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PongSource/src/StateMachine.lua

+StateMachine = Class{}
+
+function StateMachine:init(states)
+	self.empty = {
+		render = function() end,
+		update = function() end,
+		enter = function() end,
+		exit = function() end
+	}
+	self.states = states or {} -- [name] -> [function that returns states]
+	self.current = self.empty
+end
+
+function StateMachine:change(stateName, enterParams)
+	assert(self.states[stateName]) -- state must exist!
+	self.current:exit()
+	self.current = self.states[stateName]()
+	self.current:enter(enterParams)
+end
+
+function StateMachine:update(dt)
+	self.current:update(dt)
+end
+
+function StateMachine:render()
+	self.current:render()
+end