38 lines
959 B
Plaintext
38 lines
959 B
Plaintext
(fork-server 'stack (lambda ()
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(let this ((me '()))
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(let*((envelope (wait-mail))
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(sender msg envelope))
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(case msg
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(['empty]
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(mail sender (null? me))
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(this me))
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(['push value]
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(this (cons value me)))
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(['pop]
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(cond
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((null? me)
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(mail sender #false)
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(this me))
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(else
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(mail sender (car me))
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(this (cdr me))))))))))
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(define (push value)
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(mail 'stack ['push value]))
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(define (pop)
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(interact 'stack ['pop]))
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(define (empty)
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(interact 'stack ['empty]))
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(for-each (lambda (n)
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(print "pushing " n)
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(push n))
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(iota 5 1)) ; '(1 2 3 4 5)
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(let loop ()
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(print "is stack empty: " (empty))
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(unless (empty)
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(begin
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(print "popping value, got " (pop))
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(loop))))
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(print "done.")
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