1 USING: accessors arrays assocs combinators generalizations
2 grouping growable heaps kernel math math.order ranges sequences
3 sequences.private shuffle sorting splitting vectors ;
6 : find-all ( ... seq quot: ( ... elt -- ... ? ) -- ... elts )
7 [ <enumerated> ] dip '[ nip @ ] assoc-filter ; inline
9 :: subseq* ( from to seq -- subseq )
11 from [ dup 0 < [ len + ] when ] [ 0 ] if*
12 to [ dup 0 < [ len + ] when ] [ len ] if*
13 [ 0 len clamp ] bi@ dupd max seq subseq ;
15 : safe-subseq ( from to seq -- subseq )
16 [ length '[ 0 _ clamp ] bi@ ] keep subseq ;
18 : all-subseqs ( seq -- seqs )
19 dup length [1..b] [ clump ] with map concat ;
21 : each-subseq ( ... seq quot: ( ... subseq -- ... ) -- ... )
22 [ dup length [ [0..b] ] [ ] bi ] dip '[
23 dup _ (a..b] [ rot [ subseq _ call ] keep ] with each
26 : map-like ( seq exemplar -- seq' )
27 '[ _ like ] map ; inline
29 : filter-all-subseqs-range ( ... seq range quot: ( ... subseq -- ... ? ) -- seq )
31 '[ <clumps> _ filter ] with map concat
32 ] keepdd map-like ; inline
34 : filter-all-subseqs ( ... seq quot: ( ... subseq -- ... ? ) -- seq )
35 [ dup length [1..b] ] dip filter-all-subseqs-range ; inline
37 :: longest-subseq ( seq1 seq2 -- subseq )
42 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
46 y 1 - seq2 nth-unsafe = [
47 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
48 len y x table nth-unsafe set-nth-unsafe
49 len n > [ len n! x end! ] when
50 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
52 ] each end n - end seq1 subseq ;
54 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
55 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
57 : pad-center ( seq n elt -- padded )
58 swap pick length [-] [ drop ] [
59 [ 2/ ] [ over - ] bi rot '[ _ <repetition> ] bi@
63 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
64 [ change-nth ] 2curry each ; inline
66 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
67 [ keepd ] dip rot [ push ] [ 2drop ] if ; inline
69 : push-if* ( ..a elt quot: ( ..a elt -- ..b obj/f ) accum -- ..b )
70 [ call ] dip [ push ] [ drop ] if* ; inline
72 : push? ( elt/f accum -- )
73 over [ push ] [ 2drop ] if ; inline
77 : (index-selector-as) ( quot length exampler -- selector accum )
78 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
80 : (selector-as*) ( quot length exemplar -- selector accum )
81 new-resizable [ [ push-if* ] 2curry ] keep ; inline
85 : index-selector-as ( quot exemplar -- selector accum )
86 [ length ] keep (index-selector-as) ; inline
88 : index-selector ( quot -- selector accum )
89 V{ } index-selector-as ; inline
91 : selector-as* ( quot exemplar -- selector accum )
92 [ length ] keep (selector-as*) ; inline
94 : selector* ( quot -- selector accum ) V{ } selector-as* ; inline
96 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
97 pick length over [ (index-selector-as) [ each-index ] dip ] 2curry dip like ; inline
99 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
100 over filter-index-as ; inline
102 : even-indices ( seq -- seq' )
103 [ length 1 + 2/ ] keep [
104 [ [ 2 * ] dip nth-unsafe ] curry
105 ] keep map-integers-as ;
107 : odd-indices ( seq -- seq' )
109 [ [ 2 * 1 + ] dip nth-unsafe ] curry
110 ] keep map-integers-as ;
112 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
113 [ split-when harvest ] dip join ; inline
115 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
117 [ [ harvest ] dip join ]
118 [ [ first empty? ] dip [ prepend ] curry when ]
119 [ [ last empty? ] dip [ append ] curry when ]
122 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
125 dup seq quot find-from drop
126 [ 2dup = [ 1 + ] when ] [ len ] if*
127 [ seq <slice> ] keep len or swap
128 ] produce nip ; inline
130 : ?<slice> ( from/f to/f sequence -- slice )
131 [ [ 0 ] unless* ] 2dip
132 over [ nip [ length ] [ ] bi ] unless
135 : sequence>slice ( sequence -- slice )
136 [ drop 0 ] [ length ] [ ] tri <slice> ; inline
138 : slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
