Tagger

// Loop through the snapshot ranges
foreach (TextSnapshotRange snapshotRange in snapshotRanges)
{
    // If the snapshot range is not zero-length...
    if (!snapshotRange.IsZeroLength)
    {
        // Get a snapshot reader
        ITextSnapshotReader reader = snapshotRange.Snapshot.GetReader(snapshotRange.StartOffset);

        // If not already at the start of a line, back up to the start
        if (!reader.IsAtSnapshotLineStart)
        {
            reader.GoToCurrentSnapshotLineStart();
        }

        // Read through the snapshot until the end of the target range is reached
        while ((!reader.IsAtSnapshotEnd) && (reader.Offset < snapshotRange.EndOffset))
        {
            // Save the start of the line offset
            int lineStartOffset = reader.Offset;

            // Go to the end of the line
            reader.GoToCurrentSnapshotLineEnd();

            // Save the end of the line offset
            int lineEndOffset = reader.Offset;

            // Query our breakpoint list to see if we have a breakpoint at this position
            DebuggerBreakPoint bp = this.debugpoints.FirstOrDefault(s => s.StartOffset == lineStartOffset && s.EndOffset == lineEndOffset);

            if (null != bp)
            {
                // Create a new tag from the breakpoint
                BreakPointTag tag = new BreakPointTag(bp);

                // Yield the tag
                yield return new TagSnapshotRange<BreakPointTag>(
                    TextSnapshotRange.FromSpan(snapshotRange.Snapshot, snapshotRange.StartOffset, snapshotRange.Text.Length), tag);
            }

            // Consume the newline
            reader.GoToNextSnapshotLineStart();
        }
    }
}