// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#ifndef CARBON_TOOLCHAIN_DRIVER_DRIVER_H_
#define CARBON_TOOLCHAIN_DRIVER_DRIVER_H_

#include "common/command_line.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "toolchain/driver/driver_env.h"
#include "toolchain/driver/driver_subcommand.h"

namespace Carbon {

// Command line interface driver.
//
// Provides simple API to parse and run command lines for Carbon.  It is
// generally expected to be used to implement command line tools for working
// with the language.
class Driver {
 public:
  // Constructs a driver with the provided environment. `input_stream` is
  // optional; other parameters are required.
  explicit Driver(llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
                  const InstallPaths* installation, FILE* input_stream,
                  llvm::raw_pwrite_stream* output_stream,
                  llvm::raw_pwrite_stream* error_stream, bool fuzzing = false)
      : driver_env_(std::move(fs), installation, input_stream, output_stream,
                    error_stream, fuzzing) {}

  // Parses the given arguments into both a subcommand to select the operation
  // to perform and any arguments to that subcommand.
  //
  // Returns true if the operation succeeds. If the operation fails, returns
  // false and any information about the failure is printed to the registered
  // error stream (stderr by default).
  auto RunCommand(llvm::ArrayRef<llvm::StringRef> args) -> DriverResult;

 private:
  DriverEnv driver_env_;
};

}  // namespace Carbon

#endif  // CARBON_TOOLCHAIN_DRIVER_DRIVER_H_