puppetlabs-stdlib/lib/puppet/parser/functions/bool2str.rb

#
# bool2str.rb
#

module Puppet::Parser::Functions
  newfunction(:bool2str, :type => :rvalue, :doc => <<-EOS
    Converts a boolean to a string.
    Requires a single boolean as an input.
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "bool2str(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size < 1

    value = arguments[0]
    klass = value.class

    # We can have either true or false, and nothing else
    unless [FalseClass, TrueClass].include?(klass)
      raise(Puppet::ParseError, 'bool2str(): Requires a boolean to work with')
    end

    return value.to_s
  end
end

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