| // 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| main() { |
| List<int> list1 = <int>[1, 2, 3]; |
| List<int> list2 = const <int>[4, 5]; |
| List<String> list3 = <String>[]; |
| Set<int> set1 = new Set<int>(); |
| set1..add(11)..add(12)..add(13); |
| Set set2 = new Set(); |
| |
| Iterable<int> skip0 = list1.skip(0); |
| Expect.isTrue(skip0 is! List); |
| Iterator<int> it = skip0.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(1, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(2, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| Iterable<int> skip1 = list1.skip(1); |
| Expect.isTrue(skip1 is! List); |
| Expect.isTrue(skip1.skip(2).skip(1) is! List); |
| it = skip1.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(2, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| Iterable<int> skip2 = list1.skip(2); |
| Expect.isTrue(skip2 is! List); |
| Expect.isTrue(skip2.skip(2).skip(1) is! List); |
| it = skip2.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| Iterable<int> skip3 = list1.skip(3); |
| Expect.isTrue(skip3 is! List); |
| Expect.isTrue(skip3.skip(2).skip(1) is! List); |
| it = skip3.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| Iterable<int> skip4 = list1.skip(4); |
| Expect.isTrue(skip4 is! List); |
| Expect.isTrue(skip4.skip(2).skip(1) is! List); |
| it = skip4.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip0 = list1.skip(0); |
| skip1 = skip0.skip(1); |
| skip2 = skip1.skip(1); |
| skip3 = skip2.skip(1); |
| skip4 = skip3.skip(1); |
| it = skip0.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(1, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(2, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| it = skip1.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(2, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| it = skip2.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(3, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| it = skip3.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| it = skip4.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip0 = list2.skip(0); |
| Expect.isTrue(skip0 is! List); |
| Expect.isTrue(skip0.skip(2).skip(1) is! List); |
| it = skip0.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(4, it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(5, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip1 = list2.skip(1); |
| Expect.isTrue(skip1 is! List); |
| Expect.isTrue(skip1.skip(2).skip(1) is! List); |
| it = skip1.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.equals(5, it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip2 = list2.skip(2); |
| Expect.isTrue(skip2 is! List); |
| Expect.isTrue(skip2.skip(2).skip(1) is! List); |
| it = skip2.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip3 = list2.skip(3); |
| Expect.isTrue(skip3 is! List); |
| Expect.isTrue(skip3.skip(2).skip(1) is! List); |
| it = skip3.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| Iterable<String> skip02 = list3.skip(0); |
| Expect.isTrue(skip02 is! List); |
| Expect.isTrue(skip02.skip(2).skip(1) is! List); |
| Iterator<String> it2 = skip02.iterator; |
| Expect.isNull(it2.current); |
| Expect.isFalse(it2.moveNext()); |
| Expect.isNull(it2.current); |
| |
| Iterable<String> skip12 = list3.skip(1); |
| Expect.isTrue(skip12 is! List); |
| Expect.isTrue(skip12.skip(2).skip(1) is! List); |
| it2 = skip12.iterator; |
| Expect.isNull(it2.current); |
| Expect.isFalse(it2.moveNext()); |
| Expect.isNull(it2.current); |
| |
| skip0 = set1.skip(0); |
| List<int> copied = skip0.toList(); |
| Expect.equals(3, copied.length); |
| Expect.isTrue(set1.contains(copied[0])); |
| Expect.isTrue(set1.contains(copied[1])); |
| Expect.isTrue(set1.contains(copied[2])); |
| Expect.isTrue(copied[0] != copied[1]); |
| Expect.isTrue(copied[0] != copied[2]); |
| Expect.isTrue(copied[1] != copied[2]); |
| it = skip0.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip1 = set1.skip(1); |
| copied = skip1.toList(); |
| Expect.equals(2, copied.length); |
| Expect.isTrue(set1.contains(copied[0])); |
| Expect.isTrue(set1.contains(copied[1])); |
| Expect.isTrue(copied[0] != copied[1]); |
| it = skip1.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip2 = set1.skip(2); |
| copied = skip2.toList(); |
| Expect.equals(1, copied.length); |
| Expect.isTrue(set1.contains(copied[0])); |
| it = skip2.iterator; |
| Expect.isNull(it.current); |
| Expect.isTrue(it.moveNext()); |
| Expect.isNotNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip3 = set1.skip(3); |
| it = skip3.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| skip4 = set1.skip(4); |
| it = skip4.iterator; |
| Expect.isNull(it.current); |
| Expect.isFalse(it.moveNext()); |
| Expect.isNull(it.current); |
| |
| var dynamicSkip0 = set2.skip(0); |
| var dynamicIt = dynamicSkip0.iterator; |
| Expect.isNull(dynamicIt.current); |
| Expect.isFalse(dynamicIt.moveNext()); |
| Expect.isNull(dynamicIt.current); |
| |
| var dynamicSkip1 = set2.skip(1); |
| dynamicIt = dynamicSkip1.iterator; |
| Expect.isNull(dynamicIt.current); |
| Expect.isFalse(dynamicIt.moveNext()); |
| Expect.isNull(dynamicIt.current); |
| |
| testSkipTake(Iterable input, int skip, int take) { |
| List expected = []; |
| Iterator iter = input.iterator; |
| for (int i = 0; i < skip; i++) iter.moveNext(); |
| for (int i = 0; i < take; i++) { |
| if (!iter.moveNext()) break; |
| expected.add(iter.current); |
| } |
| Expect.listEquals(expected, input.skip(skip).take(take).toList()); |
| } |
| |
| List longList = [1, 4, 5, 3, 8, 11, 12, 6, 9, 10, 13, 7, 2, 14, 15]; |
| Set bigSet = longList.toSet(); |
| |
| for (Iterable collection in [longList, longList.reversed, bigSet]) { |
| testSkipTake(collection, 0, 0); |
| testSkipTake(collection, 0, 5); |
| testSkipTake(collection, 0, 15); |
| testSkipTake(collection, 0, 25); |
| testSkipTake(collection, 5, 0); |
| testSkipTake(collection, 5, 5); |
| testSkipTake(collection, 5, 10); |
| testSkipTake(collection, 5, 20); |
| testSkipTake(collection, 15, 0); |
| testSkipTake(collection, 15, 5); |
| testSkipTake(collection, 20, 0); |
| testSkipTake(collection, 20, 5); |
| Expect.throwsRangeError(() => longList.skip(-1)); |
| } |
| } |