| // 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 1 |
| #elif __cplusplus >= 199711L |
| #define HAVE_STD_REGEX 1 |
| #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 { |
| public: |
| Regex() : init_(false) {} |
| |
| ~Regex(); |
| |
| // Compile a regular expression matcher from spec. Returns true on success. |
| // |
| // On failure (and if error is not nullptr), error is populated with a human |
| // readable error message if an error occurs. |
| bool Init(const std::string& spec, std::string* error); |
| |
| // Returns whether str matches the compiled regular expression. |
| bool Match(const std::string& str); |
| |
| private: |
| bool init_; |
| // Underlying regular expression object |
| #if defined(HAVE_STD_REGEX) |
| std::regex re_; |
| #elif defined(HAVE_POSIX_REGEX) || defined(HAVE_GNU_POSIX_REGEX) |
| regex_t re_; |
| #else |
| #error No regular expression backend implementation available |
| #endif |
| }; |
| |
| #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) { |
| int ec = regcomp(&re_, spec.c_str(), REG_EXTENDED | REG_NOSUB); |
| if (ec != 0) { |
| if (error) { |
| size_t needed = regerror(ec, &re_, nullptr, 0); |
| char* errbuf = new char[needed]; |
| regerror(ec, &re_, errbuf, needed); |
| |
| // regerror returns the number of bytes necessary to null terminate |
| // the string, so we move that when assigning to error. |
| BM_CHECK_NE(needed, 0); |
| error->assign(errbuf, needed - 1); |
| |
| delete[] errbuf; |
| } |
| |
| return false; |
| } |
| |
| init_ = true; |
| return true; |
| } |
| |
| inline Regex::~Regex() { |
| if (init_) { |
| regfree(&re_); |
| } |
| } |
| |
| inline bool Regex::Match(const std::string& str) { |
| if (!init_) { |
| return false; |
| } |
| return regexec(&re_, str.c_str(), 0, nullptr, 0) == 0; |
| } |
| #endif |
| |
| } // end namespace benchmark |
| |
| #endif // BENCHMARK_RE_H_ |