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115 changes: 115 additions & 0 deletions
115
src/ApiCompat/Microsoft.DotNet.ApiCompatibility/Rules/CannotChangeVisibility.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // Copyright (c) .NET Foundation and contributors. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Runtime; | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.DotNet.ApiCompatibility.Abstractions; | ||
| using Microsoft.DotNet.ApiCompatibility.Extensions; | ||
|
|
||
| namespace Microsoft.DotNet.ApiCompatibility.Rules | ||
| { | ||
| /// <summary> | ||
| /// This class implements a rule to check that the visibility of symbols is not reduced. | ||
| /// In strict mode, it also checks that the visibility isn't expanded. | ||
| /// </summary> | ||
| public class CannotChangeVisibility : IRule | ||
| { | ||
| private readonly RuleSettings _settings; | ||
|
|
||
| public CannotChangeVisibility(RuleSettings settings, IRuleRegistrationContext context) | ||
| { | ||
| _settings = settings; | ||
| context.RegisterOnMemberSymbolAction(RunOnMemberSymbol); | ||
| context.RegisterOnTypeSymbolAction(RunOnTypeSymbol); | ||
| } | ||
|
|
||
| private static Accessibility NormalizeInternals(Accessibility a) => a switch | ||
| { | ||
| Accessibility.ProtectedOrInternal => Accessibility.Protected, | ||
| Accessibility.ProtectedAndInternal or Accessibility.Internal => Accessibility.Private, | ||
| _ => a, | ||
| }; | ||
|
|
||
| private int CompareAccessibility(Accessibility a, Accessibility b) | ||
| { | ||
| if (!_settings.IncludeInternalSymbols) | ||
| { | ||
| a = NormalizeInternals(a); | ||
| b = NormalizeInternals(b); | ||
| } | ||
|
|
||
| if (a == b) | ||
| { | ||
| return 0; | ||
| } | ||
|
|
||
| return (a, b) switch | ||
| { | ||
| (Accessibility.Public, _) => 1, | ||
| (_, Accessibility.Public) => -1, | ||
| (Accessibility.ProtectedOrInternal, _) => 1, | ||
| (_, Accessibility.ProtectedOrInternal) => -1, | ||
| (Accessibility.Protected or Accessibility.Internal, _) => 1, | ||
| (_, Accessibility.Protected or Accessibility.Internal) => -1, | ||
| (Accessibility.ProtectedAndInternal, _) => 1, | ||
| (_, Accessibility.ProtectedAndInternal) => -1, | ||
| _ => throw new NotImplementedException(), | ||
| }; | ||
| } | ||
|
|
||
| private void RunOnSymbol( | ||
| ISymbol? left, | ||
| ISymbol? right, | ||
| MetadataInformation leftMetadata, | ||
| MetadataInformation rightMetadata, | ||
| IList<CompatDifference> differences) | ||
| { | ||
| // The MemberMustExist rule handles missing symbols and therefore this rule only runs when left and right is not null. | ||
| if (left is null || right is null) | ||
| { | ||
| return; | ||
| } | ||
|
|
||
| Accessibility leftAccess = left.DeclaredAccessibility; | ||
| Accessibility rightAccess = right.DeclaredAccessibility; | ||
| int accessComparison = CompareAccessibility(leftAccess, rightAccess); | ||
|
|
||
| if (accessComparison > 0) | ||
| { | ||
| differences.Add(new CompatDifference(leftMetadata, | ||
| rightMetadata, | ||
| DiagnosticIds.CannotReduceVisibility, | ||
| string.Format(Resources.CannotReduceVisibility, left, leftAccess, rightAccess), | ||
| DifferenceType.Changed, | ||
| left)); | ||
| } | ||
| else if (_settings.StrictMode && accessComparison < 0) | ||
| { | ||
| differences.Add(new CompatDifference(leftMetadata, | ||
| rightMetadata, | ||
| DiagnosticIds.CannotExpandVisibility, | ||
| string.Format(Resources.CannotExpandVisibility, right, leftAccess, rightAccess), | ||
| DifferenceType.Changed, | ||
| right)); | ||
| } | ||
| } | ||
|
|
||
| private void RunOnTypeSymbol( | ||
| ITypeSymbol? left, | ||
| ITypeSymbol? right, | ||
| MetadataInformation leftMetadata, | ||
| MetadataInformation rightMetadata, | ||
| IList<CompatDifference> differences) => RunOnSymbol(left, right, leftMetadata, rightMetadata, differences); | ||
|
|
||
| private void RunOnMemberSymbol( | ||
| ISymbol? left, | ||
| ISymbol? right, | ||
| ITypeSymbol leftContainingType, | ||
| ITypeSymbol rightContainingType, | ||
| MetadataInformation leftMetadata, | ||
| MetadataInformation rightMetadata, | ||
| IList<CompatDifference> differences) => RunOnSymbol(left, right, leftMetadata, rightMetadata, differences); | ||
| } | ||
| } |
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