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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.Collections.Immutable
Imports System.Threading
Imports Microsoft.CodeAnalysis.Completion.Providers
Imports Microsoft.CodeAnalysis.VisualBasic.Extensions.ContextQuery
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
Namespace Microsoft.CodeAnalysis.VisualBasic.Completion.KeywordRecommenders.Expressions
''' <summary>
''' Recommends the "Key" keyword.
''' </summary>
Friend Class KeyKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("Key", VBFeaturesResources.Identifies_a_key_field_in_an_anonymous_type_definition))
Protected Overrides Function RecommendKeywords(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As ImmutableArray(Of RecommendedKeyword)
If context.FollowsEndOfStatement Then
Return ImmutableArray(Of RecommendedKeyword).Empty
End If
Dim targetToken = context.TargetToken
' Key can only come after a { or a , in a initializer
If targetToken.IsKind(SyntaxKind.OpenBraceToken, SyntaxKind.CommaToken) AndAlso
targetToken.Parent.IsKind(SyntaxKind.ObjectMemberInitializer) Then
' We might be in an expression...
If targetToken.Parent.GetParentOrNull().IsKind(SyntaxKind.AnonymousObjectCreationExpression) Then
Return s_keywords
End If
' Or we might be in an AsNew. In this case, we need to check to make sure the type is correct
If targetToken.Parent.GetParentOrNull().GetParentOrNull().IsKind(SyntaxKind.AsNewClause) Then
Dim asNewClause = DirectCast(targetToken.Parent.Parent.Parent, AsNewClauseSyntax)
If asNewClause.Type.IsMissing Then
Return s_keywords
End If
End If
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
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