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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
// Author: kenton@google.com (Kenton Varda)
//
// Front-end for protoc code generator plugins written in C++.
//
// To implement a protoc plugin in C++, simply write an implementation of
// CodeGenerator, then create a main() function like:
// int main(int argc, char* argv[]) {
// MyCodeGenerator generator;
// return google::protobuf::compiler::PluginMain(argc, argv, &generator);
// }
// You must link your plugin against libprotobuf and libprotoc.
//
// The core part of PluginMain is to invoke the given CodeGenerator on a
// CodeGeneratorRequest to generate a CodeGeneratorResponse. This part is
// abstracted out and made into function GenerateCode so that it can be reused,
// for example, to implement a variant of PluginMain that does some
// preprocessing on the input CodeGeneratorRequest before feeding the request
// to the given code generator.
//
// To get protoc to use the plugin, do one of the following:
// * Place the plugin binary somewhere in the PATH and give it the name
// "protoc-gen-NAME" (replacing "NAME" with the name of your plugin). If you
// then invoke protoc with the parameter --NAME_out=OUT_DIR (again, replace
// "NAME" with your plugin's name), protoc will invoke your plugin to generate
// the output, which will be placed in OUT_DIR.
// * Place the plugin binary anywhere, with any name, and pass the --plugin
// parameter to protoc to direct it to your plugin like so:
// protoc --plugin=protoc-gen-NAME=path/to/mybinary --NAME_out=OUT_DIR
// On Windows, make sure to include the .exe suffix:
// protoc --plugin=protoc-gen-NAME=path/to/mybinary.exe --NAME_out=OUT_DIR
#ifndef GOOGLE_PROTOBUF_COMPILER_PLUGIN_H__
#define GOOGLE_PROTOBUF_COMPILER_PLUGIN_H__
#include <string>
// Must be included last.
#include "google/protobuf/port_def.inc"
namespace google {
namespace protobuf {
namespace compiler {
class CodeGenerator; // code_generator.h
class CodeGeneratorRequest;
class CodeGeneratorResponse;
// Implements main() for a protoc plugin exposing the given code generator.
PROTOC_EXPORT int PluginMain(int argc, char* argv[],
const CodeGenerator* generator);
// Generates code using the given code generator. Returns true if the code
// generation is successful. If the code generation fails, error_msg may be
// populated to describe the failure cause.
bool GenerateCode(const CodeGeneratorRequest& request,
const CodeGenerator& generator,
CodeGeneratorResponse* response, std::string* error_msg);
} // namespace compiler
} // namespace protobuf
} // namespace google
#include "google/protobuf/port_undef.inc"
#endif // GOOGLE_PROTOBUF_COMPILER_PLUGIN_H__