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 -- ) [ ] if-empty ; inline
36 : unless-empty ( seq quot -- ) [ ] swap if-empty ; inline
38 : delete-all ( seq -- ) 0 swap set-length ;
40 : first ( seq -- first ) 0 swap nth ; inline
41 : second ( seq -- second ) 1 swap nth ; inline
42 : third ( seq -- third ) 2 swap nth ; inline
43 : fourth ( seq -- fourth ) 3 swap nth ; inline
45 : set-first ( first seq -- ) 0 swap set-nth ; inline
46 : set-second ( second seq -- ) 1 swap set-nth ; inline
47 : set-third ( third seq -- ) 2 swap set-nth ; inline
48 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
50 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
52 ERROR: bounds-error index seq ;
54 GENERIC# bounds-check? 1 ( n seq -- ? )
56 M: integer bounds-check? ( n seq -- ? )
57 dupd length < [ 0 >= ] [ drop f ] if ; inline
59 : bounds-check ( n seq -- n seq )
60 2dup bounds-check? [ throw-bounds-error ] unless ; inline
62 MIXIN: immutable-sequence
64 ERROR: immutable element index sequence ;
66 M: immutable-sequence set-nth throw-immutable ;
68 INSTANCE: immutable-sequence sequence
72 : array-nth ( n array -- elt )
73 swap 2 fixnum+fast slot ; inline
75 : set-array-nth ( elt n array -- )
76 swap 2 fixnum+fast set-slot ; inline
78 : dispatch ( n array -- ) array-nth call ;
80 GENERIC: resize ( n seq -- newseq ) flushable
82 ! Unsafe sequence protocol for inner loops
83 GENERIC: nth-unsafe ( n seq -- elt ) flushable
84 GENERIC: set-nth-unsafe ( elt n seq -- )
86 M: sequence nth bounds-check nth-unsafe ; inline
87 M: sequence set-nth bounds-check set-nth-unsafe ; inline
89 M: sequence nth-unsafe nth ; inline
90 M: sequence set-nth-unsafe set-nth ; inline
92 : change-nth-unsafe ( i seq quot -- )
93 [ [ nth-unsafe ] dip call ] 3keep drop set-nth-unsafe ; inline
97 ! The f object supports the sequence protocol trivially
98 M: f length drop 0 ; inline
99 M: f nth-unsafe nip ; inline
100 M: f like drop [ f ] when-empty ; inline
102 INSTANCE: f immutable-sequence
105 TUPLE: iota-tuple { n integer read-only } ;
107 ERROR: non-negative-integer-expected n ;
110 dup 0 < [ non-negative-integer-expected ] when
111 iota-tuple boa ; inline
113 M: iota-tuple length n>> ; inline
114 M: iota-tuple nth-unsafe drop ; inline
116 INSTANCE: iota-tuple immutable-sequence
120 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
121 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
122 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
123 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
125 : first2-unsafe ( seq -- first second )
126 [ first-unsafe ] [ second-unsafe ] bi ; inline
128 : first3-unsafe ( seq -- first second third )
129 [ first2-unsafe ] [ third-unsafe ] bi ; inline
131 : first4-unsafe ( seq -- first second third fourth )
132 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
134 : exchange-unsafe ( m n seq -- )
135 [ [ nth-unsafe ] curry bi@ ]
136 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
138 : (head) ( seq n -- from to seq ) [ 0 ] 2dip swap ; inline
140 : (tail) ( seq n -- from to seq ) swap [ length ] keep ; inline
142 : from-end ( seq n -- seq n' ) [ dup length ] dip - ; inline
144 : (1sequence) ( obj seq -- seq )
145 [ 0 swap set-nth-unsafe ] keep ; inline
147 : (2sequence) ( obj1 obj2 seq -- seq )
148 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
150 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
151 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
153 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
154 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
158 : 1sequence ( obj exemplar -- seq )
159 1 swap [ (1sequence) ] new-like ; inline
161 : 2sequence ( obj1 obj2 exemplar -- seq )
162 2 swap [ (2sequence) ] new-like ; inline
164 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
165 3 swap [ (3sequence) ] new-like ; inline
167 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
168 4 swap [ (4sequence) ] new-like ; inline
170 : first2 ( seq -- first second )
171 1 swap bounds-check nip first2-unsafe ; inline
173 : first3 ( seq -- first second third )
174 2 swap bounds-check nip first3-unsafe ; inline
176 : first4 ( seq -- first second third fourth )
177 3 swap bounds-check nip first4-unsafe ; inline
179 : ?nth ( n seq -- elt/f )
180 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
182 : ?set-nth ( elt n seq -- )
183 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
185 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
186 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
187 : ?last ( seq -- elt/f )
188 [ length 1 - ] keep over 0 <
189 [ 2drop f ] [ nth-unsafe ] if ; inline
191 MIXIN: virtual-sequence
192 GENERIC: virtual-exemplar ( seq -- seq' )
193 GENERIC: virtual@ ( n seq -- n' seq' )
195 M: virtual-sequence nth virtual@ nth ; inline
196 M: virtual-sequence set-nth virtual@ set-nth ; inline
197 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
198 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
199 M: virtual-sequence like virtual-exemplar like ; inline
200 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
202 INSTANCE: virtual-sequence sequence
204 ! A reversal of an underlying sequence.
