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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.Text;
namespace Microsoft.CodeAnalysis.Host;
internal static class SpanMappingHelper
{
public static bool CanMapSpans(Document document)
{
if (document is SourceGeneratedDocument sourceGeneratedDocument &&
document.Project.Solution.Services.GetService<ISourceGeneratedDocumentSpanMappingService>() is { } sourceGeneratedSpanMappingService)
{
return sourceGeneratedSpanMappingService.CanMapSpans(sourceGeneratedDocument);
}
return document.DocumentServiceProvider.GetService<ISpanMappingService>() is not null;
}
public static async Task<ImmutableArray<MappedSpanResult>?> TryGetMappedSpanResultAsync(Document document, ImmutableArray<TextSpan> textSpans, CancellationToken cancellationToken)
{
if (document is SourceGeneratedDocument sourceGeneratedDocument &&
document.Project.Solution.Services.GetService<ISourceGeneratedDocumentSpanMappingService>() is { } sourceGeneratedSpanMappingService)
{
var result = await sourceGeneratedSpanMappingService.MapSpansAsync(sourceGeneratedDocument, textSpans, cancellationToken).ConfigureAwait(false);
if (result.IsDefaultOrEmpty)
{
return null;
}
Contract.ThrowIfFalse(textSpans.Length == result.Length,
$"The number of input spans {textSpans.Length} should match the number of mapped spans returned {result.Length}");
return result;
}
var spanMappingService = document.DocumentServiceProvider.GetService<ISpanMappingService>();
if (spanMappingService == null)
{
return null;
}
var mappedSpanResult = await spanMappingService.MapSpansAsync(document, textSpans, cancellationToken).ConfigureAwait(false);
Contract.ThrowIfFalse(textSpans.Length == mappedSpanResult.Length,
$"The number of input spans {textSpans.Length} should match the number of mapped spans returned {mappedSpanResult.Length}");
return mappedSpanResult;
}
}
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