<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * output.php - Controls output format, messages of death, that kind of stuff

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

 */

/**

 * Abstract class to define how output handlers should act.

 * @package Enano

 * @subpackage UI

 */

abstract class Output_Base

{

	/**

 	* Page title

 	* @var string

 	*/

	public $title = 'Untitled';

	/**

 	* To allow scripts to determine whether we are outputting headers or not.

 	* @var bool

 	*/

	public $naked = false;

	/**

 	* Added content

 	* @var string

 	* @var string

 	* @var string

 	* @var string

 	*/

	public $before_header = '', $after_header = '', $before_footer = '', $after_footer = '';

	/**

 	* Call this to send content headers (e.g. the first third of the document if HTML) in place of $template->header().

 	* @access public

 	*/

	abstract public function header();

	/**

 	* Call this to send extra stuff after the content (equivalent of $template->footer()).

 	* @access public

 	*/

	abstract public function footer();

	/**

 	* Add some code just before the header.

 	* @access public

 	*/

	public function add_before_header($code)

	{

		$this->before_header .= $code;

	}

	/**

 	* Add some code just after the header.

 	* @access public

 	*/

	public function add_after_header($code)

	{

		$this->after_header .= $code;

	}

	/**

 	* Add some code just before the footer.

 	* @access public

 	*/

	public function add_before_footer($code)

	{

		$this->before_footer .= $code;

	}

	/**

 	* Add some code just after the footer.

 	* @access public

 	*/

	public function add_after_footer($code)

	{

		$this->after_footer .= $code;

	}

	/**

 	* Send any required HTML headers through, e.g. Content-type.

 	* @access public

 	*/

	public function http_headers()

	{

		header('Content-type: text/html');

	}

	/**

 	* Set the title of the page being output.

 	* @param string Page name

 	*/

	public function set_title($title)

	{

		$this->title = $title;

	}

	/**

 	* Avoid sending things out of order.

 	* @var bool

 	* @var bool

 	*/

	public $headers_sent = false, $footers_sent = false;

}

/**

 * HTML outputter.

 */

class Output_HTML extends Output_Base

{

	public function header()

	{

		if ( $this->headers_sent )

			return;

		$this->headers_sent = true;

		ob_start();

	}

	public function footer()

	{

		global $template;

		if ( !$this->headers_sent )

			return;

		$this->headers_sent = false;

		$content = ob_get_contents();

		ob_end_clean();

		ob_start();

		echo $this->before_header;

		echo $template->getHeader();

		echo $this->after_header;

		echo $content;

		echo $this->before_footer;

		echo $template->getFooter();

		echo $this->after_footer;

		global $aggressive_optimize_html;

		if ( $aggressive_optimize_html )

		{

			$content = ob_get_contents();

			ob_end_clean();

			ob_start();

			echo aggressive_optimize_html($content);

		}

		else

		{

			$content = ob_get_contents();

			ob_end_clean();

			ob_start();

			echo preg_replace('~</?enano:no-opt>~', '', $content);

		}

	}

	public function set_title($title)

	{

		global $template;

		$template->assign_vars(array(

				'PAGE_NAME' => htmlspecialchars($title)

			));

	}

}

/**

 * Same as HTML, except uses simple-header and simple-footer.

 */

class Output_HTML_Simple extends Output_HTML

{

	public function footer()

	{

		global $template;

		if ( !$this->headers_sent )

			return;

		$this->headers_sent = false;

		$content = ob_get_contents();

		ob_end_clean();

		ob_start();

		echo $this->before_header;

		echo $template->getHeader(true);

		echo $this->after_header;

		echo $content;

		echo $this->before_footer;

		echo $template->getFooter(true);

		echo $this->after_footer;

		global $aggressive_optimize_html;

		if ( $aggressive_optimize_html )

		{

			$content = ob_get_contents();

			ob_end_clean();

			ob_start();

			echo aggressive_optimize_html($content);

		}

		else

		{

			$content = ob_get_contents();

			ob_end_clean();

			ob_start();

			echo preg_replace('~</?enano:no-opt>~', '', $content);

		}

	}

}

/**

 * Outputter that bypasses $template->header() and $template->footer(), but still shows HTML added via {before,after}_{header,footer}.

 */

class Output_Striptease extends Output_HTML

{

	public function header()

	{

		echo $this->before_header;

		echo $this->after_header;

	}

	public function footer()

	{

		echo $this->before_footer;

		echo $this->after_footer;

	}

}

/**

 * Outputter that bypasses $template->header() and $template->footer().

 */

class Output_Naked extends Output_HTML

{

	public $naked = true;

	public function header()

	{

	}

	public function footer()

	{

	}

}

/**

 * Output engine that sends data using Comet. This allows incremental pushing of data.

 * Note that this tends to not work with every server.

 */

class Output_Comet extends Output_Naked

{

	/**

	 * Be warned: this header function will flush ALL output buffers!

	 */

	public function header()

	{

		while ( ob_get_level() )

			ob_end_flush();

	}

	/**

	 * Write data and immediately send it to the client.

	 * @param string Data to write

	 */

	public function write($data)

	{

		echo $data;

		flush();

		if ( $data === 'STOP' || !stristr(@$_SERVER['HTTP_USER_AGENT'], 'gecko') || stristr(@$_SERVER['HTTP_USER_AGENT'], 'like gecko') )

		{

			global $db;

			$db->close();

			exit;

		}

	}

}

/**

 * Safe template outputter

 */

class Output_Safe

{

	protected $template;

	protected $headers_sent = false;

	public function __construct()

	{

		$this->template = new template_nodb();

		$theme = ( defined('ENANO_CONFIG_FETCHED') ) ? getConfig('theme_default') : 'oxygen';

		$style = ( defined('ENANO_CONFIG_FETCHED') ) ? '__foo__' : 'bleu';

		$this->template->load_theme($theme, $style);

		$this->template->tpl_strings['SITE_NAME'] = getConfig('site_name');

		$this->template->tpl_strings['SITE_DESC'] = getConfig('site_desc');

		$this->template->tpl_strings['COPYRIGHT'] = getConfig('copyright_notice');

		$this->template->tpl_strings['PAGE_NAME'] = 'Untitled';

	}

	public function header()

	{

		if ( $this->headers_sent )

			return;

		$this->headers_sent = true;

		$this->template->header();

	}

	public function footer()

	{

		global $template;

		if ( !$this->headers_sent )

		{

			$this->template->header();

		}

		$this->headers_sent = false;

		$this->template->footer();

	}

	public function set_title($title)

	{

		$this->template->tpl_strings['PAGE_NAME'] = $title;

	}

}

?>