Subversion-Projekte lars-tiefland.prado

<?php
/**
 * TExpression class file
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TExpression.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Web.UI.WebControls
 */

/**
 * TExpression class
 *
 * TExpression evaluates a PHP expression and renders the result.
 * The expression is evaluated during the rendering stage. The expression being
 * evaluated can be set via the property {@link setExpression Expression}.
 * The context of the expression evaluated is the TExpression object itself.
 *
 * Note, since TExpression allows evaluation of arbitrary PHP expression,
 * make sure {@link setExpression Expression} does not come directly from user input.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id: TExpression.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Web.UI.WebControls
 * @since 3.0
 */
class TExpression extends TControl
{
        /**
         * @var string PHP expression to be evaluated
         */
        private $_e='';

        /**
         * @return string the expression to be evaluated
         */
        public function getExpression()
        {
                return $this->_e;
        }

        /**
         * @param string the expression to be evaluated
         */
        public function setExpression($value)
        {
                $this->_e=$value;
        }

        /**
         * Renders the evaluation result of the expression.
         * @param THtmlWriter the writer used for the rendering purpose
         */
        public function render($writer)
        {
                if($this->_e!=='')
                        $writer->write($this->evaluateExpression($this->_e));
        }
}