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?
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 ] 2keepd set-nth-unsafe ; inline
97 ! The f object supports the sequence protocol trivially
98 M: f length drop 0 ; inline
99 M: f nth-unsafe nip ; inline
100 M: f like drop [ f ] when-empty ; inline
102 INSTANCE: f immutable-sequence
105 TUPLE: iota { n integer read-only } ;
107 ERROR: non-negative-integer-expected n ;
109 : <iota> ( n -- iota )
110 dup 0 < [ non-negative-integer-expected ] when
113 M: iota length n>> ; inline
114 M: iota nth-unsafe drop ; inline
116 INSTANCE: iota immutable-sequence
120 : first-unsafe ( seq -- first ) 0 swap nth-unsafe ; inline
121 : second-unsafe ( seq -- second ) 1 swap nth-unsafe ; inline
122 : third-unsafe ( seq -- third ) 2 swap nth-unsafe ; inline
123 : fourth-unsafe ( seq -- fourth ) 3 swap nth-unsafe ; inline
125 : first2-unsafe ( seq -- first second )
126 [ first-unsafe ] [ second-unsafe ] bi ; inline
128 : first3-unsafe ( seq -- first second third )
129 [ first2-unsafe ] [ third-unsafe ] bi ; inline
131 : first4-unsafe ( seq -- first second third fourth )
132 [ first3-unsafe ] [ fourth-unsafe ] bi ; inline
134 : exchange-unsafe ( m n seq -- )
135 [ [ nth-unsafe ] curry bi@ ]
136 [ [ set-nth-unsafe ] curry bi@ ] 3bi ; inline
138 : (1sequence) ( obj seq -- seq )
139 [ 0 swap set-nth-unsafe ] keep ; inline
141 : (2sequence) ( obj1 obj2 seq -- seq )
142 [ 1 swap set-nth-unsafe ] keep (1sequence) ; inline
144 : (3sequence) ( obj1 obj2 obj3 seq -- seq )
145 [ 2 swap set-nth-unsafe ] keep (2sequence) ; inline
147 : (4sequence) ( obj1 obj2 obj3 obj4 seq -- seq )
148 [ 3 swap set-nth-unsafe ] keep (3sequence) ; inline
152 : head-to-index ( seq to -- zero to seq ) [ 0 ] 2dip swap ; inline
154 : index-to-tail ( seq from -- from length seq ) swap [ length ] keep ; inline
156 : from-tail ( seq n -- seq n' ) [ dup length ] dip - ; 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 : index-or-length ( seq n -- seq n' ) over length min ; inline
187 : index-of-last ( seq -- n seq ) [ length 1 - ] keep ; inline
189 : ?first ( seq -- elt/f ) 0 swap ?nth ; inline
190 : ?second ( seq -- elt/f ) 1 swap ?nth ; inline
191 : ?last ( seq -- elt/f )
192 index-of-last over 0 <
193 [ 2drop f ] [ nth-unsafe ] if ; inline
195 MIXIN: virtual-sequence
196 GENERIC: virtual-exemplar ( seq -- seq' )
197 GENERIC: virtual@ ( n seq -- n' seq' )
199 M: virtual-sequence nth virtual@ nth ; inline
200 M: virtual-sequence set-nth virtual@ set-nth ; inline
201 M: virtual-sequence nth-unsafe virtual@ nth-unsafe ; inline
202 M: virtual-sequence set-nth-unsafe virtual@ set-nth-unsafe ; inline
203 M: virtual-sequence like virtual-exemplar like ; inline
204 M: virtual-sequence new-sequence virtual-exemplar new-sequence ; inline
206 INSTANCE: virtual-sequence sequence
208 ! A reversal of an underlying sequence.
209 TUPLE: reversed { seq read-only } ;
211 C: <reversed> reversed
213 M: reversed virtual-exemplar seq>> ; inline
214 M: reversed virtual@ seq>> [ length swap - 1 - ] keep ; inline
215 M: reversed length seq>> length ; inline
217 INSTANCE: reversed virtual-sequence
219 ! A slice of another sequence.
