puppetlabs-stdlib/lib/puppet/parser/functions/reverse.rb

#
# reverse.rb
#

module Puppet::Parser::Functions
  newfunction(:reverse, :type => :rvalue, :doc => <<-EOS
Reverses the order of a string or array.
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "reverse(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size < 1

    value = arguments[0]
    klass = value.class

    unless [Array, String].include?(klass)
      raise(Puppet::ParseError, 'reverse(): Requires either ' +
        'array or string to work with')
    end

    result = value.reverse

    return result
  end
end

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