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? [ bounds-error ] unless ; inline
62 MIXIN: immutable-sequence
64 ERROR: immutable element index sequence ;
66 M: immutable-sequence set-nth 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 { n integer read-only } ;
107 ERROR: non-negative-integer-expected n ;
109 : <iota> ( n -- iota )
110 dup 0 < [ non-negative-integer-expected ] when
113 M: iota length n>> ; inline
114 M: iota nth-unsafe drop ; inline
116 INSTANCE: iota 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-nth-unsafe ( 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-nth-unsafe ] [ (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 < [ 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-as ( from to seq exemplar -- subseq )
317 [ subseq>copy (copy) ] dip like ;
319 : subseq-unsafe ( from to seq -- subseq )
320 dup subseq-unsafe-as ; inline
324 : subseq-as ( from to seq exemplar -- subseq )
325 [ check-slice ] dip subseq-unsafe-as ;
327 : subseq ( from to seq -- subseq )
328 dup subseq-as ; inline
330 : head ( seq n -- headseq ) (head) subseq ;
332 : tail ( seq n -- tailseq ) (tail) subseq ;
334 : rest ( seq -- tailseq ) 1 tail ;
336 : head* ( seq n -- headseq ) from-end head ;
338 : tail* ( seq n -- tailseq ) from-end tail ;
340 : but-last ( seq -- headseq ) 1 head* ;
342 : copy ( src i dst -- ) check-copy copy-unsafe ; inline
344 M: sequence clone-like
345 [ dup length ] dip new-sequence [ 0 swap copy-unsafe ] keep ; inline
347 M: immutable-sequence clone-like like ; inline
349 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
353 : (append) ( seq1 seq2 accum -- accum )
354 [ [ over length ] dip copy-unsafe ]
355 [ 0 swap copy-unsafe ]
360 : append-as ( seq1 seq2 exemplar -- newseq )
361 [ 2dup [ length ] bi@ + ] dip
362 [ (append) ] new-like ; inline
364 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
365 [ 3dup [ length ] tri@ + + ] dip [
366 [ [ 2over [ length ] bi@ + ] dip copy-unsafe ]
370 : append ( seq1 seq2 -- newseq ) over append-as ;
372 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
374 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
376 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
378 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
380 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
382 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
383 [ [ nth ] dip call ] 3keep drop set-nth-unsafe ; inline
385 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
387 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
391 : (setup-each) ( seq -- n quot )
392 [ length check-length ] keep [ nth-unsafe ] curry ; inline
394 : setup-each ( seq quot -- n quot' )
395 [ (setup-each) ] dip compose ; inline
397 : (each-index) ( seq quot -- n quot' )
398 [ (setup-each) [ keep ] curry ] dip compose ; inline
400 : (collect) ( quot into -- quot' )
401 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
403 : collect ( n quot into -- )
404 (collect) each-integer ; inline
406 : map-into ( seq quot into -- )
407 [ setup-each ] dip collect ; inline
409 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
410 [ nth-unsafe ] bi-curry@ bi ; inline
412 : setup-2each ( seq1 seq2 -- n quot )
413 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
415 : (2each) ( seq1 seq2 quot -- n quot' )
416 [ setup-2each ] dip compose ; inline
418 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
419 [ nth-unsafe ] tri-curry@ tri ; inline
421 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
423 [ [ length ] tri@ min min check-length ]
424 [ [ 3nth-unsafe ] 3curry ] 3bi
425 ] dip compose ; inline
427 : finish-find ( i seq -- i elt )
428 over [ dupd nth-unsafe ] [ drop f ] if ; inline
430 : (find) ( seq quot quot' -- i elt )
431 pick [ [ setup-each ] dip call ] dip finish-find ; inline
433 : (find-from) ( n seq quot quot' -- i elt )
434 [ 2dup bounds-check? ] 2dip
439 : (find-index) ( seq quot quot' -- i elt )
440 pick [ [ (each-index) ] dip call ] dip finish-find ; inline
442 : (find-index-from) ( n seq quot quot' -- i elt )
443 [ 2dup bounds-check? ] 2dip
444 [ (find-index) ] 2curry
448 : (accumulate) ( seq identity quot -- identity seq quot )
449 swapd [ curry keep ] curry ; inline
451 : (accumulate*) ( seq identity quot -- identity seq quot )
452 swapd [ dup ] compose ; inline
456 : each ( ... seq quot: ( ... x -- ... ) -- ... )
457 setup-each each-integer ; inline
459 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
460 -rot setup-each (each-integer) ; inline
462 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
465 : map-integers ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
466 [ over ] dip [ [ collect ] keep ] new-like ; inline
468 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
469 [ setup-each ] dip map-integers ; inline
