87 lines
2.0 KiB
Factor
87 lines
2.0 KiB
Factor
! Copyright (C) 2008 Chris Double & James Cash
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel sequences accessors math arrays vectors classes words ;
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IN: lists
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! List Protocol
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MIXIN: list
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GENERIC: car ( cons -- car )
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GENERIC: cdr ( cons -- cdr )
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GENERIC: nil? ( cons -- ? )
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TUPLE: cons car cdr ;
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C: cons cons
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M: cons car ( cons -- car )
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car>> ;
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M: cons cdr ( cons -- cdr )
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cdr>> ;
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SYMBOL: +nil+
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M: word nil? +nil+ eq? ;
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M: object nil? drop f ;
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: nil ( -- +nil+ ) +nil+ ;
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: uncons ( cons -- cdr car )
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[ cdr ] [ car ] bi ;
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: 1list ( obj -- cons )
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nil cons ;
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: 2list ( a b -- cons )
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nil cons cons ;
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: 3list ( a b c -- cons )
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nil cons cons cons ;
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: 2car ( cons -- car caar )
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[ car ] [ cdr car ] bi ;
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: 3car ( cons -- car caar caaar )
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[ car ] [ cdr car ] [ cdr cdr car ] tri ;
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: lnth ( n list -- elt )
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swap [ cdr ] times car ;
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: (llength) ( list acc -- n )
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over nil? [ nip ] [ [ cdr ] dip 1+ (llength) ] if ;
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: llength ( list -- n )
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0 (llength) ;
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: leach ( list quot -- )
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over nil? [ 2drop ] [ [ uncons swap ] dip tuck [ call ] 2dip leach ] if ; inline
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: lreduce ( list identity quot -- result )
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swapd leach ; inline
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! : lmap ( cons quot -- newcons )
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: (lmap>array) ( acc cons quot -- newcons )
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over nil? [ 2drop ]
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[ [ uncons ] dip [ call ] keep swapd [ suffix ] 2dip (lmap>array) ] if ; inline
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: lmap>array ( cons quot -- newcons )
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{ } -rot (lmap>array) ; inline
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: lmap-as ( cons quot exemplar -- seq )
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[ lmap>array ] dip like ;
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: same? ( obj1 obj2 -- ? )
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[ class ] bi@ = ;
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: seq>cons ( seq -- cons )
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[ <reversed> ] keep nil [ tuck same? [ seq>cons ] when f cons swap >>cdr ] with reduce ;
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: cons>seq ( cons -- array )
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[ dup cons? [ cons>seq ] when ] lmap>array ;
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: traverse ( list quot -- newlist )
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[ over list? [ traverse ] [ call ] if ] curry ;
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INSTANCE: cons list |