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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/logging.h>
52#include <google/protobuf/stubs/common.h>
53#include <google/protobuf/compiler/plugin.pb.h>
54#include <google/protobuf/compiler/code_generator.h>
55#include <google/protobuf/descriptor.h>
56#include <google/protobuf/io/zero_copy_stream_impl.h>
57
58
59namespace google {
60namespace protobuf {
61namespace compiler {
62
63class GeneratorResponseContext : public GeneratorContext {
64 public:
65  GeneratorResponseContext(CodeGeneratorResponse* response,
66                           const vector<const FileDescriptor*>& parsed_files)
67      : response_(response),
68        parsed_files_(parsed_files) {}
69  virtual ~GeneratorResponseContext() {}
70
71  // implements GeneratorContext --------------------------------------
72
73  virtual io::ZeroCopyOutputStream* Open(const string& filename) {
74    CodeGeneratorResponse::File* file = response_->add_file();
75    file->set_name(filename);
76    return new io::StringOutputStream(file->mutable_content());
77  }
78
79  virtual io::ZeroCopyOutputStream* OpenForInsert(
80      const string& filename, const string& insertion_point) {
81    CodeGeneratorResponse::File* file = response_->add_file();
82    file->set_name(filename);
83    file->set_insertion_point(insertion_point);
84    return new io::StringOutputStream(file->mutable_content());
85  }
86
87  void ListParsedFiles(vector<const FileDescriptor*>* output) {
88    *output = parsed_files_;
89  }
90
91 private:
92  CodeGeneratorResponse* response_;
93  const vector<const FileDescriptor*>& parsed_files_;
94};
95
96bool GenerateCode(const CodeGeneratorRequest& request,
97    const CodeGenerator& generator, CodeGeneratorResponse* response,
98    string* error_msg) {
99  DescriptorPool pool;
100  for (int i = 0; i < request.proto_file_size(); i++) {
101    const FileDescriptor* file = pool.BuildFile(request.proto_file(i));
102    if (file == NULL) {
103      // BuildFile() already wrote an error message.
104      return false;
105    }
106  }
107
108  vector<const FileDescriptor*> parsed_files;
109  for (int i = 0; i < request.file_to_generate_size(); i++) {
110    parsed_files.push_back(pool.FindFileByName(request.file_to_generate(i)));
111    if (parsed_files.back() == NULL) {
112      *error_msg = "protoc asked plugin to generate a file but "
113                   "did not provide a descriptor for the file: " +
114                   request.file_to_generate(i);
115      return false;
116    }
117  }
118
119  GeneratorResponseContext context(response, parsed_files);
120
121  if (generator.HasGenerateAll()) {
122    string error;
123    bool succeeded = generator.GenerateAll(
124        parsed_files, request.parameter(), &context, &error);
125
126    if (!succeeded && error.empty()) {
127      error = "Code generator returned false but provided no error "
128              "description.";
129    }
130    if (!error.empty()) {
131      response->set_error(error);
132    }
133  } else {
134    for (int i = 0; i < parsed_files.size(); i++) {
135      const FileDescriptor* file = parsed_files[i];
136
137      string error;
138      bool succeeded = generator.Generate(
139          file, request.parameter(), &context, &error);
140
141      if (!succeeded && error.empty()) {
142        error = "Code generator returned false but provided no error "
143                "description.";
144      }
145      if (!error.empty()) {
146        response->set_error(file->name() + ": " + error);
147        break;
148      }
149    }
150  }
151
152  return true;
153}
154
155int PluginMain(int argc, char* argv[], const CodeGenerator* generator) {
156
157  if (argc > 1) {
158    std::cerr << argv[0] << ": Unknown option: " << argv[1] << std::endl;
159    return 1;
160  }
161
162#ifdef _WIN32
163  _setmode(STDIN_FILENO, _O_BINARY);
164  _setmode(STDOUT_FILENO, _O_BINARY);
165#endif
166
167  CodeGeneratorRequest request;
168  if (!request.ParseFromFileDescriptor(STDIN_FILENO)) {
169    std::cerr << argv[0] << ": protoc sent unparseable request to plugin."
170              << std::endl;
171    return 1;
172  }
173
174  string error_msg;
175  CodeGeneratorResponse response;
176
177  if (GenerateCode(request, *generator, &response, &error_msg)) {
178    if (!response.SerializeToFileDescriptor(STDOUT_FILENO)) {
179      std::cerr << argv[0] << ": Error writing to stdout." << std::endl;
180      return 1;
181    }
182  } else {
183    if (!error_msg.empty()) {
184      std::cerr << argv[0] << ": " << error_msg << std::endl;
185    }
186    return 1;
187  }
188
189  return 0;
190}
191
192}  // namespace compiler
193}  // namespace protobuf
194}  // namespace google
195