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MultiplePcreFilterIterator.php
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MultiplePcreFilterIterator.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Finder\Iterator;
/**
* MultiplePcreFilterIterator filters files using patterns (regexps, globs or strings).
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class MultiplePcreFilterIterator extends FilterIterator
{
protected $matchRegexps;
protected $noMatchRegexps;
/**
* Constructor.
*
* @param \Iterator $iterator The Iterator to filter
* @param array $matchPatterns An array of patterns that need to match
* @param array $noMatchPatterns An array of patterns that need to not match
*/
public function __construct(\Iterator $iterator, array $matchPatterns, array $noMatchPatterns)
{
$this->matchRegexps = array();
foreach ($matchPatterns as $pattern) {
$this->matchRegexps[] = $this->toRegex($pattern);
}
$this->noMatchRegexps = array();
foreach ($noMatchPatterns as $pattern) {
$this->noMatchRegexps[] = $this->toRegex($pattern);
}
parent::__construct($iterator);
}
/**
* Checks whether the string is a regex.
*
* @param string $str
*
* @return Boolean Whether the given string is a regex
*/
protected function isRegex($str)
{
if (preg_match('/^(.{3,}?)[imsxuADU]*$/', $str, $m)) {
$start = substr($m[1], 0, 1);
$end = substr($m[1], -1);
if ($start === $end) {
return !preg_match('/[*?[:alnum:] \\\\]/', $start);
}
if ($start === '{' && $end === '}') {
return true;
}
}
return false;
}
/**
* Converts string into regexp.
*
* @param string $str Pattern
*
* @return string regexp corresponding to a given string
*/
abstract protected function toRegex($str);
}