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 GENERIC#: seq-lengthen 1 ( seq n -- seq )
38 GENERIC#: seq-shorten 1 ( seq n -- seq )
40 : seq-set-length ( seq n -- seq ) [ swap set-length ] keepd ; inline
41 : nth-of ( seq n -- elt ) swap nth ; inline
42 : set-nth-of ( seq n elt -- seq ) spin [ set-nth ] keep ; inline
44 M: sequence seq-lengthen 2dup lengthd < [ seq-set-length ] [ drop ] if ; inline
45 M: sequence seq-shorten 2dup lengthd > [ seq-set-length ] [ drop ] if ; inline
47 : 2length ( seq1 seq2 -- n1 n2 ) [ length ] bi@ ; inline
48 : 3length ( seq1 seq2 seq3 -- n1 n2 n3 ) [ length ] tri@ ; inline
50 : empty? ( seq -- ? ) length 0 = ; inline
52 : if-empty ( ..a seq quot1: ( ..a -- ..b ) quot2: ( ..a seq -- ..b ) -- ..b )
53 [ dup empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
55 : when-empty ( ... seq quot: ( ... -- ... obj ) -- ... seq/obj ) [ ] if-empty ; inline
56 : unless-empty ( ... seq quot: ( ... seq -- ... ) -- ... ) [ ] swap if-empty ; inline
58 : delete-all ( seq -- ) 0 swap set-length ;
60 : first ( seq -- first ) 0 swap nth ; inline
61 : second ( seq -- second ) 1 swap nth ; inline
62 : third ( seq -- third ) 2 swap nth ; inline
63 : fourth ( seq -- fourth ) 3 swap nth ; inline
65 : set-first ( first seq -- ) 0 swap set-nth ; inline
66 : set-second ( second seq -- ) 1 swap set-nth ; inline
67 : set-third ( third seq -- ) 2 swap set-nth ; inline
68 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
70 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
72 : seq-push ( seq elt -- seq ) [ dup length ] dip set-nth-of ;
74 ERROR: bounds-error index seq ;
76 GENERIC#: bounds-check? 1 ( n seq -- ? )
78 M: integer bounds-check?
79 dupd length < [ 0 >= ] [ drop f ] if ; inline
81 GENERIC: seq-bounds-check? ( seq n -- ? )
83 M: integer seq-bounds-check?
84 tuck lengthd > [ 0 >= ] [ drop f ] if ; inline
86 : bounds-check ( n seq -- n seq )
87 2dup bounds-check? [ bounds-error ] unless ; inline
89 : seq-bounds-check ( seq n -- seq n )
90 2dup seq-bounds-check? [ swap bounds-error ] unless ; inline
92 MIXIN: immutable-sequence
94 ERROR: immutable element index sequence ;
96 M: immutable-sequence set-nth immutable ;
98 INSTANCE: immutable-sequence sequence
102 : array-nth ( n array -- elt )
103 swap 2 fixnum+fast slot ; inline
105 : set-array-nth ( elt n array -- )
106 swap 2 fixnum+fast set-slot ; inline
108 : dispatch ( n array -- ) array-nth call ;
110 GENERIC: resize ( n seq -- newseq ) flushable
112 ! Unsafe sequence protocol for inner loops
113 GENERIC: nth-unsafe ( n seq -- elt ) flushable
114 GENERIC: set-nth-unsafe ( elt n seq -- )
116 M: sequence nth bounds-check nth-unsafe ; inline
117 M: sequence set-nth bounds-check set-nth-unsafe ; inline
119 M: sequence nth-unsafe nth ; inline
120 M: sequence set-nth-unsafe set-nth ; inline
122 : nth-of-unsafe ( seq n -- elt ) swap nth-unsafe ; inline
124 : set-nth-of-unsafe ( seq n elt -- seq ) swap pick set-nth-unsafe ; inline
126 : change-nth-unsafe ( i seq quot -- )
127 [ [ nth-unsafe ] dip call ] 2keepd set-nth-unsafe ; inline
129 : change-nth-of-unsafe ( seq i quot -- seq )
130 [ [ nth-of-unsafe ] dip call ] 2keepd rot set-nth-of-unsafe ; inline
134 ! The f object supports the sequence protocol trivially
135 M: f length drop 0 ; inline
136 M: f nth-unsafe nip ; inline
137 M: f like drop [ f ] when-empty ; inline
139 INSTANCE: f immutable-sequence
142 TUPLE: iota { n integer read-only } ;
144 ERROR: non-negative-integer-expected n ;
146 : ensure-non-negative ( n -- n )
147 dup 0 < [ non-negative-integer-expected ] when ; inline
149 : <iota> ( n -- iota )
