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- /*
- * Copyright 2017-present Facebook, Inc.
- *
- * 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.
- */
- #include <folly/logging/LogLevel.h>
- #include <array>
- #include <cctype>
- #include <ostream>
- #include <folly/Conv.h>
- using std::string;
- namespace folly {
- namespace {
- struct NumberedLevelInfo {
- LogLevel min;
- LogLevel max;
- StringPiece lowerPrefix;
- StringPiece upperPrefix;
- };
- constexpr std::array<NumberedLevelInfo, 2> numberedLogLevels = {{
- NumberedLevelInfo{LogLevel::DBG, LogLevel::DBG0, "dbg", "DBG"},
- NumberedLevelInfo{LogLevel::INFO, LogLevel::INFO0, "info", "INFO"},
- }};
- } // namespace
- LogLevel stringToLogLevel(StringPiece name) {
- string lowerNameStr;
- lowerNameStr.reserve(name.size());
- for (char c : name) {
- lowerNameStr.push_back(static_cast<char>(std::tolower(c)));
- }
- StringPiece lowerName{lowerNameStr};
- // If the string is of the form "LogLevel::foo" or "LogLevel(foo)"
- // strip it down just to "foo". This makes sure we can process both
- // the "LogLevel::WARN" and "LogLevel(1234)" formats produced by
- // logLevelToString().
- constexpr StringPiece lowercasePrefix{"loglevel::"};
- constexpr StringPiece wrapperPrefix{"loglevel("};
- if (lowerName.startsWith(lowercasePrefix)) {
- lowerName.advance(lowercasePrefix.size());
- } else if (lowerName.startsWith(wrapperPrefix) && lowerName.endsWith(")")) {
- lowerName.advance(wrapperPrefix.size());
- lowerName.subtract(1);
- }
- if (lowerName == "uninitialized") {
- return LogLevel::UNINITIALIZED;
- } else if (lowerName == "none") {
- return LogLevel::NONE;
- } else if (lowerName == "debug" || lowerName == "dbg") {
- return LogLevel::DBG;
- } else if (lowerName == "info") {
- return LogLevel::INFO;
- } else if (lowerName == "warn" || lowerName == "warning") {
- return LogLevel::WARN;
- } else if (lowerName == "error" || lowerName == "err") {
- return LogLevel::ERR;
- } else if (lowerName == "critical") {
- return LogLevel::CRITICAL;
- } else if (lowerName == "dfatal") {
- return LogLevel::DFATAL;
- } else if (lowerName == "fatal") {
- return LogLevel::FATAL;
- } else if (lowerName == "max" || lowerName == "max_level") {
- return LogLevel::MAX_LEVEL;
- }
- for (const auto& info : numberedLogLevels) {
- if (!lowerName.startsWith(info.lowerPrefix)) {
- continue;
- }
- auto remainder = lowerName.subpiece(info.lowerPrefix.size());
- auto level = folly::tryTo<int>(remainder).value_or(-1);
- if (level < 0 ||
- static_cast<unsigned int>(level) > (static_cast<uint32_t>(info.max) -
- static_cast<uint32_t>(info.min))) {
- throw std::range_error(to<string>(
- "invalid ", info.lowerPrefix, " logger level: ", name.str()));
- }
- return info.max - level;
- }
- // Try as an plain integer if all else fails
- try {
- auto level = folly::to<uint32_t>(lowerName);
- return static_cast<LogLevel>(level);
- } catch (const std::exception&) {
- throw std::range_error("invalid logger level: " + name.str());
- }
- }
- string logLevelToString(LogLevel level) {
- if (level == LogLevel::UNINITIALIZED) {
- return "UNINITIALIZED";
- } else if (level == LogLevel::NONE) {
- return "NONE";
- } else if (level == LogLevel::DBG) {
- return "DEBUG";
- } else if (level == LogLevel::INFO) {
- return "INFO";
- } else if (level == LogLevel::WARN) {
- return "WARN";
- } else if (level == LogLevel::ERR) {
- return "ERR";
- } else if (level == LogLevel::CRITICAL) {
- return "CRITICAL";
- } else if (level == LogLevel::DFATAL) {
- return "DFATAL";
- } else if (level == LogLevel::FATAL) {
- return "FATAL";
- }
- for (const auto& info : numberedLogLevels) {
- if (static_cast<uint32_t>(level) <= static_cast<uint32_t>(info.max) &&
- static_cast<uint32_t>(level) > static_cast<uint32_t>(info.min)) {
- auto num = static_cast<uint32_t>(info.max) - static_cast<uint32_t>(level);
- return folly::to<string>(info.upperPrefix, num);
- }
- }
- return folly::to<string>("LogLevel(", static_cast<uint32_t>(level), ")");
- }
- std::ostream& operator<<(std::ostream& os, LogLevel level) {
- os << logLevelToString(level);
- return os;
- }
- } // namespace folly
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