1 ! Copyright (C) 2005, 2011 Slava Pestov, Daniel Ehrenberg.
2 ! See https://factorcode.org/license.txt for BSD license.
3 USING: accessors kernel kernel.private math math.order
4 math.private slots.private ;
9 GENERIC: length ( seq -- n ) flushable
10 GENERIC: set-length ( n seq -- )
11 GENERIC: nth ( n seq -- elt ) flushable
12 GENERIC: set-nth ( elt n seq -- )
13 GENERIC: new-sequence ( len seq -- newseq ) flushable
14 GENERIC: new-resizable ( len seq -- newseq ) flushable
15 GENERIC: like ( seq exemplar -- newseq ) flushable
16 GENERIC: clone-like ( seq exemplar -- newseq ) flushable
18 : lengthd ( seq obj -- n obj ) [ length ] dip ; inline
20 : new-sequence-like ( len-exemplar type-exemplar -- newseq )
21 lengthd new-sequence ; inline
23 : new-resizable-like ( len-exemplar type-exemplar -- newseq )
24 lengthd new-resizable ; inline
26 : new-like ( len exemplar quot -- seq )
27 over [ [ new-sequence ] dip call ] dip like ; inline
29 M: sequence like drop ; inline
31 GENERIC: lengthen ( n seq -- )
32 GENERIC: shorten ( n seq -- )
34 M: sequence lengthen 2dup length > [ set-length ] [ 2drop ] if ; inline
35 M: sequence shorten 2dup length < [ set-length ] [ 2drop ] if ; inline
37 : 2length ( seq1 seq2 -- n1 n2 ) [ length ] bi@ ; inline
38 : 3length ( seq1 seq2 seq3 -- n1 n2 n3 ) [ length ] tri@ ; inline
40 : empty? ( seq -- ? ) length 0 = ; inline
42 : if-empty ( ..a seq quot1: ( ..a -- ..b ) quot2: ( ..a seq -- ..b ) -- ..b )
43 [ dup empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
45 : when-empty ( ... seq quot: ( ... -- ... obj ) -- ... seq/obj ) [ ] if-empty ; inline
46 : unless-empty ( ... seq quot: ( ... seq -- ... ) -- ... ) [ ] swap if-empty ; inline
48 : delete-all ( seq -- ) 0 swap set-length ;
50 : first ( seq -- first ) 0 swap nth ; inline
51 : second ( seq -- second ) 1 swap nth ; inline
52 : third ( seq -- third ) 2 swap nth ; inline
53 : fourth ( seq -- fourth ) 3 swap nth ; inline
55 : set-first ( first seq -- ) 0 swap set-nth ; inline
56 : set-second ( second seq -- ) 1 swap set-nth ; inline
57 : set-third ( third seq -- ) 2 swap set-nth ; inline
58 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
60 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
62 ERROR: bounds-error index seq ;
64 GENERIC#: bounds-check? 1 ( n seq -- ? )
66 M: integer bounds-check?
67 dupd length < [ 0 >= ] [ drop f ] if ; inline
69 : bounds-check ( n seq -- n seq )
70 2dup bounds-check? [ bounds-error ] unless ; inline
72 MIXIN: immutable-sequence
74 ERROR: immutable element index sequence ;
76 M: immutable-sequence set-nth immutable ;
78 INSTANCE: immutable-sequence sequence
82 : array-nth ( n array -- elt )
83 swap 2 fixnum+fast slot ; inline
85 : set-array-nth ( elt n array -- )
86 swap 2 fixnum+fast set-slot ; inline
88 : dispatch ( n array -- ) array-nth call ;
90 GENERIC: resize ( n seq -- newseq ) flushable
92 ! Unsafe sequence protocol for inner loops
93 GENERIC: nth-unsafe ( n seq -- elt ) flushable
94 GENERIC: set-nth-unsafe ( elt n seq -- )
96 M: sequence nth bounds-check nth-unsafe ; inline
97 M: sequence set-nth bounds-check set-nth-unsafe ; inline
99 M: sequence nth-unsafe nth ; inline
100 M: sequence set-nth-unsafe set-nth ; inline
104 ! The f object supports the sequence protocol trivially
105 M: f length drop 0 ; inline
106 M: f nth-unsafe nip ; inline
107 M: f like drop [ f ] when-empty ; inline
109 INSTANCE: f immutable-sequence
112 TUPLE: iota { n integer read-only } ;
114 ERROR: non-negative-integer-expected n ;
116 : ensure-non-negative ( n -- n )
117 dup 0 < [ non-negative-integer-expected ] when ; inline
