' 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.
 
Imports System.Composition
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.BraceCompletion
Imports Microsoft.CodeAnalysis.Host.Mef
Imports Microsoft.CodeAnalysis.VisualBasic
 
Namespace Microsoft.CodeAnalysis.VisualBasic.BraceCompletion
    <ExportBraceCompletionService(LanguageNames.VisualBasic), [Shared]>
    Friend Class StringLiteralBraceCompletionService
        Inherits AbstractVisualBasicBraceCompletionService
 
        <ImportingConstructor>
        <Obsolete(MefConstruction.ImportingConstructorMessage, True)>
        Public Sub New()
            MyBase.New()
        End Sub
 
        Protected Overrides ReadOnly Property OpeningBrace As Char = DoubleQuote.OpenCharacter
        Protected Overrides ReadOnly Property ClosingBrace As Char = DoubleQuote.CloseCharacter
 
        Public Overrides Function AllowOverType(context As BraceCompletionContext, cancellationToken As CancellationToken) As Boolean
            Return AllowOverTypeWithValidClosingToken(context)
        End Function
 
        Public Overrides Function CanProvideBraceCompletion(brace As Char, openingPosition As Integer, document As ParsedDocument, cancellationToken As CancellationToken) As Boolean
            If OpeningBrace = brace And InterpolatedStringBraceCompletionService.IsPositionInInterpolatedStringContext(document, openingPosition) Then
                Return False
            End If
 
            Return MyBase.CanProvideBraceCompletion(brace, openingPosition, document, cancellationToken)
        End Function
 
        Protected Overrides Function IsValidOpeningBraceToken(token As SyntaxToken) As Boolean
            Return token.IsKind(SyntaxKind.StringLiteralToken)
        End Function
 
        Protected Overrides Function IsValidClosingBraceToken(token As SyntaxToken) As Boolean
            Return token.IsKind(SyntaxKind.StringLiteralToken)
        End Function
    End Class
End Namespace