205 TUPLE: reversed { seq read-only } ;
207 C: <reversed> reversed
209 M: reversed virtual-exemplar seq>> ; inline
210 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
211 M: reversed length seq>> length ; inline
213 INSTANCE: reversed virtual-sequence
215 ! A slice of another sequence.
217 { from integer read-only }
218 { to integer read-only }
221 : collapse-slice ( m n slice -- m' n' seq )
222 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
224 ERROR: slice-error from to seq ;
226 : check-slice ( from to seq -- from to seq )
227 pick 0 < [ slice-error ] when
228 2dup length > [ slice-error ] when
229 2over > [ slice-error ] when ; inline
233 : <slice-unsafe> ( from to seq -- slice )
234 dup slice? [ collapse-slice ] when slice boa ; inline
238 : <slice> ( from to seq -- slice )
239 check-slice <slice-unsafe> ; inline
241 M: slice virtual-exemplar seq>> ; inline
243 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
245 M: slice length [ to>> ] [ from>> ] bi - ; inline
247 : short ( seq n -- seq n' ) over length min ; inline
249 : head-slice ( seq n -- slice ) (head) <slice> ; inline
251 : tail-slice ( seq n -- slice ) (tail) <slice> ; inline
253 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
255 : head-slice* ( seq n -- slice ) from-end head-slice ; inline
257 : tail-slice* ( seq n -- slice ) from-end tail-slice ; inline
259 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
261 INSTANCE: slice virtual-sequence
263 ! One element repeated many times
265 { length integer read-only }
268 : <repetition> ( len elt -- repetition )
269 over 0 < [ non-negative-integer-expected ] when
270 repetition boa ; inline
272 M: repetition length length>> ; inline
273 M: repetition nth-unsafe nip elt>> ; inline
275 INSTANCE: repetition immutable-sequence
279 ERROR: integer-length-expected obj ;
281 #! The check-length call forces partial dispatch
282 : check-length ( n -- n )
283 dup integer? [ integer-length-expected ] unless ; inline
293 : ((copy)) ( n copy -- )
294 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
295 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
297 : (copy) ( n copy -- dst )
298 over 0 <= [ nip dst>> ] [
299 [ 1 - ] dip [ ((copy)) ] [ (copy) ] 2bi
300 ] if ; inline recursive
302 : subseq>copy ( from to seq -- n copy )
303 [ over - check-length swap ] dip
304 3dup nip new-sequence 0 swap <copy> ; inline
306 : bounds-check-head ( n seq -- n seq )
307 over 0 < [ throw-bounds-error ] when ; inline
309 : check-copy ( src n dst -- src n dst )
310 3dup bounds-check-head
311 [ swap length + ] dip lengthen ; inline
313 : copy-unsafe ( src i dst -- )
314 [ [ length check-length 0 ] keep ] 2dip <copy> (copy) drop ; inline
316 : subseq-unsafe ( from to seq -- subseq )
317 [ subseq>copy (copy) ] keep like ;
321 : subseq ( from to seq -- subseq )
322 [ check-slice subseq>copy (copy) ] keep like ;
324 : head ( seq n -- headseq ) (head) subseq ;
326 : tail ( seq n -- tailseq ) (tail) subseq ;
328 : rest ( seq -- tailseq ) 1 tail ;
330 : head* ( seq n -- headseq ) from-end head ;
332 : tail* ( seq n -- tailseq ) from-end tail ;
334 : but-last ( seq -- headseq ) 1 head* ;
336 : copy ( src i dst -- ) check-copy copy-unsafe ; inline
338 M: sequence clone-like
339 [ dup length ] dip new-sequence [ 0 swap copy-unsafe ] keep ; inline
341 M: immutable-sequence clone-like like ; inline
343 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
347 : (append) ( seq1 seq2 accum -- accum )
348 [ [ over length ] dip copy-unsafe ]
349 [ 0 swap copy-unsafe ]
354 : append-as ( seq1 seq2 exemplar -- newseq )
355 [ 2dup [ length ] bi@ + ] dip
356 [ (append) ] new-like ; inline
358 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
359 [ 3dup [ length ] tri@ + + ] dip [
360 [ [ 2over [ length ] bi@ + ] dip copy-unsafe ]
364 : append ( seq1 seq2 -- newseq ) over append-as ;
366 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
368 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
370 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
372 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
374 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
376 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
377 [ [ nth ] dip call ] 3keep drop set-nth-unsafe ; inline
379 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
381 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
385 : ((each)) ( seq -- n quot )
386 [ length check-length ] keep [ nth-unsafe ] curry ; inline
388 : (each) ( seq quot -- n quot' )