221 { from integer read-only }
222 { to integer read-only }
225 : >slice< ( slice -- from to seq )
226 [ from>> ] [ to>> ] [ seq>> ] tri ; inline
228 : collapse-slice ( m n slice -- m' n' seq )
229 [ from>> ] [ seq>> ] bi [ [ + ] curry bi@ ] dip ; inline
231 ERROR: slice-error from to seq ;
233 : check-slice ( from to seq -- from to seq )
234 pick 0 < [ slice-error ] when
235 2dup length > [ slice-error ] when
236 2over > [ slice-error ] when ; inline
240 : <slice-unsafe> ( from to seq -- slice )
241 dup slice? [ collapse-slice ] when slice boa ; inline
245 : <slice> ( from to seq -- slice )
246 check-slice <slice-unsafe> ; inline
248 M: slice virtual-exemplar seq>> ; inline
250 M: slice virtual@ [ from>> + ] [ seq>> ] bi ; inline
252 M: slice length [ to>> ] [ from>> ] bi - ; inline
254 : head-slice ( seq n -- slice ) head-to-index <slice> ; inline
256 : tail-slice ( seq n -- slice ) index-to-tail <slice> ; inline
258 : rest-slice ( seq -- slice ) 1 tail-slice ; inline
260 : head-slice* ( seq n -- slice ) from-tail head-slice ; inline
262 : tail-slice* ( seq n -- slice ) from-tail tail-slice ; inline
264 : but-last-slice ( seq -- slice ) 1 head-slice* ; inline
266 INSTANCE: slice virtual-sequence
268 ! One element repeated many times
270 { length integer read-only }
273 : <repetition> ( len elt -- repetition )
274 over 0 < [ non-negative-integer-expected ] when
275 repetition boa ; inline
277 M: repetition length length>> ; inline
278 M: repetition nth-unsafe nip elt>> ; inline
280 INSTANCE: repetition immutable-sequence
284 ERROR: integer-length-expected obj ;
286 ! The check-length call forces partial dispatch
287 : check-length ( n -- n )
288 dup integer? [ integer-length-expected ] unless ; inline
290 : >sequence< ( seq -- i n seq )
291 [ drop 0 ] [ length check-length ] [ ] tri ; inline
293 : length-sequence ( seq -- n seq )
294 [ length check-length ] [ ] bi ; inline
296 : >underlying< ( slice/seq -- i n slice/seq )
297 dup slice? [ >slice< ] [ >sequence< ] if ; inline
300 { src-i integer read-only }
302 { dst-i integer read-only }
307 : copy-nth-unsafe ( n copy -- )
308 [ [ src-i>> + ] [ src>> ] bi nth-unsafe ]
309 [ [ dst-i>> + ] [ dst>> ] bi set-nth-unsafe ] 2bi ; inline
311 : (copy) ( n copy -- dst )
312 over 0 <= [ nip dst>> ] [
313 [ 1 - ] dip [ copy-nth-unsafe ] [ (copy) ] 2bi
314 ] if ; inline recursive
316 : subseq>copy ( from to seq -- n copy )
317 [ over - check-length swap ] dip
318 3dup nip new-sequence 0 swap <copier> ; inline
320 : bounds-check-head ( n seq -- n seq )
321 over 0 < [ bounds-error ] when ; inline
323 : check-copy ( src n dst -- src n dst )
324 3dup bounds-check-head
325 [ swap length + ] dip lengthen ; inline
327 : copy-unsafe ( src i dst -- )
328 [ [ length check-length 0 ] keep ] 2dip <copier> (copy) drop ; inline
330 : subseq-unsafe-as ( from to seq exemplar -- subseq )
331 [ subseq>copy (copy) ] dip like ; inline
333 : subseq-unsafe ( from to seq -- subseq )
334 dup subseq-unsafe-as ; inline
338 : subseq-as ( from to seq exemplar -- subseq )
339 [ check-slice ] dip subseq-unsafe-as ;
341 : subseq ( from to seq -- subseq )
344 : head ( seq n -- headseq ) head-to-index subseq ;
346 : tail ( seq n -- tailseq ) index-to-tail subseq ;
348 : rest ( seq -- tailseq ) 1 tail ;
350 : head* ( seq n -- headseq ) from-tail head ;
352 : tail* ( seq n -- tailseq ) from-tail tail ;
354 : but-last ( seq -- headseq ) 1 head* ;
356 : copy ( src i dst -- ) check-copy copy-unsafe ; inline
358 M: sequence clone-like
359 [ dup length ] dip new-sequence [ 0 swap copy-unsafe ] keep ; inline
361 M: immutable-sequence clone-like like ; inline
363 : push-all ( src dst -- ) [ length ] [ copy ] bi ; inline
367 : (append) ( seq1 seq2 accum -- accum )
368 [ [ over length ] dip copy-unsafe ]
369 [ 0 swap copy-unsafe ]
374 : append-as ( seq1 seq2 exemplar -- newseq )
375 [ 2dup [ length ] bi@ + ] dip
376 [ (append) ] new-like ; inline
378 : append ( seq1 seq2 -- newseq ) over append-as ;
380 : prepend-as ( seq1 seq2 exemplar -- newseq ) swapd append-as ; inline
