1 ! Copyright (C) 2005, 2009 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
34 : (if-empty) ( seq quot1 quot2 quot3 -- )
35 [ [ drop ] prepose ] [ ] tri* if ; inline
39 : if-empty ( seq quot1 quot2 -- )
40 [ dup empty? ] (if-empty) ; inline
42 : when-empty ( seq quot -- ) [ ] if-empty ; inline
44 : unless-empty ( seq quot -- ) [ ] swap if-empty ; inline
46 : if-zero ( n quot1 quot2 -- )
47 [ dup zero? ] (if-empty) ; inline
49 : when-zero ( seq quot -- ) [ ] if-zero ; inline
51 : unless-zero ( seq quot -- ) [ ] swap if-zero ; inline
53 : delete-all ( seq -- ) 0 swap set-length ;
55 : first ( seq -- first ) 0 swap nth ; inline
56 : second ( seq -- second ) 1 swap nth ; inline
57 : third ( seq -- third ) 2 swap nth ; inline
58 : fourth ( seq -- fourth ) 3 swap nth ; inline
60 : set-first ( first seq -- ) 0 swap set-nth ; inline
61 : set-second ( second seq -- ) 1 swap set-nth ; inline
62 : set-third ( third seq -- ) 2 swap set-nth ; inline
63 : set-fourth ( fourth seq -- ) 3 swap set-nth ; inline
65 : push ( elt seq -- ) [ length ] [ set-nth ] bi ;
67 : bounds-check? ( n seq -- ? )
68 dupd length < [ 0 >= ] [ drop f ] if ; inline
70 ERROR: bounds-error index seq ;
72 : bounds-check ( n seq -- n seq )
73 2dup bounds-check? [ bounds-error ] unless ; inline
75 MIXIN: immutable-sequence
77 ERROR: immutable seq ;
79 M: immutable-sequence set-nth immutable ;
81 INSTANCE: immutable-sequence sequence
85 : array-nth ( n array -- elt )
86 swap 2 fixnum+fast slot ; inline
88 : set-array-nth ( elt n array -- )
89 swap 2 fixnum+fast set-slot ; inline
91 : dispatch ( n array -- ) array-nth call ;
93 GENERIC: resize ( n seq -- newseq ) flushable
95 ! Unsafe sequence protocol for inner loops
96 GENERIC: nth-unsafe ( n seq -- elt ) flushable
97 GENERIC: set-nth-unsafe ( elt n seq -- )
99 M: sequence nth bounds-check nth-unsafe ;
100 M: sequence set-nth bounds-check set-nth-unsafe ;
102 M: sequence nth-unsafe nth ;
103 M: sequence set-nth-unsafe set-nth ;
105 : change-nth-unsafe ( i seq quot -- )
106 [ [ nth-unsafe ] dip call ] 3keep drop set-nth-unsafe ; inline
108 ! The f object supports the sequence protocol trivially
110 M: f nth-unsafe nip ;
111 M: f like drop [ f ] when-empty ;
113 INSTANCE: f immutable-sequence
115 ! Integers support the sequence protocol
117 M: integer nth-unsafe drop ;
119 INSTANCE: integer immutable-sequence
123 ! In the future, this will replace integer sequences
124 TUPLE: iota { n integer read-only } ;
126 : iota ( n -- iota ) \ iota boa ; inline
131 M: iota nth-unsafe drop ;
133 INSTANCE: iota immutable-sequence
135 : first-unsafe ( seq -- first )
136 0 swap nth-unsafe ; inline
138 : first2-unsafe ( seq -- first second )
139 [ first-unsafe ] [ 1 swap nth-unsafe ] bi ; inline
141 : first3-unsafe ( seq -- first second third )
142 [ first2-unsafe ] [ 2 swap nth-unsafe ] bi ; inline
144 : first4-unsafe ( seq -- first second third fourth )
145 [ first3-unsafe ] [ 3 swap nth-unsafe ] bi ; inline
147 : exchange-unsafe ( m n seq -- )
148 [ [ nth-unsafe ] curry bi@ ]
149 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
151 : (head) ( seq n -- from to seq ) [ 0 ] 2dip swap ; inline
153 : (tail) ( seq n -- from to seq ) swap [ length ] keep ; inline
155 : from-end ( seq n -- seq n' ) [ dup length ] dip - ; inline
157 : (1sequence) ( obj seq -- seq )
158 [ 0 swap set-nth-unsafe ] keep ; inline
160 : (2sequence) ( obj1 obj2 seq -- seq )
161 [ 1 swap set-nth-unsafe ] keep
164 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
165 [ 2 swap set-nth-unsafe ] keep
168 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
169 [ 3 swap set-nth-unsafe ] keep
174 : 1sequence ( obj exemplar -- seq )
