parse_opts

# File lib/irb/init.rb, line 127
  def IRB.parse_opts
    load_path = []
    while opt = ARGV.shift
      case opt
      when "-f"
        @CONF[:RC] = false
      when "-m"
        @CONF[:MATH_MODE] = true
      when "-d"
        $DEBUG = true
      when /^-r(.+)?/
        opt = $1 || ARGV.shift
        @CONF[:LOAD_MODULES].push opt if opt
      when /^-I(.+)?/
        opt = $1 || ARGV.shift
        load_path.concat(opt.split(File::PATH_SEPARATOR)) if opt
      when /^-K(.)/
        $KCODE = $1
      when "--inspect"
        @CONF[:INSPECT_MODE] = true
      when "--noinspect"
        @CONF[:INSPECT_MODE] = false
      when "--readline"
        @CONF[:USE_READLINE] = true
      when "--noreadline"
        @CONF[:USE_READLINE] = false
      when "--echo"
        @CONF[:ECHO] = true
      when "--noecho"
        @CONF[:ECHO] = false
      when "--verbose"
        @CONF[:VERBOSE] = true
      when "--noverbose"
        @CONF[:VERBOSE] = false
      when "--prompt-mode", "--prompt"
        prompt_mode = ARGV.shift.upcase.tr("-", "_").intern
        @CONF[:PROMPT_MODE] = prompt_mode
      when "--noprompt"
        @CONF[:PROMPT_MODE] = :NULL
      when "--inf-ruby-mode"
        @CONF[:PROMPT_MODE] = :INF_RUBY
      when "--sample-book-mode", "--simple-prompt"
        @CONF[:PROMPT_MODE] = :SIMPLE
      when "--tracer"
        @CONF[:USE_TRACER] = true
      when "--back-trace-limit"
        @CONF[:BACK_TRACE_LIMIT] = ARGV.shift.to_i
      when "--context-mode"
        @CONF[:CONTEXT_MODE] = ARGV.shift.to_i
      when "--single-irb"
        @CONF[:SINGLE_IRB] = true
      when "--irb_debug"
        @CONF[:DEBUG_LEVEL] = ARGV.shift.to_i
      when "-v", "--version"
        print IRB.version, "\n"
        exit 0
      when "-h", "--help"
        require "irb/help"
        IRB.print_usage
        exit 0
      when /^-/
        IRB.fail UnrecognizedSwitch, opt
      else
        @CONF[:SCRIPT] = opt
        $0 = opt
        break
      end
    end
    if RUBY_VERSION >= FEATURE_IOPT_CHANGE_VERSION
      load_path.collect! do |path|
        /\A\.\// =~ path ? path : File.expand_path(path)
      end
    end
    $LOAD_PATH.unshift(*load_path)
  end