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Edit File : getoptlong.rb \| Size : 15.38 KB
# # GetoptLong for Ruby # # Copyright (C) 1998, 1999, 2000 Motoyuki Kasahara. # # You may redistribute and/or modify this library under the same license # terms as Ruby. # # See GetoptLong for documentation. # # Additional documents and the latest version of `getoptlong.rb' can be # found at http://www.sra.co.jp/people/m-kasahr/ruby/getoptlong/ # The GetoptLong class allows you to parse command line options similarly to # the GNU getopt_long() C library call. Note, however, that GetoptLong is a # pure Ruby implementation. # # GetoptLong allows for POSIX-style options like <tt>--file</tt> as well # as single letter options like <tt>-f</tt> # # The empty option <tt>--</tt> (two minus symbols) is used to end option # processing. This can be particularly important if options have optional # arguments. # # Here is a simple example of usage: # # require 'getoptlong' # # opts = GetoptLong.new( # [ '--help', '-h', GetoptLong::NO_ARGUMENT ], # [ '--repeat', '-n', GetoptLong::REQUIRED_ARGUMENT ], # [ '--name', GetoptLong::OPTIONAL_ARGUMENT ] # ) # # dir = nil # name = nil # repetitions = 1 # opts.each do \|opt, arg\| # case opt # when '--help' # puts <<-EOF # hello [OPTION] ... DIR # # -h, --help: # show help # # --repeat x, -n x: # repeat x times # # --name [name]: # greet user by name, if name not supplied default is John # # DIR: The directory in which to issue the greeting. # EOF # when '--repeat' # repetitions = arg.to_i # when '--name' # if arg == '' # name = 'John' # else # name = arg # end # end # end # # if ARGV.length != 1 # puts "Missing dir argument (try --help)" # exit 0 # end # # dir = ARGV.shift # # Dir.chdir(dir) # for i in (1..repetitions) # print "Hello" # if name # print ", #{name}" # end # puts # end # # Example command line: # # hello -n 6 --name -- /tmp # class GetoptLong # # Orderings. # ORDERINGS = [REQUIRE_ORDER = 0, PERMUTE = 1, RETURN_IN_ORDER = 2] # # Argument flags. # ARGUMENT_FLAGS = [NO_ARGUMENT = 0, REQUIRED_ARGUMENT = 1, OPTIONAL_ARGUMENT = 2] # # Status codes. # STATUS_YET, STATUS_STARTED, STATUS_TERMINATED = 0, 1, 2 # # Error types. # class Error < StandardError; end class AmbiguousOption < Error; end class NeedlessArgument < Error; end class MissingArgument < Error; end class InvalidOption < Error; end # # Set up option processing. # # The options to support are passed to new() as an array of arrays. # Each sub-array contains any number of String option names which carry # the same meaning, and one of the following flags: # # GetoptLong::NO_ARGUMENT :: Option does not take an argument. # # GetoptLong::REQUIRED_ARGUMENT :: Option always takes an argument. # # GetoptLong::OPTIONAL_ARGUMENT :: Option may or may not take an argument. # # The first option name is considered to be the preferred (canonical) name. # Other than that, the elements of each sub-array can be in any order. # def initialize(arguments) # # Current ordering. # if ENV.include?('POSIXLY_CORRECT') @ordering = REQUIRE_ORDER else @ordering = PERMUTE end # # Hash table of option names. # Keys of the table are option names, and their values are canonical # names of the options. # @canonical_names = Hash.new # # Hash table of argument flags. # Keys of the table are option names, and their values are argument # flags of the options. # @argument_flags = Hash.new # # Whether error messages are output to $stderr. # @quiet = FALSE # # Status code. # @status = STATUS_YET # # Error code. # @error = nil # # Error message. # @error_message = nil # # Rest of catenated short options. # @rest_singles = '' # # List of non-option-arguments. # Append them to ARGV when option processing is terminated. # @non_option_arguments = Array.new if 0 < arguments.length set_options(arguments) end end # # Set the handling of the ordering of options and arguments. # A RuntimeError is raised if option processing has already started. # # The supplied value must be a member of GetoptLong::ORDERINGS. It alters # the processing of options as follows: # # <b>REQUIRE_ORDER</b> : # # Options are required to occur before non-options. # # Processing of options ends as soon as a word is encountered that has not # been preceded by an appropriate option flag. # # For example, if -a and -b are options which do not take arguments, # parsing command line arguments of '-a one -b two' would result in # 'one', '-b', 'two' being left in ARGV, and only ('-a', '') being # processed as an option/arg pair. # # This is the default ordering, if the environment variable # POSIXLY_CORRECT is set. (This is for compatibility with GNU getopt_long.) # # <b>PERMUTE</b> : # # Options can occur anywhere in the command line parsed. This is the # default behavior. # # Every sequence of words which can be interpreted as an option (with or # without argument) is treated as an option; non-option words are skipped. # # For example, if -a does not require an argument and -b optionally takes # an argument, parsing '-a one -b two three' would result in ('-a','') and # ('-b', 'two') being processed as option/arg pairs, and 'one','three' # being left in ARGV. # # If the ordering is set to