471 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
474 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
475 [ [ drop ] prepose ] dip map-integers ; inline
477 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
478 { } replicate-as ; inline
480 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
481 over [ map-into ] keep ; inline
483 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
484 [ (accumulate) ] dip map-as ; inline
486 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
487 pick accumulate-as ; inline
489 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
490 (accumulate) map! ; inline
492 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
493 [ (accumulate*) ] dip map-as nip ; inline
495 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
496 pick accumulate*-as ; inline
498 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
499 (accumulate*) map! nip ; inline
501 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
502 (2each) each-integer ; inline
504 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) i -- ... )
505 [ (2each) ] dip -rot (each-integer) ; inline
507 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
508 [ -rot ] dip 2each ; inline
510 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
511 [ (2each) ] dip map-integers ; inline
513 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
514 pick 2map-as ; inline
516 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
517 (2each) all-integers? ; inline
519 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
520 (3each) each-integer ; inline
522 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
523 [ (3each) ] dip map-integers ; inline
525 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
526 [ pick ] dip swap 3map-as ; inline
528 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
529 [ (find-integer) ] (find-from) ; inline
531 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
532 [ find-integer ] (find) ; inline
534 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
535 [ nip find-last-integer ] (find-from) ; inline
537 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
538 [ [ 1 - ] dip find-last-integer ] (find) ; inline
540 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
541 [ (find-integer) ] (find-index-from) ; inline
543 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
544 [ find-integer ] (find-index) ; inline
546 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
547 setup-each all-integers? ; inline
549 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
550 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
554 : (selector-as) ( quot length exemplar -- selector accum )
555 new-resizable [ [ push-if ] 2curry ] keep ; inline
559 : selector-as ( quot exemplar -- selector accum )
560 [ length ] keep (selector-as) ; inline
562 : selector ( quot -- selector accum )
563 V{ } selector-as ; inline
565 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
566 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
568 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
569 over filter-as ; inline
571 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
572 [ [ not ] compose ] [ filter-as ] bi* ; inline
574 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
575 over reject-as ; inline
577 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
578 [ keep swap ] 2dip ? push ; inline
580 : 2selector ( quot -- selector accum1 accum2 )
581 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
583 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
584 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
586 : collector-for-as ( seq quot exemplar -- seq quot' vec )
587 [ over length ] dip new-resizable [ [ push ] curry compose ] keep ; inline
589 : collector-as ( quot exemplar -- quot' vec )
590 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
592 : collector-for ( seq quot -- seq quot' vec )
593 V{ } collector-for-as ; inline
595 : collector ( quot -- quot' vec )
596 V{ } collector-as ; inline
598 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
599 dup [ collector-as [ while ] dip ] curry dip like ; inline
601 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
602 { } produce-as ; inline
604 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
605 [ dup ] swap [ keep ] curry produce nip ; inline
607 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
608 (each-index) each-integer ; inline
610 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
611 [ dup length <iota> ] 2dip 2map-as ; inline
613 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
614 { } map-index-as ; inline
616 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
617 pick empty? [ 3drop ] [
618 [ [ drop first-unsafe ] dip call ]
