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44 lines
1.7 KiB
Racket
44 lines
1.7 KiB
Racket
#lang br/quicklang
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(require "../helper.rkt" racket/sequence)
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(provide read-syntax (rename-out [#%mb #%module-begin]))
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(define (read-syntax path port)
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(define lines (port->lines port))
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(strip-context #`(module mod "main.rkt"
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#,@(for/list ([datum (in-port read (open-input-string (car lines)))])
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datum)
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#,@(cdr lines))))
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(define vec #f)
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(define (set-knot-range! int) (set! vec (list->vector (range int))))
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(define-macro (#%mb STARS RANGE STR)
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#`(#%module-begin
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(set-knot-range! RANGE)
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((if (eq? 'STARS '★) one-star two-star) STR)))
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(define (one-star str)
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(define lens (for/list ([len (in-port read (open-input-string (string-replace str "," " ")))])
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len))
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(reverse-segments lens)
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(* (vector-ref vec 0) (vector-ref vec 1)))
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(define (two-star str)
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(define ascii-chars (map char->integer (string->list str)))
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(reverse-segments (append ascii-chars '(17 31 73 47 23)) #:count 64)
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(define dense-hash (for/list ([vals (in-slice 16 (vector->list vec))])
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(apply bitwise-xor vals)))
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(string-append* (for/list ([num (in-list dense-hash)])
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(~r num #:base 16 #:min-width 2 #:pad-string "0"))))
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(define (reverse-segments lens #:count [count 1])
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(for*/fold ([current-position 0]
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[skip-size 0])
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([i (in-range count)]
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[len (in-list lens)])
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(define posns (for/list ([i (in-range len)])
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(modulo (+ current-position i) (vector-length vec))))
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(for ([val (in-list (map (curry vector-ref vec) posns))]
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[posn (in-list (reverse posns))])
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(vector-set! vec posn val))
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(values (+ current-position len skip-size) (add1 skip-size)))) |