36 lines
1.1 KiB
Python
36 lines
1.1 KiB
Python
class Evalizer():
|
|
"""几乎无副作用的模板系统
|
|
|
|
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
|
|
副作用问题: 仅存在于 eval 函数
|
|
"""
|
|
|
|
# TODO: 弃用风险极高的 eval
|
|
# TODO: 异步/多线程执行避免堵塞
|
|
def __init__(self, environment: dict) -> None:
|
|
self.env = environment
|
|
|
|
def __call__(self, anyobj):
|
|
return self.travel(anyobj)
|
|
|
|
def travel(self, anyobj):
|
|
if isinstance(anyobj, list):
|
|
return list(map(self.travel, anyobj))
|
|
elif isinstance(anyobj, dict):
|
|
return dict(map(self.travel, anyobj.items()))
|
|
elif isinstance(anyobj, tuple):
|
|
return tuple(map(self.travel, anyobj))
|
|
elif isinstance(anyobj, str):
|
|
if anyobj.startswith("eval:"):
|
|
return self.eval_with_env(anyobj[5:])
|
|
else:
|
|
return anyobj
|
|
else:
|
|
return anyobj
|
|
|
|
def eval_with_env(self, s: str):
|
|
ret = eval(s, globals(), self.env)
|
|
if not isinstance(ret, str):
|
|
ret = str(ret)
|
|
return ret
|