Duzy commit ze smieciami

1 files changed, 0 insertions, 266 deletions

diff --git a/Semestr 2/racket/l9z17/solution.rkt b/Semestr 2/racket/l9z17/solution.rkt
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--- a/Semestr 2/racket/l9z17/solution.rkt
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@@ -1,266 +0,0 @@
-#lang racket

-

-; Do programming.rkt dodajemy instrukcje

-

-(provide eval-while parse-while env-empty env-lookup)

-

-;;; We współpracy z Kacprem Soleckim

-

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

-; Wyrazenia ;

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

-

-(struct const       (val)      #:transparent)

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

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

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

-(struct letrec-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) (string? 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))]

-    [(letrec-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)]

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

-    [(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) 3) (eq? (first q) 'letrec))

-     (letrec-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 blackhole () #:transparent)

-(struct environ (xs) #:transparent)

-

-(define env-empty (environ null))

-(define (env-add x v env)

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

-(define (env-lookup x env)

-  (define (assoc-lookup xs)

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

-          [(eq? x (mcar (car xs)))

-             (match (mcdr (car xs))

-               [(blackhole) (error "Stuck forever in a black hole!")]

-               [x x])]

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

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

-(define (env-update! x v xs)

-  (define (assoc-update! xs)

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

-          [(eq? x (mcar (car xs))) (set-mcdr! (car xs) v)]

-          [else (env-update! x v (cdr xs))]))

-  (assoc-update! (environ-xs xs)))

-(define (env-update x v xs) ; <---------------------------------- !!!

-  (define (assoc-update xs)

-    (cond [(null? xs) (list (mcons x v))]

-          [(eq? x (mcar (car xs))) (cons (mcons x v) (cdr xs))]

-          [else (cons (car xs) (assoc-update (cdr xs)))]))

-  (environ (assoc-update (environ-xs xs))))

-

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

-; Ewaluacja ;

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

-

-(struct clo (id e env) #:transparent)

-(struct let-var (v)  #:transparent)

-

-(define (value? v)

-  (or (number? v)

-      (boolean? v)

-      (string? v)

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

-      (null? v)

-      (clo? v)

-      (blackhole? v)))

-

-(define (op->proc op)

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

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

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

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

-            ['eq? eq?]

-            [_ 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 (let-var (eval-env e1 env)) env))]

-    [(letrec-expr x e1 e2)

-     (let* ([new-env (env-add x (blackhole) env)]

-            [v (eval-env e1 new-env)])

-       (begin

-          (env-update! x v new-env)

-          (eval-env e2 new-env)))]

-    [(var-expr x) (let ((f (env-lookup x env)))

-                    (if (let-var? f) (let-var-v 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 (eval-env e1 env)

-                             (eval-env e2 env))]

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

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

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

-                  (eval-env body (env-add x ve (merge-let-vars env fun-env)))]))]))

-

-(define (merge-let-vars env1 env2)

-  (define (iter xs env)

-    (if (null? xs) 

-        env

-        (let ((cur-var (car xs)))

-          (if (let-var? (mcdr cur-var))

-              (iter (cdr xs) (env-add (mcar cur-var) (mcdr cur-var) env))

-              (iter (cdr xs) env)))))

-  (iter (reverse (environ-xs env2)) env1))

-

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

-

-; ---------------------------------------------------------------- !!!

-

-(struct skip   ()         #:transparent)

-(struct assign (x e)      #:transparent)

-(struct if-cmd (eb ct cf) #:transparent)

-(struct while  (eb cb)    #:transparent)

-(struct comp   (c1 c2)    #:transparent)

-

-(define (cmd? c)

-  (match c

-    [(skip) true]

-    [(assign x e) (and (symbol? x) (expr? e))]

-    [(if-cmd eb ct cf) (and (expr? eb) (cmd? ct) (cmd? cf))]

-    [(while eb ct) (and (expr? eb) (cmd? ct))]

-    [else false]))

-

-(define (parse-while q)

-  (cond

-    [(eq? q 'skip) (skip)]

-    [(null? q) (skip)]

-    [(and (list? q) (= (length q) 3) (eq? (second q) ':=))

-     (assign (first q)

-             (parse (third q)))]

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

-     (if-cmd (parse (second q))

-             (parse-while (third q))

-             (parse-while (fourth q)))]

-     [(and (list? q) (= (length q) 3) (eq? (car q) 'while))

-      (while (parse (second q))

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

-     [(and (list? q) (= (length q) 2))

-      (comp (parse-while (first q))

-            (parse-while (second q)))]

-     [(and (list? q) (> (length q) 2))

-      (comp (parse-while (first q))

-            (parse-while (cdr q)))]

-     [else (error "while parse error")]))

-

-(define (eval-while e env)

-  (match e

-    [(skip) env]

-    [(assign x e)

-     (env-update x (eval-env e env) env)]

-    [(if-cmd eb ct cf)

-     (if (eval-env eb env)

-         (eval-while ct env)

-         (eval-while cf env))]

-    [(while eb cb)

-     (if (eval-env eb env)

-         (eval-while e (eval-while cb env))

-         env)]

-     [(comp c1 c2) (eval-while c2 (eval-while c1 env))]))

-

-; zakladamy, ze program startuje z pamiecia w ktorej

-; aktwna jest zmienna t

-(define WHILE_FACT

-  '{(i := 1)

-    (while (> t 0)

-      {(i := (* i t))

-       (t := (- t 1))})})

-

-(define (fact n)

-  (let* ([init-env  (env-add 't n env-empty)]

-         [final-env

-           (eval-while (parse-while WHILE_FACT) init-env)])

-    (env-lookup 'i final-env)))

-    

-(define prog1 '{(x := 5)

-                (f := (let [x 50] (lambda (y) (+ x y))))

-                (x := 10)

-                (z := (f 0))})
\ No newline at end of file