class Mail::Parsers::ReceivedParser

def parse(s)
  actions, error = Ragel.parse(:received, s)
  if error
    raise Mail::Field::ParseError.new(Mail::ReceivedElement, s, error)
  end
  received = ReceivedStruct.new
  received_tokens_s = date_s = time_s = nil
  actions.each_slice(2) do |action_id, p|
    action = Mail::Parsers::Ragel::ACTIONS[action_id]
    case action
    # Received Tokens:
    when :received_tokens_s then received_tokens_s = p
    when :received_tokens_e
      received.info = s[received_tokens_s..(p-1)]
    # Date
    when :date_s then date_s = p
    when :date_e
      received.date = s[date_s..(p-1)].strip
    # Time
    when :time_s then time_s = p
    when :time_e
      received.time = s[time_s..(p-1)]
    when :angle_addr_s, :comment_e, :comment_s,
         :domain_e, :domain_s, :local_dot_atom_e,
         :local_dot_atom_pre_comment_e,
         :local_dot_atom_pre_comment_s,
         :local_dot_atom_s, :qstr_e, :qstr_s,
         :local_quoted_string_s, :local_quoted_string_e
      # ignored actions
    else
      raise Mail::Field::ParseError.new(Mail::ReceivedElement, s, "Failed to process unknown action: #{action}")
    end
  end
  received
end