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- 06.01.2017
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MultiplePcreFilterIterator.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Finder\Iterator;
013
014 /**
015 * MultiplePcreFilterIterator filters files using patterns (regexps, globs or strings).
016 *
017 * @author Fabien Potencier <fabien@symfony.com>
018 */
019 abstract class MultiplePcreFilterIterator extends FilterIterator
020 {
021 protected $matchRegexps = array();
022 protected $noMatchRegexps = array();
023
024 /**
025 * Constructor.
026 *
027 * @param \Iterator $iterator The Iterator to filter
028 * @param array $matchPatterns An array of patterns that need to match
029 * @param array $noMatchPatterns An array of patterns that need to not match
030 */
031 public function __construct(\Iterator $iterator, array $matchPatterns, array $noMatchPatterns)
032 {
033 foreach ($matchPatterns as $pattern) {
034 $this->matchRegexps[] = $this->toRegex($pattern);
035 }
036
037 foreach ($noMatchPatterns as $pattern) {
038 $this->noMatchRegexps[] = $this->toRegex($pattern);
039 }
040
041 parent::__construct($iterator);
042 }
043
044 /**
045 * Checks whether the string is accepted by the regex filters.
046 *
047 * If there is no regexps defined in the class, this method will accept the string.
048 * Such case can be handled by child classes before calling the method if they want to
049 * apply a different behavior.
050 *
051 * @param string $string The string to be matched against filters
052 *
053 * @return bool
054 */
055 protected function isAccepted($string)
056 {
057 // should at least not match one rule to exclude
058 foreach ($this->noMatchRegexps as $regex) {
059 if (preg_match($regex, $string)) {
060 return false;
061 }
062 }
063
064 // should at least match one rule
065 if ($this->matchRegexps) {
066 foreach ($this->matchRegexps as $regex) {
067 if (preg_match($regex, $string)) {
068 return true;
069 }
070 }
071
072 return false;
073 }
074
075 // If there is no match rules, the file is accepted
076 return true;
077 }
078
079 /**
080 * Checks whether the string is a regex.
081 *
082 * @param string $str
083 *
084 * @return bool Whether the given string is a regex
085 */
086 protected function isRegex($str)
087 {
088 if (preg_match('/^(.{3,}?)[imsxuADU]*$/', $str, $m)) {
089 $start = substr($m[1], 0, 1);
090 $end = substr($m[1], -1);
091
092 if ($start === $end) {
093 return !preg_match('/[*?[:alnum:] \\\\]/', $start);
094 }
095
096 foreach (array(array('{', '}'), array('(', ')'), array('[', ']'), array('<', '>')) as $delimiters) {
097 if ($start === $delimiters[0] && $end === $delimiters[1]) {
098 return true;
099 }
100 }
101 }
102
103 return false;
104 }
105
106 /**
107 * Converts string into regexp.
108 *
109 * @param string $str Pattern
110 *
111 * @return string regexp corresponding to a given string
112 */
113 abstract protected function toRegex($str);
114 }
115