From c5fcf7179a83ef65c86c6a4a390029149e518649 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Tue, 5 Oct 2021 21:49:54 +0200
Subject: Duzy commit ze smieciami

---
 Semestr 2/racket/l9z17/solution.rkt | 266 ------------------------------------
 1 file changed, 266 deletions(-)
 delete mode 100644 Semestr 2/racket/l9z17/solution.rkt

(limited to 'Semestr 2/racket/l9z17/solution.rkt')

diff --git a/Semestr 2/racket/l9z17/solution.rkt b/Semestr 2/racket/l9z17/solution.rkt
deleted file mode 100644
index 5e98036..0000000
--- a/Semestr 2/racket/l9z17/solution.rkt	
+++ /dev/null
@@ -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
-- 
cgit v1.2.3