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Edit File: getoptlong.rb

#
# 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:
#
# # == Synopsis
# #
# # hello: greets user, demonstrates command line parsing
# #
# # == Usage
# #
# # 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.
# 
# require 'getoptlong'
# require 'rdoc/usage'
# 
# 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'
# RDoc::usage
# 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 AmbigousOption < 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 $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

#
 # 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|
      #
      # 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

#
  # 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 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

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

#
  # Set an error (protected).
  #
  def set_error(type, message)
    $deferr.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.
	#
	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' 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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