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 : new-sequence-like ( len-exemplar type-exemplar -- newseq )
19 [ length ] dip new-sequence ; inline
21 : new-resizable-like ( len-exemplar type-exemplar -- newseq )
22 [ length ] dip new-resizable ; inline
24 : new-like ( len exemplar quot -- seq )
25 over [ [ new-sequence ] dip call ] dip like ; inline
27 M: sequence like drop ; inline
29 GENERIC: lengthen ( n seq -- )
30 GENERIC: shorten ( n seq -- )
32 M: sequence lengthen 2dup length > [ set-length ] [ 2drop ] if ; inline
33 M: sequence shorten 2dup length < [ set-length ] [ 2drop ] if ; inline
35 : 2length ( seq1 seq2 -- n1 n2 ) [ length ] bi@ ; inline
36 : 3length ( seq1 seq2 seq3 -- n1 n2 n3 ) [ length ] tri@ ; inline
38 : empty? ( seq -- ? ) length 0 = ; inline
40 : if-empty ( ..a seq quot1: ( ..a -- ..b ) quot2: ( ..a seq -- ..b ) -- ..b )
41 [ dup empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
43 : when-empty ( ... seq quot: ( ... -- ... obj ) -- ... seq/obj ) [ ] if-empty ; inline
44 : unless-empty ( ... seq quot: ( ... seq -- ... ) -- ... ) [ ] swap if-empty ; inline
46 : delete-all ( seq -- ) 0 swap set-length ;
48 : first ( seq -- first ) 0 swap nth ; inline
49 : second ( seq -- second ) 1 swap nth ; inline
50 : third ( seq -- third ) 2 swap nth ; inline
51 : fourth ( seq -- fourth ) 3 swap nth ; inline
53 : set-first ( first seq -- ) 0 swap set-nth ; inline
54 : set-second ( second seq -- ) 1 swap set-nth ; inline
55 : set-third ( third seq -- ) 2 swap set-nth ; inline
56 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
58 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
60 ERROR: bounds-error index seq ;
62 GENERIC#: bounds-check? 1 ( n seq -- ? )
64 M: integer bounds-check?
65 dupd length < [ 0 >= ] [ drop f ] if ; inline
67 : bounds-check ( n seq -- n seq )
68 2dup bounds-check? [ bounds-error ] unless ; inline
70 MIXIN: immutable-sequence
72 ERROR: immutable element index sequence ;
74 M: immutable-sequence set-nth immutable ;
76 INSTANCE: immutable-sequence sequence
80 : array-nth ( n array -- elt )
81 swap 2 fixnum+fast slot ; inline
83 : set-array-nth ( elt n array -- )
84 swap 2 fixnum+fast set-slot ; inline
86 : dispatch ( n array -- ) array-nth call ;
88 GENERIC: resize ( n seq -- newseq ) flushable
90 ! Unsafe sequence protocol for inner loops
91 GENERIC: nth-unsafe ( n seq -- elt ) flushable
92 GENERIC: set-nth-unsafe ( elt n seq -- )
94 M: sequence nth bounds-check nth-unsafe ; inline
95 M: sequence set-nth bounds-check set-nth-unsafe ; inline
97 M: sequence nth-unsafe nth ; inline
98 M: sequence set-nth-unsafe set-nth ; inline
100 : change-nth-unsafe ( i seq quot -- )
101 [ [ nth-unsafe ] dip call ] 2keepd set-nth-unsafe ; inline
105 ! The f object supports the sequence protocol trivially
106 M: f length drop 0 ; inline
107 M: f nth-unsafe nip ; inline
108 M: f like drop [ f ] when-empty ; inline
110 INSTANCE: f immutable-sequence
113 TUPLE: iota { n integer read-only } ;
115 ERROR: non-negative-integer-expected n ;
117 : <iota> ( n -- iota )
118 dup 0 < [ non-negative-integer-expected ] when
121 M: iota length n>> ; inline
122 M: iota nth-unsafe drop ; inline
124 INSTANCE: iota immutable-sequence
128 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
