48 lines
1.2 KiB
Factor
48 lines
1.2 KiB
Factor
! Copyright (C) 2008 Slava Pestov, Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: assocs hashtables kernel sequences vectors ;
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IN: sets
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: adjoin ( elt seq -- ) [ delete ] [ push ] 2bi ;
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: conjoin ( elt assoc -- ) dupd set-at ;
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: (prune) ( elt hash vec -- )
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3dup drop key? [ 3drop ] [
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[ drop conjoin ] [ nip push ] 3bi
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] if ; inline
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: prune ( seq -- newseq )
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[ ] [ length <hashtable> ] [ length <vector> ] tri
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[ [ (prune) ] 2curry each ] keep ;
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: duplicates ( seq -- newseq )
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H{ } clone [ [ key? ] [ conjoin ] 2bi ] curry filter ;
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: gather ( seq quot -- newseq )
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map concat prune ; inline
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: unique ( seq -- assoc )
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[ dup ] H{ } map>assoc ;
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: (all-unique?) ( elt hash -- ? )
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2dup key? [ 2drop f ] [ conjoin t ] if ;
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: all-unique? ( seq -- ? )
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dup length <hashtable> [ (all-unique?) ] curry all? ;
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: intersect ( seq1 seq2 -- newseq )
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unique [ key? ] curry filter ;
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: diff ( seq1 seq2 -- newseq )
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unique [ key? not ] curry filter ;
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: union ( seq1 seq2 -- newseq )
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append prune ;
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: subset? ( seq1 seq2 -- ? )
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unique [ key? ] curry all? ;
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: set= ( seq1 seq2 -- ? )
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[ unique ] bi@ = ;
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