175 1 swap [ (1sequence) ] new-like ; inline
177 : 2sequence ( obj1 obj2 exemplar -- seq )
178 2 swap [ (2sequence) ] new-like ; inline
180 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
181 3 swap [ (3sequence) ] new-like ; inline
183 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
184 4 swap [ (4sequence) ] new-like ; inline
186 : first2 ( seq -- first second )
187 1 swap bounds-check nip first2-unsafe ; flushable
189 : first3 ( seq -- first second third )
190 2 swap bounds-check nip first3-unsafe ; flushable
192 : first4 ( seq -- first second third fourth )
193 3 swap bounds-check nip first4-unsafe ; flushable
195 : ?nth ( n seq -- elt/f )
196 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
198 MIXIN: virtual-sequence
199 GENERIC: virtual-seq ( seq -- seq' )
200 GENERIC: virtual@ ( n seq -- n' seq' )
202 M: virtual-sequence nth virtual@ nth ;
203 M: virtual-sequence set-nth virtual@ set-nth ;
204 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ;
205 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ;
206 M: virtual-sequence like virtual-seq like ;
207 M: virtual-sequence new-sequence virtual-seq new-sequence ;
209 INSTANCE: virtual-sequence sequence
211 ! A reversal of an underlying sequence.
212 TUPLE: reversed { seq read-only } ;
214 C: <reversed> reversed
216 M: reversed virtual-seq seq>> ;
218 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ;
220 M: reversed length seq>> length ;
222 INSTANCE: reversed virtual-sequence
224 ! A slice of another sequence.
230 : collapse-slice ( m n slice -- m' n' seq )
231 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
233 TUPLE: slice-error from to seq reason ;
235 : slice-error ( from to seq ? string -- from to seq )
236 [ \ slice-error boa throw ] curry when ; inline
238 : check-slice ( from to seq -- from to seq )
240 [ 2drop 0 < "start < 0" slice-error ]
241 [ [ drop ] 2dip length > "end > sequence" slice-error ]
242 [ drop > "start > end" slice-error ]
245 : <slice> ( from to seq -- slice )
246 dup slice? [ collapse-slice ] when
250 M: slice virtual-seq seq>> ;
252 M: slice virtual@ [ from>> + ] [ seq>> ] bi ;
254 M: slice length [ to>> ] [ from>> ] bi - ;
256 : short ( seq n -- seq n' ) over length min ; inline
258 : head-slice ( seq n -- slice ) (head) <slice> ; inline
260 : tail-slice ( seq n -- slice ) (tail) <slice> ; inline
262 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
264 : head-slice* ( seq n -- slice ) from-end head-slice ; inline
266 : tail-slice* ( seq n -- slice ) from-end tail-slice ; inline
268 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
270 INSTANCE: slice virtual-sequence
272 ! One element repeated many times
273 TUPLE: repetition { len read-only } { elt read-only } ;
275 C: <repetition> repetition
277 M: repetition length len>> ;
278 M: repetition nth-unsafe nip elt>> ;
280 INSTANCE: repetition immutable-sequence
284 : check-length ( n -- n )
286 dup integer? [ "length not an integer" throw ] unless ; inline
288 : ((copy)) ( dst i src j n -- dst i src j n )
290 + swap nth-unsafe -roll [
291 + swap set-nth-unsafe
295 : (copy) ( dst i src j n -- dst )
296 dup 0 <= [ 2drop 2drop ] [ 1 - ((copy)) (copy) ] if ;
299 : prepare-subseq ( from to seq -- dst i src j n )
300 #! The check-length call forces partial dispatch
301 [ [ swap - ] dip new-sequence dup 0 ] 3keep
302 -rot drop roll length check-length ; inline
304 : check-copy ( src n dst -- )
305 over 0 < [ bounds-error ] when
306 [ swap length + ] dip lengthen ; inline
310 : subseq ( from to seq -- subseq )
311 [ check-slice prepare-subseq (copy) ] keep like ;
313 : head ( seq n -- headseq ) (head) subseq ;
