public override object VisitFunctionExp([NotNull] NyaParser.FunctionExpContext context)
{
// TODO: Account for different parameters
String name = context.identifier().GetText();
Type[] argTypes;
Type retType;
switch (name)
{
case "sqrt":
argTypes = new[] { typeof(double) };
VisitAndConvertArgs(context, argTypes);
return(CallMethod(typeof(Math), "Sqrt", argTypes, new Type[] { }));
case "log":
argTypes = new[] { typeof(double) };
VisitAndConvertArgs(context, argTypes);
return(CallMethod(typeof(Math), "Log10", argTypes, new Type[] { }));
case "print":
argTypes = new[] { typeof(string) };
VisitAndConvertArgs(context, argTypes);
return(CallMethod(typeof(Console), "WriteLine", argTypes, new Type[] { }));
}
Type callingType;
bool isThisCall = methodTypeStack.Count == 0;
if (isThisCall)
{
callingType = _currTypeBuilder;
_ilg.Emit(OpCodes.Ldarg_0);
}
else
{
callingType = methodTypeStack.Peek();
}
argTypes = VisitMethodArgs(context.arguments());
bool wasStatic;
retType = CallMethod(callingType, name, argTypes, new Type[] { }, out wasStatic);
if (wasStatic && isThisCall)
{
// I hope this works
_ilg.Emit(OpCodes.Pop);
}
return(retType);
}
private void VisitAndConvertArgs(NyaParser.FunctionExpContext context, Type[] argTypes)
{
if (context.arguments() == null)
{
return;
}
var args = context.arguments().children.OfType <NyaParser.ArgumentContext>().ToList();
for (int i = 0; i < args.Count; i++)
{
Type t = (Type)Visit(args[i]);
if (t != argTypes[i])
{
TypeHelper.TryConvert(_ilg, t, argTypes[i]);
}
}
}