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 [ <enum> ] dip '[ nip @ ] assoc-filter ; inline
27 : reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) i -- ... result )
28 [ swap ] 2dip each-from ; inline
30 :: subseq* ( from to seq -- subseq )
32 from [ dup 0 < [ len + ] when ] [ 0 ] if*
33 to [ dup 0 < [ len + ] when ] [ len ] if*
34 [ 0 len clamp ] bi@ dupd max seq subseq ;
36 : safe-subseq ( from to seq -- subseq )
37 [ length '[ 0 _ clamp ] bi@ ] keep subseq ;
39 : all-subseqs ( seq -- seqs )
40 dup length [1,b] [ clump ] with map concat ;
42 :: each-subseq ( ... seq quot: ( ... x -- ... ) -- ... )
48 from to seq subseq quot call
52 : map-like ( seq exemplar -- seq' )
53 '[ _ like ] map ; inline
55 : filter-all-subseqs-range ( ... seq range quot: ( ... x -- ... ) -- seq )
57 '[ <clumps> _ filter ] with map concat
58 ] 3keep 2drop map-like ; inline
60 : filter-all-subseqs ( ... seq quot: ( ... x -- ... ) -- seq )
61 [ dup length [1,b] ] dip filter-all-subseqs-range ; inline
63 :: longest-subseq ( seq1 seq2 -- subseq )
68 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
72 y 1 - seq2 nth-unsafe = [
73 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
74 len y x table nth-unsafe set-nth-unsafe
75 len n > [ len n! x end! ] when
76 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
78 ] each end n - end seq1 subseq ;
80 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
81 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
83 :: pad-center ( seq n elt -- padded )
84 n seq length [-] :> extra
87 left elt <repetition> seq right elt <repetition>
90 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
91 [ change-nth ] 2curry each ; inline
93 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
94 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
96 : push-if* ( ..a elt quot: ( ..a elt -- ..b obj/f ) accum -- ..b )
97 [ call ] dip [ push ] [ drop ] if* ; inline
101 : (index-selector-as) ( quot length exampler -- selector accum )
102 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
104 : (selector-as*) ( quot length exemplar -- selector accum )
105 new-resizable [ [ push-if* ] 2curry ] keep ; inline
109 : index-selector-as ( quot exemplar -- selector accum )
110 [ length ] keep (index-selector-as) ; inline
112 : index-selector ( quot -- selector accum )
113 V{ } index-selector-as ; inline
115 : selector-as* ( quot exemplar -- selector accum )
116 [ length ] keep (selector-as*) ; inline
118 : selector* ( quot -- selector accum ) V{ } selector-as* ; inline
120 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
121 pick length over [ (index-selector-as) [ each-index ] dip ] 2curry dip like ; inline
123 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
124 over filter-index-as ; inline
126 : even-indices ( seq -- seq' )
127 [ length 1 + 2/ ] keep [
128 [ [ 2 * ] dip nth-unsafe ] curry
129 ] keep map-integers ;
131 : odd-indices ( seq -- seq' )
133 [ [ 2 * 1 + ] dip nth-unsafe ] curry
134 ] keep map-integers ;
136 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
137 [ split-when harvest ] dip join ; inline
139 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
141 [ [ harvest ] dip join ]
142 [ [ first empty? ] dip [ prepend ] curry when ]
143 [ [ last empty? ] dip [ append ] curry when ]
146 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
149 dup seq quot find-from drop
150 [ 2dup = [ 1 + ] when ] [ len ] if*
151 [ seq <slice> ] keep len or swap
152 ] produce nip ; inline
154 : cut-slice* ( seq n -- before after )
155 [ head-slice* ] [ tail-slice* ] 2bi ;
157 : ?<slice> ( from/f to/f sequence -- slice )
158 [ [ 0 ] unless* ] 2dip
159 over [ nip [ length ] [ ] bi ] unless
162 : sequence>slice ( sequence -- slice )
163 [ drop 0 ] [ length ] [ ] tri <slice> ; inline
165 : slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
166 2dup [ from>> ] bi@ > [ swap ] when ; inline
168 : ordered-slices-range ( slice-lt slice-gt -- to from )
169 [ to>> ] [ from>> ] bi* ;
171 : unordered-slices-range ( slice1 slice2 -- to from )
