flatc.cpp
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/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "flatbuffers/flatbuffers.h"
#include "flatbuffers/idl.h"
#include "flatbuffers/util.h"
static void Error(const char *err, const char *obj = nullptr,
bool usage = false, bool show_exe_name = true);
namespace flatbuffers {
bool GenerateBinary(const Parser &parser,
const std::string &path,
const std::string &file_name,
const GeneratorOptions & /*opts*/) {
auto ext = parser.file_extension_.length() ? parser.file_extension_ : "bin";
return !parser.builder_.GetSize() ||
flatbuffers::SaveFile(
(path + file_name + "." + ext).c_str(),
reinterpret_cast<char *>(parser.builder_.GetBufferPointer()),
parser.builder_.GetSize(),
true);
}
bool GenerateTextFile(const Parser &parser,
const std::string &path,
const std::string &file_name,
const GeneratorOptions &opts) {
if (!parser.builder_.GetSize()) return true;
if (!parser.root_struct_def) Error("root_type not set");
std::string text;
GenerateText(parser, parser.builder_.GetBufferPointer(), opts,
&text);
return flatbuffers::SaveFile((path + file_name + ".json").c_str(),
text,
false);
}
}
// This struct allows us to create a table of all possible output generators
// for the various programming languages and formats we support.
struct Generator {
bool (*generate)(const flatbuffers::Parser &parser,
const std::string &path,
const std::string &file_name,
const flatbuffers::GeneratorOptions &opts);
const char *opt;
const char *name;
flatbuffers::GeneratorOptions::Language lang;
const char *help;
};
const Generator generators[] = {
{ flatbuffers::GenerateBinary, "-b", "binary",
flatbuffers::GeneratorOptions::kMAX,
"Generate wire format binaries for any data definitions" },
{ flatbuffers::GenerateTextFile, "-t", "text",
flatbuffers::GeneratorOptions::kMAX,
"Generate text output for any data definitions" },
{ flatbuffers::GenerateCPP, "-c", "C++",
flatbuffers::GeneratorOptions::kMAX,
"Generate C++ headers for tables/structs" },
{ flatbuffers::GenerateGo, "-g", "Go",
flatbuffers::GeneratorOptions::kMAX,
"Generate Go files for tables/structs" },
{ flatbuffers::GenerateGeneral, "-j", "Java",
flatbuffers::GeneratorOptions::kJava,
"Generate Java classes for tables/structs" },
{ flatbuffers::GenerateGeneral, "-n", "C#",
flatbuffers::GeneratorOptions::kCSharp,
"Generate C# classes for tables/structs" }
};
const char *program_name = NULL;
static void Error(const char *err, const char *obj, bool usage,
bool show_exe_name) {
if (show_exe_name) printf("%s: ", program_name);
printf("%s", err);
if (obj) printf(": %s", obj);
printf("\n");
if (usage) {
printf("usage: %s [OPTION]... FILE... [-- FILE...]\n", program_name);
for (size_t i = 0; i < sizeof(generators) / sizeof(generators[0]); ++i)
printf(" %s %s.\n", generators[i].opt, generators[i].help);
printf(
" -o PATH Prefix PATH to all generated files.\n"
" -I PATH Search for includes in the specified path.\n"
" --strict-json Strict JSON: add quotes to field names.\n"
" --no-prefix Don\'t prefix enum values with the enum type in C++.\n"
" --gen-includes Generate include statements for included schemas the\n"
" generated file depends on (C++).\n"
" --proto Input is a .proto, translate to .fbs.\n"
"FILEs may depend on declarations in earlier files.\n"
"FILEs after the -- must be binary flatbuffer format files.\n"
"Output files are named using the base file name of the input,"
"and written to the current directory or the path given by -o.\n"
"example: %s -c -b schema1.fbs schema2.fbs data.json\n",
program_name);
}
exit(1);
}
int main(int argc, const char *argv[]) {
program_name = argv[0];
flatbuffers::GeneratorOptions opts;
std::string output_path;
const size_t num_generators = sizeof(generators) / sizeof(generators[0]);
bool generator_enabled[num_generators] = { false };
bool any_generator = false;
bool proto_mode = false;
std::vector<std::string> filenames;
std::vector<const char *> include_directories;
size_t binary_files_from = std::numeric_limits<size_t>::max();
for (int i = 1; i < argc; i++) {
const char *arg = argv[i];
if (arg[0] == '-') {
if (filenames.size() && arg[1] != '-')
Error("invalid option location", arg, true);
std::string opt = arg;
if (opt == "-o") {
if (++i >= argc) Error("missing path following", arg, true);
output_path = flatbuffers::ConCatPathFileName(argv[i], "");
} else if(opt == "-I") {
if (++i >= argc) Error("missing path following", arg, true);
include_directories.push_back(argv[i]);
} else if(opt == "--strict-json") {
opts.strict_json = true;
} else if(opt == "--no-prefix") {
opts.prefixed_enums = false;
} else if(opt == "--gen-includes") {
opts.include_dependence_headers = true;
} else if(opt == "--") { // Separator between text and binary inputs.
binary_files_from = filenames.size();
} else if(opt == "--proto") {
proto_mode = true;
any_generator = true;
} else {
for (size_t j = 0; j < num_generators; ++j) {
if(opt == generators[j].opt) {
generator_enabled[j] = true;
any_generator = true;
goto found;
}
}
Error("unknown commandline argument", arg, true);
found:;
}
} else {
filenames.push_back(argv[i]);
}
}
if (!filenames.size()) Error("missing input files", nullptr, true);
if (!any_generator)
Error("no options: no output files generated.",
"specify one of -c -g -j -t -b etc.", true);
// Now process the files:
flatbuffers::Parser parser(proto_mode);
for (auto file_it = filenames.begin();
file_it != filenames.end();
++file_it) {
std::string contents;
if (!flatbuffers::LoadFile(file_it->c_str(), true, &contents))
Error("unable to load file", file_it->c_str());
bool is_binary = static_cast<size_t>(file_it - filenames.begin()) >=
binary_files_from;
if (is_binary) {
parser.builder_.Clear();
parser.builder_.PushBytes(
reinterpret_cast<const uint8_t *>(contents.c_str()),
contents.length());
} else {
auto local_include_directory = flatbuffers::StripFileName(*file_it);
include_directories.push_back(local_include_directory.c_str());
include_directories.push_back(nullptr);
if (!parser.Parse(contents.c_str(), &include_directories[0],
file_it->c_str()))
Error(parser.error_.c_str(), nullptr, false, false);
include_directories.pop_back();
include_directories.pop_back();
}
std::string filebase = flatbuffers::StripPath(
flatbuffers::StripExtension(*file_it));
for (size_t i = 0; i < num_generators; ++i) {
if (generator_enabled[i]) {
flatbuffers::EnsureDirExists(output_path);
opts.lang = generators[i].lang;
if (!generators[i].generate(parser, output_path, filebase, opts)) {
Error((std::string("Unable to generate ") +
generators[i].name +
" for " +
filebase).c_str());
}
}
}
if (proto_mode) GenerateFBS(parser, output_path, filebase, opts);
// We do not want to generate code for the definitions in this file
// in any files coming up next.
parser.MarkGenerated();
}
return 0;
}