119 : <iota> ( n -- iota )
120 ensure-non-negative iota boa ; inline
122 M: iota length n>> ; inline
123 M: iota nth-unsafe drop ; inline
125 INSTANCE: iota immutable-sequence
129 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
130 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
131 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
132 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
134 : first2-unsafe ( seq -- first second )
135 [ first-unsafe ] [ second-unsafe ] bi ; inline
137 : first3-unsafe ( seq -- first second third )
138 [ first2-unsafe ] [ third-unsafe ] bi ; inline
140 : first4-unsafe ( seq -- first second third fourth )
141 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
143 : exchange-unsafe ( m n seq -- )
144 [ [ nth-unsafe ] curry bi@ ]
145 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
147 : (1sequence) ( obj seq -- seq )
148 [ 0 swap set-nth-unsafe ] keep ; inline
150 : (2sequence) ( obj1 obj2 seq -- seq )
151 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
153 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
154 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
156 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
157 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
161 : head-to-index ( seq to -- zero to seq ) [ 0 ] 2dip swap ; inline
163 : index-to-tail ( seq from -- from length seq ) swap [ length ] keep ; inline
165 : from-tail ( seq n -- seq n' ) [ dup length ] dip - ; inline
167 : 1sequence ( obj exemplar -- seq )
168 1 swap [ (1sequence) ] new-like ; inline
170 : 2sequence ( obj1 obj2 exemplar -- seq )
171 2 swap [ (2sequence) ] new-like ; inline
173 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
174 3 swap [ (3sequence) ] new-like ; inline
176 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
177 4 swap [ (4sequence) ] new-like ; inline
179 : first2 ( seq -- first second )
180 1 swap bounds-check nip first2-unsafe ; inline
182 : first3 ( seq -- first second third )
183 2 swap bounds-check nip first3-unsafe ; inline
185 : first4 ( seq -- first second third fourth )
186 3 swap bounds-check nip first4-unsafe ; inline
188 : ??nth ( n seq -- elt/f ? )
189 2dup bounds-check? [ nth-unsafe t ] [ 2drop f f ] if ; inline
191 : ?nth ( n seq -- elt/f ) ??nth drop ; inline
193 : ?set-nth ( elt n seq -- )
194 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
196 : index-or-length ( seq n -- seq n' ) over length min ; inline
198 : index-of-last ( seq -- n seq ) [ length 1 - ] keep ; inline
200 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
201 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
202 : ?last ( seq -- elt/f )
203 index-of-last over 0 <
204 [ 2drop f ] [ nth-unsafe ] if ; inline
206 MIXIN: virtual-sequence
207 GENERIC: virtual-exemplar ( seq -- seq' )
208 GENERIC: virtual@ ( n seq -- n' seq' )
210 M: virtual-sequence nth virtual@ nth ; inline
211 M: virtual-sequence set-nth virtual@ set-nth ; inline
212 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
213 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
214 M: virtual-sequence like virtual-exemplar like ; inline
215 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
217 INSTANCE: virtual-sequence sequence
219 ! A reversal of an underlying sequence.
220 TUPLE: reversed { seq read-only } ;
222 C: <reversed> reversed
224 M: reversed virtual-exemplar seq>> ; inline
225 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
226 M: reversed length seq>> length ; inline
228 INSTANCE: reversed virtual-sequence
230 ! A slice of another sequence.
