spdlog/cfg/helpers-inl.h

0001 // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
0002 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
0003
0004 #pragma once
0005
0006 #ifndef SPDLOG_HEADER_ONLY
0007     #include <spdlog/cfg/helpers.h>
0008 #endif
0009
0010 #include <spdlog/details/os.h>
0011 #include <spdlog/details/registry.h>
0012 #include <spdlog/spdlog.h>
0013
0014 #include <algorithm>
0015 #include <sstream>
0016 #include <string>
0017 #include <utility>
0018
0019 namespace spdlog {
0020 namespace cfg {
0021 namespace helpers {
0022
0023 // inplace convert to lowercase
0024 inline std::string &to_lower_(std::string &str) {
0025     std::transform(str.begin(), str.end(), str.begin(), [](char ch) {
0026         return static_cast<char>((ch >= 'A' && ch <= 'Z') ? ch + ('a' - 'A') : ch);
0027     });
0028     return str;
0029 }
0030
0031 // inplace trim spaces
0032 inline std::string &trim_(std::string &str) {
0033     const char *spaces = " \n\r\t";
0034     str.erase(str.find_last_not_of(spaces) + 1);
0035     str.erase(0, str.find_first_not_of(spaces));
0036     return str;
0037 }
0038
0039 // return (name,value) trimmed pair from given "name=value" string.
0040 // return empty string on missing parts
0041 // "key=val" => ("key", "val")
0042 // " key  =  val " => ("key", "val")
0043 // "key=" => ("key", "")
0044 // "val" => ("", "val")
0045
0046 inline std::pair<std::string, std::string> extract_kv_(char sep, const std::string &str) {
0047     auto n = str.find(sep);
0048     std::string k, v;
0049     if (n == std::string::npos) {
0050         v = str;
0051     } else {
0052         k = str.substr(0, n);
0053         v = str.substr(n + 1);
0054     }
0055     return std::make_pair(trim_(k), trim_(v));
0056 }
0057
0058 // return vector of key/value pairs from sequence of "K1=V1,K2=V2,.."
0059 // "a=AAA,b=BBB,c=CCC,.." => {("a","AAA"),("b","BBB"),("c", "CCC"),...}
0060 inline std::unordered_map<std::string, std::string> extract_key_vals_(const std::string &str) {
0061     std::string token;
0062     std::istringstream token_stream(str);
0063     std::unordered_map<std::string, std::string> rv{};
0064     while (std::getline(token_stream, token, ',')) {
0065         if (token.empty()) {
0066             continue;
0067         }
0068         auto kv = extract_kv_('=', token);
0069         rv[kv.first] = kv.second;
0070     }
0071     return rv;
0072 }
0073
0074 SPDLOG_INLINE void load_levels(const std::string &input) {
0075     if (input.empty() || input.size() > 512) {
0076         return;
0077     }
0078
0079     auto key_vals = extract_key_vals_(input);
0080     std::unordered_map<std::string, level::level_enum> levels;
0081     level::level_enum global_level = level::info;
0082     bool global_level_found = false;
0083
0084     for (auto &name_level : key_vals) {
0085         auto &logger_name = name_level.first;
0086         auto level_name = to_lower_(name_level.second);
0087         auto level = level::from_str(level_name);
0088         // ignore unrecognized level names
0089         if (level == level::off && level_name != "off") {
0090             continue;
0091         }
0092         if (logger_name.empty())  // no logger name indicate global level
0093         {
0094             global_level_found = true;
0095             global_level = level;
0096         } else {
0097             levels[logger_name] = level;
0098         }
0099     }
0100
0101     details::registry::instance().set_levels(std::move(levels),
0102                                              global_level_found ? &global_level : nullptr);
0103 }
0104
0105 }  // namespace helpers
0106 }  // namespace cfg
0107 }  // namespace spdlog