PERMUTE but the environment variable # POSIXLY_CORRECT is set, REQUIRE_ORDER is used instead. This is for # compatibility with GNU getopt_long. # # <b>RETURN_IN_ORDER</b> : # # All words on the command line are processed as options. Words not # preceded by a short or long option flag are passed as arguments # with an option of '' (empty string). # # For example, if -a requires an argument but -b does not, a command line # of '-a one -b two three' would result in option/arg pairs of ('-a', 'one') # ('-b', ''), ('', 'two'), ('', 'three') being processed. # def ordering=(ordering) # # The method is failed if option processing has already started. # if @status != STATUS_YET set_error(ArgumentError, "argument error") raise RuntimeError, "invoke ordering=, but option processing has already started" end # # Check ordering. # if !ORDERINGS.include?(ordering) raise ArgumentError, "invalid ordering `#{ordering}'" end if ordering == PERMUTE && ENV.include?('POSIXLY_CORRECT') @ordering = REQUIRE_ORDER else @ordering = ordering end end # # Return ordering. # attr_reader :ordering # # Set options. Takes the same argument as GetoptLong.new. # # Raises a RuntimeError if option processing has already started. # 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 !~ /^-([^-]\|-.+)$/ 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 # # Set/Unset `quiet' mode. # attr_writer :quiet # # Return the flag of `quiet' mode. # attr_reader :quiet # # `quiet?' is an alias of `quiet'. # alias quiet? quiet # # Explicitly terminate option processing. # def terminate return nil if @status == STATUS_TERMINATED raise RuntimeError, "an error has occurred" if @error != nil @status = STATUS_TERMINATED @non_option_arguments.reverse_each do \|argument\| ARGV.unshift(argument) end @canonical_names = nil @argument_flags = nil @rest_singles = nil @non_option_arguments = nil return self end # # Returns true if option processing has terminated, false otherwise. # def terminated? return @status == STATUS_TERMINATED end # # Set an error (a protected method). # def set_error(type, message) $stderr.print("#{$0}: #{message}\n") if !@quiet @error = type @error_message = message @canonical_names = nil @argument_flags = nil @rest_singles = nil @non_option_arguments = nil raise type, message end protected :set_error # # Examine whether an option processing is failed. # attr_reader :error # # `error?' is an alias of `error'. # alias error? error # Return the appropriate error message in POSIX-defined format. # If no error has occurred, returns nil. # def error_message return @error_message end # # Get next option name and its argument, as an Array of two elements. # # The option name is always converted to the first (preferred) # name given in the original options to GetoptLong.new. # # Example: ['--option', 'value'] # # Returns nil if the processing is complete (as determined by # STATUS_TERMINATED). # 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] !~ /^-./ @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] !~ /^-./) 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 =~ /^(--[^=]+)/ && @rest_singles.length == 0 # # This is a long style option, which start with `--'. # pattern = $1 if @canonical_names.include?(pattern) option_name = pattern else # # The option `option_name' is not registered in `@canonical_names'. # It may be an abbreviated. # matches = [] @canonical_names.each_key do \|key\| if key.index(pattern) == 0 option_name = key matches << key end end if 2 <= matches.length set_error(AmbiguousOption, "option `#{argument}' is ambiguous between #{matches.join(', ')}") elsif matches.length == 0 set_error(InvalidOption, "unrecognized option `#{argument}'") end end # # Check an argument to the option. # if @argument_flags[option_name] == REQUIRED_ARGUMENT if argument =~ /=(.)$/ option_argument = $1 elsif 0 < ARGV.length option_argument = ARGV.shift else set_error(MissingArgument, "option `#{argument}' requires an argument") end elsif @argument_flags[option_name] == OPTIONAL_ARGUMENT if argument =~ /=(.)$/ option_argument = $1 elsif 0 < ARGV.length && ARGV[0] !~ /^-./ option_argument = ARGV.shift else option_argument = '' end elsif argument =~ /=(.)$/ set_error(NeedlessArgument, "option `#{option_name}' doesn't allow an argument") end elsif argument =~ /^(-(.))(.*)/ # # 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, $2, $3 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] !~ /^-./ 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 falled into here. # return '', argument end return @canonical_names[option_name], option_argument end # # `get_option' is an alias of `get'. # alias get_option get # Iterator version of `get'. # # The block is called repeatedly with two arguments: # The first is the option name. # The second is the argument which followed it (if any). # Example: ('--opt', 'value') # # The option name is always converted to the first (preferred) # name given in the original options to GetoptLong.new. # def each loop do option_name, option_argument = get_option break if option_name == nil yield option_name, option_argument end end # # `each_option' is an alias of `each'. # alias each_option each end Back

