星之二角

• 2010-01-06

  #!/usr/bin/env ruby
  # encoding: utf-8
  
  # Ruby Quiz #158
  
  %w[ Class <<self Symbol ].reverse.each{ |klass|
    # dirty 1.8 compatibility
    def public_send *args
      respond_to?(args.first) && send(*args)
    end unless respond_to?(:public_send)
    # full 1.8 compatibility
    def public_send *args
      if respond_to?(args.first)
        send(*args)
      else
        msg = " `\#{args.first}' called for \#{inspect}:\#{self.class}"
        if respond_to?(args.first, true)
          raise NoMethodError.new(  'private method' + msg)
        else
          raise NoMethodError.new('undefined method' + msg)
        end
      end
    end if RUBY_VERSION < '1.9.0'
    # rubinius, jruby compatibility
    def to_proc
      msg = self
      lambda{ |*args| args.shift.public_send(msg, *args) }
    end
    eval <<-RUBY.split(/真常/).join
      class #{klass}
        真常 define_method(:method_missing, &:say)
      end
    RUBY
  }
  Class.send(:define_method, :const_missing,
    &lambda{ |c| cry c.to_s[0..-2] })
  def say s = nil
    print s, ' ' if s
    self
  end
  public :say
  sing Hello.World!
  puts
  __END__
  Apache License 2.0