389 [ ((each)) ] dip compose ; inline
391 : (each-index) ( seq quot -- n quot' )
392 [ ((each)) [ keep ] curry ] dip compose ; inline
394 : (collect) ( quot into -- quot' )
395 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
397 : collect ( n quot into -- )
398 (collect) each-integer ; inline
400 : map-into ( seq quot into -- )
401 [ (each) ] dip collect ; inline
403 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
404 [ nth-unsafe ] bi-curry@ bi ; inline
406 : ((2each)) ( seq1 seq2 -- n quot )
407 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
409 : (2each) ( seq1 seq2 quot -- n quot' )
410 [ ((2each)) ] dip compose ; inline
412 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
413 [ nth-unsafe ] tri-curry@ tri ; inline
415 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
417 [ [ length ] tri@ min min check-length ]
418 [ [ 3nth-unsafe ] 3curry ] 3bi
419 ] dip compose ; inline
421 : finish-find ( i seq -- i elt )
422 over [ dupd nth-unsafe ] [ drop f ] if ; inline
424 : (find) ( seq quot quot' -- i elt )
425 pick [ [ (each) ] dip call ] dip finish-find ; inline
427 : (find-from) ( n seq quot quot' -- i elt )
428 [ 2dup bounds-check? ] 2dip
433 : (find-index) ( seq quot quot' -- i elt )
434 pick [ [ (each-index) ] dip call ] dip finish-find ; inline
436 : (find-index-from) ( n seq quot quot' -- i elt )
437 [ 2dup bounds-check? ] 2dip
438 [ (find-index) ] 2curry
442 : (accumulate) ( seq identity quot -- identity seq quot )
443 swapd [ curry keep ] curry ; inline
447 : each ( ... seq quot: ( ... x -- ... ) -- ... )
448 (each) each-integer ; inline
450 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
451 -rot (each) (each-integer) ; inline
453 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
456 : map-integers ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
457 [ over ] dip [ [ collect ] keep ] new-like ; inline
459 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
460 [ (each) ] dip map-integers ; inline
462 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
465 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
466 [ [ drop ] prepose ] dip map-integers ; inline
468 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
469 { } replicate-as ; inline
471 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
472 over [ map-into ] keep ; inline
474 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
475 [ (accumulate) ] dip map-as ; inline
477 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
478 pick accumulate-as ; inline
480 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
481 (accumulate) map! ; inline
483 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
484 (2each) each-integer ; inline
486 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) i -- ... )
487 [ (2each) ] dip -rot (each-integer) ; inline
489 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
490 [ -rot ] dip 2each ; inline
492 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
493 [ (2each) ] dip map-integers ; inline
495 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
496 pick 2map-as ; inline
498 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
499 (2each) all-integers? ; inline
501 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
502 (3each) each-integer ; inline
504 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
505 [ (3each) ] dip map-integers ; inline
507 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
508 [ pick ] dip swap 3map-as ; inline
510 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
511 [ (find-integer) ] (find-from) ; inline
513 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
514 [ find-integer ] (find) ; inline
516 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
517 [ nip find-last-integer ] (find-from) ; inline
519 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
520 [ [ 1 - ] dip find-last-integer ] (find) ; inline
522 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
523 [ (find-integer) ] (find-index-from) ; inline
525 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
526 [ find-integer ] (find-index) ; inline
528 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
529 (each) all-integers? ; inline
531 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
532 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
536 : (selector-for) ( quot length exemplar -- selector accum )
537 new-resizable [ [ push-if ] 2curry ] keep ; inline
541 : selector-for ( quot exemplar -- selector accum )
542 [ length ] keep (selector-for) ; inline
