"""Small, testable classification primitives for differential comparator lanes."""

from __future__ import annotations

import re
from typing import Pattern


def diagnostic_detected(output: str, pattern: Pattern[str]) -> bool:
    return pattern.search(output) is not None


def vulnerable_runtime_detected(
    returncode: int, output: str, pattern: Pattern[str]
) -> bool:
    return returncode != 0 and diagnostic_detected(output, pattern)


def fixed_runtime_reported(returncode: int, output: str, pattern: Pattern[str]) -> bool:
    """Classify only explicit sanitizer evidence, not application exit status."""

    del returncode
    return diagnostic_detected(output, pattern)


def compile_diagnostic_pattern(expression: str) -> Pattern[str]:
    return re.compile(expression, re.IGNORECASE)