public void CanCompleteAttribute(string testFileName, int line, int column, string expectedElementName, PaddingType expectedPadding)
{
Position testPosition = new Position(line, column);
string testXml = LoadTestFile("TestFiles", testFileName + ".xml");
TextPositions positions = new TextPositions(testXml);
XmlDocumentSyntax document = Parser.ParseText(testXml);
XmlLocator locator = new XmlLocator(document, positions);
XmlLocation location = locator.Inspect(testPosition);
Assert.NotNull(location);
XSPath elementPath = XSPath.Parse(expectedElementName);
XSElement element;
XSAttribute replaceAttribute;
PaddingType needsPadding;
Assert.True(
location.CanCompleteAttribute(out element, out replaceAttribute, out needsPadding, onElementWithPath: elementPath),
"CanCompleteAttribute"
);
Assert.NotNull(element);
Assert.Null(replaceAttribute);
Assert.Equal(expectedPadding, needsPadding);
}
/// <summary>
/// Get completions for item attributes.
/// </summary>
/// <param name="location">
/// The <see cref="XmlLocation"/> where completions are requested.
/// </param>
/// <param name="projectDocument">
/// The <see cref="ProjectDocument"/> that contains the <paramref name="location"/>.
/// </param>
/// <param name="existingMetadata">
/// Metadata already declared on the item.
/// </param>
/// <returns>
/// A sequence of <see cref="CompletionItem"/>s.
/// </returns>
IEnumerable <CompletionItem> GetAttributeCompletions(XmlLocation location, ProjectDocument projectDocument, HashSet <string> existingMetadata)
{
Log.Verbose("Evaluate attribute completions for {XmlLocation:l}", location);
XSElement itemElement;
XSAttribute replaceAttribute;
PaddingType needsPadding;
if (!location.CanCompleteAttribute(out itemElement, out replaceAttribute, out needsPadding))
{
Log.Verbose("Not offering any attribute completions for {XmlLocation:l} (not a location where we can offer attribute completion.", location);
yield break;
}
// Must be an item element.
if (!itemElement.HasParentPath(WellKnownElementPaths.ItemGroup))
{
Log.Verbose("Not offering any attribute completions for {XmlLocation:l} (element is not a direct child of a 'PropertyGroup' element).", location);
yield break;
}
string itemType = itemElement.Name;
if (String.IsNullOrWhiteSpace(itemType))
{
Log.Verbose("Not offering any attribute completions for {XmlLocation:l} (element represents a new, unnamed, item group).",
location,
itemType
);
yield break;
}
if (MSBuildSchemaHelp.ForItemType(itemType) == null)
{
Log.Verbose("Not offering any attribute completions for {XmlLocation:l} ({ItemType} is not a well-known item type).",
location,
itemType
);
yield break;
}
Log.Verbose("Will offer attribute completions for {XmlLocation:l} (padding: {NeedsPadding})", location, needsPadding);
// Don't offer completions for existing metadata.
existingMetadata.UnionWith(
GetExistingMetadataNames(itemElement)
);
Range replaceRange = replaceAttribute?.Range ?? location.Position.ToEmptyRange();
foreach (string metadataName in MSBuildSchemaHelp.WellKnownItemMetadataNames(itemType))
{
if (existingMetadata.Contains(metadataName))
{
continue;
}
if (MSBuildHelper.IsWellKnownItemMetadata(metadataName))
{
continue;
}
yield return(new CompletionItem
{
Label = metadataName,
Kind = CompletionItemKind.Field,
Detail = "Item Metadata",
Documentation = MSBuildSchemaHelp.ForItemMetadata(itemType, metadataName),
SortText = GetItemSortText(metadataName),
TextEdit = new TextEdit
{
NewText = $"{metadataName}=\"$0\"".WithPadding(needsPadding),
Range = replaceRange.ToLsp()
},
InsertTextFormat = InsertTextFormat.Snippet
});
}
}
/// <summary>
/// Provide completions for the specified location.
/// </summary>
/// <param name="location">
/// The <see cref="XmlLocation"/> where completions are requested.
/// </param>
/// <param name="projectDocument">
/// The <see cref="ProjectDocument"/> that contains the <paramref name="location"/>.
/// </param>
/// <param name="cancellationToken">
/// A <see cref="CancellationToken"/> that can be used to cancel the operation.
/// </param>
/// <returns>
/// A <see cref="Task{TResult}"/> that resolves either a <see cref="CompletionList"/>s, or <c>null</c> if no completions are provided.
