private static LayoutRenderer ParseLayoutRenderer(Tokenizer sr)
{
int ch;
ch = sr.Read();
if (ch != '{')
throw new LogConfigurationException("'{' expected in layout specification");
string name = ParseLayoutRendererName(sr);
LayoutRenderer lr = LayoutRendererFactory.CreateLayoutRenderer(name, null);
ch = sr.Read();
while (ch != -1 && ch != '}')
{
string parameterName = ParseParameterName(sr).Trim();
if (sr.Peek() == '=')
{
sr.Read(); // skip the '='
PropertyInfo pi = PropertyHelper.GetPropertyInfo(lr, parameterName);
if (pi == null)
{
ParseParameterValue(sr);
}
else
{
if (typeof(Layout) == pi.PropertyType)
{
Layout nestedLayout = new Layout();
string txt;
LayoutRenderer[] renderers = CompileLayout(sr, true, out txt);
nestedLayout.SetRenderers(renderers, txt);
pi.SetValue(lr, nestedLayout, null);
}
else
{
string value = ParseParameterValue(sr);
PropertyHelper.SetPropertyFromString(lr, parameterName, value, null);
}
}
}
else
{
// what we've just read is not a parameterName, but a value
// assign it to a default property (denoted by empty string)
PropertyInfo pi = PropertyHelper.GetPropertyInfo(lr, "");
if (pi != null)
{
if (typeof(Layout) == pi.PropertyType)
{
pi.SetValue(lr, new Layout(parameterName), null);
}
else
{
string value = parameterName;
PropertyHelper.SetPropertyFromString(lr, pi.Name, value, null);
}
}
else
{
InternalLogger.Warn("{0} has no default property", lr.GetType().FullName);
}
}
ch = sr.Read();
}
return lr;
}
/// <summary>
/// Evaluates the specified text by expadinging all layout renderers.
/// </summary>
/// <param name="text">The text to be evaluated.</param>
/// <param name="logEvent">Log event to be used for evaluation</param>
/// <returns>The input text with all occurences of ${} replaced with
/// values provided by the appropriate layout renderers.</returns>
public static string Evaluate(string text, LogEventInfo logEvent)
{
Layout l = new Layout(text);
return l.GetFormattedMessage(logEvent);
}