# File lib/maruku/input/linesource.rb, line 56
        def describe
                s = "At line #{original_line_number(@lines_index)}\n"
                
                context = 3 # lines
                from = [@lines_index-context, 0].max
                to   = [@lines_index+context, @lines.size-1].min
                
                for i in from..to
                        prefix = (i == @lines_index) ? '--> ' : '    ';
                        l = @lines[i]
                        s += "%10s %4s|%s" %
                                [@lines[i].md_type.to_s, prefix, l]
                                
                        s += "|\n"
                end
                
#               if @parent 
#                       s << "Parent context is: \n"
#                       s << add_tabs(@parent.describe,1,'|')
#               end
                s
        end