static SnapshotSpan AsSnapshotSpan(CommentRegion region, ITextSnapshot snapshot)
{
var startLine = snapshot.GetLineFromLineNumber(region.StartLine);
var endLine = snapshot.GetLineFromLineNumber(region.EndLine);
return(new SnapshotSpan(startLine.Start + region.StartOffset, endLine.End + region.EndOffset));
}
static IReadOnlyCollection <CommentRegion> GetComments(ITextSnapshot snapshot)
{
var results = new List <CommentRegion>();
CommentRegion current = null;
foreach (var line in snapshot.Lines)
{
var text = line.GetText();
for (int i = 0; i < text.Length; i++)
{
char c = text[i];
if (c == '/')
{
// already in comment, this won't break us out until we get a *
if (current != null)
{
continue;
}
// eager scan ahead by 1+ character (if not a match, won't matter anyway
if ((i + 1) < text.Length)
{
char n = text[++i];
// double forward slash means we can stop attempting to parse
if (n == '/')
{
break;
}
if (n == '*')
{
current = new CommentRegion
{
StartLine = line.LineNumber,
StartOffset = i - 1 // offset the ++
};
}
}
}
else if (c == '*')
{
// not in a comment, this won't matter
if (current == null)
{
continue;
}
if ((i + 1) < text.Length)
{
char n = text[++i];
if (n == '/')
{
// capture ending information, add to results and reset
current.EndLine = line.LineNumber;
current.EndOffset = i - 1; // offset the ++
results.Add(current);
current = null;
}
}
}
}
}
if (current != null)
{
var lastLine = snapshot.Lines.Last();
current.EndLine = lastLine.LineNumber;
current.EndOffset = lastLine.End.Position;
results.Add(current);
current = null;
}
return(results);
}
private static SnapshotSpan AsSnapshotSpan(CommentRegion region, ITextSnapshot snapshot)
{
return(new SnapshotSpan(snapshot, region.Start, region.Length));
}
