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 "py/runtime.h"
28
29#if MICROPY_PY_BUILTINS_FILTER
30
31typedef struct _mp_obj_filter_t {
32 mp_obj_base_t base;
33 mp_obj_t fun;
34 mp_obj_t iter;
35} mp_obj_filter_t;
36
37STATIC mp_obj_t filter_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
38 mp_arg_check_num(n_args, n_kw, 2, 2, false);
39 mp_obj_filter_t *o = m_new_obj(mp_obj_filter_t);
40 o->base.type = type;
41 o->fun = args[0];
42 o->iter = mp_getiter(args[1], NULL);
43 return MP_OBJ_FROM_PTR(o);
44}
45
46STATIC mp_obj_t filter_iternext(mp_obj_t self_in) {
47 mp_check_self(mp_obj_is_type(self_in, &mp_type_filter));
48 mp_obj_filter_t *self = MP_OBJ_TO_PTR(self_in);
49 mp_obj_t next;
50 while ((next = mp_iternext(self->iter)) != MP_OBJ_STOP_ITERATION) {
51 mp_obj_t val;
52 if (self->fun != mp_const_none) {
53 val = mp_call_function_n_kw(self->fun, 1, 0, &next);
54 } else {
55 val = next;
56 }
57 if (mp_obj_is_true(val)) {
58 return next;
59 }
60 }
61 return MP_OBJ_STOP_ITERATION;
62}
63
64const mp_obj_type_t mp_type_filter = {
65 { &mp_type_type },
66 .name = MP_QSTR_filter,
67 .make_new = filter_make_new,
68 .getiter = mp_identity_getiter,
69 .iternext = filter_iternext,
70};
71
72#endif // MICROPY_PY_BUILTINS_FILTER
73