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
28 2map [ ] filter ; inline
30 : insert-sorted ( elt seq -- seq )
31 2dup [ < ] with find drop over length or swap insert-nth ;
33 : reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) i -- ... result )
34 [ swap ] 2dip each-from ; inline
36 :: subseq* ( from to seq -- subseq )
38 from [ dup 0 < [ len + ] when ] [ 0 ] if*
39 to [ dup 0 < [ len + ] when ] [ len ] if*
40 [ 0 len clamp ] bi@ dupd max seq subseq ;
42 : safe-subseq ( from to seq -- subseq )
43 [ length '[ 0 _ clamp ] bi@ ] keep subseq ;
45 : all-subseqs ( seq -- seqs )
46 dup length [1,b] [ clump ] with map concat ;
48 :: each-subseq ( ... seq quot: ( ... x -- ... ) -- ... )
54 from to seq subseq quot call
58 : subseq-as ( from to seq exemplar -- subseq )
59 [ check-slice subseq>copy (copy) ] dip like ;
61 : map-like ( seq exemplar -- seq' )
62 '[ _ like ] map ; inline
64 : filter-all-subseqs-range ( ... seq range quot: ( ... x -- ... ) -- seq )
66 '[ <clumps> _ filter ] with map concat
67 ] 3keep 2drop map-like ; inline
69 : filter-all-subseqs ( ... seq quot: ( ... x -- ... ) -- seq )
70 [ dup length [1,b] ] dip filter-all-subseqs-range ; inline
72 :: longest-subseq ( seq1 seq2 -- subseq )
77 len1 1 + [ len2 1 + 0 <array> ] replicate :> table
81 y 1 - seq2 nth-unsafe = [
82 y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
83 len y x table nth-unsafe set-nth-unsafe
84 len n > [ len n! x end! ] when
85 ] [ 0 y x table nth-unsafe set-nth-unsafe ] if
87 ] each end n - end seq1 subseq ;
89 : pad-longest ( seq1 seq2 elt -- seq1 seq2 )
90 [ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
92 : change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
93 [ change-nth ] 2curry each ; inline
95 : push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
96 [ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
100 : (index-selector-for) ( quot length exampler -- selector accum )
101 new-resizable [ [ push-if-index ] 2curry ] keep ; inline
105 : index-selector-for ( quot exemplar -- selector accum )
106 [ length ] keep (index-selector-for) ; inline
108 : index-selector ( quot -- selector accum )
109 V{ } index-selector-for ; inline
111 : filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
112 pick length over [ (index-selector-for) [ each-index ] dip ] 2curry dip like ; inline
114 : filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
115 over filter-index-as ; inline
117 : even-indices ( seq -- seq' )
118 [ length 1 + 2/ ] keep [
119 [ [ 2 * ] dip nth-unsafe ] curry
120 ] keep map-integers ;
122 : odd-indices ( seq -- seq' )
124 [ [ 2 * 1 + ] dip nth-unsafe ] curry
125 ] keep map-integers ;
127 : compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
128 [ split-when harvest ] dip join ; inline
130 : collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
132 [ [ harvest ] dip join ]
133 [ [ first empty? ] dip [ prepend ] curry when ]
134 [ [ last empty? ] dip [ append ] curry when ]
137 :: slice-when ( seq quot: ( elt -- ? ) -- seq' )
140 dup seq quot find-from drop
141 [ 2dup = [ 1 + ] when ] [ len ] if*
142 [ seq <slice> ] keep len or swap
143 ] produce nip ; inline
145 : cut-slice* ( seq n -- before after )
146 [ head-slice* ] [ tail-slice* ] 2bi ;
148 : rotate ( seq n -- seq' )
151 :: rotate! ( seq n -- )
152 n seq bounds-check length :> end
154 [ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
155 dup end = [ drop over ] when
156 2over = [ -rot nip over ] when
159 : all-rotations ( seq -- seq' )
160 dup length iota [ rotate ] with map ;
164 : (appender-for) ( quot length exemplar -- appender accum )
165 new-resizable [ [ push-all ] curry compose ] keep ; inline
169 : appender-for ( quot exemplar -- appender accum )
170 [ length ] keep (appender-for) ; inline
172 : appender ( quot -- appender accum )
173 V{ } appender-for ; inline
175 : map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
176 [ appender-for [ each ] dip ] keep like ; inline
178 : >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
179 [ length ] keep [ new-resizable ] [ over push-all ] bi ;
181 : map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
182 over empty? [ 2drop { } ] [
183 [ [ first ] dip call ] 2keep rot dup [
184 >resizable [ [ push-all ] curry compose ] keep
185 [ 1 ] 3dip [ (each) (each-integer) ] dip
189 : map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
190 [ pick ] dip swap length over
191 [ (selector-for) [ compose each ] dip ] 2curry dip like ; inline
