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   1  <?php
   2  /**
   3   * TExpression class file
   4   *
   5   * @author Qiang Xue <qiang.xue@gmail.com>
   6   * @link http://www.pradosoft.com/
   7   * @copyright Copyright &copy; 2005 PradoSoft
   8   * @license http://www.pradosoft.com/license/
   9   * @version $Id: TExpression.php 1397 2006-09-07 07:55:53Z wei $
  10   * @package System.Web.UI.WebControls
  11   */
  12  
  13  /**
  14   * TExpression class
  15   *
  16   * TExpression evaluates a PHP expression and renders the result.
  17   * The expression is evaluated during the rendering stage. The expression being
  18   * evaluated can be set via the property {@link setExpression Expression}.
  19   * The context of the expression evaluated is the TExpression object itself.
  20   *
  21   * Note, since TExpression allows evaluation of arbitrary PHP expression,
  22   * make sure {@link setExpression Expression} does not come directly from user input.
  23   *
  24   * @author Qiang Xue <qiang.xue@gmail.com>
  25   * @version $Id: TExpression.php 1397 2006-09-07 07:55:53Z wei $
  26   * @package System.Web.UI.WebControls
  27   * @since 3.0
  28   */
  29  class TExpression extends TControl
  30  {
  31      /**
  32       * @var string PHP expression to be evaluated
  33       */
  34      private $_e='';
  35  
  36      /**
  37       * @return string the expression to be evaluated
  38       */
  39  	public function getExpression()
  40      {
  41          return $this->_e;
  42      }
  43  
  44      /**
  45       * @param string the expression to be evaluated
  46       */
  47  	public function setExpression($value)
  48      {
  49          $this->_e=$value;
  50      }
  51  
  52      /**
  53       * Renders the evaluation result of the expression.
  54       * @param THtmlWriter the writer used for the rendering purpose
  55       */
  56  	public function render($writer)
  57      {
  58          if($this->_e!=='')
  59              $writer->write($this->evaluateExpression($this->_e));
  60      }
  61  }
  62  
  63  ?>