103 lines
1.9 KiB
Plaintext
103 lines
1.9 KiB
Plaintext
import ../stdlib/stdlib.sl
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import ../stdlib/io.sl
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import ../stdlib/arr.sl
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# Get element from static array, preserving the array pointer
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# [*, arr | i] -> [*, arr | value]
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word aget
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over swap arr_get
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end
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# Set element in static array, preserving the array pointer
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# [*, arr, value | i] -> [* | arr]
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word aset
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rot dup >r -rot arr_set r>
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end
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# Swap elements at indices i and j in a static array
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# [*, arr, i | j] -> [* | arr]
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word arr_swap
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>r >r
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0 rpick aget
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swap
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1 rpick aget
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0 rpick aset
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swap
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1 rpick aset
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rdrop rdrop
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end
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# Lomuto partition (ascending, signed comparison)
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# [*, arr, lo | hi] -> [*, arr | pivot_index]
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word partition
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>r >r
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1 rpick aget
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>r
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1 rpick dec
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1 rpick
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while dup 2 rpick < do
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2 pick over aget nip
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0 rpick <=
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if
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swap inc swap
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2 pick 2 pick 2 pick arr_swap drop
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end
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inc
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end
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drop inc
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over over 2 rpick arr_swap drop
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rdrop rdrop rdrop
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end
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# Recursive quicksort
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# [*, arr, lo | hi] -> [* | arr]
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word qsort_rec
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over over >= if
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drop drop
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else
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>r >r
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0 rpick 1 rpick
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partition
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over 0 rpick
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2 pick dec
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qsort_rec
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drop
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over swap inc
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1 rpick
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qsort_rec
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drop
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rdrop rdrop
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end
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end
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# Quicksort for static arrays (in-place, ascending)
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# [* | arr] -> [* | arr]
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word arr_qsort
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dup @ dec
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dup 0 < if
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drop
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else
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>r dup 0 r>
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qsort_rec
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end
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end
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# Print all elements of a static array, one per line
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word print_arr
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dup @ 0
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while 2dup > do
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2 pick over arr_get puti cr
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1 +
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end
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2drop drop
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end
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word main
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[ 5 3 8 1 7 2 6 4 ] arr_qsort print_arr
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[ 1 2 3 4 5 ] arr_qsort print_arr
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[ 9 7 5 3 1 ] arr_qsort print_arr
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[ 42 ] arr_qsort print_arr
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[ 3 1 4 1 5 9 2 6 5 3 ] arr_qsort print_arr
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[ 20 10 ] arr_qsort print_arr
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end
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