544 : selector ( quot -- selector accum )
545 V{ } selector-for ; inline
547 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
548 pick length over [ (selector-for) [ each ] dip ] 2curry dip like ; inline
550 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
551 over filter-as ; inline
553 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
554 [ [ not ] compose ] [ filter-as ] bi* ; inline
556 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
557 over reject-as ; inline
559 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
560 [ keep swap ] 2dip ? push ; inline
562 : 2selector ( quot -- selector accum1 accum2 )
563 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
565 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
566 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
568 : collector-for ( quot exemplar -- quot' vec )
569 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
571 : collector ( quot -- quot' vec )
572 V{ } collector-for ; inline
574 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
575 dup [ collector-for [ while ] dip ] curry dip like ; inline
577 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
578 { } produce-as ; inline
580 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
581 [ dup ] swap [ keep ] curry produce nip ; inline
583 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
584 (each-index) each-integer ; inline
586 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
587 [ dup length iota ] 2dip 2map-as ; inline
589 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
590 { } map-index-as ; inline
592 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
593 pick empty? [ 3drop ] [
594 [ [ drop first-unsafe ] dip call ]
595 [ [ bi* ] 2curry 1 each-from ]
599 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
600 swapd each-index ; inline
602 : index ( obj seq -- n )
603 [ = ] with find drop ;
605 : index-from ( obj i seq -- n )
606 rot [ = ] curry find-from drop ;
608 : last-index ( obj seq -- n )
609 [ = ] with find-last drop ;
611 : last-index-from ( obj i seq -- n )
612 rot [ = ] curry find-last-from drop ;
616 : (indices) ( elt i obj accum -- )
617 [ swap [ = ] dip ] dip [ push ] 2curry when ; inline
621 : indices ( obj seq -- indices )
623 [ [ (indices) ] 2curry each-index ] keep ;
627 : nths-unsafe ( indices seq -- seq' )
628 [ [ nth-unsafe ] curry ] keep map-as ;
632 : nths ( indices seq -- seq' )
633 [ [ nth ] curry ] keep map-as ;
635 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
636 find drop >boolean ; inline
638 : member? ( elt seq -- ? )
641 : member-eq? ( elt seq -- ? )
644 : remove ( elt seq -- newseq )
647 : remove-eq ( elt seq -- newseq )
648 [ eq? ] with reject ;
650 : sift ( seq -- newseq )
653 : harvest ( seq -- newseq )
658 : mismatch-unsafe ( n seq1 seq2 -- i )
659 [ 2nth-unsafe = not ] 2curry find-integer ; inline
663 : mismatch ( seq1 seq2 -- i )
664 [ min-length ] 2keep mismatch-unsafe ; inline
667 [ mismatch ] 2keep pick
668 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
670 : sequence= ( seq1 seq2 -- ? )
671 2dup [ length ] bi@ dupd =
672 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
674 ERROR: assert-sequence got expected ;
676 : assert-sequence= ( a b -- )
677 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
681 : sequence-hashcode-step ( oldhash newpart -- newhash )
682 integer>fixnum swap [
683 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
684 fixnum+fast fixnum+fast
685 ] keep fixnum-bitxor ; inline
689 : sequence-hashcode ( n seq -- x )
690 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
692 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
694 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
696 : move ( to from seq -- )
698 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
702 : move-unsafe ( to from seq -- )
704 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
706 : (filter!) ( ... quot: ( ... elt -- ... ? ) store scan seq -- ... )
708 [ move-unsafe ] 3keep
709 [ nth-unsafe pick call [ 1 + ] when ] 2keep
712 ] [ nip set-length drop ] if ; inline recursive
716 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
717 swap [ [ 0 0 ] dip (filter!) ] keep ; inline
719 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
720 [ not ] compose filter! ; inline
722 : remove! ( elt seq -- seq )
725 : remove-eq! ( elt seq -- seq )
726 [ eq? ] with reject! ;
728 : prefix ( seq elt -- newseq )
729 over [ over length 1 + ] dip [
730 (1sequence) [ 1 swap copy-unsafe ] keep
