1 ! Copyright (C) 2005, 2010 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 ; inline
23 GENERIC: lengthen ( n seq -- )
24 GENERIC: shorten ( n seq -- )
26 M: sequence lengthen 2dup length > [ set-length ] [ 2drop ] if ; inline
28 M: sequence shorten 2dup length < [ set-length ] [ 2drop ] if ; inline
30 : empty? ( seq -- ? ) length 0 = ; inline
32 : if-empty ( ..a seq quot1: ( ..a -- ..b ) quot2: ( ..a seq -- ..b ) -- ..b )
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 -- )
85 M: sequence nth bounds-check nth-unsafe ; inline
86 M: sequence set-nth bounds-check set-nth-unsafe ; inline
88 M: sequence nth-unsafe nth ; inline
89 M: sequence set-nth-unsafe set-nth ; inline
91 : change-nth-unsafe ( i seq quot -- )
92 [ [ nth-unsafe ] dip call ] 3keep drop set-nth-unsafe ; inline
96 ! The f object supports the sequence protocol trivially
97 M: f length drop 0 ; inline
98 M: f nth-unsafe nip ; inline
99 M: f like drop [ f ] when-empty ; inline
101 INSTANCE: f immutable-sequence
104 TUPLE: iota { n integer read-only } ;
106 : iota ( n -- iota ) \ iota boa ; inline
108 M: iota length n>> ; inline
109 M: iota nth-unsafe drop ; inline
111 INSTANCE: iota immutable-sequence
115 : first-unsafe ( seq -- first )
116 0 swap nth-unsafe ; inline
118 : first2-unsafe ( seq -- first second )
119 [ first-unsafe ] [ 1 swap nth-unsafe ] bi ; inline
121 : first3-unsafe ( seq -- first second third )
122 [ first2-unsafe ] [ 2 swap nth-unsafe ] bi ; inline
124 : first4-unsafe ( seq -- first second third fourth )
125 [ first3-unsafe ] [ 3 swap nth-unsafe ] bi ; inline
127 : exchange-unsafe ( m n seq -- )
128 [ [ nth-unsafe ] curry bi@ ]
129 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
131 : (head) ( seq n -- from to seq ) [ 0 ] 2dip swap ; inline
133 : (tail) ( seq n -- from to seq ) swap [ length ] keep ; inline
135 : from-end ( seq n -- seq n' ) [ dup length ] dip - ; inline
137 : (1sequence) ( obj seq -- seq )
138 [ 0 swap set-nth-unsafe ] keep ; inline
140 : (2sequence) ( obj1 obj2 seq -- seq )
141 [ 1 swap set-nth-unsafe ] keep
144 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
145 [ 2 swap set-nth-unsafe ] keep
148 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
149 [ 3 swap set-nth-unsafe ] keep
154 : 1sequence ( obj exemplar -- seq )
155 1 swap [ (1sequence) ] new-like ; inline
157 : 2sequence ( obj1 obj2 exemplar -- seq )
158 2 swap [ (2sequence) ] new-like ; inline
160 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
161 3 swap [ (3sequence) ] new-like ; inline
163 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
164 4 swap [ (4sequence) ] new-like ; inline
166 : first2 ( seq -- first second )
167 1 swap bounds-check nip first2-unsafe ; inline
169 : first3 ( seq -- first second third )
170 2 swap bounds-check nip first3-unsafe ; inline
172 : first4 ( seq -- first second third fourth )
173 3 swap bounds-check nip first4-unsafe ; inline
175 : ?nth ( n seq -- elt/f )
176 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
178 MIXIN: virtual-sequence
179 GENERIC: virtual-exemplar ( seq -- seq' )
180 GENERIC: virtual@ ( n seq -- n' seq' )
182 M: virtual-sequence nth virtual@ nth ; inline
183 M: virtual-sequence set-nth virtual@ set-nth ; inline
184 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
185 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
186 M: virtual-sequence like virtual-exemplar like ; inline
187 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
189 INSTANCE: virtual-sequence sequence
191 ! A reversal of an underlying sequence.
