# File lib/saikuro.rb, line 885
  def summarize_errors_and_warnings(enw, header)
    return "" if enw.empty?
    f = StringIO.new
    erval = Hash.new { |h,k| h[k] = Array.new }
    wval = Hash.new { |h,k| h[k] = Array.new }

    enw.each do |fname, warnings, errors|
      errors.each do |c,m,v|
        erval[v] << [fname, c, m]
      end
      warnings.each do |c,m,v|
        wval[v] << [fname, c, m]
      end
    end

    f.puts "<h2 class=\"class_name\">Errors and Warnings</h2>"
    f.puts "<table width=\"100%\" border=\"1\">"
    f.puts header

    f.puts print_summary_table_rows(erval, "error")
    f.puts print_summary_table_rows(wval, "warning")
    f.puts "</table>"

    f.string
  end