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/f to/f sequence -- slice )
153 [ [ 0 ] unless* ] 2dip
154 over [ nip [ length ] [ ] bi ] unless
157 : sequence>slice ( sequence -- slice )
158 [ drop 0 ] [ length ] [ ] tri <slice> ; inline
160 : slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
161 2dup [ from>> ] bi@ > [ swap ] when ; inline
163 : ordered-slices-range ( slice-lt slice-gt -- to from )
164 [ to>> ] [ from>> ] bi* ;
166 : unordered-slices-range ( slice1 slice2 -- to from )
167 slice-order-by-from ordered-slices-range ;
169 : ordered-slices-overlap? ( slice-lt slice-gt -- ? )
170 ordered-slices-range > ; inline
172 : unordered-slices-overlap? ( slice1 slice2 -- ? )
173 unordered-slices-range > ; inline
175 : slices-overlap? ( slice1 slice2 -- ? )
176 unordered-slices-overlap? ;
178 : ordered-slices-touch? ( slice-lt slice-gt -- ? )
179 ordered-slices-range >= ; inline
181 : unordered-slices-touch? ( slice1 slice2 -- ? )
182 unordered-slices-range >= ; inline
184 : slices-touch? ( slice1 slice2 -- ? )
185 unordered-slices-touch? ;
187 ERROR: slices-don't-touch slice1 slice2 ;
189 : merge-slices ( slice1 slice2 -- slice/* )
191 2dup ordered-slices-touch? [
192 [ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
197 : rotate ( seq n -- seq' )
198 over length mod dup 0 >= [ cut ] [ abs cut* ] if prepend ;
200 ERROR: underlying-mismatch slice1 slice2 ;
201 : ensure-same-underlying ( slice1 slice2 -- slice1 slice2 )
202 2dup [ seq>> ] bi@ eq? [ underlying-mismatch ] unless ;
204 : span-slices ( slice1 slice2 -- slice )
205 ensure-same-underlying
206 [ [ from>> ] bi@ min ]
208 [ drop seq>> ] 2tri <slice> ;
210 :: rotate! ( seq n -- )
212 n len mod dup 0 < [ len + ] when seq bounds-check drop 0 over
214 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
215 dup len = [ drop over ] when
216 2over = [ -rot nip over ] when
219 : all-rotations ( seq -- seq' )
220 dup length iota [ rotate ] with map ;
224 : (appender-for) ( quot length exemplar -- appender accum )
225 new-resizable [ [ push-all ] curry compose ] keep ; inline
229 : appender-for ( quot exemplar -- appender accum )
230 [ length ] keep (appender-for) ; inline
232 : appender ( quot -- appender accum )
233 V{ } appender-for ; inline
235 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
236 [ appender-for [ each ] dip ] keep like ; inline
238 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
239 [ length ] keep [ new-resizable ] [ append! ] bi ;
241 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
242 over empty? [ 2drop { } ] [
243 [ [ first ] dip call ] 2keep rot dup [
244 >resizable [ [ push-all ] curry compose ] keep
245 [ 1 ] 3dip [ setup-each (each-integer) ] dip
249 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
250 [ pick ] dip swap length over
251 [ (selector-for) [ compose each ] dip ] 2curry dip like ; inline
253 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
254 pick map-filter-as ; inline
256 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
257 [ ] map-filter ; inline
259 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
260 [ empty? not ] map-filter ; inline
264 : (setup-each-from) ( i seq -- n quot )
265 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
267 : setup-each-from ( i seq quot -- n quot' )
268 [ (setup-each-from) ] dip compose ; inline
272 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
273 [ -rot setup-each-from ] dip map-integers ; inline
275 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
276 pick map-from-as ; inline
280 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
281 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
283 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
284 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
286 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
287 [ length ] keep (filter-mapper-for) ; inline
289 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
290 V{ } filter-mapper-for ; inline
294 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
295 [ pick ] dip swap length over
296 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
298 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
299 pick filter-map-as ; inline
301 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
302 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
304 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
305 [ 1 0 ? ] compose 2map-sum ; inline
307 : round-robin ( seq -- newseq )
309 [ longest length iota ] keep
310 [ [ ?nth ] with map ] curry map concat sift
313 : sift-as ( seq exemplar -- newseq )
316 : sift! ( seq -- newseq )
319 : harvest-as ( seq exemplar -- newseq )
320 [ empty? not ] swap filter-as ;
322 : harvest! ( seq -- newseq )
325 : head-as ( seq n exemplar -- seq' )
326 [ head-slice ] [ like ] bi* ; inline
328 : head*-as ( seq n exemplar -- seq' )
329 [ head-slice* ] [ like ] bi* ; inline
331 : tail-as ( seq n exemplar -- seq' )
332 [ tail-slice ] [ like ] bi* ; inline
334 : tail*-as ( seq n exemplar -- seq' )
335 [ tail-slice* ] [ like ] bi* ; inline
337 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
338 [ trim-slice ] [ like ] bi* ; inline
340 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
341 over empty? [ drop ] [
342 over [ first-unsafe ] [ last-unsafe ] bi pick either?
