load->library('template');
 * $this->template->set_default_path(FCPATH.'templates/'); // default is APPPATH.'templates/'
 * $data = array('title'=>'My Title', 'name'=>'My Name');
 * $this->template->set($data);
 * $this->template->buffer('content', 'page/contents_html'); // it will parse 'page/contents_html.php' in the $_default_path;
 *                                                           // and then add to the variable 'content'.
 * $this->template->render('layout'); // finally layout.php will be output.
 *
 * or you can use the chain style
 * $this->template->set_default_path(FCPATH.'templates/')->set($data)->buffer('content', 'contents_html')->render('layout');
 *
 */
if (!defined('PHP_EXT')) {
    define('PHP_EXT', '.php');
}
class Template
{
	protected $CI = NULL;

	protected $_default_path = '';

	protected $_view_data = array();

	protected $_error_messages = array();

	function __construct($path='')
	{
		if (function_exists('get_instance') && defined('APPPATH')) {
			// this is CI...
			$this->CI =& get_instance();

			if (strlen($path)) {
				$this->set_default_path($path);
			} else {
				$this->_default_path = APPPATH.'templates/';		
			}
		}

		log_message('debug', 'Template Class Initialized');
	}

	public function set_default_path($path)
	{
		if (is_dir($path)) {
			$this->_default_path = rtrim($path, '/').'/';
		} else {
			$this->_error_messages[] = 'The given path is not a real directory.';
			log_message('debug', 'Template Error: The given path is not a real directory.');
		}
		return $this;
	}

	public function set($key, $value=NULL)
	{
		if (is_array($key)) {
			foreach ($key as $k => $v) {
				$this->_view_data[$k] = $v;
			}
		} else {
			$this->_view_data[$key] =$value;
		}

		return $this;
	}

	public function assign($key, $value=NULL)
	{
		return $this->set($key, $value);
	}

	public function buffer($key, $view)
	{
		if ($buffer = $this->_load_view($view, TRUE)) {
			$this->_view_data[$key] = $buffer;

		}
		return $this;
	}

	public function render($view, $data=NULL)
	{
		if (is_array($data)) {
			foreach ($data as $key => $value) {
				$this->_view_data[$key] = $value;
			}
		}

		return $this->_load_view($view);
	}

	protected function _load_view($view, $return_result=FALSE)
	{
		// If the PHP installation does not support short tags we'll
		// do a little string replacement, changing the short tags
		// to standard PHP echo statements.
		$view_file = $this->_default_path.$view.PHP_EXT;
		if (is_file($view_file)) {
			ob_start();
			extract($this->_view_data);

			if ( ! is_php('5.4') && ! ini_get('short_open_tag') && config_item('rewrite_short_tags') === TRUE) {
				echo eval('?>'.preg_replace('/;*\s*\?>/', '; ?>', str_replace('CI) {
				$this->CI->output->append_output($buffer);
			} else {
				// display it
				echo $buffer;
			}
			@ob_end_clean();
		} else {
			$this->_error_messages[] = $view_file.' is not a file or does not exist';
			log_message('DEBUG', $$view_file.' is not a file or does not exist');
		}
	}

	function error_message()
	{
		if (count($this->_error_messages)) {
			$message = array_pop($this->_error_messages);
			return $message;
		} else {
			return FALSE;
		}
	}
}