51 lines
1.3 KiB
Factor
51 lines
1.3 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: io.encodings io.backend io.ports io.streams.duplex
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io splitting sequences sequences.lib namespaces kernel
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destructors math concurrency.combinators accessors
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arrays continuations quotations ;
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IN: io.pipes
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TUPLE: pipe in out ;
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M: pipe dispose ( pipe -- )
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[ in>> dispose ] [ out>> dispose ] bi ;
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HOOK: (pipe) io-backend ( -- pipe )
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: <pipe> ( encoding -- stream )
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[
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>r (pipe) |dispose
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[ in>> <input-port> ] [ out>> <output-port> ] bi
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r> <encoder-duplex>
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] with-destructors ;
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<PRIVATE
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: ?reader [ <input-port> &dispose ] [ input-stream get ] if* ;
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: ?writer [ <output-port> &dispose ] [ output-stream get ] if* ;
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GENERIC: run-pipeline-element ( input-fd output-fd obj -- quot )
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M: callable run-pipeline-element
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[
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>r [ ?reader ] [ ?writer ] bi*
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r> with-streams*
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] with-destructors ;
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: <pipes> ( n -- pipes )
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[
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[ (pipe) |dispose ] replicate
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T{ pipe } [ prefix ] [ suffix ] bi
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2 <clumps>
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] with-destructors ;
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PRIVATE>
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: run-pipeline ( seq -- results )
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[ length dup zero? [ drop { } ] [ 1- <pipes> ] if ] keep
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[
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>r [ first in>> ] [ second out>> ] bi
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r> run-pipeline-element
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] 2parallel-map ;
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