1 ! Copyright (C) 2005, 2008 Slava Pestov, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors kernel kernel.private slots.private math
4 math.private math.order ;
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 ;
23 GENERIC: lengthen ( n seq -- )
24 GENERIC: shorten ( n seq -- )
26 M: sequence lengthen 2dup length > [ set-length ] [ 2drop ] if ;
28 M: sequence shorten 2dup length < [ set-length ] [ 2drop ] if ;
30 : empty? ( seq -- ? ) length 0 = ; inline
32 : if-empty ( seq quot1 quot2 -- )
33 [ dup empty? ] [ [ drop ] prepose ] [ ] tri* if ; inline
35 : when-empty ( seq quot -- ) [ ] if-empty ; inline
37 : unless-empty ( seq quot -- ) [ ] swap if-empty ; inline
39 : delete-all ( seq -- ) 0 swap set-length ;
41 : first ( seq -- first ) 0 swap nth ; inline
42 : second ( seq -- second ) 1 swap nth ; inline
43 : third ( seq -- third ) 2 swap nth ; inline
44 : fourth ( seq -- fourth ) 3 swap nth ; inline
46 : set-first ( first seq -- ) 0 swap set-nth ; inline
47 : set-second ( second seq -- ) 1 swap set-nth ; inline
48 : set-third ( third seq -- ) 2 swap set-nth ; inline
49 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
51 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
53 : bounds-check? ( n seq -- ? )
54 dupd length < [ 0 >= ] [ drop f ] if ; inline
56 ERROR: bounds-error index seq ;
58 : bounds-check ( n seq -- n seq )
59 2dup bounds-check? [ bounds-error ] unless ; inline
61 MIXIN: immutable-sequence
63 ERROR: immutable seq ;
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 -- )
84 GENERIC: new-sequence-unsafe ( len seq -- newseq ) flushable
86 M: sequence nth bounds-check nth-unsafe ;
87 M: sequence set-nth bounds-check set-nth-unsafe ;
89 M: sequence nth-unsafe nth ;
90 M: sequence set-nth-unsafe set-nth ;
92 M: sequence new-sequence-unsafe new-sequence ;
94 ! The f object supports the sequence protocol trivially
97 M: f like drop [ f ] when-empty ;
99 INSTANCE: f immutable-sequence
101 ! Integers support the sequence protocol
103 M: integer nth-unsafe drop ;
105 INSTANCE: integer immutable-sequence
108 0 swap nth-unsafe ; inline
111 [ first-unsafe ] [ 1 swap nth-unsafe ] bi ; inline
114 [ first2-unsafe ] [ 2 swap nth-unsafe ] bi ; inline
117 [ first3-unsafe ] [ 3 swap nth-unsafe ] bi ; inline
119 : exchange-unsafe ( m n seq -- )
120 [ tuck [ nth-unsafe ] 2bi@ ]
121 [ tuck [ set-nth-unsafe ] 2bi@ ] 3bi ; inline
123 : (head) ( seq n -- from to seq ) 0 spin ; inline
125 : (tail) ( seq n -- from to seq ) over length rot ; inline
127 : from-end [ dup length ] dip - ; inline
130 tuck 1 swap set-nth-unsafe
131 tuck 0 swap set-nth-unsafe ; inline
134 tuck 2 swap set-nth-unsafe
138 tuck 3 swap set-nth-unsafe
143 : 2sequence ( obj1 obj2 exemplar -- seq )
144 2 swap [ (2sequence) ] new-like ; inline
146 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
147 3 swap [ (3sequence) ] new-like ; inline
149 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
150 4 swap [ (4sequence) ] new-like ; inline
152 : first2 ( seq -- first second )
153 1 swap bounds-check nip first2-unsafe ; flushable
155 : first3 ( seq -- first second third )
156 2 swap bounds-check nip first3-unsafe ; flushable
158 : first4 ( seq -- first second third fourth )
159 3 swap bounds-check nip first4-unsafe ; flushable
161 : ?nth ( n seq -- elt/f )
162 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; flushable
164 MIXIN: virtual-sequence
165 GENERIC: virtual-seq ( seq -- seq' )
166 GENERIC: virtual@ ( n seq -- n' seq' )
168 M: virtual-sequence nth virtual@ nth ;
169 M: virtual-sequence set-nth virtual@ set-nth ;
170 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ;
171 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ;
172 M: virtual-sequence like virtual-seq like ;
173 M: virtual-sequence new-sequence virtual-seq new-sequence ;
175 INSTANCE: virtual-sequence sequence
177 ! A reversal of an underlying sequence.
