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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 normalized format (integer or float) and a percentage value.
*
* @author Bernhard Schussek <bschussek@gmail.com>
* @author Florian Eckerstorfer <florian@eckerstorfer.org>
*/
class PercentToLocalizedStringTransformer implements DataTransformerInterface
{
const FRACTIONAL = 'fractional';
const INTEGER = 'integer';
protected static $types = array(
self::FRACTIONAL,
self::INTEGER,
);
private $type;
private $precision;
/**
* Constructor.
*
* @see self::$types for a list of supported types
*
* @param integer $precision The precision
* @param string $type One of the supported types
*
* @throws UnexpectedTypeException if the given value of type is unknown
*/
public function __construct($precision = null, $type = null)
{
if (null === $precision) {
$precision = 0;
}
if (null === $type) {
$type = self::FRACTIONAL;
}
if (!in_array($type, self::$types, true)) {
throw new UnexpectedTypeException($type, implode('", "', self::$types));
}
$this->type = $type;
$this->precision = $precision;
}
/**
* Transforms between a normalized format (integer or float) into a percentage value.
*
* @param number $value Normalized value
*
* @return number Percentage value
*
* @throws TransformationFailedException If the given value is not numeric or
* if the value could not be transformed.
*/
public function transform($value)
{
if (null === $value) {
return '';
}
if (!is_numeric($value)) {
throw new TransformationFailedException('Expected a numeric.');
}
if (self::FRACTIONAL == $this->type) {
$value *= 100;
}
$formatter = $this->getNumberFormatter();
$value = $formatter->format($value);
if (intl_is_failure($formatter->getErrorCode())) {
throw new TransformationFailedException($formatter->getErrorMessage());
}
// replace the UTF-8 non break spaces
return $value;
}
/**
* Transforms between a percentage value into a normalized format (integer or float).
*
* @param number $value Percentage value.
*
* @return number Normalized value.
*
* @throws TransformationFailedException If the given value is not a string or
* if the value could not be transformed.
*/
public function reverseTransform($value)
{
if (!is_string($value)) {
throw new TransformationFailedException('Expected a string.');
}
if ('' === $value) {
return null;
}
$formatter = $this->getNumberFormatter();
// replace normal spaces so that the formatter can read them
$value = $formatter->parse(str_replace(' ', ' ', $value));
if (intl_is_failure($formatter->getErrorCode())) {
throw new TransformationFailedException($formatter->getErrorMessage());
}
if (self::FRACTIONAL == $this->type) {
$value /= 100;
}
return $value;
}
/**
* Returns a preconfigured \NumberFormatter instance
*
* @return \NumberFormatter
*/
protected function getNumberFormatter()
{
$formatter = new \NumberFormatter(\Locale::getDefault(), \NumberFormatter::DECIMAL);
$formatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, $this->precision);
return $formatter;
}
}
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