172 slice-order-by-from ordered-slices-range ;
174 : ordered-slices-overlap? ( slice-lt slice-gt -- ? )
175 ordered-slices-range > ; inline
177 : unordered-slices-overlap? ( slice1 slice2 -- ? )
178 unordered-slices-range > ; inline
180 : slices-overlap? ( slice1 slice2 -- ? )
181 unordered-slices-overlap? ;
183 : ordered-slices-touch? ( slice-lt slice-gt -- ? )
184 ordered-slices-range >= ; inline
186 : unordered-slices-touch? ( slice1 slice2 -- ? )
187 unordered-slices-range >= ; inline
189 : slices-touch? ( slice1 slice2 -- ? )
190 unordered-slices-touch? ;
192 ERROR: slices-don't-touch slice1 slice2 ;
194 : merge-slices ( slice1 slice2 -- slice/* )
196 2dup ordered-slices-touch? [
197 [ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
202 : rotate ( seq n -- seq' )
203 over length mod dup 0 >= [ cut ] [ abs cut* ] if prepend ;
205 ERROR: underlying-mismatch slice1 slice2 ;
206 : ensure-same-underlying ( slice1 slice2 -- slice1 slice2 )
207 2dup [ seq>> ] bi@ eq? [ underlying-mismatch ] unless ;
209 : span-slices ( slice1 slice2 -- slice )
210 ensure-same-underlying
211 [ [ from>> ] bi@ min ]
213 [ drop seq>> ] 2tri <slice> ;
215 : ?span-slices ( slice1/f slice2/f -- slice )
216 2dup and [ span-slices ] [ or ] if ;
218 :: rotate! ( seq n -- )
220 n len mod dup 0 < [ len + ] when seq bounds-check drop 0 over
222 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
223 dup len = [ drop over ] when
224 2over = [ -rot nip over ] when
227 : all-rotations ( seq -- seq' )
228 dup length iota [ rotate ] with map ;
232 : (appender-for) ( quot length exemplar -- appender accum )
233 new-resizable [ [ push-all ] curry compose ] keep ; inline
237 : appender-for ( quot exemplar -- appender accum )
238 [ length ] keep (appender-for) ; inline
240 : appender ( quot -- appender accum )
241 V{ } appender-for ; inline
243 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
244 [ appender-for [ each ] dip ] keep like ; inline
246 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
247 [ length ] keep [ new-resizable ] [ append! ] bi ;
249 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
250 over empty? [ 2drop { } ] [
251 [ [ first ] dip call ] 2keep rot dup [
252 >resizable [ [ push-all ] curry compose ] keep
253 [ 1 ] 3dip [ setup-each (each-integer) ] dip
257 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
258 [ pick ] dip swap length over
259 [ (selector-as) [ compose each ] dip ] 2curry dip like ; inline
261 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
262 pick map-filter-as ; inline
264 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
265 [ ] map-filter ; inline
267 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
268 [ empty? not ] map-filter ; inline
272 : (setup-each-from) ( i seq -- n quot )
273 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
275 : setup-each-from ( i seq quot -- n quot' )
276 [ (setup-each-from) ] dip compose ; inline
280 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
281 [ -rot setup-each-from ] dip map-integers ; inline
283 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
284 pick map-from-as ; inline
288 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
289 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
291 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
292 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
294 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
295 [ length ] keep (filter-mapper-for) ; inline
297 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
298 V{ } filter-mapper-for ; inline
302 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
303 [ pick ] dip swap length over
304 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
306 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
307 pick filter-map-as ; inline
309 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
310 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
312 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