192 TUPLE: reversed { seq read-only } ;
194 C: <reversed> reversed
196 M: reversed virtual-exemplar seq>> ; inline
197 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
198 M: reversed length seq>> length ; inline
200 INSTANCE: reversed virtual-sequence
202 ! A slice of another sequence.
208 : collapse-slice ( m n slice -- m' n' seq )
209 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
211 TUPLE: slice-error from to seq reason ;
213 : slice-error ( from to seq ? string -- from to seq )
214 [ \ slice-error boa throw ] curry when ; inline
216 : check-slice ( from to seq -- from to seq )
218 [ 2drop 0 < "start < 0" slice-error ]
219 [ [ drop ] 2dip length > "end > sequence" slice-error ]
220 [ drop > "start > end" slice-error ]
223 : <slice> ( from to seq -- slice )
225 dup slice? [ collapse-slice ] when
228 M: slice virtual-exemplar seq>> ; inline
230 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
232 M: slice length [ to>> ] [ from>> ] bi - ; inline
234 : short ( seq n -- seq n' ) over length min ; inline
236 : head-slice ( seq n -- slice ) (head) <slice> ; inline
238 : tail-slice ( seq n -- slice ) (tail) <slice> ; inline
240 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
242 : head-slice* ( seq n -- slice ) from-end head-slice ; inline
244 : tail-slice* ( seq n -- slice ) from-end tail-slice ; inline
246 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
248 INSTANCE: slice virtual-sequence
250 ! One element repeated many times
251 TUPLE: repetition { len read-only } { elt read-only } ;
253 C: <repetition> repetition
255 M: repetition length len>> ; inline
256 M: repetition nth-unsafe nip elt>> ; inline
258 INSTANCE: repetition immutable-sequence
262 ERROR: integer-length-expected obj ;
264 : check-length ( n -- n )
265 dup integer? [ integer-length-expected ] unless ; inline
275 : ((copy)) ( n copy -- )
276 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
277 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
279 : (copy) ( n copy -- dst )
280 over 0 <= [ nip dst>> ] [ [ 1 - ] dip [ ((copy)) ] [ (copy) ] 2bi ] if ;
283 : subseq>copy ( from to seq -- n copy )
284 [ over - check-length swap ] dip
285 3dup nip new-sequence 0 swap <copy> ; inline
287 : check-copy ( src n dst -- src n dst )
288 3dup over 0 < [ bounds-error ] when
289 [ swap length + ] dip lengthen ; inline
293 : subseq ( from to seq -- subseq )
294 [ check-slice subseq>copy (copy) ] keep like ;
296 : head ( seq n -- headseq ) (head) subseq ;
298 : tail ( seq n -- tailseq ) (tail) subseq ;
300 : rest ( seq -- tailseq ) 1 tail ;
302 : head* ( seq n -- headseq ) from-end head ;
304 : tail* ( seq n -- tailseq ) from-end tail ;
306 : but-last ( seq -- headseq ) 1 head* ;
308 : copy ( src i dst -- )
309 #! The check-length call forces partial dispatch
310 [ [ length check-length 0 ] keep ] 2dip
311 check-copy <copy> (copy) drop ; inline
313 M: sequence clone-like
314 [ dup length ] dip new-sequence [ 0 swap copy ] keep ; inline
316 M: immutable-sequence clone-like like ; inline
318 : push-all ( src dest -- ) [ length ] [ copy ] bi ;
322 : (append) ( seq1 seq2 accum -- accum )
323 [ [ over length ] dip copy ]
329 : append-as ( seq1 seq2 exemplar -- newseq )
330 [ over length over length + ] dip
331 [ (append) ] new-like ; inline
333 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
334 [ 3dup [ length ] tri@ + + ] dip [
335 [ [ 2over [ length ] bi@ + ] dip copy ]
339 : append ( seq1 seq2 -- newseq ) over append-as ;
341 : prepend ( seq1 seq2 -- newseq ) swap append ; inline
343 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
345 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
347 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
349 : change-nth ( i seq quot -- )
350 [ [ nth ] dip call ] 3keep drop set-nth ; inline
