private static IEnumerable<Diagnostic> GetEffectiveDiagnosticsImpl(ImmutableArray<Diagnostic> diagnostics, Compilation compilation)
{
var suppressMessageState = new SuppressMessageAttributeState(compilation);
foreach (var diagnostic in diagnostics)
{
if (diagnostic != null)
{
var effectiveDiagnostic = compilation.Options.FilterDiagnostic(diagnostic);
if (effectiveDiagnostic != null)
{
yield return suppressMessageState.ApplySourceSuppressions(effectiveDiagnostic);
}
}
}
}
/// <summary>
/// Given a set of compiler or <see cref="DiagnosticAnalyzer"/> generated <paramref name="diagnostics"/>, returns the effective diagnostics after applying the below filters:
/// 1) <see cref="CompilationOptions.SpecificDiagnosticOptions"/> specified for the given <paramref name="compilation"/>.
/// 2) <see cref="CompilationOptions.GeneralDiagnosticOption"/> specified for the given <paramref name="compilation"/>.
/// 3) Diagnostic suppression through applied <see cref="System.Diagnostics.CodeAnalysis.SuppressMessageAttribute"/>.
/// 4) Pragma directives for the given <paramref name="compilation"/>.
/// </summary>
public static IEnumerable<Diagnostic> GetEffectiveDiagnostics(IEnumerable<Diagnostic> diagnostics, Compilation compilation)
{
if (diagnostics == null)
{
throw new ArgumentNullException(nameof(diagnostics));
}
if (compilation == null)
{
throw new ArgumentNullException(nameof(compilation));
}
var suppressMessageState = new SuppressMessageAttributeState(compilation);
foreach (var diagnostic in diagnostics.ToImmutableArray())
{
if (diagnostic != null)
{
var effectiveDiagnostic = compilation.Options.FilterDiagnostic(diagnostic);
if (effectiveDiagnostic != null)
{
effectiveDiagnostic = suppressMessageState.ApplySourceSuppressions(effectiveDiagnostic);
yield return effectiveDiagnostic;
}
}
}
}
private ImmutableArray<Diagnostic> FilterDiagnosticsSuppressedInSource(ImmutableArray<Diagnostic> diagnostics, Compilation compilation, SuppressMessageAttributeState suppressMessageState)
{
if (diagnostics.IsEmpty)
{
return diagnostics;
}
var reportSuppressedDiagnostics = compilation.Options.ReportSuppressedDiagnostics;
var builder = ImmutableArray.CreateBuilder<Diagnostic>();
for (var i = 0; i < diagnostics.Length; i++)
{
#if DEBUG
// We should have ignored diagnostics with invalid locations and reported analyzer exception diagnostic for the same.
DiagnosticAnalysisContextHelpers.VerifyDiagnosticLocationsInCompilation(diagnostics[i], compilation);
#endif
var diagnostic = suppressMessageState.ApplySourceSuppressions(diagnostics[i]);
if (!reportSuppressedDiagnostics && diagnostic.IsSuppressed)
{
// Diagnostic suppressed in source.
continue;
}
builder.Add(diagnostic);
}
return builder.ToImmutable();
}
