kopia lustrzana https://github.com/micropython/micropython
93 wiersze
2.9 KiB
C
93 wiersze
2.9 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 "qstr.h"
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#include "obj.h"
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#include "runtime0.h"
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/******************************************************************************/
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/* ellipsis object, a singleton */
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typedef struct _mp_obj_ellipsis_t {
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mp_obj_base_t base;
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} mp_obj_ellipsis_t;
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void ellipsis_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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print(env, "Ellipsis");
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}
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const mp_obj_type_t ellipsis_type = {
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{ &mp_const_type },
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"ellipsis",
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.print = ellipsis_print,
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};
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STATIC const mp_obj_ellipsis_t ellipsis_obj = {{&ellipsis_type}};
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const mp_obj_t mp_const_ellipsis = (mp_obj_t)&ellipsis_obj;
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/******************************************************************************/
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/* slice object */
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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, mp_print_kind_t kind) {
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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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.print = slice_print,
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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 = 0, stop = 0;
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if (ostart != mp_const_none) {
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start = mp_obj_get_int(ostart);
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}
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if (ostop != mp_const_none) {
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stop = mp_obj_get_int(ostop);
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if (stop == 0) {
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// [x:0] is a special case - in our slice object, stop = 0 means
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// "end of sequence". Fortunately, [x:0] is an empty seqence for
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// any x (including negative). [x:x] is also always empty sequence.
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// but x also can be 0. But note that b""[x:x] is b"" for any x (i.e.
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// no IndexError, at least in Python 3.3.3). So, we just use -1's to
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// signify that. -1 is catchy "special" number in case someone will
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// try to print [x:0] slice ever.
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start = stop = -1;
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}
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}
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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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