/// <summary>
/// Populates R completion list for a given position
/// </summary>
/// <param name="position">Position in R text buffer</param>
/// <param name="session">Completion session</param>
/// <param name="completionSets">Completion sets to add to</param>
/// <param name="ast">Document abstract syntax tree</param>
internal void PopulateCompletionList(int position, ICompletionSession session, IList <CompletionSet> completionSets, AstRoot ast)
{
RCompletionContext context = new RCompletionContext(session, _textBuffer, ast, position);
bool autoShownCompletion = true;
if (session.TextView.Properties.ContainsProperty(CompletionController.AutoShownCompletion))
{
autoShownCompletion = session.TextView.Properties.GetProperty <bool>(CompletionController.AutoShownCompletion);
}
IReadOnlyCollection <IRCompletionListProvider> providers =
RCompletionEngine.GetCompletionForLocation(context, autoShownCompletion, _shell);
// Position is in R as is the applicable spa, so no need to map down
Span?applicableSpan = GetApplicableSpan(position, session);
if (applicableSpan.HasValue)
{
ITrackingSpan trackingSpan = context.TextBuffer.CurrentSnapshot.CreateTrackingSpan(applicableSpan.Value, SpanTrackingMode.EdgeInclusive);
List <RCompletion> completions = new List <RCompletion>();
bool sort = true;
foreach (IRCompletionListProvider provider in providers)
{
IReadOnlyCollection <RCompletion> entries = provider.GetEntries(context);
Debug.Assert(entries != null);
if (entries.Count > 0)
{
completions.AddRange(entries);
}
sort &= provider.AllowSorting;
}
if (sort)
{
completions.Sort(RCompletion.CompareOrdinal);
completions.RemoveDuplicates(RCompletion.CompareOrdinal);
}
CompletionSet completionSet = new RCompletionSet(session.TextView.TextBuffer, trackingSpan, completions);
completionSets.Add(completionSet);
}
}
/// <summary>
/// Should this key press trigger a completion session?
/// </summary>
public override bool IsTriggerChar(char typedCharacter)
{
if (!HasActiveCompletionSession)
{
switch (typedCharacter)
{
case '$':
case '@':
return(true);
case ':':
return(RCompletionContext.IsCaretInNamespace(TextView));
case '(':
return(RCompletionContext.IsCaretInLibraryStatement(TextView));
default:
if (_settings.ShowCompletionOnFirstChar)
{
SnapshotPoint?position = REditorDocument.MapCaretPositionFromView(TextView);
if (position.HasValue)
{
int pos = position.Value;
var snapshot = position.Value.Snapshot;
// Trigger on first character
if (RTokenizer.IsIdentifierCharacter(typedCharacter) && !char.IsDigit(typedCharacter))
{
// Ignore if this is not the first character
return(pos <= 1 || (pos > 1 && !RTokenizer.IsIdentifierCharacter(snapshot[pos - 2])));
}
}
}
break;
}
}
return(false);
}