public override async Task ProduceCompletionListAsync(CompletionListContext context)
{
var document = context.Document;
var position = context.Position;
var cancellationToken = context.CancellationToken;
var syntaxTree = await document.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
if (syntaxTree.IsInNonUserCode(position, cancellationToken))
{
return;
}
var token = syntaxTree
.FindTokenOnLeftOfPosition(position, cancellationToken)
.GetPreviousTokenIfTouchingWord(position);
if (!token.IsKind(SyntaxKind.OpenParenToken, SyntaxKind.OpenBracketToken, SyntaxKind.CommaToken))
{
return;
}
var argumentList = token.Parent as BaseArgumentListSyntax;
if (argumentList == null)
{
return;
}
var semanticModel = await document.GetSemanticModelForNodeAsync(argumentList, cancellationToken).ConfigureAwait(false);
var parameterLists = GetParameterLists(semanticModel, position, argumentList.Parent, cancellationToken);
if (parameterLists == null)
{
return;
}
var existingNamedParameters = GetExistingNamedParameters(argumentList, position);
parameterLists = parameterLists.Where(pl => IsValid(pl, existingNamedParameters));
var unspecifiedParameters = parameterLists.SelectMany(pl => pl)
.Where(p => !existingNamedParameters.Contains(p.Name))
.Distinct(this);
if (!unspecifiedParameters.Any())
{
return;
}
if (token.IsMandatoryNamedParameterPosition())
{
context.MakeExclusive(true);
}
var text = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
var filterSpan = CompletionUtilities.GetTextChangeSpan(text, position);
var workspace = document.Project.Solution.Workspace;
foreach (var parameter in unspecifiedParameters)
{
// Note: the filter text does not include the ':'. We want to ensure that if
// the user types the name exactly (up to the colon) that it is selected as an
// exact match.
var escapedName = parameter.Name.ToIdentifierToken().ToString();
context.AddItem(new CompletionItem(
this,
escapedName + ColonString,
filterSpan,
CommonCompletionUtilities.CreateDescriptionFactory(workspace, semanticModel, token.SpanStart, parameter),
parameter.GetGlyph(),
sortText: parameter.Name,
filterText: escapedName,
rules: ItemRules.Instance));
}
}
protected override async Task <IEnumerable <CompletionItem> > GetItemsWorkerAsync(
Document document, int position, CompletionTriggerInfo triggerInfo,
CancellationToken cancellationToken)
{
var tree = await document.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
if (tree.IsInNonUserCode(position, cancellationToken))
{
return(null);
}
var token = tree.FindTokenOnLeftOfPosition(position, cancellationToken);
if (token.IsMandatoryNamedParameterPosition())
{
return(null);
}
var typeInferenceService = document.GetLanguageService <ITypeInferenceService>();
var span = new TextSpan(position, 0);
var semanticModel = await document.GetSemanticModelForSpanAsync(span, cancellationToken).ConfigureAwait(false);
var type = typeInferenceService.InferType(semanticModel, position,
objectAsDefault: true,
cancellationToken: cancellationToken);
// If we have a Nullable<T>, unwrap it.
if (type.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
type = type.GetTypeArguments().FirstOrDefault();
if (type == null)
{
return(null);
}
}
if (type.TypeKind != TypeKind.Enum)
{
type = GetCompletionListType(type, semanticModel.GetEnclosingNamedType(position, cancellationToken), semanticModel.Compilation);
if (type == null)
{
return(null);
}
}
if (!type.IsEditorBrowsable(document.ShouldHideAdvancedMembers(), semanticModel.Compilation))
{
return(null);
}
// Does type have any aliases?
ISymbol alias = await type.FindApplicableAlias(position, semanticModel, cancellationToken).ConfigureAwait(false);
var displayService = document.GetLanguageService <ISymbolDisplayService>();
var displayText = alias != null
? alias.Name
: displayService.ToMinimalDisplayString(semanticModel, position, type);
var workspace = document.Project.Solution.Workspace;
var text = await semanticModel.SyntaxTree.GetTextAsync(cancellationToken).ConfigureAwait(false);
var textChangeSpan = CompletionUtilities.GetTextChangeSpan(text, position);
var item = new CSharpCompletionItem(
workspace,
this,
displayText: displayText,
filterSpan: textChangeSpan,
descriptionFactory: CommonCompletionUtilities.CreateDescriptionFactory(workspace, semanticModel, position, alias ?? type),
glyph: (alias ?? type).GetGlyph(),
preselect: true);
return(SpecializedCollections.SingletonEnumerable(item));
}
internal override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
{
// Bring up on space or at the start of a word, or after a ( or [.
