causal_grammar.py 文件源码

def get_actions_used(parse, first = True):
    actions = set()
    if "symbol_type" in parse and parse["symbol_type"] in ("event",):
        actions.add(parse['symbol'])
        #print("EVENT USED: {}".format(causal_tree['symbol']))
    if "children" in parse:
        for child in parse['children']:
            actions.update(get_actions_used(child, False))
    return actions