downcase.rb

#
#  downcase.rb
#  Please note: This function is an implementation of a Ruby class and as such may not be entirely UTF8 compatible. To ensure compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
#
module Puppet::Parser::Functions
  newfunction(:downcase, :type => :rvalue, :doc => <<-DOC
    Converts the case of a string or all strings in an array to lower case.

    Note: from Puppet 6.0.0, the compatible function with the same name in Puppet core
    will be used instead of this function.
  DOC
             ) do |arguments|

    raise(Puppet::ParseError, "downcase(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.empty?

    value = arguments[0]

    unless value.is_a?(Array) || value.is_a?(String)
      raise(Puppet::ParseError, 'downcase(): Requires either array or string to work with')
    end

    result = if value.is_a?(Array)
               # Numbers in Puppet are often string-encoded which is troublesome ...
               value.map { |i| i.is_a?(String) ? i.downcase : i }
             else
               value.downcase
             end

    return result
  end
end

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