objmap.c 2.74 KB
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/*
 * This file is part of the Micro Python 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.
 */

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#include <stdlib.h>
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#include <assert.h>

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#include "mpconfig.h"
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#include "nlr.h"
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#include "misc.h"
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#include "qstr.h"
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#include "obj.h"
#include "runtime.h"

typedef struct _mp_obj_map_t {
    mp_obj_base_t base;
    machine_uint_t n_iters;
    mp_obj_t fun;
    mp_obj_t iters[];
} mp_obj_map_t;

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STATIC mp_obj_t map_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
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    if (n_args < 2 || n_kw != 0) {
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        nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "map must have at least 2 arguments and no keyword arguments"));
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    }
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    assert(n_args >= 2);
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    mp_obj_map_t *o = m_new_obj_var(mp_obj_map_t, mp_obj_t, n_args - 1);
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    o->base.type = &mp_type_map;
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    o->n_iters = n_args - 1;
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    o->fun = args[0];
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    for (int i = 0; i < n_args - 1; i++) {
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        o->iters[i] = mp_getiter(args[i + 1]);
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    }
    return o;
}

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STATIC mp_obj_t map_iternext(mp_obj_t self_in) {
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    assert(MP_OBJ_IS_TYPE(self_in, &mp_type_map));
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    mp_obj_map_t *self = self_in;
    mp_obj_t *nextses = m_new(mp_obj_t, self->n_iters);

    for (int i = 0; i < self->n_iters; i++) {
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        mp_obj_t next = mp_iternext(self->iters[i]);
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        if (next == MP_OBJ_STOP_ITERATION) {
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            m_del(mp_obj_t, nextses, self->n_iters);
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            return MP_OBJ_STOP_ITERATION;
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        }
        nextses[i] = next;
    }
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    return mp_call_function_n_kw(self->fun, self->n_iters, 0, nextses);
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}

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const mp_obj_type_t mp_type_map = {
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    { &mp_type_type },
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    .name = MP_QSTR_map,
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    .make_new = map_make_new,
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    .getiter = mp_identity,
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    .iternext = map_iternext,
};