352 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
354 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
358 : ((each)) ( seq -- n quot )
359 [ length ] keep [ nth-unsafe ] curry ; inline
361 : (each) ( seq quot -- n quot' )
362 [ ((each)) ] dip compose ; inline
364 : (each-index) ( seq quot -- n quot' )
365 [ ((each)) [ keep ] curry ] dip compose ; inline
367 : (collect) ( quot into -- quot' )
368 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
370 : collect ( n quot into -- )
371 (collect) each-integer ; inline
373 : map-into ( seq quot into -- )
374 [ (each) ] dip collect ; inline
376 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
377 [ nth-unsafe ] bi-curry@ bi ; inline
379 : (2each) ( seq1 seq2 quot -- n quot' )
382 [ 2nth-unsafe ] 2curry
383 ] dip compose ; inline
385 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
386 [ nth-unsafe ] tri-curry@ tri ; inline
388 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
390 [ [ length ] tri@ min min ]
391 [ [ 3nth-unsafe ] 3curry ] 3bi
392 ] dip compose ; inline
394 : finish-find ( i seq -- i elt )
395 over [ dupd nth-unsafe ] [ drop f ] if ; inline
397 : (find) ( seq quot quot' -- i elt )
398 pick [ [ (each) ] dip call ] dip finish-find ; inline
400 : (find-from) ( n seq quot quot' -- i elt )
401 [ 2dup bounds-check? ] 2dip
406 : (accumulate) ( seq identity quot -- seq identity quot )
407 [ swap ] dip [ curry keep ] curry ; inline
411 : each ( ... seq quot: ( ... x -- ... ) -- ... )
412 (each) each-integer ; inline
414 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
417 : map-integers ( len quot exemplar -- newseq )
418 [ over ] dip [ [ collect ] keep ] new-like ; inline
420 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
421 [ (each) ] dip map-integers ; inline
423 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
426 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
427 [ [ drop ] prepose ] dip map-integers ; inline
429 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
430 { } replicate-as ; inline
432 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
433 over [ map-into ] keep ; inline
435 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
436 [ (accumulate) ] dip map-as ; inline
438 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
439 pick accumulate-as ; inline
441 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
442 (accumulate) map! ; inline
444 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
445 (2each) each-integer ; inline
447 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
448 [ -rot ] dip 2each ; inline
450 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
451 [ (2each) ] dip map-integers ; inline
453 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
454 pick 2map-as ; inline
456 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
457 (2each) all-integers? ; inline
459 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
460 (3each) each-integer ; inline
462 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
463 [ (3each) ] dip map-integers ; inline
465 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
466 [ pick ] dip swap 3map-as ; inline
468 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
469 [ (find-integer) ] (find-from) ; inline
471 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
472 [ find-integer ] (find) ; inline
474 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
475 [ nip find-last-integer ] (find-from) ; inline
477 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
478 [ [ 1 - ] dip find-last-integer ] (find) ; inline
480 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
481 (each) all-integers? ; inline
483 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
484 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
486 : selector-for ( quot exemplar -- selector accum )
