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
5 FROM: sequences => change-nth ;
8 : reduce1 ( seq quot -- result ) [ unclip ] dip reduce ; inline
10 :: reduce-r ( seq identity quot: ( obj1 obj2 -- obj ) -- result )
12 unclip [ identity quot reduce-r ] [ quot call ] bi*
13 ] if-empty ; inline recursive
15 ! Quot must have static stack effect, unlike "reduce"
16 :: reduce* ( seq identity quot: ( prev elt -- next ) -- result )
18 unclip identity swap quot call( prev elt -- next )
20 ] if-empty ; inline recursive
22 :: combos ( list1 list2 -- result )
23 list2 [ [ 2array ] curry list1 swap map ] map concat ;
25 : find-all ( seq quot: ( elt -- ? ) -- elts )
26 [ [ length iota ] keep ] dip
27 [ dupd call( a -- ? ) [ 2array ] [ 2drop f ] if ] curry
30 : reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) i -- ... result )
31 [ swap ] 2dip each-from ; inline
33 :: subseq* ( from to seq -- subseq )
35 from [ dup 0 < [ len + ] when ] [ 0 ] if*
36 to [ dup 0 < [ len + ] when ] [ len ] if*
37 [ 0 len clamp ] bi@ dupd max seq subseq ;
39 : safe-subseq ( from to seq -- subseq )
40 [ length '[ 0 _ clamp ] bi@ ] keep subseq ;
42 : all-subseqs ( seq -- seqs )
43 dup length [1,b] [ clump ] with map concat ;
45 :: each-subseq ( ... seq quot: ( ... x -- ... ) -- ... )
51 from to seq subseq quot call
55 : subseq-as ( from to seq exemplar -- subseq )
56 [ check-slice subseq>copy (copy) ] dip like ;
58 : map-like ( seq exemplar -- seq' )
59 '[ _ like ] map ; inline
61 : filter-all-subseqs-range ( ... seq range quot: ( ... x -- ... ) -- seq )
63 '[ <clumps> _ filter ] with map concat
64 ] 3keep 2drop map-like ; inline
66 : filter-all-subseqs ( ... seq quot: ( ... x -- ... ) -- seq )
67 [ dup length [1,b] ] dip filter-all-subseqs-range ; inline
69 :: longest-subseq ( seq1 seq2 -- subseq )
74 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
78 y 1 - seq2 nth-unsafe = [
79 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
80 len y x table nth-unsafe set-nth-unsafe
81 len n > [ len n! x end! ] when
82 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
84 ] each end n - end seq1 subseq ;
86 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
87 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
89 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
90 [ change-nth ] 2curry each ; inline
92 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
93 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
97 : (index-selector-for) ( quot length exampler -- selector accum )
98 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
102 : index-selector-for ( quot exemplar -- selector accum )
103 [ length ] keep (index-selector-for) ; inline
105 : index-selector ( quot -- selector accum )
106 V{ } index-selector-for ; inline
108 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
109 pick length over [ (index-selector-for) [ each-index ] dip ] 2curry dip like ; inline
111 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
112 over filter-index-as ; inline
114 : even-indices ( seq -- seq' )
115 [ length 1 + 2/ ] keep [
116 [ [ 2 * ] dip nth-unsafe ] curry
117 ] keep map-integers ;
119 : odd-indices ( seq -- seq' )
121 [ [ 2 * 1 + ] dip nth-unsafe ] curry
122 ] keep map-integers ;
124 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
125 [ split-when harvest ] dip join ; inline
127 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
129 [ [ harvest ] dip join ]
130 [ [ first empty? ] dip [ prepend ] curry when ]
131 [ [ last empty? ] dip [ append ] curry when ]
134 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
137 dup seq quot find-from drop
138 [ 2dup = [ 1 + ] when ] [ len ] if*
139 [ seq <slice> ] keep len or swap
140 ] produce nip ; inline
142 : cut-slice* ( seq n -- before after )
143 [ head-slice* ] [ tail-slice* ] 2bi ;
145 : rotate ( seq n -- seq' )
148 :: rotate! ( seq n -- )
149 n seq bounds-check length :> end
151 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
152 dup end = [ drop over ] when
153 2over = [ -rot nip over ] when
156 : all-rotations ( seq -- seq' )
157 dup length iota [ rotate ] with map ;
161 : (appender-for) ( quot length exemplar -- appender accum )
162 new-resizable [ [ push-all ] curry compose ] keep ; inline
166 : appender-for ( quot exemplar -- appender accum )
167 [ length ] keep (appender-for) ; inline
169 : appender ( quot -- appender accum )
170 V{ } appender-for ; inline
172 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
173 [ appender-for [ each ] dip ] keep like ; inline
175 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
176 [ length ] keep [ new-resizable ] [ append! ] bi ;
178 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
179 over empty? [ 2drop { } ] [
180 [ [ first ] dip call ] 2keep rot dup [
