protected function doLevelSumRels(&$result)
{
$this->doLevelMulRels($result);
wfProfileIn(__METHOD__);
$ops = array('+', '-');
while ($this->mCur->type == AFPToken::TOp && in_array($this->mCur->value, $ops)) {
$op = $this->mCur->value;
$this->move();
$r2 = new AFPData();
$this->doLevelMulRels($r2);
if ($op == '+') {
$result = AFPData::sum($result, $r2);
}
if ($op == '-') {
$result = AFPData::sub($result, $r2);
}
}
wfProfileOut(__METHOD__);
}
