private function parseOperand (){

		$negate = false;
		$offset = $this->pos+1;
		if( $offset >= $this->input_len ){
			return;
		}
		$char = $this->input[$offset];
		if( $char === '@' || $char === '(' ){
			$negate = $this->MatchChar('-');
		}

		$o = $this->MatchFuncs(array('parseSub','parseEntitiesDimension','parseEntitiesColor','parseEntitiesVariable','parseEntitiesCall'));

		if( $negate ){
			$o->parensInOp = true;
			$o = $this->NewObj1('Less_Tree_Negative',$o);
		}

		return $o;
	}