382 : prepend ( seq1 seq2 -- newseq ) over prepend-as ;
384 : 3append-as ( seq1 seq2 seq3 exemplar -- newseq )
385 [ 3dup [ length ] tri@ + + ] dip [
386 [ [ 2over [ length ] bi@ + ] dip copy-unsafe ]
390 : 3append ( seq1 seq2 seq3 -- newseq ) pick 3append-as ;
392 : surround-as ( seq1 seq2 seq3 exemplar -- newseq )
393 [ swap ] 2dip 3append-as ; inline
395 : surround ( seq1 seq2 seq3 -- newseq ) over surround-as ; inline
397 : 1surround-as ( seq1 seq2 exemplar -- newseq ) dupd surround-as ; inline
399 : 1surround ( seq1 seq2 -- newseq ) dup 1surround-as ; inline
401 : glue-as ( seq1 seq2 seq3 exemplar -- newseq ) swapd 3append-as ; inline
403 : glue ( seq1 seq2 seq3 -- newseq ) pick glue-as ; inline
405 : change-nth ( ..a i seq quot: ( ..a elt -- ..b newelt ) -- ..b )
406 [ [ nth ] dip call ] 2keepd set-nth-unsafe ; inline
408 : min-length ( seq1 seq2 -- n ) [ length ] bi@ min ; inline
410 : max-length ( seq1 seq2 -- n ) [ length ] bi@ max ; inline
414 : sequence-operator ( seq quot -- i n quot' )
415 [ >underlying< [ nth-unsafe ] curry ] dip compose ; inline
417 : length-iterator ( seq -- n quot' )
418 length-sequence [ nth-unsafe ] curry ; inline
420 : length-operator ( seq quot -- n quot' )
421 [ length-iterator ] dip compose ; inline
423 : collect-into ( quot into -- quot' )
424 [ [ keep ] dip set-nth-unsafe ] 2curry ; inline
426 : collect-from ( i n quot into -- )
427 collect-into each-integer-from ; inline
429 : collect ( n quot into -- )
430 collect-into each-integer ; inline
432 : sequence-index-operator ( seq quot -- n quot' )
433 [ length-iterator [ keep ] curry ] dip compose ; inline
435 : map-into ( seq quot into -- )
436 [ length-operator ] dip collect ; inline
438 : 2nth-unsafe ( n seq1 seq2 -- elt1 elt2 )
439 [ nth-unsafe ] bi-curry@ bi ; inline
441 : setup-2each ( seq1 seq2 -- n quot )
442 [ min-length check-length ] 2keep [ 2nth-unsafe ] 2curry ; inline
444 : (2each) ( seq1 seq2 quot -- n quot' )
445 [ setup-2each ] dip compose ; inline
447 : 3nth-unsafe ( n seq1 seq2 seq3 -- elt1 elt2 elt3 )
448 [ nth-unsafe ] tri-curry@ tri ; inline
450 : setup-3each ( seq1 seq2 seq3 -- n quot )
451 [ [ length ] tri@ min min check-length ]
452 [ [ 3nth-unsafe ] 3curry ] 3bi ; inline
454 : (3each) ( seq1 seq2 seq3 quot -- n quot' )
455 [ setup-3each ] dip compose ; inline
457 : element/index ( i/f seq -- elt/f i/f )
458 '[ [ _ nth ] [ f ] if* ] keep ;
460 : index/element ( i/f seq -- i/f elt/f )
461 dupd '[ _ nth ] [ f ] if* ;
463 : (accumulate) ( seq identity quot -- identity seq quot' )
464 swapd [ keepd ] curry ; inline
466 : (accumulate*) ( seq identity quot -- identity seq quot' )
467 swapd [ dup ] compose ; inline
471 : each ( ... seq quot: ( ... x -- ... ) -- ... )
472 sequence-operator each-integer-from ; inline
474 : each-from ( ... seq quot: ( ... x -- ... ) i -- ... )
475 -rot length-operator each-integer-from ; inline
477 : reduce ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... result )
480 : map-integers-from-as ( ... from len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
481 overd [ [ collect-from ] keep ] new-like ; inline
483 : map-integers-as ( ... len quot: ( ... i -- ... elt ) exemplar -- ... newseq )
484 overd [ [ collect ] keep ] new-like ; inline
486 : map-integers ( ... len quot: ( ... i -- ... elt ) -- ... newseq )
487 { } map-integers-as ; inline
489 : map-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
490 [ length-operator ] dip map-integers-as ; inline
492 : map ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
495 : replicate-as ( ... len quot: ( ... -- ... newelt ) exemplar -- ... newseq )
496 [ [ drop ] prepose ] dip map-integers-as ; inline
498 : replicate ( ... len quot: ( ... -- ... newelt ) -- ... newseq )
499 { } replicate-as ; inline
501 : map! ( ... seq quot: ( ... elt -- ... newelt ) -- ... seq )
502 over [ map-into ] keep ; inline
504 : accumulate-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... final newseq )
505 [ (accumulate) ] dip map-as ; inline
507 : accumulate ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final newseq )
