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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.Composition
Imports System.Threading
Imports Microsoft.CodeAnalysis.Completion
Imports Microsoft.CodeAnalysis.Completion.Providers
Imports Microsoft.CodeAnalysis.Host.Mef
Imports Microsoft.CodeAnalysis.Options
Imports Microsoft.CodeAnalysis.Text
Imports Microsoft.CodeAnalysis.VisualBasic.Extensions.ContextQuery
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
Namespace Microsoft.CodeAnalysis.VisualBasic.Completion.Providers
<ExportCompletionProvider(NameOf(ObjectCreationCompletionProvider), LanguageNames.VisualBasic)>
<ExtensionOrder(After:=NameOf(ObjectInitializerCompletionProvider))>
<[Shared]>
Partial Friend Class ObjectCreationCompletionProvider
Inherits AbstractObjectCreationCompletionProvider(Of VisualBasicSyntaxContext)
<ImportingConstructor>
<Obsolete(MefConstruction.ImportingConstructorMessage, True)>
Public Sub New()
End Sub
Friend Overrides ReadOnly Property Language As String
Get
Return LanguageNames.VisualBasic
End Get
End Property
Public Overrides Function IsInsertionTrigger(text As SourceText, characterPosition As Integer, options As CompletionOptions) As Boolean
Return CompletionUtilities.IsTriggerAfterSpaceOrStartOfWordCharacter(text, characterPosition, options)
End Function
Public Overrides ReadOnly Property TriggerCharacters As ImmutableHashSet(Of Char) = CompletionUtilities.SpaceTriggerChar
Protected Overrides Function GetObjectCreationNewExpression(tree As SyntaxTree, position As Integer, cancellationToken As CancellationToken) As SyntaxNode
Dim newExpression As SyntaxNode = Nothing
If tree IsNot Nothing AndAlso Not tree.IsInNonUserCode(position, cancellationToken) AndAlso Not tree.IsInSkippedText(position, cancellationToken) Then
Dim newToken = tree.FindTokenOnLeftOfPosition(position, cancellationToken)
newToken = newToken.GetPreviousTokenIfTouchingWord(position)
' Only after 'new'.
If newToken.Kind = SyntaxKind.NewKeyword Then
' Only if the 'new' belongs to an object creation expression.
If tree.IsObjectCreationTypeContext(position, cancellationToken) Then
newExpression = TryCast(newToken.Parent, ExpressionSyntax)
End If
End If
End If
Return newExpression
End Function
Private Shared ReadOnly s_rules As CompletionItemRules =
CompletionItemRules.Create(
commitCharacterRules:=ImmutableArray.Create(CharacterSetModificationRule.Create(CharacterSetModificationKind.Replace, " "c, "("c)),
matchPriority:=MatchPriority.Preselect,
selectionBehavior:=CompletionItemSelectionBehavior.HardSelection)
Protected Overrides Function GetCompletionItemRules(symbols As ImmutableArray(Of SymbolAndSelectionInfo)) As CompletionItemRules
Return s_rules
End Function
Protected Overrides Function GetDisplayAndSuffixAndInsertionText(symbol As ISymbol, context As VisualBasicSyntaxContext) As (displayText As String, suffix As String, insertionText As String)
Dim displayString = symbol.ToMinimalDisplayString(context.SemanticModel, context.Position)
Return (displayString, "", displayString)
End Function
End Class
End Namespace
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