232 { from integer read-only }
233 { to integer read-only }
236 : >slice< ( slice -- from to seq )
237 [ from>> ] [ to>> ] [ seq>> ] tri ; inline
239 : collapse-slice ( m n slice -- m' n' seq )
240 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
242 ERROR: slice-error from to seq ;
244 : check-slice ( from to seq -- from to seq )
245 pick 0 < [ slice-error ] when
246 2dup length > [ slice-error ] when
247 2over > [ slice-error ] when ; inline
251 : <slice-unsafe> ( from to seq -- slice )
252 dup slice? [ collapse-slice ] when slice boa ; inline
256 : <slice> ( from to seq -- slice )
257 check-slice <slice-unsafe> ; inline
259 M: slice virtual-exemplar seq>> ; inline
261 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
263 M: slice length [ to>> ] [ from>> ] bi - ; inline
265 : head-slice ( seq n -- slice ) head-to-index <slice> ; inline
267 : tail-slice ( seq n -- slice ) index-to-tail <slice> ; inline
269 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
271 : head-slice* ( seq n -- slice ) from-tail head-slice ; inline
273 : tail-slice* ( seq n -- slice ) from-tail tail-slice ; inline
275 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
277 INSTANCE: slice virtual-sequence
279 ! One element repeated many times
281 { length integer read-only }
284 : <repetition> ( len elt -- repetition )
285 over 0 < [ non-negative-integer-expected ] when
286 repetition boa ; inline
288 M: repetition length length>> ; inline
289 M: repetition nth-unsafe nip elt>> ; inline
291 INSTANCE: repetition immutable-sequence
295 ERROR: integer-length-expected obj ;
297 ! The check-length call forces partial dispatch
298 : check-length ( n -- n )
299 dup integer? [ integer-length-expected ] unless ; inline
301 : >sequence< ( seq -- i n seq )
302 [ drop 0 ] [ length check-length ] [ ] tri ; inline
304 : length-sequence ( seq -- n seq )
305 [ length check-length ] [ ] bi ; inline
307 : >underlying< ( slice/seq -- from to slice/seq )
308 dup slice? [ >slice< ] [ >sequence< ] if ; inline
311 { src-i integer read-only }
313 { dst-i integer read-only }
318 : copy-nth-unsafe ( n copy -- )
319 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
320 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
322 : (copy) ( n copy -- dst )
323 over 0 <= [ nip dst>> ] [
324 [ 1 - ] dip [ copy-nth-unsafe ] [ (copy) ] 2bi
325 ] if ; inline recursive
327 : subseq>copy ( from to seq -- n copy )
328 [ over - check-length swap ] dip
329 3dup nip new-sequence 0 swap <copier> ; inline
331 : bounds-check-head ( n seq -- n seq )
332 over 0 < [ bounds-error ] when ; inline
334 : check-grow-copy ( dst n src -- dst src n )
335 over [ lengthd + lengthen ] 2keep ; inline
337 : copy-unsafe ( src i dst -- )
338 [ [ length check-length 0 ] keep ] 2dip <copier> (copy) drop ; inline
340 : subseq-unsafe-as ( from to seq exemplar -- subseq )
341 [ subseq>copy (copy) ] dip like ; inline
343 : subseq-unsafe ( from to seq -- subseq )
344 dup subseq-unsafe-as ; inline
346 : change-nth-unsafe ( i seq quot -- )
347 [ [ nth-unsafe ] dip call ] 2keepd set-nth-unsafe ; inline
349 : nth-of-unsafe ( seq n -- elt ) swap nth-unsafe ; inline
351 : set-nth-of-unsafe ( seq n elt -- seq ) swap pick set-nth-unsafe ; inline
353 : copy-nth-of-unsafe ( dst dst-i src src-i -- )
354 nth-of-unsafe set-nth-of-unsafe drop ; inline
356 : copy-loop ( dst dst-i src src-i src-stop -- dst )
361 [ copy-nth-of-unsafe ] 4keep
364 ] if ; inline recursive
368 : subseq-as ( from to seq exemplar -- subseq )
369 [ check-slice ] dip subseq-unsafe-as ;
371 : subseq ( from to seq -- subseq )
374 : head ( seq n -- headseq ) head-to-index subseq ;
376 : tail ( seq n -- tailseq ) index-to-tail subseq ;
378 : rest ( seq -- tailseq ) 1 tail ;
380 : head* ( seq n -- headseq ) from-tail head ;
382 : tail* ( seq n -- tailseq ) from-tail tail ;
384 : but-last ( seq -- headseq ) 1 head* ;
386 : copy ( src i dst -- )
387 3dup bounds-check-head
388 [ swap length + ] dip lengthen
391 M: sequence clone-like
392 dupd new-sequence-like [ 0 swap copy-unsafe ] keep ; inline
394 M: immutable-sequence clone-like like ; inline
396 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
400 : (append) ( seq1 seq2 accum -- accum )
401 [ [ over length ] dip copy-unsafe ]
402 [ 0 swap copy-unsafe ]
407 : append-as ( seq1 seq2 exemplar -- newseq )
408 [ 2dup 2length + ] dip
409 [ (append) ] new-like ; inline
411 : append ( seq1 seq2 -- newseq ) over append-as ;
413 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
415 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
417 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
418 [ 3dup 3length + + ] dip [
419 [ [ 2over 2length + ] dip copy-unsafe ]
423 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
