Puppet Function: join_keys_to_values

Defined in:
puppet/modules/stdlib/lib/puppet/parser/functions/join_keys_to_values.rb
Function type:
Ruby 3.x API

Overview

join_keys_to_values() ⇒ Any

This function joins each key of a hash to that key's corresponding value with a separator. Keys are cast to strings. If values are arrays, multiple keys are added for each element. The return value is an array in which each element is one joined key/value pair.

Examples:

join_keys_to_values({'a'=>1,'b'=>2}, " is ")

Would result in: [“a is 1”,“b is 2”]

join_keys_to_values({'a'=>1,'b'=>[2,3]}, " is ")

Would result in: [“a is 1”,“b is 2”,“b is 3”]

Returns:

  • (Any) 


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# File 'puppet/modules/stdlib/lib/puppet/parser/functions/join_keys_to_values.rb', line 6

newfunction(:join_keys_to_values, :type => :rvalue, :doc => <<-EOS
This function joins each key of a hash to that key's corresponding value with a
separator. Keys are cast to strings. If values are arrays, multiple keys
are added for each element. The return value is an array in
which each element is one joined key/value pair.

*Examples:*

  join_keys_to_values({'a'=>1,'b'=>2}, " is ")

Would result in: ["a is 1","b is 2"]

  join_keys_to_values({'a'=>1,'b'=>[2,3]}, " is ")

Would result in: ["a is 1","b is 2","b is 3"]
  EOS
) do |arguments|

  # Validate the number of arguments.
  if arguments.size != 2
    raise(Puppet::ParseError, "join_keys_to_values(): Takes exactly two " +
          "arguments, but #{arguments.size} given.")
  end

  # Validate the first argument.
  hash = arguments[0]
  if not hash.is_a?(Hash)
    raise(TypeError, "join_keys_to_values(): The first argument must be a " +
          "hash, but a #{hash.class} was given.")
  end

  # Validate the second argument.
  separator = arguments[1]
  if not separator.is_a?(String)
    raise(TypeError, "join_keys_to_values(): The second argument must be a " +
          "string, but a #{separator.class} was given.")
  end

  # Join the keys to their values.
  hash.map do |k,v|
    if v.is_a?(Array)
      v.map { |va| String(k) + separator + String(va) }
    else
      String(k) + separator + String(v)
    end
  end.flatten

end