313 [ 1 0 ? ] compose 2map-sum ; inline
315 : round-robin ( seq -- newseq )
317 [ longest length iota ] keep
318 [ [ ?nth ] with map ] curry map concat sift
321 : sift-as ( seq exemplar -- newseq )
324 : sift! ( seq -- newseq )
327 : harvest-as ( seq exemplar -- newseq )
328 [ empty? not ] swap filter-as ;
330 : harvest! ( seq -- newseq )
333 : head-as ( seq n exemplar -- seq' )
334 [ head-slice ] [ like ] bi* ; inline
336 : head*-as ( seq n exemplar -- seq' )
337 [ head-slice* ] [ like ] bi* ; inline
339 : tail-as ( seq n exemplar -- seq' )
340 [ tail-slice ] [ like ] bi* ; inline
342 : tail*-as ( seq n exemplar -- seq' )
343 [ tail-slice* ] [ like ] bi* ; inline
345 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
346 [ trim-slice ] [ like ] bi* ; inline
348 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
349 over empty? [ drop ] [
350 over [ first-unsafe ] [ last-unsafe ] bi pick either?
354 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
355 over empty? [ drop ] [
356 over first-unsafe over call
357 [ trim-head ] [ drop ] if
360 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
361 over empty? [ drop ] [
362 over last-unsafe over call
363 [ trim-tail ] [ drop ] if
366 : unsurround ( newseq seq2 seq3 -- seq1 )
367 [ ?head drop ] [ ?tail drop ] bi* ;
369 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
372 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
374 [ 1 + ] 2dip find-from drop not
375 ] [ 3drop f ] if ; inline
377 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
378 over [ [ (each-index) ] dip collect ] keep ; inline
382 : (2each-index) ( seq1 seq2 quot -- n quot' )
383 [ setup-2each [ keep ] curry ] dip compose ; inline
387 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
388 (2each-index) each-integer ; inline
390 : 2map-into ( seq1 seq2 quot into -- )
391 [ (2each) ] dip collect ; inline
393 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
394 pick [ 2map-into ] keep ; inline
396 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
397 pick [ (2each-index) ] dip map-integers ; inline
399 TUPLE: evens seq length ;
401 : <evens> ( seq -- evens )
402 dup length 1 + 2/ evens boa ; inline
404 M: evens length length>> ; inline
406 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
408 INSTANCE: evens immutable-sequence
410 TUPLE: odds seq length ;
412 : <odds> ( seq -- odds )
413 dup length 2/ odds boa ; inline
415 M: odds length length>> ; inline
417 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
419 INSTANCE: odds immutable-sequence
421 : until-empty ( seq quot -- )
422 [ dup empty? ] swap until drop ; inline
424 : arg-max ( seq -- n )
425 <enum> [ second-unsafe ] supremum-by first ;
427 : arg-min ( seq -- n )
428 <enum> [ second-unsafe ] infimum-by first ;
432 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
433 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
437 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
438 over length <vector> [
439 [ push-index-if ] 2curry each-index
442 : arg-sort ( seq -- indices )
443 zip-index sort-keys values ;
445 : first= ( seq elt -- ? ) [ first ] dip = ; inline
446 : second= ( seq elt -- ? ) [ second ] dip = ; inline
447 : third= ( seq elt -- ? ) [ third ] dip = ; inline
448 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
449 : last= ( seq elt -- ? ) [ last ] dip = ; inline
450 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
452 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
453 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
454 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
455 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
456 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
457 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
459 : loop>sequence ( quot exemplar -- seq )
460 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
462 : loop>array ( quot -- seq )
463 { } loop>sequence ; inline
467 : (reverse) ( seq -- newseq )
468 dup [ length ] keep new-sequence
469 [ 0 swap copy-unsafe ] keep reverse! ;
