private MatchDelegate CreateMatchDelegate(string rule)
{
if (rule.ToLower() == "$host")
{
return((logFileName, match) => Environment.MachineName);
}
if (rule.ToLower() == "$datetime")
{
return((logFileName, match) => DateTime.Now.ToString(CultureInfo.InvariantCulture));
}
int elemenNumgerInPath;
if (rule.ToLower().StartsWith("$path:") && Int32.TryParse(rule.Split(':').ElementAtOrDefault(1), out elemenNumgerInPath))
{
return
((logFileName, match) => logFileName.Split('/', '\\').ElementAtOrDefault(elemenNumgerInPath));
}
if (rule.ToLower() == "$rate")
{
if (RegexRule.GroupNumberFromName("timespan") > 0 && RegexRule.GroupNumberFromName("value") > 0)
{
return
(logFileName, match) =>
{
double value;
TimeSpan timeSpan;
if (Double.TryParse(match.Groups["value"].Value, out value))
{
if (TimeSpan.TryParse(match.Groups["timespan"].Value, out timeSpan))
{
if (timeSpan != TimeSpan.Zero)
{
return (value / timeSpan.TotalMilliseconds).ToString("F");
}
}
}
return "0";
}
}
;
}
if (rule.ToLower().StartsWith("$replace:"))
{
return((logFileName, match) => match.Result(rule.Split(new[] { ':' }, 2)[1]));
}
string regexGroupName = rule.Trim(new[] { '{', '}' });
if (rule.StartsWith("{") && rule.EndsWith("}") && RegexRule.GroupNumberFromName(regexGroupName) >= 0)
{
return((logFileName, match) => match.Groups[regexGroupName].Value);
}
return((logFileName, match) => rule);
}