178 TUPLE: reversed { seq read-only } ;
180 C: <reversed> reversed
182 M: reversed virtual-seq seq>> ;
184 M: reversed virtual@ seq>> [ length swap - 1- ] keep ;
186 M: reversed length seq>> length ;
188 INSTANCE: reversed virtual-sequence
190 ! A slice of another sequence.
196 : collapse-slice ( m n slice -- m' n' seq )
197 [ from>> ] [ seq>> ] bi [ tuck [ + ] 2bi@ ] dip ; inline
199 ERROR: slice-error from to seq reason ;
201 : check-slice ( from to seq -- from to seq )
202 pick 0 < [ "start < 0" slice-error ] when
203 dup length pick < [ "end > sequence" slice-error ] when
204 2over > [ "start > end" slice-error ] when ; inline
206 : <slice> ( from to seq -- slice )
207 dup slice? [ collapse-slice ] when
211 M: slice virtual-seq seq>> ;
213 M: slice virtual@ [ from>> + ] [ seq>> ] bi ;
215 M: slice length [ to>> ] [ from>> ] bi - ;
217 : short ( seq n -- seq n' ) over length min ; inline
219 : head-slice ( seq n -- slice ) (head) <slice> ; inline
221 : tail-slice ( seq n -- slice ) (tail) <slice> ; inline
223 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
225 : head-slice* ( seq n -- slice ) from-end head-slice ; inline
227 : tail-slice* ( seq n -- slice ) from-end tail-slice ; inline
229 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
231 INSTANCE: slice virtual-sequence
233 ! One element repeated many times
234 TUPLE: repetition { len read-only } { elt read-only } ;
236 C: <repetition> repetition
238 M: repetition length len>> ;
239 M: repetition nth-unsafe nip elt>> ;
241 INSTANCE: repetition immutable-sequence
245 : check-length ( n -- n )
247 dup integer? [ "length not an integer" throw ] unless ; inline
249 : ((copy)) ( dst i src j n -- dst i src j n )
251 + swap nth-unsafe -roll [
252 + swap set-nth-unsafe
256 : (copy) ( dst i src j n -- dst )
257 dup 0 <= [ 2drop 2drop ] [ 1- ((copy)) (copy) ] if ;
260 : prepare-subseq ( from to seq -- dst i src j n )
261 #! The check-length call forces partial dispatch
262 [ [ swap - ] dip new-sequence-unsafe dup 0 ] 3keep
263 -rot drop roll length check-length ; inline
265 : check-copy ( src n dst -- )
266 over 0 < [ bounds-error ] when
267 [ swap length + ] dip lengthen ; inline
271 : subseq ( from to seq -- subseq )
272 [ check-slice prepare-subseq (copy) ] [ like ] bi ;
274 : head ( seq n -- headseq ) (head) subseq ;
276 : tail ( seq n -- tailseq ) (tail) subseq ;
278 : rest ( seq -- tailseq ) 1 tail ;
280 : head* ( seq n -- headseq ) from-end head ;
282 : tail* ( seq n -- tailseq ) from-end tail ;
284 : but-last ( seq -- headseq ) 1 head* ;
286 : copy ( src i dst -- )
287 #! The check-length call forces partial dispatch
288 pick length check-length [ 3dup check-copy spin 0 ] dip
291 M: sequence clone-like
292 [ dup length ] dip new-sequence [ 0 swap copy ] keep ;
294 M: immutable-sequence clone-like like ;
296 : push-all ( src dest -- ) [ length ] [ copy ] bi ;
300 : (append) ( seq1 seq2 accum -- accum )
301 [ [ over length ] dip copy ]
307 : append-as ( seq1 seq2 exemplar -- newseq )
308 [ over length over length + ] dip
309 [ (append) ] new-like ; inline
311 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
