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/*
* 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 "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);
}
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