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CalcValidator.php
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CalcValidator.php
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<?php
namespace zhuravljov\yii\validators;
use yii\validators\Validator;
use zhuravljov\calc\Calculator;
use zhuravljov\calc\CalculatorException;
/**
* CalcValidator validator of math expression
*
* @author Roman Zhuravlev <zhuravljov@gmail.com>
* @since 2.0
*/
class CalcValidator extends Validator
{
/**
* @var string attribute where you want to save the result of calculation
*/
public $resultAttribute;
/**
* @inheritdoc
*/
public function init()
{
parent::init();
if ($this->message === null) {
$this->message = 'Error in expression';
}
}
/**
* @inheritdoc
*/
public function validateAttribute($object, $attribute)
{
$value = $object->$attribute;
$result = $this->validateValue($value);
if (!empty($result)) {
$this->addError($object, $attribute, $result[0], $result[1]);
} elseif ($this->resultAttribute !== null) {
$calculator = new Calculator();
$object->{$this->resultAttribute} = $calculator->calc($value);
}
}
/**
* @inheritdoc
*/
protected function validateValue($value)
{
$valid = true;
try {
$calculator = new Calculator();
$calculator->calc($value);
} catch (CalculatorException $e) {
$valid = false;
}
return $valid ? null : [$this->message, []];
}
}