619 [ [ bi* ] 2curry 1 each-from ]
623 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
624 swapd each-index ; inline
626 : index ( obj seq -- n )
627 [ = ] with find drop ;
629 : index-from ( obj i seq -- n )
630 rot [ = ] curry find-from drop ;
632 : last-index ( obj seq -- n )
633 [ = ] with find-last drop ;
635 : last-index-from ( obj i seq -- n )
636 rot [ = ] curry find-last-from drop ;
638 : indices ( obj seq -- indices )
639 swap [ = ] curry [ swap ] prepose V{ } clone [
640 [ push ] curry [ [ drop ] if ] curry compose each-index
645 : nths-unsafe ( indices seq -- seq' )
646 [ [ nth-unsafe ] curry ] keep map-as ;
650 : nths ( indices seq -- seq' )
651 [ [ nth ] curry ] keep map-as ;
653 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
654 find drop >boolean ; inline
656 : member? ( elt seq -- ? )
659 : member-eq? ( elt seq -- ? )
662 : remove ( elt seq -- newseq )
665 : remove-eq ( elt seq -- newseq )
666 [ eq? ] with reject ;
668 : sift ( seq -- newseq )
671 : harvest ( seq -- newseq )
676 : mismatch-unsafe ( n seq1 seq2 -- i )
677 [ 2nth-unsafe = not ] 2curry find-integer ; inline
681 : mismatch ( seq1 seq2 -- i )
682 [ min-length ] 2keep mismatch-unsafe ; inline
685 [ mismatch ] 2keep pick
686 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
688 : sequence= ( seq1 seq2 -- ? )
689 2dup [ length ] bi@ dupd =
690 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
692 ERROR: assert-sequence got expected ;
694 : assert-sequence= ( a b -- )
695 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
699 : sequence-hashcode-step ( oldhash newpart -- newhash )
700 integer>fixnum swap [
701 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
702 fixnum+fast fixnum+fast
703 ] keep fixnum-bitxor ; inline
707 : sequence-hashcode ( n seq -- x )
708 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
710 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
712 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
714 : move ( to from seq -- )
716 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
720 : move-unsafe ( to from seq -- )
722 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
724 : (filter!) ( ... quot: ( ... elt -- ... ? ) store scan seq -- ... )
726 [ move-unsafe ] 3keep
727 [ nth-unsafe -rot [ [ call ] keep ] dip rot [ 1 + ] when ] 2keep
730 ] [ nip set-length drop ] if ; inline recursive
734 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
735 swap [ [ 0 0 ] dip (filter!) ] keep ; inline
737 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
738 [ not ] compose filter! ; inline
740 : remove! ( elt seq -- seq )
743 : remove-eq! ( elt seq -- seq )
744 [ eq? ] with reject! ;
746 : prefix ( seq elt -- newseq )
747 over [ over length 1 + ] dip [
748 (1sequence) [ 1 swap copy-unsafe ] keep
751 : suffix ( seq elt -- newseq )
752 over [ over length 1 + ] dip [
753 [ [ over length ] dip set-nth-unsafe ] keep
754 [ 0 swap copy-unsafe ] keep
757 : suffix! ( seq elt -- seq ) over push ; inline
759 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
761 : last ( seq -- elt )
763 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
767 : last-unsafe ( seq -- elt )
768 [ length 1 - ] [ nth-unsafe ] bi ; inline
772 : set-last ( elt seq -- )
774 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
776 : pop* ( seq -- ) [ length 1 - ] [ shorten ] bi ;
780 : move-backward ( shift from to seq -- )
784 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
788 : move-forward ( shift from to seq -- )
792 [ [ pick [ dup dup ] dip + swap ] dip move-unsafe 1 - ] keep
796 : (open-slice) ( shift from to seq ? -- )
798 [ [ 1 - ] bi@ ] dip move-forward
800 [ over - ] 2dip move-backward
803 : open-slice ( shift from seq -- )
807 pick over length + over
808 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
814 : delete-slice ( from to seq -- )
815 check-slice [ over [ - ] dip ] dip open-slice ;
817 : remove-nth! ( n seq -- seq )
818 [ [ dup 1 + ] dip delete-slice ] keep ;
820 : snip ( from to seq -- head tail )
821 [ swap head ] [ swap tail ] bi-curry bi* ; inline
823 : snip-slice ( from to seq -- head tail )
824 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
826 : replace-slice ( new from to seq -- seq' )
827 snip-slice surround ;
829 : remove-nth ( n seq -- seq' )
830 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
833 [ length 1 - ] keep over 0 >=
834 [ [ nth-unsafe ] [ shorten ] 2bi ]
835 [ bounds-error ] if ;
837 : exchange ( m n seq -- )
838 [ nip bounds-check 2drop ]
839 [ bounds-check 3drop ]
843 : midpoint@ ( seq -- n ) length 2/ ; inline
845 : reverse! ( seq -- seq )
847 [ midpoint@ ] [ length ] [ ] tri
848 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
852 : reverse ( seq -- newseq )
854 dup [ length ] keep new-sequence
855 [ 0 swap copy-unsafe ] keep reverse!