150 ensure-non-negative iota boa ; inline
152 M: iota length n>> ; inline
153 M: iota nth-unsafe drop ; inline
155 INSTANCE: iota immutable-sequence
159 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
160 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
161 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
162 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
164 : first2-unsafe ( seq -- first second )
165 [ first-unsafe ] [ second-unsafe ] bi ; inline
167 : first3-unsafe ( seq -- first second third )
168 [ first2-unsafe ] [ third-unsafe ] bi ; inline
170 : first4-unsafe ( seq -- first second third fourth )
171 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
173 : exchange-unsafe ( m n seq -- )
174 [ [ nth-unsafe ] curry bi@ ]
175 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
177 : (1sequence) ( obj seq -- seq )
178 [ 0 swap set-nth-unsafe ] keep ; inline
180 : (2sequence) ( obj1 obj2 seq -- seq )
181 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
183 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
184 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
186 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
187 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
191 : head-to-index ( seq to -- zero to seq ) [ 0 ] 2dip swap ; inline
193 : index-to-tail ( seq from -- from length seq ) swap [ length ] keep ; inline
195 : from-tail ( seq n -- seq n' ) [ dup length ] dip - ; inline
197 : 1sequence ( obj exemplar -- seq )
198 1 swap [ (1sequence) ] new-like ; inline
200 : 2sequence ( obj1 obj2 exemplar -- seq )
201 2 swap [ (2sequence) ] new-like ; inline
203 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
204 3 swap [ (3sequence) ] new-like ; inline
206 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
207 4 swap [ (4sequence) ] new-like ; inline
209 : first2 ( seq -- first second )
210 1 swap bounds-check nip first2-unsafe ; inline
212 : first3 ( seq -- first second third )
213 2 swap bounds-check nip first3-unsafe ; inline
215 : first4 ( seq -- first second third fourth )
216 3 swap bounds-check nip first4-unsafe ; inline
218 : ??nth ( n seq -- elt/f ? )
219 2dup bounds-check? [ nth-unsafe t ] [ 2drop f f ] if ; inline
221 : ?nth ( n seq -- elt/f )
224 : ?set-nth ( elt n seq -- )
225 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
227 : ?nth-of ( seq n -- elt/f ) swap ?nth ; inline
229 : ??nth-of ( seq n -- elt ? ) swap ??nth ; inline
231 : index-or-length ( seq n -- seq n' ) over length min ; inline
233 : index-of-last ( seq -- n seq ) [ length 1 - ] keep ; inline
235 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
236 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
237 : ?last ( seq -- elt/f )
238 index-of-last over 0 <
239 [ 2drop f ] [ nth-unsafe ] if ; inline
241 MIXIN: virtual-sequence
242 GENERIC: virtual-exemplar ( seq -- seq' )
243 GENERIC: virtual@ ( n seq -- n' seq' )
245 M: virtual-sequence nth virtual@ nth ; inline
246 M: virtual-sequence set-nth virtual@ set-nth ; inline
247 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
248 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
249 M: virtual-sequence like virtual-exemplar like ; inline
250 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
252 INSTANCE: virtual-sequence sequence
254 ! A reversal of an underlying sequence.
255 TUPLE: reversed { seq read-only } ;
257 C: <reversed> reversed
259 M: reversed virtual-exemplar seq>> ; inline
260 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
261 M: reversed length seq>> length ; inline
263 INSTANCE: reversed virtual-sequence
265 ! A slice of another sequence.