312 [ pick length pick length pick length + + ] dip [
313 [ [ pick length pick length + ] dip copy ]
317 : append ( seq1 seq2 -- newseq ) over append-as ;
319 : prepend ( seq1 seq2 -- newseq ) swap append ; inline
321 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
323 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
325 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
327 : change-nth ( i seq quot -- )
328 [ [ nth ] dip call ] 3keep drop set-nth ; inline
330 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
332 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
336 : (each) ( seq quot -- n quot' )
337 [ dup length swap [ nth-unsafe ] curry ] dip compose ; inline
339 : (collect) ( quot into -- quot' )
340 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
342 : collect ( n quot into -- )
343 (collect) each-integer ; inline
345 : map-into ( seq quot into -- )
346 [ (each) ] dip collect ; inline
348 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
349 [ over ] dip nth-unsafe [ nth-unsafe ] dip ; inline
351 : (2each) ( seq1 seq2 quot -- n quot' )
352 [ [ min-length ] 2keep ] dip
353 [ [ 2nth-unsafe ] dip call ] 3curry ; inline
355 : 2map-into ( seq1 seq2 quot into -- newseq )
356 [ (2each) ] dip collect ; inline
358 : finish-find ( i seq -- i elt )
359 over [ dupd nth-unsafe ] [ drop f ] if ; inline
361 : (find) ( seq quot quot' -- i elt )
362 pick [ [ (each) ] dip call ] dip finish-find ; inline
364 : (find-from) ( n seq quot quot' -- i elt )
365 [ 2dup bounds-check? ] 2dip
370 : (monotonic) ( seq quot -- ? )
371 [ 2dup nth-unsafe rot 1+ rot nth-unsafe ]
372 prepose curry ; inline
374 : (interleave) ( n elt between quot -- )
375 roll 0 = [ nip ] [ swapd 2slip ] if call ; inline
379 : each ( seq quot -- )
380 (each) each-integer ; inline
382 : reduce ( seq identity quot -- result )
385 : map-as ( seq quot exemplar -- newseq )
386 [ over length ] dip [ [ map-into ] keep ] new-like ; inline
388 : map ( seq quot -- newseq )
391 : replicate ( seq quot -- newseq )
392 [ drop ] prepose map ; inline
394 : replicate-as ( seq quot exemplar -- newseq )
395 [ [ drop ] prepose ] dip map-as ; inline
397 : change-each ( seq quot -- )
398 over map-into ; inline
400 : accumulate ( seq identity quot -- final newseq )
401 swapd [ pick slip ] curry map ; inline
403 : 2each ( seq1 seq2 quot -- )
404 (2each) each-integer ; inline
406 : 2reverse-each ( seq1 seq2 quot -- )
407 [ [ <reversed> ] bi@ ] dip 2each ; inline
409 : 2reduce ( seq1 seq2 identity quot -- result )
410 [ -rot ] dip 2each ; inline
412 : 2map-as ( seq1 seq2 quot exemplar -- newseq )
413 [ 2over min-length ] dip
414 [ [ 2map-into ] keep ] new-like ; inline
416 : 2map ( seq1 seq2 quot -- newseq )
417 pick 2map-as ; inline
419 : 2change-each ( seq1 seq2 quot -- )
420 pick 2map-into ; inline
422 : 2all? ( seq1 seq2 quot -- ? )
423 (2each) all-integers? ; inline
425 : find-from ( n seq quot -- i elt )
426 [ (find-integer) ] (find-from) ; inline
428 : find ( seq quot -- i elt )
429 [ find-integer ] (find) ; inline
431 : find-last-from ( n seq quot -- i elt )
432 [ nip find-last-integer ] (find-from) ; inline
434 : find-last ( seq quot -- i elt )