139 2dup [ from>> ] bi@ > [ swap ] when ; inline
141 : ordered-slices-range ( slice-lt slice-gt -- to from )
142 [ to>> ] [ from>> ] bi* ;
144 : unordered-slices-range ( slice1 slice2 -- to from )
145 slice-order-by-from ordered-slices-range ;
147 : ordered-slices-overlap? ( slice-lt slice-gt -- ? )
148 ordered-slices-range > ; inline
150 : unordered-slices-overlap? ( slice1 slice2 -- ? )
151 unordered-slices-range > ; inline
153 : slices-overlap? ( slice1 slice2 -- ? )
154 unordered-slices-overlap? ;
156 : ordered-slices-touch? ( slice-lt slice-gt -- ? )
157 ordered-slices-range >= ; inline
159 : unordered-slices-touch? ( slice1 slice2 -- ? )
160 unordered-slices-range >= ; inline
162 : slices-touch? ( slice1 slice2 -- ? )
163 unordered-slices-touch? ;
165 ERROR: slices-don't-touch slice1 slice2 ;
167 : merge-slices ( slice1 slice2 -- slice/* )
169 2dup ordered-slices-touch? [
170 [ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
175 : rotate ( seq n -- seq' )
176 over length mod dup 0 >= [ cut ] [ abs cut* ] if prepend ;
178 ERROR: underlying-mismatch slice1 slice2 ;
180 : ensure-same-underlying ( slice1 slice2 -- slice1 slice2 )
181 2dup [ seq>> ] bi@ eq? [ underlying-mismatch ] unless ;
183 : span-slices ( slice1 slice2 -- slice )
184 ensure-same-underlying
185 [ [ from>> ] bi@ min ]
187 [ drop seq>> ] 2tri <slice> ;
189 : ?span-slices ( slice1/f slice2/f -- slice )
190 2dup and [ span-slices ] [ or ] if ;
192 :: rotate! ( seq n -- )
194 n len mod dup 0 < [ len + ] when seq bounds-check drop 0 over
196 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
197 dup len = [ drop over ] when
198 2over = [ -rot nip over ] when
201 : all-rotations ( seq -- seq' )
202 dup length <iota> [ rotate ] with map ;
206 : (appender-for) ( quot length exemplar -- appender accum )
207 new-resizable [ [ push-all ] curry compose ] keep ; inline
211 : appender-for ( quot exemplar -- appender accum )
212 [ length ] keep (appender-for) ; inline
214 : appender ( quot -- appender accum )
215 V{ } appender-for ; inline
217 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
218 [ appender-for [ each ] dip ] keep like ; inline
220 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
221 [ length ] keep [ new-resizable ] [ append! ] bi ;
223 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
224 over empty? [ 2drop { } ] [
225 [ [ first ] dip call ] 2keep rot [
226 >resizable [ '[ @ _ push-all ] 1 each-from ] keep
230 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
232 [ (selector-as) [ compose each ] dip ] 2curry dip like ; inline
234 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
235 pick map-filter-as ; inline
237 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
238 [ ] map-filter ; inline
240 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
241 [ empty? not ] map-filter ; inline
243 : (each-integer-with-previous) ( ... prev i n quot: ( ... i -- ... ) -- ... )
245 [ nip call ] 4keep nipdd
246 [ 1 + ] 2dip (each-integer-with-previous)
249 ] if ; inline recursive
251 : each-integer-with-previous ( ... n quot: ( ... i -- ... ) -- ... )
252 [ f 0 ] 2dip (each-integer-with-previous) ; inline
254 : (collect-with-previous) ( quot into -- quot' )
255 [ [ keep ] dip [ set-nth-unsafe ] keepdd ] 2curry ; inline
257 : collect-with-previous ( n quot into -- )
258 (collect-with-previous) each-integer-with-previous ; inline
260 : map-integers-with ( ... len quot: ( ... prev i -- ... elt ) exemplar -- ... newseq )
261 overd [ [ collect-with-previous ] keep ] new-like ; inline
263 : map-with-previous-as ( ... seq quot: ( ... elt prev/f -- ... newelt ) exemplar -- ... newseq )
264 [ length-operator ] dip map-integers-with ; inline
266 : map-with-previous ( ... seq quot: ( ... elt prev/f -- ... newelt ) -- ... newseq )
267 over map-with-previous-as ; inline
269 : setup-each-from ( seq quot -- n quot )
270 [ [ length ] keep [ nth-unsafe ] curry ] dip compose ; inline
