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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.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal class DefaultKeywordRecommender : AbstractSyntacticSingleKeywordRecommender
{
public DefaultKeywordRecommender()
: base(SyntaxKind.DefaultKeyword, isValidInPreprocessorContext: true)
{
}
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
IsValidPreProcessorContext(context) ||
context.IsStatementContext ||
context.IsGlobalStatementContext ||
context.IsAnyExpressionContext ||
context.TargetToken.IsSwitchLabelContext() ||
context.SyntaxTree.IsTypeParameterConstraintStartContext(position, context.LeftToken);
}
private static bool IsValidPreProcessorContext(CSharpSyntaxContext context)
{
// cases:
// #line |
// #line d|
// # line |
// # line d|
var previousToken1 = context.TargetToken;
var previousToken2 = previousToken1.GetPreviousToken(includeSkipped: true);
return
previousToken1.Kind() == SyntaxKind.LineKeyword &&
previousToken2.Kind() == SyntaxKind.HashToken;
}
}
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