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aoc-racket/2016/day08/lang.rkt

51 lines
1.6 KiB
Racket

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#lang br/quicklang
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(provide read-syntax)
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(define (read-syntax path port)
(strip-bindings
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#`(module mod "lang.rkt"
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#,@(for/list ([inst (in-lines port)]
#:when (not (equal? inst "")))
(format-datum '(~a) inst)))))
(provide (rename-out [mb #%module-begin]))
(define-macro (mb INST ...)
#'(#%module-begin
(define g (for/fold ([g (grid 50 6)])
([inst (in-list (list INST ...))])
(inst g)))
(for-each displayln (map (λ(gr) (map (λ(gri) (if (= gri 1) "X" " ")) gr)) g))
(apply + (flatten g))))
(require (for-syntax racket/string))
(define-macro (rect ARG)
(with-pattern ([(COLS ROWS) (map string->number (string-split (symbol->string (syntax->datum #'ARG)) "x"))])
#'(curryr fill COLS ROWS)))
(provide rect)
(define-macro (rotate DIR WHICH-RAW by DIST)
(with-pattern ([PROC (prefix-id "shift-" #'DIR)]
[WHICH (string->number (car (string-split (symbol->string (syntax->datum #'WHICH-RAW)) #rx"[xy]=")))])
#'(curryr PROC WHICH DIST)))
(provide rotate)
(define (grid x y)
(make-list y (make-list x 0)))
(define (fill g cols rows)
(for/list ([(row ridx) (in-indexed g)])
(for/list ([(col cidx) (in-indexed (list-ref g ridx))])
(if (and (< ridx rows) (< cidx cols))
1
col))))
(require sugar/list)
(define (shift-row g which dist)
(for/list ([(row ridx) (in-indexed g)])
(if (= which ridx)
(shift row dist #f #t)
row)))
(provide shift-row)
(define (shift-column g which dist)
(apply map list (shift-row (apply map list g) which dist)))
(provide shift-column)