anchor.diff:  }
   	:	'while' '(' expr ')' '{' block '}'
   		{
  -			tabs.addTab();
  -			$name = "while(" + $expr.name + ") {\n" + tabs.tab()  + $block.name + tabs.tab() + "}";
  +			
  +			$name = "while(" + $expr.name + ") {\n" + "\t"  + $block.name + "\t" + "}";
   			
   		}
   	;
  
positive.code: }
  	:	'for' '(' forPara ';' expr ';' normalExp ')' '{' block '}'
  		{
  			tabs.addTab();
  			$name = "for(" + $forPara.name + "; " + $expr.name + "; " + $normalExp.name + ") {\n" + tabs.tab() + $block.name +  tabs.tab() + "}";
  			
  		}
  	;
  
negative.code: 	name = null;
  }
  	:	'if' '(' exprvalue ')' '{' block '}'
  		{$name = "if(" + $exprvalue.name + ") {" + "\n" + "\t" +  $block.name + "\t" + "}";}
  	;
  	
  elsePart returns [String name]
  