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bde60ad530
- evaluator.evaluate(expr, extra_names) returns (result_str, is_error) - blocks __builtins__ to prevent arbitrary code execution - handles ZeroDivisionError, ValueError, NameError with friendly messages - builtins.SAFE_NAMES covers trig, hyperbolic, log, exp, rounding, constants
23 lines
682 B
Python
23 lines
682 B
Python
from calc.engine.builtins import SAFE_NAMES
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def evaluate(expr: str, extra_names: dict = None) -> tuple[str, bool]:
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"""
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Evaluate a math expression safely.
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Returns (result_string, is_error).
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"""
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namespace = dict(SAFE_NAMES)
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if extra_names:
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namespace.update(extra_names)
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try:
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result = eval(expr, {"__builtins__": {}}, namespace)
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return str(result), False
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except ZeroDivisionError:
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return "Error: Division by zero", True
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except ValueError as err:
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return f"Error: {err}", True
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except NameError as err:
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return f"Error: {err}", True
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except Exception as err:
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return f"Error: {err}", True
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