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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.Statements
''' <summary>
''' Recommends the "When" keyword for a Catch filter
''' </summary>
Friend Class WhenKeywordRecommender
Inherits AbstractKeywordRecommender
Private Shared ReadOnly s_keywords As ImmutableArray(Of RecommendedKeyword) =
ImmutableArray.Create(New RecommendedKeyword("When", VBFeaturesResources.Adds_a_conditional_test_to_a_Catch_statement_Exceptions_are_caught_by_that_Catch_statement_only_when_the_conditional_test_that_follows_the_When_keyword_evaluates_to_True))
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.IsFromIdentifierNode(Of CatchStatementSyntax)(Function(catchStatement) catchStatement.IdentifierName) Then
Return s_keywords
End If
If context.SyntaxTree.IsFollowingCompleteExpression(Of SimpleAsClauseSyntax)(context.Position, context.TargetToken,
childGetter:=Function(asClause) If(TypeOf asClause.Parent Is CatchStatementSyntax, asClause.Type, Nothing), cancellationToken:=cancellationToken) Then
Return s_keywords
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
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