Claudio is an idiot: removed main.rkt (wrote by Claudio actually)
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main.rkt
324
main.rkt
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#lang racket
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; 2018-11-21 - Made by Claudio Maggioni - Tommaso Rodolfo Masera
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; easybf
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(require racket/base
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racket/struct
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test-engine/racket-tests)
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(provide prog-state
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prog-state?
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prog-state-tape
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prog-state-dp
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prog-state-output
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prog-state-program
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prog-state-ip
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execute
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string->program
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program->prog-state)
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; A Byte is an Int between 0 and 255
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; Interpretation: a byte in decimal notation.
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; A Tape is a NEList<Byte>
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; Interpretation: a tape in brainf*ck's Turing machine.
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; A DataPointer (DP) is a NonNegInt
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; Interpretation: a data pointer in the brainf*ck language in a tape.
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; A Program is a String of:
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; - ">" (tape-right)
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; - "<" (tape-left)
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; - "+" (add1)
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; - "-" (sub1)
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; - "." (out)
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; - ","
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; - "[" (loop-start)
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; - "]" (loop-end)
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; Interpretation: the brainf*ck program.
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; A InstructionPointer (IP) is a NonNegInt
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; Interpretation: a pointer to the instruction to execute.
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; A ProgState is a (prog-state tape dp output program ip) where:
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; - tape: Tape
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; - dp: DataPointer
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; - tape-len: Nat
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; - output: String
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; - program: Program
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; - ip: InstructionPointer
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; Interpretation: the current state of execution of a brainf*ck program.
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(struct prog-state (tape dp tape-len output program ip)
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#:transparent
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#:methods gen:custom-write
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[(define write-proc
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(make-constructor-style-printer
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(lambda (w) 'ProgState)
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(lambda (w) (list (prog-state-tape w)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(prog-state-ip w)))))])
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; Template function for ProgState
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#;(define (fn-for-prog-state w)
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#; (... (prog-state-tape w)
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#; (prog-state-dp w)
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#; (prog-state-tape-len w)
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#; (prog-state-output w)
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#; (prog-state-program w)
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#; (prog-state-ip w)))
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; string->program: String -> Program
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; Given a string, returns a bf program without any invalid character
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(define (string->program s)
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(local [; valid-char: Char -> Boolean
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; Given a valid-char, returns #t if the character is a valid bf
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; instruction.
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(define (valid-char? s)
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(ormap (lambda (x) (char=? s x))
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'(#\> #\< #\+ #\- #\, #\. #\[ #\])))]
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(list->string (filter valid-char? (string->list s)))))
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; Tests for string->program
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(check-expect (string->program "hello") "")
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(check-expect (string->program "+ProgState50-[]") "+-[]")
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(check-expect (string->program "") "")
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; add1-byte: Byte -> Byte
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; Given a byte, returns the byte+1 simulating overflows
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(define (add1-byte b)
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(modulo (add1 b) 256))
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; Tests for add1-byte
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(check-expect (add1-byte 255) 0)
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(check-expect (add1-byte 254) 255)
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; sub1-byte: Byte -> Byte
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; Given a byte, returns the byte-1 simulating underflows
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(define (sub1-byte b)
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(cond [(zero? b) 255]
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[else (sub1 b)]))
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; Tests for sub1-byte
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(check-expect (sub1-byte 0) 255)
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(check-expect (sub1-byte 1) 0)
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; program->prog-state: Program -> ProgState
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; Given a program, returns the corresponding initial ProgState state.
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(define (program->prog-state p)
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(prog-state (cons 0 '()) 0 1 "" p 0))
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; Tests for program->prog-state
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(check-expect (program->prog-state "[->+<]") (prog-state (list 0) 0 1 "" "[->+<]" 0))
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; tape-help: Tape DP (Byte -> Byte) -> Tape
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; Given a tape and a data pointer, returns the same tape with the data in the
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; location of the data pointer altered by the function `alter`.
