class Rcov::FileStatistics

def is_code?(lineno)
  unless @is_begin_comment
    @is_begin_comment = Array.new(@lines.size, false)
    pending = []
    state = :code
    @lines.each_with_index do |line, index|
      line.force_encoding("utf-8") if line.respond_to?(:force_encoding)
      case state
      when :code
        if /^=begin\b/ =~ line
          state = :comment
          pending << index
        end
      when :comment
        pending << index
        if /^=end\b/ =~ line
          state = :code
          pending.each{|idx| @is_begin_comment[idx] = true}
          pending.clear
        end
      end
    end
  end
  @lines[lineno] && !@is_begin_comment[lineno] && @lines[lineno] !~ /^\s*(#|$)/ 
end