# File optparse.rb, line 288
    def self.guess(arg)
      case arg
      when ""
        t = self
      when /\A=?\[/
        t = Switch::OptionalArgument
      when /\A\s+\[/
        t = Switch::PlacedArgument
      else
        t = Switch::RequiredArgument
      end
      self >= t or incompatible_argument_styles(arg, t)
      t
    end

# File optparse.rb, line 303
    def self.incompatible_argument_styles(arg, t)
      raise ArgumentError, "#{arg}: incompatible argument styles\n  #{self}, #{t}"
    end

# File optparse.rb, line 311
    def initialize(pattern = nil, conv = nil,
                   short = nil, long = nil, arg = nil,
                   desc = ([] if short or long), block = Proc.new)
      raise if Array === pattern
      @pattern, @conv, @short, @long, @arg, @desc, @block =
        pattern, conv, short, long, arg, desc, block
    end

# File optparse.rb, line 307
    def self.pattern
      NilClass
    end

# File optparse.rb, line 370
    def summarize(sdone = [], ldone = [], width = 1, max = width - 1, indent = "")
      sopts, lopts, s = [], [], nil
      @short.each {|s| sdone.fetch(s) {sopts << s}; sdone[s] = true} if @short
      @long.each {|s| ldone.fetch(s) {lopts << s}; ldone[s] = true} if @long
      return if sopts.empty? and lopts.empty? # completely hidden

      left = [sopts.join(', ')]
      right = desc.dup

      while s = lopts.shift
        l = left[-1].length + s.length
        l += arg.length if left.size == 1 && arg
        l < max or left << ''
        left[-1] << if left[-1].empty? then ' ' * 4 else ', ' end << s
      end

      left[0] << arg if arg
      mlen = left.collect {|s| s.length}.max.to_i
      while mlen > width and l = left.shift
        mlen = left.collect {|s| s.length}.max.to_i if l.length == mlen
        yield(indent + l)
      end

      while begin l = left.shift; r = right.shift; l or r end
        l = l.to_s.ljust(width) + ' ' + r if r and !r.empty?
        yield(indent + l)
      end