| /* |
| * 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. |
| */ |
| /** |
| * @assertion Iterable<E> takeWhile(bool test(E value)) |
| * Returns a lazy iterable of the leading elements satisfying [test]. |
| * @description Checks that all first elements that satisfy [test] are retained, |
| * and elements after are skipped. |
| * @author kaigorodov |
| */ |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(List a0, bool test(var element)) { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a0); |
| Iterator it0 = a0.iterator; |
| Iterable a = queue.takeWhile(test); |
| Iterator it = a.iterator; |
| |
| // check that the beginning of a0 is identical to a |
| bool hasNext0 = it0.moveNext(); |
| int len = 0; |
| for (;;) { |
| bool hasNext = it.moveNext(); |
| if (!hasNext) break; |
| Expect.isTrue(test(it0.current)); |
| Expect.equals(it0.current, it.current); |
| len++; |
| hasNext0 = it0.moveNext(); |
| } |
| Expect.equals(a.length, len); |
| |
| // count the rest |
| int skipCount = 0; |
| while (hasNext0) { |
| skipCount++; |
| hasNext0 = it0.moveNext(); |
| } |
| |
| Expect.equals(a0.length, len + skipCount); |
| } |
| |
| main() { |
| List a0=[1, 3, 7, 4, 5, 6]; |
| check(a0, (var element) => element == 1); |
| check(a0, (var element) => true); |
| check(a0, (var element) => false); |
| check(a0, (var element) => element > 4); |
| check(a0, (var element) => element < 4); |
| check(a0, (var element) => element == 4); |
| } |