// 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.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.Shared.Extensions;

namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;

internal sealed class UndefKeywordRecommender() : AbstractSyntacticSingleKeywordRecommender(SyntaxKind.UndefKeyword, isValidInPreprocessorContext: true)
{
    protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
    {
        var syntaxTree = context.SyntaxTree;
        return
            context.IsPreProcessorKeywordContext &&
            syntaxTree.IsBeforeFirstToken(position, cancellationToken);
    }
}