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.
26 lines
786 B
Racket
26 lines
786 B
Racket
#lang sugar/debug br/quicklang
|
|
(require "../helper.rkt")
|
|
|
|
(provide read-syntax)
|
|
(define (read-syntax path port)
|
|
(strip-context #`(module mod "main.rkt"
|
|
#,@(for/list ([datum (in-port read port)])
|
|
datum))))
|
|
|
|
(provide (rename-out [#%mb #%module-begin]))
|
|
(define-macro (#%mb STARS JMP ...)
|
|
#'(#%module-begin (escape 'STARS (list->vector '(JMP ...)))))
|
|
|
|
(define (escape stars vec)
|
|
(let/ec exit
|
|
(for/fold ([pos 0])
|
|
([i (in-naturals)])
|
|
(unless (<= 0 pos (sub1 (vector-length vec)))
|
|
(exit i))
|
|
(define jmp (vector-ref vec pos))
|
|
(vector-set! vec pos (if (and (eq? stars '★★) (>= jmp 3))
|
|
(sub1 jmp)
|
|
(add1 jmp)))
|
|
(+ pos jmp))))
|
|
|