get

# File lib/getoptlong.rb, line 427
 def get
 option_name, option_argument = nil, ''
 #
 # Check status.
 #
 return nil if @error != nil
 case @status
 when STATUS_YET
 @status = STATUS_STARTED
 when STATUS_TERMINATED
 return nil
 end
 #
 # Get next option argument.
 #
 if 0 < @rest_singles.length
 argument = '-' + @rest_singles
 elsif (ARGV.length == 0)
 terminate
 return nil
 elsif @ordering == PERMUTE
 while 0 < ARGV.length && ARGV[0] !~ /\A-./
 @non_option_arguments.push(ARGV.shift)
 end
 if ARGV.length == 0
 terminate
 return nil
 end
 argument = ARGV.shift
 elsif @ordering == REQUIRE_ORDER
 if (ARGV[0] !~ /\A-./)
 terminate
 return nil
 end
 argument = ARGV.shift
 else
 argument = ARGV.shift
 end
 #
 # Check the special argument `--'.
 # `--' indicates the end of the option list.
 #
 if argument == '--' && @rest_singles.length == 0
 terminate
 return nil
 end
 #
 # Check for long and short options.
 #
 if argument =~ /\A(--[^=]+)/ && @rest_singles.length == 0
 #
 # This is a long style option, which start with `--'.
 #
 pattern = 1ドル
 if @canonical_names.include?(pattern)
 option_name = pattern
 else
 #
 # The option `option_name' is not registered in `@canonical_names'.
 # It may be an abbreviated.
 #
 matches = []
 @canonical_names.each_key do |key|
 if key.index(pattern) == 0
 option_name = key
 matches << key
 end
 end
 if 2 <= matches.length
 set_error(AmbiguousOption, "option `#{argument}' is ambiguous between #{matches.join(', ')}")
 elsif matches.length == 0
 set_error(InvalidOption, "unrecognized option `#{argument}'")
 end
 end
 #
 # Check an argument to the option.
 #
 if @argument_flags[option_name] == REQUIRED_ARGUMENT
 if argument =~ /=(.*)/
 option_argument = 1ドル
 elsif 0 < ARGV.length
 option_argument = ARGV.shift
 else
 set_error(MissingArgument,
 "option `#{argument}' requires an argument")
 end
 elsif @argument_flags[option_name] == OPTIONAL_ARGUMENT
 if argument =~ /=(.*)/
 option_argument = 1ドル
 elsif 0 < ARGV.length && ARGV[0] !~ /\A-./
 option_argument = ARGV.shift
 else
 option_argument = ''
 end
 elsif argument =~ /=(.*)/
 set_error(NeedlessArgument,
 "option `#{option_name}' doesn't allow an argument")
 end
 elsif argument =~ /\A(-(.))(.*)/
 #
 # This is a short style option, which start with `-' (not `--').
 # Short options may be catenated (e.g. `-l -g' is equivalent to
 # `-lg').
 #
 option_name, ch, @rest_singles = 1,ドル 2,ドル 3ドル
 if @canonical_names.include?(option_name)
 #
 # The option `option_name' is found in `@canonical_names'.
 # Check its argument.
 #
 if @argument_flags[option_name] == REQUIRED_ARGUMENT
 if 0 < @rest_singles.length
 option_argument = @rest_singles
 @rest_singles = ''
 elsif 0 < ARGV.length
 option_argument = ARGV.shift
 else
 # 1003.2 specifies the format of this message.
 set_error(MissingArgument, "option requires an argument -- #{ch}")
 end
 elsif @argument_flags[option_name] == OPTIONAL_ARGUMENT
 if 0 < @rest_singles.length
 option_argument = @rest_singles
 @rest_singles = ''
 elsif 0 < ARGV.length && ARGV[0] !~ /\A-./
 option_argument = ARGV.shift
 else
 option_argument = ''
 end
 end
 else
 #
 # This is an invalid option.
 # 1003.2 specifies the format of this message.
 #
 if ENV.include?('POSIXLY_CORRECT')
 set_error(InvalidOption, "invalid option -- #{ch}")
 else
 set_error(InvalidOption, "invalid option -- #{ch}")
 end
 end
 else
 #
 # This is a non-option argument.
 # Only RETURN_IN_ORDER fell into here.
 #
 return '', argument
 end
 return @canonical_names[option_name], option_argument
 end