43      * @param string|int $rev empty string or revision timestamp
46     abstract protected function getFilename($rev = '');  argument
58      * @param int $rev timestamp of current page
61     public function isCurrentRevision($rev)  argument
63         return $rev == $this->currentRevision();
69      * @param int $rev revision timestamp
72     public function isLastRevision($rev = null)  argument
74         return $rev === $this->lastRevision();
132      * @param int $rev revision timestamp
150     public function getRevisionInfo($rev, $retrieveCurrentRevInfo = true)  argument
152         $rev = max(0, $rev);
153         if (!$rev) return false;
161         if (isset($this->cache[$this->id][$rev])) {
162             return $this->cache[$this->id][$rev];
166         [$fp, $lines] = $this->readloglines($rev);
177         return $this->cache[$this->id][$rev] ?? false;
315      * @param int $rev revision timestamp used as start date
323     public function getRelativeRevision($rev, $direction)  argument
325         $rev = max($rev, 0);
329         if (!$direction || ($direction > 0 && $this->isCurrentRevision($rev))) {
334         [$fp, $lines, $head, $tail, $eof] = $this->readloglines($rev);
357 …        if (($direction > 0 && $info['date'] > $rev) || ($direction < 0 && $info['date'] < $rev)) {
368                 && ($info['date'] == $rev || ($revCounter > 0 && !$relativeRev))
401                 $rev = $rev2;
403                 $rev1 = $rev;
462         } elseif ($rev = $this->getRelativeRevision($date_at + 1, -1)) {
464             return $rev;
477      * @param int $rev revision timestamp
489     protected function retrieveRevisionsAround($rev, $max)  argument
496         [$fp, $lines, $startHead, $startTail, $eof] = $this->readloglines($rev);
507                     if ($info['date'] >= $rev) {
691      * @param int $rev
693     public function traceCurrentRevision($rev)  argument
695         if ($rev > $this->lastRevision()) {
696             $rev = $this->currentRevision();
698         return $rev;