| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:analyzer/dart/ast/ast.dart'; |
| |
| /// Abstraction layer allowing the mechanism for looking up the elements of |
| /// collections to be customized. |
| /// |
| /// This is needed for the NNBD migration engine, which needs to be able to |
| /// re-run resolution on code for which certain collection elements have been |
| /// removed or changed due to dead code elimination.. |
| /// |
| /// This base class implementation gets elements directly from the collections; |
| /// for other behaviors, create a class that extends or implements this class. |
| class CollectionElementProvider { |
| const CollectionElementProvider(); |
| |
| /// Gets the elements contained in a [ListLiteral]. |
| List<CollectionElement> getListElements(ListLiteral node) => node.elements; |
| |
| /// Gets the elements contained in a [SetOrMapLiteral]. |
| List<CollectionElement> getSetOrMapElements(SetOrMapLiteral node) => |
| node.elements; |
| } |