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implemented input function

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This commit is contained in:
Tommaso Rodolfo Masera 2018-12-04 10:02:47 +01:00
parent 45ba1c924a
commit 801ce49212
1 changed files with 31 additions and 11 deletions
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42
interpreter.rkt
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@ -112,7 +112,8 @@
(prog-state (cons 0 '()) 0 1 "" p 0))
; Tests for program->prog-state
(check-expect (program->prog-state "[->+<]") (prog-state (list 0) 0 1 "" "[->+<]" 0))
(check-expect
(program->prog-state "[->+<]") (prog-state (list 0) 0 1 "" "[->+<]" 0))
; tape-help: Tape DP (Byte -> Byte) -> Tape
; Given a tape and a data pointer, returns the same tape with the data in the
@ -177,15 +178,16 @@
(check-error (exec-tape-left (prog-state (list 1 2 3) 0 3 "" "<" 0)))
(check-expect (exec-tape-left (prog-state (list 1 2 3) 2 3 "" "<" 0))
(prog-state (list 1 2 3) 1 3 "" "<" 1))
; exec-tape-right: ProgState -> ProgState
; Given a ProgState, returns a new ProgState with the > instruction executed
(define (exec-tape-right w)
(local [(define end-of-tape (= (prog-state-dp w) (sub1 (prog-state-tape-len w))))]
(local [(define end-of-tape
(= (prog-state-dp w) (sub1 (prog-state-tape-len w))))]
(prog-state
(if end-of-tape
(append (prog-state-tape w) (list 0))
(prog-state-tape w))
(prog-state-tape w))
(add1 (prog-state-dp w))
(if end-of-tape
(add1 (prog-state-tape-len w))
@ -243,7 +245,7 @@
(define brkt (if (symbol=? wd 'forward) #\] #\[))
(define oppos-brkt (if (symbol=? wd 'forward) #\[ #\]))
(define upd-start (if (symbol=? wd 'forward) add1 sub1))
; fm-helper Nat Nat -> Nat
; Given a starting position and a nest accumulator, returns the position of
; the matching bracket waking in the direction provided by updating the
@ -272,7 +274,8 @@
; exec-loop-start: ProgState -> ProgState
; Given a ProgState, returns a new ProgState with the [ instruction executed
(define (exec-loop-start w)
(local [(define jump (zero? (list-ref (prog-state-tape w) (prog-state-dp w))))]
(local [(define jump
(zero? (list-ref (prog-state-tape w) (prog-state-dp w))))]
(prog-state
(prog-state-tape w)
(prog-state-dp w)
@ -280,7 +283,7 @@
(prog-state-output w)
(prog-state-program w)
(add1 (if jump
(find-matching (prog-state-program w) (prog-state-ip w) 'forward)
(find-matching (prog-state-program w) (prog-state-ip w) 'forward)
(prog-state-ip w))))))
; Tests for exec-loop-start
@ -294,7 +297,8 @@
; exec-loop-end: ProgState -> ProgState
; Given a ProgState, returns a new ProgState with the ] instruction executed
(define (exec-loop-end w)
(local [(define jump (not (zero? (list-ref (prog-state-tape w) (prog-state-dp w)))))]
(local [(define jump
(not (zero? (list-ref (prog-state-tape w) (prog-state-dp w)))))]
(prog-state
(prog-state-tape w)
(prog-state-dp w)
@ -302,7 +306,7 @@
(prog-state-output w)
(prog-state-program w)
(add1 (if jump
(find-matching (prog-state-program w) (prog-state-ip w) 'backward)
(find-matching (prog-state-program w) (prog-state-ip w) 'backward)
(prog-state-ip w))))))
; Tests for exec-loop-end
@ -313,9 +317,25 @@
(prog-state '(1) 0 1 "" "[++--]++--+-[]" 5))
(prog-state '(1) 0 1 "" "[++--]++--+-[]" 1))
; exec-in: ProgState ((Byte -> _) -> _) (ProgState -> _) -> _
; Given a ProgState, a function that takes a callback function requiring a Byte
; and a function which takes the new ProgState, calls done with the input
; provided by get-input (provided by the call to the callback given in
; get-input).
(define (exec-in w get-input done)
(define (got-input byte)
(done (prog-state
(insert-in-tape byte (prog-state-dp w))
(prog-state-dp w)
(prog-state-tape-len w)
(prog-state-output w)
(prog-state-program w)
(add1 (prog-state-ip w)))))
(get-input got-input))
; execute: ProgState -> ProgState
; Given an initial ProgState state, returns the final ProgState state executing the
; program.
; Given an initial ProgState state,
; returns the final ProgState state executing the program.
(define (execute w)
(local [(define program-len (string-length (prog-state-program w)))]
(cond [(>= (prog-state-ip w) program-len) w]