public Void Visit_SuperExpr(SuperExpr expr) { if (_currentClass == ClassType.None) { _errors.Add(new Error(expr.keyword, ErrorType.InvalidUseOfSuper, "Cannot use 'super' outside of a class.")); } else if (_currentClass != ClassType.Subclass) { _errors.Add(new Error(expr.keyword, ErrorType.InvalidUseOfSuper, "Cannot use 'super' in a class wihtout superclass.")); } ResolveLocal(expr, expr.keyword); return(null); }
public object VisitSuperExpr(SuperExpr expr) { if (_currentClassType == ClassType.NONE) { Lox.Error(expr.Keyword, "Cannot use 'super' outside of a class."); } else if (_currentClassType != ClassType.SUBCLASS) { Lox.Error(expr.Keyword, "Cannot use 'super' in a class with no super class."); } ResolveLocal(expr, expr.Keyword); return(null); }
public object VisitSuperExpr(SuperExpr expr) { int distance = _locals[expr]; var superClass = _scope.GetAt(distance, "super") as LoxClass; // "this" is always one level closer than "super"'s scope. var obj = _scope.GetAt(distance - 1, "this") as LoxInstance; var method = superClass.FindMethod(obj, expr.Method.Lexeme); if (method == null) { throw new LoxRuntimeException(expr.Method, $"Undefined property '{expr.Method.Lexeme}'."); } return(method); }
public Object Visit_SuperExpr(SuperExpr expr) { int distance = _locals[expr]; LoxClass superclass = (LoxClass)_environment.GetAt(distance, "super"); // "this" is always one level nearer than "super"'s environment. LoxInstance obj = (LoxInstance)_environment.GetAt(distance - 1, "this"); string name = (string)expr.method.value; LoxFunction method = superclass.FindMethod(name); if (method == null) { throw new RuntimeException(expr.method.line, expr.method.column, "Undefined property '" + name + "'."); } return(method.Bind(obj)); }
public string Visit_SuperExpr(SuperExpr expr) { return("super"); }