267 { from integer read-only }
268 { to integer read-only }
271 : >slice< ( slice -- from to seq )
272 [ from>> ] [ to>> ] [ seq>> ] tri ; inline
274 : collapse-slice ( m n slice -- m' n' seq )
275 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
277 ERROR: slice-error from to seq ;
279 : check-slice ( from to seq -- from to seq )
280 pick 0 < [ slice-error ] when
281 2dup length > [ slice-error ] when
282 2over > [ slice-error ] when ; inline
286 : <slice-unsafe> ( from to seq -- slice )
287 dup slice? [ collapse-slice ] when slice boa ; inline
291 : <slice> ( from to seq -- slice )
292 check-slice <slice-unsafe> ; inline
294 M: slice virtual-exemplar seq>> ; inline
296 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
298 M: slice length [ to>> ] [ from>> ] bi - ; inline
300 : head-slice ( seq n -- slice ) head-to-index <slice> ; inline
302 : tail-slice ( seq n -- slice ) index-to-tail <slice> ; inline
304 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
306 : head-slice* ( seq n -- slice ) from-tail head-slice ; inline
308 : tail-slice* ( seq n -- slice ) from-tail tail-slice ; inline
310 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
312 INSTANCE: slice virtual-sequence
314 ! One element repeated many times
316 { length integer read-only }
319 : <repetition> ( len elt -- repetition )
320 over 0 < [ non-negative-integer-expected ] when
321 repetition boa ; inline
323 M: repetition length length>> ; inline
324 M: repetition nth-unsafe nip elt>> ; inline
326 INSTANCE: repetition immutable-sequence
330 ERROR: integer-length-expected obj ;
332 ! The check-length call forces partial dispatch
333 : check-length ( n -- n )
334 dup integer? [ integer-length-expected ] unless ; inline
336 : >sequence< ( seq -- i n seq )
337 [ drop 0 ] [ length check-length ] [ ] tri ; inline
339 : length-sequence ( seq -- n seq )
340 [ length check-length ] [ ] bi ; inline
342 : >underlying< ( slice/seq -- from to slice/seq )
343 dup slice? [ >slice< ] [ >sequence< ] if ; inline
346 { src-i integer read-only }
348 { dst-i integer read-only }
353 : copy-nth-unsafe ( n copy -- )
354 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
355 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
357 : copy-nth-of-unsafe ( dst dst-i src src-i -- )
358 nth-of-unsafe set-nth-of-unsafe drop ; inline
360 : (copy) ( n copy -- dst )
361 over 0 <= [ nip dst>> ] [
362 [ 1 - ] dip [ copy-nth-unsafe ] [ (copy) ] 2bi
363 ] if ; inline recursive
365 : seq-copy-loop ( dst dst-i src src-i src-stop -- dst )
370 [ copy-nth-of-unsafe ] 4keep
373 ] if ; inline recursive
375 : subseq>copy ( from to seq -- n copy )
376 [ over - check-length swap ] dip
377 3dup nip new-sequence 0 swap <copier> ; inline
379 : bounds-check-head ( n seq -- n seq )
380 over 0 < [ bounds-error ] when ; inline
382 : check-grow-copy ( dst n src -- dst src n )
383 over [ lengthd + lengthen ] 2keep ; inline
385 : seq-grow-copy ( dst n -- dst dst-n )
386 [ over length + seq-lengthen ] keep 1 - ; inline
388 : copy-unsafe ( src i dst -- )
389 [ [ length check-length 0 ] keep ] 2dip <copier> (copy) drop ; inline
391 : seq-copy-unsafe ( dst dst-i src -- dst )
392 0 over length check-length seq-copy-loop ; inline
394 : subseq-unsafe-as ( from to seq exemplar -- subseq )
395 [ subseq>copy (copy) ] dip like ; inline
397 : subseq-unsafe ( from to seq -- subseq )
398 dup subseq-unsafe-as ; inline
402 : subseq-as ( from to seq exemplar -- subseq )
403 [ check-slice ] dip subseq-unsafe-as ;
405 : subseq ( from to seq -- subseq )
408 : head ( seq n -- headseq ) head-to-index subseq ;
410 : tail ( seq n -- tailseq ) index-to-tail subseq ;
412 : rest ( seq -- tailseq ) 1 tail ;
414 : head* ( seq n -- headseq ) from-tail head ;
416 : tail* ( seq n -- tailseq ) from-tail tail ;
418 : but-last ( seq -- headseq ) 1 head* ;
420 : copy ( src i dst -- )
421 3dup bounds-check-head
422 [ swap length + ] dip lengthen
425 : seq-copy ( dst dst-n src -- dst ) check-grow-copy seq-copy-unsafe ; inline
427 M: sequence clone-like
428 dupd new-sequence-like [ 0 swap copy-unsafe ] keep ; inline
430 M: immutable-sequence clone-like like ; inline
432 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
434 : seq-push-all ( dst src -- dst ) [ length seq-grow-copy ] keep seq-copy-unsafe ; inline
438 : (append) ( seq1 seq2 accum -- accum )
439 [ [ over length ] dip copy-unsafe ]
440 [ 0 swap copy-unsafe ]
443 : (seq-append) ( accum seq1 seq2 -- accum )
445 [ 0 ] dip [ seq-copy-unsafe ] [ length ] bi
446 ] dip seq-copy-unsafe ; inline
450 : seq-append-as ( seq1 seq2 exemplar -- newseq )
451 [ 2dup 2length + ] dip
452 [ -rot (seq-append) ] new-like ; inline
454 : append-as ( seq1 seq2 exemplar -- newseq )
455 [ 2dup 2length + ] dip
456 [ (append) ] new-like ; inline
458 : append ( seq1 seq2 -- newseq ) over append-as ;
