| // Copyright (c) 2012, 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. |
| |
| // Factory classes constructing mutable List and Map objects from parser |
| // generated list and map literals. |
| |
| class _ListLiteralFactory<E> { |
| // [elements] contains elements that are already type checked. |
| factory List.fromLiteral(List elements) { |
| var list = new List<E>(); |
| if (elements.length > 0) { |
| list._setData(elements); |
| list.length = elements.length; |
| } |
| return list; |
| } |
| } |
| |
| // Factory class constructing mutable List and Map objects from parser generated |
| // list and map literals. |
| |
| class _MapLiteralFactory<K, V> { |
| // [elements] contains n key-value pairs. |
| // The keys are at position 2*n and are already type checked by the parser |
| // in checked mode. |
| // The values are at position 2*n+1 and are not yet type checked. |
| factory Map.fromLiteral(List elements) { |
| var map = new LinkedHashMap<String, V>(); |
| var len = elements.length; |
| for (int i = 1; i < len; i += 2) { |
| map[elements[i - 1]] = elements[i]; |
| } |
| return map; |
| } |
| } |
| |