gistfile1.rb

# -*- coding: utf-8 -*-
#
# @file 
# @brief  p_classtree 改良版
# @author ongaeshi
# @date   2010/09/30

# アルファベットと演算子で表示する数を変える
ALPHABET_DISP_NUM = 5
OPERATOR_DISP_NUM = 10

def p_classtree(c)
  unless c.is_a?(Class)
    c = c.class
  end
  
  while (true)
    puts c.name
    break if (c == Object)
    p_classtree_sub(c)
    c = c.superclass
  end
end

def p_classtree_sub(c)
  # メソッドの一覧を得る
  group = c.public_instance_methods(false).sort.partition { |m| m =~ /\w/ }
  array = group.flatten
  operator_start_index = group[0].size
  limit = ALPHABET_DISP_NUM

  print (array.size > limit) ? "｜  " :  "↓  "
  
  counter = 0
  array.each_with_index do |v, index|
    if (index == operator_start_index)
      limit = OPERATOR_DISP_NUM
      counter = 0
      puts
      print (array.size - index > limit) ? "｜  " : "↓  "
    end

    if (counter >= limit)
      counter = 0
      puts
      print (array.size - index > limit) ? "｜  " : "↓  "
    end

    print v + ", "
    counter += 1
  end
  puts
end

if __FILE__ == $0
  # インスタンスを渡した場合はその所属するクラスの階層、メソッドを表示
  a = [0, 1, 2]
  p_classtree(a)
  puts

  # クラス名を直接渡してもOK
  p_classtree(Fixnum)
  puts
  p_classtree(Bignum)
end