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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;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal sealed class ScopedKeywordRecommender() : AbstractSyntacticSingleKeywordRecommender(SyntaxKind.ScopedKeyword)
{
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
var syntaxTree = context.SyntaxTree;
return
syntaxTree.IsParameterModifierContext(position, context.LeftToken, includeOperators: true, out _, out _) ||
syntaxTree.IsAnonymousMethodParameterModifierContext(position, context.LeftToken) ||
syntaxTree.IsPossibleLambdaParameterModifierContext(position, context.LeftToken, cancellationToken) ||
IsValidScopedLocalContext(context);
}
private static bool IsValidScopedLocalContext(CSharpSyntaxContext context)
{
// scoped ref var x ...
if (context.IsStatementContext || context.IsGlobalStatementContext)
{
return true;
}
var token = context.TargetToken;
switch (token.Kind())
{
// for (scoped ref var x ...
// foreach (scoped ...
case SyntaxKind.OpenParenToken:
var previous = token.GetPreviousToken(includeSkipped: true);
return previous.Kind() is SyntaxKind.ForKeyword or SyntaxKind.ForEachKeyword;
// M(out scoped ..)
case SyntaxKind.OutKeyword:
return token.Parent is ArgumentSyntax;
}
return false;
}
}
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