metadata/parser.cpp

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * 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 <fstream>
#include <iostream>

#include <json/json.h>

int main(int argc, char** argv) {
    if (argc != 2) {
        std::cerr << "Usage: hidl_metadata_parser *.json" << std::endl;
        return EXIT_FAILURE;
    }
    const std::string path = argv[1];

    Json::Value root;
    Json::Reader reader;

    std::ifstream stream(path);
    if (!reader.parse(stream, root)) {
        std::cerr << "Failed to read interface inheritance hierarchy file: " << path << std::endl
                  << reader.getFormattedErrorMessages() << std::endl;
        return EXIT_FAILURE;
    }

    std::cout << "#include <hidl/metadata.h>" << std::endl;
    std::cout << "namespace android {" << std::endl;
    std::cout << "std::vector<HidlInterfaceMetadata> HidlInterfaceMetadata::all() {" << std::endl;
    std::cout << "return std::vector<HidlInterfaceMetadata>{" << std::endl;
    for (const Json::Value& entry : root) {
        std::cout << "HidlInterfaceMetadata{" << std::endl;
        // HIDL interface characters guaranteed to be accepted in C++ string
        std::cout << "std::string(\"" << entry["interface"].asString() << "\")," << std::endl;
        std::cout << "std::vector<std::string>{" << std::endl;
        for (const Json::Value& intf : entry["inheritedInterfaces"]) {
            std::cout << "std::string(\"" << intf.asString() << "\")," << std::endl;
        }
        std::cout << "}," << std::endl;
        std::cout << "}," << std::endl;
    }
    std::cout << "};" << std::endl;
    std::cout << "}" << std::endl;
    std::cout << "}  // namespace android" << std::endl;
    return EXIT_SUCCESS;
}