// Parses a layout parameter from the given text
private static LayoutParameter ParseParameter(string text)
{
// Initialize the layout parameter with a temporary full name and text
var parm = new LayoutParameter
{
Text = text,
FullName = Regex.Match(text, ParameterNamePattern).ToString()
};
// Figure the contingent flag and strip down the full name to remove the opening bracket and contingent flag
parm.Contingent = parm.FullName[2] == '?';
parm.FullName = parm.Contingent
? parm.FullName.Substring(3)
: parm.FullName.Substring(2);
// Spllit out the full name into its parts
var nameParts = parm.FullName.Split('.');
foreach (var namePart in nameParts)
parm.NameList.Add(namePart);
// Split out and clean up the parameter format
parm.Format = Regex.Match(text, ParameterFormatPattern).ToString();
parm.Format = !String.IsNullOrEmpty(parm.Format)
? parm.Format.Substring(1)
: null;
parm.Format = !String.IsNullOrEmpty(parm.Format) && parm.Format.StartsWith("'") && parm.Format.EndsWith("'")
? parm.Format.Substring(1, parm.Format.Length - 2)
: parm.Format;
parm.Format = !String.IsNullOrEmpty(parm.Format)
? parm.Format.Replace("\\'", "'").Replace("\\\\", "\\")
: parm.Format;
return parm;
}
// Formats special parameters in the log event, such as tags and exceptions
private static string GetSpecialParameter(LayoutParameter parameter, LogEvent logEvent)
{
switch (parameter.FullName)
{
case "Tags":
return logEvent.Tags != null && logEvent.Tags.Count > 0
? String.Join(",", logEvent.Tags.ToArray())
: null;
case "Exception":
return FormatException(logEvent.Exception);
}
return null;
}