vendor/symfony/form/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToBooleanArrayTransformer.php

   1 <?php
   2
   3 /*
   4  * This file is part of the Symfony package.
   5  *
   6  * (c) Fabien Potencier <fabien@symfony.com>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Symfony\Component\Form\Extension\Core\DataTransformer;
  13
  14 use Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceListInterface;
  15 use Symfony\Component\Form\DataTransformerInterface;
  16 use Symfony\Component\Form\Exception\TransformationFailedException;
  17
  18 /**
  19  * @author Bernhard Schussek <bschussek@gmail.com>
  20  */
  21 class ChoiceToBooleanArrayTransformer implements DataTransformerInterface
  22 {
  23     private $choiceList;
  24
  25     private $placeholderPresent;
  26
  27     /**
  28      * Constructor.
  29      *
  30      * @param ChoiceListInterface $choiceList
  31      * @param Boolean             $placeholderPresent
  32      */
  33     public function __construct(ChoiceListInterface $choiceList, $placeholderPresent)
  34     {
  35         $this->choiceList = $choiceList;
  36         $this->placeholderPresent = $placeholderPresent;
  37     }
  38
  39     /**
  40      * Transforms a single choice to a format appropriate for the nested
  41      * checkboxes/radio buttons.
  42      *
  43      * The result is an array with the options as keys and true/false as values,
  44      * depending on whether a given option is selected. If this field is rendered
  45      * as select tag, the value is not modified.
  46      *
  47      * @param mixed $choice An array if "multiple" is set to true, a scalar
  48      *                      value otherwise.
  49      *
  50      * @return mixed An array
  51      *
  52      * @throws TransformationFailedException If the given value is not scalar or
  53      *                                       if the choices can not be retrieved.
  54      */
  55     public function transform($choice)
  56     {
  57         try {
  58             $values = $this->choiceList->getValues();
  59         } catch (\Exception $e) {
  60             throw new TransformationFailedException('Can not get the choice list', $e->getCode(), $e);
  61         }
  62
  63         $index = current($this->choiceList->getIndicesForChoices(array($choice)));
  64
  65         foreach ($values as $i => $value) {
  66             $values[$i] = $i === $index;
  67         }
  68
  69         if ($this->placeholderPresent) {
  70             $values['placeholder'] = false === $index;
  71         }
  72
  73         return $values;
  74     }
  75
  76     /**
  77      * Transforms a checkbox/radio button array to a single choice.
  78      *
  79      * The input value is an array with the choices as keys and true/false as
  80      * values, depending on whether a given choice is selected. The output
  81      * is the selected choice.
  82      *
  83      * @param array $values An array of values
  84      *
  85      * @return mixed A scalar value
  86      *
  87      * @throws TransformationFailedException If the given value is not an array,
  88      *                                       if the recuperation of the choices
  89      *                                       fails or if some choice can't be
  90      *                                       found.
  91      */
  92     public function reverseTransform($values)
  93     {
  94         if (!is_array($values)) {
  95             throw new TransformationFailedException('Expected an array.');
  96         }
  97
  98         try {
  99             $choices = $this->choiceList->getChoices();
 100         } catch (\Exception $e) {
 101             throw new TransformationFailedException('Can not get the choice list', $e->getCode(), $e);
 102         }
 103
 104         foreach ($values as $i => $selected) {
 105             if ($selected) {
 106                 if (isset($choices[$i])) {
 107                     return $choices[$i] === '' ? null : $choices[$i];
 108                 } elseif ($this->placeholderPresent && 'placeholder' === $i) {
 109                     return null;
 110                 } else {
 111                     throw new TransformationFailedException(sprintf('The choice "%s" does not exist', $i));
 112                 }
 113             }
 114         }
 115
 116         return null;
 117     }
 118 }