272 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) from exemplar -- ... newseq )
273 -rotd [ sequence-operator nipd ] dip map-integers-from-as ; inline
275 : map-from ( ... seq quot: ( ... elt -- ... newelt ) from -- ... newseq )
276 pick map-from-as ; inline
278 : map-if ( ... seq if-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
279 '[ dup @ _ when ] map ; inline
281 : reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) from -- ... result )
282 [ swap ] 2dip each-from ; inline
284 : 2reduce-from ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) i -- ... result )
285 [ -rot ] 2dip 2each-from ; inline
287 : 0accumulate-as ( ... seq quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
292 [ swapd [ dup ] compose ] dip map-as nip
295 : 0accumulate ( ... seq quot: ( ... prev elt -- ... next ) -- ... final newseq )
296 over 0accumulate-as ; inline
298 : occurrence-count-by ( seq quot: ( elt -- elt' ) -- hash seq' )
299 '[ nip @ over inc-at* ] [ H{ } clone ] 2dip 0accumulate ; inline
301 : occurrence-count ( seq -- hash seq' )
302 [ ] occurrence-count-by ; inline
304 : nth-index ( n obj seq -- i )
305 [ = dup [ drop 1 - dup 0 < ] when ] with find drop nip ;
307 : progressive-index-by-as ( seq1 seq2 quot exemplar -- hash seq' )
310 tuck [ @ over inc-at* ] 2dip swap nth-index _ or
311 ] [ H{ } clone ] 3dip with
312 ] dip map-as ; inline
314 : progressive-index-by ( seq1 seq2 quot -- hash seq' )
315 { } progressive-index-by-as ; inline
317 : progressive-index ( seq1 seq2 -- hash seq' )
318 [ ] progressive-index-by ; inline
320 : 0reduce ( seq quot: ( prev elt -- next ) -- result )
321 [ 0 ] dip reduce ; inline
323 : ?unclip ( seq -- rest/f first/f )
324 [ f f ] [ unclip ] if-empty ;
326 : 1reduce ( seq quot: ( prev elt -- next ) -- result )
327 [ ?unclip ] dip reduce ; inline
329 : reduce-of ( seq quot: ( prev elt -- next ) identity -- result )
332 : accumulate-of ( seq quot: ( prev elt -- next ) identity -- result )
333 swap accumulate ; inline
337 : push-map-when* ( ..a elt quot: ( ..a elt -- ..b obj ? ) accum -- ..b )
338 [ call ] dip swap [ push ] [ 2drop ] if ; inline
340 : filter-mapper-for* ( quot length exemplar -- filter-mapper accum )
341 new-resizable [ [ push-map-when* ] 2curry ] keep ; inline
343 : 1push-map-when ( ..a filter-quot: ( ..a -- ..b ? ) map-quot: ( ..a -- ..b obj ) accum -- ..b )
344 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
346 : 1filter-mapper-for ( filter-quot map-quot length exemplar -- filter-mapper accum )
347 new-resizable [ [ 1push-map-when ] 3curry ] keep ; inline
349 : 2push-map-when ( ..a filter-quot: ( ..a -- ..b ? ) map-quot: ( ..a -- ..b obj ) accum -- ..b )
350 [ 2keep rot ] 2dip '[ [ @ _ push ] [ 2drop ] if ] call ; inline
352 : 2filter-mapper-for ( filter-quot map-quot length exemplar -- filter-mapper accum )
353 new-resizable [ [ 2push-map-when ] 3curry ] keep ; inline
357 : filter-map-as* ( ... seq quot: ( ..a elt -- ..b obj ? ) exemplar -- ... newseq )
359 [ filter-mapper-for* [ each ] dip ] 2curry dip like ; inline
361 : filter-map* ( ... seq quot: ( ... elt -- ... newelt ? ) -- ... newseq )
362 over filter-map-as* ; inline
364 : reject-map-as* ( ... seq quot: ( ... elt -- ... newelt ? ) exemplar -- ... newseq )
365 [ [ not ] compose ] dip filter-map-as* ; inline
367 : reject-map* ( ... seq quot: ( ... elt -- ... newelt ? ) -- ... newseq )
368 over reject-map-as* ; inline
370 : 2filter-map-as* ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... obj ? ) exemplar -- ... newseq )
372 [ filter-mapper-for* [ 2each ] dip ] 2curry dip like ; inline
374 : 2filter-map* ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... newseq )
375 pick 2filter-map-as* ; inline
377 : 2reject-map-as* ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... obj ? ) exemplar -- ... newseq )
378 [ [ not ] compose ] dip 2filter-map-as* ; inline
380 : 2reject-map* ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... obj ? ) -- ... newseq )
381 pick 2reject-map-as* ; inline
