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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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.
#ifndef INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_JSONFS_HPP
#define INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_JSONFS_HPP
#include <exception>
#include <filesystem>
#include <fstream>
#include <optional>
#include "src/buildtool/file_system/file_system_manager.hpp"
#include "src/buildtool/file_system/object_type.hpp"
#include "src/utils/cpp/json.hpp"
class Json {
public:
// Note that we are not using std::pair<std::nlohmann, bool> and being
// coherent with FileSystemManager::ReadFile because there is a bug in llvm
// toolchain related to type_traits that does not allow us to use
// std::pair<T,U> where T or U are nlohmann::json.
// LLVM bug report: https://bugs.llvm.org/show_bug.cgi?id=48507
// Minimal example: https://godbolt.org/z/zacedsGzo
[[nodiscard]] static auto ReadFile(
std::filesystem::path const& file) noexcept
-> std::optional<nlohmann::json> {
auto const type = FileSystemManager::Type(file);
if (not type or not IsFileObject(*type)) {
Logger::Log(LogLevel::Debug,
"{} can not be read because it is not a file.",
file.string());
return std::nullopt;
}
try {
nlohmann::json content;
std::ifstream file_reader(file.string());
if (file_reader.is_open()) {
file_reader >> content;
return content;
}
return std::nullopt;
} catch (std::exception const& e) {
Logger::Log(LogLevel::Error, e.what());
return std::nullopt;
}
}
}; // Class Json
#endif // INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_JSONFS_HPP
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