508 pick accumulate-as ; inline
510 : accumulate! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... final seq )
511 (accumulate) map! ; inline
513 : accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
514 [ (accumulate*) ] dip map-as nip ; inline
516 : accumulate* ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... newseq )
517 pick accumulate*-as ; inline
519 : accumulate*! ( ... seq identity quot: ( ... prev elt -- ... next ) -- ... seq )
520 (accumulate*) map! nip ; inline
522 : 2each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
523 (2each) each-integer ; inline
525 : 2each-from ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) i -- ... )
526 [ (2each) ] dip -rot each-integer-from ; inline
528 : 2reduce ( ... seq1 seq2 identity quot: ( ... prev elt1 elt2 -- ... next ) -- ... result )
531 : 2map-as ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) exemplar -- ... newseq )
532 [ (2each) ] dip map-integers-as ; inline
534 : 2map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
535 pick 2map-as ; inline
537 : 2all? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
538 (2each) all-integers? ; inline
540 : 2any? ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... ? )
541 negate 2all? not ; inline
543 : 3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
544 (3each) each-integer ; inline
546 : 3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )
547 [ (3each) ] dip map-integers-as ; inline
549 : 3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
550 pickd swap 3map-as ; inline
554 : bounds-check-call ( n seq quot -- elt i )
555 2over bounds-check? [ call ] [ 3drop f f ] if ; inline
557 : find-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
558 [ length-operator find-integer-from ] keepd
559 index/element ; inline
561 : find-last-from-unsafe ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
562 [ length-operator nip find-last-integer ] keepd
563 index/element ; inline
567 : find-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
568 '[ _ find-from-unsafe ] bounds-check-call ; inline
570 : find ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
571 [ 0 ] 2dip find-from-unsafe ; inline
573 : find-last-from ( ... n seq quot: ( ... elt -- ... ? ) -- ... i elt )
574 '[ _ find-last-from-unsafe ] bounds-check-call ; inline
576 : find-last ( ... seq quot: ( ... elt -- ... ? ) -- ... i elt )
577 [ index-of-last ] dip find-last-from ; inline
579 : find-index-from ( ... n seq quot: ( ... elt i -- ... ? ) -- ... i elt )
581 _ [ sequence-index-operator find-integer-from ] keepd
583 ] bounds-check-call ; inline
585 : find-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
586 [ 0 ] 2dip find-index-from ; inline
588 : all? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
589 sequence-operator all-integers-from? ; inline
591 : push-if ( ..a elt quot: ( ..a elt -- ..b ? ) accum -- ..b )
592 [ keep ] dip rot [ push ] [ 2drop ] if ; inline
596 : (selector-as) ( quot length exemplar -- selector accum )
597 new-resizable [ [ push-if ] 2curry ] keep ; inline
601 : selector-as ( quot exemplar -- selector accum )
602 [ length ] keep (selector-as) ; inline
604 : selector ( quot -- selector accum )
605 V{ } selector-as ; inline
607 : filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
608 pick length over [ (selector-as) [ each ] dip ] 2curry dip like ; inline
610 : filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
611 over filter-as ; inline
613 : reject-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )
614 [ negate ] [ filter-as ] bi* ; inline
616 : reject ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
617 over reject-as ; inline
619 : push-either ( ..a elt quot: ( ..a elt -- ..b ? ) accum1 accum2 -- ..b )
620 [ keep swap ] 2dip ? push ; inline
622 : 2selector ( quot -- selector accum1 accum2 )
623 V{ } clone V{ } clone [ [ push-either ] 3curry ] 2keep ; inline
625 : partition ( ... seq quot: ( ... elt -- ... ? ) -- ... trueseq falseseq )
626 over [ 2selector [ each ] 2dip ] dip [ like ] curry bi@ ; inline
