fight.rb

#
# Fight.rb - showing overiding of instance methods and rebinding of a context.
#  
#
#
#


require 'alias_dci' 

class Battle
  include AliasDCI::Context
  
  role :lion do
    def fight
      p "#{name}: RAWR, I am a lion and I run fast."
    end
  end 
  
  role :bear do
    def fight
      p "#{name}: ARRR, I am a mighty  bear and I will eat you."
    end
  end
  
  def initialize(lion_player, bear_player)
    rebind(lion_player, bear_player)
  end
  
  def rebind(lion_player, bear_player)
    assign_named_roles(:lion => lion_player, :bear => bear_player)
  end
  
  def do_battle
    in_context do
      lion.fight
      bear.fight
      puts "\n\nLets have a party!"
      TeaAndCakes.new(lion, bear).tea_party!
    end
  end
end

class TeaAndCakes
  include AliasDCI::Context
  
  role :tea_drinker do
    contract :fight, :name
    def fight_or_drink_tea
      fight
      puts "#{name}: I would rather drink tea"
    end
    
  end 

  role :cake_eater do
    contract :fight, :name
    def fight_or_eat_cake
      fight
      puts "#{name}: I would rather eat cake"
    end
  end

  def initialize(tea_drinker, cake_eater)
    rebind(tea_drinker, cake_eater)
  end
  
  def rebind(tea_drinker, cake_eater)
    assign_named_roles(:tea_drinker => tea_drinker, :cake_eater => cake_eater)
  end
  
  def tea_party!
    in_context do
      tea_drinker.fight_or_drink_tea
      cake_eater.fight_or_eat_cake
    end
  end
end

class Player < Struct.new(:name)
  include AliasDCI::DataObject
  
  def fight
    puts "#{name}: I don't want to fight I'm a pacifist"
  end
end


player_a = Player.new("Arthur Dent")
player_b = Player.new("Zaphod")


player_a.fight
player_b.fight

battle = Battle.new(player_a, player_b)

#round1
p "ROUND 1 : FIGHT"
battle.do_battle 

# => nil

# >> Arthur Dent: I don't want to fight I'm a pacifist
# >> Zaphod: I don't want to fight I'm a pacifist
# >> "ROUND 1 : FIGHT"
# >> "Arthur Dent: RAWR, I am a lion and I run fast."
# >> "Zaphod: ARRR, I am a mighty  bear and I will eat you."
# >> 
# >> 
# >> Lets have a party!
# >> Arthur Dent: I don't want to fight I'm a pacifist
# >> Arthur Dent: I would rather drink tea
# >> Zaphod: I don't want to fight I'm a pacifist
# >> Zaphod: I would rather eat cake