AjaxCalculator/Calculator.php at master · pH-7/AjaxCalculator · GitHub

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<?php
/**
 * @author           Pierre-Henry Soria <pierrehenrysoria@gmail.com>
 * @copyright        (c) 2015, Pierre-Henry Soria. All Rights Reserved.
 * @license          MIT License <http://www.opensource.org/licenses/mit-license.php>
 * @link             http://github.com/pH-7/
 */
class Calculator
{
    private $_iLeftOpr, $_iRightOpr, $_sSummary, $_mResult;

    public function __construct($sOperation, $iLeftOpr, $iRightOpr)
    {
        $this->_iLeftOpr = (int) $iLeftOpr;
        $this->_iRightOpr = (int) $iRightOpr;

        $this->exec($sOperation);
    }

    /**
     * Return the summary & result in XML format.
     */
    public function xmlOutput()
    {
        header('Content-Type:text/xml'); // Set the XML header

        /*
         * Thanks htmlspecialchars(), I make the summary text safe for XML syntax */
        return
            '<output>
                <result>' . $this->_mResult . '</result>
                <summary>' . htmlspecialchars($this->_sSummary) . '</summary>
            </output>';
    }

    public function result()
    {
        return $this->_mResult;
    }

    public function summary()
    {
        return $this->_sSummary;
    }

    protected function exec($sOperation)
    {
        switch ($sOperation)
        {
            case 'add':
                $this->_mResult = ($this->_iLeftOpr+$this->_iRightOpr);
                $this->_sSummary = $this->_iLeftOpr . ' + ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'subtract':
                $this->_mResult = ($this->_iLeftOpr-$this->_iRightOpr);
                $this->_sSummary = $this->_iLeftOpr . ' - ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'multiply':
                $this->_mResult = ($this->_iLeftOpr*$this->_iRightOpr);
                $this->_sSummary = $this->_iLeftOpr . ' * ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'divide':
                $this->_mResult = ($this->_iLeftOpr/$this->_iRightOpr);
                $this->_sSummary = $this->_iLeftOpr . ' / ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'logical_and':
                $this->_mResult = ($this->_iLeftOpr === $this->_iRightOpr) ? 'true' : 'false';
                $this->_sSummary = $this->_iLeftOpr . ' && ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'logical_or':
                $this->_mResult = ($this->_iLeftOpr === $this->_iRightOpr || $this->_iRightOpr === $this->_iLeftOpr) ? 'true' : 'false';
                $this->_sSummary = $this->_iLeftOpr . ' || ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            case 'power':
                $this->_mResult = ($this->_iLeftOpr^$this->_iRightOpr);
                $this->_sSummary = $this->_iLeftOpr . ' ^ ' . $this->_iRightOpr . ' = ' . $this->_mResult;
            break;

            default:
                throw new InvalidArgumentException(sprintf('"%s" is an invalid operation.', str_replace('_', '', $sOperation)));
        }
    }

}