460 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
462 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
464 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
465 [ 3dup 3length + + ] dip [
466 [ [ 2over 2length + ] dip copy-unsafe ]
470 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
472 : surround-as ( seq1 seq2 seq3 exemplar -- newseq )
473 [ swap ] 2dip 3append-as ; inline
475 : surround ( seq1 seq2 seq3 -- newseq ) over surround-as ; inline
477 : 1surround-as ( seq1 seq2 exemplar -- newseq ) dupd surround-as ; inline
479 : 1surround ( seq1 seq2 -- newseq ) dup 1surround-as ; inline
481 : glue-as ( seq1 seq2 seq3 exemplar -- newseq ) swapd 3append-as ; inline
483 : glue ( seq1 seq2 seq3 -- newseq ) pick glue-as ; inline
485 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
486 [ [ nth ] dip call ] 2keepd set-nth-unsafe ; inline
488 : min-length ( seq1 seq2 -- n ) 2length min ; inline
490 : max-length ( seq1 seq2 -- n ) 2length max ; inline
494 : sequence-operator ( seq quot -- i n quot' )
495 [ >underlying< [ nth-unsafe ] curry ] dip compose ; inline
497 : length-iterator ( seq -- n quot' )
498 length-sequence [ nth-unsafe ] curry ; inline
500 : length-operator ( seq quot -- n quot' )
501 [ length-iterator ] dip compose ; inline
503 : collect-into ( quot into -- quot' )
504 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
506 : collect-from ( i n quot into -- )
507 collect-into each-integer-from ; inline
509 : collect ( n quot into -- )
510 collect-into each-integer ; inline
512 : sequence-index-operator ( seq quot -- n quot' )
513 [ length-iterator [ keep ] curry ] dip compose ; inline
515 : map-into ( seq quot into -- )
516 [ length-operator ] dip collect ; inline
518 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
519 [ nth-unsafe ] bi-curry@ bi ; inline
521 : 2length-iterator ( seq1 seq2 -- n quot )
522 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
524 : 2length-operator ( seq1 seq2 quot -- n quot' )
525 [ 2length-iterator ] dip compose ; inline
527 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
528 [ nth-unsafe ] tri-curry@ tri ; inline
530 : 3length-iterator ( seq1 seq2 seq3 -- n quot )
531 [ 3length min min check-length ]
532 [ [ 3nth-unsafe ] 3curry ] 3bi ; inline
534 : 3length-operator ( seq1 seq2 seq3 quot -- n quot' )
535 [ 3length-iterator ] dip compose ; inline
537 : element/index ( i/f seq -- elt/f i/f )
538 '[ [ _ nth ] [ f ] if* ] keep ; inline
540 : index/element ( i/f seq -- i/f elt/f )
541 dupd '[ _ nth ] [ f ] if* ; inline
543 : (accumulate) ( seq identity quot -- identity seq quot' )
544 swapd [ keepd ] curry ; inline
546 : (accumulate*) ( seq identity quot -- identity seq quot' )
547 swapd [ dup ] compose ; inline
551 : each ( ... seq quot: ( ... x -- ... ) -- ... )
552 sequence-operator each-integer-from ; inline
554 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
555 -rot length-operator each-integer-from ; inline
557 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
560 : map-integers-from-as ( ... from len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
561 overd [ [ collect-from ] keep ] new-like ; inline
563 : map-integers-as ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
564 overd [ [ collect ] keep ] new-like ; inline
566 : map-integers ( ... len quot: ( ... i -- ... elt ) -- ... newseq )
567 { } map-integers-as ; inline
569 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
570 [ length-operator ] dip map-integers-as ; inline
572 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
575 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
576 [ [ drop ] prepose ] dip map-integers-as ; inline
578 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
579 { } replicate-as ; inline
581 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
582 over [ map-into ] keep ; inline
584 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
585 [ (accumulate) ] dip map-as ; inline
587 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
588 pick accumulate-as ; inline
590 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
591 (accumulate) map! ; inline
593 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
594 [ (accumulate*) ] dip map-as nip ; inline
596 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
597 pick accumulate*-as ; inline
599 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
600 (accumulate*) map! nip ; inline
602 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
603 2length-operator each-integer ; inline
605 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) from -- ... )
606 -roll 2length-operator each-integer-from ; inline
608 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
611 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
