public override TokenStream Create(TokenStream input)
 {
     if (pattern != null)
     {
         input = new PatternKeywordMarkerFilter(input, pattern);
     }
     if (protectedWords != null)
     {
         input = new SetKeywordMarkerFilter(input, protectedWords);
     }
     return input;
 }
 public override TokenStream Create(TokenStream input)
 {
     if (pattern != null)
     {
         input = new PatternKeywordMarkerFilter(input, pattern);
     }
     if (protectedWords != null)
     {
         input = new SetKeywordMarkerFilter(input, protectedWords);
     }
     return(input);
 }