text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * SPDX-FileCopyrightText: 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 "py/runtime.h"
  
  // this is a wrapper object that turns something that has a __getitem__ method into an iterator
  
  typedef struct _mp_obj_getitem_iter_t {
      mp_obj_base_t base;
      mp_obj_t args[3];
  } mp_obj_getitem_iter_t;
  
  STATIC mp_obj_t it_iternext(mp_obj_t self_in) {
      mp_obj_getitem_iter_t *self = MP_OBJ_TO_PTR(self_in);
      nlr_buf_t nlr;
      if (nlr_push(&nlr) == 0) {
          // try to get next item
          mp_obj_t value = mp_call_method_n_kw(1, 0, self->args);
          self->args[2] = MP_OBJ_NEW_SMALL_INT(MP_OBJ_SMALL_INT_VALUE(self->args[2]) + 1);
          nlr_pop();
          return value;
      } else {
          // an exception was raised
          mp_obj_type_t *t = (mp_obj_type_t*)((mp_obj_base_t*)nlr.ret_val)->type;
          if (t == &mp_type_StopIteration || t == &mp_type_IndexError) {
              // return MP_OBJ_STOP_ITERATION instead of raising
              return MP_OBJ_STOP_ITERATION;
          } else {
              // re-raise exception
              nlr_jump(nlr.ret_val);
          }
      }
  }
  
  STATIC const mp_obj_type_t it_type = {
      { &mp_type_type },
      .name = MP_QSTR_iterator,
      .getiter = mp_identity_getiter,
      .iternext = it_iternext,
  };
  
  // args are those returned from mp_load_method_maybe (ie either an attribute or a method)
  mp_obj_t mp_obj_new_getitem_iter(mp_obj_t *args, mp_obj_iter_buf_t *iter_buf) {
      assert(sizeof(mp_obj_getitem_iter_t) <= sizeof(mp_obj_iter_buf_t));
      mp_obj_getitem_iter_t *o = (mp_obj_getitem_iter_t*)iter_buf;
      o->base.type = &it_type;
      o->args[0] = args[0];
      o->args[1] = args[1];
      o->args[2] = MP_OBJ_NEW_SMALL_INT(0);
      return MP_OBJ_FROM_PTR(o);
  }
  