public void SimpleList_FindItemAtPosition(string input, int position, string expectedItemValue)
{
SimpleList list = MSBuildExpression.ParseSimpleList(input);
DumpList(list, input);
SimpleListItem actualItem = list.FindItemAt(position);
Assert.NotNull(actualItem);
Assert.Equal(expectedItemValue, actualItem.Value);
string actualInput = input.Substring(
startIndex: actualItem.AbsoluteStart,
length: actualItem.AbsoluteEnd - actualItem.AbsoluteStart
);
Assert.Equal(expectedItemValue, actualInput);
}
/// <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));
}
Log.Verbose("Evaluate completions for {XmlLocation:l}", location);
List <CompletionItem> completions = new List <CompletionItem>();
using (await projectDocument.Lock.ReaderLockAsync())
{
XSAttribute attribute;
if (!location.CanCompleteAttributeValue(out attribute, onElementWithPath: WellKnownElementPaths.Target) || !SupportedAttributeNames.Contains(attribute.Name))
{
Log.Verbose("Not offering any completions for {XmlLocation:l} (not the value of a supported attribute on a 'Target' element).", location);
return(null);
}
Range targetRange = attribute.ValueRange;
HashSet <string> excludeTargetNames = new HashSet <string>();
// Handle potentially composite (i.e. "Value1;Value2;Value3") values, where it's legal to have them.
if (attribute.Name != "Name" && attribute.Value.IndexOf(';') != -1)
{
int startPosition = projectDocument.XmlPositions.GetAbsolutePosition(attribute.ValueRange.Start);
int relativePosition = location.AbsolutePosition - startPosition;
SimpleList list = MSBuildExpression.ParseSimpleList(attribute.Value);
SimpleListItem itemAtPosition = list.FindItemAt(relativePosition);
if (itemAtPosition == null)
{
return(null);
}
Log.Verbose("Completions will replace item {ItemValue} spanning [{ItemStartPosition}..{ItemEndPosition}) in MSBuild simple list expression {ListExpression}.",
itemAtPosition.Value,
itemAtPosition.AbsoluteStart,
itemAtPosition.AbsoluteEnd,
attribute.Value
);
targetRange = projectDocument.XmlPositions.GetRange(
absoluteStartPosition: startPosition + itemAtPosition.AbsoluteStart,
absoluteEndPosition: startPosition + itemAtPosition.AbsoluteEnd
);
}
completions.AddRange(
GetCompletionItems(projectDocument, targetRange, excludeTargetNames)
);
}
if (completions.Count == 0)
{
return(null); // No completions provided.
}
Log.Verbose("Offering {CompletionCount} completion(s) for {XmlLocation:l}", completions.Count, location);
return(new CompletionList(completions,
isIncomplete: false // Consider this list to be exhaustive
));
}