612 [ 2length-operator ] dip map-integers-as ; inline
614 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
615 pick 2map-as ; inline
617 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
618 2length-operator all-integers? ; inline
620 : 2any? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
621 negate 2all? not ; inline
623 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
624 3length-operator each-integer ; inline
626 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
627 [ 3length-operator ] dip map-integers-as ; inline
629 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
630 pickd swap 3map-as ; inline
634 : bounds-check-call ( n seq quot -- elt i )
635 2over bounds-check? [ call ] [ 3drop f f ] if ; inline
637 : find-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
638 [ length-operator find-integer-from ] keepd
639 index/element ; inline
641 : find-last-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
642 [ length-operator nip find-last-integer ] keepd
643 index/element ; inline
647 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
648 '[ _ find-from-unsafe ] bounds-check-call ; inline
650 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
651 [ 0 ] 2dip find-from-unsafe ; inline
653 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
654 '[ _ find-last-from-unsafe ] bounds-check-call ; inline
656 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
657 [ index-of-last ] dip find-last-from ; inline
659 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
661 _ [ sequence-index-operator find-integer-from ] keepd
663 ] bounds-check-call ; inline
665 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
666 [ 0 ] 2dip find-index-from ; inline
668 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
669 sequence-operator all-integers-from? ; inline
671 : push-when ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
672 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
674 : 2push-when ( ..a elt1 elt2 quot: ( ..a elt1 elt2 -- ..b ? ) accum -- ..b )
675 [ keepd ] dip rot [ push ] [ 2drop ] if ; inline
677 : call-push-when ( ..a elt quot: ( ..a elt -- ..b elt' ? ) accum -- ..b )
678 [ call ] dip swap [ push ] [ 2drop ] if ; inline
682 : (selector-as) ( quot length exemplar -- selector accum )
683 new-resizable [ [ push-when ] 2curry ] keep ; inline
685 : (2selector-as) ( quot length exemplar -- selector accum )
686 new-resizable [ [ 2push-when ] 2curry ] keep ; inline
690 : selector-as ( quot exemplar -- selector accum )
691 [ length ] keep (selector-as) ; inline
693 : selector ( quot -- selector accum )
694 V{ } selector-as ; inline
696 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
697 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
699 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
700 over filter-as ; inline
702 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
703 [ negate ] [ filter-as ] bi* ; inline
705 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
706 over reject-as ; inline
708 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
709 [ keep swap ] 2dip ? push ; inline
711 : 2selector ( quot -- selector accum1 accum2 )
712 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
714 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
715 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
717 : collector-as ( quot exemplar -- quot' vec )
718 dup new-resizable-like [ [ push ] curry compose ] keep ; inline
720 : collector ( quot -- quot' vec )
721 V{ } collector-as ; inline
723 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
724 dup [ collector-as [ while ] dip ] curry dip like ; inline
726 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
727 { } produce-as ; inline
729 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
730 [ dup ] swap [ keep ] curry produce nip ; inline
732 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
733 sequence-index-operator each-integer ; inline
735 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
736 [ dup length <iota> ] 2dip 2map-as ; inline
738 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
739 over map-index-as ; inline
741 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
742 pick empty? [ 3drop ] [
743 [ [ drop first-unsafe ] dip call ]
744 [ [ bi* ] 2curry 1 each-from ]
748 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
749 swapd each-index ; inline
751 : index ( obj seq -- n )
752 [ = ] with find drop ;
754 : index-from ( obj i seq -- n )
755 rot [ = ] curry find-from drop ;
757 : last-index ( obj seq -- n )
758 [ = ] with find-last drop ;
760 : last-index-from ( obj i seq -- n )
761 rot [ = ] curry find-last-from drop ;
763 : with-assoc ( assoc quot: ( ..a value key assoc -- ..b ) -- quot: ( ..a key value -- ..b ) )
764 curry [ swap ] prepose ; inline
