//

//  Copyright 2019 The Abseil Authors.

//

// 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

//

//      https://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 ABSL_FLAGS_INTERNAL_PATH_UTIL_H_

#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_

#include "absl/base/config.h"

#include "absl/strings/string_view.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

namespace flags_internal {

// A portable interface that returns the basename of the filename passed as an

// argument. It is similar to basename(3)

// <https://linux.die.net/man/3/basename>.

// For example:

//     flags_internal::Basename("a/b/prog/file.cc")

// returns "file.cc"

//     flags_internal::Basename("file.cc")

// returns "file.cc"

inline absl::string_view Basename(absl::string_view filename) {

  auto last_slash_pos = filename.find_last_of("/\\");

  return last_slash_pos == absl::string_view::npos

             ? filename

             : filename.substr(last_slash_pos + 1);

}

// A portable interface that returns the directory name of the filename

// passed as an argument, including the trailing slash.

// Returns the empty string if a slash is not found in the input file name.

// For example:

//      flags_internal::Package("a/b/prog/file.cc")

// returns "a/b/prog/"

//      flags_internal::Package("file.cc")

// returns ""

inline absl::string_view Package(absl::string_view filename) {

  auto last_slash_pos = filename.find_last_of("/\\");

  return last_slash_pos == absl::string_view::npos

             ? absl::string_view()

             : filename.substr(0, last_slash_pos + 1);

}

}  // namespace flags_internal

ABSL_NAMESPACE_END

}  // namespace absl

#endif  // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_