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
{

    public function __construct($a_title = "", $a_postvar = "")
    {
        global $DIC;
        parent::__construct($a_title, $a_postvar);

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

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

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