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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.
// @dart = 2.9
// Sanity check on the growing behavior of a growable list.
import "package:expect/expect.dart";
void main() {
testConstructor();
// Concurrent modification checks are only guaranteed in checked mode.
testConcurrentModification();
}
// Iterable generating numbers in range [0..count).
// May perform callback at some point underways.
class TestIterableBase extends Iterable<int> {
final int length;
final int count;
// call [callback] if generating callbackIndex.
final int callbackIndex;
final Function callback;
TestIterableBase(this.length, this.count, this.callbackIndex, this.callback);
Iterator<int> get iterator => new CallbackIterator(this);
}
class TestIterable extends TestIterableBase {
TestIterable(count, [callbackIndex = -1, callback])
: super(-1, count, callbackIndex, callback);
int get length => throw "SHOULD NOT BE CALLED";
}
// Implement Set for private EfficientLengthIterable interface.
class EfficientTestIterable extends TestIterableBase implements Set<int> {
EfficientTestIterable(length, count, [callbackIndex = -1, callback])
: super(length, count, callbackIndex, callback);
// Avoid warnings because we don't actually implement Set.
noSuchMethod(i) => super.noSuchMethod(i);
Set<R> cast<R>() => throw "not used by test";
}
class CallbackIterator implements Iterator<int> {
TestIterableBase _iterable;
int _current = null;
int _nextIndex = 0;
CallbackIterator(this._iterable);
bool moveNext() {
if (_nextIndex >= _iterable.count) {
_current = null;
return false;
}
_current = _nextIndex;
_nextIndex++;
if (_current == _iterable.callbackIndex) {
_iterable.callback();
}
return true;
}
int get current => _current;
}
void testConstructor() {
// Constructor can make both growable and fixed-length lists.
testGrowable(list) {
Expect.isTrue(list is List<int>);
Expect.isFalse(list is List<String>);
int length = list.length;
list.add(42);
Expect.equals(list.length, length + 1);
}
testFixedLength(list) {
Expect.isTrue(list is List<int>);
int length = list.length;
Expect.throws(() {
list.add(42);
}, null, "adding to fixed-length list");
Expect.equals(length, list.length);
}
testThrowsOrTypeError(fn, [name]) {
Expect.throws(fn, null, name);
}
testFixedLength(new List<int>(0));
testFixedLength(new List<int>(5));
testFixedLength(new List<int>.filled(5, null)); // default growable: false.
testGrowable(new List<int>());
testGrowable(new List<int>()..length = 5);
testGrowable(new List<int>.filled(5, null, growable: true));
Expect.throwsArgumentError(() => new List<int>(-1), "-1");
// There must be limits. Fix this test if we ever allow 2^63 elements.
Expect.throws(() => new List<int>(0x7ffffffffffff000),
(e) => e is OutOfMemoryError || e is ArgumentError, "bignum");
Expect.throwsArgumentError(() => new List<int>(null), "null");
testThrowsOrTypeError(
() => new List([] as Object), // Cast to avoid warning.
'list');
testThrowsOrTypeError(() => new List([42] as Object), "list2");
}
void testConcurrentModification() {
// Without EfficientLengthIterable interface
{
// Change length of list after 200 additions.
var l = [];
var ci = new TestIterable(257, 200, () {
l.add("X");
});
Expect.throws(() {
l.addAll(ci);
}, (e) => e is ConcurrentModificationError, "cm1");
}
{
// Change length of list after 200 additions.
var l = [];
var ci = new TestIterable(257, 200, () {
l.length = 0;
});
Expect.throws(() {
l.addAll(ci);
}, (e) => e is ConcurrentModificationError, "cm2");
}
// With EfficientLengthIterable interface (uses length).
{
// Change length of list after 20 additions.
var l = [];
var ci = new EfficientTestIterable(257, 257, 20, () {
l.add("X");
});
Expect.throws(() {
l.addAll(ci);
}, (e) => e is ConcurrentModificationError, "cm3");
}
{
var l = [];
var ci = new EfficientTestIterable(257, 257, 20, () {
l.length = 0;
});
Expect.throws(() {
l.addAll(ci);
}, (e) => e is ConcurrentModificationError, "cm4");
}
{
// Length 500, only 250 elements.
var l = [];
var ci = new EfficientTestIterable(500, 250);
l.addAll(ci);
Expect.listEquals(new List.generate(250, (x) => x), l, "cm5");
}
{
// Length 250, but 500 elements.
var l = [];
var ci = new EfficientTestIterable(250, 500);
l.addAll(ci);
Expect.listEquals(new List.generate(500, (x) => x), l, "cm6");
}
}