builtin.c

#include <stdio.h>
#include <assert.h>

#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "objstr.h"
#include "runtime0.h"
#include "runtime.h"
#include "builtin.h"

#if MICROPY_ENABLE_FLOAT
#include <math.h>
#endif

// args[0] is function from class body
// args[1] is class name
// args[2:] are base objects
STATIC mp_obj_t mp_builtin___build_class__(uint n_args, const mp_obj_t *args) {
    assert(2 <= n_args);

    // set the new classes __locals__ object
    mp_obj_dict_t *old_locals = mp_locals_get();
    mp_obj_t class_locals = mp_obj_new_dict(0);
    mp_locals_set(class_locals);

    // call the class code
    mp_obj_t cell = mp_call_function_0(args[0]);

    // restore old __locals__ object
    mp_locals_set(old_locals);

    // get the class type (meta object) from the base objects
    mp_obj_t meta;
    if (n_args == 2) {
        // no explicit bases, so use 'type'
        meta = (mp_obj_t)&mp_type_type;
    } else {
        // use type of first base object
        meta = mp_obj_get_type(args[2]);
    }

    // TODO do proper metaclass resolution for multiple base objects

    // create the new class using a call to the meta object
    mp_obj_t meta_args[3];
    meta_args[0] = args[1]; // class name
    meta_args[1] = mp_obj_new_tuple(n_args - 2, args + 2); // tuple of bases
    meta_args[2] = class_locals; // dict of members
    mp_obj_t new_class = mp_call_function_n_kw(meta, 3, 0, meta_args);

    // store into cell if neede
    if (cell != mp_const_none) {
        mp_obj_cell_set(cell, new_class);
    }

    return new_class;
}

MP_DEFINE_CONST_FUN_OBJ_VAR(mp_builtin___build_class___obj, 2, mp_builtin___build_class__);

STATIC mp_obj_t mp_builtin___repl_print__(mp_obj_t o) {
    if (o != mp_const_none) {
        mp_obj_print(o, PRINT_REPR);
        printf("\n");
    }
    return mp_const_none;
}