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 #include <assert.h>
29
30 #include "py/objtuple.h"
31 #include "py/runtime.h"
32
33 typedef struct _mp_obj_zip_t {
34 mp_obj_base_t base;
35 size_t n_iters;
36 mp_obj_t iters[];
37 } mp_obj_zip_t;
38
zip_make_new(const mp_obj_type_t * type,size_t n_args,size_t n_kw,const mp_obj_t * args)39 STATIC mp_obj_t zip_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
40 mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, false);
41
42 mp_obj_zip_t *o = m_new_obj_var(mp_obj_zip_t, mp_obj_t, n_args);
43 o->base.type = type;
44 o->n_iters = n_args;
45 for (size_t i = 0; i < n_args; i++) {
46 o->iters[i] = mp_getiter(args[i], NULL);
47 }
48 return MP_OBJ_FROM_PTR(o);
49 }
50
zip_iternext(mp_obj_t self_in)51 STATIC mp_obj_t zip_iternext(mp_obj_t self_in) {
52 mp_check_self(mp_obj_is_type(self_in, &mp_type_zip));
53 mp_obj_zip_t *self = MP_OBJ_TO_PTR(self_in);
54 if (self->n_iters == 0) {
55 return MP_OBJ_STOP_ITERATION;
56 }
57 mp_obj_tuple_t *tuple = MP_OBJ_TO_PTR(mp_obj_new_tuple(self->n_iters, NULL));
58
59 for (size_t i = 0; i < self->n_iters; i++) {
60 mp_obj_t next = mp_iternext(self->iters[i]);
61 if (next == MP_OBJ_STOP_ITERATION) {
62 mp_obj_tuple_del(MP_OBJ_FROM_PTR(tuple));
63 return MP_OBJ_STOP_ITERATION;
64 }
65 tuple->items[i] = next;
66 }
67 return MP_OBJ_FROM_PTR(tuple);
68 }
69
70 const mp_obj_type_t mp_type_zip = {
71 { &mp_type_type },
72 .name = MP_QSTR_zip,
73 .make_new = zip_make_new,
74 .getiter = mp_identity_getiter,
75 .iternext = zip_iternext,
76 };
77