623 lines
19 KiB
Factor
623 lines
19 KiB
Factor
USING: accessors arrays assocs combinators fry generalizations
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grouping growable kernel locals make math math.order math.ranges
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sequences sequences.deep sequences.private sorting splitting
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vectors ;
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IN: sequences.extras
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: find-all ( ... seq quot: ( ... elt -- ... ? ) -- ... elts )
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[ <enumerated> ] dip '[ nip @ ] assoc-filter ; inline
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: reduce-from ( ... seq identity quot: ( ... prev elt -- ... next ) i -- ... result )
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[ swap ] 2dip each-from ; inline
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:: subseq* ( from to seq -- subseq )
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seq length :> len
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from [ dup 0 < [ len + ] when ] [ 0 ] if*
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to [ dup 0 < [ len + ] when ] [ len ] if*
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[ 0 len clamp ] bi@ dupd max seq subseq ;
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: safe-subseq ( from to seq -- subseq )
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[ length '[ 0 _ clamp ] bi@ ] keep subseq ;
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: all-subseqs ( seq -- seqs )
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dup length [1,b] [ clump ] with map concat ;
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:: each-subseq ( ... seq quot: ( ... subseq -- ... ) -- ... )
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seq length :> len
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len [0,b] |[ from |
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from len (a,b] |[ to |
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from to seq subseq quot call
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] each
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] each ; inline
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: map-like ( seq exemplar -- seq' )
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'[ _ like ] map ; inline
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: filter-all-subseqs-range ( ... seq range quot: ( ... subseq -- ... ) -- seq )
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[
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'[ <clumps> _ filter ] with map concat
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] 3keep 2drop map-like ; inline
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: filter-all-subseqs ( ... seq quot: ( ... subseq -- ... ) -- seq )
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[ dup length [1,b] ] dip filter-all-subseqs-range ; inline
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:: longest-subseq ( seq1 seq2 -- subseq )
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seq1 length :> len1
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seq2 length :> len2
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0 :> n!
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0 :> end!
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len1 1 + [ len2 1 + 0 <array> ] replicate :> table
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len1 [1,b] |[ x |
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len2 [1,b] |[ y |
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x 1 - seq1 nth-unsafe
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y 1 - seq2 nth-unsafe = [
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y 1 - x 1 - table nth-unsafe nth-unsafe 1 + :> len
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len y x table nth-unsafe set-nth-unsafe
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len n > [ len n! x end! ] when
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] [ 0 y x table nth-unsafe set-nth-unsafe ] if
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] each
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] each end n - end seq1 subseq ;
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: pad-longest ( seq1 seq2 elt -- seq1 seq2 )
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[ 2dup max-length ] dip [ pad-tail ] 2curry bi@ ;
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:: pad-center ( seq n elt -- padded )
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n seq length [-] :> extra
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extra 2/ :> left
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extra left - :> right
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left elt <repetition> seq right elt <repetition>
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seq 3append-as ;
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: change-nths ( ... indices seq quot: ( ... elt -- ... elt' ) -- ... )
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[ change-nth ] 2curry each ; inline
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: push-if-index ( ..a elt i quot: ( ..a elt i -- ..b ? ) accum -- ..b )
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[ 2keep drop ] dip rot [ push ] [ 2drop ] if ; inline
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: push-if* ( ..a elt quot: ( ..a elt -- ..b obj/f ) accum -- ..b )
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[ call ] dip [ push ] [ drop ] if* ; inline
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<PRIVATE
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: (index-selector-as) ( quot length exampler -- selector accum )
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new-resizable [ [ push-if-index ] 2curry ] keep ; inline
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: (selector-as*) ( quot length exemplar -- selector accum )
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new-resizable [ [ push-if* ] 2curry ] keep ; inline
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PRIVATE>
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: index-selector-as ( quot exemplar -- selector accum )
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[ length ] keep (index-selector-as) ; inline
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: index-selector ( quot -- selector accum )
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V{ } index-selector-as ; inline
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: selector-as* ( quot exemplar -- selector accum )
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[ length ] keep (selector-as*) ; inline
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: selector* ( quot -- selector accum ) V{ } selector-as* ; inline
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: filter-index-as ( ... seq quot: ( ... elt i -- ... ? ) exemplar -- ... seq' )
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pick length over [ (index-selector-as) [ each-index ] dip ] 2curry dip like ; inline
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: filter-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... seq' )
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over filter-index-as ; inline
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: even-indices ( seq -- seq' )
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[ length 1 + 2/ ] keep [
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[ [ 2 * ] dip nth-unsafe ] curry
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] keep map-integers ;
