Function Str_like_count

python/stringzilla.c:2923–3043

    "  int: The number of occurrences of the substring.";

static PyObject *Str_like_count(PyObject *self, PyObject *const *args, Py_ssize_t positional_args_count,
                                PyObject *args_names_tuple) {
    // Fast path variables
    PyObject *haystack_obj = NULL;
    PyObject *needle_obj = NULL;
    PyObject *start_obj = NULL;
    PyObject *end_obj = NULL;
    PyObject *allowoverlap_obj = NULL;

    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 ? 1 : 2; // needle is required
    Py_ssize_t const expected_max = expected_min + 3;  // + start + end + allowoverlap

    if (total_args < expected_min || total_args > expected_max) {
        PyErr_SetString(PyExc_TypeError, "Invalid number of 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) {
        haystack_obj = self;
        if (positional_args_count >= 1) needle_obj = args[0];
        if (positional_args_count >= 2) start_obj = args[1];
        if (positional_args_count >= 3) end_obj = args[2];
        if (positional_args_count >= 4) allowoverlap_obj = args[3];
    }
    else {
        if (positional_args_count >= 1) haystack_obj = args[0];
        if (positional_args_count >= 2) needle_obj = args[1];
        if (positional_args_count >= 3) start_obj = args[2];
        if (positional_args_count >= 4) end_obj = args[3];
        if (positional_args_count >= 5) allowoverlap_obj = args[4];
    }

    // 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, "start") == 0) {
                if (start_obj) {
                    PyErr_SetString(PyExc_TypeError, "start specified twice");
                    return NULL;
                }
                start_obj = value;
            }
            else if (PyUnicode_CompareWithASCIIString(key, "end") == 0) {
                if (end_obj) {