Strip

As of ANTLR v3.1.2.
(copied from the release notes)

To strip a grammar down to just the grammar components do this:

$ java org.antlr.tool.Strip T.g

If T.g is:

grammar T;

options {k=1; output=AST;}

@header {kill}

@lexer::header {...}

@members {
akdsfljklas
}

z 
scope A;
	:	q=a[34] ids+=ID
	;

a[int i] returns [float f]
options {k=1;}
@init {rmoeve}
 : {sfkljlsf} B^ {on end}
 | '3' -> '3' {end}

   {aaa}
 ;

b
scope {
	String name;
}
 : B
    	-> {$arg!=null&&op!=null}?	^($op RULE_REF $arg)
    	-> 				^(RULE_REF $arg)
 ;

c : {true}? B | {false}?=> C ;

fragment A : '0' {skip();} ; // leave lexer actions
B : ~A
'z' ;

you'll get the following output

grammar T;

options {k=1; output=AST;}

z 

	:	a ID
	;

a 
options {k=1;}

 :  B 
 | '3' 
 ;

b

 : B
    	
    	
 ;

c : /*{true}?*/ B | /*{false}?=>*/ C ;

fragment A : '0' {skip();} ; // leave lexer actions
B : ~A
'z' ;

Strip - strip a grammar to just the grammar components

Strip