Gitonomy\Git\Repository::getRevision PHP Method

    public function getRevision($name)
    {
        return new Revision($this, $name);
    }

 /**
  * Constructs a revision list from a variety of types.
  *
  * @param mixed $revisions can be a string, an array of strings or an array of Revision, Branch, Tag, Commit
  */
 public function __construct(Repository $repository, $revisions)
 {
     if (is_string($revisions)) {
         $revisions = array($repository->getRevision($revisions));
     } elseif ($revisions instanceof Revision) {
         $revisions = array($revisions);
     } elseif (!is_array($revisions)) {
         throw new \InvalidArgumentException(sprintf('Expected a string, a Revision or an array, got a "%s".', is_object($revisions) ? get_class($revisions) : gettype($revisions)));
     }
     if (count($revisions) == 0) {
         throw new \InvalidArgumentException(sprintf("Empty revision list not allowed"));
     }
     foreach ($revisions as $i => $revision) {
         if (is_string($revision)) {
             $revisions[$i] = new Revision($repository, $revision);
         } elseif (!$revision instanceof Revision) {
             throw new \InvalidArgumentException(sprintf('Expected a "Revision", got a "%s".', is_object($revision) ? get_class($revision) : gettype($revision)));
         }
     }
     $this->revisions = $revisions;
 }