/*[clinic input]

preserve

[clinic start generated code]*/

#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)

#  include "pycore_gc.h"          // PyGC_Head

#  include "pycore_runtime.h"     // _Py_ID()

#endif

#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()

PyDoc_STRVAR(enum_new__doc__,

"enumerate(iterable, start=0)\n"

"--\n"

"\n"

"Return an enumerate object.\n"

"\n"

"  iterable\n"

"    an object supporting iteration\n"

"\n"

"The enumerate object yields pairs containing a count (from start, which\n"

"defaults to zero) and a value yielded by the iterable argument.\n"

"\n"

"enumerate is useful for obtaining an indexed list:\n"

"    (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");

static PyObject *

enum_new_impl(PyTypeObject *type, PyObject *iterable, PyObject *start);

static PyObject *

enum_new_helper(PyTypeObject *type, PyObject *const *args,

    Py_ssize_t nargs, Py_ssize_t nkw, PyObject *kwargs, PyObject *kwnames)

{

    PyObject *return_value = NULL;

    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)

    #define NUM_KEYWORDS 2

    static struct {

        PyGC_Head _this_is_not_used;

        PyObject_VAR_HEAD

        Py_hash_t ob_hash;

        PyObject *ob_item[NUM_KEYWORDS];

    } _kwtuple = {

        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)

        .ob_hash = -1,

        .ob_item = { &_Py_ID(iterable), &_Py_ID(start), },

    };

    #undef NUM_KEYWORDS

    #define KWTUPLE (&_kwtuple.ob_base.ob_base)

    #else  // !Py_BUILD_CORE

    #  define KWTUPLE NULL

    #endif  // !Py_BUILD_CORE

    static const char * const _keywords[] = {"iterable", "start", NULL};

    static _PyArg_Parser _parser = {

        .keywords = _keywords,

        .fname = "enumerate",

        .kwtuple = KWTUPLE,

    };

    #undef KWTUPLE

    PyObject *argsbuf[2];

    PyObject * const *fastargs;

    Py_ssize_t noptargs = nargs + nkw - 1;

    PyObject *iterable;

    PyObject *start = 0;

    fastargs = _PyArg_UnpackKeywords(args, nargs, kwargs, kwnames, &_parser,

            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);

    if (!fastargs) {

        goto exit;

    }

    iterable = fastargs[0];

    if (!noptargs) {

        goto skip_optional_pos;

    }

    start = fastargs[1];

skip_optional_pos:

    return_value = enum_new_impl(type, iterable, start);

exit:

    return return_value;

}

static PyObject *

enum_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)

{

    return enum_new_helper(type, _PyTuple_CAST(args)->ob_item,

        PyTuple_GET_SIZE(args),

        kwargs ? PyDict_GET_SIZE(kwargs) : 0,

        kwargs, NULL);

}

static PyObject *

enum_vectorcall(PyObject *type, PyObject *const *args,

    size_t nargsf, PyObject *kwnames)

{

    PyObject *return_value = NULL;

    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);

    PyObject *iterable;

    PyObject *start = 0;

    assert(Py_Is(_PyType_CAST(type), &PyEnum_Type));

    /* Make sure the type object is immutable: the generated

     * vectorcall doesn't deal e.g. with users reassigning __init__. */

    assert(PyType_HasFeature(_PyType_CAST(type), Py_TPFLAGS_IMMUTABLETYPE));

    if (kwnames != NULL || nargs < 1 || nargs > 2) {

        return enum_new_helper(_PyType_CAST(type), args, nargs,

            kwnames ? PyTuple_GET_SIZE(kwnames) : 0,

            NULL, kwnames);

    }

    iterable = args[0];

    if (nargs < 2) {

        goto skip_optional;

    }

    start = args[1];

skip_optional:

    return_value = enum_new_impl(_PyType_CAST(type), iterable, start);

    return return_value;

}

PyDoc_STRVAR(reversed_new__doc__,

"reversed(object, /)\n"

"--\n"

"\n"

"Return a reverse iterator over the values of the given sequence.");

static PyObject *

reversed_new_impl(PyTypeObject *type, PyObject *seq);

static PyObject *

reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)

{

    PyObject *return_value = NULL;

    PyTypeObject *base_tp = &PyReversed_Type;

    PyObject *seq;

    if ((type == base_tp || type->tp_init == base_tp->tp_init) &&

        !_PyArg_NoKeywords("reversed", kwargs)) {

        goto exit;

    }

    if (!_PyArg_CheckPositional("reversed", PyTuple_GET_SIZE(args), 1, 1)) {

        goto exit;

    }

    seq = PyTuple_GET_ITEM(args, 0);

    return_value = reversed_new_impl(type, seq);

exit:

    return return_value;

}

static PyObject *

reversed_vectorcall(PyObject *type, PyObject *const *args,

    size_t nargsf, PyObject *kwnames)

{

    PyObject *return_value = NULL;

    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);

    PyObject *seq;

    assert(Py_Is(_PyType_CAST(type), &PyReversed_Type));

    /* Make sure the type object is immutable: the generated

     * vectorcall doesn't deal e.g. with users reassigning __init__. */

    assert(PyType_HasFeature(_PyType_CAST(type), Py_TPFLAGS_IMMUTABLETYPE));

    if (!_PyArg_NoKwnames("reversed", kwnames)) {

        goto exit;

    }

    if (!_PyArg_CheckPositional("reversed", nargs, 1, 1)) {

        goto exit;

    }

    seq = args[0];

    return_value = reversed_new_impl(_PyType_CAST(type), seq);

exit:

    return return_value;

}

/*[clinic end generated code: output=d0c066334eeb3b17 input=a9049054013a1b77]*/