objmap.c 1.59 KB
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#include <stdlib.h>
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#include <assert.h>

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#include "nlr.h"
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#include "misc.h"
#include "mpconfig.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_getiter(mp_obj_t self_in) {
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    return self_in;
}

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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_NULL) {
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            m_del(mp_obj_t, nextses, self->n_iters);
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            return MP_OBJ_NULL;
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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,
    .getiter = map_getiter,
    .iternext = map_iternext,
};