112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
"""
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tools/calculator.py
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数学计算工具 —— 支持基本四则运算及常用数学函数
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配置通过 settings.tools['calculator'] 读取
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"""
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import math
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import operator
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from typing import Any
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from config.settings import settings
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from utils.logger import get_logger
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logger = get_logger("TOOL.Calculator")
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def _cfg(key: str, fallback=None):
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return settings.tools['calculator'].get(key, fallback)
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class CalculatorTool:
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name = "calculator"
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description = (
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"执行数学计算，支持四则运算、幂运算、开方、三角函数、对数等。"
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"输入数学表达式字符串，返回计算结果。"
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)
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parameters = {
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"type": "object",
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"properties": {
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"expression": {
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"type": "string",
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"description": (
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"数学表达式，例如: '2 + 3 * 4', 'sqrt(16)', "
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"'sin(3.14159/2)', 'log(100, 10)', '2 ** 10'"
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),
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},
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},
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"required": ["expression"],
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}
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# 安全的内置函数白名单
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_SAFE_GLOBALS: dict[str, Any] = {
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"__builtins__": {},
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# 基本数学
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"abs": abs,
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"round": round,
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"pow": pow,
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"min": min,
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"max": max,
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# math 模块常用函数
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"sqrt": math.sqrt,
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"ceil": math.ceil,
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"floor": math.floor,
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"log": math.log,
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"log2": math.log2,
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"log10": math.log10,
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"exp": math.exp,
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"sin": math.sin,
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"cos": math.cos,
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"tan": math.tan,
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"asin": math.asin,
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"acos": math.acos,
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"atan": math.atan,
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"atan2": math.atan2,
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"pi": math.pi,
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"e": math.e,
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"inf": math.inf,
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"factorial": math.factorial,
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"gcd": math.gcd,
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"hypot": math.hypot,
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}
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def execute(self, expression: str = "", **_) -> str:
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if not expression or not expression.strip():
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return "❌ 参数错误: expression 不能为空"
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expr = expression.strip()
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logger.info(f"🔢 计算表达式: {expr}")
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# 安全检查：禁止危险关键字
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forbidden = ["import", "exec", "eval", "open", "os", "sys",
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"__", "compile", "globals", "locals", "getattr"]
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for kw in forbidden:
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if kw in expr:
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return f"❌ 安全限制: 表达式包含禁止关键字 '{kw}'"
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try:
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precision = _cfg('precision', 10)
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result = eval(expr, self._SAFE_GLOBALS, {}) # noqa: S307
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# 格式化输出
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if isinstance(result, float):
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# 去除多余尾零
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formatted = f"{result:.{precision}f}".rstrip("0").rstrip(".")
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elif isinstance(result, complex):
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formatted = str(result)
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else:
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formatted = str(result)
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logger.info(f"✅ 计算结果: {expr} = {formatted}")
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return f"{expr} = {formatted}"
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except ZeroDivisionError:
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return f"❌ 计算错误: 除零错误 表达式: {expr}"
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except OverflowError:
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return f"❌ 计算错误: 数值溢出 表达式: {expr}"
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except ValueError as e:
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return f"❌ 计算错误: {e} 表达式: {expr}"
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except SyntaxError:
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return f"❌ 语法错误: 无法解析表达式 '{expr}'"
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except Exception as e:
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return f"❌ 计算失败: {e} 表达式: {expr}" |