static int?InvokeFunction(string name, System.Collections.IList arguments, NodeResolver document)
{
var finalArgs = new List <int?>();
var func = GetFunction(name);
if (func == null)
{
return(null);
}
int paramCount = func.Parameters.Count;
if (func.IsVariadic)
{
paramCount--;
}
if (arguments.Count < paramCount)
{
TrackerErrorLog.LogError("Function " + func.Name + " called with only " + arguments.Count + "arguments.");
}
if (arguments.Count > paramCount && !func.IsVariadic)
{
TrackerErrorLog.LogError("Function " + func.Name + " called with too many arguments.");
}
for (int i = 0; i < arguments.Count; i++)
{
finalArgs.Add(EvaluateArg(arguments[i], document));
}
while (finalArgs.Count < paramCount)
{
finalArgs.Add(null);
}
return(func.Executor(finalArgs));
}
private static int?EvaluateArg(object arg, NodeResolver document)
{
if (arg == null)
{
return(null);
}
if (arg is int?)
{
return((int?)arg);
}
if (arg is int)
{
return((int)arg);
}
if (arg is JToken)
{
if (arg is JObject)
{
var jArg = (JObject)arg;
if (jArg.Count != 1)
{
TrackerErrorLog.LogError("Invalid object. Only one child allowed.");
return(null);
}
string funcName = null;
JToken argList = null;
// It's kind of dumb that you can't just numerically index the properties
foreach (var p in jArg.Properties())
{
funcName = p.Name;
argList = p.Value;
if (!(argList is JArray))
{
TrackerErrorLog.LogError("Function parameters must be passed into an array.");
return(null);
}
if (funcName.Length == 0 || funcName[0] != '@')
{
TrackerErrorLog.LogError("Unexpected object. If this is supposed to be a function, prefix \"" + funcName + "\" with \"@\".");
return(null);
}
funcName = funcName.Substring(1);
}
return(InvokeFunction(funcName, (JArray)argList, document));
}
else
{
var jArg = (JToken)arg;
if (jArg.Type == JTokenType.String)
{
// Document property reference
return((int)document((string)jArg));
}
else if (jArg.Type == JTokenType.Integer)
{
return((int)jArg);
}
}
}
TrackerErrorLog.LogError("Invalid argument type: " + arg.GetType().ToString());
if (arg is int)
{
return((int)arg);
}
return(null);
}