315 : tail ( seq n -- tailseq ) (tail) subseq ;
317 : rest ( seq -- tailseq ) 1 tail ;
319 : head* ( seq n -- headseq ) from-end head ;
321 : tail* ( seq n -- tailseq ) from-end tail ;
323 : but-last ( seq -- headseq ) 1 head* ;
325 : copy ( src i dst -- )
326 #! The check-length call forces partial dispatch
327 pick length check-length [ 3dup check-copy spin 0 ] dip
330 M: sequence clone-like
331 [ dup length ] dip new-sequence [ 0 swap copy ] keep ;
333 M: immutable-sequence clone-like like ;
335 : push-all ( src dest -- ) [ length ] [ copy ] bi ;
339 : (append) ( seq1 seq2 accum -- accum )
340 [ [ over length ] dip copy ]
346 : append-as ( seq1 seq2 exemplar -- newseq )
347 [ over length over length + ] dip
348 [ (append) ] new-like ; inline
350 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
351 [ 3dup [ length ] tri@ + + ] dip [
352 [ [ 2over [ length ] bi@ + ] dip copy ]
356 : append ( seq1 seq2 -- newseq ) over append-as ;
358 : prepend ( seq1 seq2 -- newseq ) swap append ; inline
360 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
362 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
364 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
366 : change-nth ( i seq quot -- )
367 [ [ nth ] dip call ] 3keep drop set-nth ; inline
369 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
371 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
375 : ((each)) ( seq -- n quot )
376 [ length ] keep [ nth-unsafe ] curry ; inline
378 : (each) ( seq quot -- n quot' )
379 [ ((each)) ] dip compose ; inline
381 : (each-index) ( seq quot -- n quot' )
382 [ ((each)) [ keep ] curry ] dip compose ; inline
384 : (collect) ( quot into -- quot' )
385 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
387 : collect ( n quot into -- )
388 (collect) each-integer ; inline
390 : map-into ( seq quot into -- )
391 [ (each) ] dip collect ; inline
393 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
394 [ nth-unsafe ] bi-curry@ bi ; inline
396 : (2each) ( seq1 seq2 quot -- n quot' )
399 [ 2nth-unsafe ] 2curry
400 ] dip compose ; inline
402 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
403 [ nth-unsafe ] tri-curry@ tri ; inline
405 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
407 [ [ length ] tri@ min min ]
408 [ [ 3nth-unsafe ] 3curry ] 3bi
409 ] dip compose ; inline
411 : finish-find ( i seq -- i elt )
412 over [ dupd nth-unsafe ] [ drop f ] if ; inline
414 : (find) ( seq quot quot' -- i elt )
415 pick [ [ (each) ] dip call ] dip finish-find ; inline
417 : (find-from) ( n seq quot quot' -- i elt )
418 [ 2dup bounds-check? ] 2dip
425 : each ( seq quot -- )
426 (each) each-integer ; inline
428 : reduce ( seq identity quot -- result )
431 : map-integers ( len quot exemplar -- newseq )
432 [ over ] dip [ [ collect ] keep ] new-like ; inline
434 : map-as ( seq quot exemplar -- newseq )
435 [ (each) ] dip map-integers ; inline
437 : map ( seq quot -- newseq )
440 : replicate ( seq quot -- newseq )
441 [ drop ] prepose map ; inline
443 : replicate-as ( seq quot exemplar -- newseq )
444 [ [ drop ] prepose ] dip map-as ; inline
446 : change-each ( seq quot -- )
447 over map-into ; inline
449 : accumulate ( seq identity quot -- final newseq )
450 swapd [ [ call ] [ 2drop ] 3bi ] curry { } map-as ; inline
452 : 2each ( seq1 seq2 quot -- )
453 (2each) each-integer ; inline
455 : 2reverse-each ( seq1 seq2 quot -- )
456 [ [ <reversed> ] bi@ ] dip 2each ; inline
458 : 2reduce ( seq1 seq2 identity quot -- result )
459 [ -rot ] dip 2each ; inline
461 : 2map-as ( seq1 seq2 quot exemplar -- newseq )
462 [ (2each) ] dip map-integers ; inline
464 : 2map ( seq1 seq2 quot -- newseq )
