38 lines
1.0 KiB
Factor
38 lines
1.0 KiB
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 sets ;
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IN: graphs
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: if-graph ( vertex edges graph quot -- )
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dupd [ 3drop ] if ; inline
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: nest ( key graph -- hash )
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[ drop H{ } clone ] cache ; inline
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: add-vertex ( vertex edges graph -- )
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[ [ nest dupd set-at ] curry with each ] if-graph ; inline
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: add-vertex* ( vertex edges graph -- )
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[
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swapd [ [ rot ] dip nest set-at ] 2curry assoc-each
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] if-graph ; inline
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: remove-vertex ( vertex edges graph -- )
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[ [ at delete-at ] curry with each ] if-graph ; inline
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: remove-vertex* ( vertex edges graph -- )
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[
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swapd [ [ rot ] dip at delete-at drop ] 2curry assoc-each
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] if-graph ; inline
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: (closure) ( obj assoc quot: ( elt -- assoc ) -- )
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2over key? [
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3drop
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] [
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2over conjoin [ dip ] keep
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[ [ drop ] 3dip (closure) ] 2curry assoc-each
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] if ; inline recursive
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: closure ( obj quot -- assoc )
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H{ } clone [ swap (closure) ] keep ; inline
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