129 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
130 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
131 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
133 : first2-unsafe ( seq -- first second )
134 [ first-unsafe ] [ second-unsafe ] bi ; inline
136 : first3-unsafe ( seq -- first second third )
137 [ first2-unsafe ] [ third-unsafe ] bi ; inline
139 : first4-unsafe ( seq -- first second third fourth )
140 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
142 : exchange-unsafe ( m n seq -- )
143 [ [ nth-unsafe ] curry bi@ ]
144 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
146 : (1sequence) ( obj seq -- seq )
147 [ 0 swap set-nth-unsafe ] keep ; inline
149 : (2sequence) ( obj1 obj2 seq -- seq )
150 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
152 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
153 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
155 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
156 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
160 : head-to-index ( seq to -- zero to seq ) [ 0 ] 2dip swap ; inline
162 : index-to-tail ( seq from -- from length seq ) swap [ length ] keep ; inline
164 : from-tail ( seq n -- seq n' ) [ dup length ] dip - ; inline
166 : 1sequence ( obj exemplar -- seq )
167 1 swap [ (1sequence) ] new-like ; inline
169 : 2sequence ( obj1 obj2 exemplar -- seq )
170 2 swap [ (2sequence) ] new-like ; inline
172 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
173 3 swap [ (3sequence) ] new-like ; inline
175 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
176 4 swap [ (4sequence) ] new-like ; inline
178 : first2 ( seq -- first second )
179 1 swap bounds-check nip first2-unsafe ; inline
181 : first3 ( seq -- first second third )
182 2 swap bounds-check nip first3-unsafe ; inline
184 : first4 ( seq -- first second third fourth )
185 3 swap bounds-check nip first4-unsafe ; inline
187 : ?nth ( n seq -- elt/f )
188 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
190 : ?set-nth ( elt n seq -- )
191 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
193 : index-or-length ( seq n -- seq n' ) over length min ; inline
195 : index-of-last ( seq -- n seq ) [ length 1 - ] keep ; inline
197 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
198 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
199 : ?last ( seq -- elt/f )
200 index-of-last over 0 <
201 [ 2drop f ] [ nth-unsafe ] if ; inline
203 MIXIN: virtual-sequence
204 GENERIC: virtual-exemplar ( seq -- seq' )
205 GENERIC: virtual@ ( n seq -- n' seq' )
207 M: virtual-sequence nth virtual@ nth ; inline
208 M: virtual-sequence set-nth virtual@ set-nth ; inline
209 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
210 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
211 M: virtual-sequence like virtual-exemplar like ; inline
212 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
214 INSTANCE: virtual-sequence sequence
216 ! A reversal of an underlying sequence.
217 TUPLE: reversed { seq read-only } ;
219 C: <reversed> reversed
221 M: reversed virtual-exemplar seq>> ; inline
222 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
223 M: reversed length seq>> length ; inline
225 INSTANCE: reversed virtual-sequence
227 ! A slice of another sequence.
