[antlr-interest] How do I get rid of "unexpected token:null" error

[sachin_sawant10]

I am using following grammer to parse JSP file. I want to read 
<i18n:img tags from the jsp page.

My grammer ---

class JSPParser extends Parser;

file:   (statement)+ 
	;

statement: (   WORD
             | STRING
	     | i:IMG {System.out.println("IMG Tag " + i.getText());}
      )
	;


class JSPLexer extends Lexer;
options {
	caseSensitive=false;
	k=7;
	filter=SCARF;
	charVocabulary='\3'..'\177';
}


IMG    
        :      	"<i18n:img" 
		(WS (ATTR)*)?       
		"/>"		
	;


protected
ATTR
options {
	ignore=WS;
}
	:	w:WORD '='
		(	s:STRING
		|	v:WORD
		)
	;

/** Match until next whitespace; can be file, int, etc... */
protected
WORD:	(
			options {
				generateAmbigWarnings=false;
			}
		:	'a'..'z' | '0'..'9' | '/' | '.' | '#' | '_'
		)+
	;

protected
STRING
	:	'"' (~'"')* '"'
	|	'\'' (~'\'')* '\''
	;


protected
WS	:	(	' '
		|	'\t'
		|	'\f'
		|	(	"\r\n"  // DOS
			|	'\r'    // Macintosh
			|	'\n'    // Unix (the right way)
			)
			{ newline(); }
		)
		
	;

protected
SCARF
	:	WS	// track line numbers while you scarf
	|	.
	;
-----------------------end of grammer --------------------------------

When I used the above grammer with any jsp files which does not 
have "<i18n:img" tag I get "unexpected token:null" error.  I also get 
the error when I use empty file as an input.

How do I get rid of it?

Regards

Sachin 




 

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