43 lines
1.2 KiB
Factor
43 lines
1.2 KiB
Factor
! Copyright (C) 2007 Daniel Ehrenberg.
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! See http://factorcode.org/license.txt for BSD license.
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USING: splitting classes.tuple classes math kernel sequences
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arrays ;
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IN: tuple-arrays
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TUPLE: tuple-array example ;
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: prepare-example ( tuple -- seq n )
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dup class over delegate [ 1array ] [ f 2array ] if
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swap tuple>array length over length - ;
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: <tuple-array> ( length example -- tuple-array )
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prepare-example [ rot * { } new-sequence ] keep
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<sliced-groups> tuple-array construct-delegate
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[ set-tuple-array-example ] keep ;
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: reconstruct ( seq example -- tuple )
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prepend >tuple ;
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M: tuple-array nth
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[ delegate nth ] keep
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tuple-array-example reconstruct ;
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: deconstruct ( tuple example -- seq )
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>r tuple>array r> length tail-slice ;
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M: tuple-array set-nth ( elt n seq -- )
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tuck >r >r tuple-array-example deconstruct r> r>
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delegate set-nth ;
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M: tuple-array new-sequence tuple-array-example >tuple <tuple-array> ;
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: >tuple-array ( seq -- tuple-array/seq )
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dup empty? [
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0 over first <tuple-array> clone-like
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] unless ;
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M: tuple-array like
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drop dup tuple-array? [ >tuple-array ] unless ;
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INSTANCE: tuple-array sequence
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