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: odd-indices ( seq -- seq' )
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[ length 2/ ] keep [
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[ [ 2 * 1 + ] dip nth-unsafe ] curry
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] keep map-integers ;
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: compact ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
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[ split-when harvest ] dip join ; inline
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: collapse ( ... seq quot: ( ... elt -- ... ? ) elt -- ... seq' )
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[ split-when ] dip
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[ [ harvest ] dip join ]
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[ [ first empty? ] dip [ prepend ] curry when ]
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[ [ last empty? ] dip [ append ] curry when ]
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2tri ; inline
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:: slice-when ( seq quot: ( elt -- ? ) -- seq' )
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seq length :> len
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0 [ len dupd < ] [
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dup seq quot find-from drop
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[ 2dup = [ 1 + ] when ] [ len ] if*
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[ seq <slice> ] keep len or swap
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] produce nip ; inline
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: cut-slice* ( seq n -- before after )
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[ head-slice* ] [ tail-slice* ] 2bi ;
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: ?<slice> ( from/f to/f sequence -- slice )
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[ [ 0 ] unless* ] 2dip
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over [ nip [ length ] [ ] bi ] unless
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<slice> ; inline
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: sequence>slice ( sequence -- slice )
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[ drop 0 ] [ length ] [ ] tri <slice> ; inline
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: slice-order-by-from ( slice1 slice2 -- slice-lt slice-gt )
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2dup [ from>> ] bi@ > [ swap ] when ; inline
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: ordered-slices-range ( slice-lt slice-gt -- to from )
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[ to>> ] [ from>> ] bi* ;
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: unordered-slices-range ( slice1 slice2 -- to from )
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slice-order-by-from ordered-slices-range ;
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: ordered-slices-overlap? ( slice-lt slice-gt -- ? )
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ordered-slices-range > ; inline
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: unordered-slices-overlap? ( slice1 slice2 -- ? )
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unordered-slices-range > ; inline
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: slices-overlap? ( slice1 slice2 -- ? )
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unordered-slices-overlap? ;
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: ordered-slices-touch? ( slice-lt slice-gt -- ? )
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ordered-slices-range >= ; inline
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: unordered-slices-touch? ( slice1 slice2 -- ? )
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unordered-slices-range >= ; inline
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: slices-touch? ( slice1 slice2 -- ? )
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unordered-slices-touch? ;
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ERROR: slices-don't-touch slice1 slice2 ;
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: merge-slices ( slice1 slice2 -- slice/* )
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slice-order-by-from
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2dup ordered-slices-touch? [
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[ from>> ] [ [ to>> ] [ seq>> ] bi ] bi* <slice>
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] [
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slices-don't-touch
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] if ;
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: rotate ( seq n -- seq' )
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over length mod dup 0 >= [ cut ] [ abs cut* ] if prepend ;
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ERROR: underlying-mismatch slice1 slice2 ;
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: ensure-same-underlying ( slice1 slice2 -- slice1 slice2 )
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2dup [ seq>> ] bi@ eq? [ underlying-mismatch ] unless ;
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: span-slices ( slice1 slice2 -- slice )
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ensure-same-underlying
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[ [ from>> ] bi@ min ]
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[ [ to>> ] bi@ max ]
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[ drop seq>> ] 2tri <slice> ;
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: ?span-slices ( slice1/f slice2/f -- slice )
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2dup and [ span-slices ] [ or ] if ;
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:: rotate! ( seq n -- )
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seq length :> len
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n len mod dup 0 < [ len + ] when seq bounds-check drop 0 over
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[ 2dup = ] [
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[ seq exchange-unsafe ] [ [ 1 + ] bi@ ] 2bi
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dup len = [ drop over ] when
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2over = [ -rot nip over ] when
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] until 3drop ;
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: all-rotations ( seq -- seq' )
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dup length <iota> [ rotate ] with map ;
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<PRIVATE
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: (appender-for) ( quot length exemplar -- appender accum )
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new-resizable [ [ push-all ] curry compose ] keep ; inline
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PRIVATE>
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: appender-for ( quot exemplar -- appender accum )
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[ length ] keep (appender-for) ; inline
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: appender ( quot -- appender accum )
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V{ } appender-for ; inline
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: map-concat-as ( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
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[ appender-for [ each ] dip ] keep like ; inline
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: >resizable ( seq -- accum ) ! fixes map-concat "cannot apply call to run-time..."
