cpp_file.h

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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__
#define GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__

#include <memory>
#ifndef _SHARED_PTR_H
#include <google/protobuf/stubs/shared_ptr.h>
#endif
#include <string>
#include <vector>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/compiler/cpp/cpp_field.h>
#include <google/protobuf/compiler/cpp/cpp_options.h>

namespace google {
namespace protobuf {
  class FileDescriptor;        // descriptor.h
  namespace io {
    class Printer;             // printer.h
  }
}

namespace protobuf {
namespace compiler {
namespace cpp {

class EnumGenerator;           // enum.h
class MessageGenerator;        // message.h
class ServiceGenerator;        // service.h
class ExtensionGenerator;      // extension.h

class FileGenerator {
 public:
  // See generator.cc for the meaning of dllexport_decl.
  FileGenerator(const FileDescriptor* file, const Options& options);
  ~FileGenerator();

  // info_path, if non-empty, should be the path (relative to printer's output)
  // to the metadata file describing this proto header.
  void GenerateProtoHeader(io::Printer* printer,
                           const string& info_path);
  // info_path, if non-empty, should be the path (relative to printer's output)
  // to the metadata file describing this PB header.
  void GeneratePBHeader(io::Printer* printer,
                        const string& info_path);
  void GenerateSource(io::Printer* printer);

 private:
  // Internal type used by GenerateForwardDeclarations (defined in file.cc).
  class ForwardDeclarations;

  // Generate the BuildDescriptors() procedure, which builds all descriptors
  // for types defined in the file.
  void GenerateBuildDescriptors(io::Printer* printer);

  void GenerateNamespaceOpeners(io::Printer* printer);
  void GenerateNamespaceClosers(io::Printer* printer);

  // For other imports, generates their forward-declarations.
  void GenerateForwardDeclarations(io::Printer* printer);

  // Internal helper used by GenerateForwardDeclarations: fills 'decls'
  // with all necessary forward-declarations for this file and its
  // transient depednencies.
  void FillForwardDeclarations(ForwardDeclarations* decls);

  // Generates top or bottom of a header file.
  void GenerateTopHeaderGuard(io::Printer* printer,
                              const string& filename_identifier);
  void GenerateBottomHeaderGuard(io::Printer* printer,
                                 const string& filename_identifier);

  // Generates #include directives.
  void GenerateLibraryIncludes(io::Printer* printer);
  void GenerateDependencyIncludes(io::Printer* printer);

  // Generate a pragma to pull in metadata using the given info_path (if
  // non-empty). info_path should be relative to printer's output.
  void GenerateMetadataPragma(io::Printer* printer, const string& info_path);

  // Generates a couple of different pieces before definitions:
  void GenerateGlobalStateFunctionDeclarations(io::Printer* printer);

  // Generates types for classes.
  void GenerateMessageDefinitions(io::Printer* printer);

  // Generates forward-declarations for just this file's classes. This is
  // used for .pb.h headers, but not in proto_h mode.
  void GenerateMessageForwardDeclarations(io::Printer* printer);

  // Fills in types for forward declarations. This is used internally, and
  // also by other FileGenerators to determine imports' declarations.
  void FillMessageForwardDeclarations(ForwardDeclarations* decls);
  void FillMessageDefinitions(ForwardDeclarations* decls);

  // Generates enum definitions.
  void GenerateEnumForwardDeclarations(io::Printer* printer);
  void FillEnumForwardDeclarations(ForwardDeclarations* decls);
  void GenerateEnumDefinitions(io::Printer* printer);

  // Generates generic service definitions.
  void GenerateServiceDefinitions(io::Printer* printer);

  // Generates extension identifiers.
  void GenerateExtensionIdentifiers(io::Printer* printer);

  // Generates inline function defintions.
  void GenerateInlineFunctionDefinitions(io::Printer* printer);

  void GenerateProto2NamespaceEnumSpecializations(io::Printer* printer);

  const FileDescriptor* file_;
  const Options options_;

  google::protobuf::scoped_array<google::protobuf::scoped_ptr<MessageGenerator> > message_generators_;
  google::protobuf::scoped_array<google::protobuf::scoped_ptr<EnumGenerator> > enum_generators_;
  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ServiceGenerator> > service_generators_;
  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ExtensionGenerator> > extension_generators_;

  // E.g. if the package is foo.bar, package_parts_ is {"foo", "bar"}.
  vector<string> package_parts_;

  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
};

}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf

}  // namespace google
#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__