/**
* Find previous file in current chapter
*
* @return array
*/
public function findPrevious()
{
if (!isset($this->cache['docbook_previous'])) {
$this->cache['docbook_previous'] = null;
$filepath = $this->getPathname();
if ($this->isLink() || $this->isRootLink()) {
$filepath = DirectoryHelper::slashDirname($this->getWebPath()) . $this->getFilename();
}
$dir_realpath = dirname(realpath($filepath));
$dir_targetpath = dirname($filepath);
if (empty($dir_realpath)) {
$dir_realpath = $dir_targetpath;
}
$dir = new FilesystemIterator($dir_realpath, FilesystemIterator::CURRENT_AS_PATHNAME);
$dir_table = iterator_to_array($dir, false);
$i = array_search($this->getRealPath(), $dir_table);
if (false !== $i) {
$j = $i - 1;
while ($j >= 0 && array_key_exists($j, $dir_table) && (is_dir($dir_table[$j]) && !Helper::isDirValid($dir_table[$j]) || !Helper::isFileValid($dir_table[$j]) || DirectoryHelper::isDotPath($dir_table[$j]) || Helper::isTranslationFile($dir_table[$j]))) {
$j = $j - 1;
}
if ($j >= 0 && array_key_exists($j, $dir_table) && (is_dir($dir_table[$j]) && Helper::isDirValid($dir_table[$j]) || !is_dir($dir_table[$j]) && Helper::isFileValid($dir_table[$j]) && !Helper::isTranslationFile($dir_table[$j])) && !DirectoryHelper::isDotPath($dir_table[$j])) {
$previous = new DocBookFile($dir_table[$j]);
$this->cache['docbook_previous'] = $previous->getDocBookStack();
}
}
}
return $this->cache['docbook_previous'];
}
