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       1                 :            : /*
       2                 :            :  * This file is part of the MicroPython project, http://micropython.org/
       3                 :            :  *
       4                 :            :  * The MIT License (MIT)
       5                 :            :  *
       6                 :            :  * Copyright (c) 2013, 2014 Damien P. George
       7                 :            :  *
       8                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a copy
       9                 :            :  * of this software and associated documentation files (the "Software"), to deal
      10                 :            :  * in the Software without restriction, including without limitation the rights
      11                 :            :  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      12                 :            :  * copies of the Software, and to permit persons to whom the Software is
      13                 :            :  * furnished to do so, subject to the following conditions:
      14                 :            :  *
      15                 :            :  * The above copyright notice and this permission notice shall be included in
      16                 :            :  * all copies or substantial portions of the Software.
      17                 :            :  *
      18                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      19                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      20                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      21                 :            :  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      22                 :            :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      23                 :            :  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      24                 :            :  * THE SOFTWARE.
      25                 :            :  */
      26                 :            : 
      27                 :            : #include <stdlib.h>
      28                 :            : 
      29                 :            : #include "py/runtime.h"
      30                 :            : 
      31                 :            : // this is a wrapper object that turns something that has a __getitem__ method into an iterator
      32                 :            : 
      33                 :            : typedef struct _mp_obj_getitem_iter_t {
      34                 :            :     mp_obj_base_t base;
      35                 :            :     mp_obj_t args[3];
      36                 :            : } mp_obj_getitem_iter_t;
      37                 :            : 
      38                 :        108 : static mp_obj_t it_iternext(mp_obj_t self_in) {
      39                 :        108 :     mp_obj_getitem_iter_t *self = MP_OBJ_TO_PTR(self_in);
      40                 :        108 :     nlr_buf_t nlr;
      41         [ +  + ]:        108 :     if (nlr_push(&nlr) == 0) {
      42                 :            :         // try to get next item
      43                 :        108 :         mp_obj_t value = mp_call_method_n_kw(1, 0, self->args);
      44                 :         88 :         self->args[2] = MP_OBJ_NEW_SMALL_INT(MP_OBJ_SMALL_INT_VALUE(self->args[2]) + 1);
      45                 :         88 :         nlr_pop();
      46                 :         88 :         return value;
      47                 :            :     } else {
      48                 :            :         // an exception was raised
      49                 :         20 :         mp_obj_type_t *t = (mp_obj_type_t *)((mp_obj_base_t *)nlr.ret_val)->type;
      50   [ +  +  +  + ]:         20 :         if (t == &mp_type_StopIteration || t == &mp_type_IndexError) {
      51                 :            :             return MP_OBJ_STOP_ITERATION;
      52                 :            :         } else {
      53                 :            :             // re-raise exception
      54                 :          4 :             nlr_jump(nlr.ret_val);
      55                 :            :         }
      56                 :            :     }
      57                 :            : }
      58                 :            : 
      59                 :            : static MP_DEFINE_CONST_OBJ_TYPE(
      60                 :            :     mp_type_it,
      61                 :            :     MP_QSTR_iterator,
      62                 :            :     MP_TYPE_FLAG_ITER_IS_ITERNEXT,
      63                 :            :     iter, it_iternext
      64                 :            :     );
      65                 :            : 
      66                 :            : // args are those returned from mp_load_method_maybe (ie either an attribute or a method)
      67                 :         20 : mp_obj_t mp_obj_new_getitem_iter(mp_obj_t *args, mp_obj_iter_buf_t *iter_buf) {
      68                 :         20 :     assert(sizeof(mp_obj_getitem_iter_t) <= sizeof(mp_obj_iter_buf_t));
      69                 :         20 :     mp_obj_getitem_iter_t *o = (mp_obj_getitem_iter_t *)iter_buf;
      70                 :         20 :     o->base.type = &mp_type_it;
      71                 :         20 :     o->args[0] = args[0];
      72                 :         20 :     o->args[1] = args[1];
      73                 :         20 :     o->args[2] = MP_OBJ_NEW_SMALL_INT(0);
      74                 :         20 :     return MP_OBJ_FROM_PTR(o);
      75                 :            : }