// Copyright 2018 Google LLC

//

// 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 CC_FILE_PATH_H_

#define CC_FILE_PATH_H_

#include <initializer_list>

#include <string>

#include <utility>

#include "absl/strings/string_view.h"

namespace minigo {

namespace file {

// Platform-specific file path separator character.

extern const char kSepChar;

// Platform-specific file path separator as a string.

extern const char kSepStr[2];

namespace internal {

std::string JoinPathImpl(std::initializer_list<absl::string_view> paths);

} // namespace internal

// Joins the given arguments into a file path.

// The caller is responsible for normalizing slashes.

template <typename... T>

inline std::string JoinPath(const T&... args) {

return internal::JoinPathImpl({args...});

}

// Splits the path into directory and basename parts.

// On Windows both forward and bask slashes are treated as valid separators.

// On OSX and Linux, only forward slash is treated as a valid separator.

std::pair<absl::string_view, absl::string_view> SplitPath(

absl::string_view path);

// Splits the path using SplitPath, then returns just the directory part.

inline absl::string_view Dirname(absl::string_view path) {

return SplitPath(path).first;

}

// Splits the path using SplitPath, then returns just the basename part.

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

return SplitPath(path).second;

}

inline absl::string_view Stem(absl::string_view path) {

auto base = Basename(path);

auto pos = base.find_last_of('.');

if (pos == absl::string_view::npos) {

return base;

}

return base.substr(0, pos);

}

// Normalizes the slashes in the given path.

// On Windows, all forward slashes are replaced with back slashes unless the

// path begins with the string "gs://", in which case back slashes are replaced

// with forward slashes.

// On OSX and Linux, all back slashes are replaced with forward slashes.

std::string NormalizeSlashes(std::string path);

} // namespace file

} // namespace minigo

#endif // CC_FILE_PATH_H_