#!/usr/bin/env python3
"""Check _PyType_Name's C89 declaration and preserve strrchr evaluation order."""
import re
from pathlib import Path

source = Path("cpython/Objects/typeobject.c").read_text()
match = re.search(
    r"\nconst char \*\n_PyType_Name\(PyTypeObject \*type\)\n\{(.*?)\n\}",
    source,
    re.S,
)
assert match, "_PyType_Name definition missing"
body = match.group(1)
assert re.match(r"\s*const char \*s;\s*assert\b", body), (
    "_PyType_Name: const char *s; must be in the opening declaration block"
)
assert len(re.findall(r"\bconst char\s*\*\s*s\b", body)) == 1, (
    "_PyType_Name: declare s exactly once"
)
expected = """
    const char *s;
    assert(type->tp_name != NULL);
    s = strrchr(type->tp_name, '.');
    if (s == NULL) {
        s = type->tp_name;
    }
    else {
        s++;
    }
    return s;
"""
assert body.split() == expected.split(), (
    "_PyType_Name: preserve assertion before strrchr assignment, "
    "fallback, suffix increment, and return"
)
print("_PyType_Name s C89 declaration and unchanged evaluation order: PASS")