425 : surround-as ( seq1 seq2 seq3 exemplar -- newseq )
426 [ swap ] 2dip 3append-as ; inline
428 : surround ( seq1 seq2 seq3 -- newseq ) over surround-as ; inline
430 : 1surround-as ( seq1 seq2 exemplar -- newseq ) dupd surround-as ; inline
432 : 1surround ( seq1 seq2 -- newseq ) dup 1surround-as ; inline
434 : glue-as ( seq1 seq2 seq3 exemplar -- newseq ) swapd 3append-as ; inline
436 : glue ( seq1 seq2 seq3 -- newseq ) pick glue-as ; inline
438 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
439 [ [ nth ] dip call ] 2keepd set-nth-unsafe ; inline
441 : min-length ( seq1 seq2 -- n ) 2length min ; inline
443 : max-length ( seq1 seq2 -- n ) 2length max ; inline
447 : sequence-operator ( seq quot -- i n quot' )
448 [ >underlying< [ nth-unsafe ] curry ] dip compose ; inline
450 : length-iterator ( seq -- n quot' )
451 length-sequence [ nth-unsafe ] curry ; inline
453 : length-operator ( seq quot -- n quot' )
454 [ length-iterator ] dip compose ; inline
456 : collect-into ( quot into -- quot' )
457 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
459 : collect-from ( i n quot into -- )
460 collect-into each-integer-from ; inline
462 : collect ( n quot into -- )
463 collect-into each-integer ; inline
465 : sequence-index-operator ( seq quot -- n quot' )
466 [ length-iterator [ keep ] curry ] dip compose ; inline
468 : map-into ( seq quot into -- )
469 [ length-operator ] dip collect ; inline
471 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
472 [ nth-unsafe ] bi-curry@ bi ; inline
474 : 2length-iterator ( seq1 seq2 -- n quot )
475 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
477 : 2length-operator ( seq1 seq2 quot -- n quot' )
478 [ 2length-iterator ] dip compose ; inline
480 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
481 [ nth-unsafe ] tri-curry@ tri ; inline
483 : 3length-iterator ( seq1 seq2 seq3 -- n quot )
484 [ 3length min min check-length ]
485 [ [ 3nth-unsafe ] 3curry ] 3bi ; inline
487 : 3length-operator ( seq1 seq2 seq3 quot -- n quot' )
488 [ 3length-iterator ] dip compose ; inline
490 : element/index ( i/f seq -- elt/f i/f )
491 '[ [ _ nth ] [ f ] if* ] keep ; inline
493 : index/element ( i/f seq -- i/f elt/f )
494 dupd '[ _ nth ] [ f ] if* ; inline
496 : (accumulate) ( seq identity quot -- identity seq quot' )
497 swapd [ keepd ] curry ; inline
499 : (accumulate*) ( seq identity quot -- identity seq quot' )
500 swapd [ dup ] compose ; inline
504 : each ( ... seq quot: ( ... x -- ... ) -- ... )
505 sequence-operator each-integer-from ; inline
507 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
508 -rot length-operator each-integer-from ; inline
510 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
513 : map-integers-from-as ( ... from len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
514 overd [ [ collect-from ] keep ] new-like ; inline
516 : map-integers-as ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
517 overd [ [ collect ] keep ] new-like ; inline
519 : map-integers ( ... len quot: ( ... i -- ... elt ) -- ... newseq )
520 { } map-integers-as ; inline
522 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
523 [ length-operator ] dip map-integers-as ; inline
525 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
528 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
529 [ [ drop ] prepose ] dip map-integers-as ; inline
531 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
532 { } replicate-as ; inline
534 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
535 over [ map-into ] keep ; inline
537 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
538 [ (accumulate) ] dip map-as ; inline
540 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
541 pick accumulate-as ; inline
543 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
544 (accumulate) map! ; inline
546 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
547 [ (accumulate*) ] dip map-as nip ; inline
549 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
550 pick accumulate*-as ; inline
552 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
553 (accumulate*) map! nip ; inline
555 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
556 2length-operator each-integer ; inline
558 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) from -- ... )
559 -roll 2length-operator each-integer-from ; inline
561 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
564 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
565 [ 2length-operator ] dip map-integers-as ; inline
567 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
568 pick 2map-as ; inline
570 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
571 2length-operator all-integers? ; inline
573 : 2any? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
