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#
# shuffle.rb
#
module Puppet::Parser::Functions
newfunction(:shuffle, :type => :rvalue, :doc => <<-EOS
Randomizes the order of a string or array elements.
EOS
) do |arguments|
raise(Puppet::ParseError, "shuffle(): Wrong number of arguments " +
"given (#{arguments.size} for 1)") if arguments.size < 1
value = arguments[0]
unless value.is_a?(Array) || value.is_a?(String)
raise(Puppet::ParseError, 'shuffle(): Requires either ' +
'array or string to work with')
end
result = value.clone
string = value.is_a?(String) ? true : false
# Check whether it makes sense to shuffle ...
return result if result.size <= 1
# We turn any string value into an array to be able to shuffle ...
result = string ? result.split('') : result
elements = result.size
# 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
result = string ? result.join : result
return result
end
end
# vim: set ts=2 sw=2 et :
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