52 lines
1.7 KiB
Racket
52 lines
1.7 KiB
Racket
#lang typed/racket/base
|
|
(require "lexical-structs.rkt")
|
|
|
|
(provide (all-defined-out))
|
|
|
|
;; Expressions
|
|
|
|
(define-type ExpressionCore (U Top Constant Var Branch Def Lam Seq App #;Letrec
|
|
Let1))
|
|
|
|
(define-struct: Top ([prefix : Prefix]
|
|
[code : ExpressionCore]) #:transparent)
|
|
(define-struct: Constant ([v : Any]) #:transparent)
|
|
(define-struct: Var ([id : Symbol]) #:transparent)
|
|
(define-struct: Branch ([predicate : ExpressionCore]
|
|
[consequent : ExpressionCore]
|
|
[alternative : ExpressionCore]) #:transparent)
|
|
(define-struct: Def ([variable : Symbol]
|
|
[value : ExpressionCore]) #:transparent)
|
|
(define-struct: Lam ([parameters : (Listof Symbol)]
|
|
[body : ExpressionCore]) #:transparent)
|
|
(define-struct: Seq ([actions : (Listof ExpressionCore)]) #:transparent)
|
|
(define-struct: App ([operator : ExpressionCore]
|
|
[operands : (Listof ExpressionCore)]) #:transparent)
|
|
|
|
(define-struct: Let1 ([name : Symbol]
|
|
[rhs : ExpressionCore ]
|
|
[body : ExpressionCore])
|
|
#:transparent)
|
|
|
|
|
|
#;(define-struct: Letrec ([names : (Listof Symbol)]
|
|
[procs : (Listof Lam)]
|
|
[body : ExpressionCore]))
|
|
|
|
(: last-exp? ((Listof Expression) -> Boolean))
|
|
(define (last-exp? seq)
|
|
(null? (cdr seq)))
|
|
|
|
(: first-exp ((Listof Expression) -> Expression))
|
|
(define (first-exp seq) (car seq))
|
|
|
|
(: rest-exps ((Listof Expression) -> (Listof Expression)))
|
|
(define (rest-exps seq) (cdr seq))
|
|
|
|
|
|
|
|
|
|
(define-struct: Assign ([variable : Symbol]
|
|
[value : Expression]) #:transparent)
|
|
(define-type Expression (U ExpressionCore #;Assign))
|