733 : suffix ( seq elt -- newseq )
734 over [ over length 1 + ] dip [
735 [ [ over length ] dip set-nth-unsafe ] keep
736 [ 0 swap copy-unsafe ] keep
739 : suffix! ( seq elt -- seq ) over push ; inline
741 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
743 : last ( seq -- elt )
745 over 0 < [ throw-bounds-error ] [ nth-unsafe ] if ; inline
749 : last-unsafe ( seq -- elt )
750 [ length 1 - ] [ nth-unsafe ] bi ; inline
754 : set-last ( elt seq -- )
756 over 0 < [ throw-bounds-error ] [ set-nth-unsafe ] if ; inline
758 : pop* ( seq -- ) [ length 1 - ] [ shorten ] bi ;
762 : move-backward ( shift from to seq -- )
766 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
770 : move-forward ( shift from to seq -- )
774 [ [ pick [ dup dup ] dip + swap ] dip move-unsafe 1 - ] keep
778 : (open-slice) ( shift from to seq ? -- )
780 [ [ 1 - ] bi@ ] dip move-forward
782 [ over - ] 2dip move-backward
785 : open-slice ( shift from seq -- )
789 pick over length + over
790 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
796 : delete-slice ( from to seq -- )
797 check-slice [ over [ - ] dip ] dip open-slice ;
799 : remove-nth! ( n seq -- seq )
800 [ [ dup 1 + ] dip delete-slice ] keep ;
802 : snip ( from to seq -- head tail )
803 [ swap head ] [ swap tail ] bi-curry bi* ; inline
805 : snip-slice ( from to seq -- head tail )
806 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
808 : replace-slice ( new from to seq -- seq' )
809 snip-slice surround ;
811 : remove-nth ( n seq -- seq' )
812 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
815 [ length 1 - ] keep over 0 >=
816 [ [ nth-unsafe ] [ shorten ] 2bi ]
817 [ throw-bounds-error ] if ;
819 : exchange ( m n seq -- )
820 [ nip bounds-check 2drop ]
821 [ bounds-check 3drop ]
825 : midpoint@ ( seq -- n ) length 2/ ; inline
827 : reverse! ( seq -- seq )
829 [ midpoint@ ] [ length ] [ ] tri
830 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
834 : reverse ( seq -- newseq )
836 dup [ length ] keep new-sequence
837 [ 0 swap copy-unsafe ] keep reverse!
840 GENERIC: sum-lengths ( seq -- n )
842 M: object sum-lengths
843 0 [ length + ] reduce ;
845 M: repetition sum-lengths
846 [ length>> ] [ elt>> length ] bi * ;
848 : concat-as ( seq exemplar -- newseq )
850 [ dup sum-lengths ] dip new-resizable
851 [ [ push-all ] curry each ] keep
854 : concat ( seq -- newseq )
855 [ { } ] [ dup first concat-as ] if-empty ;
859 : joined-length ( seq glue -- n )
860 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
864 : join-as ( seq glue exemplar -- newseq )
865 over empty? [ nip concat-as ] [
867 2dup joined-length over new-resizable [
868 [ [ push-all ] 2curry ]
869 [ nip [ push-all ] curry ] 2bi
875 : join ( seq glue -- newseq )
878 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
880 [ over length [-] dup 0 = [ drop ] ] dip
881 [ <repetition> ] curry
882 ] dip compose if ; inline
884 : pad-head ( seq n elt -- padded )
885 [ swap dup append-as ] padding ;
887 : pad-tail ( seq n elt -- padded )
890 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ; inline
891 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ; inline
892 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
893 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
895 : head? ( seq begin -- ? )
899 [ length [ head-slice ] keep swap ] keep
903 : tail? ( seq end -- ? )
907 [ length [ tail-slice* ] keep swap ] keep
911 : cut-slice ( seq n -- before-slice after-slice )
912 [ head-slice ] [ tail-slice ] 2bi ; inline
914 : insert-nth ( elt n seq -- seq' )
915 swap cut-slice [ swap suffix ] dip append ;
917 : halves ( seq -- first-slice second-slice )
918 dup midpoint@ cut-slice ; inline
922 : nth2-unsafe ( n seq -- a b )
923 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
925 : nth3-unsafe ( n seq -- a b c )
926 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
928 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
929 #! We can't use case here since combinators depends on
934 [ 2nip swap nth-unsafe ]
935 [ -rot [ drop swap nth2-unsafe ] dip call ]
936 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
939 [ 2/ ] [ over - ] bi [ 2dup + ] dip
940 [ (binary-reduce) ] [ 2curry ] curry 2bi@
941 pick [ 3bi ] dip call
942 ] if ; inline recursive
946 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
947 pick length 0 max 0 swap (binary-reduce) ; inline
949 : cut ( seq n -- before after )
950 [ head ] [ tail ] 2bi ;
952 : cut* ( seq n -- before after )
953 [ head* ] [ tail* ] 2bi ;
957 : (start) ( subseq seq n length -- subseq seq ? )
