更新Demo

2025-08-14 16:51:28 +00:00 · 2023-12-20 12:14:27 +08:00
parent f64bb37706
commit 17a5d7425c
847 changed files with 106095 additions and 0 deletions
--- a/UnityProject/Packages/UniTask/Runtime/Linq/SkipLast.cs
+++ b/UnityProject/Packages/UniTask/Runtime/Linq/SkipLast.cs
@@ -0,0 +1,159 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> SkipLast<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Int32 count)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            // non skip.
+            if (count <= 0)
+            {
+                return source;
+            }
+
+            return new SkipLast<TSource>(source, count);
+        }
+    }
+
+    internal sealed class SkipLast<TSource> : IUniTaskAsyncEnumerable<TSource>
+    {
+        readonly IUniTaskAsyncEnumerable<TSource> source;
+        readonly int count;
+
+        public SkipLast(IUniTaskAsyncEnumerable<TSource> source, int count)
+        {
+            this.source = source;
+            this.count = count;
+        }
+
+        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            return new _SkipLast(source, count, cancellationToken);
+        }
+
+        sealed class _SkipLast : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
+        {
+            static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
+
+            readonly IUniTaskAsyncEnumerable<TSource> source;
+            readonly int count;
+            CancellationToken cancellationToken;
+
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Queue<TSource> queue;
+
+            bool continueNext;
+
+            public _SkipLast(IUniTaskAsyncEnumerable<TSource> source, int count, CancellationToken cancellationToken)
+            {
+                this.source = source;
+                this.count = count;
+                this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
+            }
+
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+
+                if (enumerator == null)
+                {
+                    enumerator = source.GetAsyncEnumerator(cancellationToken);
+                    queue = new Queue<TSource>();
+                }
+
+                completionSource.Reset();
+                SourceMoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void SourceMoveNext()
+            {
+                try
+                {
+
+                    LOOP:
+                    awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                    if (awaiter.IsCompleted)
+                    {
+                        continueNext = true;
+                        MoveNextCore(this);
+                        if (continueNext)
+                        {
+                            continueNext = false;
+                            goto LOOP; // avoid recursive
+                        }
+                    }
+                    else
+                    {
+                        awaiter.SourceOnCompleted(MoveNextCoreDelegate, this);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    completionSource.TrySetException(ex);
+                }
+            }
+
+
+            static void MoveNextCore(object state)
+            {
+                var self = (_SkipLast)state;
+
+                if (self.TryGetResult(self.awaiter, out var result))
+                {
+                    if (result)
+                    {
+                        if (self.queue.Count == self.count)
+                        {
+                            self.continueNext = false;
+
+                            var deq = self.queue.Dequeue();
+                            self.Current = deq;
+                            self.queue.Enqueue(self.enumerator.Current);
+
+                            self.completionSource.TrySetResult(true);
+                        }
+                        else
+                        {
+                            self.queue.Enqueue(self.enumerator.Current);
+
+                            if (!self.continueNext)
+                            {
+                                self.SourceMoveNext();
+                            }
+                        }
+                    }
+                    else
+                    {
+                        self.continueNext = false;
+                        self.completionSource.TrySetResult(false);
+                    }
+                }
+                else
+                {
+                    self.continueNext = false;
+                }
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                if (enumerator != null)
+                {
+                    return enumerator.DisposeAsync();
+                }
+                return default;
+            }
+        }
+    }
+}