Created
August 5, 2011 22:24
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STLC with define-judgment-form
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#lang racket | |
(require redex/pict | |
redex/reduction-semantics) | |
; | |
; | |
; | |
; ;;;; ;; ; ; ; | |
; ; ; ; ; ; ; ; | |
; ; ; ; ; | |
; ; ; ;;; ;;; ; ;;;; ; ;;; ; ;;; ;;;; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ; ;;;;; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ;;;; ;;; ; ; ; ; ; ;; ; ;;; ; ; | |
; | |
; | |
; | |
(define-language STLC | |
(e (λ (x τ) e) | |
(e e) | |
x | |
integer | |
add1) | |
(τ int | |
(τ → τ)) | |
(Γ ([x τ] ...)) | |
(x variable-not-otherwise-mentioned)) | |
(define-judgment-form STLC | |
mode : I I O | |
typeof ⊆ Γ × e × τ | |
[(typeof Γ (λ (x τ_1) e) (τ_1 → τ_2)) | |
(typeof (extend Γ x τ_1) e τ_2)] | |
[(typeof Γ (e_1 e_2) τ) | |
(typeof Γ e_1 (τ_2 → τ)) | |
(typeof Γ e_2 τ_2)] | |
[(typeof Γ x τ) | |
(where τ (lookup Γ x))] | |
[(typeof Γ integer int)] | |
[(typeof Γ add1 (int → int))]) | |
(define-metafunction STLC | |
extend : Γ x τ -> Γ | |
[(extend ([x_0 τ_0] ... [x_i τ_i] [x_i+1 τ_i+1] ...) x_i τ) | |
([x_0 τ_0] ... [x_i τ] [x_i+1 τ_i+1] ...)] | |
[(extend ([x_1 τ_1] ...) x_0 τ_0) | |
([x_0 τ_0] [x_1 τ_1] ...)]) | |
(define-metafunction STLC | |
lookup : Γ x -> τ | |
[(lookup ([x_0 τ_0] ... [x_i τ_i] [x_i+1 τ_i+1] ...) x_i) τ_i]) | |
(test-equal (judgment-holds (typeof () (λ (x int) (λ (x (int → int)) (x (add1 7)))) τ) τ) | |
(list (term (int → ((int → int) → int))))) | |
(test-equal (judgment-holds (typeof () (λ (x int) (λ (x (int → int)) (add1 x))) τ)) | |
false) | |
; | |
; | |
; | |
; ;;;;; ; | |
; ; ; ; ; | |
; ; ; ; | |
; ; ; ; ;;;; ;;; ;;; ;;; ;;; ;;; ; ;;;; ;;;; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ; ; ; ; ;;;;; ;;; ;;;;; ; ; ; ; ; ; ; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; | |
; ; ;;;; ;;;; ;;; ;;; ;;; ;; ;; ; ; ; ;;;; | |
; ; ; ; | |
; ; ; ; ; ; | |
; ;;; ;;; | |
(define (rewrite-typeof lws) | |
(list "" (list-ref lws 2) " ⊢ " (list-ref lws 3) " : " (list-ref lws 4))) | |
(define (rewrite-extend lws) | |
(list "" (list-ref lws 2) ", " (list-ref lws 3) ":" (list-ref lws 4))) | |
(define (rewrite-lookup lws) | |
(list "" (list-ref lws 2) "(" (list-ref lws 3) ")")) | |
(with-compound-rewriter | |
'typeof rewrite-typeof | |
(with-compound-rewriter | |
'extend rewrite-extend | |
(with-compound-rewriter | |
'lookup rewrite-lookup | |
(with-atomic-rewriter | |
'integer "Z" (render-judgment-form typeof))))) |
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