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-tuple { n integer read-only } ;
107 ERROR: non-negative-integer-expected n ;
110 dup 0 < [ non-negative-integer-expected ] when
111 \ iota-tuple boa ; inline
113 M: iota-tuple length n>> ; inline
114 M: iota-tuple nth-unsafe drop ; inline
116 INSTANCE: iota-tuple immutable-sequence
120 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
121 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
122 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
123 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
125 : first2-unsafe ( seq -- first second )
126 [ first-unsafe ] [ second-unsafe ] bi ; inline
128 : first3-unsafe ( seq -- first second third )
129 [ first2-unsafe ] [ third-unsafe ] bi ; inline
131 : first4-unsafe ( seq -- first second third fourth )
132 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
134 : exchange-unsafe ( m n seq -- )
135 [ [ nth-unsafe ] curry bi@ ]
136 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
138 : (head) ( seq n -- from to seq ) [ 0 ] 2dip swap ; inline
140 : (tail) ( seq n -- from to seq ) swap [ length ] keep ; inline
142 : from-end ( seq n -- seq n' ) [ dup length ] dip - ; inline
144 : (1sequence) ( obj seq -- seq )
145 [ 0 swap set-nth-unsafe ] keep ; inline
147 : (2sequence) ( obj1 obj2 seq -- seq )
148 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
150 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
151 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
153 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
154 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
158 : 1sequence ( obj exemplar -- seq )
159 1 swap [ (1sequence) ] new-like ; inline
161 : 2sequence ( obj1 obj2 exemplar -- seq )
162 2 swap [ (2sequence) ] new-like ; inline
164 : 3sequence ( obj1 obj2 obj3 exemplar -- seq )
165 3 swap [ (3sequence) ] new-like ; inline
167 : 4sequence ( obj1 obj2 obj3 obj4 exemplar -- seq )
168 4 swap [ (4sequence) ] new-like ; inline
170 : first2 ( seq -- first second )
171 1 swap bounds-check nip first2-unsafe ; inline
173 : first3 ( seq -- first second third )
174 2 swap bounds-check nip first3-unsafe ; inline
176 : first4 ( seq -- first second third fourth )
177 3 swap bounds-check nip first4-unsafe ; inline
179 : ?nth ( n seq -- elt/f )
180 2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline
182 : ?set-nth ( elt n seq -- )
183 2dup bounds-check? [ set-nth-unsafe ] [ 3drop ] if ; inline
185 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
186 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
187 : ?last ( seq -- elt/f )
188 [ length 1 - ] keep over 0 <
189 [ 2drop f ] [ nth-unsafe ] if ; inline
191 MIXIN: virtual-sequence
192 GENERIC: virtual-exemplar ( seq -- seq' )
193 GENERIC: virtual@ ( n seq -- n' seq' )
195 M: virtual-sequence nth virtual@ nth ; inline
196 M: virtual-sequence set-nth virtual@ set-nth ; inline
197 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
198 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
199 M: virtual-sequence like virtual-exemplar like ; inline
200 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
202 INSTANCE: virtual-sequence sequence
204 ! A reversal of an underlying sequence.
205 TUPLE: reversed { seq read-only } ;
207 C: <reversed> reversed
209 M: reversed virtual-exemplar seq>> ; inline
210 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
211 M: reversed length seq>> length ; inline
213 INSTANCE: reversed virtual-sequence
215 ! A slice of another sequence.
