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49 lines
1.5 KiB
Racket
49 lines
1.5 KiB
Racket
#lang br/quicklang ;; http://adventofcode.com/2016/day/25
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(provide read-syntax
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(rename-out [mb #%module-begin])
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cpy inc dec jnz out)
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(define (read-syntax path port)
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(strip-bindings
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#`(module mod "lang.rkt"
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#,@(for/list ([str (in-lines port)]
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#:when (not (zero? (string-length str))))
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(format-datum '(~a) str)))))
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(define-macro (mb . INSTS)
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#'(#%module-begin
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(define insts (vector . INSTS))
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(define regs (make-hash '((a . 0)(b . 0)(c . 0)(d . 0))))
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(for*/first ([i (in-naturals)]
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#:when
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(begin
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(hash-set! regs 'a i)
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(regexp-match "010101010101" (with-output-to-string (λ () (solve insts regs 50000))))))
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i)))
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(define (solve insts regs max-count)
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(let loop ([ptr 0][count 0])
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(if (or (>= ptr (vector-length insts)) (> count max-count))
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regs
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(loop (+ ptr (let ([move ((vector-ref insts ptr) regs)])
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(if (void? move) 1 move)))
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(add1 count)))))
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(define-macro (cpy X Y)
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#'(λ(regs)
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(define val (if (number? 'X) 'X (hash-ref regs 'X)))
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(hash-set! regs 'Y val)))
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(define-macro (inc X) #'(λ(regs) (hash-update! regs 'X add1)))
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(define-macro (dec X) #'(λ(regs) (hash-update! regs 'X sub1)))
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(define-macro (jnz X Y)
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#'(λ(regs)
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(when (not (zero? (if (number? 'X) 'X (hash-ref regs 'X))))
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Y)))
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(define-macro (out X)
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#'(λ(regs)
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(print (hash-ref regs 'X))))
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