class IDL::AST::Annotation

def initialize(id, fields = {})
  @id = id.to_sym
  # copy field map transforming all keys to symbols and
  # detecting nested annotation objects
  @fields = fields.inject({}) do |m, (k, v)|
      m[k.to_sym] = case v
          when Array
            v.collect { |ve| Hash === ve ? Annotation.new(*ve.to_a.first) : ve }
          when Hash
            Annotation.new(*v.to_a.first)
          else
            v
        end
      m
    end
end