<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Finder\Iterator;
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/**
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* MultiplePcreFilterIterator filters files using patterns (regexps, globs or strings).
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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abstract class MultiplePcreFilterIterator extends \FilterIterator
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{
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protected $matchRegexps = [];
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protected $noMatchRegexps = [];
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/**
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* @param \Iterator $iterator The Iterator to filter
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* @param array $matchPatterns An array of patterns that need to match
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* @param array $noMatchPatterns An array of patterns that need to not match
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*/
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public function __construct(\Iterator $iterator, array $matchPatterns, array $noMatchPatterns)
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{
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foreach ($matchPatterns as $pattern) {
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$this->matchRegexps[] = $this->toRegex($pattern);
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}
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foreach ($noMatchPatterns as $pattern) {
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$this->noMatchRegexps[] = $this->toRegex($pattern);
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}
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parent::__construct($iterator);
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}
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/**
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* Checks whether the string is accepted by the regex filters.
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*
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* If there is no regexps defined in the class, this method will accept the string.
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* Such case can be handled by child classes before calling the method if they want to
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* apply a different behavior.
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*
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* @param string $string The string to be matched against filters
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*
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* @return bool
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*/
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protected function isAccepted($string)
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{
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// should at least not match one rule to exclude
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foreach ($this->noMatchRegexps as $regex) {
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if (preg_match($regex, $string)) {
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return false;
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}
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}
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// should at least match one rule
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if ($this->matchRegexps) {
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foreach ($this->matchRegexps as $regex) {
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if (preg_match($regex, $string)) {
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return true;
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}
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}
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return false;
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}
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// If there is no match rules, the file is accepted
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return true;
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}
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/**
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* Checks whether the string is a regex.
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*
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* @param string $str
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*
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* @return bool Whether the given string is a regex
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*/
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protected function isRegex($str)
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{
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if (preg_match('/^(.{3,}?)[imsxuADU]*$/', $str, $m)) {
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$start = substr($m[1], 0, 1);
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$end = substr($m[1], -1);
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if ($start === $end) {
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return !preg_match('/[*?[:alnum:] \\\\]/', $start);
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}
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foreach ([['{', '}'], ['(', ')'], ['[', ']'], ['<', '>']] as $delimiters) {
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if ($start === $delimiters[0] && $end === $delimiters[1]) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Converts string into regexp.
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*
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* @param string $str Pattern
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*
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* @return string regexp corresponding to a given string
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*/
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abstract protected function toRegex($str);
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}
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