private IList <ClassificationSpan> Classify(SnapshotSpan span)
{
List <ClassificationSpan> spans = new List <ClassificationSpan>();
if (span.IsEmpty)
{
return(spans);
}
var text = span.GetText();
var offset = 0;
int currentOffset;
NextComment:
foreach (Match match in new Regex(@"(?<Star>\*)?" + @"(?<Slashes>(?<!/)(/{2,}))[ \t\v\f]*" + @"(?<Comment>[^\n]*)").Matches(text))
{
var starOffset = 0;
if (match.Groups["Star"].Length > 0)
{
goto SkipComment;
}
var matchedSpan = new SnapshotSpan(span.Snapshot, new Span(span.Start + offset + starOffset + match.Index, match.Length - starOffset));
var intersections = _classifier.GetClassificationSpans(matchedSpan);
foreach (var Intersection in intersections)
{
var Classifications = Intersection.ClassificationType.Classification.Split(new[] { " - " }, StringSplitOptions.None);
// Comment must be classified as either "comment" or "XML Doc Comment".
if (!Utils.IsClassifiedAs(Classifications, new[] { PredefinedClassificationTypeNames.Comment, "XML Doc Comment" }))
{
goto SkipComment;
}
// Prevent recursive matching fragment of comment as another comment.
if (Utils.IsClassifiedAs(Classifications, new[] { "Comment.Default" })) //, "Comment.Triple" }))
{
goto SkipComment;
}
}
// Start offset of slashes (without star part: either "*" or "*/").
int SlashesStart = span.Start + offset + match.Groups["Slashes"].Index;
if (starOffset == 2)
{
SlashesStart += 1;
}
// Slashes length (optionally without first "/" as it's end of multiline comment).
var SlashesLength = match.Groups["Slashes"].Length;
if (starOffset == 2)
{
SlashesLength -= 1;
}
// If comment is triple slash (begins with "///").
var IsTripleSlash = SlashesLength == 3;
if (IsTripleSlash)
{
goto SkipComment;
}
var commentText = match.Groups["Comment"].Value;
int commentStart = span.Start + offset + match.Groups["Comment"].Index;
var skipInlineMatching = false;
for (int i = 0; i < PrefixManager.Count; i++)
{
var prefix = PrefixManager.GetPrefix(i);
if (commentText.ToLower().Trim().StartsWith(prefix.ToLower() + ":"))
{
spans.Add(new ClassificationSpan(new SnapshotSpan
(
span.Snapshot, new Span
(
SlashesStart,
commentText.Length + SlashesLength
)
), Comment_Todo));
skipInlineMatching = true;
}
}
if (skipInlineMatching)
{
goto FinishClassification;
}
FinishClassification:
currentOffset = match.Index + match.Length;
text = text.Substring(currentOffset);
offset += currentOffset;
goto NextComment;
SkipComment:
currentOffset =
match.Groups["Slashes"].Index
+ match.Groups["Slashes"].Length
;
text = text.Substring(currentOffset);
offset += currentOffset;
goto NextComment;
}
return(spans);
}
private static void InitDefaults()
{
PrefixManager.Add("todo", "temp", "tmp", "fixme");
}