public LoxFunction Bind(LoxInstance instance) { VariableEnvironment environment = new VariableEnvironment(closure); environment.Define("this", instance); return(new LoxFunction(declaration, environment, isInitializer)); }
public object Call(Interpreter interpreter, List <object> arguments) { VariableEnvironment environment = new VariableEnvironment(closure); for (int i = 0; i < declaration.parameters.Count; i++) { environment.Define(declaration.parameters[i].lexeme, arguments[i]); } try { interpreter.ExecuteBlock(declaration.body, environment); } catch (Return returnValue) { // Allow an empty return ("return;") in a constructor. When this happens, return "this". if (isInitializer) { return(closure.GetAt(0, "this")); } return(returnValue.value); } return(null); }
public Interpreter() { this.globals = new VariableEnvironment(); this.environment = globals; //Define built-in function to get the time in milliseconds globals.Define("clock", new ClockFn()); }
VariableEnvironment Ancestor(int distance) { VariableEnvironment environment = this; for (int i = 0; i < distance; i++) { environment = environment.enclosing; } return(environment); }
public void ExecuteBlock(List <Stmt> statements, VariableEnvironment environment) { //save the last environment (to be restored later) VariableEnvironment previous = this.environment; try { //change environment to the given one, and execute statments with this new environment this.environment = environment; foreach (Stmt statement in statements) { Execute(statement); } } finally { //even if there's an exception, we need to restore the last environment before continuing this.environment = previous; } }
public VariableEnvironment(VariableEnvironment enclosing) { this.enclosing = enclosing; }
public VariableEnvironment() { enclosing = null; }
public LoxFunction(Stmt.Function declaration, VariableEnvironment closure, Boolean isInitializer) { this.closure = closure; this.declaration = declaration; this.isInitializer = isInitializer; }