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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 part of html_common; |
| 6 |
| 7 class Lists { |
| 8 |
| 9 /** |
| 10 * Returns the index in the array [a] of the given [element], starting |
| 11 * the search at index [startIndex] to [endIndex] (exclusive). |
| 12 * Returns -1 if [element] is not found. |
| 13 */ |
| 14 static int indexOf(List a, |
| 15 Object element, |
| 16 int startIndex, |
| 17 int endIndex) { |
| 18 if (startIndex >= a.length) { |
| 19 return -1; |
| 20 } |
| 21 if (startIndex < 0) { |
| 22 startIndex = 0; |
| 23 } |
| 24 for (int i = startIndex; i < endIndex; i++) { |
| 25 if (a[i] == element) { |
| 26 return i; |
| 27 } |
| 28 } |
| 29 return -1; |
| 30 } |
| 31 |
| 32 /** |
| 33 * Returns the last index in the array [a] of the given [element], starting |
| 34 * the search at index [startIndex] to 0. |
| 35 * Returns -1 if [element] is not found. |
| 36 */ |
| 37 static int lastIndexOf(List a, Object element, int startIndex) { |
| 38 if (startIndex < 0) { |
| 39 return -1; |
| 40 } |
| 41 if (startIndex >= a.length) { |
| 42 startIndex = a.length - 1; |
| 43 } |
| 44 for (int i = startIndex; i >= 0; i--) { |
| 45 if (a[i] == element) { |
| 46 return i; |
| 47 } |
| 48 } |
| 49 return -1; |
| 50 } |
| 51 |
| 52 /** |
| 53 * Returns a sub list copy of this list, from [start] to |
| 54 * [end] ([end] not inclusive). |
| 55 * Returns an empty list if [length] is 0. |
| 56 * It is an error if indices are not valid for the list, or |
| 57 * if [end] is before [start]. |
| 58 */ |
| 59 static List getRange(List a, int start, int end, List accumulator) { |
| 60 if (start < 0) throw new RangeError.value(start); |
| 61 if (end < start) throw new RangeError.value(end); |
| 62 if (end > a.length) throw new RangeError.value(end); |
| 63 for (int i = start; i < end; i++) { |
| 64 accumulator.add(a[i]); |
| 65 } |
| 66 return accumulator; |
| 67 } |
| 68 } |
| 69 |
| 70 /** |
| 71 * For accessing underlying node lists, for dart:js interop. |
| 72 */ |
| 73 abstract class NodeListWrapper { |
| 74 List<Node> get rawList; |
| 75 } |
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