1 ! Copyright (C) 2007, 2008 Chris Double, Doug Coleman, Eduardo
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2 ! Cavazos, Slava Pestov.
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3 ! See http://factorcode.org/license.txt for BSD license.
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4 USING: kernel sequences sequences.private namespaces math
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5 math.ranges combinators macros quotations fry arrays ;
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8 MACRO: nsequence ( n seq -- quot )
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9 [ drop <reversed> ] [ '[ _ _ new-sequence ] ] 2bi
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10 [ '[ @ [ _ swap set-nth-unsafe ] keep ] ] reduce ;
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12 MACRO: narray ( n -- quot )
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13 '[ _ { } nsequence ] ;
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15 MACRO: firstn ( n -- )
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16 dup zero? [ drop [ drop ] ] [
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17 [ [ '[ [ _ ] dip nth-unsafe ] ] map ]
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18 [ 1- '[ [ _ ] dip bounds-check 2drop ] ]
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19 bi prefix '[ _ cleave ]
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22 MACRO: npick ( n -- )
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23 1- dup saver [ dup ] rot [ r> swap ] n*quot 3append ;
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25 MACRO: ndup ( n -- )
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26 dup '[ _ npick ] n*quot ;
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28 MACRO: nrot ( n -- )
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29 1- dup saver swap [ r> swap ] n*quot append ;
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31 MACRO: -nrot ( n -- )
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32 1- dup [ swap >r ] n*quot swap restorer append ;
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34 MACRO: ndrop ( n -- )
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38 swap >r ndrop r> ; inline
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40 MACRO: ntuck ( n -- )
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41 2 + [ dupd -nrot ] curry ;
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43 MACRO: nrev ( n -- quot )
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44 1 [a,b] [ ] [ '[ @ _ -nrot ] ] reduce ;
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46 MACRO: ndip ( quot n -- )
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47 dup saver -rot restorer 3append ;
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49 MACRO: nslip ( n -- )
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50 dup saver [ call ] rot restorer 3append ;
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52 MACRO: nkeep ( n -- )
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54 '[ [ _ ndup ] dip _ -nrot _ nslip ] ;
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56 MACRO: ncurry ( n -- )
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59 MACRO: nwith ( n -- )
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62 MACRO: napply ( n -- )
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64 [ [ 1- ] keep '[ _ ntuck _ nslip ] ]
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65 map concat >quotation [ call ] append ;
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