class.ilLuceneQueryInputGUI.php

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<?php

declare(strict_types=1);
class ilLuceneQueryInputGUI extends ilTextInputGUI
{
    public function checkInput(): bool
    {
        $ok = parent::checkInput();

        $query = '';
        if ($this->http->wrapper()->post()->has($this->getPostVar())) {
            $query = $this->http->wrapper()->post()->retrieve(
                $this->getPostVar(),
                $this->refinery->kindlyTo()->string()
            );
        }
        if (!$ok or !strlen($query)) {
            return false;
        }
        try {
            ilLuceneQueryParser::validateQuery($query);
            return true;
        } catch (ilLuceneQueryParserException $e) {
            $this->setAlert($this->lng->txt($e->getMessage()));
            return false;
        }
    }
}