| // Copyright (c) 2011, 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| testGetRange(list, start, end, bool isModifiable) { |
| Expect.throwsRangeError(() => list.getRange(-1, 0)); |
| Expect.throwsRangeError(() => list.getRange(0, -1)); |
| Expect.throwsRangeError(() => list.getRange(1, 0)); |
| Expect.throwsRangeError(() => list.getRange(0, list.length + 1)); |
| Expect.throwsRangeError( |
| () => list.getRange(list.length + 1, list.length + 1)); |
| Iterable iterable = list.getRange(start, end); |
| Expect.isFalse(iterable is List); |
| if (start == end) { |
| Expect.isTrue(iterable.isEmpty); |
| return; |
| } |
| |
| var iterator = iterable.iterator; |
| for (int i = start; i < end; i++) { |
| Expect.isTrue(iterator.moveNext()); |
| Expect.equals(iterator.current, list[i]); |
| } |
| Expect.isFalse(iterator.moveNext()); |
| |
| if (isModifiable) { |
| for (int i = 0; i < list.length; i++) { |
| list[i]++; |
| } |
| |
| iterator = iterable.iterator; |
| for (int i = start; i < end; i++) { |
| Expect.isTrue(iterator.moveNext()); |
| Expect.equals(iterator.current, list[i]); |
| } |
| } |
| } |
| |
| main() { |
| testGetRange([1, 2], 0, 1, true); |
| testGetRange([], 0, 0, true); |
| testGetRange([1, 2, 3], 0, 0, true); |
| testGetRange([1, 2, 3], 1, 3, true); |
| testGetRange(const [1, 2], 0, 1, false); |
| testGetRange(const [], 0, 0, false); |
| testGetRange(const [1, 2, 3], 0, 0, false); |
| testGetRange(const [1, 2, 3], 1, 3, false); |
| testGetRange("abcd".codeUnits, 0, 1, false); |
| testGetRange("abcd".codeUnits, 0, 0, false); |
| testGetRange("abcd".codeUnits, 1, 3, false); |
| |
| Expect.throwsRangeError(() => [1].getRange(-1, 1)); |
| Expect.throwsRangeError(() => [3].getRange(0, -1)); |
| Expect.throwsRangeError(() => [4].getRange(1, 0)); |
| |
| var list = [1, 2, 3, 4]; |
| var iterable = list.getRange(1, 3); |
| Expect.equals(2, iterable.first); |
| Expect.equals(3, iterable.last); |
| list.length = 1; |
| Expect.isTrue(iterable.isEmpty); |
| list.add(99); |
| Expect.equals(99, iterable.single); |
| list.add(499); |
| Expect.equals(499, iterable.last); |
| Expect.equals(2, iterable.length); |
| } |