1 ! Copyright (C) 2005, 2011 Slava Pestov, Daniel Ehrenberg.
2 ! See http://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-like ( len exemplar quot -- seq )
19 over [ [ new-sequence ] dip call ] dip like ; inline
21 M: sequence like drop ; inline
23 GENERIC: lengthen ( n seq -- )
24 GENERIC: shorten ( n seq -- )
26 M: sequence lengthen 2dup length > [ set-length ] [ 2drop ] if ; inline
27 M: sequence shorten 2dup length < [ set-length ] [ 2drop ] if ; inline
29 : empty? ( seq -- ? ) length 0 = ; inline
31 : if-empty ( ..a seq quot1: ( ..a -- ..b ) quot2: ( ..a seq -- ..b ) -- ..b )
32 [ dup empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
34 : when-empty ( ... seq quot: ( ... -- ... obj ) -- ... seq/obj ) [ ] if-empty ; inline
35 : unless-empty ( ... seq quot: ( ... seq -- ... ) -- ... ) [ ] swap if-empty ; inline
37 : delete-all ( seq -- ) 0 swap set-length ;
39 : first ( seq -- first ) 0 swap nth ; inline
40 : second ( seq -- second ) 1 swap nth ; inline
41 : third ( seq -- third ) 2 swap nth ; inline
42 : fourth ( seq -- fourth ) 3 swap nth ; inline
44 : set-first ( first seq -- ) 0 swap set-nth ; inline
45 : set-second ( second seq -- ) 1 swap set-nth ; inline
46 : set-third ( third seq -- ) 2 swap set-nth ; inline
47 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
49 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
51 ERROR: bounds-error index seq ;
53 GENERIC#: bounds-check? 1 ( n seq -- ? )
55 M: integer bounds-check?
56 dupd length < [ 0 >= ] [ drop f ] if ; inline
58 : bounds-check ( n seq -- n seq )
59 2dup bounds-check? [ bounds-error ] unless ; inline
61 MIXIN: immutable-sequence
63 ERROR: immutable element index sequence ;
65 M: immutable-sequence set-nth immutable ;
67 INSTANCE: immutable-sequence sequence
71 : array-nth ( n array -- elt )
72 swap 2 fixnum+fast slot ; inline
74 : set-array-nth ( elt n array -- )
75 swap 2 fixnum+fast set-slot ; inline
77 : dispatch ( n array -- ) array-nth call ;
79 GENERIC: resize ( n seq -- newseq ) flushable
81 ! Unsafe sequence protocol for inner loops
82 GENERIC: nth-unsafe ( n seq -- elt ) flushable
83 GENERIC: set-nth-unsafe ( elt n seq -- )
85 M: sequence nth bounds-check nth-unsafe ; inline
86 M: sequence set-nth bounds-check set-nth-unsafe ; inline
88 M: sequence nth-unsafe nth ; inline
89 M: sequence set-nth-unsafe set-nth ; inline
91 : change-nth-unsafe ( i seq quot -- )
92 [ [ nth-unsafe ] dip call ] 2keepd set-nth-unsafe ; inline
96 ! The f object supports the sequence protocol trivially
97 M: f length drop 0 ; inline
98 M: f nth-unsafe nip ; inline
99 M: f like drop [ f ] when-empty ; inline
101 INSTANCE: f immutable-sequence
104 TUPLE: iota { n integer read-only } ;
106 ERROR: non-negative-integer-expected n ;
108 : <iota> ( n -- iota )
109 dup 0 < [ non-negative-integer-expected ] when
112 M: iota length n>> ; inline
113 M: iota nth-unsafe drop ; inline
115 INSTANCE: iota immutable-sequence
119 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
120 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
121 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
122 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
124 : first2-unsafe ( seq -- first second )
125 [ first-unsafe ] [ second-unsafe ] bi ; inline
127 : first3-unsafe ( seq -- first second third )
128 [ first2-unsafe ] [ third-unsafe ] bi ; inline
130 : first4-unsafe ( seq -- first second third fourth )
131 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
133 : exchange-unsafe ( m n seq -- )
134 [ [ nth-unsafe ] curry bi@ ]
135 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
137 : (1sequence) ( obj seq -- seq )
138 [ 0 swap set-nth-unsafe ] keep ; inline
140 : (2sequence) ( obj1 obj2 seq -- seq )
141 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
143 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
144 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
146 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
147 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
