public virtual object Visit(Node node, TData data)
{
IdentifierNode identifierNode = node as IdentifierNode;
if (identifierNode != null)
{
return(VisitIdentifier(identifierNode, data));
}
InvocationNode invocationNode = node as InvocationNode;
if (invocationNode != null)
{
return(VisitInvocationNode(invocationNode, data));
}
NodeList <Node> nodeList = node as NodeList <Node>;
if (nodeList != null)
{
return(VisitNodeList(nodeList, data));
}
LiteralNode literalNode = node as LiteralNode;
if (literalNode != null)
{
return(VisitLiteral(literalNode, data));
}
throw new NotImplementedException();
}
public virtual object VisitInvocationNode(InvocationNode invocationNode, TData data)
{
string functionName = invocationNode.FunctionName.Identifier;
int argumentCount = invocationNode.Arguments.Count;
object[] arguments = new object[argumentCount];
Type[] argumentTypes = new Type[argumentCount];
bool hasNullArguments = false;
for (int i = 0; i < argumentCount; i++)
{
arguments[i] = Visit(invocationNode.Arguments[i], data);
if (arguments[i] == null)
{
hasNullArguments = true;
argumentTypes[i] = typeof(object);
}
else
{
argumentTypes[i] = arguments[i].GetType();
}
}
MethodInfo methodInfo = _evaluationContext.FunctionBinder.Resolve(functionName, argumentTypes);
if (methodInfo == null)
{
//If we have null arguments, we will propagate null without warning.
if (!hasNullArguments)
{
_evaluationContext.Logger?.LogWarning($"Cannot resolve function {functionName} with argument types {string.Join(",", argumentTypes.Select(t => t.Name))}");
}
return(null);
}
else
{
return(methodInfo.Invoke(null, arguments));
}
}