1 USING: accessors arrays assocs combinators fry generalizations
2 grouping growable kernel locals make math math.order math.ranges
3 sequences sequences.deep sequences.private sorting splitting
7 : reduce1 ( seq quot -- result ) [ unclip ] dip reduce ; inline
9 :: reduce-r ( seq identity quot: ( obj1 obj2 -- obj ) -- result )
11 unclip [ identity quot reduce-r ] [ quot call ] bi*
12 ] if-empty ; inline recursive
14 ! Quot must have static stack effect, unlike "reduce"
15 :: reduce* ( seq identity quot: ( prev elt -- next ) -- result )
17 unclip identity swap quot call( prev elt -- next )
19 ] if-empty ; inline recursive
21 :: combos ( list1 list2 -- result )
22 list2 [ [ 2array ] curry list1 swap map ] map concat ;
24 : find-all ( seq quot: ( elt -- ? ) -- elts )
25 [ [ length iota ] keep ] dip
26 [ dupd call( a -- ? ) [ 2array ] [ 2drop f ] if ] curry
29 : reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) i -- ... result )
30 [ swap ] 2dip each-from ; inline
32 :: subseq* ( from to seq -- subseq )
34 from [ dup 0 < [ len + ] when ] [ 0 ] if*
35 to [ dup 0 < [ len + ] when ] [ len ] if*
36 [ 0 len clamp ] bi@ dupd max seq subseq ;
38 : safe-subseq ( from to seq -- subseq )
39 [ length '[ 0 _ clamp ] bi@ ] keep subseq ;
41 : all-subseqs ( seq -- seqs )
42 dup length [1,b] [ clump ] with map concat ;
44 :: each-subseq ( ... seq quot: ( ... x -- ... ) -- ... )
50 from to seq subseq quot call
54 : map-like ( seq exemplar -- seq' )
55 '[ _ like ] map ; inline
57 : filter-all-subseqs-range ( ... seq range quot: ( ... x -- ... ) -- seq )
59 '[ <clumps> _ filter ] with map concat
60 ] 3keep 2drop map-like ; inline
62 : filter-all-subseqs ( ... seq quot: ( ... x -- ... ) -- seq )
63 [ dup length [1,b] ] dip filter-all-subseqs-range ; inline
65 :: longest-subseq ( seq1 seq2 -- subseq )
70 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
74 y 1 - seq2 nth-unsafe = [
75 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
76 len y x table nth-unsafe set-nth-unsafe
77 len n > [ len n! x end! ] when
78 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
80 ] each end n - end seq1 subseq ;
82 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
83 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
85 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
86 [ change-nth ] 2curry each ; inline
88 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
89 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
91 : push-if* ( ..a elt quot: ( ..a elt -- ..b obj/f ) accum -- ..b )
92 [ call ] dip [ push ] [ drop ] if* ; inline
96 : (index-selector-for) ( quot length exampler -- selector accum )
97 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
99 : (selector-for*) ( quot length exemplar -- selector accum )
100 new-resizable [ [ push-if* ] 2curry ] keep ; inline
104 : index-selector-for ( quot exemplar -- selector accum )
105 [ length ] keep (index-selector-for) ; inline
107 : index-selector ( quot -- selector accum )
108 V{ } index-selector-for ; inline
110 : selector-for* ( quot exemplar -- selector accum )
111 [ length ] keep (selector-for*) ; inline
113 : selector* ( quot -- selector accum ) V{ } selector-for* ; inline
115 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
116 pick length over [ (index-selector-for) [ each-index ] dip ] 2curry dip like ; inline
118 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
119 over filter-index-as ; inline
121 : even-indices ( seq -- seq' )
122 [ length 1 + 2/ ] keep [
123 [ [ 2 * ] dip nth-unsafe ] curry
124 ] keep map-integers ;
126 : odd-indices ( seq -- seq' )
128 [ [ 2 * 1 + ] dip nth-unsafe ] curry
129 ] keep map-integers ;
131 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
132 [ split-when harvest ] dip join ; inline
134 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
136 [ [ harvest ] dip join ]
137 [ [ first empty? ] dip [ prepend ] curry when ]
138 [ [ last empty? ] dip [ append ] curry when ]
141 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
144 dup seq quot find-from drop
145 [ 2dup = [ 1 + ] when ] [ len ] if*
146 [ seq <slice> ] keep len or swap
