Method parseFromFormat

src/thundersvm/util/log.cpp:1408–1456

@brief Updates format to be used while logging. @param userFormat User provided format

/// @brief Updates format to be used while logging.
/// @param userFormat User provided format
        void LogFormat::parseFromFormat(const base::type::string_t& userFormat) {
            // We make copy because we will be changing the format
            // i.e, removing user provided date format from original format
            // and then storing it.
            base::type::string_t formatCopy = userFormat;
            m_flags = 0x0;
            auto conditionalAddFlag = [&](const base::type::char_t* specifier, base::FormatFlags flag) {
                std::size_t foundAt = base::type::string_t::npos;
                while ((foundAt = formatCopy.find(specifier, foundAt + 1)) != base::type::string_t::npos) {
                    if (foundAt > 0 && formatCopy[foundAt - 1] == base::consts::kFormatSpecifierChar) {
                        if (hasFlag(flag)) {
                            // If we already have flag we remove the escape chars so that '%%' is turned to '%'
                            // even after specifier resolution - this is because we only replaceFirst specifier
                            formatCopy.erase(foundAt > 0 ? foundAt - 1 : 0, 1);
                            ++foundAt;
                        }
                    } else {
                        if (!hasFlag(flag)) addFlag(flag);
                    }
                }
            };
            conditionalAddFlag(base::consts::kAppNameFormatSpecifier, base::FormatFlags::AppName);
            conditionalAddFlag(base::consts::kSeverityLevelFormatSpecifier, base::FormatFlags::Level);
            conditionalAddFlag(base::consts::kSeverityLevelShortFormatSpecifier, base::FormatFlags::LevelShort);
            conditionalAddFlag(base::consts::kLoggerIdFormatSpecifier, base::FormatFlags::LoggerId);
            conditionalAddFlag(base::consts::kThreadIdFormatSpecifier, base::FormatFlags::ThreadId);
            conditionalAddFlag(base::consts::kLogFileFormatSpecifier, base::FormatFlags::File);
            conditionalAddFlag(base::consts::kLogFileBaseFormatSpecifier, base::FormatFlags::FileBase);
            conditionalAddFlag(base::consts::kLogLineFormatSpecifier, base::FormatFlags::Line);
            conditionalAddFlag(base::consts::kLogLocationFormatSpecifier, base::FormatFlags::Location);
            conditionalAddFlag(base::consts::kLogFunctionFormatSpecifier, base::FormatFlags::Function);
            conditionalAddFlag(base::consts::kCurrentUserFormatSpecifier, base::FormatFlags::User);
            conditionalAddFlag(base::consts::kCurrentHostFormatSpecifier, base::FormatFlags::Host);
            conditionalAddFlag(base::consts::kMessageFormatSpecifier, base::FormatFlags::LogMessage);
            conditionalAddFlag(base::consts::kVerboseLevelFormatSpecifier, base::FormatFlags::VerboseLevel);
            // For date/time we need to extract user's date format first
            std::size_t dateIndex = std::string::npos;
            if ((dateIndex = formatCopy.find(base::consts::kDateTimeFormatSpecifier)) != std::string::npos) {
                while (dateIndex > 0 && formatCopy[dateIndex - 1] == base::consts::kFormatSpecifierChar) {
                    dateIndex = formatCopy.find(base::consts::kDateTimeFormatSpecifier, dateIndex + 1);
                }
                if (dateIndex != std::string::npos) {
                    addFlag(base::FormatFlags::DateTime);
                    updateDateFormat(dateIndex, formatCopy);
                }
            }
            m_format = formatCopy;
            updateFormatSpec();
        }

        void LogFormat::updateDateFormat(std::size_t index, base::type::string_t& currFormat) {
            if (hasFlag(base::FormatFlags::DateTime)) {