<?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\Util;

abstract class FormUtil
{
    static public function toArrayKey($value)
    {
        if (is_bool($value) || (string) (int) $value === (string) $value) {
            return (int) $value;
        }

        return (string) $value;
    }

    static public function toArrayKeys(array $array)
    {
        return array_map(array(__CLASS__, 'toArrayKey'), $array);
    }

    /**
     * Returns whether the given choice is a group.
     *
     * @param mixed $choice A choice
     *
     * @return Boolean Whether the choice is a group
     */
    static public function isChoiceGroup($choice)
    {
        return is_array($choice) || $choice instanceof \Traversable;
    }

    /**
     * Returns whether the given choice is selected.
     *
     * @param mixed $choice The choice
     *
     * @return Boolean Whether the choice is selected
     */
    static public function isChoiceSelected($choice, $value)
    {
        $choice = static::toArrayKey($choice);

        // The value should already have been converted by value transformers,
        // otherwise we had to do the conversion on every call of this method
        if (is_array($value)) {
            return false !== array_search($choice, $value, true);
        }

        return $choice === $value;
    }
}