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using System;
using System.Collections.Generic;
using System.Linq;
namespace Jellyfin.Extensions;
/// <summary>
/// Static extensions for the <see cref="IEnumerable{T}"/> interface.
/// </summary>
public static class EnumerableExtensions
{
/// <summary>
/// Determines whether the value is contained in the source collection.
/// </summary>
/// <param name="source">An instance of the <see cref="IEnumerable{String}"/> interface.</param>
/// <param name="value">The value to look for in the collection.</param>
/// <param name="stringComparison">The string comparison.</param>
/// <returns>A value indicating whether the value is contained in the collection.</returns>
/// <exception cref="ArgumentNullException">The source is null.</exception>
public static bool Contains(this IEnumerable<string> source, ReadOnlySpan<char> value, StringComparison stringComparison)
{
ArgumentNullException.ThrowIfNull(source);
if (source is IList<string> list)
{
int len = list.Count;
for (int i = 0; i < len; i++)
{
if (value.Equals(list[i], stringComparison))
{
return true;
}
}
return false;
}
foreach (string element in source)
{
if (value.Equals(element, stringComparison))
{
return true;
}
}
return false;
}
/// <summary>
/// Gets an IEnumerable from a single item.
/// </summary>
/// <param name="item">The item to return.</param>
/// <typeparam name="T">The type of item.</typeparam>
/// <returns>The IEnumerable{T}.</returns>
public static IEnumerable<T> SingleItemAsEnumerable<T>(this T item)
{
yield return item;
}
/// <summary>
/// Gets an IEnumerable consisting of all flags of an enum.
/// </summary>
/// <param name="flags">The flags enum.</param>
/// <typeparam name="T">The type of item.</typeparam>
/// <returns>The IEnumerable{Enum}.</returns>
public static IEnumerable<T> GetUniqueFlags<T>(this T flags)
where T : Enum
{
foreach (Enum value in Enum.GetValues(flags.GetType()))
{
if (flags.HasFlag(value))
{
yield return (T)value;
}
}
}
}
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