48 lines
1.4 KiB
Factor
48 lines
1.4 KiB
Factor
! Copyright (C) 2007 Daniel Ehrenberg
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! See http://factorcode.org/license.txt for BSD license.
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USING: sequences kernel strings math ;
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IN: sequences.deep
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! All traversal goes in postorder
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GENERIC: branch? ( object -- ? )
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M: sequence branch? drop t ;
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M: integer branch? drop f ;
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M: string branch? drop f ;
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M: object branch? drop f ;
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: deep-each ( obj quot: ( elt -- ) -- )
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[ call ] 2keep over branch?
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[ [ deep-each ] curry each ] [ 2drop ] if ; inline recursive
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: deep-map ( obj quot: ( elt -- elt' ) -- newobj )
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[ call ] keep over branch?
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[ [ deep-map ] curry map ] [ drop ] if ; inline recursive
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: deep-filter ( obj quot: ( elt -- ? ) -- seq )
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over [ pusher [ deep-each ] dip ] dip
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dup branch? [ like ] [ drop ] if ; inline recursive
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: (deep-find) ( obj quot: ( elt -- ? ) -- elt ? )
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[ call ] 2keep rot [ drop t ] [
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over branch? [
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f -rot [ [ nip ] dip (deep-find) ] curry find drop >boolean
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] [ 2drop f f ] if
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] if ; inline recursive
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: deep-find ( obj quot -- elt ) (deep-find) drop ; inline
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: deep-contains? ( obj quot -- ? ) (deep-find) nip ; inline
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: deep-all? ( obj quot -- ? )
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[ not ] compose deep-contains? not ; inline
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: deep-change-each ( obj quot: ( elt -- elt' ) -- )
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over branch? [
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[ [ call ] keep over [ deep-change-each ] dip ] curry change-each
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] [ 2drop ] if ; inline recursive
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: flatten ( obj -- seq )
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[ branch? not ] deep-filter ;
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