THUAI6/CAPI/cpp/grpc/include/absl/flags/internal/path_util.h

//
//  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_