exercism/csharp/logs-logs-logs

Logs, Logs, Logs!

Welcome to Logs, Logs, Logs! on Exercism's C# Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

The C# enum type represents a fixed set of named constants (an enumeration). Its chief purpose is to provide a type-safe way of interacting with numeric constants, limiting the available values to a pre-defined set. A simple enum can be defined as follows:

enum Season
{
    Spring,
    Summer,
    Autumn,
    Winter
}

If not defined explicitly, enum members will automatically get assigned incrementing integer values, with the first value being zero. It is also possible to assign values explicitly:

enum Answer
{
    Maybe = 1,
    Yes = 3,
    No = 5
}

Instructions

In this exercise you'll be processing log-lines.

Each log line is a string formatted as follows: "[<LVL>]: <MESSAGE>".

These are the different log levels:

• TRC (trace)
• DBG (debug)
• INF (info)
• WRN (warning)
• ERR (error)
• FTL (fatal)

You have three tasks.

1. Parse log level

Define a LogLevel enum that has six elements corresponding to the above log levels.

• Trace
• Debug
• Info
• Warning
• Error
• Fatal

Next, implement the (static) LogLine.ParseLogLevel() method to parse the log level of a log line:

LogLine.ParseLogLevel("[INF]: File deleted")
// => LogLevel.Info

2. Support unknown log level

Unfortunately, occasionally some log lines have an unknown log level. To gracefully handle these log lines, add an Unknown element to the LogLevel enum which should be returned when parsing an unknown log level:

LogLine.ParseLogLevel("[XYZ]: Overly specific, out of context message")
// => LogLevel.Unknown

3. Convert log line to short format

The log level of a log line is quite verbose. To reduce the disk space needed to store the log lines, a short format is developed: "[<ENCODED_LEVEL>]:<MESSAGE>".

The encoded log level is a simple mapping of a log level to a number:

• Unknown - 0
• Trace - 1
• Debug - 2
• Info - 4
• Warning - 5
• Error - 6
• Fatal - 42

Implement the (static) LogLine.OutputForShortLog() method that can output the shortened log line format:

LogLine.OutputForShortLog(LogLevel.Error, "Stack overflow")
// => "6:Stack overflow"

Source

Created by

• @ErikSchierboom

Contributed to by

• @valentin-p
• @yzAlvin