llvm/third-party/benchmark/src/re.h

// Copyright 2015 Google Inc. All rights reserved.
//
// 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 BENCHMARK_RE_H_
#define BENCHMARK_RE_H_

#include "internal_macros.h"

// clang-format off

#if !defined(HAVE_STD_REGEX) && \
    !defined(HAVE_GNU_POSIX_REGEX) && \
    !defined(HAVE_POSIX_REGEX)
  // No explicit regex selection; detect based on builtin hints.
  #if defined(BENCHMARK_OS_LINUX) || defined(BENCHMARK_OS_APPLE)
    #define HAVE_POSIX_REGEX …
  #elif __cplusplus >= 199711L
    #define HAVE_STD_REGEX …
  #endif
#endif

// Prefer C regex libraries when compiling w/o exceptions so that we can
// correctly report errors.
#if defined(BENCHMARK_HAS_NO_EXCEPTIONS) && \
    defined(HAVE_STD_REGEX) && \
    (defined(HAVE_GNU_POSIX_REGEX) || defined(HAVE_POSIX_REGEX))
  #undef HAVE_STD_REGEX
#endif

#if defined(HAVE_STD_REGEX)
  #include <regex>
#elif defined(HAVE_GNU_POSIX_REGEX)
  #include <gnuregex.h>
#elif defined(HAVE_POSIX_REGEX)
  #include <regex.h>
#else
#error No regular expression backend was found!
#endif

// clang-format on

#include <string>

#include "check.h"

namespace benchmark {

// A wrapper around the POSIX regular expression API that provides automatic
// cleanup
class Regex { … };

#if defined(HAVE_STD_REGEX)

inline bool Regex::Init(const std::string& spec, std::string* error) {
#ifdef BENCHMARK_HAS_NO_EXCEPTIONS
  ((void)error);  // suppress unused warning
#else
  try {
#endif
  re_ = std::regex(spec, std::regex_constants::extended);
  init_ = true;
#ifndef BENCHMARK_HAS_NO_EXCEPTIONS
}
catch (const std::regex_error& e) {
  if (error) {
    *error = e.what();
  }
}
#endif
return init_;
}

inline Regex::~Regex() {}

inline bool Regex::Match(const std::string& str) {
  if (!init_) {
    return false;
  }
  return std::regex_search(str, re_);
}

#else
inline bool Regex::Init(const std::string& spec, std::string* error) { … }

inline Regex::~Regex() { … }

inline bool Regex::Match(const std::string& str) { … }
#endif

}  // end namespace benchmark

#endif  // BENCHMARK_RE_H_