Actualización

vendor/symfony/form/ChoiceList/Loader/CallbackChoiceLoader.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\ChoiceList\Loader;
+
+use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
+
+/**
+ * Loads an {@link ArrayChoiceList} instance from a callable returning an array of choices.
+ *
+ * @author Jules Pietri <jules@heahprod.com>
+ */
+class CallbackChoiceLoader implements ChoiceLoaderInterface
+{
+    private $callback;
+
+    /**
+     * The loaded choice list.
+     *
+     * @var ArrayChoiceList
+     */
+    private $choiceList;
+
+    /**
+     * @param callable $callback The callable returning an array of choices
+     */
+    public function __construct(callable $callback)
+    {
+        $this->callback = $callback;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function loadChoiceList($value = null)
+    {
+        if (null !== $this->choiceList) {
+            return $this->choiceList;
+        }
+
+        return $this->choiceList = new ArrayChoiceList(call_user_func($this->callback), $value);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function loadChoicesForValues(array $values, $value = null)
+    {
+        // Optimize
+        if (empty($values)) {
+            return array();
+        }
+
+        return $this->loadChoiceList($value)->getChoicesForValues($values);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function loadValuesForChoices(array $choices, $value = null)
+    {
+        // Optimize
+        if (empty($choices)) {
+            return array();
+        }
+
+        return $this->loadChoiceList($value)->getValuesForChoices($choices);
+    }
+}

vendor/symfony/form/ChoiceList/Loader/ChoiceLoaderInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\ChoiceList\Loader;
+
+use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
+
+/**
+ * Loads a choice list.
+ *
+ * The methods {@link loadChoicesForValues()} and {@link loadValuesForChoices()}
+ * can be used to load the list only partially in cases where a fully-loaded
+ * list is not necessary.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface ChoiceLoaderInterface
+{
+    /**
+     * Loads a list of choices.
+     *
+     * Optionally, a callable can be passed for generating the choice values.
+     * The callable receives the choice as first and the array key as the second
+     * argument.
+     *
+     * @param null|callable $value The callable which generates the values
+     *                             from choices
+     *
+     * @return ChoiceListInterface The loaded choice list
+     */
+    public function loadChoiceList($value = null);
+
+    /**
+     * Loads the choices corresponding to the given values.
+     *
+     * The choices are returned with the same keys and in the same order as the
+     * corresponding values in the given array.
+     *
+     * Optionally, a callable can be passed for generating the choice values.
+     * The callable receives the choice as first and the array key as the second
+     * argument.
+     *
+     * @param string[]      $values An array of choice values. Non-existing
+     *                              values in this array are ignored
+     * @param null|callable $value  The callable generating the choice values
+     *
+     * @return array An array of choices
+     */
+    public function loadChoicesForValues(array $values, $value = null);
+
+    /**
+     * Loads the values corresponding to the given choices.
+     *
+     * The values are returned with the same keys and in the same order as the
+     * corresponding choices in the given array.
+     *
+     * Optionally, a callable can be passed for generating the choice values.
+     * The callable receives the choice as first and the array key as the second
+     * argument.
+     *
+     * @param array         $choices An array of choices. Non-existing choices in
+     *                               this array are ignored
+     * @param null|callable $value   The callable generating the choice values
+     *
+     * @return string[] An array of choice values
+     */
+    public function loadValuesForChoices(array $choices, $value = null);
+}