plugin.cc revision d0332953cda33fb4f8e24ebff9c49159b69c43d6 
1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
3// http://code.google.com/p/protobuf/
4//
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6// modification, are permitted provided that the following conditions are
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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
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13// in the documentation and/or other materials provided with the
14// distribution.
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17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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30
31// Author: kenton@google.com (Kenton Varda)
32
33#include <google/protobuf/compiler/plugin.h>
34
35#include <iostream>
36#include <set>
37
38#ifdef _WIN32
39#include <io.h>
40#include <fcntl.h>
41#ifndef STDIN_FILENO
42#define STDIN_FILENO 0
43#endif
44#ifndef STDOUT_FILENO
45#define STDOUT_FILENO 1
46#endif
47#else
48#include <unistd.h>
49#endif
50
51#include <google/protobuf/stubs/common.h>
52#include <google/protobuf/compiler/plugin.pb.h>
53#include <google/protobuf/compiler/code_generator.h>
54#include <google/protobuf/descriptor.h>
55#include <google/protobuf/io/zero_copy_stream_impl.h>
56
57
58namespace google {
59namespace protobuf {
60namespace compiler {
61
62class GeneratorResponseOutputDirectory : public OutputDirectory {
63 public:
64  GeneratorResponseOutputDirectory(CodeGeneratorResponse* response)
65      : response_(response) {}
66  virtual ~GeneratorResponseOutputDirectory() {}
67
68  // implements OutputDirectory --------------------------------------
69
70  virtual io::ZeroCopyOutputStream* Open(const string& filename) {
71    CodeGeneratorResponse::File* file = response_->add_file();
72    file->set_name(filename);
73    return new io::StringOutputStream(file->mutable_content());
74  }
75
76  virtual io::ZeroCopyOutputStream* OpenForInsert(
77      const string& filename, const string& insertion_point) {
78    CodeGeneratorResponse::File* file = response_->add_file();
79    file->set_name(filename);
80    file->set_insertion_point(insertion_point);
81    return new io::StringOutputStream(file->mutable_content());
82  }
83
84 private:
85  CodeGeneratorResponse* response_;
86};
87
88int PluginMain(int argc, char* argv[], const CodeGenerator* generator) {
89
90  if (argc > 1) {
91    cerr << argv[0] << ": Unknown option: " << argv[1] << endl;
92    return 1;
93  }
94
95#ifdef _WIN32
96  _setmode(STDIN_FILENO, _O_BINARY);
97  _setmode(STDOUT_FILENO, _O_BINARY);
98#endif
99
100  CodeGeneratorRequest request;
101  if (!request.ParseFromFileDescriptor(STDIN_FILENO)) {
102    cerr << argv[0] << ": protoc sent unparseable request to plugin." << endl;
103    return 1;
104  }
105
106  DescriptorPool pool;
107  for (int i = 0; i < request.proto_file_size(); i++) {
108    const FileDescriptor* file = pool.BuildFile(request.proto_file(i));
109    if (file == NULL) {
110      // BuildFile() already wrote an error message.
111      return 1;
112    }
113  }
114
115  CodeGeneratorResponse response;
116  GeneratorResponseOutputDirectory output_directory(&response);
117
118  for (int i = 0; i < request.file_to_generate_size(); i++) {
119    const FileDescriptor* file =
120        pool.FindFileByName(request.file_to_generate(i));
121    if (file == NULL) {
122      cerr << argv[0] << ": protoc asked plugin to generate a file but "
123              "did not provide a descriptor for the file: "
124           << request.file_to_generate(i) << endl;
125      return 1;
126    }
127
128    string error;
129    bool succeeded = generator->Generate(
130        file, request.parameter(), &output_directory, &error);
131
132    if (!succeeded && error.empty()) {
133      error = "Code generator returned false but provided no error "
134              "description.";
135    }
136    if (!error.empty()) {
137      response.set_error(file->name() + ": " + error);
138      break;
139    }
140  }
141
142  if (!response.SerializeToFileDescriptor(STDOUT_FILENO)) {
143    cerr << argv[0] << ": Error writing to stdout." << endl;
144    return 1;
145  }
146
147  return 0;
148}
149
150}  // namespace compiler
151}  // namespace protobuf
152}  // namespace google
153