error.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Document
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * DocumentError class, provides an easy interface to parse and display an error page
 *
 * @package     Joomla.Platform
 * @subpackage  Document
 * @since       11.1
 */
class JDocumentError extends JDocument
{
        /**
         * Error Object
         *
         * @var    object
         * @since  11.1
         */
        protected $_error;

        /**
         * Class constructor
         *
         * @param   array  $options  Associative array of attributes
         *
         * @since   11.1
         */
        public function __construct($options = array())
        {
                parent::__construct($options);

                // Set mime type
                $this->_mime = 'text/html';

                // Set document type
                $this->_type = 'error';
        }

        /**
         * Set error object
         *
         * @param   object  $error  Error object to set
         *
         * @return  boolean  True on success
         *
         * @since   11.1
         */
        public function setError($error)
        {
                if ($error instanceof Exception)
                {
                        $this->_error = & $error;
                        return true;
                }
                else
                {
                        return false;
                }
        }

        /**
         * Render the document
         *
         * @param   boolean  $cache   If true, cache the output
         * @param   array    $params  Associative array of attributes
         *
         * @return  string   The rendered data
         *
         * @since   11.1
         */
        public function render($cache = false, $params = array())
        {
                // If no error object is set return null
                if (!isset($this->_error))
                {
                        return;
                }

                // Set the status header
                JFactory::getApplication()->setHeader('status', $this->_error->getCode() . ' ' . str_replace("\n", ' ', $this->_error->getMessage()));
                $file = 'error.php';

                // Check template
                $directory = isset($params['directory']) ? $params['directory'] : 'templates';
                $template = isset($params['template']) ? JFilterInput::getInstance()->clean($params['template'], 'cmd') : 'system';

                if (!file_exists($directory . '/' . $template . '/' . $file))
                {
                        $template = 'system';
                }

                // Set variables
                $this->baseurl = JUri::base(true);
                $this->template = $template;
                $this->debug = isset($params['debug']) ? $params['debug'] : false;
                $this->error = $this->_error;

                // Load
                $data = $this->_loadTemplate($directory . '/' . $template, $file);

                parent::render();
                return $data;
        }

        /**
         * Load a template file
         *
         * @param   string  $directory  The name of the template
         * @param   string  $filename   The actual filename
         *
         * @return  string  The contents of the template
         *
         * @since   11.1
         */
        public function _loadTemplate($directory, $filename)
        {
                $contents = '';

                // Check to see if we have a valid template file
                if (file_exists($directory . '/' . $filename))
                {
                        // Store the file path
                        $this->_file = $directory . '/' . $filename;

                        // Get the file content
                        ob_start();
                        require_once $directory . '/' . $filename;
                        $contents = ob_get_contents();
                        ob_end_clean();
                }

                return $contents;
        }

        /**
         * Render the backtrace
         *
         * @return  string  The contents of the backtrace
         *
         * @since   11.1
         */
        public function renderBacktrace()
        {
                $contents = null;
                $backtrace = $this->_error->getTrace();
                if (is_array($backtrace))
                {
                        ob_start();
                        $j = 1;
                        echo '<table cellpadding="0" cellspacing="0" class="Table">';
                        echo '  <tr>';
                        echo '          <td colspan="3" class="TD"><strong>Call stack</strong></td>';
                        echo '  </tr>';
                        echo '  <tr>';
                        echo '          <td class="TD"><strong>#</strong></td>';
                        echo '          <td class="TD"><strong>Function</strong></td>';
                        echo '          <td class="TD"><strong>Location</strong></td>';
                        echo '  </tr>';
                        for ($i = count($backtrace) - 1; $i >= 0; $i--)
                        {
                                echo '  <tr>';
                                echo '          <td class="TD">' . $j . '</td>';
                                if (isset($backtrace[$i]['class']))
                                {
                                        echo '  <td class="TD">' . $backtrace[$i]['class'] . $backtrace[$i]['type'] . $backtrace[$i]['function'] . '()</td>';
                                }
                                else
                                {
                                        echo '  <td class="TD">' . $backtrace[$i]['function'] . '()</td>';
                                }
                                if (isset($backtrace[$i]['file']))
                                {
                                        echo '          <td class="TD">' . $backtrace[$i]['file'] . ':' . $backtrace[$i]['line'] . '</td>';
                                }
                                else
                                {
                                        echo '          <td class="TD">&#160;</td>';
                                }
                                echo '  </tr>';
                                $j++;
                        }
                        echo '</table>';
                        $contents = ob_get_contents();
                        ob_end_clean();
                }
                return $contents;
        }
}