class RDoc::Markup::AttrSpan

def [](n)
  @attrs[n]
end

def initialize(length, exclusive)
  @attrs = Array.new(length, 0)
  @exclusive = exclusive
end

def set_attrs(start, length, bits)
  updated = false
  for i in start ... (start+length)
    if (@exclusive & @attrs[i]) == 0 || (@exclusive & bits) != 0
      @attrs[i] |= bits
      updated = true
    end
  end
  updated
end