229 { from integer read-only }
230 { to integer read-only }
233 : >slice< ( slice -- from to seq )
234 [ from>> ] [ to>> ] [ seq>> ] tri ; inline
236 : collapse-slice ( m n slice -- m' n' seq )
237 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
239 ERROR: slice-error from to seq ;
241 : check-slice ( from to seq -- from to seq )
242 pick 0 < [ slice-error ] when
243 2dup length > [ slice-error ] when
244 2over > [ slice-error ] when ; inline
248 : <slice-unsafe> ( from to seq -- slice )
249 dup slice? [ collapse-slice ] when slice boa ; inline
253 : <slice> ( from to seq -- slice )
254 check-slice <slice-unsafe> ; inline
256 M: slice virtual-exemplar seq>> ; inline
258 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
260 M: slice length [ to>> ] [ from>> ] bi - ; inline
262 : head-slice ( seq n -- slice ) head-to-index <slice> ; inline
264 : tail-slice ( seq n -- slice ) index-to-tail <slice> ; inline
266 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
268 : head-slice* ( seq n -- slice ) from-tail head-slice ; inline
270 : tail-slice* ( seq n -- slice ) from-tail tail-slice ; inline
272 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
274 INSTANCE: slice virtual-sequence
276 ! One element repeated many times
278 { length integer read-only }
281 : <repetition> ( len elt -- repetition )
282 over 0 < [ non-negative-integer-expected ] when
283 repetition boa ; inline
285 M: repetition length length>> ; inline
286 M: repetition nth-unsafe nip elt>> ; inline
288 INSTANCE: repetition immutable-sequence
292 ERROR: integer-length-expected obj ;
294 ! The check-length call forces partial dispatch
295 : check-length ( n -- n )
296 dup integer? [ integer-length-expected ] unless ; inline
298 : >sequence< ( seq -- i n seq )
299 [ drop 0 ] [ length check-length ] [ ] tri ; inline
301 : length-sequence ( seq -- n seq )
302 [ length check-length ] [ ] bi ; inline
304 : >underlying< ( slice/seq -- from to slice/seq )
305 dup slice? [ >slice< ] [ >sequence< ] if ; inline
308 { src-i integer read-only }
310 { dst-i integer read-only }
315 : copy-nth-unsafe ( n copy -- )
316 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
317 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
319 : (copy) ( n copy -- dst )
320 over 0 <= [ nip dst>> ] [
321 [ 1 - ] dip [ copy-nth-unsafe ] [ (copy) ] 2bi
322 ] if ; inline recursive
324 : subseq>copy ( from to seq -- n copy )
325 [ over - check-length swap ] dip
326 3dup nip new-sequence 0 swap <copier> ; inline
328 : bounds-check-head ( n seq -- n seq )
329 over 0 < [ bounds-error ] when ; inline
331 : check-copy ( src n dst -- src n dst )
332 3dup bounds-check-head
333 [ swap length + ] dip lengthen ; inline
335 : copy-unsafe ( src i dst -- )
336 [ [ length check-length 0 ] keep ] 2dip <copier> (copy) drop ; inline
338 : subseq-unsafe-as ( from to seq exemplar -- subseq )
339 [ subseq>copy (copy) ] dip like ; inline
341 : subseq-unsafe ( from to seq -- subseq )
342 dup subseq-unsafe-as ; inline
346 : subseq-as ( from to seq exemplar -- subseq )
347 [ check-slice ] dip subseq-unsafe-as ;
349 : subseq ( from to seq -- subseq )
352 : head ( seq n -- headseq ) head-to-index subseq ;
354 : tail ( seq n -- tailseq ) index-to-tail subseq ;
356 : rest ( seq -- tailseq ) 1 tail ;
358 : head* ( seq n -- headseq ) from-tail head ;
360 : tail* ( seq n -- tailseq ) from-tail tail ;
362 : but-last ( seq -- headseq ) 1 head* ;
364 : copy ( src i dst -- ) check-copy copy-unsafe ; inline
366 M: sequence clone-like
367 dupd new-sequence-like [ 0 swap copy-unsafe ] keep ; inline
369 M: immutable-sequence clone-like like ; inline
371 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
375 : (append) ( seq1 seq2 accum -- accum )
376 [ [ over length ] dip copy-unsafe ]
377 [ 0 swap copy-unsafe ]
382 : append-as ( seq1 seq2 exemplar -- newseq )
383 [ 2dup 2length + ] dip
384 [ (append) ] new-like ; inline
386 : append ( seq1 seq2 -- newseq ) over append-as ;
388 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
390 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
392 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
393 [ 3dup 3length + + ] dip [
394 [ [ 2over 2length + ] dip copy-unsafe ]
398 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
400 : surround-as ( seq1 seq2 seq3 exemplar -- newseq )
401 [ swap ] 2dip 3append-as ; inline
403 : surround ( seq1 seq2 seq3 -- newseq ) over surround-as ; inline
405 : 1surround-as ( seq1 seq2 exemplar -- newseq ) dupd surround-as ; inline
407 : 1surround ( seq1 seq2 -- newseq ) dup 1surround-as ; inline
