diff options
Diffstat (limited to 'Semestr 2/racket/l13/solution.rkt')
| -rw-r--r-- | Semestr 2/racket/l13/solution.rkt | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/Semestr 2/racket/l13/solution.rkt b/Semestr 2/racket/l13/solution.rkt deleted file mode 100644 index 61804b3..0000000 --- a/Semestr 2/racket/l13/solution.rkt +++ /dev/null @@ -1,124 +0,0 @@ -#lang typed/racket
-
-; --------- ;
-; Wyrazenia ;
-; --------- ;
-
-(provide parse typecheck)
-
-(define-type Expr (U const binop var-expr let-expr if-expr))
-(define-type Value (U Real Boolean))
-(define-type ArithOp (U '+ '- '/ '* '%))
-;;; (define-type ModOp '%)
-(define-type CompOp (U '= '> '>= '< '<=))
-(define-type LogicOp (U 'and 'or))
-(define-type BinopSym (U ArithOp CompOp LogicOp))
-
-(struct const ([val : Value]) #:transparent)
-(struct binop ([op : BinopSym] [l : Expr] [r : Expr]) #:transparent)
-(struct var-expr ([id : Symbol]) #:transparent)
-(struct let-expr ([id : Symbol] [e1 : Expr] [e2 : Expr]) #:transparent)
-(struct if-expr ([eb : Expr] [et : Expr] [ef : Expr]) #:transparent)
-
-(define-predicate expr? Expr)
-(define-predicate value? Value)
-(define-predicate arith-op? ArithOp)
-;;; (define-predicate mod-op? ModOp)
-(define-predicate comp-op? CompOp)
-(define-predicate logic-op? LogicOp)
-(define-predicate binop-sym? BinopSym)
-(define-predicate let-list? (List Symbol Any))
-
-(: parse (-> Any Expr))
-(define (parse q)
- (match q
- [_ #:when (value? q) (const q)]
- [_ #:when (eq? q 'true) (const true)]
- [_ #:when (eq? q 'false) (const false)] ; <---------------------------- !!!
- [_ #:when (symbol? q) (var-expr q)]
- [`(,s ,e1 ,e2)
- #:when (and (eq? s 'let) (let-list? e1))
- (let-expr (car e1)
- (parse (cadr e1))
- (parse e2))]
- [`(,s ,eb ,et ,ef)
- #:when (eq? s 'if)
- (if-expr (parse eb)
- (parse et)
- (parse ef))]
- [`(,s ,e1 ,e2)
- #:when (binop-sym? s)
- (binop s
- (parse e1)
- (parse e2))]
- [else (error "Parse error" q)]))
-
-; ---------- ;
-; Srodowiska ;
-; ---------- ;
-
-(define-type EType (U 'real 'boolean))
-(define-predicate EType? EType)
-
-(struct environ ([xs : (Listof (Pairof Symbol EType))]))
-(define env-empty (environ null))
-
-(: env-add (-> Symbol EType environ environ))
-(define (env-add x v env)
- (environ (cons (cons x v) (environ-xs env))))
-
-(: env-lookup (-> Symbol environ EType))
-(define (env-lookup x env)
- (: assoc-lookup (-> (Listof (Pairof Symbol EType)) EType))
- (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)))
-
-(: check-op (-> Expr Expr EType EType environ (U EType #f)))
-(define (check-op e1 e2 arg-type ret-type env)
- (if (and (eq? (typecheck-env e1 env) arg-type)
- (eq? (typecheck-env e2 env) arg-type))
- ret-type
- #f))
-
-(: typecheck-env (-> Expr environ (U EType #f)))
-(define (typecheck-env e env)
- (match e
- [(const val)
- (cond
- [(real? val) 'real]
- [(boolean? val) 'boolean])]
- [(var-expr id) (env-lookup id env)]
- [(binop op e1 e2)
- (cond
- [(arith-op? op) (check-op e1 e2 'real 'real env)]
- [(comp-op? op) (check-op e1 e2 'real 'boolean env)]
- [(logic-op? op) (check-op e1 e2 'boolean 'boolean env)])]
- [(let-expr id e1 e2)
- (let ((id-type (typecheck-env e1 env)))
- (if id-type
- (typecheck-env e2 (env-add id id-type env))
- #f))]
- [(if-expr eb et ef)
- (let ((eb-type (typecheck-env eb env)))
- (if (not (eq? eb-type 'boolean))
- #f
- (let ((et-type (typecheck-env et env))
- (ef-type (typecheck-env ef env)))
- (if (eq? et-type ef-type) ;;; nie trzeba sprawdzac czy ktores z nich to #f
- et-type ;;; jesli tak jest, to i tak sie na pewno zwroci #f
- #f))))]))
-
-(: typecheck (-> Expr (U EType #f)))
-(define (typecheck e)
- (typecheck-env e env-empty))
-
-(define program
- '(if (or (< (% 123 10) 5)
- true)
- (+ 2 3)
- (/ 2 0)))
-
-(define (test-eval) (eval (parse program)))
\ No newline at end of file |