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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;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal sealed class DelegateKeywordRecommender() : AbstractSyntacticSingleKeywordRecommender(SyntaxKind.DelegateKeyword)
{
private static readonly ISet<SyntaxKind> s_validModifiers = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.InternalKeyword,
SyntaxKind.PublicKeyword,
SyntaxKind.PrivateKeyword,
SyntaxKind.ProtectedKeyword,
SyntaxKind.UnsafeKeyword
};
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
if (context.IsGlobalStatementContext ||
context.IsUsingAliasTypeContext ||
IsAfterAsyncKeywordInExpressionContext(context, cancellationToken) ||
context.IsTypeDeclarationContext(
validModifiers: s_validModifiers,
validTypeDeclarations: SyntaxKindSet.ClassInterfaceStructRecordTypeDeclarations,
canBePartial: false,
cancellationToken: cancellationToken))
{
return true;
}
// now look for places that a function pointer could go `delegate*...`
if (context.IsNonAttributeExpressionContext || context.IsTypeContext)
{
if (context.IsConstantExpressionContext)
return false;
if (context.SyntaxTree.IsUsingStaticContext(position, cancellationToken))
return false;
if (context.IsAttributeNameContext)
return false;
return true;
}
return false;
}
private static bool IsAfterAsyncKeywordInExpressionContext(CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
context.TargetToken.IsKindOrHasMatchingText(SyntaxKind.AsyncKeyword) &&
context.SyntaxTree.IsExpressionContext(
context.TargetToken.SpanStart,
context.TargetToken,
attributes: false,
cancellationToken: cancellationToken,
semanticModel: context.SemanticModel);
}
}
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