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https://github.com/licsber/micropython.git
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1c6de11f77
So far, only start and stop integer indexes are supported. Step is not supported, as well as objects of arbitrary types.
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "obj.h"
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#include "runtime0.h"
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#if MICROPY_ENABLE_SLICE
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// TODO: This implements only variant of slice with 2 integer args only.
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// CPython supports 3rd arg (step), plus args can be arbitrary Python objects.
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typedef struct _mp_obj_slice_t {
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mp_obj_base_t base;
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machine_int_t start;
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machine_int_t stop;
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} mp_obj_slice_t;
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void slice_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in) {
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mp_obj_slice_t *o = o_in;
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print(env, "slice(" INT_FMT ", " INT_FMT ")", o->start, o->stop);
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}
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const mp_obj_type_t slice_type = {
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{ &mp_const_type },
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"slice",
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slice_print,
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NULL, // call_n
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NULL, // unary_op
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NULL, // binary_op
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NULL, // getiter
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NULL, // iternext
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{ { NULL, NULL }, }, // method list
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};
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// TODO: Make sure to handle "empty" values, which are signified by None in CPython
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mp_obj_t mp_obj_new_slice(mp_obj_t ostart, mp_obj_t ostop, mp_obj_t ostep) {
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assert(ostep == NULL);
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machine_int_t start = mp_obj_get_int(ostart);
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machine_int_t stop = mp_obj_get_int(ostop);
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mp_obj_slice_t *o = m_new(mp_obj_slice_t, 1);
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o->base.type = &slice_type;
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o->start = start;
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o->stop = stop;
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return (mp_obj_t)o;
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}
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void mp_obj_slice_get(mp_obj_t self_in, machine_int_t *start, machine_int_t *stop, machine_int_t *step) {
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assert(MP_OBJ_IS_TYPE(self_in, &slice_type));
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mp_obj_slice_t *self = self_in;
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*start = self->start;
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*stop = self->stop;
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*step = 1;
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}
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#endif
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