Reorganize upb file structure
This change moves almost everything in the `upb/` directory up one level, so
that for example `upb/upb/generated_code_support.h` becomes just
`upb/generated_code_support.h`. The only exceptions I made to this were that I
left `upb/cmake` and `upb/BUILD` where they are, mostly because that avoids
conflict with other files and the current locations seem reasonable for now.
The `python/` directory is a little bit of a challenge because we had to merge
the existing directory there with `upb/python/`. I made `upb/python/BUILD` into
the BUILD file for the merged directory, and it effectively loads the contents
of the other BUILD file via `python/build_targets.bzl`, but I plan to clean
this up soon.
PiperOrigin-RevId: 568651768
diff --git a/python/descriptor_containers.h b/python/descriptor_containers.h
new file mode 100644
index 0000000..5b2b1fa
--- /dev/null
+++ b/python/descriptor_containers.h
@@ -0,0 +1,117 @@
+// 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_CONTAINERS_H__
+#define PYUPB_DESCRIPTOR_CONTAINERS_H__
+
+// This file defines immutable Python containiner types whose data comes from
+// an underlying descriptor (def).
+//
+// Because there are many instances of these types that vend different kinds of
+// data (fields, oneofs, enums, etc) these types accept a "vtable" of function
+// pointers. This saves us from having to define numerous distinct Python types
+// for each kind of data we want to vend.
+//
+// The underlying upb APIs follow a consistent pattern that allows us to use
+// those functions directly inside these vtables, greatly reducing the amount of
+// "adaptor" code we need to write.
+
+#include <stdbool.h>
+
+#include "protobuf.h"
+#include "upb/reflection/def.h"
+
+// -----------------------------------------------------------------------------
+// PyUpb_GenericSequence
+// -----------------------------------------------------------------------------
+
+// A Python object that vends a sequence of descriptors.
+
+typedef struct {
+ // Returns the number of elements in the map.
+ int (*get_elem_count)(const void* parent);
+ // Returns an element by index.
+ const void* (*index)(const void* parent, int idx);
+ // Returns a Python object wrapping this element, caller owns a ref.
+ PyObject* (*get_elem_wrapper)(const void* elem);
+} PyUpb_GenericSequence_Funcs;
+
+// Returns a new GenericSequence. The vtable `funcs` must outlive this object
+// (generally it should be static). The GenericSequence will take a ref on
+// `parent_obj`, which must be sufficient to keep `parent` alive. The object
+// `parent` will be passed as an argument to the functions in `funcs`.
+PyObject* PyUpb_GenericSequence_New(const PyUpb_GenericSequence_Funcs* funcs,
+ const void* parent, PyObject* parent_obj);
+
+// -----------------------------------------------------------------------------
+// PyUpb_ByNameMap
+// -----------------------------------------------------------------------------
+
+// A Python object that vends a name->descriptor map.
+
+typedef struct {
+ PyUpb_GenericSequence_Funcs base;
+ // Looks up by name and returns either a pointer to the element or NULL.
+ const void* (*lookup)(const void* parent, const char* key);
+ // Returns the name associated with this element.
+ const char* (*get_elem_name)(const void* elem);
+} PyUpb_ByNameMap_Funcs;
+
+// Returns a new ByNameMap. The vtable `funcs` must outlive this object
+// (generally it should be static). The ByNameMap will take a ref on
+// `parent_obj`, which must be sufficient to keep `parent` alive. The object
+// `parent` will be passed as an argument to the functions in `funcs`.
+PyObject* PyUpb_ByNameMap_New(const PyUpb_ByNameMap_Funcs* funcs,
+ const void* parent, PyObject* parent_obj);
+
+// -----------------------------------------------------------------------------
+// PyUpb_ByNumberMap
+// -----------------------------------------------------------------------------
+
+// A Python object that vends a number->descriptor map.
+
+typedef struct {
+ PyUpb_GenericSequence_Funcs base;
+ // Looks up by name and returns either a pointer to the element or NULL.
+ const void* (*lookup)(const void* parent, int num);
+ // Returns the name associated with this element.
+ int (*get_elem_num)(const void* elem);
+} PyUpb_ByNumberMap_Funcs;
+
+// Returns a new ByNumberMap. The vtable `funcs` must outlive this object
+// (generally it should be static). The ByNumberMap will take a ref on
+// `parent_obj`, which must be sufficient to keep `parent` alive. The object
+// `parent` will be passed as an argument to the functions in `funcs`.
+PyObject* PyUpb_ByNumberMap_New(const PyUpb_ByNumberMap_Funcs* funcs,
+ const void* parent, PyObject* parent_obj);
+
+bool PyUpb_InitDescriptorContainers(PyObject* m);
+
+#endif // PYUPB_DESCRIPTOR_CONTAINERS_H__
