# File lib/wee/decoration.rb, line 96
    def add_decoration(d)
      if d.global?
        d.next = @decoration
        @decoration = d
      else
        last_global = nil
        each_decoration {|i| 
          if i.global?
            last_global = i
          else
            break
          end
        }
        if last_global.nil?
          # no global decorations specified -> add in front
          d.next = @decoration
          @decoration = d
        else
          # add after last_global
          d.next = last_global.next
          last_global.next = d
        end
      end

      return self
    end

# File lib/wee/decoration.rb, line 79
    def each_decoration # :yields: decoration
      d = @decoration
      while d and d != self
        yield d
        d = d.next
      end
    end

# File lib/wee/decoration.rb, line 129
    def remove_decoration(d)
      if d == @decoration  # 'd' is in front
        @decoration = d.next
      else
        last_decoration = @decoration
        next_decoration = nil
        loop do
          return nil if last_decoration == self or last_decoration.nil?
          next_decoration = last_decoration.next
          break if d == next_decoration
          last_decoration = next_decoration
        end
        last_decoration.next = d.next
      end
      d.next = nil  # decoration 'd' no longer is an owner of anything!
      return d
    end

# File lib/wee/decoration.rb, line 154
    def remove_decoration_if # :yields: decoration
      to_remove = []
      each_decoration {|d| to_remove << d if yield d}
      to_remove.each {|d| remove_decoration(d)}
    end