//
// Note: we don't want to bring this up after traditional enum operators like & or |.
// That's because we don't like the experience where the enum appears directly after the
// operator. Instead, the user normally types <space> and we will bring up the list
// then.
var ch = text[characterPosition];
return
(ch == ' ' ||
ch == '[' ||
ch == '(' ||
ch == '~' ||
(options.GetOption(CompletionOptions.TriggerOnTypingLetters, LanguageNames.CSharp) && CompletionUtilities.IsStartingNewWord(text, characterPosition)));
}
public override bool IsInsertionTrigger(SourceText text, int insertedCharacterPosition, CompletionOptions options) => CompletionUtilities.IsTriggerAfterSpaceOrStartOfWordCharacter(text, insertedCharacterPosition, options);
public override bool IsCommitCharacter(CompletionItem completionItem, char ch, string textTypedSoFar)
{
return(CompletionUtilities.IsCommitCharacter(completionItem, ch, textTypedSoFar));
}
protected override int GetTargetCaretPosition(SyntaxNode caretTarget)
{
var methodDeclaration = (MethodDeclarationSyntax)caretTarget;
return(CompletionUtilities.GetTargetCaretPositionForMethod(methodDeclaration));
}
public override bool IsTriggerCharacter(SourceText text, int characterPosition, OptionSet options)
{
return(CompletionUtilities.IsTriggerAfterSpaceOrStartOfWordCharacter(text, characterPosition, options));
}
internal override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
{
return CompletionUtilities.IsTriggerAfterSpaceOrStartOfWordCharacter(text, characterPosition, options);
}
public override bool IsInsertionTrigger(SourceText text, int characterPosition, CompletionOptions options) => CompletionUtilities.IsTriggerCharacter(text, characterPosition, options) || text[characterPosition] == ' ';
protected override TextSpan GetTextChangeSpan(SourceText text, int position)
{
// We can just defer to the standard text span algorithm.
return(CompletionUtilities.GetTextChangeSpan(text, position));
}
private TextSpan GetTextChangeSpan(SourceText text, int position)
{
return(CompletionUtilities.GetTextChangeSpan(text, position));
}
/// <summary>
/// Gets the dot-like token we're after, and also the start of the expression we'd want to place any text before.
/// </summary>
private static (SyntaxToken dotLikeToken, int expressionStart) GetDotAndExpressionStart(SyntaxNode root, int position, CancellationToken cancellationToken)
{
if (CompletionUtilities.GetDotTokenLeftOfPosition(root.SyntaxTree, position, cancellationToken) is not SyntaxToken dotToken)
{
return(default);
public override bool IsInsertionTrigger(SourceText text, int characterPosition, CompletionOptions options) => text[characterPosition] == ' ' || options.TriggerOnTypingLetters && CompletionUtilities.IsStartingNewWord(text, characterPosition);
private async Task <CompletionItem> GetBuilderAsync(Document document, int position, CompletionTriggerInfo triggerInfo, CancellationToken cancellationToken = default(CancellationToken))
{
if (triggerInfo.TriggerReason == CompletionTriggerReason.TypeCharCommand)
{
var text = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
if (triggerInfo.IsDebugger)
{
// Aggressive Intellisense in the debugger: always show the builder
return(new CompletionItem(this, "", CompletionUtilities.GetTextChangeSpan(text, position), isBuilder: true));
}
var tree = await document.GetCSharpSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