193 : map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
194 pick map-filter-as ; inline
196 : map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
197 [ ] map-filter ; inline
199 : map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
200 [ empty? not ] map-filter ; inline
204 : ((each-from)) ( i seq -- n quot )
205 [ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
207 : (each-from) ( i seq quot -- n quot' ) [ ((each-from)) ] dip compose ;
212 : map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
213 [ -rot (each-from) ] dip map-integers ; inline
215 : map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
216 pick map-from-as ; inline
220 : push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
221 [ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
223 : (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
224 new-resizable [ [ push-map-if ] 3curry ] keep ; inline
226 : filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
227 [ length ] keep (filter-mapper-for) ; inline
229 : filter-mapper ( filter-quot map-quot -- filter-mapper accum )
230 V{ } filter-mapper-for ; inline
234 : filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
235 [ pick ] dip swap length over
236 [ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
238 : filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
239 pick filter-map-as ; inline
241 : 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
242 [ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
244 : 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
245 [ 1 0 ? ] compose 2map-sum ; inline
247 : round-robin ( seq -- newseq )
249 [ longest length iota ] keep
250 [ [ ?nth ] with map ] curry map concat sift
253 : sift-as ( seq exemplar -- newseq )
256 : sift! ( seq -- newseq )
259 : harvest-as ( seq exemplar -- newseq )
260 [ empty? not ] swap filter-as ;
262 : harvest! ( seq -- newseq )
263 [ empty? not ] filter! ;
265 : contains? ( seq elts -- ? )
266 [ member? ] curry any? ; inline
268 : head-as ( seq n exemplar -- seq' )
269 [ head-slice ] [ like ] bi* ; inline
271 : head*-as ( seq n exemplar -- seq' )
272 [ head-slice* ] [ like ] bi* ; inline
274 : tail-as ( seq n exemplar -- seq' )
275 [ tail-slice ] [ like ] bi* ; inline
277 : tail*-as ( seq n exemplar -- seq' )
278 [ tail-slice* ] [ like ] bi* ; inline
280 : trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
281 [ trim-slice ] [ like ] bi* ; inline
283 : ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
284 over empty? [ drop ] [
285 over [ first-unsafe ] [ last-unsafe ] bi pick either?
289 : ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
290 over empty? [ drop ] [
291 over first-unsafe over call
292 [ trim-head ] [ drop ] if
295 : ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
296 over empty? [ drop ] [
297 over last-unsafe over call
298 [ trim-tail ] [ drop ] if
301 : unsurround ( newseq seq2 seq3 -- seq1 )
302 [ ?head drop ] [ ?tail drop ] bi* ;
304 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
307 : one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
309 [ 1 + ] 2dip find-from drop not
310 ] [ 3drop f ] if ; inline
312 : map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
313 over [ [ (each-index) ] dip collect ] keep ; inline
317 : (2each-index) ( seq1 seq2 quot -- n quot' )
318 [ ((2each)) [ keep ] curry ] dip compose ; inline
322 : 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
323 (2each-index) each-integer ; inline
325 : 2map-into ( seq1 seq2 quot into -- )
326 [ (2each) ] dip collect ; inline
328 : 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
329 pick [ 2map-into ] keep ; inline
331 : 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
332 pick [ (2each-index) ] dip map-integers ; inline
334 TUPLE: evens seq length ;
336 : <evens> ( seq -- evens )
337 dup length 1 + 2/ evens boa ; inline
339 M: evens length length>> ; inline
341 M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
343 INSTANCE: evens immutable-sequence
345 TUPLE: odds seq length ;
347 : <odds> ( seq -- odds )
348 dup length 2/ odds boa ; inline
350 M: odds length length>> ; inline
352 M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
354 INSTANCE: odds immutable-sequence
356 : until-empty ( seq quot -- )
357 [ dup empty? ] swap until drop ; inline
359 : arg-max ( seq -- n )
360 <enum> [ second-unsafe ] supremum-by first ;
362 : arg-min ( seq -- n )
363 <enum> [ second-unsafe ] infimum-by first ;
367 : push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
