Function Str_like_hash

python/stringzilla.c:1255–1331

    "  >>> def hash(text, seed=0, /) -> int: ...";

static PyObject *Str_like_hash(PyObject *self, PyObject *const *args, Py_ssize_t positional_args_count,
                               PyObject *args_names_tuple) {
    // Fast path variables
    PyObject *text_obj = NULL;
    PyObject *seed_obj = NULL;
    sz_string_view_t text;
    sz_u64_t seed = 0;

    // Check if this is a method call on a Str instance
    int const is_member = self != NULL && PyObject_TypeCheck(self, &StrType);

    // Fast argument validation
    Py_ssize_t const args_names_count = args_names_tuple ? PyTuple_Size(args_names_tuple) : 0;
    Py_ssize_t const total_args = positional_args_count + args_names_count;
    Py_ssize_t const expected_min = is_member ? 0 : 1;
    Py_ssize_t const expected_max = expected_min + 1;

    if (total_args < expected_min || total_args > expected_max) {
        PyErr_SetString(PyExc_TypeError, is_member ? "hash() takes 0 or 1 positional arguments"
                                                   : "hash() takes 1 or 2 positional arguments");
        return NULL;
    }

    if (positional_args_count > expected_max) {
        PyErr_SetString(PyExc_TypeError, "Too many positional arguments");
        return NULL;
    }

    // Fast positional argument extraction
    if (is_member) {
        text_obj = self;
        if (positional_args_count >= 1) seed_obj = args[0];
    }
    else {
        if (positional_args_count >= 1) text_obj = args[0];
        if (positional_args_count >= 2) seed_obj = args[1];
    }

    // Fast keyword argument parsing
    if (args_names_count > 0) {
        for (Py_ssize_t i = 0; i < args_names_count; ++i) {
            PyObject *const key = PyTuple_GetItem(args_names_tuple, i);
            PyObject *const value = args[positional_args_count + i];

            if (PyUnicode_CompareWithASCIIString(key, "seed") == 0) {
                if (seed_obj) {
                    PyErr_SetString(PyExc_TypeError, "seed specified twice");
                    return NULL;
                }
                seed_obj = value;
            }
            else {
                PyErr_Format(PyExc_TypeError, "unexpected keyword argument: %S", key);
                return NULL;
            }
        }
    }