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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;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
internal class BaseKeywordRecommender : AbstractSyntacticSingleKeywordRecommender
{
public BaseKeywordRecommender()
: base(SyntaxKind.BaseKeyword)
{
}
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
// We need to at least be in a type declaration context. This prevents us from showing
// calls to 'base' in things like top level repl statements and whatnot.
if (context.ContainingTypeDeclaration != null)
{
return
IsConstructorInitializerContext(context) ||
IsInstanceExpressionOrStatement(context);
}
return false;
}
private static bool IsInstanceExpressionOrStatement(CSharpSyntaxContext context)
{
if (context.IsInstanceContext)
{
return context.IsNonAttributeExpressionContext || context.IsStatementContext;
}
return false;
}
private static bool IsConstructorInitializerContext(CSharpSyntaxContext context)
{
// cases:
// Goo() : |
var token = context.TargetToken;
if (token.Kind() == SyntaxKind.ColonToken &&
token.Parent is ConstructorInitializerSyntax &&
token.Parent.IsParentKind(SyntaxKind.ConstructorDeclaration) &&
token.Parent.Parent?.Parent is (kind: SyntaxKind.ClassDeclaration or SyntaxKind.RecordDeclaration))
{
var constructor = token.GetRequiredAncestor<ConstructorDeclarationSyntax>();
if (constructor.Modifiers.Any(SyntaxKind.StaticKeyword))
{
return false;
}
return true;
}
return false;
}
}
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