465 pick 2map-as ; inline
467 : 2all? ( seq1 seq2 quot -- ? )
468 (2each) all-integers? ; inline
470 : 3each ( seq1 seq2 seq3 quot -- )
471 (3each) each ; inline
473 : 3map-as ( seq1 seq2 seq3 quot exemplar -- newseq )
474 [ (3each) ] dip map-integers ; inline
476 : 3map ( seq1 seq2 seq3 quot -- newseq )
477 [ pick ] dip swap 3map-as ; inline
479 : find-from ( n seq quot -- i elt )
480 [ (find-integer) ] (find-from) ; inline
482 : find ( seq quot -- i elt )
483 [ find-integer ] (find) ; inline
485 : find-last-from ( n seq quot -- i elt )
486 [ nip find-last-integer ] (find-from) ; inline
488 : find-last ( seq quot -- i elt )
489 [ [ 1 - ] dip find-last-integer ] (find) ; inline
491 : all? ( seq quot -- ? )
492 (each) all-integers? ; inline
494 : push-if ( elt quot accum -- )
495 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
497 : pusher ( quot -- quot accum )
498 V{ } clone [ [ push-if ] 2curry ] keep ; inline
500 : filter ( seq quot -- subseq )
501 over [ pusher [ each ] dip ] dip like ; inline
503 : push-either ( elt quot accum1 accum2 -- )
504 [ keep swap ] 2dip ? push ; inline
506 : 2pusher ( quot -- quot accum1 accum2 )
507 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
509 : partition ( seq quot -- trueseq falseseq )
510 over [ 2pusher [ each ] 2dip ] dip [ like ] curry bi@ ; inline
512 : accumulator ( quot -- quot' vec )
513 V{ } clone [ [ push ] curry compose ] keep ; inline
515 : produce-as ( pred quot exemplar -- seq )
516 [ accumulator [ while ] dip ] dip like ; inline
518 : produce ( pred quot -- seq )
519 { } produce-as ; inline
521 : follow ( obj quot -- seq )
522 [ dup ] swap [ keep ] curry produce nip ; inline
524 : each-index ( seq quot -- )
525 (each-index) each-integer ; inline
527 : interleave ( seq between quot -- )
528 pick empty? [ 3drop ] [
529 [ [ drop first-unsafe ] dip call ]
530 [ [ rest-slice ] 2dip [ bi* ] 2curry each ]
534 : map-index ( seq quot -- newseq )
535 [ dup length iota ] dip 2map ; inline
537 : reduce-index ( seq identity quot -- )
538 swapd each-index ; inline
540 : index ( obj seq -- n )
541 [ = ] with find drop ;
543 : index-from ( obj i seq -- n )
544 rot [ = ] curry find-from drop ;
546 : last-index ( obj seq -- n )
547 [ = ] with find-last drop ;
549 : last-index-from ( obj i seq -- n )
550 rot [ = ] curry find-last-from drop ;
552 : (indices) ( elt i obj accum -- )
553 [ swap [ = ] dip ] dip [ push ] 2curry when ; inline
555 : indices ( obj seq -- indices )
557 [ [ (indices) ] 2curry each-index ] keep ;
559 : nths ( indices seq -- seq' )
562 : any? ( seq quot -- ? )
563 find drop >boolean ; inline
565 : member? ( elt seq -- ? )
568 : memq? ( elt seq -- ? )
571 : remove ( elt seq -- newseq )
572 [ = not ] with filter ;
574 : remq ( elt seq -- newseq )
575 [ eq? not ] with filter ;
577 : sift ( seq -- newseq )
580 : harvest ( seq -- newseq )
581 [ empty? not ] filter ;
583 : mismatch ( seq1 seq2 -- i )
584 [ min-length iota ] 2keep
585 [ 2nth-unsafe = not ] 2curry
590 [ -rot 2nth-unsafe <=> ] [ [ length ] compare ] if* ;
592 : sequence= ( seq1 seq2 -- ? )
593 2dup [ length ] bi@ =
594 [ mismatch not ] [ 2drop f ] if ; inline
596 ERROR: assert-sequence got expected ;
598 : assert-sequence= ( a b -- )
599 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
601 : sequence-hashcode-step ( oldhash newpart -- newhash )
603 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
604 fixnum+fast fixnum+fast
605 ] keep fixnum-bitxor ; inline
607 : sequence-hashcode ( n seq -- x )
608 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
610 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
612 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
