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<?php
/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
namespace Icinga\Util;
use stdClass;
/**
* GLOB-like filter for simple data structures
*
* e.g. this filters:
*
* foo.bar.baz
* foo.b*r.baz
* **.baz
*
* match this one:
*
* array(
* 'foo' => array(
* 'bar' => array(
* 'baz' => 'deadbeef' // <---
* )
* )
* )
*/
class GlobFilter
{
/**
* The prepared filters
*
* @var array
*/
protected $filters;
/**
* Create a new filter from a comma-separated list of GLOB-like filters or an array of such lists.
*
* @param string|\Traversable|iterable $filters
*/
public function __construct($filters)
{
$patterns = array(array(''));
$lastIndex1 = $lastIndex2 = 0;
foreach ((is_string($filters) ? array($filters) : $filters) as $rawPatterns) {
$escape = false;
foreach (str_split($rawPatterns) as $c) {
if ($escape) {
$escape = false;
$patterns[$lastIndex1][$lastIndex2] .= preg_quote($c, '/');
} else {
switch ($c) {
case '\\':
$escape = true;
break;
case ',':
$patterns[] = array('');
++$lastIndex1;
$lastIndex2 = 0;
break;
case '.':
$patterns[$lastIndex1][] = '';
++$lastIndex2;
break;
case '*':
$patterns[$lastIndex1][$lastIndex2] .= '.*';
break;
default:
$patterns[$lastIndex1][$lastIndex2] .= preg_quote($c, '/');
}
}
}
if ($escape) {
$patterns[$lastIndex1][$lastIndex2] .= '\\\\';
}
}
$this->filters = array();
foreach ($patterns as $pattern) {
foreach ($pattern as $i => $subPattern) {
if ($subPattern === '') {
unset($pattern[$i]);
} elseif ($subPattern === '.*.*') {
$pattern[$i] = '**';
} elseif ($subPattern === '.*') {
$pattern[$i] = '/^' . $subPattern . '$/';
} else {
$pattern[$i] = '/^' . trim($subPattern) . '$/i';
}
}
if (! empty($pattern)) {
$found = false;
foreach ($pattern as $i => $v) {
if ($found) {
if ($v === '**') {
unset($pattern[$i]);
} else {
$found = false;
}
} elseif ($v === '**') {
$found = true;
}
}
if (end($pattern) === '**') {
$pattern[] = '/^.*$/';
}
$this->filters[] = array_values($pattern);
}
}
}
/**
* Remove all keys/attributes matching any of $this->filters from $dataStructure
*
* @param stdClass|array $dataStructure
*
* @return stdClass|array The modified copy of $dataStructure
*/
public function removeMatching($dataStructure)
{
foreach ($this->filters as $filter) {
$dataStructure = static::removeMatchingRecursive($dataStructure, $filter);
}
return $dataStructure;
}
/**
* Helper method for removeMatching()
*
* @param stdClass|array $dataStructure
* @param array $filter
*
* @return stdClass|array
*/
protected static function removeMatchingRecursive($dataStructure, $filter)
{
$multiLevelPattern = $filter[0] === '**';
if ($multiLevelPattern) {
$dataStructure = static::removeMatchingRecursive($dataStructure, array_slice($filter, 1));
}
$isObject = $dataStructure instanceof stdClass;
if ($isObject || is_array($dataStructure)) {
if ($isObject) {
$dataStructure = (array) $dataStructure;
}
if ($multiLevelPattern) {
foreach ($dataStructure as $k => & $v) {
$v = static::removeMatchingRecursive($v, $filter);
unset($v);
}
} else {
$currentLevel = $filter[0];
$nextLevels = count($filter) === 1 ? null : array_slice($filter, 1);
foreach ($dataStructure as $k => & $v) {
if (preg_match($currentLevel, (string) $k)) {
if ($nextLevels === null) {
unset($dataStructure[$k]);
} else {
$v = static::removeMatchingRecursive($v, $nextLevels);
}
}
unset($v);
}
}
if ($isObject) {
$dataStructure = (object) $dataStructure;
}
}
return $dataStructure;
}
}
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