protobuf/python/descriptor.h

// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google LLC nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef PYUPB_DESCRIPTOR_H__
#define PYUPB_DESCRIPTOR_H__

#include <stdbool.h>

#include "python/python_api.h"
#include "upb/reflection/def.h"

typedef enum {
  kPyUpb_Descriptor = 0,
  kPyUpb_EnumDescriptor = 1,
  kPyUpb_EnumValueDescriptor = 2,
  kPyUpb_FieldDescriptor = 3,
  kPyUpb_FileDescriptor = 4,
  kPyUpb_MethodDescriptor = 5,
  kPyUpb_OneofDescriptor = 6,
  kPyUpb_ServiceDescriptor = 7,
  kPyUpb_Descriptor_Count = 8,
} PyUpb_DescriptorType;

// Given a descriptor object |desc|, returns a Python message class object for
// the msgdef |m|, which must be from the same pool.
PyObject* PyUpb_Descriptor_GetClass(const upb_MessageDef* m);

// Set the message descriptor's meta class.
void PyUpb_Descriptor_SetClass(PyObject* py_descriptor, PyObject* meta);

// Returns a Python wrapper object for the given def. This will return an
// existing object if one already exists, otherwise a new object will be
// created.  The caller always owns a ref on the returned object.
PyObject* PyUpb_Descriptor_Get(const upb_MessageDef* msgdef);
PyObject* PyUpb_EnumDescriptor_Get(const upb_EnumDef* enumdef);
PyObject* PyUpb_FieldDescriptor_Get(const upb_FieldDef* field);
PyObject* PyUpb_FileDescriptor_Get(const upb_FileDef* file);
PyObject* PyUpb_OneofDescriptor_Get(const upb_OneofDef* oneof);
PyObject* PyUpb_EnumValueDescriptor_Get(const upb_EnumValueDef* enumval);
PyObject* PyUpb_Descriptor_GetOrCreateWrapper(const upb_MessageDef* msg);
PyObject* PyUpb_ServiceDescriptor_Get(const upb_ServiceDef* s);
PyObject* PyUpb_MethodDescriptor_Get(const upb_MethodDef* s);

// Returns the underlying |def| for a given wrapper object. The caller must
// have already verified that the given Python object is of the expected type.
const upb_FileDef* PyUpb_FileDescriptor_GetDef(PyObject* file);
const upb_FieldDef* PyUpb_FieldDescriptor_GetDef(PyObject* file);
const upb_MessageDef* PyUpb_Descriptor_GetDef(PyObject* _self);
const void* PyUpb_AnyDescriptor_GetDef(PyObject* _self);

// Returns the underlying |def| for a given wrapper object. The caller must
// have already verified that the given Python object is of the expected type.
const upb_FileDef* PyUpb_FileDescriptor_GetDef(PyObject* file);

// Module-level init.
bool PyUpb_InitDescriptor(PyObject* m);

#endif  // PYUPB_DESCRIPTOR_H__