Day 5
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#lang racket
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;; First some helpers
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(define (op-mode opcode idx)
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(match (modulo (floor (/ opcode (expt 10 (+ idx 2)))) 10)
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[0 'pos]
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[1 'imm]
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[_ (error "invalid mode")]))
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(define (op-op opcode)
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(modulo opcode 100))
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(define (tape-ref/mode tape pos mode)
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(match mode
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['pos (list-ref tape (list-ref tape pos))]
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['imm (list-ref tape pos)]
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[_ (error "invalid mode")]))
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;; Generic abstracted opcode interpreter function
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;; Calls handler for opcode-specific handling, which should call callback to continue or return to
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;; exit.
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(define (intcode-handle-opcode callback spec handler tape pos)
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(let* ([opcode (list-ref tape pos)]
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[args (for/list ([spec-item spec] [idx (in-range (length spec))])
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(tape-ref/mode tape (+ pos idx 1)
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(match spec-item
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['in (op-mode opcode idx)]
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['out 'imm])))])
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(apply handler callback tape (+ pos (length spec) 1) args)))
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;; Create a system to register intcode ops
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(struct intcode-op [code spec handler])
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(define opcode-table (make-hash))
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;; Evil mutation incoming!!!!
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(define (intcode-register code spec handler)
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(hash-set! opcode-table code (intcode-op code spec handler)))
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;; Main eval function
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(define (intcode-eval tape [pos 0])
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(let* ([opcode (list-ref tape pos)]
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[handler-entry (hash-ref opcode-table (op-op opcode))])
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(intcode-handle-opcode intcode-eval
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(intcode-op-spec handler-entry)
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(intcode-op-handler handler-entry)
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tape pos)))
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;; Now it's time to define all the operations we can do
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;; Binary operations!!!
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(define spec-binop '(in in out))
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(define ((intcode-generic-binop op) cb tape pos lhs rhs dst)
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(cb (list-set tape dst (op lhs rhs)) pos))
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(intcode-register 1 spec-binop (intcode-generic-binop +))
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(intcode-register 2 spec-binop (intcode-generic-binop *))
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(define (bool->number b) (if b 1 0))
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(intcode-register 7 spec-binop (intcode-generic-binop (compose bool->number <)))
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(intcode-register 8 spec-binop (intcode-generic-binop (compose bool->number =)))
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;; Exit
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(define (intcode-exit cb tape pos) (void))
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(intcode-register 99 '() intcode-exit)
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;; I/O time
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(define (intcode-input cb tape pos dst)
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(cb (list-set tape dst (read)) pos))
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(intcode-register 3 '(out) intcode-input)
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(define (intcode-output cb tape pos src)
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(displayln src)
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(cb tape pos))
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(intcode-register 4 '(in) intcode-output)
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;; Jumps
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(define ((intcode-generic-jump which) cb tape pos arg dst)
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(cb tape (if (which arg) dst pos)))
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(intcode-register 5 '(in in) (intcode-generic-jump (compose not zero?)))
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(intcode-register 6 '(in in) (intcode-generic-jump zero?))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define input (map string->number (string-split (string-trim (file->string "input.5.txt")) ",")))
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(intcode-eval input)
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