628 : collector-for-as ( seq quot exemplar -- seq quot' vec )
629 [ over length ] dip new-resizable [ [ push ] curry compose ] keep ; inline
631 : collector-as ( quot exemplar -- quot' vec )
632 [ length ] keep new-resizable [ [ push ] curry compose ] keep ; inline
634 : collector-for ( seq quot -- seq quot' vec )
635 V{ } collector-for-as ; inline
637 : collector ( quot -- quot' vec )
638 V{ } collector-as ; inline
640 : produce-as ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) exemplar -- ..b seq )
641 dup [ collector-as [ while ] dip ] curry dip like ; inline
643 : produce ( ..a pred: ( ..a -- ..b ? ) quot: ( ..b -- ..a obj ) -- ..b seq )
644 { } produce-as ; inline
646 : follow ( ... obj quot: ( ... prev -- ... result/f ) -- ... seq )
647 [ dup ] swap [ keep ] curry produce nip ; inline
649 : each-index ( ... seq quot: ( ... elt index -- ... ) -- ... )
650 sequence-index-operator each-integer ; inline
652 : map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
653 [ dup length <iota> ] 2dip 2map-as ; inline
655 : map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
656 over map-index-as ; inline
658 : interleave ( ... seq between quot: ( ... elt -- ... ) -- ... )
659 pick empty? [ 3drop ] [
660 [ [ drop first-unsafe ] dip call ]
661 [ [ bi* ] 2curry 1 each-from ]
665 : reduce-index ( ... seq identity quot: ( ... prev elt index -- ... next ) -- ... result )
666 swapd each-index ; inline
668 : index ( obj seq -- n )
669 [ = ] with find drop ;
671 : index-from ( obj i seq -- n )
672 rot [ = ] curry find-from drop ;
674 : last-index ( obj seq -- n )
675 [ = ] with find-last drop ;
677 : last-index-from ( obj i seq -- n )
678 rot [ = ] curry find-last-from drop ;
680 : indices ( obj seq -- indices )
681 swap [ = ] curry [ swap ] prepose V{ } clone [
682 [ push ] curry [ [ drop ] if ] curry compose each-index
687 : nths-unsafe ( indices seq -- seq' )
688 [ [ nth-unsafe ] curry ] keep map-as ;
692 : nths ( indices seq -- seq' )
693 [ [ nth ] curry ] keep map-as ;
695 : any? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
696 find drop >boolean ; inline
698 : none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
701 : member? ( elt seq -- ? )
704 : member-eq? ( elt seq -- ? )
707 : remove ( elt seq -- newseq )
710 : remove-eq ( elt seq -- newseq )
711 [ eq? ] with reject ;
713 : sift ( seq -- newseq )
716 : harvest ( seq -- newseq )
721 : mismatch-unsafe ( n seq1 seq2 -- i )
722 [ 2nth-unsafe = not ] 2curry find-integer ; inline
726 : mismatch ( seq1 seq2 -- i )
727 [ min-length ] 2keep mismatch-unsafe ;
730 [ mismatch ] 2keep pick
731 [ 2nth-unsafe <=> ] [ [ length ] compare nip ] if ;
733 : sequence= ( seq1 seq2 -- ? )
734 2dup [ length ] bi@ dupd =
735 [ -rot mismatch-unsafe not ] [ 3drop f ] if ; inline
737 ERROR: assert-sequence got expected ;
739 : assert-sequence= ( a b -- )
740 2dup sequence= [ 2drop ] [ assert-sequence ] if ;
742 M: reversed equal? over reversed? [ sequence= ] [ 2drop f ] if ;
744 M: slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
748 : sequence-hashcode-step ( oldhash newpart -- newhash )
749 integer>fixnum swap [
750 [ -2 fixnum-shift-fast ] [ 5 fixnum-shift-fast ] bi
751 fixnum+fast fixnum+fast
752 ] keep fixnum-bitxor ; inline
756 : sequence-hashcode ( n seq -- x )
757 [ 0 ] 2dip [ hashcode* sequence-hashcode-step ] with each ; inline
759 M: sequence hashcode* [ sequence-hashcode ] recursive-hashcode ;
762 over 0 <= [ 2drop 0 ] [
763 nip length 0 swap [ sequence-hashcode-step ] each-integer
766 M: reversed hashcode* [ sequence-hashcode ] recursive-hashcode ;
768 M: slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
770 : move ( to from seq -- )
772 [ 3drop ] [ [ nth swap ] [ set-nth ] bi ] if ; inline
776 : move-unsafe* ( to from seq -- from-nth )
779 [ [ nth-unsafe tuck swap ] [ set-nth-unsafe ] bi ] if ; inline
781 : filter-from! ( store from seq quot: ( ... elt -- ... ? ) -- seq )
783 [ [ move-unsafe* ] dip call ] 4keep
784 [ swap [ 1 + ] when ] 3dip
785 [ 1 + ] 2dip filter-from!
