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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.Immutable;
using System.Threading;
using Microsoft.CodeAnalysis.Completion.Providers;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal class DynamicKeywordRecommender : IKeywordRecommender<CSharpSyntaxContext>
{
private static bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
if (context.IsPreProcessorDirectiveContext ||
context.IsTaskLikeTypeContext)
{
return false;
}
return IsDynamicTypeContext(position, context, cancellationToken);
}
public ImmutableArray<RecommendedKeyword> RecommendKeywords(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return IsValidContext(position, context, cancellationToken)
? [new RecommendedKeyword("dynamic")]
: [];
}
protected static bool IsDynamicTypeContext(
int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
var syntaxTree = context.SyntaxTree;
// first do quick exit check
if (syntaxTree.IsDefinitelyNotTypeContext(position, cancellationToken))
{
return false;
}
return
context.IsStatementContext ||
context.IsGlobalStatementContext ||
context.IsDefiniteCastTypeContext ||
syntaxTree.IsPossibleCastTypeContext(position, context.LeftToken, cancellationToken) ||
context.IsObjectCreationTypeContext ||
context.IsGenericTypeArgumentContext ||
context.IsFunctionPointerTypeArgumentContext ||
context.IsIsOrAsTypeContext ||
syntaxTree.IsDefaultExpressionContext(position, context.LeftToken) ||
syntaxTree.IsAfterKeyword(position, SyntaxKind.ConstKeyword, cancellationToken) ||
IsAfterRefTypeContext(context) ||
context.IsLocalVariableDeclarationContext ||
context.IsParameterTypeContext ||
context.IsPossibleLambdaOrAnonymousMethodParameterTypeContext ||
context.IsDelegateReturnTypeContext ||
context.IsUsingAliasTypeContext ||
context.IsPossibleTupleContext ||
syntaxTree.IsGlobalMemberDeclarationContext(position, SyntaxKindSet.AllGlobalMemberModifiers, cancellationToken) ||
context.IsMemberDeclarationContext(
validModifiers: SyntaxKindSet.AllMemberModifiers,
validTypeDeclarations: SyntaxKindSet.ClassInterfaceStructRecordTypeDeclarations,
canBePartial: false,
cancellationToken: cancellationToken);
}
private static bool IsAfterRefTypeContext(CSharpSyntaxContext context)
=> context.TargetToken.Kind() is SyntaxKind.RefKeyword or SyntaxKind.ReadOnlyKeyword &&
context.TargetToken.Parent.IsKind(SyntaxKind.RefType);
}
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