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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.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal class ConstKeywordRecommender : AbstractSyntacticSingleKeywordRecommender
{
private static readonly ISet<SyntaxKind> s_validModifiers = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.NewKeyword,
SyntaxKind.PublicKeyword,
SyntaxKind.ProtectedKeyword,
SyntaxKind.InternalKeyword,
SyntaxKind.PrivateKeyword,
};
private static readonly ISet<SyntaxKind> s_validGlobalModifiers = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.NewKeyword,
SyntaxKind.PublicKeyword,
SyntaxKind.InternalKeyword,
SyntaxKind.PrivateKeyword,
};
public ConstKeywordRecommender()
: base(SyntaxKind.ConstKeyword)
{
}
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
IsMemberDeclarationContext(context, cancellationToken) ||
IsLocalVariableDeclaration(context);
}
private static bool IsMemberDeclarationContext(CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
context.SyntaxTree.IsGlobalMemberDeclarationContext(context.Position, s_validGlobalModifiers, cancellationToken) ||
context.IsMemberDeclarationContext(
validModifiers: s_validModifiers,
validTypeDeclarations: SyntaxKindSet.ClassInterfaceStructRecordTypeDeclarations,
canBePartial: false,
cancellationToken: cancellationToken);
}
private static bool IsLocalVariableDeclaration(CSharpSyntaxContext context)
{
// cases:
// void Goo() {
// |
//
// |
return
context.IsStatementContext ||
context.IsGlobalStatementContext;
}
}
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