public string HighlightAsRtf(Dictionary <string, Color> colorDictionary, Color defaultColor, string rtfTemplate)
{
var highlightJobs = ApplyDescriptors(SourceCode, 0, Descriptors);
var rb = new RTFBuilder(rtfTemplate);
var highlightedTextLength = ConvertHighlightJobsToRichTextFormat(rb, highlightJobs, 0, colorDictionary, defaultColor);
var leftOver = SourceCode.Length - highlightedTextLength;
if (leftOver > 0)
{
rb.Append(SourceCode.Substring(highlightedTextLength, leftOver), defaultColor);
}
return(rb.ToString());
}
// returns length of characters highlighted.
private int ConvertHighlightJobsToRichTextFormat(RTFBuilder builder, IEnumerable <HighlightJob> jobs, int startIndex, Dictionary <string, Color> colorDictionary, Color parentColor)
{
var currentIndex = startIndex;
foreach (var job in jobs)
{
CancellationToken?.ThrowIfCancellationRequested();
if (job.StartIndex != currentIndex)
{
builder.Append(SourceCode.Substring(currentIndex, job.StartIndex - currentIndex), parentColor);
currentIndex = job.StartIndex;
}
if (!colorDictionary.TryGetValue(job.ColorKey, out var color))
{
color = parentColor;
}
if (job.ChildJobs != null)
{
currentIndex += ConvertHighlightJobsToRichTextFormat(builder, job.ChildJobs, currentIndex, colorDictionary, color);
var leftOver = job.StartIndex + job.Length - currentIndex;
if (leftOver > 0)
{
builder.Append(SourceCode.Substring(currentIndex, leftOver), color);
currentIndex += leftOver;
}
}
else
{
builder.Append(SourceCode.Substring(currentIndex, job.Length), color);
currentIndex += job.Length;
}
}
return(currentIndex - startIndex);
}