#!/usr/bin/env python3
"""Check frozenset_vectorcall's C89 declarations and evaluation order."""
import re
import sys
from pathlib import Path

source = Path(sys.argv[1]).read_text()
match = re.search(
    r"static PyObject \*\nfrozenset_vectorcall\(PyObject \*type, PyObject \* const\*args,"
    r"\s*size_t nargsf, PyObject \*kwnames\)\n\{(.*?)\n\}",
    source,
    re.S,
)
assert match, "frozenset_vectorcall not found"
body = match.group(1)
assert re.match(r"\s*Py_ssize_t nargs;\s*PyObject \*iterable;", body), (
    "nargs and iterable must be declared without initializers in the initial block"
)
expected = """
    Py_ssize_t nargs;
    PyObject *iterable;

    if (!_PyArg_NoKwnames("frozenset", kwnames)) {
        return NULL;
    }

    nargs = PyVectorcall_NARGS(nargsf);
    if (!_PyArg_CheckPositional("frozenset", nargs, 0, 1)) {
        return NULL;
    }

    iterable = (nargs ? args[0] : NULL);
    return make_new_frozenset(_PyType_CAST(type), iterable);
"""
assert re.sub(r"\s+", "", body) == re.sub(r"\s+", "", expected), (
    "preserve keyword rejection, nargs evaluation, positional rejection, guarded "
    "iterable evaluation, and construction in their original order"
)
print("frozenset_vectorcall C89 declarations and evaluation order: PASS")