43基本的面向对象分析和设计

class Scene
	def enter()
		puts "This scene is not yet configured. Subclass it and implement enter()."
		exit(1)
	end
end


class Engine
	
	def initialize(scene_map)
		@scene_map = scene_map
	end
	
	def play()
		current_scene = @scene_map.opening_scene()
		last_scene = @scene_map.next_scene('finished')
		
		while current_scene != last_scene
			next_scene_name = current_scene.enter()
			current_scene = @scene_map.next_scene(next_scene_name)
		end
		
		# be sure to print out the last scene
		current_scene.enter()
	end
end

class Death < Scene
	
	@@quips = [
		"You died. You kinda suck at this.",
		"Your mom would be proud...if she were smarter.",
		"Suck a luser.",
		"I have a small puppy that's better at this.",
	]
	
	def enter()
		puts @@quips[rand(0..(@@quips.length - 1))]
		exit(1)
	end
end

class CentralCorridor < Scene

	def enter()
		puts "'Hello!' A red dog says,"
		puts "\n"
		puts "'What are you doing here?'\n"
		print "> "
		action = $stdin.gets.chomp
		
		if action == "shoot!"
			puts "The dog avoid the bullet."
			puts "And shoot you with his eye."
			puts "You dead."
			return 'death'
			
		elsif action == "tell a joke"
			puts "You say:'Catch the ball!'"
			puts "The dog run away."
			return 'laser_weapon_armory' 
			
		else 
			puts "The dog says:'Get out!'"
			return 'central_corridor'
		end
	end
end

class LaserWeaponArmory < Scene

	def enter()
		puts "enter 1 numbers:"
		code = "#{rand(1..9)}"
		print "[keypad]> "
		guess = $stdin.gets.chomp
		guesses = 1
		
		while guess != code && guesses < 5
			puts "Wrong!"
			guesses += 1
			print "[keypad]> "
			guess = $stdin.gets.chomp
		end
		
		if guess == code
			puts "The door open."
			puts "You see a bridge."
			return 'the_bridge'
		else
			puts "Huge fire out from the door!\n"
			puts "You die."
			return 'death'
		end
	end
end

class TheBridge < Scene

	def enter()
		puts "A large potato lies on the road.\n"
		puts "How you go through?\n"
		print "> "
		
		action = $stdin.gets.chomp
		
		if action == "throw the bomb"
			puts "The potato explode and the piece hit you."
			return 'death'
			
		elsif action == "slowly place the bomb"
			puts "You placed the bomb and run away."
			puts "You successfully sweep out the potato."
			return 'escape_pod'
		else
			puts "Nothing happened."
			return "the_bridge"
		end
	end
end

class EscapePod < Scene

	def enter()
		puts "There are 5 pods."
		good_pod = rand(1..5)
		print "[pod #]> "
		guess = $stdin.gets.chomp.to_i
		
		if guess != good_pod
			puts "Nothing happened.\n"
			puts "10 days passed, you dead."
			return 'death'
		else
			puts "win!"
			
			return 'finished'
		end
	end
end

class Finished < Scene
	def enter()
		puts "Good job!"
	end
end

class Map
	@@scenes = {
		'central_corridor' => CentralCorridor.new(),
		'laser_weapon_armory' => LaserWeaponArmory.new(),
		'the_bridge' => TheBridge.new(),
		'escape_pod' => EscapePod.new(),
		'death' => Death.new(),
	}
	
	def initialize(start_scene)
		@start_scene = start_scene
	end
	
	def next_scene(scene_name)
		val = @@scenes[scene_name]
		return val
	end
	
	def opening_scene()
		return next_scene(@start_scene)
	end
end


a_map = Map.new('central_corridor')
a_game = Engine.new(a_map)
a_game.play()
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43基本的面向对象分析和设计

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