//===- ExpandResponseFileCompilationDataBase.cpp --------------------------===//

//

// 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/Tooling/CompilationDatabase.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/ADT/Triple.h"

#include "llvm/Support/CommandLine.h"

#include "llvm/Support/ConvertUTF.h"

#include "llvm/Support/ErrorOr.h"

#include "llvm/Support/Host.h"

#include "llvm/Support/MemoryBuffer.h"

#include "llvm/Support/Path.h"

#include "llvm/Support/StringSaver.h"

namespace clang {

namespace tooling {

namespace {

class ExpandResponseFilesDatabase : public CompilationDatabase {

public:

  ExpandResponseFilesDatabase(

      std::unique_ptr<CompilationDatabase> Base,

      llvm::cl::TokenizerCallback Tokenizer,

      llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS)

      : Base(std::move(Base)), Tokenizer(Tokenizer), FS(std::move(FS)) {

    assert(this->Base != nullptr);

    assert(this->Tokenizer != nullptr);

    assert(this->FS != nullptr);

  }

  std::vector<std::string> getAllFiles() const override {

    return Base->getAllFiles();

  }

  std::vector<CompileCommand>

  getCompileCommands(StringRef FilePath) const override {

    return expand(Base->getCompileCommands(FilePath));

  }

  std::vector<CompileCommand> getAllCompileCommands() const override {

    return expand(Base->getAllCompileCommands());

  }

private:

  std::vector<CompileCommand> expand(std::vector<CompileCommand> Cmds) const {

    for (auto &Cmd : Cmds) {

      bool SeenRSPFile = false;

      llvm::SmallVector<const char *, 20> Argv;

      Argv.reserve(Cmd.CommandLine.size());

      for (auto &Arg : Cmd.CommandLine) {

        Argv.push_back(Arg.c_str());

        if (!Arg.empty())

          SeenRSPFile |= Arg.front() == '@';

      }

      if (!SeenRSPFile)

        continue;

      llvm::BumpPtrAllocator Alloc;

      llvm::StringSaver Saver(Alloc);

      llvm::cl::ExpandResponseFiles(Saver, Tokenizer, Argv, false, false,

                                    llvm::StringRef(Cmd.Directory), *FS);

      // Don't assign directly, Argv aliases CommandLine.

      std::vector<std::string> ExpandedArgv(Argv.begin(), Argv.end());

      Cmd.CommandLine = std::move(ExpandedArgv);

    }

    return Cmds;

  }

private:

  std::unique_ptr<CompilationDatabase> Base;

  llvm::cl::TokenizerCallback Tokenizer;

  llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS;

};

} // namespace

std::unique_ptr<CompilationDatabase>

expandResponseFiles(std::unique_ptr<CompilationDatabase> Base,

                    llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS) {

  auto Tokenizer = llvm::Triple(llvm::sys::getProcessTriple()).isOSWindows()

                       ? 
llvm::cl::TokenizeWindowsCommandLine0

                       : llvm::cl::TokenizeGNUCommandLine;

  return std::make_unique<ExpandResponseFilesDatabase>(

      std::move(Base), Tokenizer, std::move(FS));

}

} // namespace tooling

} // namespace clang