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52 lines
1.6 KiB
Racket
52 lines
1.6 KiB
Racket
8 years ago
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#lang br/quicklang
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(module+ reader (provide read-syntax))
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(define (read-syntax path port)
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(strip-bindings
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#`(module mod "day08.rkt"
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#,@(for/list ([inst (in-lines port)]
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#:when (not (equal? inst "")))
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(format-datum '(~a) inst)))))
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(provide (rename-out [mb #%module-begin]))
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(define-macro (mb INST ...)
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#'(#%module-begin
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(define g (for/fold ([g (grid 50 6)])
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([inst (in-list (list INST ...))])
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(inst g)))
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(for-each displayln (map (λ(gr) (map (λ(gri) (if (= gri 1) "X" " ")) gr)) g))
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(apply + (flatten g))))
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(require (for-syntax racket/string))
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(define-macro (rect ARG)
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(with-pattern ([(COLS ROWS) (map string->number (string-split (symbol->string (syntax->datum #'ARG)) "x"))])
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#'(curryr fill COLS ROWS)))
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(provide rect)
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(define-macro (rotate DIR WHICH-RAW by DIST)
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(with-pattern ([PROC (prefix-id "shift-" #'DIR)]
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[WHICH (string->number (car (string-split (symbol->string (syntax->datum #'WHICH-RAW)) #rx"[xy]=")))])
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#'(curryr PROC WHICH DIST)))
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(provide rotate)
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(define (grid x y)
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(make-list y (make-list x 0)))
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(define (fill g cols rows)
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(for/list ([(row ridx) (in-indexed g)])
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(for/list ([(col cidx) (in-indexed (list-ref g ridx))])
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(if (and (< ridx rows) (< cidx cols))
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1
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col))))
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(require sugar/list)
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(define (shift-row g which dist)
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(for/list ([(row ridx) (in-indexed g)])
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(if (= which ridx)
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(shift row dist #f #t)
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row)))
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(provide shift-row)
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(define (shift-column g which dist)
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(apply map list (shift-row (apply map list g) which dist)))
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(provide shift-column)
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