574 negate 2all? not ; inline
576 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
577 3length-operator each-integer ; inline
579 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
580 [ 3length-operator ] dip map-integers-as ; inline
582 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
583 pickd swap 3map-as ; inline
587 : bounds-check-call ( n seq quot -- obj1 obj2 )
588 2over bounds-check? [ call ] [ 3drop f f ] if ; inline
590 : do-find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i/f seq )
591 [ length-operator find-integer-from ] keepd ; inline
593 : find-last-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i/f seq )
594 [ length-operator nip find-last-integer ] keepd ; inline
598 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
599 '[ _ do-find-from index/element ] bounds-check-call ; inline
601 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
602 [ 0 ] 2dip do-find-from index/element ; inline
604 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
605 '[ _ find-last-from-unsafe index/element ] bounds-check-call ; inline
607 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
608 [ index-of-last ] dip find-last-from ; inline
610 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
612 _ [ sequence-index-operator find-integer-from ] keepd
614 ] bounds-check-call ; inline
616 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
617 [ 0 ] 2dip find-index-from ; inline
619 : find-from* ( ... n seq quot: ( ... elt -- ... ? ) -- ... elt i/f )
620 '[ _ do-find-from element/index ] bounds-check-call ; inline
622 : find* ( ... seq quot: ( ... elt -- ... ? ) -- ... elt i/f )
623 [ 0 ] 2dip do-find-from element/index ; inline
625 : find-last-from* ( ... n seq quot: ( ... elt -- ... ? ) -- ... elt i/f )
626 '[ _ find-last-from-unsafe element/index ] bounds-check-call ; inline
628 : find-last* ( ... seq quot: ( ... elt -- ... ? ) -- ... elt i/f )
629 [ index-of-last ] dip find-last-from* ; inline
631 : find-index-from* ( ... n seq quot: ( ... elt i -- ... ? ) -- ... elt i/f )
633 _ [ sequence-index-operator find-integer-from ] keepd
635 ] bounds-check-call ; inline
637 : find-index* ( ... seq quot: ( ... elt i -- ... ? ) -- ... elt i/f )
638 [ 0 ] 2dip find-index-from* ; inline
640 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
641 sequence-operator all-integers-from? ; inline
643 : push-when ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
644 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
648 : (selector-as) ( quot length exemplar -- selector accum )
649 new-resizable [ [ push-when ] 2curry ] keep ; inline
653 : selector-as ( quot exemplar -- selector accum )
654 [ length ] keep (selector-as) ; inline
656 : selector ( quot -- selector accum )
657 V{ } selector-as ; inline
659 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
660 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
662 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
663 over filter-as ; inline
665 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
666 [ negate ] [ filter-as ] bi* ; inline
668 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
669 over reject-as ; inline
671 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
672 [ keep swap ] 2dip ? push ; inline
674 : 2selector ( quot -- selector accum1 accum2 )
675 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
677 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
678 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
680 : collector-as ( quot exemplar -- quot' vec )
681 dup new-resizable-like [ [ push ] curry compose ] keep ; inline
683 : collector ( quot -- quot' vec )
684 V{ } collector-as ; inline
686 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
687 dup [ collector-as [ while ] dip ] curry dip like ; inline
689 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
690 { } produce-as ; inline
692 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
693 [ dup ] swap [ keep ] curry produce nip ; inline
695 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
696 sequence-index-operator each-integer ; inline
698 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
699 [ dup length <iota> ] 2dip 2map-as ; inline
701 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
702 over map-index-as ; inline
704 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
705 pick empty? [ 3drop ] [
706 [ [ drop first-unsafe ] dip call ]
707 [ [ bi* ] 2curry 1 each-from ]
711 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
712 swapd each-index ; inline
714 : index ( obj seq -- n )
715 [ = ] with find drop ;
717 : index-from ( obj i seq -- n )
718 rot [ = ] curry find-from drop ;
720 : last-index ( obj seq -- n )
