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Copy pathEnumerableHelpers.NetFramework.cs
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132 lines (104 loc) · 3.63 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.ClearScript.JavaScript;
namespace Microsoft.ClearScript.Util
{
/// <exclude/>
public interface IAsyncEnumeratorPromise<out T>
{
/// <exclude/>
T Current { get; }
/// <exclude/>
Task<bool> MoveNextAsync();
/// <exclude/>
Task DisposeAsync();
/// <exclude/>
object MoveNextPromise();
/// <exclude/>
object DisposePromise();
}
internal static partial class EnumerableHelpers
{
public static IAsyncEnumeratorPromise<T> ToAsyncEnumerator<T>(this IEnumerator<T> enumerator, ScriptEngine engine)
{
return new AsyncEnumeratorPromiseOnEnumerator<T>(engine, enumerator);
}
public static IAsyncEnumeratorPromise<object> ToAsyncEnumerator(this IEnumerator enumerator, ScriptEngine engine)
{
return new AsyncEnumeratorPromiseOnEnumerator(engine, enumerator);
}
public static IAsyncEnumeratorPromise<T> GetAsyncEnumerator<T>(IEnumerable<T> source, ScriptEngine engine)
{
return source.GetEnumerator().ToAsyncEnumerator(engine);
}
public static IAsyncEnumeratorPromise<object> GetAsyncEnumerator(IEnumerable source, ScriptEngine engine)
{
return source.GetEnumerator().ToAsyncEnumerator(engine);
}
}
internal abstract class AsyncEnumeratorPromiseBase
{
protected static readonly Task CompletedTask = Task.FromResult(0);
}
internal abstract class AsyncEnumeratorPromise<T> : AsyncEnumeratorPromiseBase, IAsyncEnumeratorPromise<T>
{
private readonly ScriptEngine engine;
protected AsyncEnumeratorPromise(ScriptEngine engine)
{
this.engine = engine;
}
public abstract T Current { get; }
public abstract Task<bool> MoveNextAsync();
public abstract Task DisposeAsync();
public object MoveNextPromise()
{
return MoveNextAsync().ToPromise(engine);
}
public object DisposePromise()
{
return DisposeAsync().ToPromise(engine);
}
}
internal sealed class AsyncEnumeratorPromiseOnEnumerator<T> : AsyncEnumeratorPromise<T>
{
private readonly IEnumerator<T> enumerator;
public AsyncEnumeratorPromiseOnEnumerator(ScriptEngine engine, IEnumerator<T> enumerator)
: base(engine)
{
this.enumerator = enumerator;
}
public override T Current => enumerator.Current;
public override Task<bool> MoveNextAsync()
{
return Task.FromResult(enumerator.MoveNext());
}
public override Task DisposeAsync()
{
enumerator.Dispose();
return CompletedTask;
}
}
internal sealed class AsyncEnumeratorPromiseOnEnumerator : AsyncEnumeratorPromise<object>
{
private readonly IEnumerator enumerator;
public AsyncEnumeratorPromiseOnEnumerator(ScriptEngine engine, IEnumerator enumerator)
: base(engine)
{
this.enumerator = enumerator;
}
public override object Current => enumerator.Current;
public override Task<bool> MoveNextAsync()
{
return Task.FromResult(enumerator.MoveNext());
}
public override Task DisposeAsync()
{
(enumerator as IDisposable)?.Dispose();
return CompletedTask;
}
}
}