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[ length ] keep [ new-resizable ] [ append! ] bi ;
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: map-concat ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
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over empty? [ 2drop { } ] [
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[ [ first ] dip call ] 2keep rot [
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>resizable [ '[ @ _ push-all ] 1 each-from ] keep
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] keep like
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] if ; inline
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: map-filter-as ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) exemplar -- ... subseq )
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[ pick ] dip swap length over
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[ (selector-as) [ compose each ] dip ] 2curry dip like ; inline
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: map-filter ( ... seq map-quot: ( ... elt -- ... newelt ) filter-quot: ( ... newelt -- ... ? ) -- ... subseq )
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pick map-filter-as ; inline
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: map-sift ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
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[ ] map-filter ; inline
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: map-harvest ( ... seq quot: ( ... elt -- ... newelt ) -- ... newseq )
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[ empty? not ] map-filter ; inline
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<PRIVATE
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: (setup-each-from) ( i seq -- n quot )
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[ length over [-] swap ] keep '[ _ + _ nth-unsafe ] ; inline
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: setup-each-from ( i seq quot -- n quot' )
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[ (setup-each-from) ] dip compose ; inline
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PRIVATE>
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: map-from-as ( ... seq quot: ( ... elt -- ... newelt ) i exemplar -- ... newseq )
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[ -rot setup-each-from ] dip map-integers ; inline
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: map-from ( ... seq quot: ( ... elt -- ... newelt ) i -- ... newseq )
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pick map-from-as ; inline
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<PRIVATE
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: push-map-if ( ..a elt filter-quot: ( ..a elt -- ..b ? ) map-quot: ( ..a elt -- ..b newelt ) accum -- ..b )
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[ keep over ] 2dip [ when ] dip rot [ push ] [ 2drop ] if ; inline
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: (filter-mapper-for) ( filter-quot map-quot length exempler -- filter-mapper accum )
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new-resizable [ [ push-map-if ] 3curry ] keep ; inline
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: filter-mapper-for ( filter-quot map-quot exemplar -- filter-mapper accum )
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[ length ] keep (filter-mapper-for) ; inline
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: filter-mapper ( filter-quot map-quot -- filter-mapper accum )
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V{ } filter-mapper-for ; inline
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PRIVATE>
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: filter-map-as ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
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[ pick ] dip swap length over
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[ (filter-mapper-for) [ each ] dip ] 2curry dip like ; inline
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: filter-map ( ... seq filter-quot: ( ... elt -- ... ? ) map-quot: ( ... elt -- ... newelt ) -- ... newseq )
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pick filter-map-as ; inline
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: 2map-sum ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... n ) -- ... n )
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[ 0 ] 3dip [ dip + ] curry [ rot ] prepose 2each ; inline
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: 2count ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... ? ) -- ... n )
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[ 1 0 ? ] compose 2map-sum ; inline
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: round-robin ( seq -- newseq )
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[ { } ] [
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[ longest length <iota> ] keep
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[ [ ?nth ] with map ] curry map concat sift
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] if-empty ;
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: sift-as ( seq exemplar -- newseq )
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[ ] swap filter-as ;
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: sift! ( seq -- newseq )
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[ ] filter! ;
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: harvest-as ( seq exemplar -- newseq )
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[ empty? not ] swap filter-as ;
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: harvest! ( seq -- newseq )
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[ empty? ] reject! ;
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: head-as ( seq n exemplar -- seq' )
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[ head-slice ] [ like ] bi* ; inline
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: head*-as ( seq n exemplar -- seq' )
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[ head-slice* ] [ like ] bi* ; inline
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: tail-as ( seq n exemplar -- seq' )
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[ tail-slice ] [ like ] bi* ; inline
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: tail*-as ( seq n exemplar -- seq' )
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[ tail-slice* ] [ like ] bi* ; inline
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: trim-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... newseq )
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[ trim-slice ] [ like ] bi* ; inline
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: ?trim ( seq quot: ( elt -- ? ) -- seq/newseq )
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over empty? [ drop ] [
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over [ first-unsafe ] [ last-unsafe ] bi pick either?
