minischeme:用Haskell编写的迷你计划口译员

迷你计划 用Haskell编写的迷你计划口译员 迷你计划规范 Mini-Scheme是编程语言Scheme的子集 句法 Toplevel ::= Exp | Define | (load String) Define ::= (define Id Exp) | (define (Id Id* [. Id]) Body) Exp ::= Const | Id | (lambda Arg Body) | (Exp Exp*) | (quote S-Exp) | (set! Id Exp) | (let [Id] Bindings Body) | (let* [Id] Bindings Body) | (letrec [Id] Bindings Body) | (if Exp Exp [Exp])