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update partition

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primo-ppcg 2023-09-08 12:38:58 +07:00
parent 541469371a
commit a7536268e1
1 changed files with 18 additions and 10 deletions
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28
src/boot/boot.janet
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@ -1735,20 +1735,28 @@
ret))
@[]))
(defn- partition-slice
[f n ind]
(var [start end] [0 n])
(def len (length ind))
(def parts (div len n))
(def ret (array/new-filled parts))
(forv k 0 parts
(put ret k (f ind start end))
(set start end)
(+= end n))
(if (< start len)
(array/push ret (f ind start)))
ret)
(defn partition
``Partition an indexed data structure `ind` into tuples
of size `n`. Returns a new array.``
[n ind]
(var i 0) (var nextn n)
(def len (length ind))
(def ret (array/new (math/ceil (/ len n))))
(def slicer (if (bytes? ind) string/slice tuple/slice))
(while (<= nextn len)
(array/push ret (slicer ind i nextn))
(set i nextn)
(+= nextn n))
(if (not= i len) (array/push ret (slicer ind i)))
ret)
(cond
(indexed? ind) (partition-slice tuple/slice n ind)
(bytes? ind) (partition-slice string/slice n ind)
(partition-slice tuple/slice n (values ind))))
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