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<?php
/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
namespace Icinga\Util;
use ArrayIterator;
use InvalidArgumentException;
use RecursiveIterator;
/**
* Iterator for traversing a directory
*/
class DirectoryIterator implements RecursiveIterator
{
/**
* Iterate files first
*
* @var int
*/
const FILES_FIRST = 1;
/**
* Current directory item
*
* @var string|false
*/
private $current;
/**
* The file extension to filter for
*
* @var string
*/
protected $extension;
/**
* Scanned files
*
* @var ArrayIterator
*/
private $files;
/**
* Iterator flags
*
* @var int
*/
protected $flags;
/**
* Current key
*
* @var string|false
*/
private $key;
/**
* The path of the directory to traverse
*
* @var string
*/
protected $path;
/**
* Directory queue if FILES_FIRST flag is set
*
* @var array
*/
private $queue;
/**
* Whether to skip empty files
*
* Defaults to true.
*
* @var bool
*/
protected $skipEmpty = true;
/**
* Whether to skip hidden files
*
* Defaults to true.
*
* @var bool
*/
protected $skipHidden = true;
/**
* Create a new directory iterator from path
*
* The given path will not be validated whether it is readable. Use {@link isReadable()} before creating a new
* directory iterator instance.
*
* @param string $path The path of the directory to traverse
* @param string $extension The file extension to filter for. A leading dot is optional
* @param int $flags Iterator flags
*/
public function __construct($path, $extension = null, $flags = null)
{
if (empty($path)) {
throw new InvalidArgumentException('The path can\'t be empty');
}
$this->path = $path;
if (! empty($extension)) {
$this->extension = '.' . ltrim($extension, '.');
}
if ($flags !== null) {
$this->flags = $flags;
}
}
/**
* Check whether the given path is a directory and is readable
*
* @param string $path The path of the directory
*
* @return bool
*/
public static function isReadable($path)
{
return is_dir($path) && is_readable($path);
}
public function hasChildren(): bool
{
return static::isReadable($this->current);
}
public function getChildren(): DirectoryIterator
{
return new static($this->current, $this->extension, $this->flags);
}
#[\ReturnTypeWillChange]
public function current()
{
return $this->current;
}
public function next(): void
{
$path = null;
do {
$this->files->next();
$skip = false;
if (! $this->files->valid()) {
$file = false;
$path = false;
break;
} else {
$file = $this->files->current();
do {
if ($this->skipHidden && $file[0] === '.') {
$skip = true;
break;
}
$path = $this->path . '/' . $file;
if (is_dir($path)) {
if ($this->flags & static::FILES_FIRST === static::FILES_FIRST) {
$this->queue[] = array($path, $file);
$skip = true;
}
break;
}
if ($this->skipEmpty && ! filesize($path)) {
$skip = true;
break;
}
if ($this->extension && ! StringHelper::endsWith($file, $this->extension)) {
$skip = true;
break;
}
} while (0);
}
} while ($skip);
/** @noinspection PhpUndefinedVariableInspection */
if ($path === false && ! empty($this->queue)) {
list($path, $file) = array_shift($this->queue);
}
$this->current = $path;
$this->key = $file;
}
#[\ReturnTypeWillChange]
public function key()
{
return $this->key;
}
public function valid(): bool
{
return $this->current !== false;
}
public function rewind(): void
{
if ($this->files === null) {
$files = scandir($this->path);
natcasesort($files);
$this->files = new ArrayIterator($files);
}
$this->files->rewind();
$this->queue = array();
$this->next();
}
}
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