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0672317bec10248262da17070627fa8f01736788
sdk/tests/corelib/iterable_skip_test.dart
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lrn@google.com b7f36d0d11 Make List.skip, List.take and List.reversed return Iterables, not Lists. 
Removes ListView. It was premature optimization to have classes that combined any sequence of reverse, skip and take instead of just wrapping iterables.

Review URL: https://codereview.chromium.org//12262037

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18570 260f80e4-7a28-3924-810f-c04153c831b5
2013-02-15 10:43:21 +00:00

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// 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.
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);
skip0 = set2.skip(0);
it = skip0.iterator;
Expect.isNull(it.current);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
skip1 = set2.skip(1);
it = skip1.iterator;
Expect.isNull(it.current);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
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