384 : filter-map-as ( ... seq filter-quot: ( ..a elt -- ..b ? ) map-quot: ( obj -- obj' ) exemplar -- ... newseq )
386 [ 1filter-mapper-for [ each ] dip ] 2curry dip like ; inline
388 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( obj -- obj' ) -- ... newseq )
389 pick filter-map-as ; inline
391 : reject-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( obj -- obj' ) exemplar -- ... newseq )
392 [ [ not ] compose ] 2dip filter-map-as ; inline
394 : reject-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( obj -- obj' ) -- ... newseq )
395 pick reject-map-as ; inline
397 : 2filter-map-as ( ... seq1 seq2 filter-quot: ( ... elt1 elt2 -- ... ? ) map-quot: ( elt1 elt2 -- obj ) exemplar -- ... newseq )
399 [ 2filter-mapper-for [ 2each ] dip ] 2curry dip like ; inline
401 : 2filter-map ( ... seq1 seq2 filter-quot: ( ... elt1 elt2 -- ... ? ) map-quot: ( elt1 elt2 -- obj ) -- ... newseq )
402 reach 2filter-map-as ; inline
404 : 2reject-map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) map-quot: ( elt1 elt2 -- obj ) exemplar -- ... newseq )
405 [ [ not ] compose ] 2dip 2filter-map-as ; inline
407 : 2reject-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) map-quot: ( elt1 elt2 -- obj ) -- ... newseq )
408 pick 2reject-map-as ; inline
411 : 2filter-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
414 [ (2selector-as) [ 2each ] dip ] 2curry call
417 : 2filter ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
418 pick 2filter-as ; inline
420 : 2reject-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
421 [ [ not ] compose ] dip 2filter-as ; inline
423 : 2reject ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
424 pick 2reject-as ; inline
426 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
427 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
429 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
430 [ 1 0 ? ] compose 2map-sum ; inline
433 ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) i -- ... )
434 [ 3length-operator ] dip -rot each-integer-from ; inline
437 ( ..a seq1 seq2 seq3 map-quot: ( ..a elt1 elt2 elt3 -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
438 [ [ [ [ first ] tri@ ] 3keep ] dip [ 3dip ] keep ] dip compose 1 3each-from ; inline
440 : round-robin ( seq -- newseq )
442 [ longest length <iota> ] keep
443 [ [ ?nth ] with map ] curry map concat sift
446 : sift-as ( seq exemplar -- newseq )
449 : sift! ( seq -- newseq )
452 : harvest-as ( seq exemplar -- newseq )
453 [ empty? not ] swap filter-as ;
455 : harvest! ( seq -- newseq )
458 : head-as ( seq n exemplar -- seq' )
459 [ head-slice ] [ like ] bi* ; inline
461 : head*-as ( seq n exemplar -- seq' )
462 [ head-slice* ] [ like ] bi* ; inline
464 : tail-as ( seq n exemplar -- seq' )
465 [ tail-slice ] [ like ] bi* ; inline
467 : tail*-as ( seq n exemplar -- seq' )
468 [ tail-slice* ] [ like ] bi* ; inline
470 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
471 [ trim-slice ] [ like ] bi* ; inline
473 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
474 over empty? [ drop ] [
475 over [ first-unsafe ] [ last-unsafe ] bi pick either?
479 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
480 over empty? [ drop ] [
481 over first-unsafe over call
482 [ trim-head ] [ drop ] if
485 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
486 over empty? [ drop ] [
487 over last-unsafe over call
488 [ trim-tail ] [ drop ] if
491 : unsurround ( newseq seq2 seq3 -- seq1 )
492 [ ?head drop ] [ ?tail drop ] bi* ;
494 : >string-list ( seq -- seq' )
495 [ "\"" 1surround ] map "," join ;
497 : with-string-lines ( str quot -- str' )
498 [ string-lines ] dip map "\n" join ; inline
500 : prepend-lines-with-spaces ( str -- str' )
501 [ " " prepend ] with-string-lines ;
503 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
505 [ 1 + ] 2dip find-from drop not
506 ] [ 3drop f ] if ; inline
508 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
509 over [ [ sequence-index-operator ] dip collect ] keep ; inline