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[ trim ] [ drop ] if
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] if ; inline
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: ?trim-head ( seq quot: ( elt -- ? ) -- seq/newseq )
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over empty? [ drop ] [
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over first-unsafe over call
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[ trim-head ] [ drop ] if
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] if ; inline
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: ?trim-tail ( seq quot: ( elt -- ? ) -- seq/newseq )
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over empty? [ drop ] [
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over last-unsafe over call
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[ trim-tail ] [ drop ] if
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] if ; inline
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: unsurround ( newseq seq2 seq3 -- seq1 )
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[ ?head drop ] [ ?tail drop ] bi* ;
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: none? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
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any? not ; inline
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: one? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? )
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[ find ] 2keep rot [
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[ 1 + ] 2dip find-from drop not
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] [ 3drop f ] if ; inline
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: map-index! ( ... seq quot: ( ... elt index -- ... newelt ) -- ... seq )
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over [ [ (each-index) ] dip collect ] keep ; inline
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<PRIVATE
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: (2each-index) ( seq1 seq2 quot -- n quot' )
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[ setup-2each [ keep ] curry ] dip compose ; inline
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PRIVATE>
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: 2each-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... ) -- ... )
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(2each-index) each-integer ; inline
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: 2map-into ( seq1 seq2 quot into -- )
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[ (2each) ] dip collect ; inline
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: 2map! ( ... seq1 seq2 quot: ( ... elt1 elt2 -- ... newelt ) -- ... seq1 )
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pick [ 2map-into ] keep ; inline
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: 2map-index ( ... seq1 seq2 quot: ( ... elt1 elt2 index -- ... newelt ) -- ... newseq )
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pick [ (2each-index) ] dip map-integers ; inline
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TUPLE: evens seq length ;
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: <evens> ( seq -- evens )
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dup length 1 + 2/ evens boa ; inline
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M: evens length length>> ; inline
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M: evens nth-unsafe [ 2 * ] [ seq>> nth-unsafe ] bi* ; inline
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INSTANCE: evens immutable-sequence
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TUPLE: odds seq length ;
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: <odds> ( seq -- odds )
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dup length 2/ odds boa ; inline
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M: odds length length>> ; inline
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M: odds nth-unsafe [ 2 * 1 + ] [ seq>> nth-unsafe ] bi* ; inline
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INSTANCE: odds immutable-sequence
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: until-empty ( seq quot -- )
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[ dup empty? ] swap until drop ; inline
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: arg-max ( seq -- n )
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<enumerated> [ second-unsafe ] supremum-by first ;
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: arg-min ( seq -- n )
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<enumerated> [ second-unsafe ] infimum-by first ;
