106 lines
3.4 KiB
C#
106 lines
3.4 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal sealed class Scan<TSource, TAccumulate> : Producer<TAccumulate, Scan<TSource, TAccumulate>._>
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{
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private readonly IObservable<TSource> _source;
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private readonly TAccumulate _seed;
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private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
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public Scan(IObservable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator)
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{
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_source = source;
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_seed = seed;
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_accumulator = accumulator;
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}
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protected override _ CreateSink(IObserver<TAccumulate> observer) => new(this, observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : Sink<TSource, TAccumulate>
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{
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private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
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private TAccumulate _accumulation;
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public _(Scan<TSource, TAccumulate> parent, IObserver<TAccumulate> observer)
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: base(observer)
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{
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_accumulator = parent._accumulator;
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_accumulation = parent._seed;
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}
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public override void OnNext(TSource value)
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{
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try
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{
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_accumulation = _accumulator(_accumulation, value);
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}
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catch (Exception exception)
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{
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ForwardOnError(exception);
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return;
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}
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ForwardOnNext(_accumulation);
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}
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}
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}
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internal sealed class Scan<TSource> : Producer<TSource, Scan<TSource>._>
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{
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private readonly IObservable<TSource> _source;
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private readonly Func<TSource, TSource, TSource> _accumulator;
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public Scan(IObservable<TSource> source, Func<TSource, TSource, TSource> accumulator)
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{
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_source = source;
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_accumulator = accumulator;
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}
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protected override _ CreateSink(IObserver<TSource> observer) => new(_accumulator, observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : IdentitySink<TSource>
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{
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private readonly Func<TSource, TSource, TSource> _accumulator;
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private TSource? _accumulation;
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private bool _hasAccumulation;
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public _(Func<TSource, TSource, TSource> accumulator, IObserver<TSource> observer)
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: base(observer)
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{
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_accumulator = accumulator;
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}
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public override void OnNext(TSource value)
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{
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try
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{
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if (_hasAccumulation)
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{
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_accumulation = _accumulator(_accumulation!, value);
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}
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else
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{
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_accumulation = value;
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_hasAccumulation = true;
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}
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}
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catch (Exception exception)
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{
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ForwardOnError(exception);
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return;
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}
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ForwardOnNext(_accumulation);
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}
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}
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}
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}
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