# frozen_string_literal: true require ‘mail/utilities’ require ‘mail/parser_tools’

begin

original_verbose, $VERBOSE = $VERBOSE, nil

%%{

# RFC 5322 Section 3.6.4: Identification Fields
# https://tools.ietf.org/html/rfc5322#section-3.6.4
machine message_ids;
alphtype int;

# Message Ids
action msg_id_s { msg_id_s = p }
action msg_id_e {
  id = chars(data, msg_id_s, p-1)
  id = $1 if id =~ /.*<(.*)>.*/
  message_ids.message_ids << id
}

# No-op actions
action angle_addr_s {}
action address_s {}
action address_e {}
action comment_e {}
action comment_s {}
action domain_e {}
action domain_s {}
action local_dot_atom_e {}
action local_dot_atom_pre_comment_e {}
action local_dot_atom_pre_comment_s {}
action local_dot_atom_s {}
action phrase_s {}
action phrase_e {}
action qstr_e {}
action qstr_s {}
action ctime_date_s {}
action ctime_date_e {}
action date_s {}
action date_e {}
action time_s {}
action time_e {}
action local_quoted_string_s {}
action local_quoted_string_e {}
action obs_domain_list_s {}
action obs_domain_list_e {}
action group_name_s {}
action group_name_e {}
action received_tokens_s {}
action received_tokens_e {}

include rfc5322 "rfc5322.rl";
main := message_ids;

}%%

module Mail::Parsers

module MessageIdsParser
  extend Mail::ParserTools

  MessageIdsStruct = Struct.new(:message_ids, :error)

  %%write data noprefix;

  def self.parse(data)
    data = data.dup.force_encoding(Encoding::ASCII_8BIT) if data.respond_to?(:force_encoding)

    raise Mail::Field::NilParseError.new(Mail::MessageIdsElement) if data.nil?

    # Parser state
    message_ids = MessageIdsStruct.new([])
    msg_id_s = nil

    # 5.1 Variables Used by Ragel
    p = 0
    eof = pe = data.length
    stack = []

    %%write init;
    %%write exec;

    if p != eof || cs < %%{ write first_final; }%%
      raise Mail::Field::IncompleteParseError.new(Mail::MessageIdsElement, data, p)
    end

    message_ids
  end
end

end

ensure

$VERBOSE = original_verbose

end