diff options
Diffstat (limited to 'stlc-rec.rkt')
| -rw-r--r-- | stlc-rec.rkt | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/stlc-rec.rkt b/stlc-rec.rkt index 24bbb8f..97ee9a3 100644 --- a/stlc-rec.rkt +++ b/stlc-rec.rkt @@ -12,22 +12,22 @@ ; Γ ⊢ unfold [μx.t] e: [x ↦ μx.t] t ;; (interpret Expr Table[Sym, Expr]): Value -(define (interpret expr [ctx #hash()]) - (interpret- (strip (desugar expr)) ctx)) -(define (interpret- expr ctx) +(define (interpret expr [Γ #hash()]) + (interpret- (strip (desugar expr)) Γ)) +(define (interpret- expr Γ) (match expr ['sole 'sole] [n #:when (natural? n) n] - [x #:when (dict-has-key? ctx x) (dict-ref ctx x)] + [x #:when (dict-has-key? Γ x) (dict-ref Γ x)] [`(fold ,t ,e) `(fold ,t ,(interpret- e))] [`(unfold ,t ,e) `(unfold ,t ,(interpret- e))] - [`(λ ,x ,e) `(λ ,x ,e ,ctx)] + [`(λ ,x ,e) `(λ ,x ,e ,Γ)] [`(,e1 ,e2) - (match (interpret- e1 ctx) + (match (interpret- e1 Γ) [`(λ ,x ,e ,env) - (interpret- e (dict-set env x (interpret- e2 ctx)))] + (interpret- e (dict-set env x (interpret- e2 Γ)))] [e (err (format "applying arg ~a to unknown expression ~a" e2 e))])] [e (err (format "interpreting an unknown expression ~a" e))])) |