var token = tree.FindTokenOnLeftOfPosition(position, cancellationToken);
token = token.GetPreviousTokenIfTouchingWord(position);
if (token.Kind() == SyntaxKind.None)
{
return(null);
}
var semanticModel = await document.GetCSharpSemanticModelForNodeAsync(token.Parent, cancellationToken).ConfigureAwait(false);
var typeInferrer = document.GetLanguageService <ITypeInferenceService>();
if (IsLambdaExpression(semanticModel, position, token, typeInferrer, cancellationToken))
{
return(new CompletionItem(this, CSharpFeaturesResources.LambdaExpression,
CompletionUtilities.GetTextChangeSpan(text, position),
CSharpFeaturesResources.AutoselectDisabledDueToPotentialLambdaDeclaration.ToSymbolDisplayParts(),
isBuilder: true));
}
else if (IsAnonymousObjectCreation(token))
{
return(new CompletionItem(this, CSharpFeaturesResources.MemberName,
CompletionUtilities.GetTextChangeSpan(text, position),
CSharpFeaturesResources.AutoselectDisabledDueToPossibleExplicitlyNamesAnonTypeMemCreation.ToSymbolDisplayParts(),
isBuilder: true));
}
else if (token.IsPreProcessorExpressionContext())
{
return(new CompletionItem(this, "", CompletionUtilities.GetTextChangeSpan(text, position), isBuilder: true));
}
else if (IsImplicitArrayCreation(semanticModel, token, position, typeInferrer, cancellationToken))
{
return(new CompletionItem(this, CSharpFeaturesResources.ImplicitArrayCreation,
CompletionUtilities.GetTextChangeSpan(text, position),
CSharpFeaturesResources.AutoselectDisabledDueToPotentialImplicitArray.ToSymbolDisplayParts(),
isBuilder: true));
}
else
{
return(token.IsKindOrHasMatchingText(SyntaxKind.FromKeyword) || token.IsKindOrHasMatchingText(SyntaxKind.JoinKeyword)
? new CompletionItem(this, CSharpFeaturesResources.RangeVariable,
CompletionUtilities.GetTextChangeSpan(text, position),
CSharpFeaturesResources.AutoselectDisabledDueToPotentialRangeVariableDecl.ToSymbolDisplayParts(),
isBuilder: true)
: null);
}
}
return(null);
}
public override async Task ProduceCompletionListAsync(CompletionListContext context)
{
try
{
var document = context.Document;
var position = context.Position;
var options = context.Options;
var cancellationToken = context.CancellationToken;
var tree = await document.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
if (tree.IsInNonUserCode(position, cancellationToken))
{
return;
}
var token = tree.FindTokenOnLeftOfPosition(position, cancellationToken);
if (token.IsMandatoryNamedParameterPosition())
{
return;
}
var typeInferenceService = document.GetLanguageService <ITypeInferenceService>();
var span = new TextSpan(position, 0);
var semanticModel = await document.GetSemanticModelForSpanAsync(span, cancellationToken).ConfigureAwait(false);
var type = typeInferenceService.InferType(semanticModel, position,
objectAsDefault: true,
cancellationToken: cancellationToken);
// If we have a Nullable<T>, unwrap it.
if (type.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
type = type.GetTypeArguments().FirstOrDefault();
if (type == null)
{
return;
}
}
if (type.TypeKind != TypeKind.Enum)
{
type = GetCompletionListType(type, semanticModel.GetEnclosingNamedType(position, cancellationToken), semanticModel.Compilation);
if (type == null)
{
return;
}
}
if (!type.IsEditorBrowsable(options.GetOption(CompletionOptions.HideAdvancedMembers, semanticModel.Language), semanticModel.Compilation))
{
return;
}
// Does type have any aliases?
