circuitpython/py/proto.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Jeff Epler for Adafruit Industries
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/obj.h"
#include "py/proto.h"
#include "py/runtime.h"

#ifndef MICROPY_UNSAFE_PROTO
const void *mp_proto_get(uint16_t name, mp_const_obj_t obj) {
    const mp_obj_type_t *type = mp_obj_get_type(obj);
    if (!type->protocol) {
        return NULL;
    }
    uint16_t proto_name = *(const uint16_t *)type->protocol;
    if (proto_name == name) {
        return type->protocol;
    }
    return NULL;
}
#endif

const void *mp_proto_get_or_throw(uint16_t name, mp_const_obj_t obj) {
    const void *proto = mp_proto_get(name, obj);
    if (proto) {
        return proto;
    }
    mp_raise_TypeError_varg(translate("'%q' object does not support '%q'"),
        mp_obj_get_type_qstr(obj), name);
}