expand_tabs

# File lib/rdoc/text.rb, line 43
  def expand_tabs text
    expanded = []

    text.each_line do |line|
      line.gsub!(/^(.{8}*?)([^\t\r\n]{0,7})\t/) do
        r = "#{$1}#{$2}#{' ' * (8 - $2.size)}"
        r.force_encoding text.encoding if Object.const_defined? :Encoding
        r
      end until line !~ /\t/

      expanded << line
    end

    expanded.join
  end