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31 lines
1.3 KiB
Racket
31 lines
1.3 KiB
Racket
#lang reader "../aoc-lang.rkt"
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(provide (rename-out [#%mb #%module-begin]) ★ ★★)
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(define-macro (#%mb (STARS) TOKS ...)
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#`(#%module-begin
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(time (STARS (vector (λ () TOKS) ...)))))
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(define regs (make-hasheq))
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(define last-sound-played (make-parameter #f))
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(struct offset-signal (val))
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(struct end-signal (val))
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(provide snd set add mul mod rcv jgz)
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(define-macro (value VAL) #'(let ([val 'VAL]) (if (number? val) val (hash-ref regs val))))
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(define-macro (snd REG) #'(last-sound-played (hash-ref regs 'REG)))
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(define-macro (set REG VAL) #'(hash-set! regs 'REG (value VAL)))
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(define-macro (add REG VAL) #'(hash-update! regs 'REG (λ (val) (+ val (value VAL))) 0))
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(define-macro (mul REG VAL) #'(hash-update! regs 'REG (λ (val) (* val (value VAL))) 0))
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(define-macro (mod REG VAL) #'(hash-update! regs 'REG (λ (val) (modulo val (value VAL))) 0))
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(define-macro (rcv REG) #'(unless (zero? (hash-ref regs 'REG)) (raise (last-sound-played))))
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(define-macro (jgz REG VAL) #'(when (positive? (hash-ref regs 'REG)) (raise (offset-signal (value VAL)))))
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(define (★ insts)
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(with-handlers ([number? values])
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(for/fold ([offset 0])
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([i (in-naturals)])
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(with-handlers ([offset-signal? (λ (os) (+ (offset-signal-val os) offset))])
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(define proc (vector-ref insts offset))
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(proc)
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(add1 offset)))))
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