513 : 2sequence-index-iterator ( seq1 seq2 quot -- n quot' )
514 [ 2length-iterator [ keep ] curry ] dip compose ; inline
518 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
519 2sequence-index-iterator each-integer ; inline
521 : 2map-into ( seq1 seq2 quot into -- )
522 [ 2length-operator ] dip collect ; inline
524 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
525 pick [ 2map-into ] keep ; inline
527 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
528 pick [ 2sequence-index-iterator ] dip map-integers-as ; inline
530 TUPLE: evens { seq read-only } ;
534 M: evens length seq>> length 1 + 2/ ; inline
536 M: evens virtual@ [ 2 * ] [ seq>> ] bi* ; inline
538 M: evens virtual-exemplar seq>> ; inline
540 INSTANCE: evens virtual-sequence
542 TUPLE: odds { seq read-only } ;
546 M: odds length seq>> length 2/ ; inline
548 M: odds virtual@ [ 2 * 1 + ] [ seq>> ] bi* ; inline
550 M: odds virtual-exemplar seq>> ; inline
552 INSTANCE: odds virtual-sequence
554 : until-empty ( seq quot -- )
555 [ dup empty? ] swap until drop ; inline
559 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
560 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
564 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
565 over length <vector> [
566 [ push-index-if ] 2curry each-index
569 : arg-sort ( seq -- indices )
570 zip-index sort-keys values ;
572 : first= ( seq elt -- ? ) [ first ] dip = ; inline
573 : second= ( seq elt -- ? ) [ second ] dip = ; inline
574 : third= ( seq elt -- ? ) [ third ] dip = ; inline
575 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
576 : last= ( seq elt -- ? ) [ last ] dip = ; inline
577 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
579 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
580 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
581 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
582 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
583 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
584 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
586 : loop>sequence** ( ... quot: ( ... -- ... obj ? ) exemplar -- ... seq )
587 [ ] swap produce-as nip ; inline
589 : loop>array** ( ... quot: ( ... -- ... obj ? ) -- ... array )
590 { } loop>sequence** ; inline
592 : loop>sequence* ( ... quot: ( ... -- ... obj ? ) exemplar -- ... seq )
593 [ t ] [ '[ [ _ dip ] [ f f f ] if* ] [ swap ] ] [ produce-as 2nip ] tri* ; inline
595 : loop>array* ( ... quot: ( ... -- ... obj ? ) -- ... array )
596 { } loop>sequence* ; inline
598 : loop>sequence ( ... quot: ( ... -- ... obj/f ) exemplar -- ... seq )
599 [ [ dup ] compose [ ] ] dip produce-as nip ; inline
601 : loop>array ( ... quot: ( ... -- ... obj/f ) -- ... array )
602 { } loop>sequence ; inline
604 : zero-loop>sequence ( ... quot: ( ... n -- ... obj/f ) exemplar -- ... seq )
605 [ 0 ] [ '[ _ keep 1 + swap ] ] [ loop>sequence ] tri* nip ; inline
607 : zero-loop>array ( quot: ( ..a n -- ..a obj ) -- seq )
608 { } zero-loop>sequence ; inline
610 : iterate-heap-while ( heap quot1: ( value key -- slurp? ) quot2: ( value key -- obj/f ) -- obj/f loop? )
614 [ [ heap-peek ] 2dip drop 2keep ]
616 nip ! ( pop? value key heap quot2 )
618 swap heap-pop* call( value key -- obj/f ) t
625 : slurp-heap-while-map ( heap quot1: ( value key -- slurp? ) quot2: ( value key -- obj/f ) -- seq )
626 '[ _ _ _ iterate-heap-while ] loop>array* ; inline
628 : heap>pairs ( heap -- pairs )
629 [ 2drop t ] [ swap 2array ] slurp-heap-while-map ;
631 : map-zip-swap ( quot: ( x -- y ) -- alist )
632 '[ _ keep ] map>alist ; inline
634 : ?heap-pop-value>array ( heap -- array )
635 dup heap-empty? [ drop { } ] [ heap-pop drop 1array ] if ;
639 : (reverse) ( seq -- newseq )
640 dup [ length ] keep new-sequence
641 [ 0 swap copy-unsafe ] keep reverse! ;
645 : reverse-as ( seq exemplar -- newseq )
646 [ (reverse) ] [ like ] bi* ;
648 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
649 [ 1 ] 2dip [ dip * ] with-assoc each ; inline