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<PRIVATE
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: push-index-if ( ..a elt i quot: ( ..a elt -- ..b ? ) accum -- ..b )
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[ dip ] dip rot [ push ] [ 2drop ] if ; inline
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PRIVATE>
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: arg-where ( ... seq quot: ( ... elt -- ... ? ) -- ... indices )
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over length <vector> [
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[ push-index-if ] 2curry each-index
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] keep ; inline
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: arg-sort ( seq -- indices )
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zip-index sort-keys values ;
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: first= ( seq elt -- ? ) [ first ] dip = ; inline
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: second= ( seq elt -- ? ) [ second ] dip = ; inline
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: third= ( seq elt -- ? ) [ third ] dip = ; inline
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: fourth= ( seq elt -- ? ) [ fourth ] dip = ; inline
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: last= ( seq elt -- ? ) [ last ] dip = ; inline
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: nth= ( n seq elt -- ? ) [ nth ] dip = ; inline
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: first? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ first ] dip call ; inline
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: second? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ second ] dip call ; inline
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: third? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ third ] dip call ; inline
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: fourth? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ fourth ] dip call ; inline
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: last? ( ... seq quot: ( ... elt -- ... ? ) -- ... ? ) [ last ] dip call ; inline
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: nth? ( ... n seq quot: ( ... elt -- ... ? ) -- ... ? ) [ nth ] dip call ; inline
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: loop>sequence ( quot exemplar -- seq )
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[ '[ [ @ [ [ , ] when* ] keep ] loop ] ] dip make ; inline
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: loop>array ( quot -- seq )
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{ } loop>sequence ; inline
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<PRIVATE
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: (reverse) ( seq -- newseq )
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dup [ length ] keep new-sequence
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[ 0 swap copy-unsafe ] keep reverse! ;
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PRIVATE>
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: reverse-as ( seq exemplar -- newseq )
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[ (reverse) ] [ like ] bi* ;
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: map-product ( ... seq quot: ( ... elt -- ... n ) -- ... n )
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[ 1 ] 2dip [ dip * ] curry [ swap ] prepose each ; inline
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: insert-nth! ( elt n seq -- )
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[ length ] keep ensure swap pick (a,b]
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over '[ [ 1 + ] keep _ move-unsafe ] each
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set-nth-unsafe ;
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: set-nths ( value indices seq -- )
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swapd '[ _ swap _ set-nth ] each ; inline
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: set-nths-unsafe ( value indices seq -- )
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swapd '[ _ swap _ set-nth-unsafe ] each ; inline
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: flatten1 ( obj -- seq )
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[
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[
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dup branch? [
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[ dup branch? [ % ] [ , ] if ] each
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] [ , ] if
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]
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] keep dup branch? [ drop f ] unless make ;