Edit File : getoptlong.rb | Size : 15.38 KB

#
# GetoptLong for Ruby
#
# Copyright (C) 1998, 1999, 2000  Motoyuki Kasahara.
#
# You may redistribute and/or modify this library under the same license
# terms as Ruby.
#
# See GetoptLong for documentation.
#
# Additional documents and the latest version of `getoptlong.rb' can be
# found at http://www.sra.co.jp/people/m-kasahr/ruby/getoptlong/

# The GetoptLong class allows you to parse command line options similarly to
# the GNU getopt_long() C library call. Note, however, that GetoptLong is a
# pure Ruby implementation.
#
# GetoptLong allows for POSIX-style options like <tt>--file</tt> as well
# as single letter options like <tt>-f</tt>
#
# The empty option <tt>--</tt> (two minus symbols) is used to end option
# processing. This can be particularly important if options have optional
# arguments.
#
# Here is a simple example of usage:
#
# require 'getoptlong'
#
# opts = GetoptLong.new(
# [ '--help', '-h', GetoptLong::NO_ARGUMENT ],
# [ '--repeat', '-n', GetoptLong::REQUIRED_ARGUMENT ],
# [ '--name', GetoptLong::OPTIONAL_ARGUMENT ]
# )
#
# dir = nil
# name = nil
# repetitions = 1
# opts.each do |opt, arg|
# case opt
# when '--help'
# puts <<-EOF
# hello [OPTION] ... DIR
#
# -h, --help:
# show help
#
# --repeat x, -n x:
# repeat x times
#
# --name [name]:
# greet user by name, if name not supplied default is John
#
# DIR: The directory in which to issue the greeting.
# EOF
# when '--repeat'
# repetitions = arg.to_i
# when '--name'
# if arg == ''
# name = 'John'
# else
# name = arg
# end
# end
# end
#
# if ARGV.length != 1
# puts "Missing dir argument (try --help)"
# exit 0
# end
#
# dir = ARGV.shift
#
# Dir.chdir(dir)
# for i in (1..repetitions)
# print "Hello"
# if name
# print ", #{name}"
# end
# puts
# end
#
# Example command line:
#
# hello -n 6 --name -- /tmp
#
class GetoptLong
 #
 # Orderings.
 #
 ORDERINGS = [REQUIRE_ORDER = 0, PERMUTE = 1, RETURN_IN_ORDER = 2]