346 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
347 over empty? [ drop ] [
348 over first-unsafe over call
349 [ trim-head ] [ drop ] if
352 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
353 over empty? [ drop ] [
354 over last-unsafe over call
355 [ trim-tail ] [ drop ] if
358 : unsurround ( newseq seq2 seq3 -- seq1 )
359 [ ?head drop ] [ ?tail drop ] bi* ;
361 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
364 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
366 [ 1 + ] 2dip find-from drop not
367 ] [ 3drop f ] if ; inline
369 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
370 over [ [ (each-index) ] dip collect ] keep ; inline
374 : (2each-index) ( seq1 seq2 quot -- n quot' )
375 [ setup-2each [ keep ] curry ] dip compose ; inline
379 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
380 (2each-index) each-integer ; inline
382 : 2map-into ( seq1 seq2 quot into -- )
383 [ (2each) ] dip collect ; inline
385 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
386 pick [ 2map-into ] keep ; inline
388 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
389 pick [ (2each-index) ] dip map-integers ; inline
391 TUPLE: evens seq length ;
393 : <evens> ( seq -- evens )
394 dup length 1 + 2/ evens boa ; inline
396 M: evens length length>> ; inline
398 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
400 INSTANCE: evens immutable-sequence
402 TUPLE: odds seq length ;
404 : <odds> ( seq -- odds )
405 dup length 2/ odds boa ; inline
407 M: odds length length>> ; inline
409 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
411 INSTANCE: odds immutable-sequence
413 : until-empty ( seq quot -- )
414 [ dup empty? ] swap until drop ; inline
416 : arg-max ( seq -- n )
417 <enum> [ second-unsafe ] supremum-by first ;
419 : arg-min ( seq -- n )
420 <enum> [ second-unsafe ] infimum-by first ;
424 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
425 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
429 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
430 over length <vector> [
431 [ push-index-if ] 2curry each-index
434 : arg-sort ( seq -- indices )
435 zip-index sort-keys values ;
437 : first= ( seq elt -- ? ) [ first ] dip = ; inline
438 : second= ( seq elt -- ? ) [ second ] dip = ; inline
439 : third= ( seq elt -- ? ) [ third ] dip = ; inline
440 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
441 : last= ( seq elt -- ? ) [ last ] dip = ; inline
442 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
444 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
445 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
446 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
447 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
448 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
449 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
451 : loop>sequence ( quot exemplar -- seq )
452 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
454 : loop>array ( quot -- seq )
455 { } loop>sequence ; inline
459 : (reverse) ( seq -- newseq )
460 dup [ length ] keep new-sequence
461 [ 0 swap copy-unsafe ] keep reverse! ;
465 : reverse-as ( seq exemplar -- newseq )
466 [ (reverse) ] [ like ] bi* ;
468 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
469 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
471 : insert-nth! ( elt n seq -- )
472 [ length ] keep ensure swap pick (a,b]
473 over '[ [ 1 + ] keep _ move-unsafe ] each
476 : set-nths ( value indices seq -- )
477 swapd '[ _ swap _ set-nth ] each ; inline
479 : set-nths-unsafe ( value indices seq -- )
480 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
482 : flatten1 ( obj -- seq )
486 [ dup branch? [ % ] [ , ] if ] each
489 ] keep dup branch? [ drop f ] unless make ;
493 : (map-find-index) ( seq quot find-quot -- result i elt )
494 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
495 [ [ [ drop f ] unless ] keep ] dip ; inline
499 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
500 [ find-index ] (map-find-index) ; inline
502 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
504 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
506 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
508 : remove-first ( obj seq -- seq' )
509 [ index ] keep over [ remove-nth ] [ nip ] if ;
511 : remove-first! ( obj seq -- seq )
512 [ index ] keep over [ remove-nth! ] [ nip ] if ;
514 : remove-last ( obj seq -- seq' )
515 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
517 : remove-last! ( obj seq -- seq )
518 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
520 : ?first2 ( seq -- first/f second/f )
523 { 1 [ first-unsafe f ] }
524 [ drop first2-unsafe ]
527 : ?first3 ( seq -- first/f second/f third/f )
530 { 1 [ first-unsafe f f ] }
531 { 2 [ first2-unsafe f ] }
532 [ drop first3-unsafe ]
535 : ?first4 ( seq -- first/f second/f third/f fourth/f )
537 { 0 [ drop f f f f ] }
538 { 1 [ first-unsafe f f f ] }
539 { 2 [ first2-unsafe f f ] }
540 { 3 [ first3-unsafe f ] }
541 [ drop first4-unsafe ]
544 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
545 [ find drop ] 2keep drop swap
546 [ cut ] [ f over like ] if* ; inline
548 : nth* ( n seq -- elt )
549 [ length 1 - swap - ] [ nth ] bi ; inline
551 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
552 -rot (each-index) (each-integer) ; inline
556 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
558 [ keep swap ] curry [ dip ] curry
559 [ [ first 0 ] dip call ] 2keep
560 [ 2curry 3dip 5 npick pick ] curry
562 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
563 ] bi* compose 1 each-index-from nip swap ; inline
567 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
568 [ after? ] select-by* ; inline
570 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
571 [ before? ] select-by* ; inline
573 : change-last ( seq quot -- )
574 [ drop length 1 - ] [ change-nth ] 2bi ; inline
576 : change-last-unsafe ( seq quot -- )
577 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
579 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
580 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
582 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
583 over [ count ] [ length ] bi* / ; inline
585 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
586 [ [ 1 - ] dip find-last-integer ] (find-index) ; inline
588 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
589 [ find-last-index ] (map-find-index) ; inline
591 :: (start-all) ( subseq seq increment -- indices )
593 [ [ subseq seq ] dip start* dup ]
594 [ [ increment + ] keep ] produce nip ;
596 : start-all ( subseq seq -- indices )
597 over length (start-all) ; inline
599 : start-all* ( subseq seq -- indices )
600 1 (start-all) ; inline
602 : count-subseq ( subseq seq -- n )
603 start-all length ; inline
605 : count-subseq* ( subseq seq -- n )
606 start-all* length ; inline
608 : map-zip ( quot: ( x -- y ) -- alist )
609 '[ _ keep swap ] map>alist ; inline