git.stricted.de - GitHub/WoltLab/WCF.git/blob

   1 <?php
   2 namespace wcf\system\form\builder\field\data\processor;
   3 use wcf\system\form\builder\IFormDocument;
   4
   5 /**
   6  * Field data processor implementation that supports a custom processor callable.
   7  *
   8  * @author      Matthias Schmidt
   9  * @copyright   2001-2018 WoltLab GmbH
  10  * @license     GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
  11  * @package     WoltLabSuite\Core\System\Form\Builder\Field\Data\Processor
  12  * @since       3.2
  13  */
  14 class CustomFormFieldDataProcessor implements IFormFieldDataProcessor {
  15         /**
  16          * processor id primarily used for error messages
  17          * @var string
  18          */
  19         protected $id;
  20
  21         /**
  22          * callable processing the data
  23          * @var callable
  24          */
  25         protected $processor;
  26
  27         /**
  28          * Initializes a new CustomFormFieldDataProcessor object.
  29          *
  30          * @param       string          $id             processor id primarily used for error messages, does not have to be unique
  31          * @param       callable        $processor      processor callable
  32          *
  33          * @throws      \InvalidArgumentException       if either id or processor callable are invalid
  34          */
  35         public function __construct($id, callable $processor) {
  36                 if (preg_match('~^[a-z][A-z0-9-]*$~', $id) !== 1) {
  37                         throw new \InvalidArgumentException("Invalid id '{$id}' given.");
  38                 }
  39
  40                 $this->id = $id;
  41
  42                 // validate processor function
  43                 $parameters = (new \ReflectionFunction($processor))->getParameters();
  44                 if (count($parameters) !== 2) {
  45                         throw new \InvalidArgumentException(
  46                                 "The processor function must expect two parameters, instead " . count($parameters) .
  47                                 " parameter" . (count($parameters) !== 1 ? 's' : '') . " are expected."
  48                         );
  49                 }
  50
  51                 /** @var \ReflectionClass $parameterClass */
  52                 $parameterClass = $parameters[0]->getClass();
  53                 if ($parameterClass === null || ($parameterClass->getName() !== IFormDocument::class && !is_subclass_of($parameterClass->getName(), IFormDocument::class))) {
  54                         throw new \InvalidArgumentException(
  55                                 "The processor function's first parameter must be an instance of '" . IFormDocument::class . "', instead " .
  56                                 ($parameterClass === null ? 'any' : "'" . $parameterClass->getName() . "'") . " parameter is expected."
  57                         );
  58                 }
  59                 if (!$parameters[1]->isArray()) {
  60                         throw new \InvalidArgumentException("The processor function's second parameter must be an array.");
  61                 }
  62
  63                 $this->processor = $processor;
  64         }
  65
  66         /**
  67          * @inheritDoc
  68          */
  69         public function __invoke(IFormDocument $document, array $parameters) {
  70                 $parameters = call_user_func($this->processor, $document, $parameters);
  71
  72                 if (!is_array($parameters)) {
  73                         throw new \UnexpectedValueException("Field data processor '{$this->id}' does not return an array.");
  74                 }
  75
  76                 return $parameters;
  77         }
  78 }