Class GetoptLong
In: getoptlong.rb
Parent: Object

Parse command line options just like GNU getopt_long().

Methods

Classes and Modules

Class GetoptLong::AmbigousOption
Class GetoptLong::Error
Class GetoptLong::InvalidOption
Class GetoptLong::MissingArgument
Class GetoptLong::NeedlessArgument

Constants

ORDERINGS = [REQUIRE_ORDER = 0, PERMUTE = 1, RETURN_IN_ORDER = 2]   Orderings.
ARGUMENT_FLAGS = [NO_ARGUMENT = 0, REQUIRED_ARGUMENT = 1, OPTIONAL_ARGUMENT = 2]   Argument flags.
STATUS_TERMINATED = 0, 1, 2

External Aliases

quiet -> quiet?
  `quiet?’ is an alias of `quiet’.
error -> error?
  `error?’ is an alias of `error’.

Attributes

error  [R]  Examine whether an option processing is failed.
ordering  [R]  Return ordering.
quiet  [W]  Set/Unset `quit’ mode.
quiet  [R]  Return the flag of `quiet’ mode.

Public Class methods

Initializer.

[Source]

# File getoptlong.rb, line 45
  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 $deferr.
    #
    @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

Public Instance methods

Iterator version of `get’.

[Source]

# File getoptlong.rb, line 456
  def each
    loop do
      option_name, option_argument = get_option
      break if option_name == nil
      yield option_name, option_argument
    end
  end
each_option()

Alias for each

Return an error message.

[Source]

# File getoptlong.rb, line 282
  def error_message
    return @error_message
  end

Get next option name and its argument as an array.

[Source]

# File getoptlong.rb, line 289
  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.
        #
        match_count = 0
        @canonical_names.each_key do |key|
          if key.index(pattern) == 0
            option_name = key
            match_count += 1
          end
        end
        if 2 <= match_count
          set_error(AmbigousOption, "option `#{argument}' is ambiguous")
        elsif match_count == 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, "illegal 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()

Alias for get

Set ordering.

[Source]

# File getoptlong.rb, line 108
  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

Set options

[Source]

# File getoptlong.rb, line 139
  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|
      #
      # Each argument must be an Array.
      #
      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

Terminate option processing.

[Source]

# File getoptlong.rb, line 228
  def terminate
    return nil if @status == STATUS_TERMINATED
    raise RuntimeError, "an error has occured" 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

Examine whether option processing is terminated or not.

[Source]

# File getoptlong.rb, line 248
  def terminated?
    return @status == STATUS_TERMINATED
  end

[Validate]