151 : head-to-index ( seq to -- zero to seq ) [ 0 ] 2dip swap ; inline
153 : index-to-tail ( seq from -- from length seq ) swap [ length ] keep ; inline
155 : from-tail ( seq n -- seq n' ) [ dup length ] dip - ; inline
157 : 1sequence ( obj exemplar -- seq )
158 1 swap [ (1sequence) ] new-like ; inline
160 : 2sequence ( obj1 obj2 exemplar -- seq )
161 2 swap [ (2sequence) ] new-like ; inline
163 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
164 3 swap [ (3sequence) ] new-like ; inline
166 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
167 4 swap [ (4sequence) ] new-like ; inline
169 : first2 ( seq -- first second )
170 1 swap bounds-check nip first2-unsafe ; inline
172 : first3 ( seq -- first second third )
173 2 swap bounds-check nip first3-unsafe ; inline
175 : first4 ( seq -- first second third fourth )
176 3 swap bounds-check nip first4-unsafe ; inline
178 : ?nth ( n seq -- elt/f )
179 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
181 : ?set-nth ( elt n seq -- )
182 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
184 : index-or-length ( seq n -- seq n' ) over length min ; inline
186 : index-of-last ( seq -- n seq ) [ length 1 - ] keep ; inline
188 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
189 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
190 : ?last ( seq -- elt/f )
191 index-of-last over 0 <
192 [ 2drop f ] [ nth-unsafe ] if ; inline
194 MIXIN: virtual-sequence
195 GENERIC: virtual-exemplar ( seq -- seq' )
196 GENERIC: virtual@ ( n seq -- n' seq' )
198 M: virtual-sequence nth virtual@ nth ; inline
199 M: virtual-sequence set-nth virtual@ set-nth ; inline
200 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
201 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
202 M: virtual-sequence like virtual-exemplar like ; inline
203 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
205 INSTANCE: virtual-sequence sequence
207 ! A reversal of an underlying sequence.
208 TUPLE: reversed { seq read-only } ;
210 C: <reversed> reversed
212 M: reversed virtual-exemplar seq>> ; inline
213 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
214 M: reversed length seq>> length ; inline
216 INSTANCE: reversed virtual-sequence
218 ! A slice of another sequence.
220 { from integer read-only }
221 { to integer read-only }
224 : >slice< ( slice -- from to seq )
225 [ from>> ] [ to>> ] [ seq>> ] tri ; inline
227 : collapse-slice ( m n slice -- m' n' seq )
228 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
230 ERROR: slice-error from to seq ;
232 : check-slice ( from to seq -- from to seq )
233 pick 0 < [ slice-error ] when
234 2dup length > [ slice-error ] when
235 2over > [ slice-error ] when ; inline
239 : <slice-unsafe> ( from to seq -- slice )
240 dup slice? [ collapse-slice ] when slice boa ; inline
244 : <slice> ( from to seq -- slice )
245 check-slice <slice-unsafe> ; inline
247 M: slice virtual-exemplar seq>> ; inline
249 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
251 M: slice length [ to>> ] [ from>> ] bi - ; inline
253 : head-slice ( seq n -- slice ) head-to-index <slice> ; inline
255 : tail-slice ( seq n -- slice ) index-to-tail <slice> ; inline
257 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
259 : head-slice* ( seq n -- slice ) from-tail head-slice ; inline
261 : tail-slice* ( seq n -- slice ) from-tail tail-slice ; inline
263 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
265 INSTANCE: slice virtual-sequence
267 ! One element repeated many times
269 { length integer read-only }
272 : <repetition> ( len elt -- repetition )
273 over 0 < [ non-negative-integer-expected ] when
274 repetition boa ; inline
276 M: repetition length length>> ; inline
277 M: repetition nth-unsafe nip elt>> ; inline
279 INSTANCE: repetition immutable-sequence
283 ERROR: integer-length-expected obj ;
285 ! The check-length call forces partial dispatch
286 : check-length ( n -- n )
287 dup integer? [ integer-length-expected ] unless ; inline
289 : >sequence< ( seq -- i n seq )
290 [ drop 0 ] [ length check-length ] [ ] tri ; inline
