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// 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.
import "package:expect/expect.dart";
testGetRange(list, start, end, bool isModifiable) {
Expect.throwsRangeError(() => list.getRange(-1, 0));
Expect.throwsRangeError(() => list.getRange(0, -1));
Expect.throwsRangeError(() => list.getRange(1, 0));
Expect.throwsRangeError(() => list.getRange(0, list.length + 1));
Expect.throwsRangeError(
() => list.getRange(list.length + 1, list.length + 1));
Iterable iterable = list.getRange(start, end);
Expect.isFalse(iterable is List);
if (start == end) {
Expect.isTrue(iterable.isEmpty);
return;
}
var iterator = iterable.iterator;
for (int i = start; i < end; i++) {
Expect.isTrue(iterator.moveNext());
Expect.equals(iterator.current, list[i]);
}
Expect.isFalse(iterator.moveNext());
if (isModifiable) {
for (int i = 0; i < list.length; i++) {
list[i]++;
}
iterator = iterable.iterator;
for (int i = start; i < end; i++) {
Expect.isTrue(iterator.moveNext());
Expect.equals(iterator.current, list[i]);
}
}
}
main() {
testGetRange([1, 2], 0, 1, true);
testGetRange([], 0, 0, true);
testGetRange([1, 2, 3], 0, 0, true);
testGetRange([1, 2, 3], 1, 3, true);
testGetRange(const [1, 2], 0, 1, false);
testGetRange(const [], 0, 0, false);
testGetRange(const [1, 2, 3], 0, 0, false);
testGetRange(const [1, 2, 3], 1, 3, false);
testGetRange("abcd".codeUnits, 0, 1, false);
testGetRange("abcd".codeUnits, 0, 0, false);
testGetRange("abcd".codeUnits, 1, 3, false);
Expect.throwsRangeError(() => [1].getRange(-1, 1));
Expect.throwsRangeError(() => [3].getRange(0, -1));
Expect.throwsRangeError(() => [4].getRange(1, 0));
var list = [1, 2, 3, 4];
var iterable = list.getRange(1, 3);
Expect.equals(2, iterable.first);
Expect.equals(3, iterable.last);
list.length = 1;
Expect.isTrue(iterable.isEmpty);
list.add(99);
Expect.equals(99, iterable.single);
list.add(499);
Expect.equals(499, iterable.last);
Expect.equals(2, iterable.length);
}