721 [ = ] with find-last drop ;
723 : last-index-from ( obj i seq -- n )
724 rot [ = ] curry find-last-from drop ;
726 : indices ( obj seq -- indices )
727 swap [ = ] curry [ swap ] prepose V{ } clone [
728 [ push ] curry [ [ drop ] if ] curry compose each-index
733 : nths-unsafe ( indices seq -- seq' )
734 [ [ nth-unsafe ] curry ] keep map-as ;
738 : nths ( indices seq -- seq' )
739 [ [ nth ] curry ] keep map-as ;
741 : nths-of ( seq indices -- seq' )
744 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
745 find drop >boolean ; inline
747 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
750 : member? ( elt seq -- ? )
753 : member-eq? ( elt seq -- ? )
756 : remove ( elt seq -- newseq )
759 : remove-eq ( elt seq -- newseq )
760 [ eq? ] with reject ;
762 : sift ( seq -- newseq )
765 : harvest ( seq -- newseq )
770 : mismatch-unsafe ( n seq1 seq2 -- i )
771 [ 2nth-unsafe = not ] 2curry find-integer ; inline
775 : mismatch ( seq1 seq2 -- i )
776 [ min-length ] 2keep mismatch-unsafe ;
779 [ mismatch ] 2keep pick
780 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
782 : sequence= ( seq1 seq2 -- ? )
784 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
786 ERROR: assert-sequence got expected ;
788 : assert-sequence= ( a b -- )
789 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
791 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
793 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
797 : sequence-hashcode-step ( oldhash newpart -- newhash )
798 integer>fixnum swap [
799 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
800 fixnum+fast fixnum+fast
801 ] keep fixnum-bitxor ; inline
805 : sequence-hashcode ( n seq -- x )
806 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
808 M: sequence hashcode* [ sequence-hashcode ] recursive-hashcode ;
811 over 0 <= [ 2drop 0 ] [
812 nip length 0 swap [ sequence-hashcode-step ] each-integer
815 M: reversed hashcode* [ sequence-hashcode ] recursive-hashcode ;
817 M: slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
819 : move ( to from seq -- )
821 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
825 : move-unsafe* ( to from seq -- from-nth )
828 [ [ nth-unsafe tuck swap ] [ set-nth-unsafe ] bi ] if ; inline
830 : filter-from! ( store from seq quot: ( ... elt -- ... ? ) -- seq )
832 [ [ move-unsafe* ] dip call ] 4keep
833 [ swap [ 1 + ] when ] 3dip
834 [ 1 + ] 2dip filter-from!
835 ] [ drop [ nip set-length ] keep ] if ; inline recursive
837 : move-unsafe ( to from seq -- )
839 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
843 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
844 [ 0 0 ] 2dip filter-from! ; inline
846 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
847 negate filter! ; inline
849 : remove! ( elt seq -- seq )
852 : remove-eq! ( elt seq -- seq )
853 [ eq? ] with reject! ;
855 : prefix ( seq elt -- newseq )
856 over [ over length 1 + ] dip [
857 (1sequence) [ 1 swap copy-unsafe ] keep
860 : suffix ( seq elt -- newseq )
861 over [ over length 1 + ] dip [
862 [ [ over length ] dip set-nth-unsafe ] keep
863 [ 0 swap copy-unsafe ] keep
866 : suffix! ( seq elt -- seq ) over push ; inline
868 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
870 : last ( seq -- elt )
872 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
876 : last-unsafe ( seq -- elt )
877 index-of-last nth-unsafe ; inline
881 : set-last ( elt seq -- )
883 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
885 : pop* ( seq -- ) index-of-last shorten ;
889 : move-backward ( shift from to seq -- )
893 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
897 : open-slice ( shift from seq -- )
901 [ ] [ nip length + ] [ 2nip ] 3tri
902 [ [ length ] keep [ over - ] 2dip move-backward ] 2dip
908 : delete-slice ( from to seq -- )
909 check-slice [ over [ - ] dip ] dip open-slice ;
911 : remove-nth! ( n seq -- seq )
912 [ [ dup 1 + ] dip delete-slice ] keep ;
914 : snip ( from to seq -- head tail )
915 [ swap head ] [ swap tail ] bi-curry bi* ; inline
917 : snip-slice ( from to seq -- head tail )
918 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
920 : replace-slice ( new from to seq -- seq' )
921 snip-slice surround ;
923 : remove-nth ( n seq -- seq' )
924 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
927 index-of-last over 0 >=
928 [ [ nth-unsafe ] [ shorten ] 2bi ]
929 [ bounds-error ] if ;
931 : exchange ( m n seq -- )
932 [ nip bounds-check 2drop ]
933 [ bounds-check 3drop ]
937 : midpoint@ ( seq -- n ) length 2/ ; inline
939 : reverse! ( seq -- seq )
941 [ midpoint@ ] [ length ] [ ] tri
942 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
946 : reverse ( seq -- newseq )
948 dup [ length ] keep new-sequence
949 [ 0 swap copy-unsafe ] keep reverse!
