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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.
Imports System.Composition
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.BraceCompletion
Imports Microsoft.CodeAnalysis.Host.Mef
Imports Microsoft.CodeAnalysis.Text
Imports Microsoft.CodeAnalysis.VisualBasic
Namespace Microsoft.CodeAnalysis.VisualBasic.BraceCompletion
<ExportBraceCompletionService(LanguageNames.VisualBasic), [Shared]>
Friend Class InterpolationBraceCompletionService
Inherits AbstractVisualBasicBraceCompletionService
<ImportingConstructor>
<Obsolete(MefConstruction.ImportingConstructorMessage, True)>
Public Sub New()
MyBase.New()
End Sub
Protected Overrides ReadOnly Property OpeningBrace As Char = CurlyBrace.OpenCharacter
Protected Overrides ReadOnly Property ClosingBrace As Char = CurlyBrace.CloseCharacter
Protected Overrides Function IsValidOpenBraceTokenAtPosition(text As SourceText, token As SyntaxToken, position As Integer) As Boolean
Return IsValidOpeningBraceToken(token)
End Function
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
Return OpeningBrace = brace And IsPositionInInterpolationContext(document, openingPosition)
End Function
Protected Overrides Function IsValidOpeningBraceToken(token As SyntaxToken) As Boolean
Return token.IsKind(SyntaxKind.DollarSignDoubleQuoteToken, SyntaxKind.InterpolatedStringTextToken) OrElse
(token.IsKind(SyntaxKind.CloseBraceToken) AndAlso token.Parent.IsKind(SyntaxKind.Interpolation))
End Function
Protected Overrides Function IsValidClosingBraceToken(token As SyntaxToken) As Boolean
Return token.IsKind(SyntaxKind.CloseBraceToken)
End Function
Public Shared Function IsPositionInInterpolationContext(document As ParsedDocument, position As Integer) As Boolean
If position = 0 Then
Return False
End If
' First, check to see if the character to the left of the position is an open curly.
' If it is, we shouldn't complete because the user may be trying to escape a curly.
' E.g. they are trying to type $"{{"
If CouldEscapePreviousOpenBrace("{"c, position, document.Text) Then
Return False
End If
' Next, check to see if the token we're typing is part of an existing interpolated string.
'
Dim token = document.Root.FindTokenOnRightOfPosition(position)
If Not token.Span.IntersectsWith(position) Then
Return False
End If
Return token.IsKind(SyntaxKind.DollarSignDoubleQuoteToken, SyntaxKind.InterpolatedStringTextToken) OrElse
(token.IsKind(SyntaxKind.CloseBraceToken) AndAlso token.Parent.IsKind(SyntaxKind.Interpolation))
End Function
End Class
End Namespace
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