1 USING: arrays grouping kernel locals math math.order math.ranges
2 sequences sequences.private splitting ;
6 : reduce1 ( seq quot -- result ) [ unclip ] dip reduce ; inline
8 :: reduce-r ( list identity quot: ( obj1 obj2 -- obj ) -- result )
11 [ list rest identity quot reduce-r list first quot call ] if ;
14 ! Quot must have static stack effect, unlike "reduce"
15 :: reduce* ( seq id quot -- result ) seq
17 [ unclip id swap quot call( prev elt -- next ) quot reduce* ] if-empty ; inline recursive
19 :: combos ( list1 list2 -- result )
20 list2 [ [ 2array ] curry list1 swap map ] map concat ;
22 : find-all ( seq quot -- elts )
23 [ [ length iota ] keep ] dip
24 [ dupd call( a -- ? ) [ 2array ] [ 2drop f ] if ] curry
25 2map [ ] filter ; inline
27 : insert-sorted ( elt seq -- seq )
28 2dup [ < ] with find drop over length or swap insert-nth ;
30 : max-by ( obj1 obj2 quot: ( obj -- n ) -- obj1/obj2 )
31 [ bi@ [ max ] keep eq? not ] curry most ; inline
33 : min-by ( obj1 obj2 quot: ( obj -- n ) -- obj1/obj2 )
34 [ bi@ [ min ] keep eq? not ] curry most ; inline
36 : maximum ( seq quot: ( ... elt -- ... x ) -- elt )
37 [ dup ?first ] dip [ max-by ] curry reduce ; inline
39 : minimum ( seq quot: ( ... elt -- ... x ) -- elt )
40 [ dup ?first ] dip [ min-by ] curry reduce ; inline
42 : all-subseqs ( seq -- seqs )
43 dup length [1,b] [ <clumps> ] with map concat ;
45 :: each-subseq ( ... seq quot: ( ... x -- ... ) -- ... )
51 from to seq subseq quot call( x -- )
55 :: longest-subseq ( seq1 seq2 -- subseq )
60 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
64 y 1 - seq2 nth-unsafe = [
65 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
66 len y x table nth-unsafe set-nth-unsafe
67 len n > [ len n! x end! ] when
68 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
70 ] each end n - end seq1 subseq ;
72 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
73 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
75 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
76 [ change-nth ] 2curry each ; inline
78 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
79 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
81 : index-selector-for ( quot exemplar -- selector accum )
82 [ length ] keep new-resizable [ [ push-if-index ] 2curry ] keep ; inline
84 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
85 dup [ index-selector-for [ each-index ] dip ] curry dip like ; inline
87 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
88 over filter-index-as ; inline
90 : even-indices ( seq -- seq' ) [ nip even? ] filter-index ;
92 : odd-indices ( seq -- seq' ) [ nip odd? ] filter-index ;
94 : compact ( seq quot elt -- seq' )
95 [ split-when harvest ] dip join ; inline
97 : collapse ( seq quot elt -- seq' )
99 [ [ harvest ] dip join ]
100 [ [ first empty? ] dip [ prepend ] curry when ]
101 [ [ last empty? ] dip [ append ] curry when ]
104 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
107 dup seq quot find-from drop
108 [ 2dup = [ 1 + ] when ] [ len ] if*
109 [ seq <slice> ] keep len or swap
110 ] produce nip ; inline
112 : rotate ( seq n -- seq' )
115 :: rotate! ( seq n -- )
118 [ seq exchange ] [ [ 1 + ] bi@ ] 2bi
119 dup end = [ drop over ] when
120 2over = [ -rot nip over ] when
123 : appender-for ( quot exemplar -- quot' vec )
124 [ length ] keep new-resizable
125 [ [ push-all ] curry compose ] keep ; inline
127 : appender ( quot -- quot' vec )
128 V{ } appender-for ; inline
130 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
131 dup [ appender-for [ each ] dip ] curry dip like ; inline
133 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
134 over map-concat-as ; inline
136 : map-filter-as ( ... seq quot: ( ... elt -- ... newelt ) quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
137 dup [ selector-for [ compose each ] dip ] curry dip like ; inline
139 : map-filter ( ... seq quot: ( ... elt -- ... newelt ) quot: ( ... newelt -- ... ? ) -- ... subseq )
140 pick map-filter-as ; inline
142 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
143 [ ] map-filter ; inline
145 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
146 [ empty? not ] map-filter ; inline