Iterate Search

#!/usr/bin/ruby
Search = Struct.new :contents, :search, :stop, :direction do
  def iterate_search
    setup
    iterate_search_sub search, 0
  end
  private
  def setup
    @contents_list = contents.lines.to_a
    if direction == :right
      @re = /\S{10}$/
    else
      @contents_list.reverse!
      @re = /\A\S{10}/
    end
  end
  def iterate_search_sub(word, start_line)
    @contents_list.each_with_index do |line, i|
      next if i < start_line
      if line.include? word
        disp word, line
        return if line.include? stop
        iterate_search_sub line[@re], i + 1
        return
      end
    end
    puts "<stop: #{stop}> not found"
  end
  def disp(word, line)
    puts "#{word}\t#{line}"
    puts
  end
end
if $0 == __FILE__
  data = ARGF.read
  Search.new.tap do |s|
    s.contents = data
    s.search = 'ABCDEFGHIJ'
    s.stop = 'D1D2D3D4D5'
    s.direction = :right
    s.iterate_search
  end
  puts '-' * 4
  Search.new.tap do |s|
    s.contents = data
    s.search = 'C9D1D2D3D4'
    s.stop = 'BCDEFGHIJK'
    s.direction = :left
    s.iterate_search
  end
end