435 [ [ 1- ] dip find-last-integer ] (find) ; inline
437 : all? ( seq quot -- ? )
438 (each) all-integers? ; inline
440 : push-if ( elt quot accum -- )
441 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
443 : pusher ( quot -- quot accum )
444 V{ } clone [ [ push-if ] 2curry ] keep ; inline
446 : filter ( seq quot -- subseq )
447 over [ pusher [ each ] dip ] dip like ; inline
449 : push-either ( elt quot accum1 accum2 -- )
450 [ keep swap ] 2dip ? push ; inline
452 : 2pusher ( quot -- quot accum1 accum2 )
453 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
455 : partition ( seq quot -- trueseq falseseq )
456 over [ 2pusher [ each ] 2dip ] dip tuck [ like ] 2bi@ ; inline
458 : monotonic? ( seq quot -- ? )
459 [ dup length 1- swap ] dip (monotonic) all? ; inline
461 : interleave ( seq between quot -- )
462 [ (interleave) ] 2curry [ dup length swap ] dip 2each ; inline
464 : accumulator ( quot -- quot' vec )
465 V{ } clone [ [ push ] curry compose ] keep ; inline
467 : produce-as ( pred quot tail exemplar -- seq )
468 [ swap accumulator [ swap while ] dip ] dip like ; inline
470 : produce ( pred quot tail -- seq )
471 { } produce-as ; inline
473 : follow ( obj quot -- seq )
474 [ dup ] swap [ keep ] curry [ ] produce nip ; inline
476 : prepare-index ( seq quot -- seq n quot )
477 [ dup length ] dip ; inline
479 : each-index ( seq quot -- )
480 prepare-index 2each ; inline
482 : map-index ( seq quot -- )
483 prepare-index 2map ; inline
485 : reduce-index ( seq identity quot -- )
486 swapd each-index ; inline
488 : index ( obj seq -- n )
489 [ = ] with find drop ;
491 : index-from ( obj i seq -- n )
492 rot [ = ] curry find-from drop ;
494 : last-index ( obj seq -- n )
495 [ = ] with find-last drop ;
497 : last-index-from ( obj i seq -- n )
498 rot [ = ] curry find-last-from drop ;
500 : indices ( obj seq -- indices )
502 [ rot = [ over push ] [ drop ] if ]
505 : nths ( indices seq -- seq' )
508 : contains? ( seq quot -- ? )
509 find drop >boolean ; inline
511 : member? ( elt seq -- ? )
512 [ = ] with contains? ;
514 : memq? ( elt seq -- ? )
515 [ eq? ] with contains? ;
517 : remove ( elt seq -- newseq )
518 [ = not ] with filter ;
520 : remq ( elt seq -- newseq )
521 [ eq? not ] with filter ;
523 : sift ( seq -- newseq )
526 : harvest ( seq -- newseq )
527 [ empty? not ] filter ;
529 : mismatch ( seq1 seq2 -- i )
531 [ 2nth-unsafe = not ] 2curry
536 [ -rot 2nth-unsafe <=> ] [ [ length ] compare ] if* ;
538 : sequence= ( seq1 seq2 -- ? )
539 2dup [ length ] bi@ =
540 [ mismatch not ] [ 2drop f ] if ; inline
542 : sequence-hashcode-step ( oldhash newpart -- newhash )
544 dup -2 fixnum-shift-fast swap 5 fixnum-shift-fast
545 fixnum+fast fixnum+fast
546 ] keep fixnum-bitxor ; inline
548 : sequence-hashcode ( n seq -- x )
549 0 -rot [ hashcode* sequence-hashcode-step ] with each ; inline
551 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
553 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
555 : move ( to from seq -- )
557 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
561 : (filter-here) ( quot: ( elt -- ? ) store scan seq -- )
564 [ nth-unsafe pick call [ 1+ ] when ] 2keep