487 [ length ] keep new-resizable [ [ push-if ] 2curry ] keep ; inline
489 : selector ( quot -- selector accum )
490 V{ } selector-for ; inline
492 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
493 dup [ selector-for [ each ] dip ] curry dip like ; inline
495 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
496 over filter-as ; inline
498 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
499 [ keep swap ] 2dip ? push ; inline
501 : 2selector ( quot -- selector accum1 accum2 )
502 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
504 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
505 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
507 : collector-for ( quot exemplar -- quot' vec )
508 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
510 : collector ( quot -- quot' vec )
511 V{ } collector-for ; inline
513 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
514 dup [ collector-for [ while ] dip ] curry dip like ; inline
516 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
517 { } produce-as ; inline
519 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
520 [ dup ] swap [ keep ] curry produce nip ; inline
522 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
523 (each-index) each-integer ; inline
525 : interleave ( seq between quot -- )
526 pick empty? [ 3drop ] [
527 [ [ drop first-unsafe ] dip call ]
528 [ [ rest-slice ] 2dip [ bi* ] 2curry each ]
532 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
533 [ dup length iota ] dip 2map ; inline
535 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
536 swapd each-index ; inline
538 : index ( obj seq -- n )
539 [ = ] with find drop ;
541 : index-from ( obj i seq -- n )
542 rot [ = ] curry find-from drop ;
544 : last-index ( obj seq -- n )
545 [ = ] with find-last drop ;
547 : last-index-from ( obj i seq -- n )
548 rot [ = ] curry find-last-from drop ;
552 : (indices) ( elt i obj accum -- )
553 [ swap [ = ] dip ] dip [ push ] 2curry when ; inline
557 : indices ( obj seq -- indices )
559 [ [ (indices) ] 2curry each-index ] keep ;
561 : nths ( indices seq -- seq' )
564 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
565 find drop >boolean ; inline
567 : member? ( elt seq -- ? )
570 : member-eq? ( elt seq -- ? )
573 : remove ( elt seq -- newseq )
574 [ = not ] with filter ;
576 : remove-eq ( elt seq -- newseq )
577 [ eq? not ] with filter ;
579 : sift ( seq -- newseq )
582 : harvest ( seq -- newseq )
583 [ empty? not ] filter ;
585 : mismatch ( seq1 seq2 -- i )
587 [ 2nth-unsafe = not ] 2curry
588 find-integer ; inline
591 [ mismatch ] 2keep pick
592 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
594 : sequence= ( seq1 seq2 -- ? )
595 2dup [ length ] bi@ =
596 [ mismatch not ] [ 2drop f ] if ; inline
598 ERROR: assert-sequence got expected ;
600 : assert-sequence= ( a b -- )
601 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
605 : sequence-hashcode-step ( oldhash newpart -- newhash )
607 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
608 fixnum+fast fixnum+fast
609 ] keep fixnum-bitxor ; inline
613 : sequence-hashcode ( n seq -- x )
614 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
616 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
618 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
620 : move ( to from seq -- )
622 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
626 : (filter!) ( ... quot: ( ... elt -- ... ? ) store scan seq -- ... )
629 [ nth-unsafe pick call [ 1 + ] when ] 2keep
632 ] [ nip set-length drop ] if ; inline recursive
636 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
637 swap [ [ 0 0 ] dip (filter!) ] keep ; inline
639 : remove! ( elt seq -- seq )
640 [ = not ] with filter! ;
642 : remove-eq! ( elt seq -- seq )
643 [ eq? not ] with filter! ;
645 : prefix ( seq elt -- newseq )