959 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
960 ] all-integers? nip ; inline
964 : start* ( subseq seq n -- i )
965 pick length [ pick length swap - 1 + ] keep
966 [ (start) ] curry (find-integer) 2nip ;
968 : start ( subseq seq -- i ) 0 start* ; inline
970 : subseq? ( subseq seq -- ? ) start >boolean ;
972 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
973 2dup mismatch [ 2dup min-length ] unless*
974 [ tail-slice ] curry bi@ ;
976 : unclip ( seq -- rest first )
977 [ rest ] [ first-unsafe ] bi ;
979 : unclip-last ( seq -- butlast last )
980 [ but-last ] [ last-unsafe ] bi ;
982 : unclip-slice ( seq -- rest-slice first )
983 [ rest-slice ] [ first-unsafe ] bi ; inline
985 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
986 [ [ dup first ] dip [ call ] keep ] dip compose
987 swapd 1 each-from ; inline
989 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
990 [ [ 2dup [ first ] bi@ ] dip [ call ] keep ] dip compose
991 [ -rot ] dip 1 2each-from ; inline
995 : (map-find) ( seq quot find-quot -- result elt )
996 [ [ f ] 2dip [ [ nip ] dip call dup ] curry ] dip call
997 [ [ drop f ] unless ] dip ; inline
1001 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1002 [ find ] (map-find) ; inline
1004 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1005 [ find-last ] (map-find) ; inline
1007 : unclip-last-slice ( seq -- butlast-slice last )
1008 [ but-last-slice ] [ last-unsafe ] bi ; inline
1012 : (trim-head) ( seq quot -- seq n )
1013 over [ [ not ] compose find drop ] dip swap
1014 [ dup length ] unless* ; inline
1016 : (trim-tail) ( seq quot -- seq n )
1017 over [ [ not ] compose find-last drop ?1+ ] dip
1022 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1023 (trim-head) tail-slice ; inline
1025 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1026 (trim-head) tail ; inline
1028 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1029 (trim-tail) head-slice ; inline
1031 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1032 (trim-tail) head ; inline
1034 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1035 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1037 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1038 [ trim-slice ] [ drop ] 2bi like ; inline
1040 GENERIC: sum ( seq -- n )
1041 M: object sum 0 [ + ] binary-reduce ; inline
1042 M: iota-tuple sum length dup 1 - * 2/ ; inline
1043 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1045 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1047 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1049 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1051 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1052 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1054 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1055 [ 1 0 ? ] compose map-sum ; inline
1057 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1058 [ with each ] 2curry each ; inline
1060 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1061 [ with map ] 2curry map ; inline
1063 : cartesian-product ( seq1 seq2 -- newseq )
1064 [ { } 2sequence ] cartesian-map ;
1068 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1070 [ keep swap ] curry [ [ first ] dip call ] 2keep
1071 [ curry 2dip pick over ] curry
1073 [ [ 2drop ] [ [ 2drop ] 2dip ] if ] compose
1074 ] bi* compose 1 each-from drop ; inline
1078 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1079 [ after? ] select-by ; inline
1081 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1082 [ before? ] select-by ; inline
1084 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1086 : longest ( seqs -- elt ) [ length ] supremum-by ;
1088 ! We hand-optimize flip to such a degree because type hints
1089 ! cannot express that an array is an array of arrays yet, and
1090 ! this word happens to be performance-critical since the compiler
1091 ! itself uses it. Optimizing it like this reduced compile time.
1094 : generic-flip ( matrix -- newmatrix )
1096 [ first-unsafe length 1 ] keep
1097 [ length min ] (each) (each-integer) iota
1099 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
1103 : array-length ( array -- len )
1104 { array } declare length>> ; inline
1106 : array-flip ( matrix -- newmatrix )
1109 [ first-unsafe array-length 1 ] keep
1110 [ array-length min ] (each) (each-integer) iota
1112 [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
1116 : flip ( matrix -- newmatrix )
1120 [ array-flip ] [ generic-flip ] if
1121 ] [ generic-flip ] if