221 : collapse-slice ( m n slice -- m' n' seq )
222 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
224 ERROR: slice-error from to seq reason ;
226 : check-slice-error ( from to seq ? string -- from to seq )
227 [ slice-error ] curry when ; inline
229 : check-slice ( from to seq -- from to seq )
231 [ 2drop 0 < "start < 0" check-slice-error ]
232 [ [ drop ] 2dip length > "end > sequence" check-slice-error ]
233 [ drop > "start > end" check-slice-error ]
238 : <slice-unsafe> ( from to seq -- slice )
239 dup slice? [ collapse-slice ] when slice boa ; inline
243 : <slice> ( from to seq -- slice )
244 check-slice <slice-unsafe> ; inline
246 M: slice virtual-exemplar seq>> ; inline
248 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
250 M: slice length [ to>> ] [ from>> ] bi - ; inline
252 : short ( seq n -- seq n' ) over length min ; inline
254 : head-slice ( seq n -- slice ) (head) <slice> ; inline
256 : tail-slice ( seq n -- slice ) (tail) <slice> ; inline
258 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
260 : head-slice* ( seq n -- slice ) from-end head-slice ; inline
262 : tail-slice* ( seq n -- slice ) from-end tail-slice ; inline
264 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
266 INSTANCE: slice virtual-sequence
268 ! One element repeated many times
269 TUPLE: repetition { len read-only } { elt read-only } ;
271 C: <repetition> repetition
273 M: repetition length len>> ; inline
274 M: repetition nth-unsafe nip elt>> ; inline
276 INSTANCE: repetition immutable-sequence
280 ERROR: integer-length-expected obj ;
282 : check-length ( n -- n )
283 dup integer? [ integer-length-expected ] unless ; inline
293 : ((copy)) ( n copy -- )
294 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
295 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
297 : (copy) ( n copy -- dst )
298 over 0 <= [ nip dst>> ] [
299 [ 1 - ] dip [ ((copy)) ] [ (copy) ] 2bi
300 ] if ; inline recursive
302 : subseq>copy ( from to seq -- n copy )
303 [ over - check-length swap ] dip
304 3dup nip new-sequence 0 swap <copy> ; inline
306 : bounds-check-head ( n seq -- n seq )
307 over 0 < [ 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 #! The check-length call forces partial dispatch
315 [ [ length check-length 0 ] keep ] 2dip <copy> (copy) drop ; inline
319 : subseq ( from to seq -- subseq )
320 [ check-slice subseq>copy (copy) ] keep like ;
322 : head ( seq n -- headseq ) (head) subseq ;
324 : tail ( seq n -- tailseq ) (tail) subseq ;
326 : rest ( seq -- tailseq ) 1 tail ;
328 : head* ( seq n -- headseq ) from-end head ;
330 : tail* ( seq n -- tailseq ) from-end tail ;
332 : but-last ( seq -- headseq ) 1 head* ;
334 : copy ( src i dst -- )
335 check-copy copy-unsafe ; inline
337 M: sequence clone-like
338 [ dup length ] dip new-sequence [ 0 swap copy-unsafe ] keep ; inline
340 M: immutable-sequence clone-like like ; inline
342 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
346 : (append) ( seq1 seq2 accum -- accum )
347 [ [ over length ] dip copy-unsafe ]
348 [ 0 swap copy-unsafe ]
353 : append-as ( seq1 seq2 exemplar -- newseq )
354 [ 2dup [ length ] bi@ + ] dip
355 [ (append) ] new-like ; inline
357 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
358 [ 3dup [ length ] tri@ + + ] dip [
359 [ [ 2over [ length ] bi@ + ] dip copy-unsafe ]
363 : append ( seq1 seq2 -- newseq ) over append-as ;
365 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
367 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
369 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
371 : surround ( seq1 seq2 seq3 -- newseq ) swapd 3append ; inline
373 : glue ( seq1 seq2 seq3 -- newseq ) swap 3append ; inline
375 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
376 [ [ nth ] dip call ] 3keep drop set-nth-unsafe ; inline
378 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
380 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
384 : ((each)) ( seq -- n quot )
385 [ length ] keep [ nth-unsafe ] curry ; inline
387 : (each) ( seq quot -- n quot' )
388 [ ((each)) ] dip compose ; inline
390 : (each-index) ( seq quot -- n quot' )
391 [ ((each)) [ keep ] curry ] dip compose ; inline
393 : (collect) ( quot into -- quot' )
394 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
396 : collect ( n quot into -- )
397 (collect) each-integer ; inline
399 : map-into ( seq quot into -- )
400 [ (each) ] dip collect ; inline
402 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
403 [ nth-unsafe ] bi-curry@ bi ; inline
405 : ((2each)) ( seq1 seq2 -- n quot )
406 [ min-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
408 : (2each) ( seq1 seq2 quot -- n quot' )
409 [ ((2each)) ] dip compose ; inline
411 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
412 [ nth-unsafe ] tri-curry@ tri ; inline
414 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