614 : move ( to from seq -- )
616 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
620 : (filter-here) ( quot: ( elt -- ? ) store scan seq -- )
623 [ nth-unsafe pick call [ 1 + ] when ] 2keep
626 ] [ nip set-length drop ] if ; inline recursive
630 : filter-here ( seq quot -- )
631 swap [ 0 0 ] dip (filter-here) ; inline
633 : delete ( elt seq -- )
634 [ = not ] with filter-here ;
636 : delq ( elt seq -- )
637 [ eq? not ] with filter-here ;
639 : prefix ( seq elt -- newseq )
640 over [ over length 1 + ] dip [
641 [ 0 swap set-nth-unsafe ] keep
645 : suffix ( seq elt -- newseq )
646 over [ over length 1 + ] dip [
647 [ [ over length ] dip set-nth-unsafe ] keep
651 : last ( seq -- elt ) [ length 1 - ] [ nth ] bi ;
653 : set-last ( elt seq -- ) [ length 1 - ] keep set-nth ;
655 : pop* ( seq -- ) [ length 1 - ] [ shorten ] bi ;
659 : move-backward ( shift from to seq -- )
663 [ [ 2over + pick ] dip move [ 1 + ] dip ] keep
667 : move-forward ( shift from to seq -- )
671 [ [ pick [ dup dup ] dip + swap ] dip move 1 - ] keep
675 : (open-slice) ( shift from to seq ? -- )
677 [ [ 1 - ] bi@ ] dip move-forward
679 [ over - ] 2dip move-backward
682 : open-slice ( shift from seq -- )
686 pick over length + over
687 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
693 : delete-slice ( from to seq -- )
694 check-slice [ over [ - ] dip ] dip open-slice ;
696 : delete-nth ( n seq -- )
697 [ dup 1 + ] dip delete-slice ;
699 : snip ( from to seq -- head tail )
700 [ swap head ] [ swap tail ] bi-curry bi* ; inline
702 : snip-slice ( from to seq -- head tail )
703 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
705 : replace-slice ( new from to seq -- seq' )
706 snip-slice surround ;
708 : remove-nth ( n seq -- seq' )
709 [ [ { } ] dip dup 1 + ] dip replace-slice ;
712 [ length 1 - ] [ [ nth ] [ shorten ] 2bi ] bi ;
714 : exchange ( m n seq -- )
715 [ nip bounds-check 2drop ]
716 [ bounds-check 3drop ]
720 : reverse-here ( seq -- )
721 [ length 2/ iota ] [ length ] [ ] tri
722 [ [ over - 1 - ] dip exchange-unsafe ] 2curry each ;
724 : reverse ( seq -- newseq )
726 dup [ length ] keep new-sequence
728 [ reverse-here ] keep
731 : sum-lengths ( seq -- n )
732 0 [ length + ] reduce ;
734 : concat-as ( seq exemplar -- newseq )
736 [ sum-lengths over new-resizable ] keep
737 [ over push-all ] each
738 ] if-empty swap like ;
740 : concat ( seq -- newseq )
741 [ { } ] [ dup first concat-as ] if-empty ;
745 : joined-length ( seq glue -- n )
746 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
750 : join ( seq glue -- newseq )
751 dup empty? [ concat-as ] [
753 2dup joined-length over new-resizable [
754 [ [ push-all ] 2curry ] [ [ nip push-all ] 2curry ] 2bi
760 : padding ( seq n elt quot -- newseq )
762 [ over length [-] dup 0 = [ drop ] ] dip
763 [ <repetition> ] curry
764 ] dip compose if ; inline
766 : pad-head ( seq n elt -- padded )
767 [ swap dup append-as ] padding ;
769 : pad-tail ( seq n elt -- padded )
772 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ;
774 : head? ( seq begin -- ? )
778 [ nip ] [ length head-slice ] 2bi sequence=
781 : tail? ( seq end -- ? )
785 [ nip ] [ length tail-slice* ] 2bi sequence=
788 : cut-slice ( seq n -- before-slice after-slice )
789 [ head-slice ] [ tail-slice ] 2bi ;
791 : insert-nth ( elt n seq -- seq' )
792 swap cut-slice [ swap suffix ] dip append ;
794 : midpoint@ ( seq -- n ) length 2/ ; inline
796 : halves ( seq -- first-slice second-slice )
797 dup midpoint@ cut-slice ;
799 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
800 #! We can't use case here since combinators depends on
802 pick length dup 0 3 between? [