766 : indices ( obj seq -- indices )
767 swap [ = ] with-assoc V{ } clone [
768 [ push ] curry [ [ drop ] if ] curry compose each-index
773 : nths-unsafe ( indices seq -- seq' )
774 [ [ nth-unsafe ] curry ] keep map-as ;
778 : nths ( indices seq -- seq' )
779 [ [ nth ] curry ] keep map-as ;
781 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
782 find drop >boolean ; inline
784 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
787 : member? ( elt seq -- ? )
790 : member-eq? ( elt seq -- ? )
793 : remove ( elt seq -- newseq )
796 : remove-eq ( elt seq -- newseq )
797 [ eq? ] with reject ;
799 : sift ( seq -- newseq )
802 : harvest ( seq -- newseq )
807 : mismatch-unsafe ( n seq1 seq2 -- i )
808 [ 2nth-unsafe = not ] 2curry find-integer ; inline
812 : mismatch ( seq1 seq2 -- i )
813 [ min-length ] 2keep mismatch-unsafe ;
816 [ mismatch ] 2keep pick
817 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
819 : sequence= ( seq1 seq2 -- ? )
821 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
823 ERROR: assert-sequence got expected ;
825 : assert-sequence= ( a b -- )
826 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
828 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
830 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
834 : sequence-hashcode-step ( oldhash newpart -- newhash )
835 integer>fixnum swap [
836 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
837 fixnum+fast fixnum+fast
838 ] keep fixnum-bitxor ; inline
842 : sequence-hashcode ( n seq -- x )
843 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
845 M: sequence hashcode* [ sequence-hashcode ] recursive-hashcode ;
848 over 0 <= [ 2drop 0 ] [
849 nip length 0 swap [ sequence-hashcode-step ] each-integer
852 M: reversed hashcode* [ sequence-hashcode ] recursive-hashcode ;
854 M: slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
856 : move ( to from seq -- )
858 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
862 : move-unsafe* ( to from seq -- from-nth )
865 [ [ nth-unsafe tuck swap ] [ set-nth-unsafe ] bi ] if ; inline
867 : filter-from! ( store from seq quot: ( ... elt -- ... ? ) -- seq )
869 [ [ move-unsafe* ] dip call ] 4keep
870 [ swap [ 1 + ] when ] 3dip
871 [ 1 + ] 2dip filter-from!
872 ] [ drop [ nip set-length ] keep ] if ; inline recursive
874 : move-unsafe ( to from seq -- )
876 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
880 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
881 [ 0 0 ] 2dip filter-from! ; inline
883 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
884 negate filter! ; inline
886 : remove! ( elt seq -- seq )
889 : remove-eq! ( elt seq -- seq )
890 [ eq? ] with reject! ;
892 : prefix ( seq elt -- newseq )
893 over [ over length 1 + ] dip [
894 (1sequence) [ 1 swap copy-unsafe ] keep
897 : suffix ( seq elt -- newseq )
898 over [ over length 1 + ] dip [
899 [ [ over length ] dip set-nth-unsafe ] keep
900 [ 0 swap copy-unsafe ] keep
903 : suffix! ( seq elt -- seq ) over push ; inline
905 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
907 : last ( seq -- elt )
909 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
913 : last-unsafe ( seq -- elt )
914 index-of-last nth-unsafe ; inline
918 : set-last ( elt seq -- )
920 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
922 : pop* ( seq -- ) index-of-last shorten ;
926 : move-backward ( shift from to seq -- )
930 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
934 : move-forward ( shift from to seq -- )
938 [ [ [ ] [ nip + ] [ 2nip ] 3tri ] dip move-unsafe 1 - ] keep
942 : (open-slice) ( shift from to seq ? -- )
944 [ [ 1 - ] bi@ ] dip move-forward
946 [ over - ] 2dip move-backward
949 : open-slice ( shift from seq -- )
953 [ ] [ nip length + ] [ 2nip ] 3tri
954 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
960 : delete-slice ( from to seq -- )
961 check-slice [ over [ - ] dip ] dip open-slice ;
963 : remove-nth! ( n seq -- seq )
964 [ [ dup 1 + ] dip delete-slice ] keep ;
966 : snip ( from to seq -- head tail )
967 [ swap head ] [ swap tail ] bi-curry bi* ; inline
969 : snip-slice ( from to seq -- head tail )
970 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
972 : replace-slice ( new from to seq -- seq' )
973 snip-slice surround ;
975 : remove-nth ( n seq -- seq' )
976 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
979 index-of-last over 0 >=
980 [ [ nth-unsafe ] [ shorten ] 2bi ]
981 [ bounds-error ] if ;
983 : exchange ( m n seq -- )
984 [ nip bounds-check 2drop ]
985 [ bounds-check 3drop ]
989 : midpoint@ ( seq -- n ) length 2/ ; inline
991 : reverse! ( seq -- seq )
993 [ midpoint@ ] [ length ] [ ] tri
994 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
998 : reverse ( seq -- newseq )
1000 dup [ length ] keep new-sequence
1001 [ 0 swap copy-unsafe ] keep reverse!
