public object VisitAssignExpr(Expr.Assign expr) { object value = Evaluate(expr.value); if (locals.TryGetValue(expr, out int distance)) { environment.AssignAt(distance, expr.name, value); } else { globals.Assign(expr.name, value); } return(value); }
public void Assign(Token name, Object value) { if (values.ContainsKey(name.lexeme)) { values[name.lexeme] = value; return; } if (enclosing != null) { enclosing.Assign(name, value); return; } throw new RuntimeError(name, $"Undefined variable'{name.lexeme}'."); }
public MyVoid VisitClassStmt(Stmt.Class stmt) { environment.Define(stmt.name.lexeme, null); Dictionary <string, LoxFunction> methods = new Dictionary <string, LoxFunction>(); foreach (Stmt.Function method in stmt.methods) { LoxFunction function = new LoxFunction(method, environment, isInitializer: method.name.lexeme == "init"); methods[method.name.lexeme] = function; } LoxClass klass = new LoxClass(stmt.name.lexeme, methods); environment.Assign(stmt.name, new LoxClass(stmt.name.lexeme, methods)); return(null); }