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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>
87 lines
2.4 KiB
Dart
87 lines
2.4 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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main() {
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test(String s, List<int> expectedRunes) {
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Runes runes = s.runes;
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Expect.identical(s, runes.string);
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// for-in
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var res = [];
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for (int rune in runes) {
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res.add(rune);
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}
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Expect.listEquals(expectedRunes, res);
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// manual iteration, backwards.
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res = [];
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for (var it = runes.iterator..reset(s.length); it.movePrevious();) {
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res.add(it.current);
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}
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Expect.listEquals(expectedRunes.reversed.toList(), res);
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// Setting rawIndex.
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RuneIterator it = runes.iterator;
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it.rawIndex = 1;
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Expect.equals(expectedRunes[1], it.current);
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it = runes.iterator;
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it.moveNext();
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Expect.equals(0, it.rawIndex);
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it.moveNext();
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Expect.equals(1, it.rawIndex);
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it.moveNext();
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Expect.isTrue(1 < it.rawIndex);
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it.rawIndex = 1;
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Expect.equals(1, it.rawIndex);
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Expect.equals(expectedRunes[1], it.current);
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// Reset, moveNext.
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it.reset(1);
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Expect.equals(-1, it.rawIndex);
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Expect.equals(-1, it.current);
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it.moveNext();
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Expect.equals(1, it.rawIndex);
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Expect.equals(expectedRunes[1], it.current);
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// Reset, movePrevious.
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it.reset(1);
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Expect.equals(-1, it.rawIndex);
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Expect.equals(-1, it.current);
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it.movePrevious();
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Expect.equals(0, it.rawIndex);
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Expect.equals(expectedRunes[0], it.current);
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// .map
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Expect.listEquals(expectedRunes.map((x) => x.toRadixString(16)).toList(),
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runes.map((x) => x.toRadixString(16)).toList());
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}
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// First character must be single-code-unit for test.
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test("abc", [0x61, 0x62, 0x63]);
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test("\x00\u0000\u{000000}", [0, 0, 0]);
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test("\u{ffff}\u{10000}\u{10ffff}", [0xffff, 0x10000, 0x10ffff]);
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String string = new String.fromCharCodes(
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[0xdc00, 0xd800, 61, 0xd800, 0xdc00, 62, 0xdc00, 0xd800]);
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test(string, [0xdc00, 0xd800, 61, 0x10000, 62, 0xdc00, 0xd800]);
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// Setting position in the middle of a surrogate pair is not allowed.
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var r = new Runes("\u{10000}");
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var it = r.iterator;
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it.moveNext();
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Expect.equals(0x10000, it.current);
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// Setting rawIndex inside surrogate pair.
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Expect.throws(() {
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it.rawIndex = 1;
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}, (e) => e is Error);
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Expect.throws(() {
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it.reset(1);
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}, (e) => e is Error);
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}
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