54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
#include <stdlib.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"
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#include "runtime.h"
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// this is a wrapper object that is turns something that has a __getitem__ method into an iterator
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typedef struct _mp_obj_getitem_iter_t {
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mp_obj_base_t base;
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mp_obj_t args[3];
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} mp_obj_getitem_iter_t;
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STATIC mp_obj_t it_iternext(mp_obj_t self_in) {
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mp_obj_getitem_iter_t *self = self_in;
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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// try to get next item
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mp_obj_t value = mp_call_method_n_kw(1, 0, self->args);
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self->args[2] = MP_OBJ_NEW_SMALL_INT(MP_OBJ_SMALL_INT_VALUE(self->args[2]) + 1);
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nlr_pop();
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return value;
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} else {
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// an exception was raised
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if (mp_obj_get_type(nlr.ret_val) == &mp_type_StopIteration) {
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// return MP_OBJ_STOP_ITERATION instead of raising StopIteration
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return MP_OBJ_STOP_ITERATION;
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} else {
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// re-raise exception
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nlr_raise(nlr.ret_val);
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}
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}
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}
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STATIC const mp_obj_type_t it_type = {
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{ &mp_type_type },
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.name = MP_QSTR_iterator,
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.getiter = mp_identity,
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.iternext = it_iternext
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};
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// args are those returned from mp_load_method_maybe (ie either an attribute or a method)
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mp_obj_t mp_obj_new_getitem_iter(mp_obj_t *args) {
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mp_obj_getitem_iter_t *o = m_new_obj(mp_obj_getitem_iter_t);
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o->base.type = &it_type;
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o->args[0] = args[0];
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o->args[1] = args[1];
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o->args[2] = MP_OBJ_NEW_SMALL_INT(0);
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return o;
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}
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