409 : glue-as ( seq1 seq2 seq3 exemplar -- newseq ) swapd 3append-as ; inline
411 : glue ( seq1 seq2 seq3 -- newseq ) pick glue-as ; inline
413 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
414 [ [ nth ] dip call ] 2keepd set-nth-unsafe ; inline
416 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
418 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
422 : sequence-operator ( seq quot -- i n quot' )
423 [ >underlying< [ nth-unsafe ] curry ] dip compose ; inline
425 : length-iterator ( seq -- n quot' )
426 length-sequence [ nth-unsafe ] curry ; inline
428 : length-operator ( seq quot -- n quot' )
429 [ length-iterator ] dip compose ; inline
431 : collect-into ( quot into -- quot' )
432 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
434 : collect-from ( i n quot into -- )
435 collect-into each-integer-from ; inline
437 : collect ( n quot into -- )
438 collect-into each-integer ; inline
440 : sequence-index-operator ( seq quot -- n quot' )
441 [ length-iterator [ keep ] curry ] dip compose ; inline
443 : map-into ( seq quot into -- )
444 [ length-operator ] dip collect ; inline
446 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
447 [ nth-unsafe ] bi-curry@ bi ; inline
449 : setup-2each ( seq1 seq2 -- n quot )
450 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
452 : (2each) ( seq1 seq2 quot -- n quot' )
453 [ setup-2each ] dip compose ; inline
455 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
456 [ nth-unsafe ] tri-curry@ tri ; inline
458 : setup-3each ( seq1 seq2 seq3 -- n quot )
459 [ [ length ] tri@ min min check-length ]
460 [ [ 3nth-unsafe ] 3curry ] 3bi ; inline
462 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
463 [ setup-3each ] dip compose ; inline
465 : element/index ( i/f seq -- elt/f i/f )
466 '[ [ _ nth ] [ f ] if* ] keep ; inline
468 : index/element ( i/f seq -- i/f elt/f )
469 dupd '[ _ nth ] [ f ] if* ; inline
471 : (accumulate) ( seq identity quot -- identity seq quot' )
472 swapd [ keepd ] curry ; inline
474 : (accumulate*) ( seq identity quot -- identity seq quot' )
475 swapd [ dup ] compose ; inline
479 : each ( ... seq quot: ( ... x -- ... ) -- ... )
480 sequence-operator each-integer-from ; inline
482 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
483 -rot length-operator each-integer-from ; inline
485 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
488 : map-integers-from-as ( ... from len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
489 overd [ [ collect-from ] keep ] new-like ; inline
491 : map-integers-as ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
492 overd [ [ collect ] keep ] new-like ; inline
494 : map-integers ( ... len quot: ( ... i -- ... elt ) -- ... newseq )
495 { } map-integers-as ; inline
497 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
498 [ length-operator ] dip map-integers-as ; inline
500 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
503 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
504 [ [ drop ] prepose ] dip map-integers-as ; inline
506 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
507 { } replicate-as ; inline
509 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
510 over [ map-into ] keep ; inline
512 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
513 [ (accumulate) ] dip map-as ; inline
515 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
516 pick accumulate-as ; inline
518 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
519 (accumulate) map! ; inline
521 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
522 [ (accumulate*) ] dip map-as nip ; inline
524 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
525 pick accumulate*-as ; inline
527 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
528 (accumulate*) map! nip ; inline
530 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
531 (2each) each-integer ; inline
533 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) i -- ... )
534 [ (2each) ] dip -rot each-integer-from ; inline
536 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
539 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
540 [ (2each) ] dip map-integers-as ; inline
542 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
543 pick 2map-as ; inline
545 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
546 (2each) all-integers? ; inline
548 : 2any? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
549 negate 2all? not ; inline
551 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
552 (3each) each-integer ; inline
554 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