292 : length-sequence ( seq -- n seq )
293 [ length check-length ] [ ] bi ; inline
295 : >underlying< ( slice/seq -- i n slice/seq )
296 dup slice? [ >slice< ] [ >sequence< ] if ; inline
299 { src-i integer read-only }
301 { dst-i integer read-only }
306 : copy-nth-unsafe ( n copy -- )
307 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
308 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
310 : (copy) ( n copy -- dst )
311 over 0 <= [ nip dst>> ] [
312 [ 1 - ] dip [ copy-nth-unsafe ] [ (copy) ] 2bi
313 ] if ; inline recursive
315 : subseq>copy ( from to seq -- n copy )
316 [ over - check-length swap ] dip
317 3dup nip new-sequence 0 swap <copier> ; inline
319 : bounds-check-head ( n seq -- n seq )
320 over 0 < [ bounds-error ] when ; inline
322 : check-copy ( src n dst -- src n dst )
323 3dup bounds-check-head
324 [ swap length + ] dip lengthen ; inline
326 : copy-unsafe ( src i dst -- )
327 [ [ length check-length 0 ] keep ] 2dip <copier> (copy) drop ; inline
329 : subseq-unsafe-as ( from to seq exemplar -- subseq )
330 [ subseq>copy (copy) ] dip like ; inline
332 : subseq-unsafe ( from to seq -- subseq )
333 dup subseq-unsafe-as ; inline
337 : subseq-as ( from to seq exemplar -- subseq )
338 [ check-slice ] dip subseq-unsafe-as ;
340 : subseq ( from to seq -- subseq )
343 : head ( seq n -- headseq ) head-to-index subseq ;
345 : tail ( seq n -- tailseq ) index-to-tail subseq ;
347 : rest ( seq -- tailseq ) 1 tail ;
349 : head* ( seq n -- headseq ) from-tail head ;
351 : tail* ( seq n -- tailseq ) from-tail tail ;
353 : but-last ( seq -- headseq ) 1 head* ;
355 : copy ( src i dst -- ) check-copy copy-unsafe ; inline
357 M: sequence clone-like
358 [ dup length ] dip new-sequence [ 0 swap copy-unsafe ] keep ; inline
360 M: immutable-sequence clone-like like ; inline
362 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
366 : (append) ( seq1 seq2 accum -- accum )
367 [ [ over length ] dip copy-unsafe ]
368 [ 0 swap copy-unsafe ]
373 : append-as ( seq1 seq2 exemplar -- newseq )
374 [ 2dup [ length ] bi@ + ] dip
375 [ (append) ] new-like ; inline
377 : append ( seq1 seq2 -- newseq ) over append-as ;
379 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
381 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
383 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
384 [ 3dup [ length ] tri@ + + ] dip [
385 [ [ 2over [ length ] bi@ + ] dip copy-unsafe ]
389 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
391 : surround-as ( seq1 seq2 seq3 exemplar -- newseq )
392 [ swap ] 2dip 3append-as ; inline
394 : surround ( seq1 seq2 seq3 -- newseq ) over surround-as ; inline
396 : 1surround-as ( seq1 seq2 exemplar -- newseq ) dupd surround-as ; inline
398 : 1surround ( seq1 seq2 -- newseq ) dup 1surround-as ; inline
400 : glue-as ( seq1 seq2 seq3 exemplar -- newseq ) swapd 3append-as ; inline
402 : glue ( seq1 seq2 seq3 -- newseq ) pick glue-as ; inline
404 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
405 [ [ nth ] dip call ] 2keepd set-nth-unsafe ; inline
407 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
409 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
413 : sequence-operator ( seq quot -- i n quot' )
414 [ >underlying< [ nth-unsafe ] curry ] dip compose ; inline
416 : length-iterator ( seq -- n quot' )
417 length-sequence [ nth-unsafe ] curry ; inline
419 : length-operator ( seq quot -- n quot' )
420 [ length-iterator ] dip compose ; inline
422 : collect-into ( quot into -- quot' )
423 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
425 : collect-from ( i n quot into -- )
426 collect-into each-integer-from ; inline
428 : collect ( n quot into -- )
429 collect-into each-integer ; inline
431 : sequence-index-operator ( seq quot -- n quot' )
432 [ length-iterator [ keep ] curry ] dip compose ; inline
434 : map-into ( seq quot into -- )
435 [ length-operator ] dip collect ; inline
437 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
438 [ nth-unsafe ] bi-curry@ bi ; inline
440 : setup-2each ( seq1 seq2 -- n quot )
