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beautiful-racket/br/ex/simples/stack/stacker/stacker-lang.rkt

35 lines
1.1 KiB
Racket

9 years ago
#lang br
(define (read-syntax src-path src-port)
(define src-strs (port->lines src-port))
(define (make-datum str) (format-datum '(dispatch ~a) str))
(define src-exprs (map make-datum src-strs))
(inject-syntax ([#'(list src-expr ...) src-exprs])
#'(module stacker-mod "stacker-lang.rkt"
src-expr ...)))
(provide read-syntax)
(define #'(stacker-module-begin reader-line ...)
#'(#%module-begin
reader-line ...
(display (first stack))))
(provide (rename-out [stacker-module-begin #%module-begin]))
(define stack (list 0 0))
(define (push num) (set! stack (cons num stack)))
(define (dispatch arg-1 [arg-2 #f])
(cond
[(number? arg-2) (push arg-2)]
[else
(define op arg-1)
(define op-result (op (first stack) (second stack)))
(set! stack (cons op-result (drop stack 2)))]))
#;(define dispatch
(case-lambda
[(push num) (push num)]
[(stack-op)
(define op-result (stack-op (first stack) (second stack)))
(set! stack (cons op-result (drop stack 2)))]))
(provide #%top-interaction)