|
' 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 "From" keyword when used in a New syntax (such as New goo From)
''' </summary>
Friend Class FromKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("From", VBFeaturesResources.Identifies_a_list_of_values_as_a_collection_initializer))
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
If targetToken.IsFollowingCompleteAsNewClause() OrElse
targetToken.IsFollowingCompleteObjectCreation() Then
Dim objectCreation = targetToken.GetAncestor(Of ObjectCreationExpressionSyntax)()
Dim type = TryCast(context.SemanticModel.GetSymbolInfo(objectCreation.Type, cancellationToken).Symbol, ITypeSymbol)
Dim enclosingSymbol = context.SemanticModel.GetEnclosingNamedTypeOrAssembly(context.Position, cancellationToken)
If type IsNot Nothing AndAlso type.CanSupportCollectionInitializer(enclosingSymbol) Then
Return s_keywords
End If
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
|