786 ] [ drop [ nip set-length ] keep ] if ; inline recursive
788 : move-unsafe ( to from seq -- )
790 [ 3drop ] [ [ nth-unsafe swap ] [ set-nth-unsafe ] bi ] if ; inline
794 : filter! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
795 [ 0 0 ] 2dip filter-from! ; inline
797 : reject! ( ... seq quot: ( ... elt -- ... ? ) -- ... seq )
798 negate filter! ; inline
800 : remove! ( elt seq -- seq )
803 : remove-eq! ( elt seq -- seq )
804 [ eq? ] with reject! ;
806 : prefix ( seq elt -- newseq )
807 over [ over length 1 + ] dip [
808 (1sequence) [ 1 swap copy-unsafe ] keep
811 : suffix ( seq elt -- newseq )
812 over [ over length 1 + ] dip [
813 [ [ over length ] dip set-nth-unsafe ] keep
814 [ 0 swap copy-unsafe ] keep
817 : suffix! ( seq elt -- seq ) over push ; inline
819 : append! ( seq1 seq2 -- seq1 ) over push-all ; inline
821 : last ( seq -- elt )
823 over 0 < [ bounds-error ] [ nth-unsafe ] if ; inline
827 : last-unsafe ( seq -- elt )
828 index-of-last nth-unsafe ; inline
832 : set-last ( elt seq -- )
834 over 0 < [ bounds-error ] [ set-nth-unsafe ] if ; inline
836 : pop* ( seq -- ) index-of-last shorten ;
840 : move-backward ( shift from to seq -- )
844 [ [ 2over + pick ] dip move-unsafe [ 1 + ] dip ] keep
848 : move-forward ( shift from to seq -- )
852 [ [ [ ] [ nip + ] [ 2nip ] 3tri ] dip move-unsafe 1 - ] keep
856 : (open-slice) ( shift from to seq ? -- )
858 [ [ 1 - ] bi@ ] dip move-forward
860 [ over - ] 2dip move-backward
863 : open-slice ( shift from seq -- )
867 [ ] [ nip length + ] [ 2nip ] 3tri
868 [ pick 0 > [ [ length ] keep ] dip (open-slice) ] 2dip
874 : delete-slice ( from to seq -- )
875 check-slice [ over [ - ] dip ] dip open-slice ;
877 : remove-nth! ( n seq -- seq )
878 [ [ dup 1 + ] dip delete-slice ] keep ;
880 : snip ( from to seq -- head tail )
881 [ swap head ] [ swap tail ] bi-curry bi* ; inline
883 : snip-slice ( from to seq -- head tail )
884 [ swap head-slice ] [ swap tail-slice ] bi-curry bi* ; inline
886 : replace-slice ( new from to seq -- seq' )
887 snip-slice surround ;
889 : remove-nth ( n seq -- seq' )
890 [ [ dup 1 + ] dip snip-slice ] keep append-as ;
893 index-of-last over 0 >=
894 [ [ nth-unsafe ] [ shorten ] 2bi ]
895 [ bounds-error ] if ;
897 : exchange ( m n seq -- )
898 [ nip bounds-check 2drop ]
899 [ bounds-check 3drop ]
903 : midpoint@ ( seq -- n ) length 2/ ; inline
905 : reverse! ( seq -- seq )
907 [ midpoint@ ] [ length ] [ ] tri
908 [ [ over - 1 - ] dip exchange-unsafe ] 2curry
912 : reverse ( seq -- newseq )
914 dup [ length ] keep new-sequence
915 [ 0 swap copy-unsafe ] keep reverse!
