circuitpython/py/objfilter.c

54 lines
1.4 KiB
C

#include <stdlib.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
typedef struct _mp_obj_filter_t {
mp_obj_base_t base;
mp_obj_t fun;
mp_obj_t iter;
} mp_obj_filter_t;
STATIC mp_obj_t filter_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
if (n_args != 2 || n_kw != 0) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_TypeError, "filter expected 2 arguments"));
}
assert(n_args == 2);
mp_obj_filter_t *o = m_new_obj(mp_obj_filter_t);
o->base.type = &mp_type_filter;
o->fun = args[0];
o->iter = rt_getiter(args[1]);
return o;
}
STATIC mp_obj_t filter_iternext(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_filter));
mp_obj_filter_t *self = self_in;
mp_obj_t next;
while ((next = rt_iternext(self->iter)) != MP_OBJ_NULL) {
mp_obj_t val;
if (self->fun != mp_const_none) {
val = rt_call_function_n_kw(self->fun, 1, 0, &next);
} else {
val = next;
}
if (rt_is_true(val)) {
return next;
}
}
return MP_OBJ_NULL;
}
const mp_obj_type_t mp_type_filter = {
{ &mp_type_type },
.name = MP_QSTR_filter,
.make_new = filter_make_new,
.getiter = mp_identity,
.iternext = filter_iternext,
};