/// <summary>
/// Initializes a new instance with the specified properties.
/// </summary>
/// <param name="moniker">The unique, non-localized identifier for the
/// completion set.</param>
/// <param name="displayName">The localized name of the completion set.
/// </param>
/// <param name="applicableTo">The tracking span to which the
/// completions apply.</param>
/// <param name="completions">The list of completions.</param>
/// <param name="options">The options to use for filtering and
/// selecting items.</param>
/// <param name="comparer">The comparer to use to order the provided
/// completions.</param>
public FuzzyCompletionSet(string moniker, string displayName, ITrackingSpan applicableTo,
IEnumerable <DynamicallyVisibleCompletion> completions,
CompletionOptions options, IComparer <Completion> comparer,
Func <string, IEnumerable <DynamicallyVisibleCompletion> > deferredLoadCallback) :
base(moniker, displayName, applicableTo, null, null)
{
_options = options;
_initialComparer = comparer;
_completions = new BulkObservableCollection <Completion>();
_loadedDeferredCompletionSubsets = new HashSet <string>(StringComparer.OrdinalIgnoreCase);
_deferredLoadCallback = deferredLoadCallback;
_completions.AddRange(completions
.Where(c => c != null && !string.IsNullOrWhiteSpace(c.DisplayText))
.OrderBy(c => c, comparer)
);
_comparer = new FuzzyStringMatcher(options.SearchMode);
_shouldFilter = options.FilterCompletions;
_shouldHideAdvanced = options.HideAdvancedMembers && !_completions.All(IsAdvanced);
if (_shouldFilter | _shouldHideAdvanced)
{
_filteredCompletions = new WritableFilteredObservableCollection <Completion>(_completions);
foreach (var c in _completions.Cast <DynamicallyVisibleCompletion>())
{
c.Visible = !_shouldHideAdvanced || !IsAdvanced(c);
}
_filteredCompletions.Filter(IsVisible);
}
}
/// <summary>
/// Determines the best match in the completion set.
/// </summary>
public override void SelectBestMatch()
{
var text = ApplicableTo.GetText(ApplicableTo.TextBuffer.CurrentSnapshot);
Completion bestMatch = _previousSelection;
int bestValue = 0;
bool isUnique = true;
bool allowSelect = true;
if (!string.IsNullOrWhiteSpace(text))
{
// Using the Completions property to only search through visible
// completions.
foreach (var comp in Completions)
{
int value = _comparer.GetSortKey(comp.DisplayText, text);
if (bestMatch == null || value > bestValue)
{
bestMatch = comp;
bestValue = value;
isUnique = true;
}
else if (value == bestValue)
{
isUnique = false;
}
}
}
else
{
foreach (var comp in Completions)
{
DateTime temp;
if (IntellisenseExtensions.LastCommittedCompletions.TryGetValue(comp.DisplayText, out temp))
{
var score = FuzzyStringMatcher.CalculateElapsedTimeBonus(temp);
if (bestMatch == null || score > bestValue)
{
bestMatch = comp;
bestValue = score;
isUnique = true;
}
}
}
}
if (bestMatch == null)
{
bestMatch = Completions[0];
}
if (((DynamicallyVisibleCompletion)bestMatch).Visible && bestValue > 0)
{
SelectionStatus = new CompletionSelectionStatus(bestMatch,
isSelected: allowSelect && bestValue > 0,
isUnique: isUnique);
}
else
{
SelectionStatus = new CompletionSelectionStatus(null,
isSelected: false,
isUnique: false);
}
_previousSelection = bestMatch;
}