Clean Code.

mystery.rb

    def nb_lines(width, text)
      text = "" if text.nil?
      cw = @CurrentFont['cw']
      width = @w - @rMargin - @x  if (width == 0)
      wmax = (width - 2 * @cMargin) * 1000 / @FontSize
      s = text.gsub("\r", '')
      nb = s.length
      nb -= 1 if nb > 0 && s[nb-1] == "\n"
      sep = -1
      i, j, l = 0, 0, 0
      nl = 1
      while i < nb
        c = s[i].chr
        if (c == "\n")
          i += 1
          sep = -1
          j = 1
          l = 0
          nl += 1
          next
        end
        sep = i if (c == ' ')
        l += cw[c[0].ord]
        if (l > wmax)
          if (sep == -1)
            i += 1 if i == j
          else
            i = sep +1
          end
          sep = -1
          j = i
          l = 0
          nl += 1
        else
          i += 1
        end
      end
      nl
    end