858 GENERIC: sum-lengths ( seq -- n )
860 M: object sum-lengths
861 0 [ length + ] reduce ;
863 M: repetition sum-lengths
864 [ length>> ] [ elt>> length ] bi * ;
866 : concat-as ( seq exemplar -- newseq )
868 [ dup sum-lengths ] dip new-resizable
869 [ [ push-all ] curry each ] keep
872 : concat ( seq -- newseq )
873 [ { } ] [ dup first concat-as ] if-empty ;
877 : joined-length ( seq glue -- n )
878 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
882 : join-as ( seq glue exemplar -- newseq )
883 over empty? [ nip concat-as ] [
885 2dup joined-length over new-resizable [
886 [ [ push-all ] 2curry ]
887 [ nip [ push-all ] curry ] 2bi
893 : join ( seq glue -- newseq )
896 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
898 [ over length [-] dup 0 = [ drop ] ] dip
899 [ <repetition> ] curry
900 ] dip compose if ; inline
902 : pad-head ( seq n elt -- padded )
903 [ swap dup append-as ] padding ;
905 : pad-tail ( seq n elt -- padded )
908 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ; inline
909 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ; inline
910 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
911 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
913 : head? ( seq begin -- ? )
917 [ length [ head-slice ] keep swap ] keep
921 : tail? ( seq end -- ? )
925 [ length [ tail-slice* ] keep swap ] keep
929 : cut-slice ( seq n -- before-slice after-slice )
930 [ head-slice ] [ tail-slice ] 2bi ; inline
932 : insert-nth ( elt n seq -- seq' )
933 swap cut-slice [ swap suffix ] dip append ;
935 : halves ( seq -- first-slice second-slice )
936 dup midpoint@ cut-slice ; inline
940 : nth2-unsafe ( n seq -- a b )
941 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
943 : nth3-unsafe ( n seq -- a b c )
944 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
946 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
947 ! We can't use case here since combinators depends on
952 [ 2nip swap nth-unsafe ]
953 [ -rot [ drop swap nth2-unsafe ] dip call ]
954 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
957 [ 2/ ] [ over - ] bi [ 2dup + ] dip
958 [ (binary-reduce) ] [ 2curry ] curry 2bi@
959 pick [ 3bi ] dip call
960 ] if ; inline recursive
964 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
965 pick length 0 max 0 swap (binary-reduce) ; inline
967 : cut ( seq n -- before after )
968 [ head ] [ tail ] 2bi ;
970 : cut* ( seq n -- before after )
971 [ head* ] [ tail* ] 2bi ;
975 : (subseq-start-from) ( subseq seq n length -- subseq seq ? )
977 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
978 ] all-integers? nip ; inline
982 : subseq-start-from ( subseq seq n -- i )
983 pick length [ pick length swap - 1 + ] keep
984 [ (subseq-start-from) ] curry (find-integer) 2nip ;
986 : subseq-start ( subseq seq -- i ) 0 subseq-start-from ; inline
988 ALIAS: start subseq-start
989 ALIAS: start* subseq-start-from
991 : subseq? ( subseq seq -- ? ) subseq-start >boolean ;
993 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
994 2dup mismatch [ 2dup min-length ] unless*
995 [ tail-slice ] curry bi@ ;
997 : unclip ( seq -- rest first )
998 [ rest ] [ first-unsafe ] bi ;
1000 : unclip-last ( seq -- butlast last )
1001 [ but-last ] [ last-unsafe ] bi ;
1003 : unclip-slice ( seq -- rest-slice first )
1004 [ rest-slice ] [ first-unsafe ] bi ; inline
1006 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
1007 [ [ dup first ] dip [ call ] keep ] dip compose
1008 swapd 1 each-from ; inline
1010 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