/// </returns>
public override async Task <CompletionList> ProvideCompletions(XmlLocation location, ProjectDocument projectDocument, CancellationToken cancellationToken = default(CancellationToken))
{
if (location == null)
{
throw new ArgumentNullException(nameof(location));
}
if (projectDocument == null)
{
throw new ArgumentNullException(nameof(projectDocument));
}
List <CompletionItem> completions = new List <CompletionItem>();
using (await projectDocument.Lock.ReaderLockAsync())
{
XSElement element;
XSAttribute replaceAttribute;
PaddingType needsPadding;
if (!location.CanCompleteAttribute(out element, out replaceAttribute, out needsPadding))
{
return(null);
}
// Must be a valid item element.
if (!element.IsValid || !element.HasParentPath(WellKnownElementPaths.ItemGroup))
{
return(null);
}
Range replaceRange = replaceAttribute?.Range ?? location.Position.ToEmptyRange();
completions.AddRange(
WellKnownItemAttributes.Except(
element.AttributeNames
)
.Select(attributeName => new CompletionItem
{
Label = attributeName,
Detail = "Attribute",
Documentation =
MSBuildSchemaHelp.ForItemMetadata(itemType: element.Name, metadataName: attributeName)
??
MSBuildSchemaHelp.ForAttribute(element.Name, attributeName),
Kind = CompletionItemKind.Field,
SortText = GetItemSortText(attributeName),
TextEdit = new TextEdit
{
NewText = $"{attributeName}=\"$1\"$0".WithPadding(needsPadding),
Range = replaceRange.ToLsp()
},
InsertTextFormat = InsertTextFormat.Snippet
})
);
}
if (completions.Count == 0)
{
return(null);
}
return(new CompletionList(completions, isIncomplete: false));
}
/// <summary>
/// Provide completions for the specified location.
/// </summary>
/// <param name="location">
/// The <see cref="XmlLocation"/> where completions are requested.
/// </param>
/// <param name="projectDocument">
/// The <see cref="ProjectDocument"/> that contains the <paramref name="location"/>.
/// </param>
/// <param name="triggerCharacters">
/// The character(s), if any, that triggered completion.
/// </param>
/// <param name="cancellationToken">
/// A <see cref="CancellationToken"/> that can be used to cancel the operation.
/// </param>
/// <returns>
/// A <see cref="Task{TResult}"/> that resolves either a <see cref="CompletionList"/>s, or <c>null</c> if no completions are provided.
/// </returns>
public override async Task <CompletionList> ProvideCompletions(XmlLocation location, ProjectDocument projectDocument, string triggerCharacters, CancellationToken cancellationToken = default(CancellationToken))
{
if (location == null)
{
throw new ArgumentNullException(nameof(location));
}
if (projectDocument == null)
{
throw new ArgumentNullException(nameof(projectDocument));
}
if (!projectDocument.Workspace.Configuration.Language.CompletionsFromProject.Contains(CompletionSource.Task))
{
Log.Verbose("Not offering task attribute completions for {XmlLocation:l} (task completions not enabled in extension settings).", location);
return(null);
}
if (!projectDocument.HasMSBuildProject)
{
Log.Verbose("Not offering task attribute completions for {XmlLocation:l} (underlying MSBuild project is not loaded).", location);
return(null);
}
List <CompletionItem> completions = new List <CompletionItem>();
Log.Verbose("Evaluate completions for {XmlLocation:l}", location);
using (await projectDocument.Lock.ReaderLockAsync())
{
XSElement taskElement;
XSAttribute replaceAttribute;
PaddingType needsPadding;
if (!location.CanCompleteAttribute(out taskElement, out replaceAttribute, out needsPadding))
{
Log.Verbose("Not offering any completions for {XmlLocation:l} (not a location an attribute can be created or replaced by completion).", location);
return(null);
}
if (taskElement.ParentElement?.Name != "Target")
{
Log.Verbose("Not offering any completions for {XmlLocation:l} (attribute is not on an element that's a direct child of a 'Target' element).", location);
return(null);
}
Dictionary <string, MSBuildTaskMetadata> projectTasks = await GetProjectTasks(projectDocument);
MSBuildTaskMetadata taskMetadata;
if (!projectTasks.TryGetValue(taskElement.Name, out taskMetadata))
{
Log.Verbose("Not offering any completions for {XmlLocation:l} (no metadata available for task {TaskName}).", location, taskElement.Name);
return(null);
}
Range replaceRange = replaceAttribute?.Range ?? location.Position.ToEmptyRange();
if (replaceAttribute != null)
{
Log.Verbose("Offering completions to replace attribute {AttributeName} @ {ReplaceRange:l}",
replaceAttribute.Name,
replaceRange
);
}
else
{
Log.Verbose("Offering completions to create attribute @ {ReplaceRange:l}",
replaceRange
);
}
HashSet <string> existingAttributeNames = new HashSet <string>(
taskElement.AttributeNames
);
if (replaceAttribute != null)
{
existingAttributeNames.Remove(replaceAttribute.Name);
}
completions.AddRange(
GetCompletionItems(projectDocument, taskMetadata, existingAttributeNames, replaceRange, needsPadding)
);
}
Log.Verbose("Offering {CompletionCount} completion(s) for {XmlLocation:l}", completions.Count, location);
if (completions.Count == 0)
{
return(null);
}
return(new CompletionList(completions,
isIncomplete: false // Consider this list to be exhaustive
));
}