5 module Puppet::Parser::Functions
6 newfunction(:shuffle, :type => :rvalue, :doc => <<-EOS
7 Randomizes the order of a string or array elements.
11 raise(Puppet::ParseError, "shuffle(): Wrong number of arguments " +
12 "given (#{arguments.size} for 1)") if arguments.size < 1
16 unless value.is_a?(Array) || value.is_a?(String)
17 raise(Puppet::ParseError, 'shuffle(): Requires either ' +
18 'array or string to work with')
23 string = value.is_a?(String) ? true : false
25 # Check whether it makes sense to shuffle ...
26 return result if result.size <= 1
28 # We turn any string value into an array to be able to shuffle ...
29 result = string ? result.split('') : result
31 elements = result.size
33 # Simple implementation of Fisher–Yates in-place shuffle ...
35 j = rand(elements - i) + i
36 result[j], result[i] = result[i], result[j]
39 result = string ? result.join : result
45 # vim: set ts=2 sw=2 et :