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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.Expressions
''' <summary>
''' Recommends the "Sub", "Function", "Async" and "Iterator" keywords in expression contexts that would start a lambda.
''' </summary>
Friend Class LambdaKeywordRecommender
Inherits AbstractKeywordRecommender
Protected Overrides Function RecommendKeywords(context As VisualBasicSyntaxContext, cancellationToken As CancellationToken) As ImmutableArray(Of RecommendedKeyword)
If context.IsAnyExpressionContext OrElse context.IsDelegateCreationContext() Then
Return ImmutableArray.Create(
New RecommendedKeyword("Async", VBFeaturesResources.Defines_an_asynchronous_lambda_expression_that_can_use_the_Await_operator_Can_be_used_wherever_a_delegate_type_is_expected_Async_Sub_Function_parameterList_expression),
New RecommendedKeyword("Function", VBFeaturesResources.Defines_a_lambda_expression_that_calculates_and_returns_a_single_value_Can_be_used_wherever_a_delegate_type_is_expected_Function_parameterList_expression),
New RecommendedKeyword("Iterator", VBFeaturesResources.Defines_an_iterator_lambda_expression_that_can_use_the_Yield_statement_Iterator_Function_parameterList_As_IEnumerable_Of_T),
New RecommendedKeyword("Sub", VBFeaturesResources.Defines_a_lambda_expression_that_can_execute_statements_and_does_not_return_a_value_Can_be_used_wherever_a_delegate_type_is_expected_Sub_parameterList_statement))
End If
Dim targetToken = context.TargetToken
If context.SyntaxTree.IsExpressionContext(targetToken.SpanStart, cancellationToken, context.SemanticModel) Then
If targetToken.IsKindOrHasMatchingText(SyntaxKind.IteratorKeyword) Then
Return ImmutableArray.Create(New RecommendedKeyword("Function", VBFeaturesResources.Defines_a_lambda_expression_that_calculates_and_returns_a_single_value_Can_be_used_wherever_a_delegate_type_is_expected_Function_parameterList_expression))
ElseIf targetToken.IsKindOrHasMatchingText(SyntaxKind.AsyncKeyword) Then
Return ImmutableArray.Create(
New RecommendedKeyword("Function", VBFeaturesResources.Defines_a_lambda_expression_that_calculates_and_returns_a_single_value_Can_be_used_wherever_a_delegate_type_is_expected_Function_parameterList_expression),
New RecommendedKeyword("Sub", VBFeaturesResources.Defines_a_lambda_expression_that_can_execute_statements_and_does_not_return_a_value_Can_be_used_wherever_a_delegate_type_is_expected_Sub_parameterList_statement))
End If
End If
Return ImmutableArray(Of RecommendedKeyword).Empty
End Function
End Class
End Namespace
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