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![Mark Zhou](/assets/img/avatar_default.png)
Change-Id: Ib235c213861f819ed11a887283cad085582eaac7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/132941 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Mark Zhou <markzipan@google.com>
212 lines
6.3 KiB
Dart
212 lines
6.3 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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main() {
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List<int> list1 = <int>[1, 2, 3];
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List<int> list2 = const <int>[4, 5];
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List<String> list3 = <String>[];
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Set<int> set1 = new Set<int>();
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set1..add(11)..add(12)..add(13);
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Set set2 = new Set();
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Iterable<int> skip0 = list1.skip(0);
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Expect.isTrue(skip0 is! List);
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Iterator<int> it = skip0.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(1, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(2, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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Iterable<int> skip1 = list1.skip(1);
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Expect.isTrue(skip1 is! List);
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Expect.isTrue(skip1.skip(2).skip(1) is! List);
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it = skip1.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(2, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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Iterable<int> skip2 = list1.skip(2);
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Expect.isTrue(skip2 is! List);
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Expect.isTrue(skip2.skip(2).skip(1) is! List);
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it = skip2.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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Iterable<int> skip3 = list1.skip(3);
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Expect.isTrue(skip3 is! List);
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Expect.isTrue(skip3.skip(2).skip(1) is! List);
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it = skip3.iterator;
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Expect.isFalse(it.moveNext());
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Iterable<int> skip4 = list1.skip(4);
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Expect.isTrue(skip4 is! List);
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Expect.isTrue(skip4.skip(2).skip(1) is! List);
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it = skip4.iterator;
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Expect.isFalse(it.moveNext());
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skip0 = list1.skip(0);
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skip1 = skip0.skip(1);
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skip2 = skip1.skip(1);
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skip3 = skip2.skip(1);
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skip4 = skip3.skip(1);
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it = skip0.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(1, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(2, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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it = skip1.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(2, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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it = skip2.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(3, it.current);
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Expect.isFalse(it.moveNext());
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it = skip3.iterator;
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Expect.isFalse(it.moveNext());
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it = skip4.iterator;
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Expect.isFalse(it.moveNext());
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skip0 = list2.skip(0);
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Expect.isTrue(skip0 is! List);
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Expect.isTrue(skip0.skip(2).skip(1) is! List);
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it = skip0.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(4, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(5, it.current);
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Expect.isFalse(it.moveNext());
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skip1 = list2.skip(1);
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Expect.isTrue(skip1 is! List);
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Expect.isTrue(skip1.skip(2).skip(1) is! List);
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it = skip1.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(5, it.current);
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Expect.isFalse(it.moveNext());
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skip2 = list2.skip(2);
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Expect.isTrue(skip2 is! List);
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Expect.isTrue(skip2.skip(2).skip(1) is! List);
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it = skip2.iterator;
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Expect.isFalse(it.moveNext());
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skip3 = list2.skip(3);
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Expect.isTrue(skip3 is! List);
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Expect.isTrue(skip3.skip(2).skip(1) is! List);
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it = skip3.iterator;
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Expect.isFalse(it.moveNext());
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Iterable<String> skip02 = list3.skip(0);
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Expect.isTrue(skip02 is! List);
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Expect.isTrue(skip02.skip(2).skip(1) is! List);
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Iterator<String> it2 = skip02.iterator;
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Expect.isFalse(it2.moveNext());
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Iterable<String> skip12 = list3.skip(1);
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Expect.isTrue(skip12 is! List);
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Expect.isTrue(skip12.skip(2).skip(1) is! List);
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it2 = skip12.iterator;
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Expect.isFalse(it2.moveNext());
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skip0 = set1.skip(0);
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List<int> copied = skip0.toList();
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Expect.equals(3, copied.length);
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Expect.isTrue(set1.contains(copied[0]));
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Expect.isTrue(set1.contains(copied[1]));
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Expect.isTrue(set1.contains(copied[2]));
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Expect.isTrue(copied[0] != copied[1]);
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Expect.isTrue(copied[0] != copied[2]);
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Expect.isTrue(copied[1] != copied[2]);
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it = skip0.iterator;
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isFalse(it.moveNext());
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skip1 = set1.skip(1);
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copied = skip1.toList();
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Expect.equals(2, copied.length);
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Expect.isTrue(set1.contains(copied[0]));
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Expect.isTrue(set1.contains(copied[1]));
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Expect.isTrue(copied[0] != copied[1]);
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it = skip1.iterator;
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isFalse(it.moveNext());
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skip2 = set1.skip(2);
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copied = skip2.toList();
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Expect.equals(1, copied.length);
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Expect.isTrue(set1.contains(copied[0]));
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it = skip2.iterator;
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Expect.isTrue(it.moveNext());
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Expect.isNotNull(it.current);
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Expect.isFalse(it.moveNext());
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skip3 = set1.skip(3);
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it = skip3.iterator;
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Expect.isFalse(it.moveNext());
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skip4 = set1.skip(4);
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it = skip4.iterator;
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Expect.isFalse(it.moveNext());
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var dynamicSkip0 = set2.skip(0);
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var dynamicIt = dynamicSkip0.iterator;
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Expect.isFalse(dynamicIt.moveNext());
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var dynamicSkip1 = set2.skip(1);
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dynamicIt = dynamicSkip1.iterator;
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Expect.isFalse(dynamicIt.moveNext());
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testSkipTake(Iterable input, int skip, int take) {
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List expected = [];
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Iterator iter = input.iterator;
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for (int i = 0; i < skip; i++) iter.moveNext();
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for (int i = 0; i < take; i++) {
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if (!iter.moveNext()) break;
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expected.add(iter.current);
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}
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Expect.listEquals(expected, input.skip(skip).take(take).toList());
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}
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List longList = [1, 4, 5, 3, 8, 11, 12, 6, 9, 10, 13, 7, 2, 14, 15];
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Set bigSet = longList.toSet();
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for (Iterable collection in [longList, longList.reversed, bigSet]) {
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testSkipTake(collection, 0, 0);
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testSkipTake(collection, 0, 5);
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testSkipTake(collection, 0, 15);
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testSkipTake(collection, 0, 25);
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testSkipTake(collection, 5, 0);
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testSkipTake(collection, 5, 5);
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testSkipTake(collection, 5, 10);
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testSkipTake(collection, 5, 20);
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testSkipTake(collection, 15, 0);
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testSkipTake(collection, 15, 5);
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testSkipTake(collection, 20, 0);
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testSkipTake(collection, 20, 5);
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Expect.throwsRangeError(() => longList.skip(-1));
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}
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}
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