555 [ (3each) ] dip map-integers-as ; inline
557 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
558 pickd swap 3map-as ; inline
562 : bounds-check-call ( n seq quot -- elt i )
563 2over bounds-check? [ call ] [ 3drop f f ] if ; inline
565 : find-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
566 [ length-operator find-integer-from ] keepd
567 index/element ; inline
569 : find-last-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
570 [ length-operator nip find-last-integer ] keepd
571 index/element ; inline
575 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
576 '[ _ find-from-unsafe ] bounds-check-call ; inline
578 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
579 [ 0 ] 2dip find-from-unsafe ; inline
581 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
582 '[ _ find-last-from-unsafe ] bounds-check-call ; inline
584 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
585 [ index-of-last ] dip find-last-from ; inline
587 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
589 _ [ sequence-index-operator find-integer-from ] keepd
591 ] bounds-check-call ; inline
593 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
594 [ 0 ] 2dip find-index-from ; inline
596 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
597 sequence-operator all-integers-from? ; inline
599 : push-when ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
600 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
602 : keep-push-when ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
603 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
605 : call-push-when ( ..a elt quot: ( ..a elt -- ..b elt' ? ) accum -- ..b )
606 [ call ] dip swap [ push ] [ 2drop ] if ; inline
610 : (selector-as) ( quot length exemplar -- selector accum )
611 new-resizable [ [ push-when ] 2curry ] keep ; inline
615 : selector-as ( quot exemplar -- selector accum )
616 [ length ] keep (selector-as) ; inline
618 : selector ( quot -- selector accum )
619 V{ } selector-as ; inline
621 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
622 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
624 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
625 over filter-as ; inline
627 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
628 [ negate ] [ filter-as ] bi* ; inline
630 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
631 over reject-as ; inline
633 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
634 [ keep swap ] 2dip ? push ; inline
636 : 2selector ( quot -- selector accum1 accum2 )
637 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
639 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
640 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
642 : collector-for-as ( seq quot exemplar -- seq quot' vec )
643 overd new-resizable-like [ [ push ] curry compose ] keep ; inline
645 : collector-as ( quot exemplar -- quot' vec )
646 dup new-resizable-like [ [ push ] curry compose ] keep ; inline
648 : collector-for ( seq quot -- seq quot' vec )
649 V{ } collector-for-as ; inline
651 : collector ( quot -- quot' vec )
652 V{ } collector-as ; inline
654 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
655 dup [ collector-as [ while ] dip ] curry dip like ; inline
657 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
658 { } produce-as ; inline
660 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
661 [ dup ] swap [ keep ] curry produce nip ; inline
663 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
664 sequence-index-operator each-integer ; inline
666 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
667 [ dup length <iota> ] 2dip 2map-as ; inline
669 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
670 over map-index-as ; inline
672 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
673 pick empty? [ 3drop ] [
674 [ [ drop first-unsafe ] dip call ]
675 [ [ bi* ] 2curry 1 each-from ]
679 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
680 swapd each-index ; inline
682 : index ( obj seq -- n )
683 [ = ] with find drop ;
685 : index-from ( obj i seq -- n )
686 rot [ = ] curry find-from drop ;
688 : last-index ( obj seq -- n )
689 [ = ] with find-last drop ;
691 : last-index-from ( obj i seq -- n )
692 rot [ = ] curry find-last-from drop ;
694 : indices ( obj seq -- indices )
695 swap [ = ] curry [ swap ] prepose V{ } clone [
696 [ push ] curry [ [ drop ] if ] curry compose each-index
701 : nths-unsafe ( indices seq -- seq' )
702 [ [ nth-unsafe ] curry ] keep map-as ;
706 : nths ( indices seq -- seq' )
