FizzBuzz（世界のナベアツ）プログラム on Ruby

【プログラム】

require "nabeatsu"
nabeatsu = Nabeatsu.new

nabeatsu.status "アホ", :rule => [3.no_baisu_no_toki, 3.no_tsuku_toki]
nabeatsu.status "犬", :rule => 5.no_baisu_no_toki

nabeatsu.say 1..40 do |number, status|
  if status
    print "#{number}(#{status.join(' ')})"
  else
    print number
  end
  print " "
end
puts

【出力結果】

1 2 3(アホ) 4 5(犬) 6(アホ) 7 8 9(アホ) 10(犬) 11 12(アホ) 13(アホ) 14 15(アホ犬) 16 17 18(アホ) 19 20(犬) 21(アホ) 22 23(アホ) 24(アホ) 25(犬) 26 27(アホ) 28 29 30(アホ犬) 31(アホ) 32(アホ) 33(アホ) 34(アホ) 35(アホ犬) 36(アホ) 37(アホ) 38(アホ) 39(アホ) 40(犬)

こんな感じで、簡単にナベアツの状態の定義・出力が出来ます。

書庫作るのも面倒なので、nabeatsu.rbのソースをそのままここに貼っておきます。RSpecとかっぽく書けるようにするため、Numericの再定義とかが含まれています。

# 世界のナベアツプログラム on Ruby
# (C)2008 Maraigue (http://f52.aaa.livedoor.jp/~maraigue/)
# 複製・改変はBSDライセンスに合わせます。末尾の著作権表示をご覧下さい。

class Numeric
  # numの倍数が与えられたときに真、それ以外のときに偽となる無名関数を返す
  def no_baisu_no_toki
    lambda{ |val| (val / self).floor * self == val }
  end
  
  # numを含むとき真、それ以外のときに偽となる無名関数を返す
  def no_tsuku_toki
    lambda{ |val| val.to_s.index(self.to_s) }
  end
end

class Nabeatsu
  def initialize
    @statuses = []
    @rules = []
  end
  
  # 特殊な状態になる条件を追加する
  def status(str, option)
    @statuses.add str
    
    if option[:rule].instance_of?(Array)
      @rules.add option[:rule]
    else
      @rules.add [option[:rule]]
    end
  end
  
  # 指定した範囲の数を言わせる
  # ブロックには、第1引数に数が、第2引数にナベアツの状態を表す配列が
  # 格納される。
  def say(range)
    range.each do |this_number|
      this_status = []
      @statuses.each_index do |i|
        if @rules[i].any?{ |block| block.call(this_number) }
          this_status.add @statuses[i]
        end
      end
      yield this_number, (this_status.empty? ? nil : this_status)
    end
  end
end

if $0 == __FILE__
  nabeatsu = Nabeatsu.new
  
  nabeatsu.status "Aho", :rule => [3.no_baisu_no_toki, 3.no_tsuku_toki]
  nabeatsu.status "Inu", :rule => 5.no_baisu_no_toki
  
  nabeatsu.say 1..40 do |number, status|
    if status
      print "#{number}(#{status.join(' ')})"
    else
      print number
    end
    print " "
  end
  puts
end

# Copyright (c) 2008, Maraigue
#
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#
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# modification, are permitted provided that the following conditions
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# software without specific prior written permission.
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