918 GENERIC: sum-lengths ( seq -- n )
920 M: object sum-lengths
921 0 [ length + ] reduce ;
923 M: repetition sum-lengths
924 [ length>> ] [ elt>> length ] bi * ;
926 : concat-as ( seq exemplar -- newseq )
928 [ dup sum-lengths ] dip new-resizable
929 [ [ push-all ] curry each ] keep
932 : concat ( seq -- newseq )
933 [ { } ] [ dup first concat-as ] if-empty ;
937 : joined-length ( seq glue -- n )
938 [ [ sum-lengths ] [ length 1 [-] ] bi ] dip length * + ;
942 : join-as ( seq glue exemplar -- newseq )
943 over empty? [ nip concat-as ] [
945 2dup joined-length over new-resizable [
946 [ [ push-all ] 2curry ]
947 [ nip [ push-all ] curry ] 2bi
953 : join ( seq glue -- newseq )
958 : padding ( ... seq n elt quot: ( ... seq1 seq2 -- ... newseq ) -- ... newseq )
960 [ over length [-] dup 0 = [ drop ] ] dip
961 [ <repetition> ] curry
962 ] dip compose if ; inline
966 : pad-head ( seq n elt -- padded )
967 [ swap dup append-as ] padding ;
969 : pad-tail ( seq n elt -- padded )
972 : shorter? ( seq1 seq2 -- ? ) [ length ] bi@ < ; inline
973 : longer? ( seq1 seq2 -- ? ) [ length ] bi@ > ; inline
974 : shorter ( seq1 seq2 -- seq ) [ [ length ] bi@ <= ] 2keep ? ; inline
975 : longer ( seq1 seq2 -- seq ) [ [ length ] bi@ >= ] 2keep ? ; inline
977 : head? ( seq begin -- ? )
981 [ length [ head-slice ] keep swap ] keep
985 : tail? ( seq end -- ? )
989 [ length [ tail-slice* ] keep swap ] keep
993 : cut-slice ( seq n -- before-slice after-slice )
994 [ head-slice ] [ tail-slice ] 2bi ; inline
996 : cut-slice* ( seq n -- before-slice after-slice )
997 [ head-slice* ] [ tail-slice* ] 2bi ;
999 : insert-nth ( elt n seq -- seq' )
1000 swap cut-slice [ swap suffix ] dip append ;
1002 : halves ( seq -- first-slice second-slice )
1003 dup midpoint@ cut-slice ; inline
1007 : nth2-unsafe ( n seq -- a b )
1008 [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
1010 : nth3-unsafe ( n seq -- a b c )
1011 [ nth2-unsafe ] [ [ 2 + ] dip nth-unsafe ] 2bi ; inline
1013 : (binary-reduce) ( seq start quot: ( elt1 elt2 -- newelt ) from length -- value )
1014 ! We can't use case here since combinators depends on
1019 [ 2nip swap nth-unsafe ]
1020 [ -rot [ drop swap nth2-unsafe ] dip call ]
1021 [ -rot [ drop swap nth3-unsafe ] dip bi@ ]
1024 [ 2/ ] [ over - ] bi [ 2dup + ] dip
1025 [ (binary-reduce) ] [ 2curry ] curry 2bi@
1026 pick [ 3bi ] dip call
1027 ] if ; inline recursive
1031 : binary-reduce ( seq start quot: ( elt1 elt2 -- newelt ) -- value )
1033 [ seq>> ] 3dip [ from>> 0 max ] [ to>> 0 max over - ] bi
1036 ] if (binary-reduce) ; inline
1038 : cut ( seq n -- before after )
1039 [ head ] [ tail ] 2bi ;
1041 : cut* ( seq n -- before after )
1042 [ head* ] [ tail* ] 2bi ;
1044 : subseq-starts-at? ( i seq subseq -- ? )
1045 [ length swap ] keep
1047 [ + _ nth-unsafe ] keep _ nth-unsafe =
1048 ] with all-integers? ; inline
1050 : subseq-index-from ( n seq subseq -- i/f )
1051 [ [ length ] bi@ - 1 + ] 2keep
1052 '[ _ _ subseq-starts-at? ] find-integer-from ; inline
1054 : subseq-index ( seq subseq -- i/f ) [ 0 ] 2dip subseq-index-from ; inline
1056 : subseq-of? ( seq subseq -- ? ) subseq-index >boolean ; inline
1058 : subseq-start-from ( subseq seq n -- i/f )
1059 spin subseq-index-from ; inline deprecated
1061 : subseq-start ( subseq seq -- i/f ) swap subseq-index ; inline deprecated
1063 : subseq? ( subseq seq -- ? ) subseq-start >boolean ; inline deprecated
1065 : drop-prefix ( seq1 seq2 -- slice1 slice2 )
1066 2dup mismatch [ 2dup min-length ] unless*
1067 [ tail-slice ] curry bi@ ;
1069 : unclip ( seq -- rest first )
1070 [ rest ] [ first-unsafe ] bi ;
1072 : unclip-last ( seq -- butlast last )
1073 [ but-last ] [ last-unsafe ] bi ;
1075 : unclip-slice ( seq -- rest-slice first )
1076 [ rest-slice ] [ first-unsafe ] bi ; inline
1078 : map-reduce ( ..a seq map-quot: ( ..a elt -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1079 [ [ [ first ] keep ] dip [ dip ] keep ] dip
1080 '[ swap _ dip swap @ ] 1 each-from ; inline
