// Copyright (c) 2017, 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.

/// @assertion Iterable<E> takeWhile(bool test(E value))
/// Returns a lazy iterable of the leading elements satisfying test.
/// @description Checks that the returned iterable contains leading elements of
/// Int32x4List that satisfy test.
/// @author ngl@unipro.ru

import "dart:typed_data";
import "../../../Utils/expect.dart";

Int32x4 i32x4(n) => new Int32x4(n, n, n, n);

equal(o1, o2) => o1.x == o2.x && o1.y == o2.y && o1.z == o2.z && o1.w == o2.w;

check(list, bool test(Int32x4 e)) {
  var l = new Int32x4List.fromList(list);
  var res = l.takeWhile(test);
  var it1 = l.iterator;
  var it2 = res.iterator;
  var count = 0;
  var size = 0;

  Expect.isTrue(res is Iterable);
  Expect.runtimeIsType<Iterable>(res);

  while (it2.moveNext()) {
    if (test(it2.current)) {
      size++;
      it1.moveNext();
      Expect.isTrue(test(it1.current));
      Expect.isTrue(equal(it1.current, it2.current));
    } else break;
  }
  Expect.equals(size, res.length);

  while (it1.moveNext()) {
    count++;
  }
  Expect.equals(l.length, size + count);
}

main() {
  var list = [i32x4(0), i32x4(1), i32x4(2), i32x4(6), i32x4(4), i32x4(5)];
  check(list, (e) => true);
  check(list, (e) => false);
  check(list, (e) => e.x == 0);
  check(list, (e) => e.x > 4);
  check(list, (e) => e.x < 4);
  check(list, (e) => e.x == 4);
}