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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 = [];
/**
* @param \Iterator $iterator The Iterator to filter
* @param string[] $matchPatterns An array of patterns that need to match
* @param string[] $noMatchPatterns An array of patterns that need to not match
*/
public function __construct(\Iterator $iterator, array $matchPatterns, array $noMatchPatterns)
{
foreach ($matchPatterns as $pattern) {
$this->matchRegexps[] = $this->toRegex($pattern);
}
foreach ($noMatchPatterns as $pattern) {
$this->noMatchRegexps[] = $this->toRegex($pattern);
}
parent::__construct($iterator);
}
/**
* Checks whether the string is accepted by the regex filters.
*
* If there is no regexps defined in the class, this method will accept the string.
* Such case can be handled by child classes before calling the method if they want to
* apply a different behavior.
*
* @return bool
*/
protected function isAccepted(string $string)
{
// should at least not match one rule to exclude
foreach ($this->noMatchRegexps as $regex) {
if (preg_match($regex, $string)) {
return false;
}
}
// should at least match one rule
if ($this->matchRegexps) {
foreach ($this->matchRegexps as $regex) {
if (preg_match($regex, $string)) {
return true;
}
}
return false;
}
// If there is no match rules, the file is accepted
return true;
}
/**
* Checks whether the string is a regex.
*
* @return bool
*/
protected function isRegex(string $str)
{
if (preg_match('/^(.{3,}?)[imsxuADU]*$/', $str, $m)) {
$start = substr($m[1], 0, 1);
$end = substr($m[1], -1);
if ($start === $end) {
return !preg_match('/[*?[:alnum:] \\\\]/', $start);
}
foreach ([['{', '}'], ['(', ')'], ['[', ']'], ['<', '>']] as $delimiters) {
if ($start === $delimiters[0] && $end === $delimiters[1]) {
return true;
}
}
}
return false;
}
/**
* Converts string into regexp.
*
* @return string
*/
abstract protected function toRegex(string $str);
}