441 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
443 : (2each) ( seq1 seq2 quot -- n quot' )
444 [ setup-2each ] dip compose ; inline
446 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
447 [ nth-unsafe ] tri-curry@ tri ; inline
449 : setup-3each ( seq1 seq2 seq3 -- n quot )
450 [ [ length ] tri@ min min check-length ]
451 [ [ 3nth-unsafe ] 3curry ] 3bi ; inline
453 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
454 [ setup-3each ] dip compose ; inline
456 : element/index ( i/f seq -- elt/f i/f )
457 '[ [ _ nth ] [ f ] if* ] keep ;
459 : index/element ( i/f seq -- i/f elt/f )
460 dupd '[ _ nth ] [ f ] if* ;
462 : (accumulate) ( seq identity quot -- identity seq quot' )
463 swapd [ keepd ] curry ; inline
465 : (accumulate*) ( seq identity quot -- identity seq quot' )
466 swapd [ dup ] compose ; inline
470 : each ( ... seq quot: ( ... x -- ... ) -- ... )
471 sequence-operator each-integer-from ; inline
473 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
474 -rot length-operator each-integer-from ; inline
476 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
479 : map-integers-from-as ( ... from len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
480 overd [ [ collect-from ] keep ] new-like ; inline
482 : map-integers-as ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
483 overd [ [ collect ] keep ] new-like ; inline
485 : map-integers ( ... len quot: ( ... i -- ... elt ) -- ... newseq )
486 { } map-integers-as ; inline
488 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
489 [ length-operator ] dip map-integers-as ; inline
491 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
494 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
495 [ [ drop ] prepose ] dip map-integers-as ; inline
497 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
498 { } replicate-as ; inline
500 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
501 over [ map-into ] keep ; inline
503 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
504 [ (accumulate) ] dip map-as ; inline
506 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
507 pick accumulate-as ; inline
509 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
510 (accumulate) map! ; inline
512 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
513 [ (accumulate*) ] dip map-as nip ; inline
515 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
516 pick accumulate*-as ; inline
518 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
519 (accumulate*) map! nip ; inline
521 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
522 (2each) each-integer ; inline
524 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) i -- ... )
525 [ (2each) ] dip -rot each-integer-from ; inline
527 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
530 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
531 [ (2each) ] dip map-integers-as ; inline
533 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
534 pick 2map-as ; inline
536 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
537 (2each) all-integers? ; inline
539 : 2any? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
540 negate 2all? not ; inline
542 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
543 (3each) each-integer ; inline
545 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
546 [ (3each) ] dip map-integers-as ; inline
548 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
549 pickd swap 3map-as ; inline
553 : bounds-check-call ( n seq quot -- elt i )
554 2over bounds-check? [ call ] [ 3drop f f ] if ; inline
556 : find-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
557 [ length-operator find-integer-from ] keepd
558 index/element ; inline
560 : find-last-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
561 [ length-operator nip find-last-integer ] keepd
562 index/element ; inline
566 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
567 '[ _ find-from-unsafe ] bounds-check-call ; inline
569 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
570 [ 0 ] 2dip find-from-unsafe ; inline