1082 : 2map-reduce ( ..a seq1 seq2 map-quot: ( ..a elt1 elt2 -- ..a intermediate ) reduce-quot: ( ..a prev intermediate -- ..a next ) -- ..a result )
1083 [ [ [ [ first ] bi@ ] 2keep ] dip [ 2dip ] keep ] dip
1084 '[ rot _ dip swap @ ] 1 2each-from ; inline
1088 : (map-find) ( seq quot find-quot -- result elt )
1089 [ [ f ] 2dip [ nip ] prepose [ dup ] compose ] dip call nip ; inline
1093 : map-find ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1094 [ find ] (map-find) ; inline
1096 : map-find-last ( ... seq quot: ( ... elt -- ... result/f ) -- ... result elt )
1097 [ find-last ] (map-find) ; inline
1099 : unclip-last-slice ( seq -- butlast-slice last )
1100 [ but-last-slice ] [ last-unsafe ] bi ; inline
1104 : (trim-head) ( seq quot -- seq n )
1105 over [ negate find drop ] dip swap
1106 [ dup length ] unless* ; inline
1108 : (trim-tail) ( seq quot -- seq n )
1109 over [ negate find-last drop ?1+ ] dip
1114 : trim-head-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1115 (trim-head) tail-slice ; inline
1117 : trim-head ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1118 (trim-head) tail ; inline
1120 : trim-tail-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1121 (trim-tail) head-slice ; inline
1123 : trim-tail ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1124 (trim-tail) head ; inline
1126 : trim-slice ( ... seq quot: ( ... elt -- ... ? ) -- ... slice )
1127 [ trim-head-slice ] [ trim-tail-slice ] bi ; inline
1129 : trim ( ... seq quot: ( ... elt -- ... ? ) -- ... newseq )
1130 [ trim-slice ] [ drop ] 2bi like ; inline
1132 GENERIC: sum ( seq -- n )
1133 M: object sum 0 [ + ] binary-reduce ; inline
1134 M: iota sum length dup 1 - * 2/ ; inline
1135 M: repetition sum [ elt>> ] [ length>> ] bi * ; inline
1137 : product ( seq -- n ) 1 [ * ] binary-reduce ;
1139 : infimum ( seq -- elt ) [ ] [ min ] map-reduce ;
1141 : supremum ( seq -- elt ) [ ] [ max ] map-reduce ;
1143 : map-sum ( ... seq quot: ( ... elt -- ... n ) -- ... n )
1144 [ 0 ] 2dip [ dip + ] curry [ swap ] prepose each ; inline
1146 : count ( ... seq quot: ( ... elt -- ... ? ) -- ... n )
1147 [ 1 0 ? ] compose map-sum ; inline
1149 : cartesian-each ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ) -- ... )
1150 [ with each ] 2curry each ; inline
1152 : cartesian-map ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... newseq )
1153 [ with { } map-as ] 2curry { } map-as ; inline
1155 : cartesian-product-as ( seq1 seq2 exemplar -- newseq )
1156 [ 2sequence ] curry cartesian-map ; inline
1158 : cartesian-product ( seq1 seq2 -- newseq )
1159 dup cartesian-product-as ; inline
1161 : cartesian-find ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... elt1 elt2 )
1162 [ f ] 3dip [ with find swap ] 2curry [ nip ] prepose find nip swap ; inline
1166 : select-by ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... elt )
1168 [ keep swap ] curry [ [ first ] dip call ] 2keep
1169 [ curry 2dip pick over ] curry
1171 [ [ 2drop ] [ 2nipd ] if ] compose
1172 ] bi* compose 1 each-from drop ; inline
1176 : supremum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1177 [ after? ] select-by ; inline
1179 : infimum-by ( ... seq quot: ( ... elt -- ... x ) -- ... elt )
1180 [ before? ] select-by ; inline
1182 : shortest ( seqs -- elt ) [ length ] infimum-by ;
1184 : longest ( seqs -- elt ) [ length ] supremum-by ;
1186 ! We hand-optimize flip to such a degree because type hints
1187 ! cannot express that an array is an array of arrays yet, and
1188 ! this word happens to be performance-critical since the compiler
1189 ! itself uses it. Optimizing it like this reduced compile time.
1192 : generic-flip ( matrix -- newmatrix )
1193 [ [ length ] [ min ] map-reduce ] keep
1194 '[ _ [ nth-unsafe ] with { } map-as ] map-integers ; inline
1198 : array-flip ( matrix -- newmatrix )
1200 [ [ { array } declare length>> ] [ min ] map-reduce ] keep
1201 '[ _ [ { array } declare array-nth ] with { } map-as ] map-integers ;
1205 : flip ( matrix -- newmatrix )
1209 [ array-flip ] [ generic-flip ] if
1210 ] [ generic-flip ] if