blob: c7a486d5ca567e6e83bd6b0baed8643c1b2a81c1 [file] [log] [blame]
// 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));
}
}