GetoptLong#set_options

# File tmp/rubies/ruby-3.1.3/lib/getoptlong.rb, line 274
def set_options(*arguments)
  #
  # The method is failed if option processing has already started.
  #
  if @status != STATUS_YET
    raise RuntimeError,
      "invoke set_options, but option processing has already started"
  end

  #
  # Clear tables of option names and argument flags.
  #
  @canonical_names.clear
  @argument_flags.clear

  arguments.each do |arg|
    if !arg.is_a?(Array)
     raise ArgumentError, "the option list contains non-Array argument"
    end

    #
    # Find an argument flag and it set to `argument_flag'.
    #
    argument_flag = nil
    arg.each do |i|
      if ARGUMENT_FLAGS.include?(i)
        if argument_flag != nil
          raise ArgumentError, "too many argument-flags"
        end
        argument_flag = i
      end
    end

    raise ArgumentError, "no argument-flag" if argument_flag == nil

    canonical_name = nil
    arg.each do |i|
      #
      # Check an option name.
      #
      next if i == argument_flag
      begin
        if !i.is_a?(String) || i !~ /\A-([^-]|-.+)\z/
          raise ArgumentError, "an invalid option `#{i}'"
        end
        if (@canonical_names.include?(i))
          raise ArgumentError, "option redefined `#{i}'"
        end
      rescue
        @canonical_names.clear
        @argument_flags.clear
        raise
      end

      #
      # Register the option (`i') to the `@canonical_names' and
      # `@canonical_names' Hashes.
      #
      if canonical_name == nil
        canonical_name = i
      end
      @canonical_names[i] = canonical_name
      @argument_flags[i] = argument_flag
    end
    raise ArgumentError, "no option name" if canonical_name == nil
  end
  return self
end