#
  # Argument flags.
  #
  ARGUMENT_FLAGS = [NO_ARGUMENT = 0, REQUIRED_ARGUMENT = 1,
    OPTIONAL_ARGUMENT = 2]

#
  # Status codes.
  #
  STATUS_YET, STATUS_STARTED, STATUS_TERMINATED = 0, 1, 2

#
 # Error types.
 #
 class Error < StandardError; end
 class AmbiguousOption < Error; end
 class NeedlessArgument < Error; end
 class MissingArgument < Error; end
 class InvalidOption < Error; end

#
  # Set up option processing.
  #
  # The options to support are passed to new() as an array of arrays.
  # Each sub-array contains any number of String option names which carry
  # the same meaning, and one of the following flags:
  #
  # GetoptLong::NO_ARGUMENT :: Option does not take an argument.
  #
  # GetoptLong::REQUIRED_ARGUMENT :: Option always takes an argument.
  #
  # GetoptLong::OPTIONAL_ARGUMENT :: Option may or may not take an argument.
  #
  # The first option name is considered to be the preferred (canonical) name.
  # Other than that, the elements of each sub-array can be in any order.
  #
  def initialize(*arguments)
    #
    # Current ordering.
    #
    if ENV.include?('POSIXLY_CORRECT')
      @ordering = REQUIRE_ORDER
    else
      @ordering = PERMUTE
    end

#
    # Hash table of option names.
    # Keys of the table are option names, and their values are canonical
    # names of the options.
    #
    @canonical_names = Hash.new

#
    # Hash table of argument flags.
    # Keys of the table are option names, and their values are argument
    # flags of the options.
    #
    @argument_flags = Hash.new

#
    # Whether error messages are output to $stderr.
    #
    @quiet = FALSE

#
    # Status code.
    #
    @status = STATUS_YET

#
    # Error code.
    #
    @error = nil

#
    # Error message.
    #
    @error_message = nil

#
    # Rest of catenated short options.
    #
    @rest_singles = ''

#
    # List of non-option-arguments.
    # Append them to ARGV when option processing is terminated.
    #
    @non_option_arguments = Array.new

if 0 < arguments.length
 set_options(*arguments)
 end
 end

#
 # Set the handling of the ordering of options and arguments.
 # A RuntimeError is raised if option processing has already started.
 #
 # The supplied value must be a member of GetoptLong::ORDERINGS. It alters
 # the processing of options as follows:
 #
 # REQUIRE_ORDER :
 #
 # Options are required to occur before non-options.
 #
 # Processing of options ends as soon as a word is encountered that has not
 # been preceded by an appropriate option flag.
 #
 # For example, if -a and -b are options which do not take arguments,
 # parsing command line arguments of '-a one -b two' would result in
 # 'one', '-b', 'two' being left in ARGV, and only ('-a', '') being
 # processed as an option/arg pair.
 #
 # This is the default ordering, if the environment variable
 # POSIXLY_CORRECT is set. (This is for compatibility with GNU getopt_long.)
 #
 # PERMUTE :
 #
 # Options can occur anywhere in the command line parsed. This is the
 # default behavior.
 #
 # Every sequence of words which can be interpreted as an option (with or
 # without argument) is treated as an option; non-option words are skipped.
 #
 # For example, if -a does not require an argument and -b optionally takes
 # an argument, parsing '-a one -b two three' would result in ('-a','') and
 # ('-b', 'two') being processed as option/arg pairs, and 'one','three'
 # being left in ARGV.
 #
 # If the ordering is set to PERMUTE but the environment variable
 # POSIXLY_CORRECT is set, REQUIRE_ORDER is used instead. This is for
 # compatibility with GNU getopt_long.
 #
 # RETURN_IN_ORDER :
 #
 # All words on the command line are processed as options. Words not
 # preceded by a short or long option flag are passed as arguments
 # with an option of '' (empty string).
 #
 # For example, if -a requires an argument but -b does not, a command line
 # of '-a one -b two three' would result in option/arg pairs of ('-a', 'one')
 # ('-b', ''), ('', 'two'), ('', 'three') being processed.
 #
 def ordering=(ordering)
 #
 # The method is failed if option processing has already started.
 #
 if @status != STATUS_YET
 set_error(ArgumentError, "argument error")
 raise RuntimeError,
 "invoke ordering=, but option processing has already started"
 end

