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/*
* Copyright 2018 Google
*
* 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 FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_PATH_H_
#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_PATH_H_
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
namespace firebase {
namespace firestore {
namespace util {
struct Path {
/**
* Returns the unqualified trailing part of the pathname, e.g. "c" for
* "/a/b/c".
*/
static absl::string_view Basename(absl::string_view pathname);
/**
* Returns the parent directory name, e.g. "/a/b" for "/a/b/c".
*
* Note:
* * Trailing slashes are treated as a separator between an empty path
* segment and the dirname, so Dirname("/a/b/c/") is "/a/b/c".
* * Runs of more than one slash are treated as a single separator, so
* Dirname("/a/b//c") is "/a/b".
* * Paths are not canonicalized, so Dirname("/a//b//c") is "/a//b".
* * Presently only UNIX style paths are supported (but compilation
* intentionally fails on Windows to prompt implementation there).
*/
static absl::string_view Dirname(absl::string_view pathname);
/**
* Returns true if the given `pathname` is an absolute path.
*/
static bool IsAbsolute(absl::string_view pathname);
/**
* Returns the paths separated by path separators.
*
* @param base If base is of type std::string&& the result is moved from this
* value. Otherwise the first argument is copied.
* @param paths The rest of the path segments.
*/
template <typename S1, typename... SA>
static std::string Join(S1&& base, const SA&... paths) {
std::string result{std::forward<S1>(base)};
JoinAppend(&result, paths...);
return result;
}
/**
* Returns the paths separated by path separators.
*/
static std::string Join() {
return {};
}
private:
/**
* Joins the given base path with a suffix. If `path` is relative, appends it
* to the given base path. If `path` is absolute, replaces `base`.
*/
static void JoinAppend(std::string* base, absl::string_view path);
template <typename... S>
static void JoinAppend(std::string* base,
absl::string_view path,
const S&... rest) {
JoinAppend(base, path);
JoinAppend(base, rest...);
}
static void JoinAppend(std::string* base) {
// Recursive base case; nothing to do.
(void)base;
}
};
} // namespace util
} // namespace firestore
} // namespace firebase
#endif // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_PATH_H_
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