181 >resizable [ [ push-all ] curry compose ] keep
182 [ 1 ] 3dip [ (each) (each-integer) ] dip
186 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
187 [ pick ] dip swap length over
188 [ (selector-for) [ compose each ] dip ] 2curry dip like ; inline
190 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
191 pick map-filter-as ; inline
193 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
194 [ ] map-filter ; inline
196 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
197 [ empty? not ] map-filter ; inline
201 : ((each-from)) ( i seq -- n quot )
202 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
204 : (each-from) ( i seq quot -- n quot' ) [ ((each-from)) ] dip compose ;
209 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
210 [ -rot (each-from) ] dip map-integers ; inline
212 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
213 pick map-from-as ; inline
217 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
218 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
220 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
221 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
223 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
224 [ length ] keep (filter-mapper-for) ; inline
226 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
227 V{ } filter-mapper-for ; inline
231 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
232 [ pick ] dip swap length over
233 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
235 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
236 pick filter-map-as ; inline
238 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
239 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
241 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
242 [ 1 0 ? ] compose 2map-sum ; inline
244 : round-robin ( seq -- newseq )
246 [ longest length iota ] keep
247 [ [ ?nth ] with map ] curry map concat sift
250 : sift-as ( seq exemplar -- newseq )
253 : sift! ( seq -- newseq )
256 : harvest-as ( seq exemplar -- newseq )
257 [ empty? not ] swap filter-as ;
259 : harvest! ( seq -- newseq )
262 : head-as ( seq n exemplar -- seq' )
263 [ head-slice ] [ like ] bi* ; inline
265 : head*-as ( seq n exemplar -- seq' )
266 [ head-slice* ] [ like ] bi* ; inline
268 : tail-as ( seq n exemplar -- seq' )
269 [ tail-slice ] [ like ] bi* ; inline
271 : tail*-as ( seq n exemplar -- seq' )
272 [ tail-slice* ] [ like ] bi* ; inline
274 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
275 [ trim-slice ] [ like ] bi* ; inline
277 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
278 over empty? [ drop ] [
279 over [ first-unsafe ] [ last-unsafe ] bi pick either?
283 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
284 over empty? [ drop ] [
285 over first-unsafe over call
286 [ trim-head ] [ drop ] if
289 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
290 over empty? [ drop ] [
291 over last-unsafe over call
292 [ trim-tail ] [ drop ] if
295 : unsurround ( newseq seq2 seq3 -- seq1 )
296 [ ?head drop ] [ ?tail drop ] bi* ;
298 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
301 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
303 [ 1 + ] 2dip find-from drop not
304 ] [ 3drop f ] if ; inline
306 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
307 over [ [ (each-index) ] dip collect ] keep ; inline
311 : (2each-index) ( seq1 seq2 quot -- n quot' )
312 [ ((2each)) [ keep ] curry ] dip compose ; inline
316 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
317 (2each-index) each-integer ; inline
319 : 2map-into ( seq1 seq2 quot into -- )
320 [ (2each) ] dip collect ; inline
322 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
323 pick [ 2map-into ] keep ; inline
325 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
326 pick [ (2each-index) ] dip map-integers ; inline
328 TUPLE: evens seq length ;
330 : <evens> ( seq -- evens )
331 dup length 1 + 2/ evens boa ; inline
333 M: evens length length>> ; inline
335 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
337 INSTANCE: evens immutable-sequence
339 TUPLE: odds seq length ;
341 : <odds> ( seq -- odds )
342 dup length 2/ odds boa ; inline
344 M: odds length length>> ; inline
346 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
348 INSTANCE: odds immutable-sequence
350 : until-empty ( seq quot -- )
351 [ dup empty? ] swap until drop ; inline
353 : arg-max ( seq -- n )
354 <enum> [ second-unsafe ] supremum-by first ;
356 : arg-min ( seq -- n )
357 <enum> [ second-unsafe ] infimum-by first ;
361 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
362 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
366 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
367 over length <vector> [
368 [ push-index-if ] 2curry each-index
371 : arg-sort ( seq -- indices )
