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Finite state machine: Difference between revisions
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put python in the correct alphabetic order
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true .
</pre>
=={{header|Racket}}==▼
<lang racket>#lang racket▼
(define states▼
'((ready (deposit . waiting)▼
(quit . exit))▼
(waiting (select . dispense)▼
(refund . refunding))▼
(dispense (remove . ready))▼
(refunding . ready)))▼
(define (machine states prompt get-action quit)▼
(let recur ((state (caar states)))▼
(printf "CURRENT STATE: ~a~%" state)▼
(if (eq? state 'exit)▼
(quit)▼
(recur (match (cdr (assoc state states))▼
[(list (and transitions (cons actions _)) ...)▼
(prompt "next action (from: ~a): " actions)▼
(match (assoc (get-action) transitions)▼
[(cons action new-state)▼
(printf "~a -> ~a -> ~a~%" state action new-state)▼
new-state]▼
[#f (printf "invalid action for~%") state])]▼
[auto-state▼
(printf "~a -> ~a~%" state auto-state)▼
auto-state])))))▼
(module+ main▼
(let/ec quit▼
(with-input-from-string "deposit select remove deposit refund quit"▼
(λ () (machine states void read quit)))))</lang>▼
{{out}}▼
<pre>CURRENT STATE: ready▼
ready -> deposit -> waiting▼
CURRENT STATE: waiting▼
waiting -> select -> dispense▼
CURRENT STATE: dispense▼
dispense -> remove -> ready▼
CURRENT STATE: ready▼
ready -> deposit -> waiting▼
CURRENT STATE: waiting▼
waiting -> refund -> refunding▼
CURRENT STATE: refunding▼
refunding -> ready▼
CURRENT STATE: ready▼
ready -> quit -> exit▼
CURRENT STATE: exit</pre>▼
=={{header|Python}}==
{{works with|Python 3}}
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PS C:\alan\programming>
</pre>
▲=={{header|Racket}}==
▲<lang racket>#lang racket
▲(define states
▲ '((ready (deposit . waiting)
▲ (quit . exit))
▲ (waiting (select . dispense)
▲ (refund . refunding))
▲ (dispense (remove . ready))
▲ (refunding . ready)))
▲(define (machine states prompt get-action quit)
▲ (let recur ((state (caar states)))
▲ (printf "CURRENT STATE: ~a~%" state)
▲ (if (eq? state 'exit)
▲ (quit)
▲ (recur (match (cdr (assoc state states))
▲ [(list (and transitions (cons actions _)) ...)
▲ (prompt "next action (from: ~a): " actions)
▲ (match (assoc (get-action) transitions)
▲ [(cons action new-state)
▲ (printf "~a -> ~a -> ~a~%" state action new-state)
▲ new-state]
▲ [#f (printf "invalid action for~%") state])]
▲ [auto-state
▲ (printf "~a -> ~a~%" state auto-state)
▲ auto-state])))))
▲(module+ main
▲ (let/ec quit
▲ (with-input-from-string "deposit select remove deposit refund quit"
▲ (λ () (machine states void read quit)))))</lang>
▲{{out}}
▲<pre>CURRENT STATE: ready
▲ready -> deposit -> waiting
▲CURRENT STATE: waiting
▲waiting -> select -> dispense
▲CURRENT STATE: dispense
▲dispense -> remove -> ready
▲CURRENT STATE: ready
▲ready -> deposit -> waiting
▲CURRENT STATE: waiting
▲waiting -> refund -> refunding
▲CURRENT STATE: refunding
▲refunding -> ready
▲CURRENT STATE: ready
▲ready -> quit -> exit
▲CURRENT STATE: exit</pre>
=={{header|Raku}}==
(formerly Perl 6)
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