651 : insert-nth! ( elt n seq -- )
652 [ length ] keep ensure swap pick (a..b]
653 over '[ [ 1 + ] keep _ move-unsafe ] each
656 : set-nths ( value indices seq -- )
657 swapd '[ _ swap _ set-nth ] each ; inline
659 : set-nths-unsafe ( value indices seq -- )
660 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
664 : (map-find-index) ( seq quot find-quot -- result i elt )
665 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
666 [ [ [ drop f ] unless ] keep ] dip ; inline
670 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
671 [ find-index ] (map-find-index) ; inline
673 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
675 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
677 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
681 : nth-unsafe-of ( seq n -- elt ) swap nth-unsafe ; inline
682 : set-nth-unsafe-of ( seq n elt -- seq ) spin [ set-nth-unsafe ] keep ; inline
683 : set-length-of ( seq n -- seq ) over set-length ; inline
685 : move-unsafe-of ( seq to from -- seq )
689 overd nth-unsafe-of set-nth-unsafe-of
692 : move-backward-of ( seq shift from to -- seq )
696 [ [ [ + ] keep move-unsafe-of ] 2keep 1 + ] dip move-backward-of
699 : open-slice-of ( seq shift from -- seq )
703 [ ] [ drop [ length ] dip + ] 3bi
704 [ pick length [ over - ] dip move-backward-of ] dip
710 : index-of ( seq obj -- n ) '[ _ = ] find drop ;
712 ERROR: slice-error-of from to seq ;
714 : check-slice-of ( seq from to -- seq from to )
715 over 0 < [ slice-error-of ] when
716 dup reach length > [ slice-error-of ] when
717 2dup > [ slice-error-of ] when ; inline
719 : delete-slice-of ( seq from to -- seq )
720 check-slice-of over [ - ] dip open-slice-of ;
722 : remove-nth-of ( seq n -- seq' )
723 [ dup 1 + rot snip-slice ] keepd append-as ;
725 : remove-nth-of! ( seq n -- seq )
726 dup 1 + delete-slice-of ;
728 : snip-of ( seq from to -- head tail )
729 [ head ] [ tail ] bi-curry* bi ; inline
731 : snip-slice-of ( seq from to -- head tail )
732 [ head-slice ] [ tail-slice ] bi-curry* bi ; inline
734 : remove-first ( obj seq -- seq' )
735 [ index ] keep over [ remove-nth ] [ nip ] if ;
737 : remove-first-of ( seq obj -- seq' )
738 dupd index-of [ remove-nth-of ] when* ;
740 : remove-first! ( obj seq -- seq )
741 [ index ] keep over [ remove-nth! ] [ nip ] if ;
743 : remove-last ( obj seq -- seq' )
744 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
746 : remove-last! ( obj seq -- seq )
747 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
749 : member-of? ( seq elt -- ? )
752 : member-eq-of? ( seq elt -- ? )
755 : remove-of ( seq elt -- newseq )
758 : remove-eq-of ( seq elt -- newseq )
759 [ eq? ] curry reject ;
761 : ?first2 ( seq -- first/f second/f )
764 { 1 [ first-unsafe f ] }
765 [ drop first2-unsafe ]
768 : ?first3 ( seq -- first/f second/f third/f )
771 { 1 [ first-unsafe f f ] }
772 { 2 [ first2-unsafe f ] }
773 [ drop first3-unsafe ]
776 : ?first4 ( seq -- first/f second/f third/f fourth/f )
778 { 0 [ drop f f f f ] }
779 { 1 [ first-unsafe f f f ] }
780 { 2 [ first2-unsafe f f ] }
781 { 3 [ first3-unsafe f ] }
782 [ drop first4-unsafe ]
785 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
786 [ find drop ] keepd swap
787 [ cut ] [ f over like ] if* ; inline
789 : nth* ( n seq -- elt )
790 [ length 1 - swap - ] [ nth ] bi ; inline
792 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
793 -rot sequence-index-operator each-integer-from ; inline
797 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
799 [ keep swap ] curry [ dip ] curry
800 [ [ first 0 ] dip call ] 2keep
801 [ 2curry 3dip 5 npick pick ] curry
803 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
804 ] bi* compose 1 each-index-from nip swap ; inline
808 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
809 [ after? ] select-by* ; inline
811 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
812 [ before? ] select-by* ; inline
814 : arg-max ( seq -- n )
815 [ ] supremum-by* drop ;
