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/l7z13/solution.rkt | 104 ------------------------------------
 1 file changed, 104 deletions(-)
 delete mode 100644 Semestr 2/racket/l7z13/solution.rkt

(limited to 'Semestr 2/racket/l7z13')

diff --git a/Semestr 2/racket/l7z13/solution.rkt b/Semestr 2/racket/l7z13/solution.rkt
deleted file mode 100644
index 0a0278a..0000000
--- a/Semestr 2/racket/l7z13/solution.rkt	
+++ /dev/null
@@ -1,104 +0,0 @@
-#lang racket
-
-(provide (struct-out const) (struct-out binop) (struct-out var-expr) (struct-out let-expr) (struct-out var-dead) find-dead-vars)
-
-
-; --------- ;
-; Wyrazenia ;
-; --------- ;
-
-(struct const    (val)      #:transparent)
-(struct binop    (op l r)   #:transparent)
-(struct var-expr (id)       #:transparent)
-(struct var-dead (id)       #:transparent)
-(struct let-expr (id e1 e2) #:transparent)
-
-(define (expr? e)
-  (match e
-    [(const n) (number? n)]
-    [(binop op l r) (and (symbol? op) (expr? l) (expr? r))]
-    [(var-expr x) (symbol? x)]
-    [(var-dead x) (symbol? x)]
-    [(let-expr x e1 e2) (and (symbol? x) (expr? e1) (expr? e2))]
-    [_ false]))
-
-(define (parse q)
-  (cond
-    [(number? q) (const q)]
-    [(symbol? q) (var-expr 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) (symbol? (first q)))
-     (binop (first q)
-            (parse (second q))
-            (parse (third q)))]))
-
-; ---------------------------------- ;
-; Wyszukaj ostatnie uzycie zmiennych ;
-; ---------------------------------- ;
-
-(struct environ (xs))
-
-(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 "unbound identifier" x)]
-          [(eq? x (car (car xs))) (cdr (car xs))]
-          [else (assoc-lookup (cdr xs))]))
-  (assoc-lookup (environ-xs env)))
-(define (env-erase x env)
-  (define (assoc-lookup xs)
-    (cond [(null? xs) (error "unbound identifier" x)]
-          [(eq? x (caar xs)) (cdr xs)]
-          [else (cons (car xs) (assoc-lookup (cdr xs)))]))
-  (if (env-lookup x env)
-      (environ (assoc-lookup (assoc-lookup (environ-xs env))))
-      (environ (assoc-lookup (environ-xs env)))))
-
-
-(define (find-dead-vars-env e env)
-  (match e
-    [(const r) (cons (const r) env)]
-    [(var-expr x) (if (env-lookup x env)
-                     (cons (var-expr x) env)
-                     (cons (var-dead x) (env-add x true env)))]
-    [(binop op l r) (let* ((right-expr (find-dead-vars-env r env))
-                           (r (car right-expr))
-                           (env (cdr right-expr))
-                           (left-expr (find-dead-vars-env l env))
-                           (l (car left-expr))
-                           (env (cdr left-expr)))
-                        (cons (binop op l r) env))]
-    [(let-expr x e1 e2) (let* ((right-expr (find-dead-vars-env e2 (env-add x false env)))
-                               (e2 (car right-expr))
-                               (env (env-erase x (cdr right-expr)))
-                               (left-expr (find-dead-vars-env e1 env))
-                               (e1 (car left-expr))
-                               (env (cdr left-expr)))
-                            (cons (let-expr x e1 e2) env))]))
-
-(define (find-dead-vars e)
-  (car (find-dead-vars-env e env-empty)))
-
-
-(define (sample2) (find-dead-vars (let-expr 'x (const 3)
-                                      (binop '+ (var-expr 'x)
-                                      (let-expr 'x (const 5) (binop '+ (var-expr 'x) (var-expr 'x)))))))
-
-(define (test1) (find-dead-vars (parse '(let (x 3) (let (x (* x (+ x x))) (+ x x))))))
-(define (test2) (find-dead-vars (parse '(let (x 2) (let [x (let [x (+ x 2)] x)] x)))))
-(define (test3) (find-dead-vars (parse '(let [x 2] (+ (let [x (+ 2 x)] (* 3 x)) x)))))
-(define (test4) (find-dead-vars (parse '(let [x 2] (let [x (+ x 3)] (* x x))))))
-(define (test5) (find-dead-vars (parse '(let [x 2] (+ x (let [x (+ 2 x)] x))))))
-(define (test6) (find-dead-vars (parse '(let [x 2] 
-                                             (let [y (let [x (* x (+ x x))] 
-                                                          (let [y (* x x)] 
-                                                               (+ y 2)))] 
-                                             (+ x (* y y)))))))
-(define (test7) (find-dead-vars (parse '(let [x (let [x (let [x 2] (+ x x))] (+ x x))] (+ x x)))))
-;;; (define (test7) (find-dead-vars (parse '(let [x (let [x (let [x 2] (let (x 2) (+ x x)))] (+ x x))] (+ x x)))))
-(define (test8) (find-dead-vars (parse '(let [x 2] (let [x 2] (+ x x))))))
\ No newline at end of file
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