707 [ [ nth ] curry ] keep map-as ;
709 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
710 find drop >boolean ; inline
712 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
715 : member? ( elt seq -- ? )
718 : member-eq? ( elt seq -- ? )
721 : remove ( elt seq -- newseq )
724 : remove-eq ( elt seq -- newseq )
725 [ eq? ] with reject ;
727 : sift ( seq -- newseq )
730 : harvest ( seq -- newseq )
735 : mismatch-unsafe ( n seq1 seq2 -- i )
736 [ 2nth-unsafe = not ] 2curry find-integer ; inline
740 : mismatch ( seq1 seq2 -- i )
741 [ min-length ] 2keep mismatch-unsafe ;
744 [ mismatch ] 2keep pick
745 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
747 : sequence= ( seq1 seq2 -- ? )
748 2dup [ length ] bi@ dupd =
749 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
751 ERROR: assert-sequence got expected ;
753 : assert-sequence= ( a b -- )
754 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
756 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
758 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
762 : sequence-hashcode-step ( oldhash newpart -- newhash )
763 integer>fixnum swap [
764 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
765 fixnum+fast fixnum+fast
766 ] keep fixnum-bitxor ; inline
770 : sequence-hashcode ( n seq -- x )
771 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
773 M: sequence hashcode* [ sequence-hashcode ] recursive-hashcode ;
776 over 0 <= [ 2drop 0 ] [
777 nip length 0 swap [ sequence-hashcode-step ] each-integer
780 M: reversed hashcode* [ sequence-hashcode ] recursive-hashcode ;
782 M: slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
784 : move ( to from seq -- )
786 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
790 : move-unsafe* ( to from seq -- from-nth )
793 [ [ nth-unsafe tuck swap ] [ set-nth-unsafe ] bi ] if ; inline
795 : filter-from! ( store from seq quot: ( ... elt -- ... ? ) -- seq )
797 [ [ move-unsafe* ] dip call ] 4keep
798 [ swap [ 1 + ] when ] 3dip
799 [ 1 + ] 2dip filter-from!
800 ] [ drop [ nip set-length ] keep ] if ; inline recursive
802 : move-unsafe ( to from seq -- )
804 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
808 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
809 [ 0 0 ] 2dip filter-from! ; inline
811 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
812 negate filter! ; inline
814 : remove! ( elt seq -- seq )
817 : remove-eq! ( elt seq -- seq )
818 [ eq? ] with reject! ;
820 : prefix ( seq elt -- newseq )
821 over [ over length 1 + ] dip [
822 (1sequence) [ 1 swap copy-unsafe ] keep
825 : suffix ( seq elt -- newseq )
826 over [ over length 1 + ] dip [
827 [ [ over length ] dip set-nth-unsafe ] keep
828 [ 0 swap copy-unsafe ] keep
831 : suffix! ( seq elt -- seq ) over push ; inline
833 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
835 : last ( seq -- elt )
837 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
841 : last-unsafe ( seq -- elt )
842 index-of-last nth-unsafe ; inline
846 : set-last ( elt seq -- )
848 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
850 : pop* ( seq -- ) index-of-last shorten ;
854 : move-backward ( shift from to seq -- )
858 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
862 : move-forward ( shift from to seq -- )
866 [ [ [ ] [ nip + ] [ 2nip ] 3tri ] dip move-unsafe 1 - ] keep
870 : (open-slice) ( shift from to seq ? -- )
872 [ [ 1 - ] bi@ ] dip move-forward
874 [ over - ] 2dip move-backward
877 : open-slice ( shift from seq -- )
881 [ ] [ nip length + ] [ 2nip ] 3tri
882 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
888 : delete-slice ( from to seq -- )
889 check-slice [ over [ - ] dip ] dip open-slice ;
891 : remove-nth! ( n seq -- seq )
892 [ [ dup 1 + ] dip delete-slice ] keep ;
894 : snip ( from to seq -- head tail )
895 [ swap head ] [ swap tail ] bi-curry bi* ; inline
897 : snip-slice ( from to seq -- head tail )
898 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
900 : replace-slice ( new from to seq -- seq' )
901 snip-slice surround ;
903 : remove-nth ( n seq -- seq' )
904 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
907 index-of-last over 0 >=
908 [ [ nth-unsafe ] [ shorten ] 2bi ]
909 [ bounds-error ] if ;
911 : exchange ( m n seq -- )
912 [ nip bounds-check 2drop ]
913 [ bounds-check 3drop ]
917 : midpoint@ ( seq -- n ) length 2/ ; inline
919 : reverse! ( seq -- seq )
921 [ midpoint@ ] [ length ] [ ] tri
922 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
926 : reverse ( seq -- newseq )
928 dup [ length ] keep new-sequence
929 [ 0 swap copy-unsafe ] keep reverse!
