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36 lines
1020 B
Python
36 lines
1020 B
Python
from __future__ import annotations
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from dataclasses import dataclass
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from typing import Callable, Any
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@dataclass
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class RecursionLimits:
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max_depth: int = 5
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max_nodes: int = 10_000
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class RecursionEngine:
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"""Safe, bounded recursion helper."""
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def __init__(self, limits: RecursionLimits | None = None) -> None:
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self.limits = limits or RecursionLimits()
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self._nodes = 0
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def recursive(self, fn: Callable[[Any], Any], x: Any, depth: int = 0) -> Any:
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if depth > self.limits.max_depth:
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raise RecursionError("max_depth exceeded")
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if self._nodes >= self.limits.max_nodes:
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raise RecursionError("max_nodes exceeded")
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self._nodes += 1
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y = fn(x)
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# placeholder: stop when fn returns x unchanged
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if y == x:
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return y
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return self.recursive(fn, y, depth + 1)
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if __name__ == "__main__":
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eng = RecursionEngine(RecursionLimits(max_depth=3))
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print(eng.recursive(lambda n: n - 1 if n > 0 else n, 3))
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