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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;
using System.Composition;
using System.Threading;
using Microsoft.CodeAnalysis.BraceCompletion;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp.BraceCompletion;
[ExportBraceCompletionService(LanguageNames.CSharp), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class ParenthesisBraceCompletionService() : AbstractCSharpBraceCompletionService
{
protected override char OpeningBrace => Parenthesis.OpenCharacter;
protected override char ClosingBrace => Parenthesis.CloseCharacter;
public override bool AllowOverType(BraceCompletionContext context, CancellationToken cancellationToken)
=> AllowOverTypeInUserCodeWithValidClosingToken(context, cancellationToken);
protected override bool IsValidOpeningBraceToken(SyntaxToken token) => token.IsKind(SyntaxKind.OpenParenToken);
protected override bool IsValidClosingBraceToken(SyntaxToken token) => token.IsKind(SyntaxKind.CloseParenToken);
protected override bool IsValidOpenBraceTokenAtPosition(SourceText text, SyntaxToken token, int position)
{
if (ParentIsSkippedTokensTriviaOrNull(this.SyntaxFacts, token)
|| !IsValidOpeningBraceToken(token)
|| token.SpanStart != position
|| token.Parent == null)
{
return false;
}
// now check whether parser think whether there is already counterpart closing parenthesis
var (openParen, closeParen) = token.Parent.GetParentheses();
// We can complete the brace if the closing brace is missing or the incorrect kind.
if (closeParen.Kind() != SyntaxKind.CloseParenToken || closeParen.Span.Length == 0)
{
return true;
}
// If the completed pair is on the same line, then the closing parenthesis must belong to a different
// brace completion session higher up on the stack. If that's the case then we can
// complete the opening brace here, so return this as valid for completion.
return text.Lines.GetLineFromPosition(openParen.SpanStart).LineNumber == text.Lines.GetLineFromPosition(closeParen.Span.End).LineNumber;
}
}
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