any2array.rb

#
# any2array.rb
#
module Puppet::Parser::Functions
  newfunction(:any2array, :type => :rvalue, :doc => <<-DOC
    This converts any object to an array containing that object. Empty argument
    lists are converted to an empty array. Arrays are left untouched. Hashes are
    converted to arrays of alternating keys and values.

    Note that since Puppet 5.0.0 it is possible to create new data types for almost any
    datatype using the type system and the built-in
    [`Array.new`](https://puppet.com/docs/puppet/latest/function.html#conversion-to-array-and-tuple)
    function is used to create a new Array..

        $hsh = {'key' => 42, 'another-key' => 100}
        notice(Array($hsh))

    Would notice `[['key', 42], ['another-key', 100]]`

    The Array data type also has a special mode to "create an array if not already an array"

        notice(Array({'key' => 42, 'another-key' => 100}, true))

    Would notice `[{'key' => 42, 'another-key' => 100}]`, as the `true` flag prevents the hash from being
    transformed into an array.
  DOC
             ) do |arguments|

    if arguments.empty?
      return []
    end

    return arguments unless arguments.length == 1
    return arguments[0] if arguments[0].is_a?(Array)
    if arguments[0].is_a?(Hash)
      result = []
      arguments[0].each do |key, value|
        result << key << value
      end
      return result
    end
    return arguments
  end
end

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