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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.Queries
''' <summary>
''' Recommends the "Join" keyword.
''' </summary>
Friend Class JoinKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("Join", VBFeaturesResources.Combines_the_elements_of_two_sequences_The_join_operation_is_based_on_matching_keys))
Protected Overrides Function RecommendKeywords(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As ImmutableArray(Of RecommendedKeyword)
' First there is the normal and boring "Join"
If context.IsQueryOperatorContext OrElse context.IsAdditionalJoinOperatorContext(cancellationToken) Then
Return s_keywords
End If
' Now this might be Group Join...
Dim targetToken = context.TargetToken
' If it's just "Group" it may have parsed as a Group By
Return If(targetToken.IsChildToken(Of GroupByClauseSyntax)(Function(groupBy) groupBy.GroupKeyword) OrElse targetToken.IsChildToken(Of GroupJoinClauseSyntax)(Function(groupBy) groupBy.GroupKeyword),
s_keywords,
ImmutableArray(Of RecommendedKeyword).Empty)
End Function
End Class
End Namespace
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