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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.EventHandling
''' <summary>
''' Recommends the "Handles" keyword.
''' </summary>
Friend Class HandlesKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("Handles", VBFeaturesResources.Declares_that_a_procedure_handles_a_specified_event))
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
If context.IsFollowingParameterListOrAsClauseOfMethodDeclaration() Then
Dim targetToken = context.TargetToken
Dim typeBlock = targetToken.GetAncestor(Of TypeBlockSyntax)()
If typeBlock Is Nothing OrElse Not typeBlock.IsKind(SyntaxKind.ClassBlock, SyntaxKind.ModuleBlock) Then
Return ImmutableArray(Of RecommendedKeyword).Empty
End If
Dim methodDeclaration = targetToken.GetAncestor(Of MethodStatementSyntax)()
If methodDeclaration Is Nothing OrElse methodDeclaration.Modifiers.Any(SyntaxKind.IteratorKeyword) Then
Return ImmutableArray(Of RecommendedKeyword).Empty
End If
Return s_keywords
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
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