#
    # Check ordering.
    #
    if !ORDERINGS.include?(ordering)
      raise ArgumentError, "invalid ordering `#{ordering}'"
    end
    if ordering == PERMUTE && ENV.include?('POSIXLY_CORRECT')
      @ordering = REQUIRE_ORDER
    else
      @ordering = ordering
    end
  end

#
  # Return ordering.
  #
  attr_reader :ordering

#
  # Set options. Takes the same argument as GetoptLong.new.
  #
  # Raises a RuntimeError if option processing has already started.
  #
  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 !~ /^-([^-]|-.+)$/
            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

#
  # Set/Unset `quiet' mode.
  #
  attr_writer :quiet

#
  # Return the flag of `quiet' mode.
  #
  attr_reader :quiet

#
  # `quiet?' is an alias of `quiet'.
  #
  alias quiet? quiet

#
  # Explicitly terminate option processing.
  #
  def terminate
    return nil if @status == STATUS_TERMINATED
    raise RuntimeError, "an error has occurred" if @error != nil

@status = STATUS_TERMINATED
    @non_option_arguments.reverse_each do |argument|
      ARGV.unshift(argument)
    end

@canonical_names = nil
    @argument_flags = nil
    @rest_singles = nil
    @non_option_arguments = nil

return self
  end

#
  # Returns true if option processing has terminated, false otherwise.
  #
  def terminated?
    return @status == STATUS_TERMINATED
  end

#
  # Set an error (a protected method).
  #
  def set_error(type, message)
    $stderr.print("#{$0}: #{message}\n") if !@quiet

@error = type
    @error_message = message
    @canonical_names = nil
    @argument_flags = nil
    @rest_singles = nil
    @non_option_arguments = nil

raise type, message
  end
  protected :set_error

#
  # Examine whether an option processing is failed.
  #
  attr_reader :error

#
  # `error?' is an alias of `error'.
  #
  alias error? error

# Return the appropriate error message in POSIX-defined format.
  # If no error has occurred, returns nil.
  #
  def error_message
    return @error_message
  end

#
  # Get next option name and its argument, as an Array of two elements.
  #
  # The option name is always converted to the first (preferred)
  # name given in the original options to GetoptLong.new.
  #
  # Example: ['--option', 'value']
  #
  # Returns nil if the processing is complete (as determined by
  # STATUS_TERMINATED).
  #
  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] !~ /^-./
 @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] !~ /^-./)
 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 =~ /^(--[^=]+)/ && @rest_singles.length == 0
 #
 # This is a long style option, which start with `--'.
 #
 pattern = $1
 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 = $1
 elsif 0 < ARGV.length
 option_argument = ARGV.shift
 else
 set_error(MissingArgument,
 "option `#{argument}' requires an argument")
 end
 elsif @argument_flags[option_name] == OPTIONAL_ARGUMENT
 if argument =~ /=(.*)$/
 option_argument = $1
 elsif 0 < ARGV.length && ARGV[0] !~ /^-./
 option_argument = ARGV.shift
 else
 option_argument = ''
 end
 elsif argument =~ /=(.*)$/
 set_error(NeedlessArgument,
 "option `#{option_name}' doesn't allow an argument")
 end

elsif argument =~ /^(-(.))(.*)/
      #
      # 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, $2, $3

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] !~ /^-./
 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 falled into here.
 #
 return '', argument
 end

return @canonical_names[option_name], option_argument
  end

#
  # `get_option' is an alias of `get'.
  #
  alias get_option get

# Iterator version of `get'.
  #
  # The block is called repeatedly with two arguments:
  # The first is the option name.
  # The second is the argument which followed it (if any).
  # Example: ('--opt', 'value')
  #
  # The option name is always converted to the first (preferred)
  # name given in the original options to GetoptLong.new.
  #
  def each
    loop do
      option_name, option_argument = get_option
      break if option_name == nil
      yield option_name, option_argument
    end
  end

#
  # `each_option' is an alias of `each'.
  #
  alias each_option each
end

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