public object Visit(Expr.Assign expr) { object value = Evaluate(expr.value); int?distance = _locals.Get(expr); if (distance != null) { _environment.AssignAt(distance.Value, expr.Name, value); } else { _globals.Assign(expr.Name, value); } return(value); }
public object Visit(Stmt.Class stmt) { _environment.Define(stmt.Name.Lexeme, null); // Superclass object superclass = null; if (stmt.Superclass != null) { superclass = Evaluate(stmt.Superclass); if (!(superclass is LoxClass)) { throw new RuntimeErrorException(stmt.Superclass.Name, "Superclass must be a class."); } _environment = new LoxEnvironment(_environment); _environment.Define("super", superclass); } // Methods HashMap <string, LoxFunction> methods = new HashMap <string, LoxFunction>(); foreach (Stmt.Function method in stmt.Methods) { LoxFunction function = new LoxFunction(method, _environment, method.Name.Lexeme.Equals("init")); methods.Put(method.Name.Lexeme, function); } LoxClass @class = new LoxClass(stmt.Name.Lexeme, (LoxClass)superclass, methods); if (superclass != null) { _environment = _environment.Enclosing; } _environment.Assign(stmt.Name, @class); return(null); }