952 GENERIC: sum-lengths ( seq -- n )
954 M: object sum-lengths
955 0 [ length + ] reduce ;
957 M: repetition sum-lengths
958 [ length>> ] [ elt>> length ] bi * ;
960 : concat-as ( seq exemplar -- newseq )
962 [ dup sum-lengths ] dip new-resizable
963 [ [ push-all ] curry each ] keep
966 : concat ( seq -- newseq )
967 [ { } ] [ dup first concat-as ] if-empty ;
971 : joined-length ( seq glue -- n )
972 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
976 : join-as ( seq glue exemplar -- newseq )
977 over empty? [ nip concat-as ] [
979 2dup joined-length over new-resizable [
980 [ [ push-all ] 2curry ]
981 [ nip [ push-all ] curry ] 2bi
987 : join ( seq glue -- newseq )
992 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
994 [ over length [-] dup 0 = [ drop ] ] dip
995 [ <repetition> ] curry
996 ] dip compose if ; inline
1000 : pad-head ( seq n elt -- padded )
1001 [ swap dup append-as ] padding ;
1003 : pad-tail ( seq n elt -- padded )
1004 [ append ] padding ;
1006 : shorter? ( seq1 seq2 -- ? ) 2length < ; inline
1007 : longer? ( seq1 seq2 -- ? ) 2length > ; inline
1008 : shorter ( seq1 seq2 -- seq ) [ 2length <= ] most ; inline
1009 : longer ( seq1 seq2 -- seq ) [ 2length >= ] most ; inline
1011 : head? ( seq begin -- ? )
1015 [ length [ head-slice ] keep swap ] keep
1019 : tail? ( seq end -- ? )
1023 [ length [ tail-slice* ] keep swap ] keep
1027 : cut-slice ( seq n -- before-slice after-slice )
1028 [ head-slice ] [ tail-slice ] 2bi ; inline
1030 : cut-slice* ( seq n -- before-slice after-slice )
1031 [ head-slice* ] [ tail-slice* ] 2bi ;
1033 : insert-nth ( elt n seq -- seq' )
1034 swap cut-slice [ swap suffix ] dip append ;
1036 : halves ( seq -- first-slice second-slice )
1037 dup midpoint@ cut-slice ; inline
1041 : nth2-unsafe ( n seq -- a b )
1042 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
1044 : nth3-unsafe ( n seq -- a b c )
1045 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
1047 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
1048 ! We can't use case here since combinators depends on
1053 [ 2nip swap nth-unsafe ]
1054 [ -rot [ drop swap nth2-unsafe ] dip call ]
1055 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
1058 [ 2/ ] [ over - ] bi [ 2dup + ] dip
1059 [ (binary-reduce) ] [ 2curry ] curry 2bi@
1060 pick [ 3bi ] dip call
1061 ] if ; inline recursive
1065 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
1067 [ seq>> ] 3dip [ from>> 0 max ] [ to>> 0 max over - ] bi
1070 ] if (binary-reduce) ; inline
1072 : cut ( seq n -- before after )
1073 [ head ] [ tail ] 2bi ;
1075 : cut* ( seq n -- before after )
1076 [ head* ] [ tail* ] 2bi ;
1078 : subseq-starts-at? ( i seq subseq -- ? )
1079 [ length swap ] keep
1081 [ + _ nth-unsafe ] keep _ nth-unsafe =
1082 ] with all-integers? ; inline
1084 : subseq-index-from ( n seq subseq -- i/f )
1085 [ 2length - 1 + ] 2keep
1086 '[ _ _ subseq-starts-at? ] find-integer-from ; inline
1088 : subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
1090 : subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
1092 : subseq-start-from ( subseq seq n -- i/f )
1093 spin subseq-index-from ; inline deprecated
1095 : subseq-start ( subseq seq -- i/f ) swap subseq-index ; inline deprecated
1097 : subseq? ( subseq seq -- ? ) subseq-start >boolean ; inline deprecated
1099 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
1100 2dup mismatch [ 2dup min-length ] unless*
1101 [ tail-slice ] curry bi@ ;
1103 : unclip ( seq -- rest first )
1104 [ rest ] [ first-unsafe ] bi ;
1106 : unclip-last ( seq -- butlast last )
1107 [ but-last ] [ last-unsafe ] bi ;
1109 : unclip-slice ( seq -- rest-slice first )
1110 [ rest-slice ] [ first-unsafe ] bi ; inline
1112 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1113 [ [ [ first ] keep ] dip [ dip ] keep ] dip