416 [ [ length ] tri@ min min ]
417 [ [ 3nth-unsafe ] 3curry ] 3bi
418 ] dip compose ; inline
420 : finish-find ( i seq -- i elt )
421 over [ dupd nth-unsafe ] [ drop f ] if ; inline
423 : (find) ( seq quot quot' -- i elt )
424 pick [ [ (each) ] dip call ] dip finish-find ; inline
426 : (find-from) ( n seq quot quot' -- i elt )
427 [ 2dup bounds-check? ] 2dip
432 : (find-index) ( seq quot quot' -- i elt )
433 pick [ [ (each-index) ] dip call ] dip finish-find ; inline
435 : (find-index-from) ( n seq quot quot' -- i elt )
436 [ 2dup bounds-check? ] 2dip
437 [ (find-index) ] 2curry
441 : (accumulate) ( seq identity quot -- identity seq quot )
442 swapd [ curry keep ] curry ; inline
446 : each ( ... seq quot: ( ... x -- ... ) -- ... )
447 (each) each-integer ; inline
449 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
452 : map-integers ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
453 [ over ] dip [ [ collect ] keep ] new-like ; inline
455 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
456 [ (each) ] dip map-integers ; inline
458 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
461 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
462 [ [ drop ] prepose ] dip map-integers ; inline
464 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
465 { } replicate-as ; inline
467 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
468 over [ map-into ] keep ; inline
470 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
471 [ (accumulate) ] dip map-as ; inline
473 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
474 pick accumulate-as ; inline
476 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
477 (accumulate) map! ; inline
479 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
480 (2each) each-integer ; inline
482 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
483 [ -rot ] dip 2each ; inline
485 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
486 [ (2each) ] dip map-integers ; inline
488 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
489 pick 2map-as ; inline
491 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
492 (2each) all-integers? ; inline
494 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
495 (3each) each-integer ; inline
497 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
498 [ (3each) ] dip map-integers ; inline
500 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
501 [ pick ] dip swap 3map-as ; inline
503 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
504 [ (find-integer) ] (find-from) ; inline
506 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
507 [ find-integer ] (find) ; inline
509 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
510 [ nip find-last-integer ] (find-from) ; inline
512 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
513 [ [ 1 - ] dip find-last-integer ] (find) ; inline
515 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
516 [ (find-integer) ] (find-index-from) ; inline
518 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
519 [ find-integer ] (find-index) ; inline
521 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
522 (each) all-integers? ; inline
524 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
525 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
527 : selector-for ( quot exemplar -- selector accum )
528 [ length ] keep new-resizable [ [ push-if ] 2curry ] keep ; inline
530 : selector ( quot -- selector accum )
531 V{ } selector-for ; inline
533 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
534 dup [ selector-for [ each ] dip ] curry dip like ; inline
536 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
537 over filter-as ; inline
539 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
540 [ keep swap ] 2dip ? push ; inline
542 : 2selector ( quot -- selector accum1 accum2 )
543 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
545 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
546 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
548 : collector-for ( quot exemplar -- quot' vec )
549 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
551 : collector ( quot -- quot' vec )
552 V{ } collector-for ; inline
554 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
555 dup [ collector-for [ while ] dip ] curry dip like ; inline
557 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
558 { } produce-as ; inline
560 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
561 [ dup ] swap [ keep ] curry produce nip ; inline
563 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
564 (each-index) each-integer ; inline
566 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
567 pick empty? [ 3drop ] [
568 [ [ drop first-unsafe ] dip call ]
569 [ [ rest-slice ] 2dip [ bi* ] 2curry each ]
573 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
