circuitpython/py/objclass.c

86 lines
2.3 KiB
C

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "obj.h"
#include "runtime.h"
#include "map.h"
typedef struct _mp_obj_class_t {
mp_obj_base_t base;
mp_map_t *locals;
} mp_obj_class_t;
// args are in reverse order in the array
mp_obj_t class_call_n(mp_obj_t self_in, int n_args, const mp_obj_t *args) {
// instantiate an instance of a class
mp_obj_class_t *self = self_in;
// make instance
mp_obj_t o = mp_obj_new_instance(self_in);
// look for __init__ function
mp_map_elem_t *init_fn = mp_qstr_map_lookup(self->locals, qstr_from_str_static("__init__"), false);
if (init_fn != NULL) {
// call __init__ function
mp_obj_t init_ret;
if (n_args == 0) {
init_ret = rt_call_function_n(init_fn->value, 1, (mp_obj_t*)&o);
} else {
mp_obj_t *args2 = m_new(mp_obj_t, n_args + 1);
memcpy(args2, args, n_args * sizeof(mp_obj_t));
args2[n_args] = o;
init_ret = rt_call_function_n(init_fn->value, n_args + 1, args2);
m_del(mp_obj_t, args2, n_args + 1);
}
if (init_ret != mp_const_none) {
nlr_jump(mp_obj_new_exception_msg_1_arg(rt_q_TypeError, "__init__() should return None, not '%s'", mp_obj_get_type_str(init_ret)));
}
} else {
// TODO
if (n_args != 0) {
nlr_jump(mp_obj_new_exception_msg_1_arg(rt_q_TypeError, "function takes 0 positional arguments but %d were given", (void*)(machine_int_t)n_args));
}
}
return o;
}
mp_map_t *mp_obj_class_get_locals(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &class_type));
mp_obj_class_t *self = self_in;
return self->locals;
}
const mp_obj_type_t class_type = {
{ &mp_const_type },
"class",
NULL, // print
class_call_n, // call_n
NULL, // unary_op
NULL, // binary_op
NULL, // getiter
NULL, // iternext
{{NULL, NULL},}, // method list
};
mp_obj_t mp_obj_new_class(mp_map_t *class_locals) {
mp_obj_class_t *o = m_new_obj(mp_obj_class_t);
o->base.type = &class_type;
o->locals = class_locals;
return o;
}
// temporary way of making C modules
// hack: use class to mimic a module
mp_obj_t mp_module_new(void) {
return mp_obj_new_class(mp_map_new(MP_MAP_QSTR, 0));
}