resp_text_code

# File lib/net/imap.rb, line 2891
      def resp_text_code
        @lex_state = EXPR_BEG
        match(T_LBRA)
        token = match(T_ATOM)
        name = token.value.upcase
        case name
        when /\A(?:ALERT|PARSE|READ-ONLY|READ-WRITE|TRYCREATE|NOMODSEQ)\z/
          result = ResponseCode.new(name, nil)
        when /\A(?:PERMANENTFLAGS)\z/
          match(T_SPACE)
          result = ResponseCode.new(name, flag_list)
        when /\A(?:UIDVALIDITY|UIDNEXT|UNSEEN)\z/
          match(T_SPACE)
          result = ResponseCode.new(name, number)
        else
          token = lookahead
          if token.symbol == T_SPACE
            shift_token
            @lex_state = EXPR_CTEXT
            token = match(T_TEXT)
            @lex_state = EXPR_BEG
            result = ResponseCode.new(name, token.value)
          else
            result = ResponseCode.new(name, nil)
          end
        end
        match(T_RBRA)
        @lex_state = EXPR_RTEXT
        return result
      end