You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.1 KiB
Racket
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)
|