<?php
/**
 * DokuWiki Plugin htmlmetatags (Syntax Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Heiko Heinz <heiko.heinz@soft2c.de>
 * @author  Eric Maeker <eric@maeker.fr>
 */

// must be run within Dokuwiki
if (! defined ( 'DOKU_INC' ))
	die ();

class syntax_plugin_htmlmetatags_syntax extends DokuWiki_Syntax_Plugin {
	/**
	 *
	 * @return string Syntax mode type
	 */
	public function getType() {
		return 'substition';
	}
	/**
	 *
	 * @return string Paragraph type
	 */
	public function getPType() {
		return 'block';
	}
	/**
	 *
	 * @return int Sort order - Low numbers go before high numbers
	 */
	public function getSort() {
		return 110;
	}
	
	/**
	 * Connect lookup pattern to lexer.
	 *
	 * @param string $mode
	 *        	Parser mode
	 */
	public function connectTo($mode) {
		if ($mode == 'base') {
			$this->Lexer->addSpecialPattern ( '{{htmlmetatags>.+?}}', $mode, 'plugin_htmlmetatags_syntax' );
		}
		// $this->Lexer->addEntryPattern('<FIXME>',$mode,'plugin_htmlmetatags_syntax');
	}
	
	// public function postConnect() {
	// $this->Lexer->addExitPattern('</FIXME>','plugin_htmlmetatags_syntax');
	// }
	
	/**
	 * Handle matches of the htmlmetatags syntax
	 *
	 * @param string $match
	 *        	The match of the syntax
	 * @param int $state
	 *        	The state of the handler
	 * @param int $pos
	 *        	The position in the document
	 * @param Doku_Handler $handler
	 *        	The handler
	 * @return array Data for the renderer
	 */
	public function handle($match, $state, $pos, Doku_Handler $handler) {
		// Remove all linefeeds before parsing attributes
		$match = str_replace ( PHP_EOL, "", $match );
		
		// remove the plugin-activator string
		$match = str_replace ( "{{htmlmetatags>", "", $match );
		$match = str_replace ( "}}", "", $match );
		
		// Explode match into attributes array using 'metatag-' as mask
		return explode ( "metatag-", $match );
	}
	
	/**
	 * Render xhtml output or metadata
	 *
	 * usage: {{htmlmetatags>metatag-keywords:(apfel,bananne,birne) metatag-description:(Allgemeiner Obstbauer)}}
	 * 
	 * @param string $mode
	 *        	Renderer mode (supported modes: xhtml)
	 * @param Doku_Renderer $renderer
	 *        	The renderer
	 * @param array $data
	 *        	The data from the handler() function
	 * @return bool If rendering was successful.
	 */
	public function render($mode, Doku_Renderer $renderer, $data) {
		global $ID;
		
		switch ($mode) {
			case 'metadata' :
          	
              /* 
               * e.g.
               * data[0]="keywords=(apfel, bananne, birne) "
               * data[1]="og:description=Allgemeiner Obstbauer"
               */
              for($i = 0; $i < sizeof ( $data ); $i ++) {
					$mt = explode ( "=", $data [$i] );
					$size = sizeof ( $mt );
					// If attributes as value
					if (sizeof ( $mt ) == 2) {
						$name = trim ( $mt [0] );
						$content = trim ( preg_replace ( "/\((.*?)\)\s*$/", "\\1", $mt [1] ) );
						// Test if attribute name is a media files and get media file absolute URL
						if (substr ( $name, 0, 6 ) === 'media-') {
							$name = substr ( $name, 6 );
							$content = ml ( $content, '', true, '&amp;', true );
						}
						// Send result to renderer
						if (! empty ( $content )) {
							if ($name == "keywords") {
								if (! empty ( $renderer->meta ['htmlmetatags'] [$name] ))
									$renderer->meta ["htmlmetatags"] [$name] .= ', ' . $content;
								else
									$renderer->meta ["htmlmetatags"] [$name] .= $content;
							} else
								if (! empty ( $renderer->meta ['htmlmetatags'] [$name] ))
									$renderer->meta ["htmlmetatags"] [$name] .= $content;
								else
									$renderer->meta ["htmlmetatags"] [$name] = $content;
						}
					}
				}
				return true;
		}
		
		return false;
	}
}

// vim:ts=4:sw=4:et:
