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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Validator;
use Traversable;
class Step extends AbstractValidator
{
const INVALID = 'typeInvalid';
const NOT_STEP = 'stepInvalid';
/**
* @var array
*/
protected $messageTemplates = array(
self::INVALID => "Invalid value given. Scalar expected",
self::NOT_STEP => "The input is not a valid step"
);
/**
* @var mixed
*/
protected $baseValue = 0;
/**
* @var mixed
*/
protected $step = 1;
/**
* Set default options for this instance
*
* @param array $options
*/
public function __construct($options = array())
{
if ($options instanceof Traversable) {
$options = iterator_to_array($options);
} elseif (!is_array($options)) {
$options = func_get_args();
$temp['baseValue'] = array_shift($options);
if (!empty($options)) {
$temp['step'] = array_shift($options);
}
$options = $temp;
}
if (isset($options['baseValue'])) {
$this->setBaseValue($options['baseValue']);
}
if (isset($options['step'])) {
$this->setStep($options['step']);
}
parent::__construct($options);
}
/**
* Sets the base value from which the step should be computed
*
* @param mixed $baseValue
* @return Step
*/
public function setBaseValue($baseValue)
{
$this->baseValue = $baseValue;
return $this;
}
/**
* Returns the base value from which the step should be computed
*
* @return string
*/
public function getBaseValue()
{
return $this->baseValue;
}
/**
* Sets the step value
*
* @param mixed $step
* @return Step
*/
public function setStep($step)
{
$this->step = (float) $step;
return $this;
}
/**
* Returns the step value
*
* @return string
*/
public function getStep()
{
return $this->step;
}
/**
* Returns true if $value is a scalar and a valid step value
*
* @param mixed $value
* @return bool
*/
public function isValid($value)
{
if (!is_numeric($value)) {
$this->error(self::INVALID);
return false;
}
$this->setValue($value);
$fmod = $this->fmod($value - $this->baseValue, $this->step);
if ($fmod !== 0.0 && $fmod !== $this->step) {
$this->error(self::NOT_STEP);
return false;
}
return true;
}
/**
* replaces the internal fmod function which give wrong results on many cases
*
* @param float $x
* @param float $y
* @return float
*/
protected function fmod($x, $y)
{
if ($y == 0.0) {
return 1.0;
}
//find the maximum precision from both input params to give accurate results
$xFloatSegment = substr($x, strpos($x, '.') + 1) ?: '';
$yFloatSegment = substr($y, strpos($y, '.') + 1) ?: '';
$precision = strlen($xFloatSegment) + strlen($yFloatSegment);
return round($x - $y * floor($x / $y), $precision);
}
}
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