33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
class Evalizer():
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"""几乎无副作用的模板系统
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接受环境信息并创建一个模板解析工具, 工具传入参数支持list, dict及其嵌套
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副作用问题: 仅存在于 eval 函数
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"""
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# TODO: 弃用风险极高的 eval
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# 理论上已经限制了全局函数 但eval仍有风险
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# TODO: 异步/多线程执行避免堵塞
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def __init__(self, environment: dict) -> None:
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self.env = environment
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def __call__(self, anyobj):
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return self.travel(anyobj)
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def travel(self, anyobj):
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if isinstance(anyobj, list):
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return list(map(self.travel, anyobj))
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elif isinstance(anyobj, dict):
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return dict(map(self.travel, anyobj.items()))
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elif isinstance(anyobj, str):
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if anyobj.startswith("eval:"):
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return self.eval_with_env(anyobj[5:])
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else:
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return anyobj
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else:
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return anyobj
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def eval_with_env(self, s: str):
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ret = eval(s, {}, self.env)
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if not isinstance(ret, str):
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ret = str(ret)
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return ret |