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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 Microsoft.CodeAnalysis.ErrorReporting;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Runtime.Serialization.Json;
using System.Text;
using System;
using Microsoft.CodeAnalysis.Diagnostics;
using System.Diagnostics.CodeAnalysis;
namespace Microsoft.CodeAnalysis.LanguageServer.Features.Diagnostics;
internal static class DiagnosticDataExtensions
{
internal static bool TryGetUnnecessaryDataLocations(this DiagnosticData diagnosticData, [NotNullWhen(true)] out ImmutableArray<DiagnosticDataLocation>? unnecessaryLocations)
{
// If there are 'unnecessary' locations specified in the property bag, use those instead of the main diagnostic location.
if (diagnosticData.TryGetUnnecessaryLocationIndices(out var unnecessaryIndices))
{
using var _ = PooledObjects.ArrayBuilder<DiagnosticDataLocation>.GetInstance(out var locationsToTag);
foreach (var index in GetLocationIndices(unnecessaryIndices))
locationsToTag.Add(diagnosticData.AdditionalLocations[index]);
unnecessaryLocations = locationsToTag.ToImmutable();
return true;
}
unnecessaryLocations = null;
return false;
static IEnumerable<int> GetLocationIndices(string indicesProperty)
{
try
{
using var stream = new MemoryStream(Encoding.UTF8.GetBytes(indicesProperty));
var serializer = new DataContractJsonSerializer(typeof(IEnumerable<int>));
var result = serializer.ReadObject(stream) as IEnumerable<int>;
return result ?? [];
}
catch (Exception e) when (FatalError.ReportAndCatch(e))
{
return [];
}
}
}
internal static bool TryGetUnnecessaryLocationIndices(
this DiagnosticData diagnosticData, [NotNullWhen(true)] out string? unnecessaryIndices)
{
unnecessaryIndices = null;
return diagnosticData.AdditionalLocations.Length > 0
&& diagnosticData.Properties != null
&& diagnosticData.Properties.TryGetValue(WellKnownDiagnosticTags.Unnecessary, out unnecessaryIndices)
&& unnecessaryIndices != null;
}
}
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