1004 GENERIC: sum-lengths ( seq -- n )
1006 M: object sum-lengths
1007 0 [ length + ] reduce ;
1009 M: repetition sum-lengths
1010 [ length>> ] [ elt>> length ] bi * ;
1012 : concat-as ( seq exemplar -- newseq )
1014 [ dup sum-lengths ] dip new-resizable
1015 [ [ push-all ] curry each ] keep
1016 ] keep like ; inline
1018 : concat ( seq -- newseq )
1019 [ { } ] [ dup first concat-as ] if-empty ;
1023 : joined-length ( seq glue -- n )
1024 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
1028 : join-as ( seq glue exemplar -- newseq )
1029 over empty? [ nip concat-as ] [
1031 2dup joined-length over new-resizable [
1032 [ [ push-all ] 2curry ]
1033 [ nip [ push-all ] curry ] 2bi
1039 : join ( seq glue -- newseq )
1040 dup join-as ; inline
1044 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
1046 [ over length [-] dup 0 = [ drop ] ] dip
1047 [ <repetition> ] curry
1048 ] dip compose if ; inline
1052 : pad-head ( seq n elt -- padded )
1053 [ swap dup append-as ] padding ;
1055 : pad-tail ( seq n elt -- padded )
1056 [ append ] padding ;
1058 : shorter? ( seq1 seq2 -- ? ) 2length < ; inline
1059 : longer? ( seq1 seq2 -- ? ) 2length > ; inline
1060 : shorter ( seq1 seq2 -- seq ) [ 2length <= ] most ; inline
1061 : longer ( seq1 seq2 -- seq ) [ 2length >= ] most ; inline
1063 : head? ( seq begin -- ? )
1067 [ length [ head-slice ] keep swap ] keep
1071 : tail? ( seq end -- ? )
1075 [ length [ tail-slice* ] keep swap ] keep
1079 : cut-slice ( seq n -- before-slice after-slice )
1080 [ head-slice ] [ tail-slice ] 2bi ; inline
1082 : cut-slice* ( seq n -- before-slice after-slice )
1083 [ head-slice* ] [ tail-slice* ] 2bi ;
1085 : insert-nth ( elt n seq -- seq' )
1086 swap cut-slice [ swap suffix ] dip append ;
1088 : halves ( seq -- first-slice second-slice )
1089 dup midpoint@ cut-slice ; inline
1093 : nth2-unsafe ( n seq -- a b )
1094 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
1096 : nth3-unsafe ( n seq -- a b c )
1097 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
1099 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
1100 ! We can't use case here since combinators depends on
1105 [ 2nip swap nth-unsafe ]
1106 [ -rot [ drop swap nth2-unsafe ] dip call ]
1107 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
1110 [ 2/ ] [ over - ] bi [ 2dup + ] dip
1111 [ (binary-reduce) ] [ 2curry ] curry 2bi@
1112 pick [ 3bi ] dip call
1113 ] if ; inline recursive
1117 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
1119 [ seq>> ] 3dip [ from>> 0 max ] [ to>> 0 max over - ] bi
1122 ] if (binary-reduce) ; inline
1124 : cut ( seq n -- before after )
1125 [ head ] [ tail ] 2bi ;
1127 : cut* ( seq n -- before after )
1128 [ head* ] [ tail* ] 2bi ;
1130 : subseq-starts-at? ( i seq subseq -- ? )
1131 [ length swap ] keep
1133 [ + _ nth-unsafe ] keep _ nth-unsafe =
1134 ] with all-integers? ; inline
1136 : subseq-index-from ( n seq subseq -- i/f )
1137 [ 2length - 1 + ] 2keep
1138 '[ _ _ subseq-starts-at? ] find-integer-from ; inline
1140 : subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
1142 : subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
1144 : subseq-start-from ( subseq seq n -- i/f )
1145 spin subseq-index-from ; inline deprecated
1147 : subseq-start ( subseq seq -- i/f ) swap subseq-index ; inline deprecated
1149 : subseq? ( subseq seq -- ? ) subseq-start >boolean ; inline deprecated
1151 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
1152 2dup mismatch [ 2dup min-length ] unless*
1153 [ tail-slice ] curry bi@ ;
1155 : unclip ( seq -- rest first )
1156 [ rest ] [ first-unsafe ] bi ;
1158 : unclip-last ( seq -- butlast last )
1159 [ but-last ] [ last-unsafe ] bi ;
1161 : unclip-slice ( seq -- rest-slice first )
1162 [ rest-slice ] [ first-unsafe ] bi ; inline
1164 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1165 [ [ [ first ] keep ] dip [ dip ] keep ] dip