ISymbol alias = await type.FindApplicableAlias(position, semanticModel, cancellationToken).ConfigureAwait(false);
var displayService = document.GetLanguageService <ISymbolDisplayService>();
var displayText = alias != null
? alias.Name
: displayService.ToMinimalDisplayString(semanticModel, position, type);
var workspace = document.Project.Solution.Workspace;
var text = await semanticModel.SyntaxTree.GetTextAsync(cancellationToken).ConfigureAwait(false);
var textChangeSpan = CompletionUtilities.GetTextChangeSpan(text, position);
var item = new CompletionItem(
this,
displayText: displayText,
filterSpan: textChangeSpan,
descriptionFactory: CommonCompletionUtilities.CreateDescriptionFactory(workspace, semanticModel, position, alias ?? type),
glyph: (alias ?? type).GetGlyph(),
preselect: true,
rules: ItemRules.Instance);
context.AddItem(item);
}
catch (Exception e) when(FatalError.ReportUnlessCanceled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
internal override TextSpan GetCurrentSpan(TextSpan span, SourceText text)
{
return(CompletionUtilities.GetCompletionItemSpan(text, span.End));
}
protected override bool ShouldTriggerAfterQuotes(SourceText text, int insertedCharacterPosition) => CompletionUtilities.IsStartingNewWord(text, insertedCharacterPosition);
protected override TextSpan GetTextChangeSpan(SourceText text, int position)
{
return(CompletionUtilities.GetTextChangeSpan(text, position));
}
protected override async Task <IEnumerable <CompletionItem> > GetItemsWorkerAsync(
Document document, int position, CompletionTriggerInfo triggerInfo, CancellationToken cancellationToken)
{
var syntaxTree = await document.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
if (syntaxTree.IsInNonUserCode(position, cancellationToken))
{
return(null);
}
var token = syntaxTree.FindTokenOnLeftOfPosition(position, cancellationToken);
token = token.GetPreviousTokenIfTouchingWord(position);
if (token.Kind() != SyntaxKind.OpenParenToken &&
token.Kind() != SyntaxKind.OpenBracketToken &&
token.Kind() != SyntaxKind.CommaToken)
{
return(null);
}
var argumentList = token.Parent as BaseArgumentListSyntax;
if (argumentList == null)
{
return(null);
}
var semanticModel = await document.GetSemanticModelForNodeAsync(argumentList, cancellationToken).ConfigureAwait(false);
var parameterLists = GetParameterLists(semanticModel, position, argumentList.Parent, cancellationToken);
if (parameterLists == null)
{
return(null);
}
var existingNamedParameters = GetExistingNamedParameters(argumentList, position);
parameterLists = parameterLists.Where(pl => IsValid(pl, existingNamedParameters));
var unspecifiedParameters = parameterLists.SelectMany(pl => pl)
.Where(p => !existingNamedParameters.Contains(p.Name))
.Distinct(this);
var text = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
return(unspecifiedParameters.Select(
p =>
{
// Note: the filter text does not include the ':'. We want to ensure that if
// the user types the name exactly (up to the colon) that it is selected as an
// exact match.
var workspace = document.Project.Solution.Workspace;
var escaped = p.Name.ToIdentifierToken().ToString();
return new CompletionItem(
this,
escaped + ColonString,
CompletionUtilities.GetTextChangeSpan(text, position),
CommonCompletionUtilities.CreateDescriptionFactory(workspace, semanticModel, token.SpanStart, p),
p.GetGlyph(),
sortText: p.Name,
filterText: escaped,
rules: ItemRules.Instance);
}));
}
public override bool SendEnterThroughToEditor(CompletionItem completionItem, string textTypedSoFar)
{
return(CompletionUtilities.SendEnterThroughToEditor(completionItem, textTypedSoFar));
}
public override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
{
var c = text[characterPosition];
return(c == '<' || c == '"' || CompletionUtilities.IsTriggerAfterSpaceOrStartOfWordCharacter(text, characterPosition, options));
}
internal override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
{
var ch = text[characterPosition];
return(ch == ' ' || (CompletionUtilities.IsStartingNewWord(text, characterPosition) && options.GetOption(CompletionOptions.TriggerOnTypingLetters2, LanguageNames.CSharp)));
}
public override bool IsTriggerCharacter(SourceText text, int characterPosition, OptionSet options)
{
return(CompletionUtilities.IsTriggerCharacter(text, characterPosition, options) || text[characterPosition] == ' ');
}
internal override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
{
return(CompletionUtilities.IsTriggerCharacter(text, characterPosition, options));
}
private async Task <IEnumerable <CompletionItem> > GetCompletionsOffOfExplicitInterfaceAsync(