368 [ dip ] dip rot [ push ] [ 2drop ] if ; inline
372 : arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
373 over length <vector> [
374 [ push-index-if ] 2curry each-index
377 : arg-sort ( seq -- indices )
378 dup length iota zip sort-keys values ;
380 : first= ( seq elt -- ? ) [ first ] dip = ; inline
381 : second= ( seq elt -- ? ) [ second ] dip = ; inline
382 : third= ( seq elt -- ? ) [ third ] dip = ; inline
383 : fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
384 : last= ( seq elt -- ? ) [ last ] dip = ; inline
385 : nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
387 : first? ( seq quot -- ? ) [ first ] dip call ; inline
388 : second? ( seq quot -- ? ) [ second ] dip call ; inline
389 : third? ( seq quot -- ? ) [ third ] dip call ; inline
390 : fourth? ( seq quot -- ? ) [ fourth ] dip call ; inline
391 : last? ( seq quot -- ? ) [ last ] dip call ; inline
392 : nth? ( n seq quot -- ? ) [ nth ] dip call ; inline
394 : loop>sequence ( quot exemplar -- seq )
395 [ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
397 : loop>array ( quot -- seq )
398 { } loop>sequence ; inline
402 : (reverse) ( seq -- newseq )
403 dup [ length ] keep new-sequence
404 [ 0 swap copy-unsafe ] keep reverse! ;
408 : reverse-as ( seq exemplar -- newseq )
409 [ (reverse) ] [ like ] bi* ;
411 : map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
412 [ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
414 : insert-nth! ( elt n seq -- )
415 [ length ] keep ensure swap pick (a,b]
416 over '[ [ 1 + ] keep _ move-unsafe ] each
419 : set-nths ( value indices seq -- )
420 swapd '[ [ _ ] dip _ set-nth ] each ; inline
422 : set-nths-unsafe ( value indices seq -- )
423 swapd '[ [ _ ] dip _ set-nth-unsafe ] each ; inline
425 : flatten1 ( obj -- seq )
429 [ dup branch? [ % ] [ , ] if ] each
432 ] keep dup branch? [ drop f ] unless make ;
436 : (map-find-index) ( seq quot find-quot -- result elt index )
437 [ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
438 [ [ [ drop f ] unless ] keep ] dip ; inline
442 : map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result elt index )
443 [ find-index ] (map-find-index) ; inline
445 : filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
447 : all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
449 : all-longest ( seqs -- seqs' ) dup longest length filter-length ;
451 : remove-first ( obj seq -- seq' )
452 [ index ] keep over [ remove-nth ] [ nip ] if ;
454 : remove-first! ( obj seq -- seq )
455 [ index ] keep over [ remove-nth! ] [ nip ] if ;
457 : remove-last ( obj seq -- seq' )
458 [ last-index ] keep over [ remove-nth ] [ nip ] if ;
460 : remove-last! ( obj seq -- seq )
461 [ last-index ] keep over [ remove-nth! ] [ nip ] if ;
463 : ?first2 ( seq -- first/f second/f )
466 { 1 [ first-unsafe f ] }
467 [ drop first2-unsafe ]
470 : ?first3 ( seq -- first/f second/f third/f )
473 { 1 [ first-unsafe f f ] }
474 { 2 [ first2-unsafe f ] }
475 [ drop first3-unsafe ]
478 : ?first4 ( seq -- first/f second/f third/f fourth/f )
480 { 0 [ drop f f f f ] }
481 { 1 [ first-unsafe f f f ] }
482 { 2 [ first2-unsafe f f ] }
483 { 3 [ first3-unsafe f ] }
484 [ drop first4-unsafe ]
487 : cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
488 [ find drop ] 2keep drop swap
489 [ cut ] [ f over like ] if* ; inline
491 : nth* ( n seq -- elt )
492 [ length 1 - swap - ] [ nth ] bi ; inline
494 : each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
495 -rot (each-index) (each-integer) ; inline
499 : select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
501 [ keep swap ] curry [ dip ] curry
502 [ [ first 0 ] dip call ] 2keep
503 [ 2curry 3dip 5 npick pick ] curry
505 [ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
506 ] bi* compose 1 each-index-from nip swap ; inline
510 : supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
511 [ after? ] select-by* ; inline
513 : infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
514 [ before? ] select-by* ; inline
516 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
517 [ [ not ] compose ] [ filter-as ] bi* ; inline
519 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
520 over reject-as ; inline
522 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
523 [ not ] compose filter! ; inline
525 : change-last ( seq quot -- )
526 [ drop length 1 - ] [ change-nth ] 2bi ; inline
528 : change-last-unsafe ( seq quot -- )
529 [ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline