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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
Imports Microsoft.CodeAnalysis.VisualBasic.Utilities
Namespace Microsoft.CodeAnalysis.VisualBasic.Completion.KeywordRecommenders.Declarations
''' <summary>
''' Recommends the "Event" keyword in type declaration contexts
''' </summary>
Friend Class EventKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("Event", VBFeaturesResources.Declares_a_user_defined_event))
Protected Overrides Function RecommendKeywords(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As ImmutableArray(Of RecommendedKeyword)
If context.IsTypeMemberDeclarationKeywordContext OrElse context.IsInterfaceMemberDeclarationKeywordContext Then
Dim modifiers = context.ModifierCollectionFacts
If modifiers.CouldApplyToOneOf(PossibleDeclarationTypes.Event) Then
Return s_keywords
End If
End If
' We also allow "Event" after Custom (which is parsed as an identifier) in a class/structure declaration context
If context.FollowsEndOfStatement Then
Return ImmutableArray(Of RecommendedKeyword).Empty
End If
Dim targetToken = context.TargetToken
If targetToken.Kind = SyntaxKind.IdentifierToken AndAlso SyntaxFacts.GetContextualKeywordKind(targetToken.GetIdentifierText()) = SyntaxKind.CustomKeyword Then
If targetToken.GetAncestor(Of MethodBlockBaseSyntax)() Is Nothing AndAlso
targetToken.GetInnermostDeclarationContext().IsKind(SyntaxKind.StructureBlock, SyntaxKind.ClassBlock) Then
Dim variableDeclarator = targetToken.GetAncestor(Of VariableDeclaratorSyntax)()
If variableDeclarator IsNot Nothing Then
If variableDeclarator.Names.Count = 1 AndAlso variableDeclarator.Names.First().Identifier = targetToken Then
Return s_keywords
End If
End If
End If
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
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