text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013, 2014 Damien P. George
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include <stdlib.h>
  #include <assert.h>
  
  #include "py/runtime.h"
  
  #if MICROPY_PY_BUILTINS_ENUMERATE
  
  typedef struct _mp_obj_enumerate_t {
      mp_obj_base_t base;
      mp_obj_t iter;
      mp_int_t cur;
  } mp_obj_enumerate_t;
  
  STATIC mp_obj_t enumerate_iternext(mp_obj_t self_in);
  
  STATIC mp_obj_t enumerate_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
      #if MICROPY_CPYTHON_COMPAT
      static const mp_arg_t allowed_args[] = {
          { MP_QSTR_iterable, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
          { MP_QSTR_start, MP_ARG_INT, {.u_int = 0} },
      };
  
      // parse args
      struct {
          mp_arg_val_t iterable, start;
      } arg_vals;
      mp_arg_parse_all_kw_array(n_args, n_kw, args,
          MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t *)&arg_vals);
  
      // create enumerate object
      mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
      o->base.type = type;
      o->iter = mp_getiter(arg_vals.iterable.u_obj, NULL);
      o->cur = arg_vals.start.u_int;
      #else
      mp_arg_check_num(n_args, n_kw, 1, 2, false);
      mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
      o->base.type = type;
      o->iter = mp_getiter(args[0], NULL);
      o->cur = n_args > 1 ? mp_obj_get_int(args[1]) : 0;
      #endif
  
      return MP_OBJ_FROM_PTR(o);
  }
  
  const mp_obj_type_t mp_type_enumerate = {
      { &mp_type_type },
      .name = MP_QSTR_enumerate,
      .make_new = enumerate_make_new,
      .iternext = enumerate_iternext,
      .getiter = mp_identity_getiter,
  };
  
  STATIC mp_obj_t enumerate_iternext(mp_obj_t self_in) {
      assert(mp_obj_is_type(self_in, &mp_type_enumerate));
      mp_obj_enumerate_t *self = MP_OBJ_TO_PTR(self_in);
      mp_obj_t next = mp_iternext(self->iter);
      if (next == MP_OBJ_STOP_ITERATION) {
          return MP_OBJ_STOP_ITERATION;
      } else {
          mp_obj_t items[] = {MP_OBJ_NEW_SMALL_INT(self->cur++), next};
          return mp_obj_new_tuple(2, items);
      }
  }
  
  #endif // MICROPY_PY_BUILTINS_ENUMERATE
  