572 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
573 '[ _ find-last-from-unsafe ] bounds-check-call ; inline
575 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
576 [ index-of-last ] dip find-last-from ; inline
578 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
580 _ [ sequence-index-operator find-integer-from ] keepd
582 ] bounds-check-call ; inline
584 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
585 [ 0 ] 2dip find-index-from ; inline
587 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
588 sequence-operator all-integers-from? ; inline
590 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
591 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
595 : (selector-as) ( quot length exemplar -- selector accum )
596 new-resizable [ [ push-if ] 2curry ] keep ; inline
600 : selector-as ( quot exemplar -- selector accum )
601 [ length ] keep (selector-as) ; inline
603 : selector ( quot -- selector accum )
604 V{ } selector-as ; inline
606 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
607 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
609 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
610 over filter-as ; inline
612 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
613 [ negate ] [ filter-as ] bi* ; inline
615 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
616 over reject-as ; inline
618 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
619 [ keep swap ] 2dip ? push ; inline
621 : 2selector ( quot -- selector accum1 accum2 )
622 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
624 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
625 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
627 : collector-for-as ( seq quot exemplar -- seq quot' vec )
628 [ over length ] dip new-resizable [ [ push ] curry compose ] keep ; inline
630 : collector-as ( quot exemplar -- quot' vec )
631 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
633 : collector-for ( seq quot -- seq quot' vec )
634 V{ } collector-for-as ; inline
636 : collector ( quot -- quot' vec )
637 V{ } collector-as ; inline
639 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
640 dup [ collector-as [ while ] dip ] curry dip like ; inline
642 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
643 { } produce-as ; inline
645 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
646 [ dup ] swap [ keep ] curry produce nip ; inline
648 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
649 sequence-index-operator each-integer ; inline
651 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
652 [ dup length <iota> ] 2dip 2map-as ; inline
654 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
655 over map-index-as ; inline
657 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
658 pick empty? [ 3drop ] [
659 [ [ drop first-unsafe ] dip call ]
660 [ [ bi* ] 2curry 1 each-from ]
664 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
665 swapd each-index ; inline
667 : index ( obj seq -- n )
668 [ = ] with find drop ;
670 : index-from ( obj i seq -- n )
671 rot [ = ] curry find-from drop ;
673 : last-index ( obj seq -- n )
674 [ = ] with find-last drop ;
676 : last-index-from ( obj i seq -- n )
677 rot [ = ] curry find-last-from drop ;
679 : indices ( obj seq -- indices )
680 swap [ = ] curry [ swap ] prepose V{ } clone [
681 [ push ] curry [ [ drop ] if ] curry compose each-index
686 : nths-unsafe ( indices seq -- seq' )
687 [ [ nth-unsafe ] curry ] keep map-as ;
691 : nths ( indices seq -- seq' )
692 [ [ nth ] curry ] keep map-as ;
694 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
695 find drop >boolean ; inline
697 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
700 : member? ( elt seq -- ? )
703 : member-eq? ( elt seq -- ? )
706 : remove ( elt seq -- newseq )
709 : remove-eq ( elt seq -- newseq )
710 [ eq? ] with reject ;
712 : sift ( seq -- newseq )
715 : harvest ( seq -- newseq )
720 : mismatch-unsafe ( n seq1 seq2 -- i )
721 [ 2nth-unsafe = not ] 2curry find-integer ; inline
725 : mismatch ( seq1 seq2 -- i )