567 ] [ nip set-length drop ] if ; inline recursive
571 : filter-here ( seq quot -- )
572 0 0 roll (filter-here) ; inline
574 : delete ( elt seq -- )
575 [ = not ] with filter-here ;
577 : delq ( elt seq -- )
578 [ eq? not ] with filter-here ;
580 : prefix ( seq elt -- newseq )
581 over [ over length 1+ ] dip [
582 [ 0 swap set-nth-unsafe ] keep
586 : suffix ( seq elt -- newseq )
587 over [ over length 1+ ] dip [
588 [ [ over length ] dip set-nth-unsafe ] keep
592 : peek ( seq -- elt ) [ length 1- ] [ nth ] bi ;
594 : pop* ( seq -- ) [ length 1- ] [ shorten ] bi ;
598 : move-backward ( shift from to seq -- )
602 [ [ 2over + pick ] dip move [ 1+ ] dip ] keep
606 : move-forward ( shift from to seq -- )
610 [ [ pick [ dup dup ] dip + swap ] dip move 1- ] keep
614 : (open-slice) ( shift from to seq ? -- )
616 [ [ 1- ] bi@ ] dip move-forward
618 [ over - ] 2dip move-backward
623 : open-slice ( shift from seq -- )
627 pick over length + over
628 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
632 : delete-slice ( from to seq -- )
633 check-slice [ over [ - ] dip ] dip open-slice ;
635 : delete-nth ( n seq -- )
636 [ dup 1+ ] dip delete-slice ;
638 : replace-slice ( new from to seq -- )
639 [ [ [ dup pick length + ] dip - over ] dip open-slice ] keep
642 : remove-nth ( n seq -- seq' )
643 [ swap head-slice ] [ swap 1+ tail-slice ] 2bi append ;
646 [ length 1- ] [ [ nth ] [ shorten ] 2bi ] bi ;
648 : all-equal? ( seq -- ? ) [ = ] monotonic? ;
650 : all-eq? ( seq -- ? ) [ eq? ] monotonic? ;
652 : exchange ( m n seq -- )
653 pick over bounds-check 2drop 2dup bounds-check 2drop
656 : reverse-here ( seq -- )
659 tuck - 1- rot exchange-unsafe
662 : reverse ( seq -- newseq )
664 dup [ length ] keep new-sequence
666 [ reverse-here ] keep
669 : sum-lengths ( seq -- n )
670 0 [ length + ] reduce ;
672 : concat ( seq -- newseq )
677 [ first new-resizable ] keep
678 [ [ over push-all ] each ] keep
684 : joined-length ( seq glue -- n )
685 [ dup sum-lengths swap length 1 [-] ] dip length * + ;
689 : join ( seq glue -- newseq )
691 2dup joined-length over new-resizable spin
692 [ dup pick push-all ] [ pick push-all ] interleave drop
695 : padding ( seq n elt quot -- newseq )
697 [ over length [-] dup 0 = [ drop ] ] dip
698 [ <repetition> ] curry
699 ] dip compose if ; inline
701 : pad-left ( seq n elt -- padded )
702 [ swap dup append-as ] padding ;
704 : pad-right ( seq n elt -- padded )
707 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ;
709 : head? ( seq begin -- ? )
713 tuck length head-slice sequence=
716 : tail? ( seq end -- ? )
720 tuck length tail-slice* sequence=
723 : cut-slice ( seq n -- before-slice after-slice )
724 [ head-slice ] [ tail-slice ] 2bi ;
726 : insert-nth ( elt n seq -- seq' )
727 swap cut-slice [ swap suffix ] dip append ;
729 : midpoint@ ( seq -- n ) length 2/ ; inline
731 : halves ( seq -- first-slice second-slice )
732 dup midpoint@ cut-slice ;
734 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
735 #! We can't use case here since combinators depends on
737 pick length dup 0 3 between? [
741 [ [ drop first2 ] dip call ]
742 [ [ drop first3 ] dip bi@ ]
747 [ [ binary-reduce ] 2curry bi@ ] keep
