1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
3// http://code.google.com/p/protobuf/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9//     * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11//     * Redistributions in binary form must reproduce the above
12// copyright notice, this list of conditions and the following disclaimer
13// in the documentation and/or other materials provided with the
14// distribution.
15//     * Neither the name of Google Inc. nor the names of its
16// contributors may be used to endorse or promote products derived from
17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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25// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31// Author: kenton@google.com (Kenton Varda)
32//  Based on original Protocol Buffers design by
33//  Sanjay Ghemawat, Jeff Dean, and others.
34
35#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
36#define GOOGLE_PROTOBUF_COMPILER_CPP_EXTENSION_H__
37
38#include <string>
39#include <google/protobuf/stubs/common.h>
40#include <google/protobuf/compiler/cpp/cpp_options.h>
41
42namespace google {
43namespace protobuf {
44  class FieldDescriptor;       // descriptor.h
45  namespace io {
46    class Printer;             // printer.h
47  }
48}
49
50namespace protobuf {
51namespace compiler {
52namespace cpp {
53
54// Generates code for an extension, which may be within the scope of some
55// message or may be at file scope.  This is much simpler than FieldGenerator
56// since extensions are just simple identifiers with interesting types.
57class ExtensionGenerator {
58 public:
59  // See generator.cc for the meaning of dllexport_decl.
60  explicit ExtensionGenerator(const FieldDescriptor* desycriptor,
61                              const Options& options);
62  ~ExtensionGenerator();
63
64  // Header stuff.
65  void GenerateDeclaration(io::Printer* printer);
66
67  // Source file stuff.
68  void GenerateDefinition(io::Printer* printer);
69
70  // Generate code to register the extension.
71  void GenerateRegistration(io::Printer* printer);
72
73 private:
74  const FieldDescriptor* descriptor_;
75  string type_traits_;
76  Options options_;
77
78  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ExtensionGenerator);
79};
80
81}  // namespace cpp
82}  // namespace compiler
83}  // namespace protobuf
84
85}  // namespace google
86#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_H__
87