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<PRIVATE
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: (map-find-index) ( seq quot find-quot -- result i elt )
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[ [ f ] 2dip [ [ nip ] 2dip call dup ] curry ] dip call
|
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[ [ [ drop f ] unless ] keep ] dip ; inline
|
|
|
|
PRIVATE>
|
|
|
|
: map-find-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
|
|
[ find-index ] (map-find-index) ; inline
|
|
|
|
: filter-length ( seq n -- seq' ) '[ length _ = ] filter ;
|
|
|
|
: all-shortest ( seqs -- seqs' ) dup shortest length filter-length ;
|
|
|
|
: all-longest ( seqs -- seqs' ) dup longest length filter-length ;
|
|
|
|
: remove-first ( obj seq -- seq' )
|
|
[ index ] keep over [ remove-nth ] [ nip ] if ;
|
|
|
|
: remove-first! ( obj seq -- seq )
|
|
[ index ] keep over [ remove-nth! ] [ nip ] if ;
|
|
|
|
: remove-last ( obj seq -- seq' )
|
|
[ last-index ] keep over [ remove-nth ] [ nip ] if ;
|
|
|
|
: remove-last! ( obj seq -- seq )
|
|
[ last-index ] keep over [ remove-nth! ] [ nip ] if ;
|
|
|
|
: ?first2 ( seq -- first/f second/f )
|
|
dup length {
|
|
{ 0 [ drop f f ] }
|
|
{ 1 [ first-unsafe f ] }
|
|
[ drop first2-unsafe ]
|
|
} case ;
|
|
|
|
: ?first3 ( seq -- first/f second/f third/f )
|
|
dup length {
|
|
{ 0 [ drop f f f ] }
|
|
{ 1 [ first-unsafe f f ] }
|
|
{ 2 [ first2-unsafe f ] }
|
|
[ drop first3-unsafe ]
|
|
} case ;
|
|
|
|
: ?first4 ( seq -- first/f second/f third/f fourth/f )
|
|
dup length {
|
|
{ 0 [ drop f f f f ] }
|
|
{ 1 [ first-unsafe f f f ] }
|
|
{ 2 [ first2-unsafe f f ] }
|
|
{ 3 [ first3-unsafe f ] }
|
|
[ drop first4-unsafe ]
|
|
} case ;
|
|
|
|
: cut-when ( ... seq quot: ( ... elt -- ... ? ) -- ... before after )
|
|
[ find drop ] 2keep drop swap
|
|
[ cut ] [ f over like ] if* ; inline
|
|
|
|
: nth* ( n seq -- elt )
|
|
[ length 1 - swap - ] [ nth ] bi ; inline
|
|
|
|
: each-index-from ( ... seq quot: ( ... elt index -- ... ) i -- ... )
|
|
-rot (each-index) (each-integer) ; inline
|
|
|
|
<PRIVATE
|
|
|
|
: select-by* ( ... seq quot: ( ... elt -- ... x ) compare: ( obj1 obj2 -- ? ) -- ... i elt )
|
|
[
|
|
[ keep swap ] curry [ dip ] curry
|
|
[ [ first 0 ] dip call ] 2keep
|
|
[ 2curry 3dip 5 npick pick ] curry
|
|
] [
|
|
[ [ 3drop ] [ [ 3drop ] 3dip ] if ] compose
|
|
] bi* compose 1 each-index-from nip swap ; inline
|
|
|
|
PRIVATE>
|
|
|
|
: supremum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
|
|
[ after? ] select-by* ; inline
|
|
|
|
: infimum-by* ( ... seq quot: ( ... elt -- ... x ) -- ... i elt )
|
|
[ before? ] select-by* ; inline
|
|
|
|
: ?supremum ( seq/f -- elt/f )
|
|
[ f ] [
|
|
[ ] [ 2dup and [ max ] [ dupd ? ] if ] map-reduce
|
|
] if-empty ;
|
|
|
|
: ?infimum ( seq/f -- elt/f )
|
|
[ f ] [
|
|
[ ] [ 2dup and [ min ] [ dupd ? ] if ] map-reduce
|
|
] if-empty ;
|
|
|
|
: change-last ( seq quot -- )
|
|
[ drop length 1 - ] [ change-nth ] 2bi ; inline
|
|
|
|
: change-last-unsafe ( seq quot -- )
|
|
[ drop length 1 - ] [ change-nth-unsafe ] 2bi ; inline
|
|
|
|
: replicate-into ( ... seq quot: ( ... -- ... newelt ) -- ... )
|
|
over [ length ] 2dip '[ _ dip _ set-nth-unsafe ] each-integer ; inline
|
|
|
|
: count* ( ... seq quot: ( ... elt -- ... ? ) -- ... % )
|
|
over [ count ] [ length ] bi* / ; inline
|
|
|
|
: find-last-index ( ... seq quot: ( ... elt i -- ... ? ) -- ... i elt )
|
|
[ [ 1 - ] dip find-last-integer ] (find-index) ; inline
|
|
|
|
: map-find-last-index ( ... seq quot: ( ... elt index -- ... result/f ) -- ... result i elt )
|
|
[ find-last-index ] (map-find-index) ; inline
|
|
|
|
:: (start-all) ( subseq seq increment -- indices )
|
|
0
|
|
[ [ subseq seq ] dip subseq-start-from dup ]
|
|
[ [ increment + ] keep ] produce nip ;
|
|
|
|
: start-all ( subseq seq -- indices )
|
|
over length (start-all) ; inline
|
|
|
|
: start-all* ( subseq seq -- indices )
|
|
1 (start-all) ; inline
|
|
|
|
: count-subseq ( subseq seq -- n )
|
|
start-all length ; inline
|
|
|
|
: count-subseq* ( subseq seq -- n )
|
|
start-all* length ; inline
|
|
|
|
: map-zip ( quot: ( x -- y ) -- alist )
|
|
'[ _ keep swap ] map>alist ; inline
|
|
|
|
: map-keys ( assoc quot: ( key -- key' ) -- assoc )
|
|
'[ _ dip ] assoc-map ; inline
|
|
|
|
: map-values ( assoc quot: ( value -- value' ) -- assoc )
|
|
'[ swap _ dip swap ] assoc-map ; inline
|
|
|
|
: take-while ( ... seq quot: ( ... elt -- ... ? ) -- head-slice )
|
|
[ '[ @ not ] find drop ] 2keep drop swap
|
|
[ dup length ] unless* head-slice ; inline
|
|
|
|
: drop-while ( ... seq quot: ( ... elt -- ... ? ) -- tail-slice )
|
|
[ '[ @ not ] find drop ] 2keep drop swap
|
|
[ dup length ] unless* tail-slice ; inline
|