140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef BENCHMARK_RE_H_
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#define BENCHMARK_RE_H_
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#include "internal_macros.h"
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// Prefer C regex libraries when compiling w/o exceptions so that we can
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// correctly report errors.
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#if defined(BENCHMARK_HAS_NO_EXCEPTIONS) && defined(HAVE_STD_REGEX) && \
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(defined(HAVE_GNU_POSIX_REGEX) || defined(HAVE_POSIX_REGEX))
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#undef HAVE_STD_REGEX
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#endif
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#if defined(HAVE_STD_REGEX)
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#include <regex>
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#elif defined(HAVE_GNU_POSIX_REGEX)
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#include <gnuregex.h>
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#elif defined(HAVE_POSIX_REGEX)
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#include <regex.h>
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#else
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#error No regular expression backend was found!
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#endif
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#include <string>
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#include "check.h"
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namespace benchmark {
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// A wrapper around the POSIX regular expression API that provides automatic
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// cleanup
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class Regex {
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public:
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Regex() : init_(false) {}
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~Regex();
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// Compile a regular expression matcher from spec. Returns true on success.
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//
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// On failure (and if error is not nullptr), error is populated with a human
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// readable error message if an error occurs.
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bool Init(const std::string& spec, std::string* error);
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// Returns whether str matches the compiled regular expression.
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bool Match(const std::string& str);
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private:
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bool init_;
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// Underlying regular expression object
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#if defined(HAVE_STD_REGEX)
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std::regex re_;
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#elif defined(HAVE_POSIX_REGEX) || defined(HAVE_GNU_POSIX_REGEX)
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regex_t re_;
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#else
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#error No regular expression backend implementation available
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#endif
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};
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#if defined(HAVE_STD_REGEX)
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inline bool Regex::Init(const std::string& spec, std::string* error) {
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#ifdef BENCHMARK_HAS_NO_EXCEPTIONS
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((void)error); // suppress unused warning
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#else
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try {
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#endif
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re_ = std::regex(spec, std::regex_constants::extended);
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init_ = true;
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#ifndef BENCHMARK_HAS_NO_EXCEPTIONS
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} catch (const std::regex_error& e) {
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if (error) {
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*error = e.what();
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}
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}
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#endif
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return init_;
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}
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inline Regex::~Regex() {}
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inline bool Regex::Match(const std::string& str) {
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if (!init_) {
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return false;
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}
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return std::regex_search(str, re_);
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}
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#else
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inline bool Regex::Init(const std::string& spec, std::string* error) {
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int ec = regcomp(&re_, spec.c_str(), REG_EXTENDED | REG_NOSUB);
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if (ec != 0) {
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if (error) {
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size_t needed = regerror(ec, &re_, nullptr, 0);
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char* errbuf = new char[needed];
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regerror(ec, &re_, errbuf, needed);
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// regerror returns the number of bytes necessary to null terminate
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// the string, so we move that when assigning to error.
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CHECK_NE(needed, 0);
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error->assign(errbuf, needed - 1);
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delete[] errbuf;
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}
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return false;
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}
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init_ = true;
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return true;
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}
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inline Regex::~Regex() {
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if (init_) {
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regfree(&re_);
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}
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}
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inline bool Regex::Match(const std::string& str) {
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if (!init_) {
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return false;
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}
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return regexec(&re_, str.c_str(), 0, nullptr, 0) == 0;
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}
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#endif
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} // end namespace benchmark
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#endif // BENCHMARK_RE_H_
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