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 : subseq-as ( from to seq exemplar -- subseq )
55 [ check-slice subseq>copy (copy) ] dip like ;
57 : map-like ( seq exemplar -- seq' )
58 '[ _ like ] map ; inline
60 : filter-all-subseqs-range ( ... seq range quot: ( ... x -- ... ) -- seq )
62 '[ <clumps> _ filter ] with map concat
63 ] 3keep 2drop map-like ; inline
65 : filter-all-subseqs ( ... seq quot: ( ... x -- ... ) -- seq )
66 [ dup length [1,b] ] dip filter-all-subseqs-range ; inline
68 :: longest-subseq ( seq1 seq2 -- subseq )
73 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
77 y 1 - seq2 nth-unsafe = [
78 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
79 len y x table nth-unsafe set-nth-unsafe
80 len n > [ len n! x end! ] when
81 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
83 ] each end n - end seq1 subseq ;
85 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
86 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
88 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
89 [ change-nth ] 2curry each ; inline
91 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
92 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
94 : push-if* ( ..a elt quot: ( ..a elt -- ..b obj/f ) accum -- ..b )
95 [ call ] dip [ push ] [ drop ] if* ; inline
99 : (index-selector-for) ( quot length exampler -- selector accum )
100 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
102 : (selector-for*) ( quot length exemplar -- selector accum )
103 new-resizable [ [ push-if* ] 2curry ] keep ; inline
107 : index-selector-for ( quot exemplar -- selector accum )
108 [ length ] keep (index-selector-for) ; inline
110 : index-selector ( quot -- selector accum )
111 V{ } index-selector-for ; inline
113 : selector-for* ( quot exemplar -- selector accum )
114 [ length ] keep (selector-for*) ; inline
116 : selector* ( quot -- selector accum ) V{ } selector-for* ; inline
118 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
119 pick length over [ (index-selector-for) [ each-index ] dip ] 2curry dip like ; inline
121 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
122 over filter-index-as ; inline
124 : even-indices ( seq -- seq' )
125 [ length 1 + 2/ ] keep [
126 [ [ 2 * ] dip nth-unsafe ] curry
127 ] keep map-integers ;
129 : odd-indices ( seq -- seq' )
131 [ [ 2 * 1 + ] dip nth-unsafe ] curry
132 ] keep map-integers ;
134 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
135 [ split-when harvest ] dip join ; inline
137 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
139 [ [ harvest ] dip join ]
140 [ [ first empty? ] dip [ prepend ] curry when ]
141 [ [ last empty? ] dip [ append ] curry when ]
144 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
147 dup seq quot find-from drop
148 [ 2dup = [ 1 + ] when ] [ len ] if*
149 [ seq <slice> ] keep len or swap
150 ] produce nip ; inline
152 : cut-slice* ( seq n -- before after )
153 [ head-slice* ] [ tail-slice* ] 2bi ;
155 : ?<slice> ( from to/f sequence -- slice )
156 over [ nip [ length ] [ ] bi ] unless <slice> ; inline
158 : sequence>slice ( sequence -- slice )
159 [ drop 0 ] [ length ] [ ] tri <slice> ; inline
161 : slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
162 2dup [ from>> ] bi@ > [ swap ] when ; inline
164 : ordered-slices-range ( slice-lt slice-gt -- to from )
165 [ to>> ] [ from>> ] bi* ;
167 : unordered-slices-range ( slice1 slice2 -- to from )
168 slice-order-by-from ordered-slices-range ;
170 : ordered-slices-overlap? ( slice-lt slice-gt -- ? )
171 ordered-slices-range > ; inline
173 : unordered-slices-overlap? ( slice1 slice2 -- ? )
174 unordered-slices-range > ; inline
176 : slices-overlap? ( slice1 slice2 -- ? )
177 unordered-slices-overlap? ;
179 : ordered-slices-touch? ( slice-lt slice-gt -- ? )
180 ordered-slices-range >= ; inline
182 : unordered-slices-touch? ( slice1 slice2 -- ? )
183 unordered-slices-range >= ; inline
185 : slices-touch? ( slice1 slice2 -- ? )
186 unordered-slices-touch? ;
188 ERROR: slices-don't-touch slice1 slice2 ;
190 : merge-slices ( slice1 slice2 -- slice/* )
192 2dup ordered-slices-touch? [
193 [ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
198 : rotate ( seq n -- seq' )
201 :: rotate! ( seq n -- )
202 n seq bounds-check length :> end
204 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
205 dup end = [ drop over ] when
206 2over = [ -rot nip over ] when
209 : all-rotations ( seq -- seq' )
210 dup length iota [ rotate ] with map ;
214 : (appender-for) ( quot length exemplar -- appender accum )
215 new-resizable [ [ push-all ] curry compose ] keep ; inline
219 : appender-for ( quot exemplar -- appender accum )
220 [ length ] keep (appender-for) ; inline
222 : appender ( quot -- appender accum )
223 V{ } appender-for ; inline
225 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
226 [ appender-for [ each ] dip ] keep like ; inline
228 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
