LibTest/collection/LinkedList/skipWhile_A01_t01.dart

/*
 * 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.
 */
/**
 * @assertion Iterable<E> skipWhile(bool test(E value))
 * Returns an Iterable that skips elements while test is satisfied.
 * @description Checks that all first elements that satisfy test are removed, and
 * elements after that are retained.
 * @author kaigorodov
 */
import "dart:collection";
import "../../../Utils/expect.dart";
import "LinkedList.lib.dart";

void check(LinkedList<MyLinkedListEntry<int>> a0, bool test(var element)) {
  bool test2(MyLinkedListEntry<int> entry)=>test(entry.value);
  
  Iterator<MyLinkedListEntry<int>> it0=a0.iterator;
  Iterator<MyLinkedListEntry<int>> it=a0.skipWhile(test2).iterator;
  int skipCount=0;
  
  // skip manually
  bool hasNext0;
  while ((hasNext0=it0.moveNext()) && test2(it0.current)) {
    skipCount++;
  }

  // check that the rest of a0 is identical to a
  int len=0;
  for (;;) {
    bool hasNext=it.moveNext();
    Expect.equals(hasNext0, hasNext);
    if (!hasNext0) break;
    len++;
    Expect.equals(it0.current, it.current);
    hasNext0=it0.moveNext();
  }
  Expect.equals(a0.length-skipCount, len);
}

main() {
  LinkedList<MyLinkedListEntry<int>> a0=toLinkedList([1,3,7,4,5,6]);
  check(a0, (var element)=>element==1);
  check(a0, (var element)=>true);
  check(a0, (var element)=>false);
  check(a0, (var element)=>element>4);
  check(a0, (var element)=>element<4);
  check(a0, (var element)=>element==4);
}