書籍「7つの言語7つの世界」Rubyの章の最後の問題

method_missingテクニックを使って、CSVの一行目にある物をメソッド名にしてあとの二行をその列にある物を表示させる、attr_accessorもこんなふうに実現してるのかなあ

githubにリポジトリつくったよ
http://github.com/yppp/sevenlang

# -*- coding:utf-8 -*-

class CsvRow
  def initialize(header, row)
    @header = header.map{|x| x.strip}
    @row = row.map{|x| x. strip}
  end

  def method_missing name, *args
    namest =  name.to_s
    ret = nil
    @header.zip(@row) do |x, y|
      if namest == x then
        ret = y
        break
      end
    end
    super if ret.nil?
    ret
  end
end

module ActsAsCsv
  def self.included(base)
    base.extend ClassMethods
  end
  
  module ClassMethods
    def acts_as_csv
      include InstanceMethods
    end

    module InstanceMethods
      def read
        @csv_contents = []
        filename = self.class.to_s.downcase + '.txt'
        File::open(filename) do |f|
          @headers = f.gets.chomp.split(",")
          f.each do |row|
            @csv_contents << CsvRow::new(@headers, row.chomp.split(","))
          end
        end
      end

      def each(&block)
        @csv_contents.each &block
      end

      attr_accessor :headers, :csv_contents

      def initialize
        read
      end
    end
  end
end


class RubyCsv
  include ActsAsCsv
  acts_as_csv
end

m = RubyCsv::new
m.each{|row| puts row.one}
m.each{|row| puts row.two}
m.each{|row| puts row.teeeee}

読み込ませたcsv

one,two, teeeee
lions, tigers,cat
camel, alpaca,lama