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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.SpellCheck;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.LanguageServer.Handler.SpellCheck;
internal record struct SpellCheckState(ISpellCheckSpanService Service, Document Document);
/// <summary>
/// Simplified version of <see cref="VersionedPullCache{TCheapVersion, TExpensiveVersion, TState, TComputedData}"/> that only uses a
/// single cheap key to check results against.
/// </summary>
internal sealed class SpellCheckPullCache(string uniqueKey) : VersionedPullCache<(Checksum parseOptionsChecksum, Checksum textChecksum)?, object?, SpellCheckState, ImmutableArray<SpellCheckSpan>>(uniqueKey)
{
public override async Task<(Checksum parseOptionsChecksum, Checksum textChecksum)?> ComputeCheapVersionAsync(SpellCheckState state, CancellationToken cancellationToken)
{
var project = state.Document.Project;
var parseOptionsChecksum = project.State.GetParseOptionsChecksum();
var documentChecksumState = await state.Document.State.GetStateChecksumsAsync(cancellationToken).ConfigureAwait(false);
var textChecksum = documentChecksumState.Text;
return (parseOptionsChecksum, textChecksum);
}
public override Checksum ComputeChecksum(ImmutableArray<SpellCheckSpan> data)
{
var checksums = data.SelectAsArray(s => Checksum.Create(s, SerializeSpellCheckSpan)).Sort();
return Checksum.Create(checksums);
}
public override async Task<ImmutableArray<SpellCheckSpan>> ComputeDataAsync(SpellCheckState state, CancellationToken cancellationToken)
{
var spans = await state.Service.GetSpansAsync(state.Document, cancellationToken).ConfigureAwait(false);
return spans;
}
public override Task<object?> ComputeExpensiveVersionAsync(SpellCheckState state, CancellationToken cancellationToken)
{
// Spell check does not need an expensive version check - we return null to effectively skip this check.
return SpecializedTasks.Null<object>();
}
private void SerializeSpellCheckSpan(SpellCheckSpan span, ObjectWriter writer)
{
writer.WriteInt32(span.TextSpan.Start);
writer.WriteInt32(span.TextSpan.Length);
writer.WriteInt32((int)span.Kind);
}
}
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