factor/basis/unrolled-lists/unrolled-lists.factor

141 lines
3.7 KiB
Factor

! Copyright (C) 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: arrays math kernel accessors sequences sequences.private
deques search-deques hashtables ;
IN: unrolled-lists
CONSTANT: unroll-factor 32
<PRIVATE
MIXIN: ?node
INSTANCE: f ?node
TUPLE: node { data array } { prev ?node } { next ?node } ;
INSTANCE: node ?node
PRIVATE>
TUPLE: unrolled-list
{ front ?node } { front-pos fixnum }
{ back ?node } { back-pos fixnum } ;
: <unrolled-list> ( -- list )
unrolled-list new
unroll-factor >>back-pos ; inline
: <hashed-unrolled-list> ( -- search-deque )
20 <hashtable> <unrolled-list> <search-deque> ;
ERROR: empty-unrolled-list list ;
<PRIVATE
M: unrolled-list deque-empty?
dup [ front>> ] [ back>> ] bi dup [
eq? [ [ front-pos>> ] [ back-pos>> ] bi eq? ] [ drop f ] if
] [ 3drop t ] if ;
M: unrolled-list clear-deque
f >>front
0 >>front-pos
f >>back
unroll-factor >>back-pos
drop ;
: <front-node> ( elt front -- node )
[
unroll-factor 0 <array>
[ unroll-factor 1 - swap set-nth ] keep f
] dip [ node boa dup ] keep
[ prev<< ] [ drop ] if* ; inline
: normalize-back ( list -- )
dup back>> [
dup prev>> [ drop ] [ swap front>> >>prev ] if
] [ dup front>> >>back ] if* drop ; inline
: push-front/new ( elt list -- )
unroll-factor 1 - >>front-pos
[ <front-node> ] change-front
normalize-back ; inline
: push-front/existing ( elt list front -- )
[ [ 1 - ] change-front-pos ] dip
[ front-pos>> ] [ data>> ] bi* set-nth-unsafe ; inline
M: unrolled-list push-front*
dup [ front>> ] [ front-pos>> 0 eq? not ] bi
[ drop ] [ and ] 2bi
[ push-front/existing ] [ drop push-front/new ] if f ;
M: unrolled-list peek-front*
dup front>>
[ [ front-pos>> ] dip data>> nth-unsafe t ]
[ drop f f ]
if* ;
: pop-front/new ( list front -- )
[ 0 >>front-pos ] dip
[ f ] change-next drop dup [ f >>prev ] when >>front
dup front>> [ normalize-back ] [ f >>back drop ] if ; inline
: pop-front/existing ( list front -- )
[ dup front-pos>> ] [ data>> ] bi* [ 0 ] 2dip set-nth-unsafe
[ 1 + ] change-front-pos
drop ; inline
M: unrolled-list pop-front*
dup front>> [ empty-unrolled-list ] unless*
over front-pos>> unroll-factor 1 - eq?
[ pop-front/new ] [ pop-front/existing ] if ;
: <back-node> ( elt back -- node )
[
unroll-factor 0 <array> [ set-first ] keep
] dip [ f node boa dup ] keep
[ next<< ] [ drop ] if* ; inline
: normalize-front ( list -- )
dup front>> [
dup next>> [ drop ] [ swap back>> >>next ] if
] [ dup back>> >>front ] if* drop ; inline
: push-back/new ( elt list -- )
1 >>back-pos
[ <back-node> ] change-back
normalize-front ; inline
: push-back/existing ( elt list back -- )
[ [ 1 + ] change-back-pos ] dip
[ back-pos>> 1 - ] [ data>> ] bi* set-nth-unsafe ; inline
M: unrolled-list push-back*
dup [ back>> ] [ back-pos>> unroll-factor eq? not ] bi
[ drop ] [ and ] 2bi
[ push-back/existing ] [ drop push-back/new ] if f ;
M: unrolled-list peek-back*
dup back>>
[ [ back-pos>> 1 - ] dip data>> nth-unsafe t ]
[ drop f f ]
if* ;
: pop-back/new ( list back -- )
[ unroll-factor >>back-pos ] dip
[ f ] change-prev drop dup [ f >>next ] when >>back
dup back>> [ normalize-front ] [ f >>front drop ] if ; inline
: pop-back/existing ( list back -- )
[ [ 1 - ] change-back-pos ] dip
[ dup back-pos>> ] [ data>> ] bi* [ 0 ] 2dip set-nth-unsafe
drop ; inline
M: unrolled-list pop-back*
dup back>> [ empty-unrolled-list ] unless*
over back-pos>> 1 eq?
[ pop-back/new ] [ pop-back/existing ] if ;
PRIVATE>
INSTANCE: unrolled-list deque