User:OrenBochman/ParserNG/Sanitizer Antlr

Sanitizer Filter Antlr

"To make ANTLR generate lexers that behave like the UNIX utility sed (copy standard in to standard out except as specified by the replace patterns), use a filter rule that does the input to output copying:" - antlr docs [1]

class cfgSed extends Lexer;
options {
  k=2;
  filter=IGNORE;
  charVocabulary = '\3'..'\177';
}

FORM  : "<FORM>" 
        { System.out.print("<!-- &gt; FORM &lt; -->"); // filter output
          System.err.print(String.format("munged illegal tag <FORM> at %d,%d",cfgSed.line,cfgSed.column)); // error message
        }
        ;
STYLE : "<STYLE>" 
        { System.out.print("<!-- &gt; style &lt; -->");
          System.err.print("munged illegal tag <Style>");
        }
        ;

protected
IGNORE
  :  ( "\r\n" | '\r' | '\n' )
     {newline(); System.out.println("");}
  |  c:. {System.out.print(c);}
  ;

based on [2]