229 [ length ] keep [ new-resizable ] [ append! ] bi ;
231 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
232 over empty? [ 2drop { } ] [
233 [ [ first ] dip call ] 2keep rot dup [
234 >resizable [ [ push-all ] curry compose ] keep
235 [ 1 ] 3dip [ setup-each (each-integer) ] dip
239 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
240 [ pick ] dip swap length over
241 [ (selector-for) [ compose each ] dip ] 2curry dip like ; inline
243 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
244 pick map-filter-as ; inline
246 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
247 [ ] map-filter ; inline
249 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
250 [ empty? not ] map-filter ; inline
254 : (setup-each-from) ( i seq -- n quot )
255 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
257 : setup-each-from ( i seq quot -- n quot' )
258 [ (setup-each-from) ] dip compose ; inline
262 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
263 [ -rot setup-each-from ] dip map-integers ; inline
265 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
266 pick map-from-as ; inline
270 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
271 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
273 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
274 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
276 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
277 [ length ] keep (filter-mapper-for) ; inline
279 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
280 V{ } filter-mapper-for ; inline
284 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
285 [ pick ] dip swap length over
286 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
288 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
289 pick filter-map-as ; inline
291 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
292 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
294 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
295 [ 1 0 ? ] compose 2map-sum ; inline
297 : round-robin ( seq -- newseq )
299 [ longest length iota ] keep
300 [ [ ?nth ] with map ] curry map concat sift
303 : sift-as ( seq exemplar -- newseq )
306 : sift! ( seq -- newseq )
309 : harvest-as ( seq exemplar -- newseq )
310 [ empty? not ] swap filter-as ;
312 : harvest! ( seq -- newseq )
315 : head-as ( seq n exemplar -- seq' )
316 [ head-slice ] [ like ] bi* ; inline
318 : head*-as ( seq n exemplar -- seq' )
319 [ head-slice* ] [ like ] bi* ; inline
321 : tail-as ( seq n exemplar -- seq' )
322 [ tail-slice ] [ like ] bi* ; inline
324 : tail*-as ( seq n exemplar -- seq' )
325 [ tail-slice* ] [ like ] bi* ; inline
327 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
328 [ trim-slice ] [ like ] bi* ; inline
330 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
331 over empty? [ drop ] [
332 over [ first-unsafe ] [ last-unsafe ] bi pick either?
336 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
337 over empty? [ drop ] [
338 over first-unsafe over call
339 [ trim-head ] [ drop ] if
342 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
343 over empty? [ drop ] [
344 over last-unsafe over call
345 [ trim-tail ] [ drop ] if
348 : unsurround ( newseq seq2 seq3 -- seq1 )
349 [ ?head drop ] [ ?tail drop ] bi* ;
351 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
354 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
356 [ 1 + ] 2dip find-from drop not
357 ] [ 3drop f ] if ; inline
359 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
360 over [ [ (each-index) ] dip collect ] keep ; inline
364 : (2each-index) ( seq1 seq2 quot -- n quot' )
365 [ setup-2each [ keep ] curry ] dip compose ; inline
369 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
370 (2each-index) each-integer ; inline
372 : 2map-into ( seq1 seq2 quot into -- )
373 [ (2each) ] dip collect ; inline
375 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
376 pick [ 2map-into ] keep ; inline
378 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
379 pick [ (2each-index) ] dip map-integers ; inline
381 TUPLE: evens seq length ;
383 : <evens> ( seq -- evens )
384 dup length 1 + 2/ evens boa ; inline
386 M: evens length length>> ; inline
388 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
390 INSTANCE: evens immutable-sequence
392 TUPLE: odds seq length ;
394 : <odds> ( seq -- odds )
395 dup length 2/ odds boa ; inline
397 M: odds length length>> ; inline
399 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
401 INSTANCE: odds immutable-sequence
403 : until-empty ( seq quot -- )
404 [ dup empty? ] swap until drop ; inline
406 : arg-max ( seq -- n )
407 <enum> [ second-unsafe ] supremum-by first ;
409 : arg-min ( seq -- n )
410 <enum> [ second-unsafe ] infimum-by first ;
414 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
415 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
419 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
