class.ilFormulaInputGUI.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once("./Services/Form/classes/class.ilTextInputGUI.php");
include_once("./Services/Math/classes/class.EvalMath.php");

class ilFormulaInputGUI extends ilTextInputGUI
{
        function setValue($a_value)
        {
                $this->value = str_replace(',', '.', $a_value);
        }

        function checkInput()
        {
                global $lng;
                
                $_POST[$this->getPostVar()] = ilUtil::stripSlashes($_POST[$this->getPostVar()]);
                if ($this->getRequired() && trim($_POST[$this->getPostVar()]) == "")
                {
                        $this->setAlert($lng->txt("msg_input_is_required"));

                        return false;
                }
                else
                {
                        $eval = new EvalMath();
                        $eval->suppress_errors = true;
                        $result = $eval->e(str_replace(",", ".", ilUtil::stripSlashes($_POST[$this->getPostVar()], FALSE)));
                        if ($result === false)
                        {
                                $this->setAlert($lng->txt("form_msg_formula_is_required"));
                                return false;
                        }
                }
                
                return $this->checkSubItemsInput();
        }
}
?>