726 [ min-length ] 2keep mismatch-unsafe ;
729 [ mismatch ] 2keep pick
730 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
732 : sequence= ( seq1 seq2 -- ? )
733 2dup [ length ] bi@ dupd =
734 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
736 ERROR: assert-sequence got expected ;
738 : assert-sequence= ( a b -- )
739 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
741 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
743 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
747 : sequence-hashcode-step ( oldhash newpart -- newhash )
748 integer>fixnum swap [
749 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
750 fixnum+fast fixnum+fast
751 ] keep fixnum-bitxor ; inline
755 : sequence-hashcode ( n seq -- x )
756 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
758 M: sequence hashcode* [ sequence-hashcode ] recursive-hashcode ;
761 over 0 <= [ 2drop 0 ] [
762 nip length 0 swap [ sequence-hashcode-step ] each-integer
765 M: reversed hashcode* [ sequence-hashcode ] recursive-hashcode ;
767 M: slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
769 : move ( to from seq -- )
771 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
775 : move-unsafe* ( to from seq -- from-nth )
778 [ [ nth-unsafe tuck swap ] [ set-nth-unsafe ] bi ] if ; inline
780 : filter-from! ( store from seq quot: ( ... elt -- ... ? ) -- seq )
782 [ [ move-unsafe* ] dip call ] 4keep
783 [ swap [ 1 + ] when ] 3dip
784 [ 1 + ] 2dip filter-from!
785 ] [ drop [ nip set-length ] keep ] if ; inline recursive
787 : move-unsafe ( to from seq -- )
789 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
793 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
794 [ 0 0 ] 2dip filter-from! ; inline
796 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
797 negate filter! ; inline
799 : remove! ( elt seq -- seq )
802 : remove-eq! ( elt seq -- seq )
803 [ eq? ] with reject! ;
805 : prefix ( seq elt -- newseq )
806 over [ over length 1 + ] dip [
807 (1sequence) [ 1 swap copy-unsafe ] keep
810 : suffix ( seq elt -- newseq )
811 over [ over length 1 + ] dip [
812 [ [ over length ] dip set-nth-unsafe ] keep
813 [ 0 swap copy-unsafe ] keep
816 : suffix! ( seq elt -- seq ) over push ; inline
818 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
820 : last ( seq -- elt )
822 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
826 : last-unsafe ( seq -- elt )
827 index-of-last nth-unsafe ; inline
831 : set-last ( elt seq -- )
833 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
835 : pop* ( seq -- ) index-of-last shorten ;
839 : move-backward ( shift from to seq -- )
843 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
847 : move-forward ( shift from to seq -- )
851 [ [ [ ] [ nip + ] [ 2nip ] 3tri ] dip move-unsafe 1 - ] keep
855 : (open-slice) ( shift from to seq ? -- )
857 [ [ 1 - ] bi@ ] dip move-forward
859 [ over - ] 2dip move-backward
862 : open-slice ( shift from seq -- )
866 [ ] [ nip length + ] [ 2nip ] 3tri
867 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
873 : delete-slice ( from to seq -- )
874 check-slice [ over [ - ] dip ] dip open-slice ;
876 : remove-nth! ( n seq -- seq )
877 [ [ dup 1 + ] dip delete-slice ] keep ;
879 : snip ( from to seq -- head tail )
880 [ swap head ] [ swap tail ] bi-curry bi* ; inline
882 : snip-slice ( from to seq -- head tail )
883 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
885 : replace-slice ( new from to seq -- seq' )
886 snip-slice surround ;
888 : remove-nth ( n seq -- seq' )
889 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
892 index-of-last over 0 >=
893 [ [ nth-unsafe ] [ shorten ] 2bi ]
894 [ bounds-error ] if ;
896 : exchange ( m n seq -- )
897 [ nip bounds-check 2drop ]
898 [ bounds-check 3drop ]
902 : midpoint@ ( seq -- n ) length 2/ ; inline
904 : reverse! ( seq -- seq )
906 [ midpoint@ ] [ length ] [ ] tri
907 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
911 : reverse ( seq -- newseq )
913 dup [ length ] keep new-sequence
914 [ 0 swap copy-unsafe ] keep reverse!