420 over length <vector> [
421 [ push-index-if ] 2curry each-index
424 : arg-sort ( seq -- indices )
425 zip-index sort-keys values ;
427 : first= ( seq elt -- ? ) [ first ] dip = ; inline
428 : second= ( seq elt -- ? ) [ second ] dip = ; inline
429 : third= ( seq elt -- ? ) [ third ] dip = ; inline
430 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
431 : last= ( seq elt -- ? ) [ last ] dip = ; inline
432 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
434 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
435 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
436 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
437 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
438 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
439 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
441 : loop>sequence ( quot exemplar -- seq )
442 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
444 : loop>array ( quot -- seq )
445 { } loop>sequence ; inline
449 : (reverse) ( seq -- newseq )
450 dup [ length ] keep new-sequence
451 [ 0 swap copy-unsafe ] keep reverse! ;
455 : reverse-as ( seq exemplar -- newseq )
456 [ (reverse) ] [ like ] bi* ;
458 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
459 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
461 : insert-nth! ( elt n seq -- )
462 [ length ] keep ensure swap pick (a,b]
463 over '[ [ 1 + ] keep _ move-unsafe ] each
466 : set-nths ( value indices seq -- )
467 swapd '[ _ swap _ set-nth ] each ; inline
469 : set-nths-unsafe ( value indices seq -- )
470 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
472 : flatten1 ( obj -- seq )
476 [ dup branch? [ % ] [ , ] if ] each
479 ] keep dup branch? [ drop f ] unless make ;
483 : (map-find-index) ( seq quot find-quot -- result i elt )
484 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
485 [ [ [ drop f ] unless ] keep ] dip ; inline
489 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
490 [ find-index ] (map-find-index) ; inline
492 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
494 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
496 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
498 : remove-first ( obj seq -- seq' )
499 [ index ] keep over [ remove-nth ] [ nip ] if ;
501 : remove-first! ( obj seq -- seq )
502 [ index ] keep over [ remove-nth! ] [ nip ] if ;
504 : remove-last ( obj seq -- seq' )
505 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
507 : remove-last! ( obj seq -- seq )
508 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
510 : ?first2 ( seq -- first/f second/f )
513 { 1 [ first-unsafe f ] }
514 [ drop first2-unsafe ]
517 : ?first3 ( seq -- first/f second/f third/f )
520 { 1 [ first-unsafe f f ] }
521 { 2 [ first2-unsafe f ] }
522 [ drop first3-unsafe ]
525 : ?first4 ( seq -- first/f second/f third/f fourth/f )
527 { 0 [ drop f f f f ] }
528 { 1 [ first-unsafe f f f ] }
529 { 2 [ first2-unsafe f f ] }
530 { 3 [ first3-unsafe f ] }
531 [ drop first4-unsafe ]
534 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
535 [ find drop ] 2keep drop swap
536 [ cut ] [ f over like ] if* ; inline
538 : nth* ( n seq -- elt )
539 [ length 1 - swap - ] [ nth ] bi ; inline
541 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
542 -rot (each-index) (each-integer) ; inline
546 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
548 [ keep swap ] curry [ dip ] curry
549 [ [ first 0 ] dip call ] 2keep
550 [ 2curry 3dip 5 npick pick ] curry
552 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
553 ] bi* compose 1 each-index-from nip swap ; inline
557 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
558 [ after? ] select-by* ; inline
560 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
561 [ before? ] select-by* ; inline
563 : change-last ( seq quot -- )
564 [ drop length 1 - ] [ change-nth ] 2bi ; inline
566 : change-last-unsafe ( seq quot -- )
567 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
569 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
570 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
572 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
573 over [ count ] [ length ] bi* / ; inline
575 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
576 [ [ 1 - ] dip find-last-integer ] (find-index) ; inline
578 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
579 [ find-last-index ] (map-find-index) ; inline
581 :: (start-all) ( subseq seq increment -- indices )
583 [ [ subseq seq ] dip start* dup ]
584 [ [ increment + ] keep ] produce nip ;
586 : start-all ( subseq seq -- indices )
587 over length (start-all) ; inline
589 : start-all* ( subseq seq -- indices )
590 1 (start-all) ; inline
592 : count-subseq ( subseq seq -- n )
593 start-all length ; inline
595 : count-subseq* ( subseq seq -- n )
596 start-all* length ; inline
598 : map-zip ( quot: ( x -- y ) -- alist )
599 '[ _ keep swap ] map>alist ; inline