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71 lines
2.2 KiB
C#
71 lines
2.2 KiB
C#
// Kyoo - A portable and vast media library solution.
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// Copyright (c) Kyoo.
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//
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// See AUTHORS.md and LICENSE file in the project root for full license information.
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//
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// Kyoo is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// any later version.
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//
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// Kyoo is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
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using System;
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using System.Collections.Generic;
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namespace Kyoo.Utils;
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/// <summary>
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/// A set of extensions class for enumerable.
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/// </summary>
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public static class EnumerableExtensions
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{
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/// <summary>
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/// If the enumerable is empty, execute an action.
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/// </summary>
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/// <param name="self">The enumerable to check</param>
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/// <param name="action">The action to execute is the list is empty</param>
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/// <typeparam name="T">The type of items inside the list</typeparam>
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/// <returns>The iterator proxied, there is no dual iterations.</returns>
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public static IEnumerable<T> IfEmpty<T>(this IEnumerable<T> self, Action action)
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{
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static IEnumerable<T> Generator(IEnumerable<T> self, Action action)
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{
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using IEnumerator<T> enumerator = self.GetEnumerator();
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if (!enumerator.MoveNext())
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{
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action();
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yield break;
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}
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do
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{
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yield return enumerator.Current;
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} while (enumerator.MoveNext());
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}
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return Generator(self, action);
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}
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/// <summary>
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/// A foreach used as a function with a little specificity: the list can be null.
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/// </summary>
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/// <param name="self">The list to enumerate. If this is null, the function result in a no-op</param>
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/// <param name="action">The action to execute for each arguments</param>
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/// <typeparam name="T">The type of items in the list</typeparam>
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public static void ForEach<T>(this IEnumerable<T>? self, Action<T> action)
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{
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if (self == null)
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return;
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foreach (T i in self)
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action(i);
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}
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}
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