blob: 33c32bb3d3e646dde97b4ee4f6ce2a2500696f2b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
#
# shuffle.rb
#
# TODO(Krzysztof Wilczynski): Support for strings would be nice too ...
module Puppet::Parser::Functions
newfunction(:shuffle, :type => :rvalue, :doc => <<-EOS
EOS
) do |arguments|
raise(Puppet::ParseError, "shuffle(): Wrong number of arguments " +
"given (#{arguments.size} for 1)") if arguments.size < 1
array = arguments[0]
if not array.is_a?(Array)
raise(Puppet::ParseError, 'shuffle(): Requires an array to work with')
end
result = array.clone
elements = result.size
return [] if result.size == 0
return result if result.size <= 1
# Simple implementation of Fisher–Yates in-place shuffle ...
elements.times do |i|
j = rand(elements - i) + i
result[j], result[i] = result[i], result[j]
end
return result
end
end
# vim: set ts=2 sw=2 et :
|
