def parse_requirements(requirements, courses_taken):
if type(requirements) == Course:
if requirements.code in courses_taken:
return None
else:
return requirements
c1 = parse_requirements(requirements.children[0], courses_taken)
c2 = parse_requirements(requirements.children[1], courses_taken)
if requirements.logic == "and":
if c1 == None and c2 == None:
return None
elif c1 == None:
return c2
elif c2 == None:
return c1
ret = Dependency(give_id=False)
ret.add_children("&", c1, c2, find_children_id=False)
return ret
elif requirements.logic == "or":
if c1 == None or c2 == None:
return None
ret = Dependency(give_id=False)
ret.add_children("|", c1, c2, find_children_id=False)
return ret
