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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;
namespace Microsoft.CodeAnalysis.Shared.Extensions;
internal partial class ITypeSymbolExtensions
{
private class MinimalAccessibilityVisitor : SymbolVisitor<Accessibility>
{
public static readonly SymbolVisitor<Accessibility> Instance = new MinimalAccessibilityVisitor();
public override Accessibility DefaultVisit(ISymbol node)
=> throw new NotImplementedException();
public override Accessibility VisitAlias(IAliasSymbol symbol)
=> symbol.Target.Accept(this);
public override Accessibility VisitArrayType(IArrayTypeSymbol symbol)
=> symbol.ElementType.Accept(this);
public override Accessibility VisitDynamicType(IDynamicTypeSymbol symbol)
=> Accessibility.Public;
public override Accessibility VisitFunctionPointerType(IFunctionPointerTypeSymbol symbol)
{
var accessibility = symbol.DeclaredAccessibility;
accessibility = AccessibilityUtilities.Minimum(accessibility, symbol.Signature.ReturnType.Accept(this));
foreach (var parameter in symbol.Signature.Parameters)
{
accessibility = AccessibilityUtilities.Minimum(accessibility, parameter.Type.Accept(this));
}
// CallingConvention types are currently specced to always be public, but if that spec ever changes
// or the runtime creates special private types for it's own use, we'll be ready.
foreach (var callingConventionType in symbol.Signature.UnmanagedCallingConventionTypes)
{
accessibility = AccessibilityUtilities.Minimum(accessibility, callingConventionType.Accept(this));
}
return accessibility;
}
public override Accessibility VisitNamedType(INamedTypeSymbol symbol)
{
var accessibility = symbol.DeclaredAccessibility;
foreach (var arg in symbol.TypeArguments)
{
accessibility = AccessibilityUtilities.Minimum(accessibility, arg.Accept(this));
}
if (symbol.ContainingType != null)
{
accessibility = AccessibilityUtilities.Minimum(accessibility, symbol.ContainingType.Accept(this));
}
return accessibility;
}
public override Accessibility VisitPointerType(IPointerTypeSymbol symbol)
=> symbol.PointedAtType.Accept(this);
public override Accessibility VisitTypeParameter(ITypeParameterSymbol symbol)
{
// TODO(cyrusn): Do we have to consider the constraints?
return Accessibility.Public;
}
}
}
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