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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
Namespace Microsoft.CodeAnalysis.VisualBasic.Completion.KeywordRecommenders.PreprocessorDirectives
''' <summary>
''' Recommends the "#End Region" directive
''' </summary>
Friend Class EndRegionDirectiveKeywordRecommender
Inherits AbstractKeywordRecommender
Protected Overrides Function RecommendKeywords(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As ImmutableArray(Of RecommendedKeyword)
If context.IsPreprocessorEndDirectiveKeywordContext AndAlso
HasUnmatchedRegionDirective(context, cancellationToken) Then
Return ImmutableArray.Create(New RecommendedKeyword("Region", VBFeaturesResources.Terminates_a_SharpRegion_block))
End If
If context.IsPreprocessorStartContext Then
Dim directives = context.SyntaxTree.GetStartDirectives(cancellationToken)
If HasUnmatchedRegionDirective(context, cancellationToken) Then
Return ImmutableArray.Create(New RecommendedKeyword("#End Region", VBFeaturesResources.Terminates_a_SharpRegion_block))
End If
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
Private Shared Function HasUnmatchedRegionDirective(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As Boolean
Dim directives = context.SyntaxTree.GetStartDirectives(cancellationToken)
For Each directive In directives
If directive.Kind = SyntaxKind.RegionDirectiveTrivia AndAlso directive.Span.End <= context.Position Then
If directive.GetMatchingStartOrEndDirective(cancellationToken) Is Nothing Then
Return True
End If
End If
Next
Return False
End Function
End Class
End Namespace
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