src/Wallabag/CoreBundle/Form/DataTransformer/StringToListTransformer.php

   1 <?php
   2
   3 namespace Wallabag\CoreBundle\Form\DataTransformer;
   4
   5 use Doctrine\Common\Persistence\ObjectManager;
   6 use Symfony\Component\Form\DataTransformerInterface;
   7 use Symfony\Component\Form\Exception\TransformationFailedException;
   8
   9 /**
  10  * Transforms a comma-separated list to a proper PHP array.
  11  * Example: the string "foo, bar" will become the array ["foo", "bar"]
  12  */
  13 class StringToListTransformer implements DataTransformerInterface
  14 {
  15     /**
  16      * @var string
  17      */
  18     private $separator;
  19
  20     /**
  21      * @param string $separator The separator used in the list.
  22      */
  23     public function __construct($separator = ',')
  24     {
  25         $this->separator = $separator;
  26     }
  27
  28     /**
  29      * Transforms a list to a string.
  30      *
  31      * @param array|null $list
  32      *
  33      * @return string
  34      */
  35     public function transform($list)
  36     {
  37         if (null === $list) {
  38             return '';
  39         }
  40
  41         return implode($this->separator, $list);
  42     }
  43
  44     /**
  45      * Transforms a string to a list.
  46      *
  47      * @param  string $string
  48      *
  49      * @return array|null
  50      */
  51     public function reverseTransform($string)
  52     {
  53         if ($string === null) {
  54             return null;
  55         }
  56
  57         return array_values(array_filter(array_map('trim', explode($this->separator, $string))));
  58     }
  59 }