1166 '[ swap _ dip swap @ ] 1 each-from ; inline
1168 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1169 [ [ [ [ first ] bi@ ] 2keep ] dip [ 2dip ] keep ] dip
1170 '[ rot _ dip swap @ ] 1 2each-from ; inline
1174 : (map-find) ( seq quot find-quot -- result elt )
1175 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1179 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1180 [ find ] (map-find) ; inline
1182 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1183 [ find-last ] (map-find) ; inline
1185 : unclip-last-slice ( seq -- butlast-slice last )
1186 [ but-last-slice ] [ last-unsafe ] bi ; inline
1190 : (trim-head) ( seq quot -- seq n )
1191 over [ negate find drop ] dip swap
1192 [ dup length ] unless* ; inline
1194 : (trim-tail) ( seq quot -- seq n )
1195 over [ negate find-last drop ?1+ ] dip
1200 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1201 (trim-head) tail-slice ; inline
1203 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1204 (trim-head) tail ; inline
1206 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1207 (trim-tail) head-slice ; inline
1209 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1210 (trim-tail) head ; inline
1212 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1213 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1215 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1216 [ trim-slice ] [ drop ] 2bi like ; inline
1218 GENERIC: sum ( seq -- n )
1219 M: object sum 0 [ + ] binary-reduce ; inline
1220 M: iota sum length dup 1 - * 2/ ; inline
1221 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1223 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1225 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1227 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1229 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1230 [ 0 ] 2dip [ dip + ] with-assoc each ; inline
1232 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1233 [ 1 0 ? ] compose map-sum ; inline
1235 : count-by ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1236 [ 1 0 ? ] compose map-sum ; inline
1238 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1239 [ with each ] 2curry each ; inline
1241 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1242 [ with { } map-as ] 2curry { } map-as ; inline
1244 : cartesian-product-as ( seq1 seq2 exemplar -- newseq )
1245 [ 2sequence ] curry cartesian-map ; inline
1247 : cartesian-product ( seq1 seq2 -- newseq )
1248 dup cartesian-product-as ; inline
1250 : cartesian-find ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... elt1 elt2 )
1251 [ f ] 3dip [ with find swap ] 2curry [ nip ] prepose find nip swap ; inline
1255 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1257 [ keep swap ] curry [ [ first ] dip call ] 2keep
1258 [ curry 2dip pick over ] curry
1260 [ [ 2drop ] [ 2nipd ] if ] compose
1261 ] bi* compose 1 each-from drop ; inline
1265 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1266 [ after? ] select-by ; inline
1268 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1269 [ before? ] select-by ; inline
1271 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1273 : longest ( seqs -- elt ) [ length ] supremum-by ;
1275 ! We hand-optimize flip to such a degree because type hints
1276 ! cannot express that an array is an array of arrays yet, and
1277 ! this word happens to be performance-critical since the compiler
1278 ! itself uses it. Optimizing it like this reduced compile time.
1281 : generic-flip ( matrix -- newmatrix )
1282 [ [ length ] [ min ] map-reduce ] keep
1283 '[ _ [ nth-unsafe ] with { } map-as ] map-integers ; inline
1287 : array-flip ( matrix -- newmatrix )
1289 [ [ { array } declare length>> ] [ min ] map-reduce ] keep
1290 '[ _ [ { array } declare array-nth ] with { } map-as ] map-integers ;
1294 : flip ( matrix -- newmatrix )
1298 [ array-flip ] [ generic-flip ] if
1299 ] [ generic-flip ] if