147 ] produce nip ; inline
149 : cut-slice* ( seq n -- before after )
150 [ head-slice* ] [ tail-slice* ] 2bi ;
152 : ?<slice> ( from to/f sequence -- slice )
153 over [ nip [ length ] [ ] bi ] unless <slice> ; inline
155 : sequence>slice ( sequence -- slice )
156 [ drop 0 ] [ length ] [ ] tri <slice> ; inline
158 : slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
159 2dup [ from>> ] bi@ > [ swap ] when ; inline
161 : ordered-slices-range ( slice-lt slice-gt -- to from )
162 [ to>> ] [ from>> ] bi* ;
164 : unordered-slices-range ( slice1 slice2 -- to from )
165 slice-order-by-from ordered-slices-range ;
167 : ordered-slices-overlap? ( slice-lt slice-gt -- ? )
168 ordered-slices-range > ; inline
170 : unordered-slices-overlap? ( slice1 slice2 -- ? )
171 unordered-slices-range > ; inline
173 : slices-overlap? ( slice1 slice2 -- ? )
174 unordered-slices-overlap? ;
176 : ordered-slices-touch? ( slice-lt slice-gt -- ? )
177 ordered-slices-range >= ; inline
179 : unordered-slices-touch? ( slice1 slice2 -- ? )
180 unordered-slices-range >= ; inline
182 : slices-touch? ( slice1 slice2 -- ? )
183 unordered-slices-touch? ;
185 ERROR: slices-don't-touch slice1 slice2 ;
187 : merge-slices ( slice1 slice2 -- slice/* )
189 2dup ordered-slices-touch? [
190 [ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
195 : rotate ( seq n -- seq' )
196 over length mod dup 0 >= [ cut ] [ abs cut* ] if prepend ;
198 ERROR: underlying-mismatch slice1 slice2 ;
199 : ensure-same-underlying ( slice1 slice2 -- slice1 slice2 )
200 2dup [ seq>> ] bi@ eq? [ underlying-mismatch ] unless ;
202 : span-slices ( slice1 slice2 -- slice )
203 ensure-same-underlying
204 [ [ from>> ] bi@ min ]
206 [ drop seq>> ] 2tri <slice> ;
208 :: rotate! ( seq n -- )
210 n len mod dup 0 < [ len + ] when seq bounds-check drop 0 over
212 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
213 dup len = [ drop over ] when
214 2over = [ -rot nip over ] when
217 : all-rotations ( seq -- seq' )
218 dup length iota [ rotate ] with map ;
222 : (appender-for) ( quot length exemplar -- appender accum )
223 new-resizable [ [ push-all ] curry compose ] keep ; inline
227 : appender-for ( quot exemplar -- appender accum )
228 [ length ] keep (appender-for) ; inline
230 : appender ( quot -- appender accum )
231 V{ } appender-for ; inline
233 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
234 [ appender-for [ each ] dip ] keep like ; inline
236 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
237 [ length ] keep [ new-resizable ] [ append! ] bi ;
239 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
240 over empty? [ 2drop { } ] [
241 [ [ first ] dip call ] 2keep rot dup [
242 >resizable [ [ push-all ] curry compose ] keep
243 [ 1 ] 3dip [ setup-each (each-integer) ] dip
247 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
248 [ pick ] dip swap length over
249 [ (selector-for) [ compose each ] dip ] 2curry dip like ; inline
251 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
252 pick map-filter-as ; inline
254 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
255 [ ] map-filter ; inline
257 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
258 [ empty? not ] map-filter ; inline
262 : (setup-each-from) ( i seq -- n quot )
263 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
265 : setup-each-from ( i seq quot -- n quot' )
266 [ (setup-each-from) ] dip compose ; inline
270 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
271 [ -rot setup-each-from ] dip map-integers ; inline
273 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
274 pick map-from-as ; inline
278 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
279 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
281 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
282 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
284 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
285 [ length ] keep (filter-mapper-for) ; inline
287 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
288 V{ } filter-mapper-for ; inline
292 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
