class Regexp::Scanner

def emit_options(text, ts, te)
  if text =~ /\(\?([mixdau]*)-?([mix]*)(:)?/
    positive, negative, group_local = $1, $2, $3
    if positive.include?('x')
      self.free_spacing = true
    end
    # If the x appears in both, treat it like ruby does, the second cancels
    # the first.
    if negative.include?('x')
      self.free_spacing = false
    end
    if group_local
      spacing_stack << {:free_spacing => free_spacing, :depth => group_depth}
    else
      # switch for parent group level
      spacing_stack.last[:free_spacing] = free_spacing
    end
  end
  emit(:group, :options, text, ts, te)
end