public object VisitClassStmt(Stmt.Class stmt) { _environment.Define(stmt.Name.Lexeme, null); object superclass = null; if (stmt.Superclass != null) { superclass = Evaluate(stmt.Superclass); if (!(superclass is LoxClass)) { throw new RuntimeError(stmt.Name, "Superclass must be a class."); } _environment = new EnvironmentScope(_environment); _environment.Define("super", superclass); } var methods = new Dictionary <string, LoxFunction>(); foreach (var method in stmt.Methods) { var function = new LoxFunction(method, _environment, method.Name.Lexeme == "init"); methods[method.Name.Lexeme] = function; } var klass = new LoxClass(stmt.Name.Lexeme, (LoxClass)superclass, methods); if (superclass != null) { _environment = _environment.Enclosing; } _environment.Assign(stmt.Name, klass); return(null); }
public LoxFunction Bind(LoxInstance instance) { var environment = new EnvironmentScope(_closure); environment.Define("this", instance); return(new LoxFunction(_declaration, environment, _isInitializer)); }
public Interpreter() { _environment = _globals; _globals.Define("clock", NativeLoxCallable.Create((i, args) => { return(DateTimeOffset.Now.ToUnixTimeSeconds()); }, 0)); }
public object Call(Interpreter interpreter, List <object> arguments) { var environment = new EnvironmentScope(_closure); for (var i = 0; i < _declaration.Parameters.Count; i++) { environment.Define(_declaration.Parameters[i].Lexeme, arguments[i]); } try { interpreter.ExecuteBlock(_declaration.Body, environment); } catch (Return @return) { return(@return.Value); } if (_isInitializer) { return(_closure.GetAt(0, "this")); } return(null); }