public Void VisitBaseExpr(Expr.Base expr)
{
if (currentClass == ClassType.NONE)
{
ElizScriptCompiler.Error(expr.keyword, "Cannot use 'base' outside of a class.");
}
else if (currentClass != ClassType.SUBCLASS)
{
ElizScriptCompiler.Error(expr.keyword, "Cannot use 'base' in a class with no baseclass.");
}
ResolveLocal(expr, expr.keyword);
return(null);
}
public object VisitBaseExpr(Expr.Base expr)
{
int distance = locals[expr];
ElizClass superclass = (ElizClass)environment.GetAt(distance, "base");
// "this" is always one level nearer than "super"'s environment.
ElizInstance @object = (ElizInstance)environment.GetAt(distance - 1, "this");
ElizFunction method = superclass.FindMethod(expr.method.Lexeme);
if (method == null)
{
throw new RuntimeError(expr.method, $"Undefined property '{expr.method.Lexeme}'.");
}
return(method.Bind(@object));
}