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beautiful-racket/beautiful-racket-demo/funstacker-h2.rkt

33 lines
1.0 KiB
Racket

#lang br/quicklang
(define (read-syntax path port)
(define args (port->lines port))
(define arg-datums (filter-not void? (format-datums '~a args)))
(define module-datum `(module stacker-mod br/demo/funstacker
(nestify null ,@arg-datums)))
(datum->syntax #f module-datum))
(provide read-syntax)
(define-macro (stacker-module-begin HANDLE-ARGS-EXPR)
#'(#%module-begin
(display (first HANDLE-ARGS-EXPR))))
(provide (rename-out [stacker-module-begin #%module-begin]))
(require (for-syntax sugar/debug))
(define-macro-cases nestify
[(nestify ARG0) #'ARG0]
[(nestify ARG0 ARG1 ARG ...) #'(nestify (h3 ARG0 ARG1) ARG ...)])
(provide nestify)
(define (h3 stack arg)
(cond
[(number? arg) (cons arg stack)]
[(or (equal? * arg) (equal? + arg))
(define op-result (arg (first stack) (second stack)))
(cons op-result (drop stack 2))]))
(provide + * null)
(module+ test
(require rackunit)
#;(check-equal? (with-output-to-string (λ () (dynamic-require "funstacker-test.rkt" #f))) "36"))