public Session(Controller controller, ModelComputation <Model> computation, ICompletionRules completionRules, ICompletionPresenterSession presenterSession)
: base(controller, computation, presenterSession)
{
_completionRules = completionRules;
this.PresenterSession.ItemCommitted += OnPresenterSessionItemCommitted;
this.PresenterSession.ItemSelected += OnPresenterSessionItemSelected;
}
private bool MatchesFilterText(
CompletionItem item,
string filterText,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason reason)
{
return(completionRules.MatchesFilterText(item, filterText, triggerInfo, reason) ?? false);
}
private bool IsBetterFilterMatch(
CompletionItem item,
CompletionItem bestItem,
string filterText,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason filterReason)
{
return(completionRules.IsBetterFilterMatch(item, bestItem, filterText, triggerInfo, filterReason) ?? false);
}
private bool IsHardSelection(
Model model,
CompletionItem bestFilterMatch,
ITextSnapshot textSnapshot,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason reason)
{
if (model.Builder != null)
{
return(bestFilterMatch != null && bestFilterMatch.DisplayText == model.Builder.DisplayText);
}
if (bestFilterMatch == null || model.UseSuggestionCompletionMode)
{
return(false);
}
// We don't have a builder and we have a best match. Normally this will be hard
// selected, except for a few cases. Specifically, if no filter text has been
// provided, and this is not a preselect match then we will soft select it. This
// happens when the completion list comes up implicitly and there is something in
// the MRU list. In this case we do want to select it, but not with a hard
// selection. Otherwise you can end up with the following problem:
//
// dim i as integer =<space>
//
// Completion will comes up after = with 'integer' selected (Because of MRU). We do
// not want 'space' to commit this.
var viewSpan = model.GetSubjectBufferFilterSpanInViewBuffer(bestFilterMatch.FilterSpan);
var fullFilterText = model.GetCurrentTextInSnapshot(viewSpan, textSnapshot, endPoint: null);
var shouldSoftSelect = completionRules.ShouldSoftSelectItem(GetExternallyUsableCompletionItem(bestFilterMatch), fullFilterText, triggerInfo);
if (shouldSoftSelect == true)
{
return(false);
}
// If the user moved the caret left after they started typing, the 'best' match may not match at all
// against the full text span that this item would be replacing.
if (!MatchesFilterText(bestFilterMatch, fullFilterText, completionRules, triggerInfo, reason))
{
return(false);
}
// There was either filter text, or this was a preselect match. In either case, we
// can hard select this.
return(true);
}
private static void ReplaceExistingItem(
CompletionItem item,
Dictionary<string, List<CompletionItem>> displayNameToItemsMap,
ICompletionRules completionRules)
{
// See if we have an item with
var sameNamedItems = displayNameToItemsMap.GetOrAdd(item.DisplayText, s_createList);
for (int i = 0; i < sameNamedItems.Count; i++)
{
var existingItem = sameNamedItems[i];
Contract.Assert(item.DisplayText == existingItem.DisplayText);
if (completionRules.ItemsMatch(item, existingItem).Value)
{
sameNamedItems[i] = Disambiguate(item, existingItem);
return;
}
}
sameNamedItems.Add(item);
}
private static CompletionList MergeAndPruneCompletionLists(IEnumerable<CompletionList> completionLists, ICompletionRules completionRules)
{
var displayNameToItemsMap = new Dictionary<string, List<CompletionItem>>();
CompletionItem builder = null;
foreach (var completionList in completionLists)
{
Contract.Assert(completionList != null);
foreach (var item in completionList.Items)
{
Contract.Assert(item != null);
// New items that match an existing item will replace it.
ReplaceExistingItem(item, displayNameToItemsMap, completionRules);
}
builder = builder ?? completionList.Builder;
}
if (displayNameToItemsMap.Count == 0)
{
return null;
}
// TODO(DustinCa): Revisit performance of this.
var totalItems = displayNameToItemsMap.Values.Flatten().ToList();
totalItems.Sort();
// TODO(DustinCa): This is lossy -- we lose the IsExclusive field. Fix that.
return new CompletionList(totalItems.ToImmutableArray(), builder);
}
private bool MatchesFilterText(
CompletionItem item,
string filterText,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason reason)
{
return completionRules.MatchesFilterText(item, filterText, triggerInfo, reason) ?? false;
}
private bool IsBetterFilterMatch(
CompletionItem item,
CompletionItem bestItem,
string filterText,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason filterReason)
{
return completionRules.IsBetterFilterMatch(item, bestItem, filterText, triggerInfo, filterReason) ?? false;
}
private bool IsHardSelection(
Model model,
CompletionItem bestFilterMatch,
ITextSnapshot textSnapshot,
ICompletionRules completionRules,
CompletionTriggerInfo triggerInfo,
CompletionFilterReason reason)
{
if (model.Builder != null)
{
return bestFilterMatch != null && bestFilterMatch.DisplayText == model.Builder.DisplayText;
}
if (bestFilterMatch == null || model.UseSuggestionCompletionMode)
{
return false;
}
// We don't have a builder and we have a best match. Normally this will be hard
// selected, except for a few cases. Specifically, if no filter text has been
// provided, and this is not a preselect match then we will soft select it. This
// happens when the completion list comes up implicitly and there is something in
// the MRU list. In this case we do want to select it, but not with a hard
// selection. Otherwise you can end up with the following problem:
//
// dim i as integer =<space>
//
// Completion will comes up after = with 'integer' selected (Because of MRU). We do
// not want 'space' to commit this.
var viewSpan = model.GetSubjectBufferFilterSpanInViewBuffer(bestFilterMatch.FilterSpan);
var fullFilterText = model.GetCurrentTextInSnapshot(viewSpan, textSnapshot, endPoint: null);
var shouldSoftSelect = completionRules.ShouldSoftSelectItem(GetExternallyUsableCompletionItem(bestFilterMatch), fullFilterText, triggerInfo);
if (shouldSoftSelect == true)
{
return false;
}
// If the user moved the caret left after they started typing, the 'best' match may not match at all
// against the full text span that this item would be replacing.
if (!MatchesFilterText(bestFilterMatch, fullFilterText, completionRules, triggerInfo, reason))
{
return false;
}
// There was either filter text, or this was a preselect match. In either case, we
// can hard select this.
return true;
}
