//===--- DarwinSDKInfo.cpp - SDK Information parser for darwin - ----------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "clang/Driver/DarwinSDKInfo.h"

#include "llvm/Support/ErrorOr.h"

#include "llvm/Support/JSON.h"

#include "llvm/Support/MemoryBuffer.h"

#include "llvm/Support/Path.h"

using namespace clang::driver;

using namespace clang;

Expected<Optional<DarwinSDKInfo>>

driver::parseDarwinSDKInfo(llvm::vfs::FileSystem &VFS, StringRef SDKRootPath) {

  llvm::SmallString<256> Filepath = SDKRootPath;

  llvm::sys::path::append(Filepath, "SDKSettings.json");

  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =

      VFS.getBufferForFile(Filepath);

  if (!File) {

    // If the file couldn't be read, assume it just doesn't exist.

    return None;

  }

  Expected<llvm::json::Value> Result =

      llvm::json::parse(File.get()->getBuffer());

  if (!Result)

    return Result.takeError();

  if (const auto *Obj = Result->getAsObject()) {

    auto VersionString = Obj->getString("Version");

    if (VersionString) {

      VersionTuple Version;

      if (!Version.tryParse(*VersionString))

        return DarwinSDKInfo(Version);

    }

  }

  return llvm::make_error<llvm::StringError>("invalid SDKSettings.json",

                                             llvm::inconvertibleErrorCode());

}