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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.Generic;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal sealed class FieldKeywordRecommender()
: AbstractSyntacticSingleKeywordRecommender(SyntaxKind.FieldKeyword)
{
// interfaces don't have members that you can put a [field:] attribute on
private static readonly ISet<SyntaxKind> s_validTypeDeclarations = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.StructDeclaration,
SyntaxKind.ClassDeclaration,
SyntaxKind.RecordDeclaration,
SyntaxKind.RecordStructDeclaration,
SyntaxKind.EnumDeclaration,
};
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
// `[field:` is legal in an attribute within a type.
if (context.IsMemberAttributeContext(s_validTypeDeclarations, includingRecordParameters: true, cancellationToken))
return true;
// Check if we're within a property accessor where the `field` keyword is legal. Note: we do not do a lang
// version check here. We do not want to interfere with users trying to use/learn this feature. The user will
// get a clear message if they're not on the right lang version telling them about the issue, and offering to
// upgrade their project if they way.
if (context.IsAnyExpressionContext || context.IsStatementContext)
{
if (!context.IsNameOfContext && IsInPropertyAccessor(context.TargetToken))
return true;
}
return false;
}
private static bool IsInPropertyAccessor(SyntaxToken targetToken)
{
for (var node = targetToken.Parent; node != null; node = node.Parent)
{
if (node is ArrowExpressionClauseSyntax { Parent: PropertyDeclarationSyntax })
return true;
if (node is AccessorDeclarationSyntax { Parent: AccessorListSyntax { Parent: PropertyDeclarationSyntax } })
return true;
}
return false;
}
}
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