bob_bot_5

message_types.rb

# Base
class Base
  attr_reader :message

  def initialize(message)
    @message = message
  end

  def valid?
    !message.nil?
  end

  def accept(visitor)
    raise "Not yet implemented"
  end
end

# Question
class Question < Base
  def valid?
    super && message.end_with?("?")
  end

  def accept(visitor)
    visitor.respond_to_question
  end
end

# Yell
class Yell < Base
  def valid?
    super &&
      !message.strip.empty? &&
      message == message.upcase &&
      message != message.to_i.to_s
  end

  def accept(visitor)
    visitor.respond_to_yell
  end
end

# Silence
class Silence < Base
  def valid?
    super && message.strip.empty?
  end

  def accept(visitor)
    visitor.respond_to_silence
  end
end

# Anything
class Anything < Base
  def valid?
    super && true
  end

  def accept(visitor)
    visitor.respond_to_anything
  end
end