grpc/third_party/upb/protos_generator/gen_extensions.cc

// Copyright (c) 2009-2021, Google LLC
// All rights reserved.
//
// 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 Google LLC 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.

#include "protos_generator/gen_extensions.h"

#include "absl/strings/str_cat.h"
#include "protos_generator/gen_utils.h"

namespace protos_generator {

namespace protobuf = ::google::protobuf;

std::string ExtensionIdentifierBase(const protobuf::FieldDescriptor* ext) {
  assert(ext->is_extension());
  std::string ext_scope;
  if (ext->extension_scope()) {
    return MessageName(ext->extension_scope());
  } else {
    return ToCIdent(ext->file()->package());
  }
}

std::string ContainingTypeName(const protobuf::FieldDescriptor* ext) {
  return ext->containing_type()->file() != ext->file()
             ? QualifiedClassName(ext->containing_type())
             : ClassName(ext->containing_type());
}

void WriteExtensionIdentifierHeader(const protobuf::FieldDescriptor* ext,
                                    Output& output) {
  std::string mini_table_name =
      absl::StrCat(ExtensionIdentifierBase(ext), "_", ext->name(), "_ext");
  if (ext->extension_scope()) {
    output(
        R"cc(
          static const ::protos::internal::ExtensionIdentifier<$0, $1> $2;
        )cc",
        ContainingTypeName(ext), CppTypeParameterName(ext), ext->name());
  } else {
    output(
        R"cc(
          extern const ::protos::internal::ExtensionIdentifier<$0, $1> $2;
        )cc",
        ContainingTypeName(ext), CppTypeParameterName(ext), ext->name());
  }
}

void WriteExtensionIdentifiersHeader(
    const std::vector<const protobuf::FieldDescriptor*>& extensions,
    Output& output) {
  for (const auto* ext : extensions) {
    if (!ext->extension_scope()) {
      WriteExtensionIdentifierHeader(ext, output);
    }
  }
}

void WriteExtensionIdentifier(const protobuf::FieldDescriptor* ext,
                              Output& output) {
  std::string mini_table_name =
      absl::StrCat(ExtensionIdentifierBase(ext), "_", ext->name(), "_ext");
  if (ext->extension_scope()) {
    output(
        R"cc(
          const ::protos::internal::ExtensionIdentifier<$0, $3> $4::$2(&$1);
        )cc",
        ContainingTypeName(ext), mini_table_name, ext->name(),
        CppTypeParameterName(ext), ClassName(ext->extension_scope()));
  } else {
    output(
        R"cc(
          const ::protos::internal::ExtensionIdentifier<$0, $3> $2(&$1);
        )cc",
        ContainingTypeName(ext), mini_table_name, ext->name(),
        CppTypeParameterName(ext));
  }
}

void WriteExtensionIdentifiers(
    const std::vector<const protobuf::FieldDescriptor*>& extensions,
    Output& output) {
  for (const auto* ext : extensions) {
    if (!ext->extension_scope()) {
      WriteExtensionIdentifier(ext, output);
    }
  }
}

}  // namespace protos_generator