5da2005d04
name change for simplicity. Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
45 lines
1 KiB
Ruby
45 lines
1 KiB
Ruby
#
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# shuffle.rb
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#
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module Puppet::Parser::Functions
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newfunction(:shuffle, :type => :rvalue, :doc => <<-EOS
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EOS
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) do |arguments|
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raise(Puppet::ParseError, "shuffle(): Wrong number of arguments " +
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"given (#{arguments.size} for 1)") if arguments.size < 1
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value = arguments[0]
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klass = value.class
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unless [Array, String].include?(klass)
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raise(Puppet::ParseError, 'shuffle(): Requires either ' +
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'array or string to work with')
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end
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result = value.clone
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string = value.is_a?(String) ? true : false
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# Check whether it makes sense to shuffle ...
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return result if result.size <= 1
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# We turn any string value into an array to be able to shuffle ...
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result = string ? result.split('') : result
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elements = result.size
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# Simple implementation of Fisher–Yates in-place shuffle ...
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elements.times do |i|
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j = rand(elements - i) + i
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result[j], result[i] = result[i], result[j]
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end
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result = string ? result.join : result
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return result
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end
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end
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# vim: set ts=2 sw=2 et :
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