public bool TryGetApplicableToSpan(char typedChar, SnapshotPoint triggerPt, out SnapshotSpan applicableToSpan, CancellationToken token)
{
ThreadHelper.ThrowIfNotOnUIThread();
_mode = CompletionMode.None;
_fileName = VsTextUtil.TryGetDocumentFileName(_textView.TextBuffer);
_appSettings = ProbeEnvironment.CurrentAppSettings;
var tracker = Classifier.TextBufferStateTracker.GetTrackerForTextBuffer(triggerPt.Snapshot.TextBuffer);
var state = tracker.GetStateForPosition(triggerPt, _fileName, _appSettings);
if (Classifier.State.IsInLiveCode(state))
{
Match match;
var line = triggerPt.Snapshot.GetLineFromPosition(triggerPt.Position);
var prefix = line.GetTextUpToPosition(triggerPt);
if (typedChar == ' ')
{
#region Assignment or Comparison
if ((match = _rxAfterAssignOrCompare.Match(prefix)).Success)
{
_mode = CompletionMode.AfterAssignOrCompare;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
_params.pt = new SnapshotPoint(line.Snapshot, match.Groups[1].Index + line.Start.Position);
return(true);
}
#endregion
#region #ifdef
else if ((match = _rxAfterIfDef.Match(prefix)).Success)
{
_mode = CompletionMode.AfterIfDef;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
#region Comma
else if (prefix.EndsWith(", "))
{
_mode = CompletionMode.AfterComma;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
#region order by
else if ((match = _rxOrderBy.Match(prefix)).Success)
{
_mode = CompletionMode.AfterOrderBy;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
#region After Word
else if ((match = _rxAfterWord.Match(prefix)).Success)
{
switch (match.Groups[1].Value)
{
case "case":
_mode = CompletionMode.AfterCase;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
case "extract":
_mode = CompletionMode.AfterExtract;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
return(true);
case "return":
_mode = CompletionMode.AfterReturn;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
case "tag":
_mode = CompletionMode.AfterTag;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
default:
_mode = CompletionMode.AfterWord;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
_params.snapshot = triggerPt.Snapshot;
return(true);
}
}
#endregion
#region After Symbol
else if ((match = _rxAfterSymbol.Match(prefix)).Success)
{
_mode = CompletionMode.AfterSymbol;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
#region After Number
else if ((match = _rxAfterNumber.Match(prefix)).Success)
{
_mode = CompletionMode.AfterNumber;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
#region After String Literal
else if ((match = _rxAfterStringLiteral.Match(prefix)).Success)
{
_mode = CompletionMode.AfterStringLiteral;
applicableToSpan = triggerPt.ToSnapshotSpan();
return(true);
}
#endregion
}
#region Table.Field
else if ((match = _rxTypingTable.Match(prefix)).Success)
{
_mode = CompletionMode.DotSeparatedWords;
applicableToSpan = new SnapshotSpan(triggerPt.Snapshot, match.Groups[2].Index + line.Start.Position, match.Groups[2].Length);
_params.str = match.Groups[1].Value;
_params.str2 = match.Groups[2].Value;
return(true);
}
#endregion
#region Word
else if ((match = _rxTypingWord.Match(prefix)).Success)
{
// Typing a regular word.
_mode = CompletionMode.Word;
_params.pt = new SnapshotPoint(triggerPt.Snapshot, line.Start.Position + match.Index);
applicableToSpan = new SnapshotSpan(_params.pt, match.Length);
return(true);
}
#endregion
#region Class function bracket
else if ((match = _rxClassFunctionStartBracket.Match(prefix)).Success)
{
_mode = CompletionMode.ClassFunction;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
_params.str2 = match.Groups[2].Value;
return(true);
}
#endregion
#region Function bracket
else if ((match = _rxFunctionStartBracket.Match(prefix)).Success)
{
_mode = CompletionMode.Function;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
return(true);
}
#endregion
#region #include
else if ((match = _rxAfterInclude.Match(prefix)).Success)
{
_mode = CompletionMode.Include;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
return(true);
}
#endregion
}
else
{
if ((state & State.StringLiteral_Mask) != 0)
{
Match match;
var line = triggerPt.Snapshot.GetLineFromPosition(triggerPt.Position);
var prefix = line.GetTextUpToPosition(triggerPt);
#region #include (for string literal)
if ((match = _rxAfterInclude.Match(prefix)).Success)
{
_mode = CompletionMode.Include;
applicableToSpan = triggerPt.ToSnapshotSpan();
_params.str = match.Groups[1].Value;
return(true);
}
#endregion
}
}
applicableToSpan = new SnapshotSpan(triggerPt.Snapshot, new Span(0, 0));
return(false);
}