817 : arg-min ( seq -- n )
818 [ ] infimum-by* drop ;
820 : ?supremum ( seq/f -- elt/f )
822 [ ] [ 2dup and [ max ] [ dupd ? ] if ] map-reduce
825 : ?infimum ( seq/f -- elt/f )
827 [ ] [ 2dup and [ min ] [ dupd ? ] if ] map-reduce
830 : map-infimum ( seq quot: ( ... elt -- ... elt' ) -- elt' )
831 [ min ] map-reduce ; inline
833 : map-supremum ( seq quot: ( ... elt -- ... elt' ) -- elt' )
834 [ max ] map-reduce ; inline
836 : change-last ( seq quot -- )
837 [ index-of-last ] [ change-nth ] bi* ; inline
839 : change-last-unsafe ( seq quot -- )
840 [ index-of-last ] [ change-nth-unsafe ] bi* ; inline
842 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
843 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
845 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
846 over [ count ] [ length ] bi* / ; inline
848 : sequence-index-operator-last ( n seq quot -- n quot' )
849 [ [ nth-unsafe ] curry [ keep ] curry ] dip compose ; inline
851 : find-last-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
853 _ [ sequence-index-operator-last find-last-integer ] keepd
855 ] bounds-check-call ; inline
857 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
858 [ index-of-last ] dip find-last-index-from ; inline
860 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
861 [ find-last-index ] (map-find-index) ; inline
863 :: (start-all) ( seq subseq increment -- indices )
865 [ seq subseq subseq-index-from dup ]
866 [ [ increment + ] keep ] produce nip ;
868 : start-all ( seq subseq -- indices )
869 dup length (start-all) ; inline
871 : start-all* ( seq subseq -- indices )
872 1 (start-all) ; inline
874 : count-subseq ( seq subseq -- n )
875 start-all length ; inline
877 : count-subseq* ( seq subseq -- n )
878 start-all* length ; inline
880 : assoc-zip-with ( quot: ( key value -- calc ) -- alist )
881 '[ _ 2keep 2array swap ] assoc-map ; inline
883 : take-while ( ... seq quot: ( ... elt -- ... ? ) -- head-slice )
884 [ '[ @ not ] find drop ] keepd swap
885 [ dup length ] unless* head-slice ; inline
887 : drop-while ( ... seq quot: ( ... elt -- ... ? ) -- tail-slice )
888 [ '[ @ not ] find drop ] keepd swap
889 [ dup length ] unless* tail-slice ; inline
891 : count-head ( seq quot -- n )
892 [ not ] compose [ find drop ] keepd length or ; inline
894 : count-tail ( seq quot -- n )
895 [ not ] compose [ find-last drop ] keepd
896 length swap [ - 1 - ] when* ; inline
898 :: shorten* ( vector n -- seq )
902 :: interleaved-as ( seq glue exemplar -- newseq )
903 seq length dup 1 - + 0 max exemplar new-sequence :> newseq
904 seq [ 2 * newseq set-nth-unsafe ] each-index
905 seq length 1 - [ 2 * 1 + glue swap newseq set-nth-unsafe ] each-integer
908 : interleaved ( seq glue -- newseq )
909 over interleaved-as ;
911 : extract! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
912 [ dup ] compose over [ length ] keep new-resizable
913 [ [ push-when ] 2curry reject! ] keep swap like ; inline
915 : find-pred-loop ( ... i n seq quot: ( ... elt -- ... calc ? ) -- ... calc/f i/f elt/f )
919 [ [ 3drop ] 2dip rot ]
920 [ 2drop [ 1 + ] 3dip find-pred-loop ] if
923 ] if ; inline recursive
925 : find-pred ( ... seq quot: ( ... elt -- ... calc ) pred: ( ... calc -- ... ? ) -- ... calc/f i/f elt/f )
927 [ [ length check-length ] keep ] 2dip
928 '[ nth-unsafe _ keep swap _ keep swap ] find-pred-loop swapd ; inline
930 ! https://en.wikipedia.org/wiki/Maximum_subarray_problem
931 ! Kadane's algorithm O(n) largest sum in subarray
932 : max-subarray-sum ( seq -- sum )
934 [ [ + ] keep max [ max ] keep ] each drop ;
937 { from integer read-only initial: 0 }
938 { to integer read-only initial: 0 }
940 { step integer read-only } ;
942 :: <step-slice> ( from/f to/f step seq -- step-slice )
943 step zero? [ "can't be zero" throw ] when
949 from/f [ len ] unless*
952 [ dup 0 < [ len + ] when 0 len clamp ] bi@
953 ! FIXME: make this work with steps
954 seq dup slice? [ collapse-slice ] when
955 step step-slice boa ;
957 M: step-slice virtual-exemplar seq>> ; inline
