class.ilFormulaInputGUI.php

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<?php

declare(strict_types=1);

class ilFormulaInputGUI extends ilTextInputGUI
{
    public function __construct(
        string $a_title = "",
        string $a_postvar = ""
    ) {
        global $DIC;
        parent::__construct($a_title, $a_postvar);

        $this->lng = $DIC->language();
    }

    public function setValue($a_value): void
    {
        $this->value = str_replace(',', '.', $a_value);
    }

    public function checkInput(): bool
    {
        $lng = $this->lng;

        if ($this->getRequired() && $this->getInput() == "") {
            $this->setAlert($lng->txt("msg_input_is_required"));
            return false;
        } else {
            $eval = new EvalMath();
            $eval->suppress_errors = true;
            $result = $eval->e(str_replace(",", ".", $this->getInput()));
            if ($result === false) {
                $this->setAlert($lng->txt("form_msg_formula_is_required"));
                return false;
            }
        }

        return $this->checkSubItemsInput();
    }

    public function getInput(): string
    {
        $t = $this->refinery->kindlyTo()->string();
        return ilUtil::stripSlashes(
            (string) ($this->getRequestParam($this->getPostVar(), $t) ?? ""),
            false
        );
    }
}