574 [ dup length iota ] dip 2map ; inline
576 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
577 swapd each-index ; inline
579 : index ( obj seq -- n )
580 [ = ] with find drop ;
582 : index-from ( obj i seq -- n )
583 rot [ = ] curry find-from drop ;
585 : last-index ( obj seq -- n )
586 [ = ] with find-last drop ;
588 : last-index-from ( obj i seq -- n )
589 rot [ = ] curry find-last-from drop ;
593 : (indices) ( elt i obj accum -- )
594 [ swap [ = ] dip ] dip [ push ] 2curry when ; inline
598 : indices ( obj seq -- indices )
600 [ [ (indices) ] 2curry each-index ] keep ;
604 : nths-unsafe ( indices seq -- seq' )
605 [ [ nth-unsafe ] curry ] keep map-as ;
609 : nths ( indices seq -- seq' )
610 [ [ nth ] curry ] keep map-as ;
612 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
613 find drop >boolean ; inline
615 : member? ( elt seq -- ? )
618 : member-eq? ( elt seq -- ? )
621 : remove ( elt seq -- newseq )
622 [ = not ] with filter ;
624 : remove-eq ( elt seq -- newseq )
625 [ eq? not ] with filter ;
627 : sift ( seq -- newseq )
630 : harvest ( seq -- newseq )
631 [ empty? not ] filter ;
635 : mismatch-unsafe ( n seq1 seq2 -- i )
636 [ 2nth-unsafe = not ] 2curry find-integer ; inline
640 : mismatch ( seq1 seq2 -- i )
641 [ min-length ] 2keep mismatch-unsafe ; inline
644 [ mismatch ] 2keep pick
645 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
647 : sequence= ( seq1 seq2 -- ? )
648 2dup [ length ] bi@ dupd =
649 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
651 ERROR: assert-sequence got expected ;
653 : assert-sequence= ( a b -- )
654 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
658 : sequence-hashcode-step ( oldhash newpart -- newhash )
659 integer>fixnum swap [
660 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
661 fixnum+fast fixnum+fast
662 ] keep fixnum-bitxor ; inline
666 : sequence-hashcode ( n seq -- x )
667 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
669 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
671 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
673 : move ( to from seq -- )
675 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
679 : move-unsafe ( to from seq -- )
681 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
683 : (filter!) ( ... quot: ( ... elt -- ... ? ) store scan seq -- ... )
685 [ move-unsafe ] 3keep
686 [ nth-unsafe pick call [ 1 + ] when ] 2keep
689 ] [ nip set-length drop ] if ; inline recursive
693 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
694 swap [ [ 0 0 ] dip (filter!) ] keep ; inline
696 : remove! ( elt seq -- seq )
697 [ = not ] with filter! ;
699 : remove-eq! ( elt seq -- seq )
700 [ eq? not ] with filter! ;
702 : prefix ( seq elt -- newseq )
703 over [ over length 1 + ] dip [
704 (1sequence) [ 1 swap copy-unsafe ] keep
707 : suffix ( seq elt -- newseq )
708 over [ over length 1 + ] dip [
709 [ [ over length ] dip set-nth-unsafe ] keep
710 [ 0 swap copy-unsafe ] keep
713 : suffix! ( seq elt -- seq ) over push ; inline
715 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
717 : last ( seq -- elt )
719 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
723 : last-unsafe ( seq -- elt )
724 [ length 1 - ] [ nth-unsafe ] bi ; inline
728 : set-last ( elt seq -- )
730 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
732 : pop* ( seq -- ) [ length 1 - ] [ shorten ] bi ;
736 : move-backward ( shift from to seq -- )
740 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
744 : move-forward ( shift from to seq -- )
748 [ [ pick [ dup dup ] dip + swap ] dip move-unsafe 1 - ] keep
752 : (open-slice) ( shift from to seq ? -- )
754 [ [ 1 - ] bi@ ] dip move-forward
756 [ over - ] 2dip move-backward
759 : open-slice ( shift from seq -- )
763 pick over length + over
764 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
770 : delete-slice ( from to seq -- )
771 check-slice [ over [ - ] dip ] dip open-slice ;
773 : remove-nth! ( n seq -- seq )
774 [ [ dup 1 + ] dip delete-slice ] keep ;
776 : snip ( from to seq -- head tail )
777 [ swap head ] [ swap tail ] bi-curry bi* ; inline
779 : snip-slice ( from to seq -- head tail )
780 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
782 : replace-slice ( new from to seq -- seq' )
783 snip-slice surround ;
785 : remove-nth ( n seq -- seq' )
786 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
789 [ length 1 - ] keep over 0 >=
790 [ [ nth-unsafe ] [ shorten ] 2bi ]
791 [ bounds-error ] if ;
793 : exchange ( m n seq -- )
794 [ nip bounds-check 2drop ]
795 [ bounds-check 3drop ]
799 : midpoint@ ( seq -- n ) length 2/ ; inline
801 : reverse! ( seq -- seq )
803 [ midpoint@ ] [ length ] [ ] tri
804 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
808 : reverse ( seq -- newseq )
810 dup [ length ] keep new-sequence
811 [ 0 swap copy-unsafe ] keep reverse!
