internal static CompletionSelectionStatus SelectBestMatch(this CompletionSet set, CompletionMatchType matchType, bool caseSensitive)
{
CompletionMatchResult matchedCompletions = set.MatchCompletionList(set.Completions, matchType, caseSensitive);
CompletionMatchResult matchedCompletionBuilders = set.MatchCompletionList(set.CompletionBuilders, matchType, caseSensitive);
int completionBuilderCount = 0;
if (matchedCompletionBuilders != null)
{
completionBuilderCount = (matchedCompletionBuilders.CharsMatchedCount + (matchedCompletionBuilders.SelectionStatus.IsSelected ? 1 : 0)) + (matchedCompletionBuilders.SelectionStatus.IsUnique ? 1 : 0);
}
int completionCount = 0;
if (matchedCompletions != null)
{
completionCount = (matchedCompletions.CharsMatchedCount + (matchedCompletions.SelectionStatus.IsSelected ? 1 : 0)) + (matchedCompletions.SelectionStatus.IsUnique ? 1 : 0);
}
if ((completionBuilderCount > completionCount) && (matchedCompletionBuilders != null))
{
set.SelectionStatus = matchedCompletionBuilders.SelectionStatus;
}
else if (matchedCompletions != null)
{
set.SelectionStatus = matchedCompletions.SelectionStatus;
}
else if (set.Completions.Count > 0)
{
if (!set.Completions.Contains(set.SelectionStatus.Completion))
{
set.SelectionStatus = new CompletionSelectionStatus(set.Completions[0], false, false);
}
}
else if (set.CompletionBuilders.Count > 0)
{
if (!set.CompletionBuilders.Contains(set.SelectionStatus.Completion))
{
set.SelectionStatus = new CompletionSelectionStatus(set.CompletionBuilders[0], false, false);
}
}
else
{
set.SelectionStatus = new CompletionSelectionStatus(null, false, false);
}
return(set.SelectionStatus);
}
private static CompletionMatchResult MatchCompletionList(this CompletionSet set, IList<Completion> completionList, CompletionMatchType matchType, bool caseSensitive)
{
if (set.ApplicableTo == null)
{
throw new InvalidOperationException("Cannot match completion set with no applicability span.");
}
ITextSnapshot currentSnapshot = set.ApplicableTo.TextBuffer.CurrentSnapshot;
string text = set.ApplicableTo.GetText(currentSnapshot);
if (text.Length != 0)
{
Completion bestMatch = null;
int maxMatchPosition = -1;
bool isUnique = false;
bool isSelected = false;
foreach (Completion currentCompletion in completionList)
{
string displayText = string.Empty;
if (matchType == CompletionMatchType.MatchDisplayText)
{
displayText = currentCompletion.DisplayText;
}
else if (matchType == CompletionMatchType.MatchInsertionText)
{
displayText = currentCompletion.InsertionText;
}
int matchPositionCount = 0;
for (int i = 0; i < text.Length; i++)
{
if (i >= displayText.Length)
{
break;
}
char textChar = text[i];
char displayTextChar = displayText[i];
if (!caseSensitive)
{
textChar = char.ToLowerInvariant(textChar);
displayTextChar = char.ToLowerInvariant(displayTextChar);
}
if (textChar != displayTextChar)
{
break;
}
matchPositionCount++;
}
if (matchPositionCount > maxMatchPosition)
{
maxMatchPosition = matchPositionCount;
bestMatch = currentCompletion;
isUnique = true;
if ((matchPositionCount == text.Length) && (maxMatchPosition > 0))
{
isSelected = true;
}
}
else if (matchPositionCount == maxMatchPosition)
{
isUnique = false;
if (isSelected)
{
break;
}
}
}
if (bestMatch != null)
{
CompletionMatchResult result = new CompletionMatchResult();
result.SelectionStatus = new CompletionSelectionStatus(bestMatch, isSelected, isUnique);
result.CharsMatchedCount = (maxMatchPosition >= 0) ? maxMatchPosition : 0;
return result;
}
}
return null;
}
private static int GetMatchWeight(CompletionMatchResult builderResult)
{
return (builderResult.CharsMatchedCount) +
(builderResult.SelectionStatus.IsSelected ? 1 : 0) +
(builderResult.SelectionStatus.IsUnique ? 1 : 0);
}
private static CompletionMatchResult MatchCompletionList(this CompletionSet set, IList <Completion> completionList, CompletionMatchType matchType, bool caseSensitive)
{
if (set.ApplicableTo == null)
{
throw new InvalidOperationException("Cannot match completion set with no applicability span.");
