# File lib/spruz/lines_file.rb, line 27
    def initialize(lines, line_number = nil)
      @lines = lines
      @lines.each_with_index do |line, i|
        line.extend LineExtension
        line.instance_variable_set :@line_number, i + 1
        line.instance_variable_set :@lines_file, self
      end
      instance_variable_set :@line_number, line_number || (@lines.empty? ? 0 : 1)
    end