77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include "py/runtime.h"
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// this is a wrapper object that turns something that has a __getitem__ method into an iterator
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typedef struct _mp_obj_getitem_iter_t {
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mp_obj_base_t base;
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mp_obj_t args[3];
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} mp_obj_getitem_iter_t;
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STATIC mp_obj_t it_iternext(mp_obj_t self_in) {
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mp_obj_getitem_iter_t *self = MP_OBJ_TO_PTR(self_in);
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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// try to get next item
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mp_obj_t value = mp_call_method_n_kw(1, 0, self->args);
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self->args[2] = MP_OBJ_NEW_SMALL_INT(MP_OBJ_SMALL_INT_VALUE(self->args[2]) + 1);
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nlr_pop();
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return value;
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} else {
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// an exception was raised
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mp_obj_type_t *t = (mp_obj_type_t*)((mp_obj_base_t*)nlr.ret_val)->type;
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if (t == &mp_type_StopIteration || t == &mp_type_IndexError) {
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// return MP_OBJ_STOP_ITERATION instead of raising
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return MP_OBJ_STOP_ITERATION;
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} else {
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// re-raise exception
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nlr_jump(nlr.ret_val);
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}
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}
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}
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STATIC const mp_obj_type_t it_type = {
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{ &mp_type_type },
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.name = MP_QSTR_iterator,
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.getiter = mp_identity_getiter,
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.iternext = it_iternext,
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};
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// args are those returned from mp_load_method_maybe (ie either an attribute or a method)
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mp_obj_t mp_obj_new_getitem_iter(mp_obj_t *args, mp_obj_iter_buf_t *iter_buf) {
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assert(sizeof(mp_obj_getitem_iter_t) <= sizeof(mp_obj_iter_buf_t));
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mp_obj_getitem_iter_t *o = (mp_obj_getitem_iter_t*)iter_buf;
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o->base.type = &it_type;
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o->args[0] = args[0];
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o->args[1] = args[1];
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o->args[2] = MP_OBJ_NEW_SMALL_INT(0);
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return MP_OBJ_FROM_PTR(o);
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}
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