1  /*[clinic input]
       2  preserve
       3  [clinic start generated code]*/
       4  
       5  #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
       6  #  include "pycore_gc.h"            // PyGC_Head
       7  #  include "pycore_runtime.h"       // _Py_ID()
       8  #endif
       9  
      10  
      11  PyDoc_STRVAR(enum_new__doc__,
      12  "enumerate(iterable, start=0)\n"
      13  "--\n"
      14  "\n"
      15  "Return an enumerate object.\n"
      16  "\n"
      17  "  iterable\n"
      18  "    an object supporting iteration\n"
      19  "\n"
      20  "The enumerate object yields pairs containing a count (from start, which\n"
      21  "defaults to zero) and a value yielded by the iterable argument.\n"
      22  "\n"
      23  "enumerate is useful for obtaining an indexed list:\n"
      24  "    (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
      25  
      26  static PyObject *
      27  enum_new_impl(PyTypeObject *type, PyObject *iterable, PyObject *start);
      28  
      29  static PyObject *
      30  enum_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
      31  {
      32      PyObject *return_value = NULL;
      33      #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
      34  
      35      #define NUM_KEYWORDS 2
      36      static struct {
      37          PyGC_Head _this_is_not_used;
      38          PyObject_VAR_HEAD
      39          PyObject *ob_item[NUM_KEYWORDS];
      40      } _kwtuple = {
      41          .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
      42          .ob_item = { &_Py_ID(iterable), &_Py_ID(start), },
      43      };
      44      #undef NUM_KEYWORDS
      45      #define KWTUPLE (&_kwtuple.ob_base.ob_base)
      46  
      47      #else  // !Py_BUILD_CORE
      48      #  define KWTUPLE NULL
      49      #endif  // !Py_BUILD_CORE
      50  
      51      static const char * const _keywords[] = {"iterable", "start", NULL};
      52      static _PyArg_Parser _parser = {
      53          .keywords = _keywords,
      54          .fname = "enumerate",
      55          .kwtuple = KWTUPLE,
      56      };
      57      #undef KWTUPLE
      58      PyObject *argsbuf[2];
      59      PyObject * const *fastargs;
      60      Py_ssize_t nargs = PyTuple_GET_SIZE(args);
      61      Py_ssize_t noptargs = nargs + (kwargs ? PyDict_GET_SIZE(kwargs) : 0) - 1;
      62      PyObject *iterable;
      63      PyObject *start = 0;
      64  
      65      fastargs = _PyArg_UnpackKeywords(_PyTuple_CAST(args)->ob_item, nargs, kwargs, NULL, &_parser, 1, 2, 0, argsbuf);
      66      if (!fastargs) {
      67          goto exit;
      68      }
      69      iterable = fastargs[0];
      70      if (!noptargs) {
      71          goto skip_optional_pos;
      72      }
      73      start = fastargs[1];
      74  skip_optional_pos:
      75      return_value = enum_new_impl(type, iterable, start);
      76  
      77  exit:
      78      return return_value;
      79  }
      80  
      81  PyDoc_STRVAR(reversed_new__doc__,
      82  "reversed(sequence, /)\n"
      83  "--\n"
      84  "\n"
      85  "Return a reverse iterator over the values of the given sequence.");
      86  
      87  static PyObject *
      88  reversed_new_impl(PyTypeObject *type, PyObject *seq);
      89  
      90  static PyObject *
      91  reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
      92  {
      93      PyObject *return_value = NULL;
      94      PyTypeObject *base_tp = &PyReversed_Type;
      95      PyObject *seq;
      96  
      97      if ((type == base_tp || type->tp_init == base_tp->tp_init) &&
      98          !_PyArg_NoKeywords("reversed", kwargs)) {
      99          goto exit;
     100      }
     101      if (!_PyArg_CheckPositional("reversed", PyTuple_GET_SIZE(args), 1, 1)) {
     102          goto exit;
     103      }
     104      seq = PyTuple_GET_ITEM(args, 0);
     105      return_value = reversed_new_impl(type, seq);
     106  
     107  exit:
     108      return return_value;
     109  }
     110  /*[clinic end generated code: output=aba0ddbeab1601e3 input=a9049054013a1b77]*/