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<?php |
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namespace Jasny\Twig; |
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use Twig\Error\RuntimeError; |
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use Twig\Extension\AbstractExtension; |
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use Twig\TwigFilter; |
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/** |
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* Expose the PCRE functions to Twig. |
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* |
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* @see http://php.net/manual/en/book.pcre.php |
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*/ |
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class PcreExtension extends AbstractExtension |
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{ |
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/** |
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* Class constructor |
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*/ |
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public function __construct() |
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{ |
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if (!extension_loaded('pcre')) { |
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throw new \Exception("The Twig PCRE extension requires the PCRE extension."); // @codeCoverageIgnore |
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} |
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} |
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/** |
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* Return extension name |
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* |
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* @return string |
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*/ |
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public function getName() |
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{ |
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return 'jasny/pcre'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getFilters() |
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{ |
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return [ |
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new TwigFilter('preg_quote', [$this, 'quote']), |
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new TwigFilter('preg_match', [$this, 'match']), |
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new TwigFilter('preg_get', [$this, 'get']), |
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new TwigFilter('preg_get_all', [$this, 'getAll']), |
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new TwigFilter('preg_grep', [$this, 'grep']), |
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new TwigFilter('preg_replace', [$this, 'replace']), |
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new TwigFilter('preg_filter', [$this, 'filter']), |
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new TwigFilter('preg_split', [$this, 'split']), |
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]; |
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} |
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/** |
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* Check that the regex doesn't use the eval modifier |
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* |
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* @param string $pattern |
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* @throws \LogicException |
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*/ |
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protected function assertNoEval($pattern) |
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{ |
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$patterns = (array)$pattern; |
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foreach ($patterns as $pattern) { |
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$pos = strrpos($pattern, $pattern[0]); |
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$modifiers = substr($pattern, $pos + 1); |
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if (strpos($modifiers, 'e') !== false) { |
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throw new RuntimeError("Using the eval modifier for regular expressions is not allowed"); |
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} |
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} |
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} |
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/** |
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* Quote regular expression characters. |
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* |
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* @param string $value |
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* @param string $delimiter |
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* @return string |
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*/ |
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public function quote($value, $delimiter = '/') |
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{ |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_quote($value, $delimiter); |
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} |
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/** |
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* Perform a regular expression match. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @return boolean |
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*/ |
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public function match($value, $pattern) |
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{ |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_match($pattern, $value); |
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} |
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/** |
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* Perform a regular expression match and return a matched group. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @return string |
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*/ |
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public function get($value, $pattern, $group = 0) |
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{ |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_match($pattern, $value, $matches) && isset($matches[$group]) ? $matches[$group] : null; |
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} |
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/** |
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* Perform a regular expression match and return the group for all matches. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @return array |
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*/ |
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public function getAll($value, $pattern, $group = 0) |
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{ |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_match_all($pattern, $value, $matches, PREG_PATTERN_ORDER) && isset($matches[$group]) |
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? $matches[$group] : []; |
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} |
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/** |
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* Perform a regular expression match and return an array of entries that match the pattern |
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* |
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* @param array $values |
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* @param string $pattern |
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* @param string $flags Optional 'invert' to return entries that do not match the given pattern. |
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* @return array |
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*/ |
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public function grep($values, $pattern, $flags = '') |
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{ |
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if (!isset($values)) { |
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return null; |
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} |
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if (is_string($flags)) { |
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$flags = $flags === 'invert' ? PREG_GREP_INVERT : 0; |
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} |
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return preg_grep($pattern, $values, $flags); |
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} |
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/** |
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* Perform a regular expression search and replace. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @param string $replacement |
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* @param int $limit |
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* @return string |
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*/ |
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public function replace($value, $pattern, $replacement = '', $limit = -1) |
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{ |
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$this->assertNoEval($pattern); |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_replace($pattern, $replacement, $value, $limit); |
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} |
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/** |
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* Perform a regular expression search and replace, returning only matched subjects. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @param string $replacement |
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* @param int $limit |
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* @return string |
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*/ |
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public function filter($value, $pattern, $replacement = '', $limit = -1) |
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{ |
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$this->assertNoEval($pattern); |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_filter($pattern, $replacement, $value, $limit); |
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} |
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/** |
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* Split text into an array using a regular expression. |
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* |
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* @param string $value |
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* @param string $pattern |
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* @return array |
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*/ |
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public function split($value, $pattern) |
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{ |
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if (!isset($value)) { |
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return null; |
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} |
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return preg_split($pattern, $value); |
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} |
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} |
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