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The new logger interface provides a single function, `logln`, which can be implemented by the users of the API. The interface has a default implementation, `StdErrLogger`, which logs the data to `stderr` if the level is higher than `LogLevel::INFO`. `LogLevel::ALWAYS` is always logged without a prefix to match the existing behavior.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| #pragma once | ||
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| #include <cstdio> | ||
| #include <cstdarg> | ||
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| // Since this file is most likely to be used outside of the project (like, in Android), | ||
| // using a namespace to avoid conflicts | ||
| namespace wfb { | ||
| enum class LogLevel { | ||
| ALWAYS, | ||
| ERROR, | ||
| WARNING, | ||
| INFO, | ||
| DEBUG | ||
| }; | ||
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| class Logger | ||
| { | ||
| public: | ||
| virtual ~Logger() = default; | ||
| virtual void logln(LogLevel level, const char* format, ...) = 0; | ||
| // logs unconditionally disregarding the log level | ||
| // virtual void logln(const char* format, ...) = 0; | ||
| }; | ||
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| class StdErrLogger : public Logger | ||
| { | ||
| public: | ||
| void logln(LogLevel level, const char* format, ...) override { | ||
| const char* level_str = ""; | ||
| switch (level) { | ||
| case LogLevel::DEBUG: | ||
| case LogLevel::INFO: | ||
| return; | ||
| case LogLevel::ALWAYS: | ||
| level_str = ""; | ||
| break; | ||
| case LogLevel::WARNING: | ||
| level_str = "WARNING: "; | ||
| break; | ||
| case LogLevel::ERROR: | ||
| level_str = "ERROR: "; | ||
| break; | ||
| } | ||
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| char buffer[1024]; | ||
| va_list args; | ||
| va_start(args, format); | ||
| int prefix_len = snprintf(buffer, sizeof(buffer), "%s", level_str); | ||
| int message_len = vsnprintf(buffer + prefix_len, sizeof(buffer) - prefix_len - 2, format, args); | ||
| va_end(args); | ||
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| buffer[prefix_len + message_len] = '\n'; | ||
| buffer[prefix_len + message_len + 1] = '\0'; | ||
| } | ||
| }; | ||
| } // namespace wfb |
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