293 [ pick ] dip swap length over
294 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
296 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
297 pick filter-map-as ; inline
299 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
300 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
302 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
303 [ 1 0 ? ] compose 2map-sum ; inline
305 : round-robin ( seq -- newseq )
307 [ longest length iota ] keep
308 [ [ ?nth ] with map ] curry map concat sift
311 : sift-as ( seq exemplar -- newseq )
314 : sift! ( seq -- newseq )
317 : harvest-as ( seq exemplar -- newseq )
318 [ empty? not ] swap filter-as ;
320 : harvest! ( seq -- newseq )
323 : head-as ( seq n exemplar -- seq' )
324 [ head-slice ] [ like ] bi* ; inline
326 : head*-as ( seq n exemplar -- seq' )
327 [ head-slice* ] [ like ] bi* ; inline
329 : tail-as ( seq n exemplar -- seq' )
330 [ tail-slice ] [ like ] bi* ; inline
332 : tail*-as ( seq n exemplar -- seq' )
333 [ tail-slice* ] [ like ] bi* ; inline
335 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
336 [ trim-slice ] [ like ] bi* ; inline
338 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
339 over empty? [ drop ] [
340 over [ first-unsafe ] [ last-unsafe ] bi pick either?
344 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
345 over empty? [ drop ] [
346 over first-unsafe over call
347 [ trim-head ] [ drop ] if
350 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
351 over empty? [ drop ] [
352 over last-unsafe over call
353 [ trim-tail ] [ drop ] if
356 : unsurround ( newseq seq2 seq3 -- seq1 )
357 [ ?head drop ] [ ?tail drop ] bi* ;
359 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
362 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
364 [ 1 + ] 2dip find-from drop not
365 ] [ 3drop f ] if ; inline
367 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
368 over [ [ (each-index) ] dip collect ] keep ; inline
372 : (2each-index) ( seq1 seq2 quot -- n quot' )
373 [ setup-2each [ keep ] curry ] dip compose ; inline
377 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
378 (2each-index) each-integer ; inline
380 : 2map-into ( seq1 seq2 quot into -- )
381 [ (2each) ] dip collect ; inline
383 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
384 pick [ 2map-into ] keep ; inline
386 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
387 pick [ (2each-index) ] dip map-integers ; inline
389 TUPLE: evens seq length ;
391 : <evens> ( seq -- evens )
392 dup length 1 + 2/ evens boa ; inline
394 M: evens length length>> ; inline
396 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
398 INSTANCE: evens immutable-sequence
400 TUPLE: odds seq length ;
402 : <odds> ( seq -- odds )
403 dup length 2/ odds boa ; inline
405 M: odds length length>> ; inline
407 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
409 INSTANCE: odds immutable-sequence
411 : until-empty ( seq quot -- )
412 [ dup empty? ] swap until drop ; inline
414 : arg-max ( seq -- n )
415 <enum> [ second-unsafe ] supremum-by first ;
417 : arg-min ( seq -- n )
418 <enum> [ second-unsafe ] infimum-by first ;
422 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
423 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
427 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
428 over length <vector> [
429 [ push-index-if ] 2curry each-index
432 : arg-sort ( seq -- indices )
433 zip-index sort-keys values ;
435 : first= ( seq elt -- ? ) [ first ] dip = ; inline
436 : second= ( seq elt -- ? ) [ second ] dip = ; inline
437 : third= ( seq elt -- ? ) [ third ] dip = ; inline
438 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
439 : last= ( seq elt -- ? ) [ last ] dip = ; inline
440 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
442 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
443 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
444 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
445 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
446 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
447 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
