| // 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. |
| |
| // Note that the optimizing compiler depends on the algorithm which |
| // returns a _GrowableObjectArray if length is null, otherwise returns |
| // fixed size array. |
| patch class List<E> { |
| /* patch */ factory List([int length = 0]) { |
| if ((length is! int) || (length < 0)) { |
| _throwArgumentError(length); |
| } |
| _GrowableObjectArray<E> result = new _GrowableObjectArray<E>(length); |
| return result; |
| } |
| |
| /* patch */ factory List.fixedLength(int length, {E fill: null}) { |
| if ((length is! int) || (length < 0)) { |
| _throwArgumentError(length); |
| } |
| _ObjectArray<E> result = new _ObjectArray<E>(length); |
| if (fill != null) { |
| for (int i = 0; i < length; i++) { |
| result[i] = fill; |
| } |
| } |
| return result; |
| } |
| |
| // Factory constructing a mutable List from a parser generated List literal. |
| // [elements] contains elements that are already type checked. |
| factory List._fromLiteral(List elements) { |
| if (elements.isEmpty) { |
| return new _GrowableObjectArray<E>(0); |
| } |
| var result = new _GrowableObjectArray<E>.withData(elements); |
| result._setLength(elements.length); |
| return result; |
| } |
| |
| static void _throwArgumentError(int length) { |
| throw new ArgumentError("Length must be a positive integer: $length."); |
| } |
| } |