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(define (tape-help tape dp alter)
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(cond [(zero? dp) (cons (alter (first tape)) (rest tape))]
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[else (cons (first tape) (tape-help (rest tape) (sub1 dp) alter))]))
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; Tests for tape-help
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(check-expect (tape-help (list 0) 0 add1-byte) (list 1))
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(check-expect (tape-help (list 0 1 2 3) 2 sub1-byte) (list 0 1 1 3))
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; exec-add1: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the + instruction executed
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(define (exec-add1 w)
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(prog-state (tape-help (prog-state-tape w) (prog-state-dp w) add1-byte)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(add1 (prog-state-ip w))))
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; Tests for exec-add1
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(check-expect (exec-add1 (prog-state
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(list 1 2 3 4 5 6 7) 3 7 "" "+" 0))
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(prog-state (list 1 2 3 5 5 6 7) 3 7 "" "+" 1))
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(check-expect (exec-add1 (prog-state
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(list 255 1 2 3) 0 4 "" "+" 0))
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(prog-state (list 0 1 2 3) 0 4 "" "+" 1))
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; exec-sub1: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the - instruction executed
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(define (exec-sub1 w)
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(prog-state (tape-help (prog-state-tape w) (prog-state-dp w) sub1-byte)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(add1 (prog-state-ip w))))
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; Tests for exec-sub1
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(check-expect (exec-sub1 (prog-state
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(list 1 2 3 4 5 6 7) 3 7 "" "-" 0))
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(prog-state (list 1 2 3 3 5 6 7) 3 7 "" "-" 1))
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(check-expect (exec-sub1 (prog-state
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(list 0 1 2 3) 0 4 "" "-" 0))
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(prog-state (list 255 1 2 3) 0 4 "" "-" 1))
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; exec-tape-left: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the < instruction executed
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(define (exec-tape-left w)
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(if (zero? (prog-state-dp w))
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(error "Can't access negative tape positions")
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(prog-state (prog-state-tape w)
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(sub1 (prog-state-dp w))
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(add1 (prog-state-ip w)))))
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; Tests for exec-tape-left
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(check-error (exec-tape-left (prog-state (list 1 2 3) 0 3 "" "<" 0)))
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(check-expect (exec-tape-left (prog-state (list 1 2 3) 2 3 "" "<" 0))
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(prog-state (list 1 2 3) 1 3 "" "<" 1))
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; exec-tape-right: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the > instruction executed
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(define (exec-tape-right w)
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(local [(define end-of-tape (= (prog-state-dp w) (sub1 (prog-state-tape-len w))))]
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(prog-state
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(if end-of-tape
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(append (prog-state-tape w) (list 0))
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(prog-state-tape w))
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(add1 (prog-state-dp w))
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(if end-of-tape
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(add1 (prog-state-tape-len w))
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(prog-state-tape-len w))
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(prog-state-output w)
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(prog-state-program w)
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(add1 (prog-state-ip w)))))
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; Tests for exec-tape-right
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(check-expect (exec-tape-right (prog-state (list 1 2 3) 0 3 "" ">" 0))
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(prog-state (list 1 2 3) 1 3 "" ">" 1))
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(check-expect (exec-tape-right (prog-state (list 0 1 2) 2 3 "" ">" 0))
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(prog-state (list 0 1 2 0) 3 4 "" ">" 1))
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; exec-out: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the . instruction executed
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(define (exec-out w)
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(prog-state
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(prog-state-tape w)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(string-append
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(prog-state-output w)
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(list->string
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(list (integer->char (list-ref (prog-state-tape w) (prog-state-dp w))))))
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(prog-state-program w)
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(add1 (prog-state-ip w))))
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; Tests for exec-out
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(check-expect (exec-out (prog-state (list 50) 0 1 "" ".[->+<]" 0))
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(prog-state (list 50) 0 1 "2" ".[->+<]" 1))
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(check-expect (exec-out (prog-state (list 65) 0 1 "" ".[->+<]" 0))
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(prog-state (list 65) 0 1 "A" ".[->+<]" 1))
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; char-at: String Nat -> 1String
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; Given a string and an index, returns the 1String at the position pointed by
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; index
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(define (char-at s i)
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(substring s i (add1 i)))
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; Tests for char-at
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(check-expect (char-at "malusa" 2) "l")
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(check-error (char-at "another string" 300))
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; find-first: 1String String Nat (Nat -> Nat) -> Nat
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; Given a 1String `char`, a String `string` and a start index, returns
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; the position of the first occurrence of `char` in `string` starting from the
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; index walking the string changing the index using the `walk` function.