749 ] if ; inline recursive
751 : cut ( seq n -- before after )
752 [ head ] [ tail ] 2bi ;
754 : cut* ( seq n -- before after )
755 [ head* ] [ tail* ] 2bi ;
759 : (start) ( subseq seq n -- subseq seq ? )
761 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
766 : start* ( subseq seq n -- i )
767 pick length pick length swap - 1+
768 [ (start) ] find-from
771 : start ( subseq seq -- i ) 0 start* ; inline
773 : subseq? ( subseq seq -- ? ) start >boolean ;
775 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
776 2dup mismatch [ 2dup min-length ] unless*
777 tuck [ tail-slice ] 2bi@ ;
779 : unclip ( seq -- rest first )
780 [ rest ] [ first-unsafe ] bi ;
782 : unclip-last ( seq -- butlast last )
783 [ but-last ] [ peek ] bi ;
785 : unclip-slice ( seq -- rest-slice first )
786 [ rest-slice ] [ first-unsafe ] bi ; inline
788 : 2unclip-slice ( seq1 seq2 -- rest-slice1 rest-slice2 first1 first2 )
789 [ unclip-slice ] bi@ swapd ; inline
791 : map-reduce ( seq map-quot reduce-quot -- result )
792 [ [ unclip-slice ] dip [ call ] keep ] dip
793 compose reduce ; inline
795 : 2map-reduce ( seq1 seq2 map-quot reduce-quot -- result )
796 [ [ 2unclip-slice ] dip [ call ] keep ] dip
797 compose 2reduce ; inline
799 : unclip-last-slice ( seq -- butlast-slice last )
800 [ but-last-slice ] [ peek ] bi ; inline
802 : <flat-slice> ( seq -- slice )
803 dup slice? [ { } like ] when 0 over length rot <slice> ;
806 : trim-left-slice ( seq quot -- slice )
807 over [ [ not ] compose find drop ] dip swap
808 [ tail-slice ] [ dup length tail-slice ] if* ; inline
810 : trim-left ( seq quot -- newseq )
811 over [ trim-left-slice ] dip like ; inline
813 : trim-right-slice ( seq quot -- slice )
814 over [ [ not ] compose find-last drop ] dip swap
815 [ 1+ head-slice ] [ 0 head-slice ] if* ; inline
817 : trim-right ( seq quot -- newseq )
818 over [ trim-right-slice ] dip like ; inline
820 : trim-slice ( seq quot -- slice )
821 [ trim-left-slice ] [ trim-right-slice ] bi ; inline
823 : trim ( seq quot -- newseq )
824 over [ trim-slice ] dip like ; inline
826 : sum ( seq -- n ) 0 [ + ] binary-reduce ;
828 : product ( seq -- n ) 1 [ * ] binary-reduce ;
830 : infimum ( seq -- n ) dup first [ min ] reduce ;
832 : supremum ( seq -- n ) dup first [ max ] reduce ;
834 : sigma ( seq quot -- n ) [ + ] compose 0 swap reduce ; inline
836 : count ( seq quot -- n ) [ 1 0 ? ] compose sigma ; inline
838 ! We hand-optimize flip to such a degree because type hints
839 ! cannot express that an array is an array of arrays yet, and
840 ! this word happens to be performance-critical since the compiler
841 ! itself uses it. Optimizing it like this reduced compile time.
844 : generic-flip ( matrix -- newmatrix )
845 [ dup first length [ length min ] reduce ] keep
846 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
850 : array-length ( array -- len )
851 { array } declare length>> ;
853 : array-flip ( matrix -- newmatrix )
854 [ dup first array-length [ array-length min ] reduce ] keep
855 [ [ array-nth ] with { } map-as ] curry { } map-as ;
859 : flip ( matrix -- newmatrix )
863 [ array-flip ] [ generic-flip ] if
864 ] [ generic-flip ] if