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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 class _Lists { | |
| 6 | |
| 7 /** | |
| 8 * Returns the index in the array [a] of the given [element], starting | |
| 9 * the search at index [startIndex] to [endIndex] (exclusive). | |
| 10 * Returns -1 if [element] is not found. | |
| 11 */ | |
| 12 static int indexOf(List a, | |
| 13 Object element, | |
| 14 int startIndex, | |
| 15 int endIndex) { | |
| 16 if (startIndex >= a.length) { | |
| 17 return -1; | |
| 18 } | |
| 19 if (startIndex < 0) { | |
| 20 startIndex = 0; | |
| 21 } | |
| 22 for (int i = startIndex; i < endIndex; i++) { | |
| 23 if (a[i] == element) { | |
| 24 return i; | |
| 25 } | |
| 26 } | |
| 27 return -1; | |
| 28 } | |
| 29 | |
| 30 /** | |
| 31 * Returns the last index in the array [a] of the given [element], starting | |
| 32 * the search at index [startIndex] to 0. | |
| 33 * Returns -1 if [element] is not found. | |
| 34 */ | |
| 35 static int lastIndexOf(List a, Object element, int startIndex) { | |
| 36 if (startIndex < 0) { | |
| 37 return -1; | |
| 38 } | |
| 39 if (startIndex >= a.length) { | |
| 40 startIndex = a.length - 1; | |
| 41 } | |
| 42 for (int i = startIndex; i >= 0; i--) { | |
| 43 if (a[i] == element) { | |
| 44 return i; | |
| 45 } | |
| 46 } | |
| 47 return -1; | |
| 48 } | |
| 49 | |
| 50 /** | |
| 51 * Returns a sub list copy of this list, from [start] to | |
| 52 * [:start + length:]. | |
| 53 * Returns an empty list if [length] is 0. | |
| 54 * Throws an [IllegalArgumentException] if [length] is negative. | |
| 55 * Throws an [IndexOutOfRangeException] if [start] or | |
| 56 * [:start + length:] are out of range. | |
| 57 */ | |
| 58 static List getRange(List a, int start, int length, List accumulator) { | |
| 59 if (length < 0) throw new IllegalArgumentException('length'); | |
| 60 if (start < 0) throw new IndexOutOfRangeException(start); | |
| 61 int end = start + length; | |
| 62 if (end > a.length) throw new IndexOutOfRangeException(end); | |
| 63 for (int i = start; i < end; i++) { | |
| 64 accumulator.add(a[i]); | |
| 65 } | |
| 66 return accumulator; | |
| 67 } | |
| 68 } | |
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