Duzy commit ze smieciami

1 files changed, 0 insertions, 187 deletions

diff --git a/Semestr 2/racket/l8z15/solution.bak b/Semestr 2/racket/l8z15/solution.bak
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-#lang racket

-

-; Do list.rkt dodajemy procedury

-;

-; Miejsca, ktore sie zmienily oznaczone sa przez !!!

-

-(provide parse eval)

-

-; --------- ;

-; Wyrazenia ;

-; --------- ;

-

-(struct const      (val)      #:transparent)

-(struct binop      (op l r)   #:transparent)

-(struct var-expr   (id)       #:transparent)

-(struct let-expr   (id e1 e2) #:transparent)

-(struct if-expr    (eb et ef) #:transparent)

-(struct cons-expr  (e1 e2)    #:transparent)

-(struct car-expr   (e)        #:transparent)

-(struct cdr-expr   (e)        #:transparent)

-(struct null-expr  ()         #:transparent)

-(struct null?-expr (e)        #:transparent)

-(struct app        (f e)      #:transparent) ; <------------------ !!!

-(struct lam        (id e)     #:transparent) ; <------------------ !!!

-

-(define (expr? e)

-  (match e

-    [(const n) (or (number? n) (boolean? n))]

-    [(binop op l r) (and (symbol? op) (expr? l) (expr? r))]

-    [(var-expr x) (symbol? x)]

-    [(let-expr x e1 e2)

-     (and (symbol? x) (expr? e1) (expr? e2))]

-    [(if-expr eb et ef)

-     (and (expr? eb) (expr? et) (expr? ef))]

-    [(cons-expr e1 e2) (and (expr? e1) (expr? e2))]

-    [(car-expr e) (expr? e)]

-    [(cdr-expr e) (expr? e)]

-    [(null-expr) true]

-    [(null?-expr e) (expr? e)]

-    [(app f e) (and (expr? f) (expr? e))] ; <--------------------- !!!

-    [(lam id e) (and (symbol? id) (expr? e))] ; <----------------- !!!

-    [_ false]))

-

-(define (parse q)

-  (cond

-    [(number? q) (const q)]

-    [(eq? q 'true)  (const true)]

-    [(eq? q 'false) (const false)]

-    [(eq? q 'null)  (null-expr)]

-    [(symbol? q) (var-expr q)]

-    [(and (list? q) (eq? (length q) 2) (eq? (first q) 'null?))

-     (null?-expr (parse (second q)))]

-    [(and (list? q) (eq? (length q) 3) (eq? (first q) 'cons))

-     (cons-expr (parse (second q))

-                (parse (third q)))]

-    [(and (list? q) (eq? (length q) 2) (eq? (first q) 'car))

-     (car-expr (parse (second q)))]

-    [(and (list? q) (eq? (length q) 2) (eq? (first q) 'cdr))

-     (cdr-expr (parse (second q)))]

-    [(and (list? q) (eq? (length q) 3) (eq? (first q) 'let))

-     (let-expr (first (second q))

-               (parse (second (second q)))

-               (parse (third q)))]

-    [(and (list? q) (eq? (length q) 4) (eq? (first q) 'if))

-     (if-expr (parse (second q))

-              (parse (third q))

-              (parse (fourth q)))]

-    [(and (list? q) (eq? (length q) 3) (eq? (first q) 'lambda)) ; <!!!

-     (parse-lam (second q) (third q))]

-    [(and (list? q) (pair? q) (not (op->proc (car q)))) ; <------- !!!

-     (parse-app q)]

-    [(and (list? q) (eq? (length q) 3) (symbol? (first q)))

-     (binop (first q)

-            (parse (second q))

-            (parse (third q)))]))

-

-(define (parse-app q) ; <----------------------------------------- !!!

-  (define (parse-app-accum q acc)

-    (cond [(= 1 (length q)) (app acc (parse (car q)))]

-          [else (parse-app-accum (cdr q) (app acc (parse (car q))))]))

-  (parse-app-accum (cdr q) (parse (car q))))

-

-(define (parse-lam pat e) ; <------------------------------------- !!!

