import expert

"""
Some rules to test with
"""

def test_is_final(facts):
	"""Return true when 'final_flag' is set"""
	return facts.get('final_flag')

class Rule_1(expert.Rule):
	"""rule1 description, fires after rule2"""
	def match(self, facts):
		return facts.get('rule2_fired')
	def fire(self, facts):
		facts.set('rule1_fired', True)

class Rule_2(expert.Rule):
	"""rule2 description, fired first"""
	def match(self, facts):
		return facts.get('initial')
	def fire(self, facts):
		facts.set('rule2_fired', True)

class Rule_3(expert.Rule):
	"""rule3 description, fires after rule1 and rule2"""
	def match(self, facts):
		return facts.get('rule1_fired')
	def fire(self, facts):
		facts.set('rule3_fired', True)
		facts.set('final_flag', True)

class Rule_4(expert.Rule):
	"""rule4, it should never fire"""
	def match(self, facts):
		return False
	def fire(self, facts):
		pass