646 over [ over length 1 + ] dip [
647 [ 0 swap set-nth-unsafe ] keep
651 : suffix ( seq elt -- newseq )
652 over [ over length 1 + ] dip [
653 [ [ over length ] dip set-nth-unsafe ] keep
657 : suffix! ( seq elt -- seq ) over push ; inline
659 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
661 : last ( seq -- elt ) [ length 1 - ] [ nth ] bi ;
663 : set-last ( elt seq -- ) [ length 1 - ] keep set-nth ;
665 : pop* ( seq -- ) [ length 1 - ] [ shorten ] bi ;
669 : move-backward ( shift from to seq -- )
673 [ [ 2over + pick ] dip move [ 1 + ] dip ] keep
677 : move-forward ( shift from to seq -- )
681 [ [ pick [ dup dup ] dip + swap ] dip move 1 - ] keep
685 : (open-slice) ( shift from to seq ? -- )
687 [ [ 1 - ] bi@ ] dip move-forward
689 [ over - ] 2dip move-backward
692 : open-slice ( shift from seq -- )
696 pick over length + over
697 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
703 : delete-slice ( from to seq -- )
704 check-slice [ over [ - ] dip ] dip open-slice ;
706 : remove-nth! ( n seq -- seq )
707 [ [ dup 1 + ] dip delete-slice ] keep ;
709 : snip ( from to seq -- head tail )
710 [ swap head ] [ swap tail ] bi-curry bi* ; inline
712 : snip-slice ( from to seq -- head tail )
713 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
715 : replace-slice ( new from to seq -- seq' )
716 snip-slice surround ;
718 : remove-nth ( n seq -- seq' )
719 [ [ { } ] dip dup 1 + ] dip replace-slice ;
722 [ length 1 - ] [ [ nth ] [ shorten ] 2bi ] bi ;
724 : exchange ( m n seq -- )
725 [ nip bounds-check 2drop ]
726 [ bounds-check 3drop ]
730 : reverse! ( seq -- seq )
732 [ length 2/ iota ] [ length ] [ ] tri
733 [ [ over - 1 - ] dip exchange-unsafe ] 2curry each
736 : reverse ( seq -- newseq )
738 dup [ length ] keep new-sequence
739 [ 0 swap copy ] keep reverse!
742 : sum-lengths ( seq -- n )
743 0 [ length + ] reduce ;
745 : concat-as ( seq exemplar -- newseq )
747 [ sum-lengths over new-resizable ] keep
749 ] if-empty swap like ;
751 : concat ( seq -- newseq )
752 [ { } ] [ dup first concat-as ] if-empty ;
756 : joined-length ( seq glue -- n )
757 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
761 : join ( seq glue -- newseq )
762 dup empty? [ concat-as ] [
764 2dup joined-length over new-resizable [
765 [ [ push-all ] 2curry ] [ [ nip push-all ] 2curry ] 2bi
771 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
773 [ over length [-] dup 0 = [ drop ] ] dip
774 [ <repetition> ] curry
775 ] dip compose if ; inline
777 : pad-head ( seq n elt -- padded )
778 [ swap dup append-as ] padding ;
780 : pad-tail ( seq n elt -- padded )
783 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ;
785 : head? ( seq begin -- ? )
789 [ nip ] [ length head-slice ] 2bi sequence=
792 : tail? ( seq end -- ? )
796 [ nip ] [ length tail-slice* ] 2bi sequence=
799 : cut-slice ( seq n -- before-slice after-slice )
800 [ head-slice ] [ tail-slice ] 2bi ;
802 : insert-nth ( elt n seq -- seq' )
803 swap cut-slice [ swap suffix ] dip append ;
805 : midpoint@ ( seq -- n ) length 2/ ; inline
807 : halves ( seq -- first-slice second-slice )
808 dup midpoint@ cut-slice ;
810 : binary-reduce ( ... seq start quot: ( ... elt1 elt2 -- ... newelt ) -- ... value )
811 #! We can't use case here since combinators depends on
813 pick length dup 0 3 between? [
817 [ [ drop first2 ] dip call ]
818 [ [ drop first3 ] dip bi@ ]
823 [ [ binary-reduce ] 2curry bi@ ] keep
825 ] if ; inline recursive
827 : cut ( seq n -- before after )
828 [ head ] [ tail ] 2bi ;
830 : cut* ( seq n -- before after )
831 [ head* ] [ tail* ] 2bi ;
835 : (start) ( subseq seq n -- subseq seq ? )
837 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
840 : prepare-2map-reduce ( seq1 seq2 map-quot -- initial length seq1 seq2 )
841 [ drop min-length dup 1 < [ "Empty sequence" throw ] when 1 - ]
