It could be something like that :

class JavaScriptParser extends Parser;

options {

k = 1; // tree
token lookahead

exportVocab = EDIstream; // Call its vocabulary "EDIstream"

defaultErrorHandler = false; // Don't generate parser error handlers

buildAST = true; // uses CommonAST by default

}

stream : (line)* ;

line : TAG (SEP TAG)* ENDLINE ;

class JavaScriptLexer extends Lexer;

options {

charVocabulary = '3'..'377';

exportVocab = EDIstream; // call the vocabulary "EDIstream"

k = 2; // Setting the lookahead deapth of the Lexer

}

// Space

WhiteSpace : ( ' ' | ' ' | 'f'
| ( "
" // DOS.
| '
' // Macintosh.
| '
' // Unix.
)
{ newline(); }
)
{ _ttype = Token.SKIP; } // to skip it.
;

ENDLINE : '~' { System.out.println("ENDLINE"); } ;
SEP : '*' { System.out.print("SEP"); } ;

TAG : ( ~('~' | '*' | ' ' | ' ' | '
' | '
' | 'f' ) )+
{ System.out.print("TAG("+$getText+")"); }
;