-  (cond [(= 1 (length pat))

-         (lam (car pat) (parse e))]

-        [else

-         (lam (car pat) (parse-lam (cdr pat) e))]))

-

-; ---------- ;

-; Srodowiska ;

-; ---------- ;

-

-(struct environ (xs) #:transparent)

-

-(define env-empty (environ null))

-(define (env-add x v env)

-  (environ (cons (cons x v) (environ-xs env))))

-(define (env-lookup x env)

-  (define (assoc-lookup xs)

-    (cond [(null? xs) (error "Unknown identifier" x)]

-          [(eq? x (car (car xs))) (cdr (car xs))]

-          [else (assoc-lookup (cdr xs))]))

-  (assoc-lookup (environ-xs env)))

-

-; --------- ;

-; Ewaluacja ;

-; --------- ;

-

-(struct clo (id e env) #:transparent) ; <------------------------- !!!

-(struct odr (e env)    #:transparent)

-

-(define (value? v)

-  (or (number? v)

-      (boolean? v)

-      (and (pair? v) (value? (car v)) (value? (cdr v)))

-      (null? v)

-      (clo? v))) ; <---------------------------------------------- !!!

-

-(define (op->proc op)

-  (match op ['+ +] ['- -] ['* *] ['/ /] ['% modulo]

-            ['= =] ['> >] ['>= >=] ['< <] ['<= <=]

-            ['and (lambda (x y) (and x y))]

-            ['or  (lambda (x y) (or  x y))]

-            [_ false])) ; <--------------------------------------- !!!

-

-(define (eval-env e env)

-  (match e

-    [(const n) n]

-    [(binop op l r) ((op->proc op) (eval-env l env)

-                                   (eval-env r env))]

-    [(let-expr x e1 e2)

-     (eval-env e2 (env-add x (eval-env e1 env) env))]

-    [(var-expr x) (match (env-lookup x env)

-                    [(odr e env) (eval-env e env)]

-                    [f f])]

-    [(if-expr eb et ef) (if (eval-env eb env)

-                            (eval-env et env)

-                            (eval-env ef env))]

-    [(cons-expr e1 e2) (cons (odr e1 env)

-                             (odr e2 env))]

-    [(car-expr e) (let ([p (eval-env e env)])

-                    (match (car p)

-                      [(odr e env) (eval-env e env)]))]

-    [(cdr-expr e) (let ([p (eval-env e env)])

-                (match (cdr p)

-                  [(odr e env) (eval-env e env)]))]

-    [(null-expr) null]

-    [(null?-expr e) (null? (eval-env e env))]

-    [(lam x e) (clo x e env)] ; <--------------------------------- !!!

-    [(app f e) ; <------------------------------------------------ !!!

-     (let ([vf (eval-env f env)]

-           [ve (odr e env)])

-       (match vf [(clo x body fun-env)

-                  (eval-env body (env-add x ve fun-env))]))]))

-

-(define (eval e) (eval-env e env-empty))

-

-(define program

-  '(let [twice (lambda (f x) (f (f x)))]

-   (let [inc (lambda (x) (+ 1 x))]

-     (twice twice twice twice inc 1))))

-    

-

-;;; Testy wspólnie z Karolem Ochmanem

-

-(define (test-eval program) (eval (parse program)))

-

-(define program1

-  '((lambda (x) (+ 3 3)) (/ 5 0)))

-(define program2

-  '(let [if-fun (lambda (b t e) (if b t e))]

-     (if-fun true 4 (/ 5 0))))

-(define program3

-  '(car (cdr (cons 1 (cons 2 (cons 3 (cons 4 null)))))))

-(define program4

-  '(car (cons (+ 3 4) (/ 5 0))))

-(define program5

-  '(cons (+ 5 6) (- 4 3)))

-(define program6

-  '(car (cdr (cdr (car (cons (cons (/ 0 0) (cons (/ 0 0) (cons 1 (/ 0 0)))) (cdr (cons (/ 0 0) null))))))))

-;;; (test-eval program)

-;;; (test-eval program1)

-;;; (test-eval program2)

-;;; (test-eval program3)

-;;; (test-eval program4)

-;;; (test-eval program5)

-;;; (test-eval program6)
\ No newline at end of file