text: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  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 Inc. 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.
  
  // 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>
  
  #include <google/protobuf/stubs/common.h>
  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.
  LIBPROTOC_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 geneartion fails, error_msg may be
  // populated to describe the failure cause.
  bool GenerateCode(const CodeGeneratorRequest& request,
      const CodeGenerator& generator, CodeGeneratorResponse* response,
      string* error_msg);
  
  }  // namespace compiler
  }  // namespace protobuf
  
  }  // namespace google
  #endif  // GOOGLE_PROTOBUF_COMPILER_PLUGIN_H__
  