1114 '[ swap _ dip swap @ ] 1 each-from ; inline
1116 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1117 [ [ [ [ first ] bi@ ] 2keep ] dip [ 2dip ] keep ] dip
1118 '[ rot _ dip swap @ ] 1 2each-from ; inline
1122 : (map-find) ( seq quot find-quot -- result elt )
1123 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1127 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1128 [ find ] (map-find) ; inline
1130 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1131 [ find-last ] (map-find) ; inline
1133 : unclip-last-slice ( seq -- butlast-slice last )
1134 [ but-last-slice ] [ last-unsafe ] bi ; inline
1138 : (trim-head) ( seq quot -- seq n )
1139 over [ negate find drop ] dip swap
1140 [ dup length ] unless* ; inline
1142 : (trim-tail) ( seq quot -- seq n )
1143 over [ negate find-last drop ?1+ ] dip
1148 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1149 (trim-head) tail-slice ; inline
1151 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1152 (trim-head) tail ; inline
1154 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1155 (trim-tail) head-slice ; inline
1157 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1158 (trim-tail) head ; inline
1160 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1161 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1163 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1164 [ trim-slice ] [ drop ] 2bi like ; inline
1166 GENERIC: sum ( seq -- n )
1167 M: object sum 0 [ + ] binary-reduce ; inline
1168 M: iota sum length dup 1 - * 2/ ; inline
1169 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1171 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1173 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1175 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1177 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1178 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1180 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1181 [ 1 0 ? ] compose map-sum ; inline
1183 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1184 [ with each ] 2curry each ; inline
1186 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1187 [ with { } map-as ] 2curry { } map-as ; inline
1189 : cartesian-product-as ( seq1 seq2 exemplar -- newseq )
1190 [ 2sequence ] curry cartesian-map ; inline
1192 : cartesian-product ( seq1 seq2 -- newseq )
1193 dup cartesian-product-as ; inline
1195 : cartesian-find ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... elt1 elt2 )
1196 [ f ] 3dip [ with find swap ] 2curry [ nip ] prepose find nip swap ; inline
1200 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1202 [ keep swap ] curry [ [ first ] dip call ] 2keep
1203 [ curry 2dip pick over ] curry
1205 [ [ 2drop ] [ 2nipd ] if ] compose
1206 ] bi* compose 1 each-from drop ; inline
1210 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1211 [ after? ] select-by ; inline
1213 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1214 [ before? ] select-by ; inline
1216 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1218 : longest ( seqs -- elt ) [ length ] supremum-by ;
1220 ! We hand-optimize flip to such a degree because type hints
1221 ! cannot express that an array is an array of arrays yet, and
1222 ! this word happens to be performance-critical since the compiler
1223 ! itself uses it. Optimizing it like this reduced compile time.
1226 : generic-flip ( matrix -- newmatrix )
1227 [ [ length ] [ min ] map-reduce ] keep
1228 '[ _ [ nth-unsafe ] with { } map-as ] map-integers ; inline
1232 : array-flip ( matrix -- newmatrix )
1234 [ [ { array } declare length>> ] [ min ] map-reduce ] keep
1235 '[ _ [ { array } declare array-nth ] with { } map-as ] map-integers ;
1239 : flip ( matrix -- newmatrix )
1243 [ array-flip ] [ generic-flip ] if
1244 ] [ generic-flip ] if