public static ScalarFunction Create(string name, List <ScalarValue> args)
{
MethodInfo method = null;
if (CustomFunctions.TryGetValue(name, out method))
{
ScalarFunction newFunction = new CustomFunction(name, method)
{
Arguments = args
};
return(newFunction);
}
if (mapping.TryGetValue(name, out ConstructorInfo constructor))
{
ScalarFunction newFunction = (ScalarFunction)constructor.Invoke(new object[] { });
newFunction.Name = name;
newFunction.Arguments = args;
return(newFunction);
}
if (GlobalFunctions.KqlFunctions.TryGetValue(name, out var cslFun))
{
return(new UserDefinedFunction
{
Name = name,
Parameters = cslFun.Arguments,
Body = cslFun.Body,
Arguments = args,
});
}
throw new UnknownFunctionException($"Unknown function: '{name}'");
}
public EvaluateOperator(string args)
{
args = args.Replace("evaluate ", string.Empty);
KustoCode query;
lock (parserLock)
{
query = KustoCode.Parse(args);
}
var diagnostics = query.GetSyntaxDiagnostics()
.Select(d => $"({d.Start}..{d.Start + d.Length}): {d.Message}");
if (diagnostics.Any())
{
var errors = string.Join("\n", diagnostics);
throw new QueryParsingException($"Error parsing expression {args}: {errors}");
}
var syntax = query.Syntax.GetDescendants <Statement>()[0];
Expression = syntax.Visit(new ScalarValueConverter()) as ScalarFunction;
}