}
ITextSnapshot currentSnapshot = set.ApplicableTo.TextBuffer.CurrentSnapshot;
string text = set.ApplicableTo.GetText(currentSnapshot);
if (text.Length != 0)
{
Completion bestMatch = null;
int maxMatchPosition = -1;
bool isUnique = false;
bool isSelected = false;
foreach (Completion currentCompletion in completionList)
{
string displayText = string.Empty;
if (matchType == CompletionMatchType.MatchDisplayText)
{
displayText = currentCompletion.DisplayText;
}
else if (matchType == CompletionMatchType.MatchInsertionText)
{
displayText = currentCompletion.InsertionText;
}
int matchPositionCount = 0;
for (int i = 0; i < text.Length; i++)
{
if (i >= displayText.Length)
{
break;
}
char textChar = text[i];
char displayTextChar = displayText[i];
if (!caseSensitive)
{
textChar = char.ToLowerInvariant(textChar);
displayTextChar = char.ToLowerInvariant(displayTextChar);
}
if (textChar != displayTextChar)
{
break;
}
matchPositionCount++;
}
if (matchPositionCount > maxMatchPosition)
{
maxMatchPosition = matchPositionCount;
bestMatch = currentCompletion;
isUnique = true;
if ((matchPositionCount == text.Length) && (maxMatchPosition > 0))
{
isSelected = true;
}
}
else if (matchPositionCount == maxMatchPosition)
{
isUnique = false;
if (isSelected)
{
break;
}
}
}
if (bestMatch != null)
{
CompletionMatchResult result = new CompletionMatchResult();
result.SelectionStatus = new CompletionSelectionStatus(bestMatch, isSelected, isUnique);
result.CharsMatchedCount = (maxMatchPosition >= 0) ? maxMatchPosition : 0;
return(result);
}
}
return(null);
}
private static int GetMatchWeight(CompletionMatchResult builderResult)
{
return((builderResult.CharsMatchedCount) +
(builderResult.SelectionStatus.IsSelected ? 1 : 0) +
(builderResult.SelectionStatus.IsUnique ? 1 : 0));
}
/// <summary>
/// Redetermines the best matching completion in the completion set.
/// </summary>
/// <param name="matchType">The <see cref="CompletionMatchType"/>.</param>
/// <param name="caseSensitive"><c>true</c> if the match is case-sensitive, otherwise <c>false</c>.</param>
protected void SelectBestMatch(CompletionMatchType matchType, bool caseSensitive)
{
CompletionMatchResult completionMatch = this.MatchCompletionList
(
this.Completions,
matchType,
caseSensitive
);
CompletionMatchResult builderMatch = this.MatchCompletionList
(
this.CompletionBuilders,
matchType,
caseSensitive
);
// Only select a builder if it's far-and-away better. Otherwise, select a completion
int builderScore = 0;
if (builderMatch != null)
{
builderScore =
builderMatch.CharsMatchedCount +
(builderMatch.SelectionStatus.IsSelected ? 1 : 0) +
(builderMatch.SelectionStatus.IsUnique ? 1 : 0);
}
int completionScore = 0;
if (completionMatch != null)
{
completionScore =
completionMatch.CharsMatchedCount +
(completionMatch.SelectionStatus.IsSelected ? 1 : 0) +
(completionMatch.SelectionStatus.IsUnique ? 1 : 0);
}
if ((builderScore > completionScore) && (builderMatch != null))
{
this.SelectionStatus = builderMatch.SelectionStatus;
}
else if (completionMatch != null)
{
this.SelectionStatus = completionMatch.SelectionStatus;
}
else if (this.Completions.Count > 0)
{
// If we've already got a pretty good selection, just leave it selected, but not fully-selected.
if (this.Completions.Contains(this.SelectionStatus.Completion))
{
this.SelectionStatus = new CompletionSelectionStatus(this.SelectionStatus.Completion, false, false);
}
else
{
this.SelectionStatus = new CompletionSelectionStatus(this.Completions[0], false, false);
}
}
else if (this.CompletionBuilders.Count > 0)
{
// If we've already got a pretty good selection, just leave it selected, but not fully-selected.
if (this.CompletionBuilders.Contains(this.SelectionStatus.Completion))
{
this.SelectionStatus = new CompletionSelectionStatus(this.SelectionStatus.Completion, false, false);
}
else
{
this.SelectionStatus = new CompletionSelectionStatus(this.CompletionBuilders[0], false, false);
}
}
else
{
this.SelectionStatus = new CompletionSelectionStatus(null, false, false);
}
}
