public HighlightingDefinition AddSpan(string startExpression, string endExpression, FontOptions options)
 {
     return(AddSpan(startExpression, endExpression, options.ToHighlightingColor()));
 }
 public HighlightingDefinition AddRule(string expression, FontOptions options)
 {
     return(AddRule(expression, options.ToHighlightingColor()));
 }