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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\Extension\Core\DataTransformer;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
/**
* Transforms between a date string and a DateInterval object.
*
* @author Steffen Roßkamp <steffen.rosskamp@gimmickmedia.de>
*/
class DateIntervalToStringTransformer implements DataTransformerInterface
{
private $format;
/**
* Transforms a \DateInterval instance to a string.
*
* @see \DateInterval::format() for supported formats
*
* @param string $format The date format
*/
public function __construct(string $format = 'P%yY%mM%dDT%hH%iM%sS')
{
$this->format = $format;
}
/**
* Transforms a DateInterval object into a date string with the configured format.
*
* @param \DateInterval $value A DateInterval object
*
* @return string An ISO 8601 or relative date string like date interval presentation
*
* @throws UnexpectedTypeException if the given value is not a \DateInterval instance
*/
public function transform($value)
{
if (null === $value) {
return '';
}
if (!$value instanceof \DateInterval) {
throw new UnexpectedTypeException($value, '\DateInterval');
}
return $value->format($this->format);
}
/**
* Transforms a date string in the configured format into a DateInterval object.
*
* @param string $value An ISO 8601 or date string like date interval presentation
*
* @return \DateInterval An instance of \DateInterval
*
* @throws UnexpectedTypeException if the given value is not a string
* @throws TransformationFailedException if the date interval could not be parsed
*/
public function reverseTransform($value)
{
if (null === $value) {
return;
}
if (!\is_string($value)) {
throw new UnexpectedTypeException($value, 'string');
}
if ('' === $value) {
return;
}
if (!$this->isISO8601($value)) {
throw new TransformationFailedException('Non ISO 8601 date strings are not supported yet');
}
$valuePattern = '/^'.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?P<$1>\d+)$2', $this->format).'$/';
if (!preg_match($valuePattern, $value)) {
throw new TransformationFailedException(sprintf('Value "%s" contains intervals not accepted by format "%s".', $value, $this->format));
}
try {
$dateInterval = new \DateInterval($value);
} catch (\Exception $e) {
throw new TransformationFailedException($e->getMessage(), $e->getCode(), $e);
}
return $dateInterval;
}
private function isISO8601($string)
{
return preg_match('/^P(?=\w*(?:\d|%\w))(?:\d+Y|%[yY]Y)?(?:\d+M|%[mM]M)?(?:(?:\d+D|%[dD]D)|(?:\d+W|%[wW]W))?(?:T(?:\d+H|[hH]H)?(?:\d+M|[iI]M)?(?:\d+S|[sS]S)?)?$/', $string);
}
}
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