1011 [ [ 2dup [ first ] bi@ ] dip [ call ] keep ] dip compose
1012 [ -rot ] dip 1 2each-from ; inline
1016 : (map-find) ( seq quot find-quot -- result elt )
1017 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1021 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1022 [ find ] (map-find) ; inline
1024 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1025 [ find-last ] (map-find) ; inline
1027 : unclip-last-slice ( seq -- butlast-slice last )
1028 [ but-last-slice ] [ last-unsafe ] bi ; inline
1032 : (trim-head) ( seq quot -- seq n )
1033 over [ [ not ] compose find drop ] dip swap
1034 [ dup length ] unless* ; inline
1036 : (trim-tail) ( seq quot -- seq n )
1037 over [ [ not ] compose find-last drop ?1+ ] dip
1042 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1043 (trim-head) tail-slice ; inline
1045 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1046 (trim-head) tail ; inline
1048 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1049 (trim-tail) head-slice ; inline
1051 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1052 (trim-tail) head ; inline
1054 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1055 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1057 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1058 [ trim-slice ] [ drop ] 2bi like ; inline
1060 GENERIC: sum ( seq -- n )
1061 M: object sum 0 [ + ] binary-reduce ; inline
1062 M: iota sum length dup 1 - * 2/ ; inline
1063 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1065 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1067 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1069 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1071 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1072 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1074 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1075 [ 1 0 ? ] compose map-sum ; inline
1077 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1078 [ with each ] 2curry each ; inline
1080 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1081 [ with map ] 2curry map ; inline
1083 : cartesian-product ( seq1 seq2 -- newseq )
1084 [ { } 2sequence ] cartesian-map ;
1088 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1090 [ keep swap ] curry [ [ first ] dip call ] 2keep
1091 [ curry 2dip pick over ] curry
1093 [ [ 2drop ] [ [ 2drop ] 2dip ] if ] compose
1094 ] bi* compose 1 each-from drop ; inline
1098 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1099 [ after? ] select-by ; inline
1101 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1102 [ before? ] select-by ; inline
1104 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1106 : longest ( seqs -- elt ) [ length ] supremum-by ;
1108 ! We hand-optimize flip to such a degree because type hints
1109 ! cannot express that an array is an array of arrays yet, and
1110 ! this word happens to be performance-critical since the compiler
1111 ! itself uses it. Optimizing it like this reduced compile time.
1114 : generic-flip ( matrix -- newmatrix )
1116 [ first-unsafe length 1 ] keep
1117 [ length min ] setup-each (each-integer) <iota>
1119 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
1123 : array-length ( array -- len )
1124 { array } declare length>> ; inline
1126 : array-flip ( matrix -- newmatrix )
1129 [ first-unsafe array-length 1 ] keep
1130 [ array-length min ] setup-each (each-integer) <iota>
1132 [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
1136 : flip ( matrix -- newmatrix )
1140 [ array-flip ] [ generic-flip ] if
1141 ] [ generic-flip ] if