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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);
namespace flatbuffers {
bool GenerateBinary(const Parser &parser,
const std::string &path,
const std::string &file_name,
const GeneratorOptions & /*opts*/) {
return !parser.builder_.GetSize() ||
flatbuffers::SaveFile(
(path + file_name + ".bin").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 *extension;
const char *name;
const char *help;
};
const Generator generators[] = {
{ flatbuffers::GenerateBinary, "b", "binary",
"Generate wire format binaries for any data definitions" },
{ flatbuffers::GenerateTextFile, "t", "text",
"Generate text output for any data definitions" },
{ flatbuffers::GenerateCPP, "c", "C++",
"Generate C++ headers for tables/structs" },
{ flatbuffers::GenerateJava, "j", "Java",
"Generate Java classes for tables/structs" },
};
const char *program_name = NULL;
static void Error(const char *err, const char *obj, bool usage) {
printf("%s: %s", program_name, 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].extension, generators[i].help);
printf(" -o PATH Prefix PATH to all generated files.\n"
" -S Strict JSON: add quotes to field names.\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);
}
std::string StripExtension(const std::string &filename) {
size_t i = filename.find_last_of(".");
return i != std::string::npos ? filename.substr(0, i) : filename;
}
std::string StripPath(const std::string &filename) {
size_t i = filename.find_last_of(
#ifdef WIN32
"\\:"
#else
"/"
#endif
);
return i != std::string::npos ? filename.substr(i + 1) : filename;
}
int main(int argc, const char *argv[]) {
program_name = argv[0];
flatbuffers::Parser parser;
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;
std::vector<std::string> filenames;
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);
if (strlen(arg) != 2)
Error("invalid commandline argument", arg, true);
switch (arg[1]) {
case 'o':
if (++i >= argc) Error("missing path following", arg, true);
output_path = argv[i];
break;
case 'S':
opts.strict_json = true;
break;
case '-': // Separator between text and binary input files.
binary_files_from = filenames.size();
break;
default:
for (size_t i = 0; i < num_generators; ++i) {
if(!strcmp(arg+1, generators[i].extension)) {
generator_enabled[i] = true;
any_generator = true;
goto found;
}
}
Error("unknown commandline argument", arg, true);
found:
break;
}
} 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 -j -t -b etc.", true);
// Now process the files:
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 {
if (!parser.Parse(contents.c_str()))
Error(parser.error_.c_str());
}
std::string filebase = StripPath(StripExtension(*file_it));
for (size_t i = 0; i < num_generators; ++i) {
if (generator_enabled[i]) {
if (!generators[i].generate(parser, output_path, filebase, opts)) {
Error((std::string("Unable to generate ") +
generators[i].name +
" for " +
filebase).c_str());
}
}
}
// Since the Parser object retains definitions across files, we must
// ensure we only output code for these once, in the file they are first
// declared:
for (auto it = parser.enums_.vec.begin();
it != parser.enums_.vec.end(); ++it) {
(*it)->generated = true;
}
for (auto it = parser.structs_.vec.begin();
it != parser.structs_.vec.end(); ++it) {
(*it)->generated = true;
}
}
return 0;
}
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