814 : sum-lengths ( seq -- n )
815 0 [ length + ] reduce ;
817 : concat-as ( seq exemplar -- newseq )
819 [ sum-lengths over new-resizable ] keep
821 ] if-empty swap like ;
823 : concat ( seq -- newseq )
824 [ { } ] [ dup first concat-as ] if-empty ;
828 : joined-length ( seq glue -- n )
829 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
833 : join-as ( seq glue exemplar -- newseq )
834 over empty? [ nip concat-as ] [
836 2dup joined-length over new-resizable [
837 [ [ push-all ] 2curry ]
838 [ nip [ push-all ] curry ] 2bi
844 : join ( seq glue -- newseq )
847 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
849 [ over length [-] dup 0 = [ drop ] ] dip
850 [ <repetition> ] curry
851 ] dip compose if ; inline
853 : pad-head ( seq n elt -- padded )
854 [ swap dup append-as ] padding ;
856 : pad-tail ( seq n elt -- padded )
859 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ;
860 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ;
861 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
862 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
864 : head? ( seq begin -- ? )
868 [ nip ] [ length head-slice ] 2bi sequence=
871 : tail? ( seq end -- ? )
875 [ nip ] [ length tail-slice* ] 2bi sequence=
878 : cut-slice ( seq n -- before-slice after-slice )
879 [ head-slice ] [ tail-slice ] 2bi ; inline
881 : insert-nth ( elt n seq -- seq' )
882 swap cut-slice [ swap suffix ] dip append ;
884 : halves ( seq -- first-slice second-slice )
885 dup midpoint@ cut-slice ; inline
889 : nth2-unsafe ( n seq -- a b )
890 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
892 : nth3-unsafe ( n seq -- a b c )
893 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
895 : (binary-reduce) ( ... seq start quot: ( ... elt1 elt2 -- ... newelt ) from length -- ... value )
896 #! We can't use case here since combinators depends on
901 [ 2nip swap nth-unsafe ]
902 [ -rot [ drop swap nth2-unsafe ] dip call ]
903 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
906 [ 2/ ] [ over - ] bi [ 2dup + ] dip
907 [ (binary-reduce) ] [ 2curry ] curry 2bi@
908 pick [ 3bi ] dip call
909 ] if ; inline recursive
913 : binary-reduce ( ... seq start quot: ( ... elt1 elt2 -- ... newelt ) -- ... value )
914 pick length 0 max 0 swap (binary-reduce) ; inline
916 : cut ( seq n -- before after )
917 [ head ] [ tail ] 2bi ;
919 : cut* ( seq n -- before after )
920 [ head* ] [ tail* ] 2bi ;
924 : (start) ( subseq seq n length -- subseq seq ? )
926 [ 3dup ] dip [ + swap nth-unsafe ] keep rot nth-unsafe =
927 ] all-integers? nip ; inline
931 : start* ( subseq seq n -- i )
932 pick length [ pick length swap - 1 + ] keep
933 [ (start) ] curry (find-integer) 2nip ;
935 : start ( subseq seq -- i ) 0 start* ; inline
937 : subseq? ( subseq seq -- ? ) start >boolean ;
939 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
940 2dup mismatch [ 2dup min-length ] unless*
941 [ tail-slice ] curry bi@ ;
943 : unclip ( seq -- rest first )
944 [ rest ] [ first-unsafe ] bi ;
946 : unclip-last ( seq -- butlast last )
947 [ but-last ] [ last-unsafe ] bi ;
949 : unclip-slice ( seq -- rest-slice first )
950 [ rest-slice ] [ first-unsafe ] bi ; inline
952 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
953 [ [ dup first ] dip [ call ] keep ] dip compose
954 swapd [ 1 ] 2dip (each) (each-integer) ; inline
956 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..b intermediate ) reduce-quot: ( ..b prev intermediate -- ..a next ) -- ..a result )
957 [ [ 2dup [ first ] bi@ ] dip [ call ] keep ] dip compose
