59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#include <stdlib.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 "mpqstr.h"
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#include "obj.h"
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#include "runtime.h"
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typedef struct _mp_obj_filter_t {
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mp_obj_base_t base;
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mp_obj_t fun;
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mp_obj_t iter;
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} mp_obj_filter_t;
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static mp_obj_t filter_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *args) {
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/* NOTE: args are backwards */
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if (n_args != 2) {
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nlr_jump(mp_obj_new_exception_msg(MP_QSTR_TypeError, "filter expected 2 arguments"));
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}
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assert(n_args == 2);
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mp_obj_filter_t *o = m_new_obj(mp_obj_filter_t);
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o->base.type = &filter_type;
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o->fun = args[1];
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o->iter = rt_getiter(args[0]);
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return o;
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}
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static mp_obj_t filter_getiter(mp_obj_t self_in) {
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return self_in;
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}
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static mp_obj_t filter_iternext(mp_obj_t self_in) {
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assert(MP_OBJ_IS_TYPE(self_in, &filter_type));
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mp_obj_filter_t *self = self_in;
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mp_obj_t next;
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while ((next = rt_iternext(self->iter)) != mp_const_stop_iteration) {
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mp_obj_t val;
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if (self->fun != mp_const_none) {
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val = rt_call_function_n(self->fun, 1, &next);
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} else {
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val = next;
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}
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if (rt_is_true(val)) {
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return next;
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}
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}
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return mp_const_stop_iteration;
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}
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const mp_obj_type_t filter_type = {
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{ &mp_const_type },
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"filter",
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.make_new = filter_make_new,
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.getiter = filter_getiter,
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.iternext = filter_iternext,
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};
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