37 lines
882 B
Factor
37 lines
882 B
Factor
! Copyright (C) 2006, 2007 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: assocs kernel namespaces sequences ;
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IN: graphs
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SYMBOL: graph
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: if-graph ( vertex edges graph quot -- )
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over
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[ graph swap with-variable ]
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[ 2drop 2drop ] if ; inline
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: nest ( key -- hash )
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graph get [ drop H{ } clone ] cache ;
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: add-vertex ( vertex edges graph -- )
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[ [ dupd nest set-at ] with each ] if-graph ; inline
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: remove-vertex ( vertex edges graph -- )
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[ [ graph get at delete-at ] with each ] if-graph ; inline
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SYMBOL: previous
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: (closure) ( obj quot -- )
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over previous get key? [
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2drop
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] [
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over dup previous get set-at
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dup slip
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[ nip (closure) ] curry assoc-each
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] if ; inline
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: closure ( obj quot -- assoc )
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H{ } clone [
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previous [ (closure) ] with-variable
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] keep ; inline
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