806 [ [ drop first2 ] dip call ]
807 [ [ drop first3 ] dip bi@ ]
812 [ [ binary-reduce ] 2curry bi@ ] keep
814 ] if ; inline recursive
816 : cut ( seq n -- before after )
817 [ head ] [ tail ] 2bi ;
819 : cut* ( seq n -- before after )
820 [ head* ] [ tail* ] 2bi ;
824 : (start) ( subseq seq n -- subseq seq ? )
826 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
831 : start* ( subseq seq n -- i )
832 pick length pick length swap - 1 + iota
833 [ (start) ] find-from
836 : start ( subseq seq -- i ) 0 start* ; inline
838 : subseq? ( subseq seq -- ? ) start >boolean ;
840 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
841 2dup mismatch [ 2dup min-length ] unless*
842 [ tail-slice ] curry bi@ ;
844 : unclip ( seq -- rest first )
845 [ rest ] [ first-unsafe ] bi ;
847 : unclip-last ( seq -- butlast last )
848 [ but-last ] [ last ] bi ;
850 : unclip-slice ( seq -- rest-slice first )
851 [ rest-slice ] [ first-unsafe ] bi ; inline
853 : 2unclip-slice ( seq1 seq2 -- rest-slice1 rest-slice2 first1 first2 )
854 [ unclip-slice ] bi@ swapd ; inline
856 : map-reduce ( seq map-quot reduce-quot -- result )
857 [ [ unclip-slice ] dip [ call ] keep ] dip
858 compose reduce ; inline
860 : 2map-reduce ( seq1 seq2 map-quot reduce-quot -- result )
861 [ [ 2unclip-slice ] dip [ call ] keep ] dip
862 compose 2reduce ; inline
866 : (map-find) ( seq quot find-quot -- result elt )
867 [ [ f ] 2dip [ [ nip ] dip call dup ] curry ] dip call
868 [ [ drop f ] unless ] dip ; inline
872 : map-find ( seq quot -- result elt )
873 [ find ] (map-find) ; inline
875 : map-find-last ( seq quot -- result elt )
876 [ find-last ] (map-find) ; inline
878 : unclip-last-slice ( seq -- butlast-slice last )
879 [ but-last-slice ] [ last ] bi ; inline
881 : <flat-slice> ( seq -- slice )
882 dup slice? [ { } like ] when
883 [ drop 0 ] [ length ] [ ] tri <slice> ;
888 : (trim-head) ( seq quot -- seq n )
889 over [ [ not ] compose find drop ] dip
890 [ length or ] keep swap ; inline
892 : (trim-tail) ( seq quot -- seq n )
893 over [ [ not ] compose find-last drop ?1+ ] dip
898 : trim-head-slice ( seq quot -- slice )
899 (trim-head) tail-slice ; inline
901 : trim-head ( seq quot -- newseq )
902 (trim-head) tail ; inline
904 : trim-tail-slice ( seq quot -- slice )
905 (trim-tail) head-slice ; inline
907 : trim-tail ( seq quot -- newseq )
908 (trim-tail) head ; inline
910 : trim-slice ( seq quot -- slice )
911 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
913 : trim ( seq quot -- newseq )
914 [ trim-slice ] [ drop ] 2bi like ; inline
916 : sum ( seq -- n ) 0 [ + ] binary-reduce ;
918 : product ( seq -- n ) 1 [ * ] binary-reduce ;
920 : infimum ( seq -- n ) [ ] [ min ] map-reduce ;
922 : supremum ( seq -- n ) [ ] [ max ] map-reduce ;
924 : sigma ( seq quot -- n )
925 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
927 : count ( seq quot -- n ) [ 1 0 ? ] compose sigma ; inline
929 ! We hand-optimize flip to such a degree because type hints
930 ! cannot express that an array is an array of arrays yet, and
931 ! this word happens to be performance-critical since the compiler
932 ! itself uses it. Optimizing it like this reduced compile time.
935 : generic-flip ( matrix -- newmatrix )
936 [ dup first length [ length min ] reduce ] keep
937 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
941 : array-length ( array -- len )
942 { array } declare length>> ; inline
944 : array-flip ( matrix -- newmatrix )
946 [ dup first array-length [ array-length min ] reduce ] keep
947 [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
951 : flip ( matrix -- newmatrix )
955 [ array-flip ] [ generic-flip ] if
956 ] [ generic-flip ] if