1 ! (c)2009 Joe Groff bsd license
2 USING: kernel sequences sequences.private math
3 combinators macros math.order math.ranges quotations fry effects
4 memoize.private generalizations ;
5 IN: sequences.generalizations
7 MACRO: nmin-length ( n -- )
9 '[ [ length ] _ napply @ ] ;
11 : nnth-unsafe ( n ...seq n -- )
12 [ nth-unsafe ] swap [ apply-curry ] [ cleave* ] bi ; inline
13 MACRO: nset-nth-unsafe ( n -- )
15 [ '[ [ set-nth-unsafe ] _ [ apply-curry ] [ cleave-curry ] [ spread* ] tri ] ]
18 : (neach) ( ...seq quot n -- len quot' )
20 '[ [ _ nmin-length ] _ nkeep [ _ nnth-unsafe ] _ ncurry ] dip compose ; inline
22 : neach ( ...seq quot n -- )
23 (neach) each-integer ; inline
25 : nmap-as ( ...seq quot exemplar n -- result )
26 '[ _ (neach) ] dip map-integers ; inline
28 : nmap ( ...seq quot n -- result )
29 dup '[ [ _ npick ] dip swap ] dip nmap-as ; inline
31 MACRO: nnew-sequence ( n -- )
33 [ dup '[ [ new-sequence ] _ apply-curry _ cleave* ] ] if-zero ;
35 : nnew-like ( len ...exemplar quot n -- result... )
38 [ [ _ nnew-sequence ] dip call ]
44 MACRO: (ncollect) ( n -- )
46 '[ [ [ keep ] _ ndip _ nset-nth-unsafe ] _ ncurry ] ;
48 : ncollect ( len quot ...into n -- )
49 (ncollect) each-integer ; inline
51 : nmap-integers ( len quot ...exemplar n -- result... )
53 '[ [ over ] _ ndip [ [ _ ncollect ] _ nkeep ] _ nnew-like ] call ; inline
55 : mnmap-as ( m*seq quot n*exemplar m n -- result*n )
56 dup '[ [ _ (neach) ] _ ndip _ nmap-integers ] call ; inline
58 : mnmap ( m*seq quot m n -- result*n )
59 2dup '[ [ _ npick ] dip swap _ dupn ] 2dip mnmap-as ; inline
61 : ncollector-for ( quot ...exemplar n -- quot' vec... )
63 [ [ length ] keep new-resizable ] _ napply
64 [ [ [ push ] _ apply-curry _ spread* ] _ ncurry compose ] _ nkeep
67 : ncollector ( quot n -- quot' vec... )
68 [ V{ } swap dupn ] keep ncollector-for ; inline
70 : nproduce-as ( pred quot ...exemplar n -- seq... )
73 [ _ ncollector-for [ while ] _ ndip ]
75 [ like ] _ apply-curry _ spread*
78 : nproduce ( pred quot n -- seq... )
79 [ { } swap dupn ] keep nproduce-as ; inline