remise

project-2/step0.bak

@@ -0,0 +1,16 @@
+(define (point x y)
+  (define (dispatch m)
+    (cond ((eq? m 'getx) x)
+          ((eq? m 'gety) y)
+          ((eq? m 'type) 'point)
+          ((eq? m 'info) (list 'point x y))
+          (else (display (string-append "point as no method: " (symbol->string m) "\n")))))
+  dispatch)
+(define p (point 1 2))
+(p 'getx) ; 1
+(p 'gety) ; 2
+(p 'type) ; point
+(p 'info) ; (point 1 2)
+(p 'foo) ; display "point as no method: foo
+
+

project-2/step0.rkt

@@ -1,3 +1,10 @@
+;Auhors:Dubois Brieuc, Dubois Simon
+;Addapted from the example given in the assignment. Major change are:
+;   function directly defined in dispatch
+;   = changed to eq? to take symbol as input
+;   eror message added
+
+;Class definition
 (define (point x y)
   (define (dispatch m)
     (cond ((eq? m 'getx) x)
@@ -6,11 +13,13 @@
           ((eq? m 'info) (list 'point x y))
           (else (display (string-append "point as no method: " (symbol->string m) "\n")))))
   dispatch)
+
+;Usage example 
 (define p (point 1 2))
 (p 'getx) ; 1
 (p 'gety) ; 2
 (p 'type) ; point
 (p 'info) ; (point 1 2)
-(p 'foo) ; display "point as no method: foo
+(p 'foo) ; display "point as no method: foo"
 
 

project-2/step1.bak

@@ -0,0 +1,34 @@
+(define (point x y)
+  (define (self m)
+    (cond ((eq? m 'getx) (lambda () x))
+          ((eq? m 'gety) (lambda () y))
+          ((eq? m 'type) (lambda () 'point))
+          ((eq? m 'setx!) (lambda (nx) (set! x nx)))
+          ((eq? m 'sety!) (lambda (ny) (set! y ny)))
+          ((eq? m 'info) (lambda () (list 'point x y)))
+          ((eq? m 'add) (lambda (p)
+                          (let ((px ((p 'getx)))
+                                (py ((p 'gety))))
+                            (point (+ x px) (+ y py)))))
+          ((eq? m 'sub) (lambda (p)
+                          (let ((px ((p 'getx)))
+                                (py ((p 'gety))))
+                            (point (- x px) (- y py)))))
+          (else (lambda () (display (string-append "Message not understood: " (symbol->string m) "\n"))))))
+  self)
+
+(define p1 (point 1 2))
+(define p2 (point 3 4))
+((p1 'getx)) ; returns 1
+((p1 'gety)) ; returns 2
+((p2 'getx)) ; returns 3
+((p2 'gety)) ; returns 4
+(define pp ((p1 'add) p2)) ; returns a new point pp
+((pp 'info)) ; returns (point 4 6)
+(define pn ((p1 'sub) p2)) ; returns a new point pn
+((pn 'info)) ; returns (point -2 -2)
+((pp 'foo)) ; should display "Message not understood" error
+((p1 'setx!) 5)
+((p1 'sety!) 5)
+((p1 'info)) ; returns (point 5 5)
+

project-2/step1.rkt

@@ -1,3 +1,8 @@
+;Auhors:Dubois Brieuc, Dubois Simon
+;Added lambda function to allow for aguments in methodes
+;We renamed dispatch as self
+
+;Class definition
 (define (point x y)
   (define (self m)
     (cond ((eq? m 'getx) (lambda () x))
@@ -17,6 +22,7 @@
           (else (lambda () (display (string-append "Message not understood: " (symbol->string m) "\n"))))))
   self)
 
+;Usage example
 (define p1 (point 1 2))
 (define p2 (point 3 4))
 ((p1 'getx)) ; returns 1

project-2/step2+3a.rkt

@@ -1,4 +1,13 @@
+;Auhors:Dubois Brieuc, Dubois Simon
+;This is the step 2 and step 3a combined
+;Here we extracted the method definitons from the
+;dispatch(self) function. We also implented a send
+;function that allow to request a method from an object
+;an pass it argument.
+
+;Class definition
 (define (point x y)
+  ;Method definition
   (define (getx) (lambda () x))
   (define (gety) (lambda () y))
   (define (type) (lambda () 'point))
@@ -17,6 +26,7 @@
                     (point (- x px) (- y py))
                    )
                  ))
+  ;message handeling method
   (define (self m)
     (cond ((eq? m 'getx) (getx))
           ((eq? m 'gety) (gety))
@@ -30,6 +40,7 @@
   self
  )
 
+
 (define (method-lookup reciever message)
   (if (= (length message) 1)
       ((reciever (car message)))
@@ -43,7 +54,7 @@
   )
  )
 
