lambda (s) (set! self s)))
(define (internal m)
(cond
((eq? m 'type) (lambda () 'object))
((eq? m 'info) (lambda () (list (send self 'type))))
((eq? m 'set-self!) (set-self!))
(else (lambda args (display (string-append "Message not understood: " (symbol->string m) "\n"))))
)
)
internal
)
(define (point x y)
(define super (object))
(define self 'nil)
(define (set-self!) (lambda (s)
(set! self s)
(method-lookup super (list 'set-self! s))
))
(define (getx) (lambda () x))
(define (gety) (lambda () y))
(define (type) (lambda () 'point))
(define (setx!) (lambda (nx) (set! x nx)))
(define (sety!) (lambda (ny) (set! y ny)))
(define (info) (lambda () (append ((super 'info)) (list x))))
(define (add) (lambda (p)
(let ((px ((p 'getx)))
(py ((p 'gety))))
(point (+ x px) (+ y py))
)
))
(define (sub) (lambda (p)
(let ((px ((p 'getx)))
(py ((p 'gety))))
(point (- x px) (- y py))
)
))
(define (internal m)
(cond ((eq? m 'set-self!) (set-self!))
((eq? m 'type) (type))
((eq? m 'getx) (getx))
((eq? m 'gety) (gety))
((eq? m 'setx!) (setx!))
((eq? m 'sety!) (sety!))
((eq? m 'info) (info))
((eq? m 'add) (add))
((eq? m 'sub) (sub))
(else (lambda args (method-lookup super (list m args))))
)
)
internal
)
(define (color-point x y color)
(define super (point x y))
(define self 'nil)
(define (set-self!) (lambda (s)
(set! self s)
(method-lookup super (list 'set-self! s))
))
(define (type) (lambda () 'color-point))
(define (get-color) (lambda () color))
(define (info) (lambda () (append ((super 'info)) (list color))))
(define (add) (lambda (p)
(let ((px ((p 'getx)))
(py ((p 'gety))))
(color-point (+ x px) (+ y py) color)
)
))
(define (sub) (lambda (p)
(let ((px ((p 'getx)))
(py ((p 'gety))))
(color-point (- x px) (- y py) color)
)
))
(define (internal m)
(cond ((eq? m 'set-self!) (set-self!))
((eq? m 'type) (type))
((eq? m 'get-color) (get-color))
((eq? m 'info) (info))
((eq? m 'add) (add))
(else (lambda args (method-lookup super (cons m args))))
)
)
internal
)
(define (method-lookup reciever message)
(if (= (length message) 1)
((reciever (car message)))
((reciever (car message)) (car (cdr message)))
))
(define (send reciever . message)
(if (procedure? reciever)
(method-lookup reciever message)
(display (string-append "Inappropriate receiver object: " (symbol->string reciever) "\n"))
)
)
(define (new cls . args)
(let ((object (apply cls args)))
(send object 'set-self! object)
object
)
)
(define cp (new color-point 5 6 'red))
(send cp 'type) ; colorpoint
(send cp 'getx) ; 5
(send cp 'gety) ; 6
(send cp 'get-color) ; red
(send cp 'info) ; (colorpoint 5 6 red