958 [ -rot ] dip [ 1 ] 3dip (2each) (each-integer) ; inline
962 : (map-find) ( seq quot find-quot -- result elt )
963 [ [ f ] 2dip [ [ nip ] dip call dup ] curry ] dip call
964 [ [ drop f ] unless ] dip ; inline
968 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
969 [ find ] (map-find) ; inline
971 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
972 [ find-last ] (map-find) ; inline
974 : unclip-last-slice ( seq -- butlast-slice last )
975 [ but-last-slice ] [ last-unsafe ] bi ; inline
979 : (trim-head) ( seq quot -- seq n )
980 over [ [ not ] compose find drop ] dip
981 [ length or ] keep swap ; inline
983 : (trim-tail) ( seq quot -- seq n )
984 over [ [ not ] compose find-last drop ?1+ ] dip
989 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
990 (trim-head) tail-slice ; inline
992 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
993 (trim-head) tail ; inline
995 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
996 (trim-tail) head-slice ; inline
998 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
999 (trim-tail) head ; inline
1001 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1002 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1004 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1005 [ trim-slice ] [ drop ] 2bi like ; inline
1007 GENERIC: sum ( seq -- n )
1008 M: object sum 0 [ + ] binary-reduce ; inline
1010 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1012 : infimum ( seq -- n ) [ ] [ min ] map-reduce ;
1014 : supremum ( seq -- n ) [ ] [ max ] map-reduce ;
1016 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1017 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1019 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1020 [ 1 0 ? ] compose map-sum ; inline
1022 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1023 [ with each ] 2curry each ; inline
1025 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1026 [ with map ] 2curry map ; inline
1028 : cartesian-product ( seq1 seq2 -- newseq )
1029 [ { } 2sequence ] cartesian-map ;
1031 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
1032 -rot (each) (each-integer) ; inline
1034 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1035 [ keep swap ] curry [ [ first ] dip call ] 2keep [
1036 curry 2dip pick over after?
1037 [ 2drop ] [ [ 2drop ] 2dip ] if
1038 ] curry 1 each-from drop ; inline
1040 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1041 [ keep swap ] curry [ [ first ] dip call ] 2keep [
1042 curry 2dip pick over before?
1043 [ 2drop ] [ [ 2drop ] 2dip ] if
1044 ] curry 1 each-from drop ; inline
1046 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1048 : longest ( seqs -- elt ) [ length ] supremum-by ;
1050 ! We hand-optimize flip to such a degree because type hints
1051 ! cannot express that an array is an array of arrays yet, and
1052 ! this word happens to be performance-critical since the compiler
1053 ! itself uses it. Optimizing it like this reduced compile time.
1056 : generic-flip ( matrix -- newmatrix )
1058 [ first-unsafe length 1 ] keep
1059 [ length min ] (each) (each-integer) iota
1061 [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
1065 : array-length ( array -- len )
1066 { array } declare length>> ; inline
1068 : array-flip ( matrix -- newmatrix )
1071 [ first-unsafe array-length 1 ] keep
1072 [ array-length min ] (each) (each-integer) iota
1074 [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
1078 : flip ( matrix -- newmatrix )
1082 [ array-flip ] [ generic-flip ] if
1083 ] [ generic-flip ] if