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// Copyright (c) 2012, 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";
main() {
testOperations();
}
class ThrowMarker {
const ThrowMarker();
String toString() => "<<THROWS>>";
}
void testOperations() {
// Comparison lists.
List l = const [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
List r = const [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
// Function that reverses l and r lists when used to map.
int rev(x) => 11 - x;
// A base list that starts out like l, but isn't const.
List base = l.map((x) => x).toList();
Iterable reversed = l.map(rev);
Expect.listEquals(r, l.map(rev).toList());
Expect.listEquals(l, l.map(rev).map(rev).toList());
for (int i = 0; i < r.length; i++) {
Expect.equals(r[i], reversed.elementAt(i));
}
Expect.equals(4, base.indexOf(5));
Expect.equals(5, reversed.toList().indexOf(5));
// Reversed followed by combinations of skip and take.
List subr = [8, 7, 6, 5, 4, 3];
Expect.listEquals(subr, reversed.skip(2).take(6).toList());
Expect.listEquals(subr, reversed.take(8).skip(2).toList());
Expect.listEquals(subr,
reversed.toList().reversed.skip(2).take(6).toList().reversed.toList());
Expect.listEquals(subr,
reversed.toList().reversed.take(8).skip(2).toList().reversed.toList());
Expect.listEquals(subr,
reversed.take(8).toList().reversed.take(6).toList().reversed.toList());
Expect.listEquals(subr,
reversed.toList().reversed.take(8).toList().reversed.take(6).toList());
Expect.listEquals(subr,
reversed.toList().reversed.skip(2).toList().reversed.skip(2).toList());
Expect.listEquals(subr,
reversed.skip(2).toList().reversed.skip(2).toList().reversed.toList());
void testList(List list) {
var throws = const ThrowMarker();
List mappedList = new List(list.length);
for (int i = 0; i < list.length; i++) {
mappedList[i] = rev(list[i]);
}
Iterable reversed = list.map(rev);
void testEquals(v1, v2, path) {
if (v1 is Iterable) {
Iterator i1 = v1.iterator;
Iterator i2 = v2.iterator;
int index = 0;
while (i1.moveNext()) {
Expect.isTrue(i2.moveNext(),
"Too few actual values. Expected[$index] == ${i1.current}");
testEquals(i1.current, i2.current, "$path[$index]");
index++;
}
if (i2.moveNext()) {
Expect.fail(
"Too many actual values. Actual[$index] == ${i2.current}");
}
} else {
Expect.equals(v1, v2, path);
}
}
void testOp(operation(Iterable mappedList), name) {
var expect;
try {
expect = operation(mappedList);
} catch (e) {
expect = throws;
}
var actual;
try {
actual = operation(reversed);
} catch (e) {
actual = throws;
}
testEquals(expect, actual, "$name: $list");
}
testOp((i) => i.first, "first");
testOp((i) => i.last, "last");
testOp((i) => i.single, "single");
testOp((i) => i.firstWhere((n) => false), "firstWhere<false");
testOp((i) => i.firstWhere((n) => n < 10), "firstWhere<10");
testOp((i) => i.firstWhere((n) => n < 5), "firstWhere<5");
testOp((i) => i.firstWhere((n) => true), "firstWhere<true");
testOp((i) => i.lastWhere((n) => false), "lastWhere<false");
testOp((i) => i.lastWhere((n) => n < 5), "lastWhere<5");
testOp((i) => i.lastWhere((n) => n < 10), "lastWhere<10");
testOp((i) => i.lastWhere((n) => true), "lastWhere<true");
testOp((i) => i.singleWhere((n) => false), "singleWhere<false");
testOp((i) => i.singleWhere((n) => n < 5), "singelWhere<5");
testOp((i) => i.singleWhere((n) => n < 10), "singelWhere<10");
testOp((i) => i.singleWhere((n) => true), "singleWhere<true");
testOp((i) => i.contains(5), "contains(5)");
testOp((i) => i.contains(10), "contains(10)");
testOp((i) => i.any((n) => n < 5), "any<5");
testOp((i) => i.any((n) => n < 10), "any<10");
testOp((i) => i.every((n) => n < 5), "every<5");
testOp((i) => i.every((n) => n < 10), "every<10");
testOp((i) => i.reduce((a, b) => a + b), "reduce-sum");
testOp((i) => i.fold(0, (a, b) => a + b), "fold-sum");
testOp((i) => i.join("-"), "join-");
testOp((i) => i.join(""), "join");
testOp((i) => i.join(), "join-null");
testOp((i) => i.map((n) => n * 2), "map*2");
testOp((i) => i.where((n) => n < 5), "where<5");
testOp((i) => i.where((n) => n < 10), "where<10");
testOp((i) => i.expand((n) => []), "expand[]");
testOp((i) => i.expand((n) => [n]), "expand[n]");
testOp((i) => i.expand((n) => [n, n]), "expand[n, n]");
testOp((i) => i.take(0), "take(0)");
testOp((i) => i.take(5), "take(5)");
testOp((i) => i.take(10), "take(10)");
testOp((i) => i.take(15), "take(15)");
testOp((i) => i.skip(0), "skip(0)");
testOp((i) => i.skip(5), "skip(5)");
testOp((i) => i.skip(10), "skip(10)");
testOp((i) => i.skip(15), "skip(15)");
testOp((i) => i.takeWhile((n) => false), "takeWhile(t)");
testOp((i) => i.takeWhile((n) => n < 5), "takeWhile(n<5)");
testOp((i) => i.takeWhile((n) => n > 5), "takeWhile(n>5)");
testOp((i) => i.takeWhile((n) => true), "takeWhile(f)");
testOp((i) => i.skipWhile((n) => false), "skipWhile(t)");
testOp((i) => i.skipWhile((n) => n < 5), "skipWhile(n<5)");
testOp((i) => i.skipWhile((n) => n > 5), "skipWhile(n>5)");
testOp((i) => i.skipWhile((n) => true), "skipWhile(f)");
}
// Combinations of lists with 0, 1 and more elements.
testList([]);
testList([0]);
testList([10]);
testList([0, 1]);
testList([0, 10]);
testList([10, 11]);
testList([0, 5, 10]);
testList([10, 5, 0]);
testList([0, 1, 2, 3]);
testList([3, 4, 5, 6]);
testList([10, 11, 12, 13]);
testList(l);
testList(r);
testList(base);
// Reverse const list.
Expect.listEquals(r, l.map(rev).toList());
}