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/DefaultIfEmpty.cs
+++ b/UnityProject/Packages/UniTask/Runtime/Linq/DefaultIfEmpty.cs
@@ -0,0 +1,142 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> DefaultIfEmpty<TSource>(this IUniTaskAsyncEnumerable<TSource> source)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            return new DefaultIfEmpty<TSource>(source, default);
+        }
+
+        public static IUniTaskAsyncEnumerable<TSource> DefaultIfEmpty<TSource>(this IUniTaskAsyncEnumerable<TSource> source, TSource defaultValue)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            return new DefaultIfEmpty<TSource>(source, defaultValue);
+        }
+    }
+
+    internal sealed class DefaultIfEmpty<TSource> : IUniTaskAsyncEnumerable<TSource>
+    {
+        readonly IUniTaskAsyncEnumerable<TSource> source;
+        readonly TSource defaultValue;
+
+        public DefaultIfEmpty(IUniTaskAsyncEnumerable<TSource> source, TSource defaultValue)
+        {
+            this.source = source;
+            this.defaultValue = defaultValue;
+        }
+
+        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            return new _DefaultIfEmpty(source, defaultValue, cancellationToken);
+        }
+
+        sealed class _DefaultIfEmpty : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
+        {
+            enum IteratingState : byte
+            {
+                Empty,
+                Iterating,
+                Completed
+            }
+
+            static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
+
+            readonly IUniTaskAsyncEnumerable<TSource> source;
+            readonly TSource defaultValue;
+            CancellationToken cancellationToken;
+
+            IteratingState iteratingState;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+
+            public _DefaultIfEmpty(IUniTaskAsyncEnumerable<TSource> source, TSource defaultValue, CancellationToken cancellationToken)
+            {
+                this.source = source;
+                this.defaultValue = defaultValue;
+                this.cancellationToken = cancellationToken;
+
+                this.iteratingState = IteratingState.Empty;
+                TaskTracker.TrackActiveTask(this, 3);
+            }
+
+            public TSource Current { get; private set; }
+
+
+            public UniTask<bool> MoveNextAsync()
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                completionSource.Reset();
+
+                if (iteratingState == IteratingState.Completed)
+                {
+                    return CompletedTasks.False;
+                }
+
+                if (enumerator == null)
+                {
+                    enumerator = source.GetAsyncEnumerator(cancellationToken);
+                }
+
+                awaiter = enumerator.MoveNextAsync().GetAwaiter();
+
+                if (awaiter.IsCompleted)
+                {
+                    MoveNextCore(this);
+                }
+                else
+                {
+                    awaiter.SourceOnCompleted(MoveNextCoreDelegate, this);
+                }
+
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            static void MoveNextCore(object state)
+            {
+                var self = (_DefaultIfEmpty)state;
+
+                if (self.TryGetResult(self.awaiter, out var result))
+                {
+                    if (result)
+                    {
+                        self.iteratingState = IteratingState.Iterating;
+                        self.Current = self.enumerator.Current;
+                        self.completionSource.TrySetResult(true);
+                    }
+                    else
+                    {
+                        if (self.iteratingState == IteratingState.Empty)
+                        {
+                            self.iteratingState = IteratingState.Completed;
+
+                            self.Current = self.defaultValue;
+                            self.completionSource.TrySetResult(true);
+                        }
+                        else
+                        {
+                            self.completionSource.TrySetResult(false);
+                        }
+                    }
+                }
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                if (enumerator != null)
+                {
+                    return enumerator.DisposeAsync();
+                }
+                return default;
+            }
+        }
+    }
+
+}