932 GENERIC: sum-lengths ( seq -- n )
934 M: object sum-lengths
935 0 [ length + ] reduce ;
937 M: repetition sum-lengths
938 [ length>> ] [ elt>> length ] bi * ;
940 : concat-as ( seq exemplar -- newseq )
942 [ dup sum-lengths ] dip new-resizable
943 [ [ push-all ] curry each ] keep
946 : concat ( seq -- newseq )
947 [ { } ] [ dup first concat-as ] if-empty ;
951 : joined-length ( seq glue -- n )
952 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
956 : join-as ( seq glue exemplar -- newseq )
957 over empty? [ nip concat-as ] [
959 2dup joined-length over new-resizable [
960 [ [ push-all ] 2curry ]
961 [ nip [ push-all ] curry ] 2bi
967 : join ( seq glue -- newseq )
972 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
974 [ over length [-] dup 0 = [ drop ] ] dip
975 [ <repetition> ] curry
976 ] dip compose if ; inline
980 : pad-head ( seq n elt -- padded )
981 [ swap dup append-as ] padding ;
983 : pad-tail ( seq n elt -- padded )
986 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ; inline
987 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ; inline
988 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
989 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
991 : head? ( seq begin -- ? )
995 [ length [ head-slice ] keep swap ] keep
999 : tail? ( seq end -- ? )
1003 [ length [ tail-slice* ] keep swap ] keep
1007 : cut-slice ( seq n -- before-slice after-slice )
1008 [ head-slice ] [ tail-slice ] 2bi ; inline
1010 : cut-slice* ( seq n -- before-slice after-slice )
1011 [ head-slice* ] [ tail-slice* ] 2bi ;
1013 : insert-nth ( elt n seq -- seq' )
1014 swap cut-slice [ swap suffix ] dip append ;
1016 : halves ( seq -- first-slice second-slice )
1017 dup midpoint@ cut-slice ; inline
1021 : nth2-unsafe ( n seq -- a b )
1022 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
1024 : nth3-unsafe ( n seq -- a b c )
1025 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
1027 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
1028 ! We can't use case here since combinators depends on
1033 [ 2nip swap nth-unsafe ]
1034 [ -rot [ drop swap nth2-unsafe ] dip call ]
1035 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
1038 [ 2/ ] [ over - ] bi [ 2dup + ] dip
1039 [ (binary-reduce) ] [ 2curry ] curry 2bi@
1040 pick [ 3bi ] dip call
1041 ] if ; inline recursive
1045 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
1047 [ seq>> ] 3dip [ from>> 0 max ] [ to>> 0 max over - ] bi
1050 ] if (binary-reduce) ; inline
1052 : cut ( seq n -- before after )
1053 [ head ] [ tail ] 2bi ;
1055 : cut* ( seq n -- before after )
1056 [ head* ] [ tail* ] 2bi ;
1058 : subseq-starts-at? ( i seq subseq -- ? )
1059 [ length swap ] keep
1061 [ + _ nth-unsafe ] keep _ nth-unsafe =
1062 ] with all-integers? ; inline
1064 : subseq-index-from ( n seq subseq -- i/f )
1065 [ [ length ] bi@ - 1 + ] 2keep
1066 '[ _ _ subseq-starts-at? ] find-integer-from ; inline
1068 : subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
1070 : subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
1072 : subseq-start-from ( subseq seq n -- i/f )
1073 spin subseq-index-from ; inline deprecated
1075 : subseq-start ( subseq seq -- i/f ) swap subseq-index ; inline deprecated
1077 : subseq? ( subseq seq -- ? ) subseq-start >boolean ; inline deprecated
1079 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
1080 2dup mismatch [ 2dup min-length ] unless*
1081 [ tail-slice ] curry bi@ ;
1083 : unclip ( seq -- rest first )
1084 [ rest ] [ first-unsafe ] bi ;
1086 : unclip-last ( seq -- butlast last )
1087 [ but-last ] [ last-unsafe ] bi ;
1089 : unclip-slice ( seq -- rest-slice first )
1090 [ rest-slice ] [ first-unsafe ] bi ; inline
1092 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1093 [ [ [ first ] keep ] dip [ dip ] keep ] dip