372 zip-index sort-keys values ;
374 : first= ( seq elt -- ? ) [ first ] dip = ; inline
375 : second= ( seq elt -- ? ) [ second ] dip = ; inline
376 : third= ( seq elt -- ? ) [ third ] dip = ; inline
377 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
378 : last= ( seq elt -- ? ) [ last ] dip = ; inline
379 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
381 : first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
382 : second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
383 : third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
384 : fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
385 : last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
386 : nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
388 : loop>sequence ( quot exemplar -- seq )
389 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
391 : loop>array ( quot -- seq )
392 { } loop>sequence ; inline
396 : (reverse) ( seq -- newseq )
397 dup [ length ] keep new-sequence
398 [ 0 swap copy-unsafe ] keep reverse! ;
402 : reverse-as ( seq exemplar -- newseq )
403 [ (reverse) ] [ like ] bi* ;
405 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
406 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
408 : insert-nth! ( elt n seq -- )
409 [ length ] keep ensure swap pick (a,b]
410 over '[ [ 1 + ] keep _ move-unsafe ] each
413 : set-nths ( value indices seq -- )
414 swapd '[ _ swap _ set-nth ] each ; inline
416 : set-nths-unsafe ( value indices seq -- )
417 swapd '[ _ swap _ set-nth-unsafe ] each ; inline
419 : flatten1 ( obj -- seq )
423 [ dup branch? [ % ] [ , ] if ] each
426 ] keep dup branch? [ drop f ] unless make ;
430 : (map-find-index) ( seq quot find-quot -- result i elt )
431 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
432 [ [ [ drop f ] unless ] keep ] dip ; inline
436 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
437 [ find-index ] (map-find-index) ; inline
439 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
441 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
443 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
445 : remove-first ( obj seq -- seq' )
446 [ index ] keep over [ remove-nth ] [ nip ] if ;
448 : remove-first! ( obj seq -- seq )
449 [ index ] keep over [ remove-nth! ] [ nip ] if ;
451 : remove-last ( obj seq -- seq' )
452 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
454 : remove-last! ( obj seq -- seq )
455 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
457 : ?first2 ( seq -- first/f second/f )
460 { 1 [ first-unsafe f ] }
461 [ drop first2-unsafe ]
464 : ?first3 ( seq -- first/f second/f third/f )
467 { 1 [ first-unsafe f f ] }
468 { 2 [ first2-unsafe f ] }
469 [ drop first3-unsafe ]
472 : ?first4 ( seq -- first/f second/f third/f fourth/f )
474 { 0 [ drop f f f f ] }
475 { 1 [ first-unsafe f f f ] }
476 { 2 [ first2-unsafe f f ] }
477 { 3 [ first3-unsafe f ] }
478 [ drop first4-unsafe ]
481 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
482 [ find drop ] 2keep drop swap
483 [ cut ] [ f over like ] if* ; inline
485 : nth* ( n seq -- elt )
486 [ length 1 - swap - ] [ nth ] bi ; inline
488 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
489 -rot (each-index) (each-integer) ; inline
493 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
495 [ keep swap ] curry [ dip ] curry
496 [ [ first 0 ] dip call ] 2keep
497 [ 2curry 3dip 5 npick pick ] curry
499 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
500 ] bi* compose 1 each-index-from nip swap ; inline
504 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
505 [ after? ] select-by* ; inline
507 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
508 [ before? ] select-by* ; inline
510 : change-last ( seq quot -- )
511 [ drop length 1 - ] [ change-nth ] 2bi ; inline
513 : change-last-unsafe ( seq quot -- )
514 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
516 : replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
517 over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
519 : count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
520 over [ count ] [ length ] bi* / ; inline
522 : find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
523 [ [ 1 - ] dip find-last-integer ] (find-index) ; inline
525 : map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
526 [ find-last-index ] (map-find-index) ; inline
528 :: (start-all) ( subseq seq increment -- indices )
530 [ [ subseq seq ] dip start* dup ]
531 [ [ increment + ] keep ] produce nip ;
533 : start-all ( subseq seq -- indices )
534 over length (start-all) ; inline
536 : start-all* ( subseq seq -- indices )
537 1 (start-all) ; inline
539 : count-subseq ( subseq seq -- n )
540 start-all length ; inline
542 : count-subseq* ( subseq seq -- n )
543 start-all* length ; inline