59                     $idx = ($wid < count($index)) ? $index[$wid] : '';
60                     $index[$wid] = $this->updateTuple($idx, $pid, $freq);
992      * @param string    $idx    name of the index
998     protected function getIndex($idx, $suffix)  argument
1001         $fn = $conf['indexdir'] . '/' . $idx . $suffix . '.idx';
1009      * @param string    $idx    name of the index
1016     protected function saveIndex($idx, $suffix, &$lines)  argument
1019         $fn = $conf['indexdir'] . '/' . $idx . $suffix;
1035      * @param string    $idx    name of the index
1042     protected function getIndexKey($idx, $suffix, $id)  argument
1045         $fn = $conf['indexdir'] . '/' . $idx . $suffix . '.idx';
1060      * @param string    $idx    name of the index
1068     protected function saveIndexKey($idx, $suffix, $id, $line)  argument
1073         $fn = $conf['indexdir'] . '/' . $idx . $suffix;
1104      * @param string    $idx    name of the index
1111     protected function addIndexKey($idx, $suffix, $value)  argument
1113         $index = $this->getIndex($idx, $suffix);
1118             if (!$this->saveIndex($idx, $suffix, $index)) {
1119                 throw new \RuntimeException("Failed to write $idx index");
1154         $idx = [];
1160                     $idx[] = $key;
1167                     $idx[] = $length;
1170         return $idx;