917 GENERIC: sum-lengths ( seq -- n )
919 M: object sum-lengths
920 0 [ length + ] reduce ;
922 M: repetition sum-lengths
923 [ length>> ] [ elt>> length ] bi * ;
925 : concat-as ( seq exemplar -- newseq )
927 [ dup sum-lengths ] dip new-resizable
928 [ [ push-all ] curry each ] keep
931 : concat ( seq -- newseq )
932 [ { } ] [ dup first concat-as ] if-empty ;
936 : joined-length ( seq glue -- n )
937 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
941 : join-as ( seq glue exemplar -- newseq )
942 over empty? [ nip concat-as ] [
944 2dup joined-length over new-resizable [
945 [ [ push-all ] 2curry ]
946 [ nip [ push-all ] curry ] 2bi
952 : join ( seq glue -- newseq )
957 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
959 [ over length [-] dup 0 = [ drop ] ] dip
960 [ <repetition> ] curry
961 ] dip compose if ; inline
965 : pad-head ( seq n elt -- padded )
966 [ swap dup append-as ] padding ;
968 : pad-tail ( seq n elt -- padded )
971 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ; inline
972 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ; inline
973 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
974 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
976 : head? ( seq begin -- ? )
980 [ length [ head-slice ] keep swap ] keep
984 : tail? ( seq end -- ? )
988 [ length [ tail-slice* ] keep swap ] keep
992 : cut-slice ( seq n -- before-slice after-slice )
993 [ head-slice ] [ tail-slice ] 2bi ; inline
995 : cut-slice* ( seq n -- before-slice after-slice )
996 [ head-slice* ] [ tail-slice* ] 2bi ;
998 : insert-nth ( elt n seq -- seq' )
999 swap cut-slice [ swap suffix ] dip append ;
1001 : halves ( seq -- first-slice second-slice )
1002 dup midpoint@ cut-slice ; inline
1006 : nth2-unsafe ( n seq -- a b )
1007 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
1009 : nth3-unsafe ( n seq -- a b c )
1010 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
1012 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
1013 ! We can't use case here since combinators depends on
1018 [ 2nip swap nth-unsafe ]
1019 [ -rot [ drop swap nth2-unsafe ] dip call ]
1020 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
1023 [ 2/ ] [ over - ] bi [ 2dup + ] dip
1024 [ (binary-reduce) ] [ 2curry ] curry 2bi@
1025 pick [ 3bi ] dip call
1026 ] if ; inline recursive
1030 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
1032 [ seq>> ] 3dip [ from>> 0 max ] [ to>> 0 max over - ] bi
1035 ] if (binary-reduce) ; inline
1037 : cut ( seq n -- before after )
1038 [ head ] [ tail ] 2bi ;
1040 : cut* ( seq n -- before after )
1041 [ head* ] [ tail* ] 2bi ;
1043 : subseq-starts-at? ( i seq subseq -- ? )
1044 [ length swap ] keep
1046 [ + _ nth-unsafe ] keep _ nth-unsafe =
1047 ] with all-integers? ; inline
1049 : subseq-index-from ( n seq subseq -- i/f )
1050 [ [ length ] bi@ - 1 + ] 2keep
1051 '[ _ _ subseq-starts-at? ] find-integer-from ; inline
1053 : subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
1055 : subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
1057 : subseq-start-from ( subseq seq n -- i/f )
1058 spin subseq-index-from ; inline deprecated
1060 : subseq-start ( subseq seq -- i/f ) swap subseq-index ; inline deprecated
1062 : subseq? ( subseq seq -- ? ) subseq-start >boolean ; inline deprecated
1064 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
1065 2dup mismatch [ 2dup min-length ] unless*
1066 [ tail-slice ] curry bi@ ;
1068 : unclip ( seq -- rest first )
1069 [ rest ] [ first-unsafe ] bi ;
1071 : unclip-last ( seq -- butlast last )
1072 [ but-last ] [ last-unsafe ] bi ;
1074 : unclip-slice ( seq -- rest-slice first )
1075 [ rest-slice ] [ first-unsafe ] bi ; inline
1077 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1078 [ [ [ first ] keep ] dip [ dip ] keep ] dip
