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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_