473 : reverse-as ( seq exemplar -- newseq )
474 [ (reverse) ] [ like ] bi* ;
476 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
477 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
479 : insert-nth! ( elt n seq -- )
480 [ length ] keep ensure swap pick (a,b]
481 over '[ [ 1 + ] keep _ move-unsafe ] each
484 : set-nths ( value indices seq -- )
485 swapd '[ _ swap _ set-nth ] each ; inline
487 : set-nths-unsafe ( value indices seq -- )
488 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
490 : flatten1 ( obj -- seq )
494 [ dup branch? [ % ] [ , ] if ] each
497 ] keep dup branch? [ drop f ] unless make ;
501 : (map-find-index) ( seq quot find-quot -- result i elt )
502 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
503 [ [ [ drop f ] unless ] keep ] dip ; inline
507 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
508 [ find-index ] (map-find-index) ; inline
510 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
512 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
514 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
516 : remove-first ( obj seq -- seq' )
517 [ index ] keep over [ remove-nth ] [ nip ] if ;
519 : remove-first! ( obj seq -- seq )
520 [ index ] keep over [ remove-nth! ] [ nip ] if ;
522 : remove-last ( obj seq -- seq' )
523 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
525 : remove-last! ( obj seq -- seq )
526 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
528 : ?first2 ( seq -- first/f second/f )
531 { 1 [ first-unsafe f ] }
532 [ drop first2-unsafe ]
535 : ?first3 ( seq -- first/f second/f third/f )
538 { 1 [ first-unsafe f f ] }
539 { 2 [ first2-unsafe f ] }
540 [ drop first3-unsafe ]
543 : ?first4 ( seq -- first/f second/f third/f fourth/f )
545 { 0 [ drop f f f f ] }
546 { 1 [ first-unsafe f f f ] }
547 { 2 [ first2-unsafe f f ] }
548 { 3 [ first3-unsafe f ] }
549 [ drop first4-unsafe ]
552 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
553 [ find drop ] 2keep drop swap
554 [ cut ] [ f over like ] if* ; inline
556 : nth* ( n seq -- elt )
557 [ length 1 - swap - ] [ nth ] bi ; inline
559 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
560 -rot (each-index) (each-integer) ; inline
564 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
566 [ keep swap ] curry [ dip ] curry
567 [ [ first 0 ] dip call ] 2keep
568 [ 2curry 3dip 5 npick pick ] curry
570 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
571 ] bi* compose 1 each-index-from nip swap ; inline
575 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
576 [ after? ] select-by* ; inline
578 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
579 [ before? ] select-by* ; inline
581 : change-last ( seq quot -- )
582 [ drop length 1 - ] [ change-nth ] 2bi ; inline
584 : change-last-unsafe ( seq quot -- )
585 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
587 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
588 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
590 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
591 over [ count ] [ length ] bi* / ; inline
593 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
594 [ [ 1 - ] dip find-last-integer ] (find-index) ; inline
596 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
597 [ find-last-index ] (map-find-index) ; inline
599 :: (start-all) ( subseq seq increment -- indices )
601 [ [ subseq seq ] dip start* dup ]
602 [ [ increment + ] keep ] produce nip ;
604 : start-all ( subseq seq -- indices )
605 over length (start-all) ; inline
607 : start-all* ( subseq seq -- indices )
608 1 (start-all) ; inline
610 : count-subseq ( subseq seq -- n )
611 start-all length ; inline
613 : count-subseq* ( subseq seq -- n )
614 start-all* length ; inline
616 : map-zip ( quot: ( x -- y ) -- alist )
617 '[ _ keep swap ] map>alist ; inline
619 : map-keys ( assoc quot: ( key -- key' ) -- assoc )
620 '[ _ dip ] assoc-map ; inline
622 : map-values ( assoc quot: ( value -- value' ) -- assoc )
623 '[ swap _ dip swap ] assoc-map ; inline