959 M: step-slice virtual@
960 [ step>> * ] [ from>> + ] [ seq>> ] tri ; inline
963 [ to>> ] [ from>> - ] [ step>> ] tri
964 dup 0 < [ [ neg 0 max ] dip neg ] when /mod
965 zero? [ 1 + ] unless ; inline
967 INSTANCE: step-slice virtual-sequence
969 : 2nested-each* ( seq1 seq-quot: ( n -- seq ) quot: ( a b -- ) -- )
971 _ keep swap _ with each
974 : 2nested-filter-as* ( seq1 seq-quot quot exemplar -- seq )
975 [ 2over [ length ] bi@ * ] dip
978 [ [ push? ] curry compose 2nested-each* ] keep
981 : 2nested-filter* ( seq1 seq-quot quot -- seq )
982 pick 2nested-filter-as* ; inline
984 : 2nested-map-as* ( seq1 seq-quot quot exemplar -- seq )
985 [ 2over [ length ] bi@ * ] dip
988 [ [ push ] curry compose 2nested-each* ] keep
991 : 2nested-map* ( seq1 seq-quot quot -- seq )
992 pick 2nested-map-as* ; inline
995 : 2nested-each ( seq1 seq2 quot -- )
1000 : 2nested-filter-as ( seq1 seq2 quot exemplar -- seq )
1001 [ 2over [ length ] bi@ * ] dip
1004 [ [ push? ] curry compose 2nested-each ] keep
1005 ] keep like ; inline
1007 : 2nested-filter ( seq1 seq2 quot -- seq )
1008 pick 2nested-filter-as ; inline
1010 : 2nested-map-as ( seq1 seq2 quot exemplar -- seq )
1011 [ 2over [ length ] bi@ * ] dip
1014 [ [ push ] curry compose 2nested-each ] keep
1015 ] keep like ; inline
1017 : 2nested-map ( seq1 seq2 quot -- seq )
1018 pick 2nested-map-as ; inline
1020 : 3nested-each ( seq1 seq2 seq3 quot -- )
1023 swap _ with with each
1025 ] with with each ; inline
1027 : 3nested-filter-as ( seq1 seq2 seq3 quot exemplar -- seq )
1028 [ 3 nover [ length ] tri@ * * ] dip
1031 [ [ push? ] curry compose 3nested-each ] keep
1032 ] keep like ; inline
1034 : 3nested-filter ( seq1 seq2 seq3 quot -- seq )
1035 reach 3nested-filter-as ; inline
1037 : 3nested-map-as ( seq1 seq2 seq3 quot exemplar -- seq )
1038 [ 3 nover [ length ] tri@ * * ] dip
1041 [ [ push ] curry compose 3nested-each ] keep
1042 ] keep like ; inline
1044 : 3nested-map ( seq1 seq2 seq3 quot -- seq )
1045 reach 3nested-map-as ; inline
1047 : prev ( n seq -- obj ) [ 1 - ] dip nth ; inline
1048 : ?prev ( n seq -- obj/f ) [ 1 - ] dip ?nth ; inline
1049 : ??prev ( n seq -- obj/f ? ) [ 1 - ] dip ??nth ; inline
1050 : prev-of ( seq n -- obj ) 1 - nth-of ; inline
1051 : ?prev-of ( seq n -- obj/f ) 1 - ?nth-of ; inline
1052 : ??prev-of ( seq n -- obj/f ? ) 1 - ??nth-of ; inline
1054 : prev-identity ( i seq -- identity i seq )
1055 2dup ??prev [ drop 0 ] unless -rot ; inline
1057 : each-prior-identity-from ( ... identity i seq quot: ( ... prior elt -- ... ) -- ... )
1058 '[ [ swap @ ] keep ]
1059 length-operator each-integer-from drop ; inline
1061 : each-prior-from ( ... i seq quot: ( ... prior elt -- ... ) -- ... )
1062 [ prev-identity ] dip each-prior-identity-from ; inline
1064 : each-prior ( ... seq quot: ( ... prior elt -- ... ) -- ... )
1065 0 -rot each-prior-from ; inline
1067 : map-prior-identity-from-as ( ... identity i seq quot: ( ... prior elt -- elt' ) exemplar -- seq' )
1069 '[ [ swap @ ] keep swap ] length-operator
1070 ] dip map-integers-from-as nip ; inline
1072 : map-prior-identity-as ( ... identity seq quot: ( ... prior elt -- elt' ) exemplar -- seq' )
1073 [ 0 ] 3dip map-prior-identity-from-as ; inline
1075 : map-prior-from-as ( ... i seq quot: ( ... prior elt -- elt' ) exemplar -- seq' )
1076 [ prev-identity ] 2dip map-prior-identity-from-as ; inline
1078 : map-prior-as ( ... seq quot: ( ... prior elt -- elt' ) exemplar -- seq' )
1079 0 -roll map-prior-from-as ; inline
1081 : map-prior-from ( ... i seq quot: ( ... prior elt -- elt' ) -- seq' )
1082 over map-prior-from-as ; inline
1084 : map-prior ( ... seq quot: ( ... prior elt -- elt' ) -- seq' )
1085 over map-prior-as ; inline
1087 TUPLE: virtual-zip-index seq ;
1089 C: <zip-index> virtual-zip-index
1091 M: virtual-zip-index length seq>> length ; inline
1093 M: virtual-zip-index nth-unsafe
1094 over [ seq>> nth-unsafe ] [ 2array ] bi* ; inline
1096 INSTANCE: virtual-zip-index immutable-sequence