1094 '[ swap _ dip swap @ ] 1 each-from ; inline
1096 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1097 [ [ [ [ first ] bi@ ] 2keep ] dip [ 2dip ] keep ] dip
1098 '[ rot _ dip swap @ ] 1 2each-from ; inline
1102 : (map-find) ( seq quot find-quot -- result elt )
1103 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1107 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1108 [ find ] (map-find) ; inline
1110 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1111 [ find-last ] (map-find) ; inline
1113 : unclip-last-slice ( seq -- butlast-slice last )
1114 [ but-last-slice ] [ last-unsafe ] bi ; inline
1118 : (trim-head) ( seq quot -- seq n )
1119 over [ negate find drop ] dip swap
1120 [ dup length ] unless* ; inline
1122 : (trim-tail) ( seq quot -- seq n )
1123 over [ negate find-last drop ?1+ ] dip
1128 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1129 (trim-head) tail-slice ; inline
1131 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1132 (trim-head) tail ; inline
1134 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1135 (trim-tail) head-slice ; inline
1137 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1138 (trim-tail) head ; inline
1140 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1141 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1143 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1144 [ trim-slice ] [ drop ] 2bi like ; inline
1146 GENERIC: sum ( seq -- n )
1147 M: object sum 0 [ + ] binary-reduce ; inline
1148 M: iota sum length dup 1 - * 2/ ; inline
1149 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1151 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1153 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1155 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1157 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1158 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1160 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1161 [ 1 0 ? ] compose map-sum ; inline
1163 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1164 [ with each ] 2curry each ; inline
1166 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1167 [ with { } map-as ] 2curry { } map-as ; inline
1169 : cartesian-product-as ( seq1 seq2 exemplar -- newseq )
1170 [ 2sequence ] curry cartesian-map ; inline
1172 : cartesian-product ( seq1 seq2 -- newseq )
1173 dup cartesian-product-as ; inline
1175 : cartesian-find ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... elt1 elt2 )
1176 [ f ] 3dip [ with find swap ] 2curry [ nip ] prepose find nip swap ; inline
1180 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1182 [ keep swap ] curry [ [ first ] dip call ] 2keep
1183 [ curry 2dip pick over ] curry
1185 [ [ 2drop ] [ 2nipd ] if ] compose
1186 ] bi* compose 1 each-from drop ; inline
1190 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1191 [ after? ] select-by ; inline
1193 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1194 [ before? ] select-by ; inline
1196 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1198 : longest ( seqs -- elt ) [ length ] supremum-by ;
1200 ! We hand-optimize flip to such a degree because type hints
1201 ! cannot express that an array is an array of arrays yet, and
1202 ! this word happens to be performance-critical since the compiler
1203 ! itself uses it. Optimizing it like this reduced compile time.
1206 : generic-flip ( matrix -- newmatrix )
1207 [ [ length ] [ min ] map-reduce ] keep
1208 '[ _ [ nth-unsafe ] with { } map-as ] map-integers ; inline
1212 : array-flip ( matrix -- newmatrix )
1214 [ [ { array } declare length>> ] [ min ] map-reduce ] keep
1215 '[ _ [ { array } declare array-nth ] with { } map-as ] map-integers ;
1219 : flip ( matrix -- newmatrix )
1223 [ array-flip ] [ generic-flip ] if
1224 ] [ generic-flip ] if