-
+;Usage example
 (define p1 (point 1 2))
 (define p2 (point 3 4))
 (send p1 'getx) ; 1

project-2/step2.bak

@@ -0,0 +1,39 @@
+(define (point x y)
+  (define (self m)
+    (cond ((eq? m 'getx) (lambda () x))
+          ((eq? m 'gety) (lambda () y))
+          ((eq? m 'type) (lambda () 'point))
+          ((eq? m 'setx!) (lambda (nx) (set! x nx)))
+          ((eq? m 'sety!) (lambda (ny) (set! y ny)))
+          ((eq? m 'info) (lambda () (list 'point x y)))
+          ((eq? m 'add) (lambda (p)
+                          (let ((px ((p 'getx)))
+                                (py ((p 'gety))))
+                            (point (+ x px) (+ y py)))))
+          ((eq? m 'sub) (lambda (p)
+                          (let ((px ((p 'getx)))
+                                (py ((p 'gety))))
+                            (point (- x px) (- y py)))))
+          (else (lambda () (display (string-append "Message not understood: " (symbol->string m) "\n"))))))
+  self)
+
+(define (send obj . args)
+  (if (procedure? obj)
+      (if (= (length args) 1)
+          ((obj (car args)))
+          ((obj (car args)) (car (cdr args))))  ; Extracting the second argument
+      (display (string-append "Inappropriate receiver object: " (symbol->string obj) "\n"))))
+
+(define p1 (point 1 2))
+(define p2 (point 3 4))
+(send p1 'getx) ; 1
+(send p1 'gety) ; 2
+(send p2 'getx) ; 3
+(send p2 'gety) ; 4
+(define p (send p1 'add p2))
+(send p 'info) ; (point 4 6)
+(send 'not-a-point 'info) ; should display "Inappropriate receiver object"
+(send p 'foo) ; should display "Message not understood"
+(send p 'bar 2) ; should display "Message not understood"
+(send p1 'setx! 5)
+(send p1 'getx) ; returns 5

project-2/step3b.bak

@@ -0,0 +1,114 @@
+(define (object)
+	(define super 'nil)
+	(define (self m)
+		(cond
+			((eq? m 'type) (lambda () 'object))
+		  (else (lambda args (display (string-append "Message not understood: " (symbol->string m) "\n"))))
+		)
+	)
+	self
+)
+
+(define (point x y)
+	(define super (object))
+  (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 () (list 'point x y)))
+  (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 (self m)
+    (cond ((eq? m 'getx) (getx))
+          ((eq? m 'gety) (gety))
+          ((eq? m 'type) (type))
+          ((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 (cons m args))))
+		)
+	)
+  self
+ )
+
+(define (color-point x y color)
+	(define super (point x y))
+	(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 (self m)
+		(cond ((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))))
+		)
+	)
+	self
+)
+
+(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 o (object))
+(send o 'type) ; object
+(send o 'foo) ; should display "Message not understood"
+
+(define p1 (point 1 2))
+(define p2 (point 3 4))
+(send p1 'getx) ; 1
+(send p1 'gety) ; 2
+(send p2 'getx) ; 3
+(send p2 'gety) ; 4
+(define p (send p1 'add p2))
+(send p 'info) ; (point 4 6)
+
+(define cp (color-point 5 6 'red))
+(send cp 'type) ; color−point
+(send cp 'getx) ; 5
+(send cp 'gety) ; 6
+(send cp 'get-color) ; red
+(send cp 'info)
+
+(define cp−1 (send cp 'add (color-point 1 2 'green)))
+(send cp−1 'type) ; color−point
+(send cp−1 'getx) ; 6
+(send cp−1 'gety) ; 8
+(send cp−1 'get-color) ; red

project-2/step3b.rkt

@@ -1,3 +1,6 @@
+;Auhors:Dubois Brieuc, Dubois Simon
+;Here we intoduced inheritance by creating a basic object class that work as parent class for all other class
+;We also created the class color point inheriting from the class point
 (define (object)
 	(define super 'nil)
 	(define (self m)
@@ -87,6 +90,7 @@
   )
  )
 
+;Usage example
 (define o (object))
 (send o 'type) ; object
 (send o 'foo) ; should display "Message not understood"

project-2/step4.rkt

@@ -1,3 +1,5 @@
+;Auhors:Dubois Brieuc, Dubois Simon
+;Here we intoduced the dynamic binding of self. We added the new method allowing to create new instance of a class.
 (define (object)
 	(define super 'nil)
 	(define self 'nil)
@@ -110,9 +112,10 @@
 	)
 )
 
+;Usage example
 (define cp (new color-point 5 6 'red))
 (send cp 'type) ; color−point
 (send cp 'getx) ; 5
 (send cp 'gety) ; 6
 (send cp 'get-color) ; red
-(send cp 'info) ; (color−point 5 6 red
+(send cp 'info) ; (color−point 5 6 red)