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https://github.com/dart-lang/sdk
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b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
72 lines
2.2 KiB
Dart
72 lines
2.2 KiB
Dart
// Copyright (c) 2011, 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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// @dart = 2.9
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import "package:expect/expect.dart";
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testGetRange(list, start, end, bool isModifiable) {
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Expect.throwsRangeError(() => list.getRange(-1, 0));
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Expect.throwsRangeError(() => list.getRange(0, -1));
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Expect.throwsRangeError(() => list.getRange(1, 0));
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Expect.throwsRangeError(() => list.getRange(0, list.length + 1));
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Expect.throwsRangeError(
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() => list.getRange(list.length + 1, list.length + 1));
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Iterable iterable = list.getRange(start, end);
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Expect.isFalse(iterable is List);
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if (start == end) {
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Expect.isTrue(iterable.isEmpty);
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return;
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}
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var iterator = iterable.iterator;
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for (int i = start; i < end; i++) {
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Expect.isTrue(iterator.moveNext());
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Expect.equals(iterator.current, list[i]);
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}
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Expect.isFalse(iterator.moveNext());
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if (isModifiable) {
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for (int i = 0; i < list.length; i++) {
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list[i]++;
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}
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iterator = iterable.iterator;
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for (int i = start; i < end; i++) {
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Expect.isTrue(iterator.moveNext());
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Expect.equals(iterator.current, list[i]);
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}
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}
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}
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main() {
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testGetRange([1, 2], 0, 1, true);
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testGetRange([], 0, 0, true);
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testGetRange([1, 2, 3], 0, 0, true);
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testGetRange([1, 2, 3], 1, 3, true);
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testGetRange(const [1, 2], 0, 1, false);
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testGetRange(const [], 0, 0, false);
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testGetRange(const [1, 2, 3], 0, 0, false);
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testGetRange(const [1, 2, 3], 1, 3, false);
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testGetRange("abcd".codeUnits, 0, 1, false);
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testGetRange("abcd".codeUnits, 0, 0, false);
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testGetRange("abcd".codeUnits, 1, 3, false);
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Expect.throwsRangeError(() => [1].getRange(-1, 1));
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Expect.throwsRangeError(() => [3].getRange(0, -1));
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Expect.throwsRangeError(() => [4].getRange(1, 0));
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var list = [1, 2, 3, 4];
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var iterable = list.getRange(1, 3);
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Expect.equals(2, iterable.first);
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Expect.equals(3, iterable.last);
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list.length = 1;
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Expect.isTrue(iterable.isEmpty);
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list.add(99);
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Expect.equals(99, iterable.single);
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list.add(499);
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Expect.equals(499, iterable.last);
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Expect.equals(2, iterable.length);
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}
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