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(define (find-first char string start walk)
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(cond [(string=? (substring string start (add1 start))
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char) start]
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[else (find-first char string (walk start) walk)]))
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; Tests for find-first
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(check-expect (find-first "]" "[++++++---->><-]++++]+--" 0 add1)
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15)
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(check-expect (find-first "]" "[+++++][+---->><-]++++]+--" 7 add1)
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17)
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(check-expect (find-first "[" "[+++++][+---->><-]++++]+--" 17 sub1)
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7)
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; exec-loop-start: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the [ instruction executed
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(define (exec-loop-start w)
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(local [(define jump (zero? (list-ref (prog-state-tape w) (prog-state-dp w))))]
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(prog-state
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(prog-state-tape w)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(add1 (if jump
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(find-first "]" (prog-state-program w) (prog-state-ip w) add1)
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(prog-state-ip w))))))
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; Tests for exec-loop-start
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(check-expect (exec-loop-start
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(prog-state '(0) 0 1 "" "[++--]++--+-[]" 0))
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(prog-state '(0) 0 1 "" "[++--]++--+-[]" 6))
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(check-expect (exec-loop-start
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(prog-state '(1) 0 1 "" "[++--]++--+-[]" 0))
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(prog-state '(1) 0 1 "" "[++--]++--+-[]" 1))
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; exec-loop-end: ProgState -> ProgState
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; Given a ProgState, returns a new ProgState with the ] instruction executed
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(define (exec-loop-end w)
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(local [(define jump (not (zero? (list-ref (prog-state-tape w) (prog-state-dp w)))))]
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(prog-state
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(prog-state-tape w)
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(prog-state-dp w)
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(prog-state-tape-len w)
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(prog-state-output w)
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(prog-state-program w)
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(add1 (if jump
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(find-first "[" (prog-state-program w) (prog-state-ip w) sub1)
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(prog-state-ip w))))))
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; Tests for exec-loop-end
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(check-expect (exec-loop-end
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(prog-state '(0) 0 1 "" "[++--]++--+-[]" 5))
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(prog-state '(0) 0 1 "" "[++--]++--+-[]" 6))
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(check-expect (exec-loop-end
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(prog-state '(1) 0 1 "" "[++--]++--+-[]" 5))
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(prog-state '(1) 0 1 "" "[++--]++--+-[]" 1))
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; execute: ProgState -> ProgState
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; Given an initial ProgState state, returns the final ProgState state executing the
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; program.
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(define (execute w)
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(local [(define program-len (string-length (prog-state-program w)))]
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(cond [(>= (prog-state-ip w) program-len) w]
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[else
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(local [(define inst
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(char-at (prog-state-program w) (prog-state-ip w)))]
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(execute (cond [(string=? inst "+") (exec-add1 w)]
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[(string=? inst "-") (exec-sub1 w)]
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[(string=? inst "<") (exec-tape-left w)]
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[(string=? inst ">") (exec-tape-right w)]
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[(string=? inst "[") (exec-loop-start w)]
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[(string=? inst "]") (exec-loop-end w)]
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[(string=? inst ".") (exec-out w)]
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[(string=? inst ",") #f])))])))
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; Tests for execute
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(check-expect (execute (prog-state (list 0) 0 3 "" "" 0))
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(prog-state (list 0) 0 3 "" "" 0))
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; assert that 5+2 to ASCII = "7" (WTF)
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(check-expect (execute (prog-state (list 0) 0 1 ""
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"++>+++++[<+>-]++++++++[<++++++>-]<." 0))
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(prog-state (list 55 0) 0 2 "7"
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"++>+++++[<+>-]++++++++[<++++++>-]<." 35))
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; Run tests
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(test)
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; TODO: fix matching bracket bug
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