Document document, SemanticModel semanticModel, int position, NameSyntax name, CancellationToken cancellationToken)
{
// Bind the interface name which is to the left of the dot
var syntaxTree = semanticModel.SyntaxTree;
var nameBinding = semanticModel.GetSymbolInfo(name, cancellationToken);
var context = CSharpSyntaxContext.CreateContext(document.Project.Solution.Workspace, semanticModel, position, cancellationToken);
var symbol = nameBinding.Symbol as ITypeSymbol;
if (symbol == null || symbol.TypeKind != TypeKind.Interface)
{
return(SpecializedCollections.EmptyEnumerable <CompletionItem>());
}
var members = semanticModel.LookupSymbols(
position: name.SpanStart,
container: symbol)
.Where(s => !s.IsStatic)
.FilterToVisibleAndBrowsableSymbols(document.ShouldHideAdvancedMembers(), semanticModel.Compilation);
// We're going to create a entry for each one, including the signature
var completions = new List <CompletionItem>();
var signatureDisplayFormat =
new SymbolDisplayFormat(
genericsOptions: SymbolDisplayGenericsOptions.IncludeTypeParameters,
memberOptions:
SymbolDisplayMemberOptions.IncludeParameters,
parameterOptions:
SymbolDisplayParameterOptions.IncludeName |
SymbolDisplayParameterOptions.IncludeType |
SymbolDisplayParameterOptions.IncludeParamsRefOut,
miscellaneousOptions:
SymbolDisplayMiscellaneousOptions.EscapeKeywordIdentifiers |
SymbolDisplayMiscellaneousOptions.UseSpecialTypes);
var namePosition = name.SpanStart;
var text = await context.SyntaxTree.GetTextAsync(cancellationToken).ConfigureAwait(false);
var textChangeSpan = CompletionUtilities.GetTextChangeSpan(text, context.Position);
foreach (var member in members)
{
var displayString = member.ToMinimalDisplayString(semanticModel, namePosition, signatureDisplayFormat);
var memberCopied = member;
var insertionText = displayString;
completions.Add(new SymbolCompletionItem(
this,
displayString,
insertionText: insertionText,
filterSpan: textChangeSpan,
position: position,
symbols: new List <ISymbol> {
member
},
context: context,
rules: ItemRules.Instance));
}
return(completions);
}
public override bool IsInsertionTrigger(
SourceText text,
int characterPosition,
OptionSet options
) => CompletionUtilities.IsTriggerCharacter(text, characterPosition, options);
public override async Task ProduceCompletionListAsync(CompletionListContext context)
{
var document = context.Document;
var position = context.Position;
var options = context.Options;
var cancellationToken = context.CancellationToken;
var span = new TextSpan(position, length: 0);
var semanticModel = await document.GetSemanticModelForSpanAsync(span, cancellationToken).ConfigureAwait(false);
var syntaxTree = semanticModel.SyntaxTree;
var syntaxFacts = document.GetLanguageService <ISyntaxFactsService>();
var semanticFacts = document.GetLanguageService <ISemanticFactsService>();
if (syntaxFacts.IsInNonUserCode(syntaxTree, position, cancellationToken) ||
semanticFacts.IsPreProcessorDirectiveContext(semanticModel, position, cancellationToken))
{
return;
}
if (!syntaxTree.IsRightOfDotOrArrowOrColonColon(position, cancellationToken))
{
return;
}
var node = syntaxTree.FindTokenOnLeftOfPosition(position, cancellationToken)
.GetPreviousTokenIfTouchingWord(position)
.Parent;
if (node.Kind() != SyntaxKind.ExplicitInterfaceSpecifier)
{
return;
}
// Bind the interface name which is to the left of the dot
var name = ((ExplicitInterfaceSpecifierSyntax)node).Name;
var symbol = semanticModel.GetSymbolInfo(name, cancellationToken).Symbol as ITypeSymbol;
if (symbol?.TypeKind != TypeKind.Interface)
{
return;
}
var members = semanticModel.LookupSymbols(
position: name.SpanStart,
container: symbol)
.Where(s => !s.IsStatic)
.FilterToVisibleAndBrowsableSymbols(options.GetOption(CompletionOptions.HideAdvancedMembers, semanticModel.Language), semanticModel.Compilation);
// We're going to create a entry for each one, including the signature
var namePosition = name.SpanStart;
var text = await syntaxTree.GetTextAsync(cancellationToken).ConfigureAwait(false);
var textChangeSpan = CompletionUtilities.GetTextChangeSpan(text, position);
foreach (var member in members)
{
var displayText = member.ToMinimalDisplayString(semanticModel, namePosition, s_signatureDisplayFormat);
var insertionText = displayText;
context.AddItem(new SymbolCompletionItem(
this,
displayText,
insertionText: insertionText,
filterSpan: textChangeSpan,
position: position,
symbols: new List <ISymbol> {
member
},
context: CSharpSyntaxContext.CreateContext(document.Project.Solution.Workspace, semanticModel, position, cancellationToken),
rules: ItemRules.Instance));
}
}