842 [ drop [ [ 1 + ] 2dip 2nth-unsafe ] 2curry ]
843 [ [ [ first-unsafe ] bi@ ] dip call ]
848 : start* ( subseq seq n -- i )
849 pick length pick length swap - 1 + iota
850 [ (start) ] find-from
853 : start ( subseq seq -- i ) 0 start* ; inline
855 : subseq? ( subseq seq -- ? ) start >boolean ;
857 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
858 2dup mismatch [ 2dup min-length ] unless*
859 [ tail-slice ] curry bi@ ;
861 : unclip ( seq -- rest first )
862 [ rest ] [ first-unsafe ] bi ;
864 : unclip-last ( seq -- butlast last )
865 [ but-last ] [ last ] bi ;
867 : unclip-slice ( seq -- rest-slice first )
868 [ rest-slice ] [ first-unsafe ] bi ; inline
870 : 2unclip-slice ( seq1 seq2 -- rest-slice1 rest-slice2 first1 first2 )
871 [ unclip-slice ] bi@ swapd ; inline
873 : map-reduce ( ..a seq map-quot: ( ..a x -- ..b elt ) reduce-quot: ( ..b prev elt -- ..a next ) -- ..a result )
874 [ [ unclip-slice ] dip [ call ] keep ] dip
875 compose reduce ; inline
877 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
878 [ [ prepare-2map-reduce ] keep ] dip
879 compose compose each-integer ; inline
883 : (map-find) ( seq quot find-quot -- result elt )
884 [ [ f ] 2dip [ [ nip ] dip call dup ] curry ] dip call
885 [ [ drop f ] unless ] dip ; inline
889 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
890 [ find ] (map-find) ; inline
892 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
893 [ find-last ] (map-find) ; inline
895 : unclip-last-slice ( seq -- butlast-slice last )
896 [ but-last-slice ] [ last ] bi ; inline
900 : (trim-head) ( seq quot -- seq n )
901 over [ [ not ] compose find drop ] dip
902 [ length or ] keep swap ; inline
904 : (trim-tail) ( seq quot -- seq n )
905 over [ [ not ] compose find-last drop ?1+ ] dip
910 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
911 (trim-head) tail-slice ; inline
913 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
914 (trim-head) tail ; inline
916 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
917 (trim-tail) head-slice ; inline
919 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
920 (trim-tail) head ; inline
922 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
923 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
925 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
926 [ trim-slice ] [ drop ] 2bi like ; inline
928 GENERIC: sum ( seq -- n )
929 M: object sum 0 [ + ] binary-reduce ; inline
931 : product ( seq -- n ) 1 [ * ] binary-reduce ;
933 : infimum ( seq -- n ) [ ] [ min ] map-reduce ;
935 : supremum ( seq -- n ) [ ] [ max ] map-reduce ;
937 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
938 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
940 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n ) [ 1 0 ? ] compose map-sum ; inline
942 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
943 [ with each ] 2curry each ; inline
945 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
946 [ with map ] 2curry map ; inline
948 : cartesian-product ( seq1 seq2 -- newseq )
949 [ { } 2sequence ] cartesian-map ;
951 ! We hand-optimize flip to such a degree because type hints
952 ! cannot express that an array is an array of arrays yet, and
953 ! this word happens to be performance-critical since the compiler
954 ! itself uses it. Optimizing it like this reduced compile time.
957 : generic-flip ( matrix -- newmatrix )
958 [ dup first length [ length min ] reduce iota ] keep
959 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
963 : array-length ( array -- len )
964 { array } declare length>> ; inline
966 : array-flip ( matrix -- newmatrix )
968 [ dup first array-length [ array-length min ] reduce iota ] keep
969 [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
973 : flip ( matrix -- newmatrix )
977 [ array-flip ] [ generic-flip ] if
978 ] [ generic-flip ] if