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feat: Enumerable.Consolidate extensions support predicates

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This commit is contained in:
Chris Cameron
2020-11-16 16:16:43 -05:00
parent 03be66983d
commit 37d5468e20
1 changed files with 66 additions and 27 deletions
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93
ICD.Common.Utils/Extensions/EnumerableExtensions.cs
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@@ -1542,20 +1542,20 @@ namespace ICD.Common.Utils.Extensions
return Consolidate(extends, EqualityComparer<T>.Default); return Consolidate(extends, EqualityComparer<T>.Default);
} }
/// <summary> /// <summary>
/// Skips duplicate, consecutive items. /// Skips duplicate, consecutive items.
/// E.g. /// E.g.
/// [1, 2, 2, 3, 1, 1] /// [1, 2, 2, 3, 1, 1]
/// Becomes /// Becomes
/// [1, 2, 3, 1] /// [1, 2, 3, 1]
/// </summary> /// </summary>
/// <typeparam name="T"></typeparam> /// <typeparam name="T"></typeparam>
/// <param name="extends"></param> /// <param name="extends"></param>
/// <param name="comparer"></param> /// <param name="comparer"></param>
/// <returns></returns> /// <returns></returns>
[PublicAPI] [PublicAPI]
public static IEnumerable<T> Consolidate<T>([NotNull] this IEnumerable<T> extends, public static IEnumerable<T> Consolidate<T>([NotNull] this IEnumerable<T> extends,
[NotNull] IEqualityComparer<T> comparer) [NotNull] IEqualityComparer<T> comparer)
{ {
if (extends == null) if (extends == null)
throw new ArgumentNullException("extends"); throw new ArgumentNullException("extends");
@@ -1563,33 +1563,72 @@ namespace ICD.Common.Utils.Extensions
if (comparer == null) if (comparer == null)
throw new ArgumentNullException("comparer"); throw new ArgumentNullException("comparer");
return ConsolidateIterator(extends, comparer); return extends.Consolidate(e => e, comparer);
} }
/// <summary> /// <summary>
/// Skips duplicate, consecutive items. /// Skips duplicate, consecutive items.
/// E.g. /// E.g.
/// [1, 2, 2, 3, 1, 1] /// [1, 2, 2, 3, 1, 1]
/// Becomes /// Becomes
/// [1, 2, 3, 1] /// [1, 2, 3, 1]
/// </summary> /// </summary>
/// <typeparam name="T"></typeparam> /// <typeparam name="TKey"></typeparam>
/// <param name="sequence"></param> /// <typeparam name="TValue"></typeparam>
/// <param name="extends"></param>
/// <param name="predicate"></param>
/// <returns></returns>
[PublicAPI]
public static IEnumerable<TKey> Consolidate<TKey, TValue>([NotNull] this IEnumerable<TKey> extends,
[NotNull] Func<TKey, TValue> predicate)
{
if (extends == null)
throw new ArgumentNullException("extends");
if (predicate == null)
throw new ArgumentNullException("predicate");
return extends.Consolidate(predicate, EqualityComparer<TValue>.Default);
}
/// <summary>
/// Skips duplicate, consecutive items.
/// E.g.
/// [1, 2, 2, 3, 1, 1]
/// Becomes
/// [1, 2, 3, 1]
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="extends"></param>
/// <param name="predicate"></param>
/// <param name="comparer"></param> /// <param name="comparer"></param>
/// <returns></returns> /// <returns></returns>
private static IEnumerable<T> ConsolidateIterator<T>([NotNull] IEnumerable<T> sequence, [PublicAPI]
[NotNull] IEqualityComparer<T> comparer) public static IEnumerable<TKey> Consolidate<TKey, TValue>([NotNull] this IEnumerable<TKey> extends,
[NotNull] Func<TKey, TValue> predicate,
[NotNull] IEqualityComparer<TValue> comparer)
{ {
bool first = true; if (extends == null)
T last = default(T); throw new ArgumentNullException("extends");
foreach (T item in sequence) if (predicate == null)
throw new ArgumentNullException("predicate");
if (comparer == null)
throw new ArgumentNullException("comparer");
bool first = true;
TValue last = default(TValue);
foreach (TKey item in extends)
{ {
if (!first && comparer.Equals(last, item)) TValue value = predicate(item);
if (!first && comparer.Equals(last, value))
continue; continue;
first = false; first = false;
last = item; last = value;
yield return item; yield return item;
} }