1079 '[ swap _ dip swap @ ] 1 each-from ; inline
1081 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1082 [ [ [ [ first ] bi@ ] 2keep ] dip [ 2dip ] keep ] dip
1083 '[ rot _ dip swap @ ] 1 2each-from ; inline
1087 : (map-find) ( seq quot find-quot -- result elt )
1088 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1092 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1093 [ find ] (map-find) ; inline
1095 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1096 [ find-last ] (map-find) ; inline
1098 : unclip-last-slice ( seq -- butlast-slice last )
1099 [ but-last-slice ] [ last-unsafe ] bi ; inline
1103 : (trim-head) ( seq quot -- seq n )
1104 over [ negate find drop ] dip swap
1105 [ dup length ] unless* ; inline
1107 : (trim-tail) ( seq quot -- seq n )
1108 over [ negate find-last drop ?1+ ] dip
1113 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1114 (trim-head) tail-slice ; inline
1116 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1117 (trim-head) tail ; inline
1119 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1120 (trim-tail) head-slice ; inline
1122 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1123 (trim-tail) head ; inline
1125 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1126 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1128 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1129 [ trim-slice ] [ drop ] 2bi like ; inline
1131 GENERIC: sum ( seq -- n )
1132 M: object sum 0 [ + ] binary-reduce ; inline
1133 M: iota sum length dup 1 - * 2/ ; inline
1134 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1136 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1138 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1140 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1142 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1143 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1145 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1146 [ 1 0 ? ] compose map-sum ; inline
1148 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1149 [ with each ] 2curry each ; inline
1151 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1152 [ with { } map-as ] 2curry { } map-as ; inline
1154 : cartesian-product-as ( seq1 seq2 exemplar -- newseq )
1155 [ 2sequence ] curry cartesian-map ; inline
1157 : cartesian-product ( seq1 seq2 -- newseq )
1158 dup cartesian-product-as ; inline
1160 : cartesian-find ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... elt1 elt2 )
1161 [ f ] 3dip [ with find swap ] 2curry [ nip ] prepose find nip swap ; inline
1165 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1167 [ keep swap ] curry [ [ first ] dip call ] 2keep
1168 [ curry 2dip pick over ] curry
1170 [ [ 2drop ] [ 2nipd ] if ] compose
1171 ] bi* compose 1 each-from drop ; inline
1175 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1176 [ after? ] select-by ; inline
1178 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1179 [ before? ] select-by ; inline
1181 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1183 : longest ( seqs -- elt ) [ length ] supremum-by ;
1185 ! We hand-optimize flip to such a degree because type hints
1186 ! cannot express that an array is an array of arrays yet, and
1187 ! this word happens to be performance-critical since the compiler
1188 ! itself uses it. Optimizing it like this reduced compile time.
1191 : generic-flip ( matrix -- newmatrix )
1192 [ [ length ] [ min ] map-reduce ] keep
1193 '[ _ [ nth-unsafe ] with { } map-as ] map-integers ; inline
1197 : array-flip ( matrix -- newmatrix )
1199 [ [ { array } declare length>> ] [ min ] map-reduce ] keep
1200 '[ _ [ { array } declare array-nth ] with { } map-as ] map-integers ;
1204 : flip ( matrix -- newmatrix )
1208 [ array-flip ] [ generic-flip ] if
1209 ] [ generic-flip ] if