449 : loop>sequence ( quot exemplar -- seq )
450 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
452 : loop>array ( quot -- seq )
453 { } loop>sequence ; inline
457 : (reverse) ( seq -- newseq )
458 dup [ length ] keep new-sequence
459 [ 0 swap copy-unsafe ] keep reverse! ;
463 : reverse-as ( seq exemplar -- newseq )
464 [ (reverse) ] [ like ] bi* ;
466 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
467 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
469 : insert-nth! ( elt n seq -- )
470 [ length ] keep ensure swap pick (a,b]
471 over '[ [ 1 + ] keep _ move-unsafe ] each
474 : set-nths ( value indices seq -- )
475 swapd '[ _ swap _ set-nth ] each ; inline
477 : set-nths-unsafe ( value indices seq -- )
478 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
480 : flatten1 ( obj -- seq )
484 [ dup branch? [ % ] [ , ] if ] each
487 ] keep dup branch? [ drop f ] unless make ;
491 : (map-find-index) ( seq quot find-quot -- result i elt )
492 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
493 [ [ [ drop f ] unless ] keep ] dip ; inline
497 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
498 [ find-index ] (map-find-index) ; inline
500 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
502 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
504 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
506 : remove-first ( obj seq -- seq' )
507 [ index ] keep over [ remove-nth ] [ nip ] if ;
509 : remove-first! ( obj seq -- seq )
510 [ index ] keep over [ remove-nth! ] [ nip ] if ;
512 : remove-last ( obj seq -- seq' )
513 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
515 : remove-last! ( obj seq -- seq )
516 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
518 : ?first2 ( seq -- first/f second/f )
521 { 1 [ first-unsafe f ] }
522 [ drop first2-unsafe ]
525 : ?first3 ( seq -- first/f second/f third/f )
528 { 1 [ first-unsafe f f ] }
529 { 2 [ first2-unsafe f ] }
530 [ drop first3-unsafe ]
533 : ?first4 ( seq -- first/f second/f third/f fourth/f )
535 { 0 [ drop f f f f ] }
536 { 1 [ first-unsafe f f f ] }
537 { 2 [ first2-unsafe f f ] }
538 { 3 [ first3-unsafe f ] }
539 [ drop first4-unsafe ]
542 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
543 [ find drop ] 2keep drop swap
544 [ cut ] [ f over like ] if* ; inline
546 : nth* ( n seq -- elt )
547 [ length 1 - swap - ] [ nth ] bi ; inline
549 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
550 -rot (each-index) (each-integer) ; inline
554 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
556 [ keep swap ] curry [ dip ] curry
557 [ [ first 0 ] dip call ] 2keep
558 [ 2curry 3dip 5 npick pick ] curry
560 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
561 ] bi* compose 1 each-index-from nip swap ; inline
565 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
566 [ after? ] select-by* ; inline
568 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
569 [ before? ] select-by* ; inline
571 : change-last ( seq quot -- )
572 [ drop length 1 - ] [ change-nth ] 2bi ; inline
574 : change-last-unsafe ( seq quot -- )
575 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
577 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
578 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
580 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
581 over [ count ] [ length ] bi* / ; inline
583 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
584 [ [ 1 - ] dip find-last-integer ] (find-index) ; inline
586 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
587 [ find-last-index ] (map-find-index) ; inline
589 :: (start-all) ( subseq seq increment -- indices )
591 [ [ subseq seq ] dip start* dup ]
592 [ [ increment + ] keep ] produce nip ;
594 : start-all ( subseq seq -- indices )
595 over length (start-all) ; inline
597 : start-all* ( subseq seq -- indices )
598 1 (start-all) ; inline
600 : count-subseq ( subseq seq -- n )
601 start-all length ; inline
603 : count-subseq* ( subseq seq -- n )
604 start-all* length ; inline
606 : map-zip ( quot: ( x -- y ) -- alist )
607 '[ _ keep swap ] map>alist ; inline