protected function countGroupOpen(Array $tokens)
	{
		return array_reduce($tokens, function ($carry, $item) {
			return $carry += $item instanceof Token\Group\Open;
		}, 0);
	}
protected function countGroupOpen(Array $tokens)
	{
		return array_reduce($tokens, function ($carry, $item) {
			return $carry += $item instanceof Token\Group\Open;
		}, 0);
	}
protected function countGroupOpen ( Array $ tokens ) { return array_reduce ( $ tokens , function ( $ carry , $ item ) { return $ carry += $ item instanceof Token \ Group \ Open ; } , 0 ) ; }
Counts the number of group-open tokens

@param  Jstewmc\Rtf\Token\Token  $tokens  the tokens to test
@return  int
@since  0.4.2
Counts the number of group - open tokens