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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

namespace yii\validators;

use Yii;
use yii\base\InvalidConfigException;
use yii\helpers\Html;
use yii\helpers\Json;
use yii\web\JsExpression;

/**
 * RegularExpressionValidator validates that the attribute value matches the specified [[pattern]].
 *
 * If the [[not]] property is set true, the validator will ensure the attribute value do NOT match the [[pattern]].
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class RegularExpressionValidator extends Validator
{
    /**
     * @var string the regular expression to be matched with
     */
    public $pattern;
    /**
     * @var bool whether to invert the validation logic. Defaults to false. If set to true,
     * the regular expression defined via [[pattern]] should NOT match the attribute value.
     */
    public $not = false;

/**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();
        if ($this->pattern === null) {
            throw new InvalidConfigException('The "pattern" property must be set.');
        }
        if ($this->message === null) {
            $this->message = Yii::t('yii', '{attribute} is invalid.');
        }
    }

/**
     * {@inheritdoc}
     */
    protected function validateValue($value)
    {
        $valid = !is_array($value) &&
            (!$this->not && preg_match($this->pattern, $value)
            || $this->not && !preg_match($this->pattern, $value));

return $valid ? null : [$this->message, []];
    }

/**
     * {@inheritdoc}
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        ValidationAsset::register($view);
        $options = $this->getClientOptions($model, $attribute);

return 'yii.validation.regularExpression(value, messages, ' . Json::htmlEncode($options) . ');';
    }

/**
     * {@inheritdoc}
     */
    public function getClientOptions($model, $attribute)
    {
        $pattern = Html::escapeJsRegularExpression($this->pattern);

$options = [
            'pattern' => new JsExpression($pattern),
            'not' => $this->not,
            'message' => $this->formatMessage($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
            ]),
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }

return $options;
    }
}