<?php
/**
 * Class for BB Code Parsing
 * 
 * Easy to entend BB Code Parser
 * 
 * @access public 
 * @author Jörg Stöber <hide@address.com> 
 * @version 0.5.3 ($Id: CB_bb_code_parser.class.php,v 1.1 2004/03/29 22:45:31 cb_fog Exp $)
 */
class CB_bb_code_parser {
	
	/**
    * Location of the bbCodeParser class ... Needed for filter search
    *
    * @access   private
    * @var      string
    */
	var $parserLocation;
	
	/**
    * An array of filter objects
    *
    * @access   private
    * @var      array
    */
	var $parserFilters = array();
	
	/**
    * Constructor, initialises the options and filters
	* 
	* @param    string $location location of the parser, can be left out, if parser is in the same directory like the script
    * @return   none
    * @access   public
    * @author   Jörg Stöber <hide@address.com>
    */
	function CB_bb_code_parser($location = "./") {
		$this->parserLocation = $location;
		$this->_loadCodes();
	}
	
	/* _getFileExtension()
	* get's extension of a filename
	* @access private
	* @param  string $fileName String to get extension
	* @return string $extension
	*/
	function _getFileExtension($fileName) {
		$nameParts = array_reverse(explode(".", $fileName));
		$extension = $nameParts[0];
		return $extension;
	}
	
	/* _isAllowedExtension()
	* is this an allowed extension?
	* @access private
	* @param  string $extension extension String to check
	* @param  array  $allowedArr Array with allowed extensions
	* @return string $extension
	*/
	function _isAllowedExtension($extension, $allowedArr) {
		$result = false;
		if(in_array($extension, $allowedArr)) {
			$result = true;
		}
		return $result;
	}
	
	/* Loads filters
	* this method loads filters out of the filter directory
	* the method parses the directory and search for filter classes. 
	* The objects are stored in $parserFilters array 
	* @access private
	*/
	function _loadCodes() {
		$allowedExtensions = array ( "php" );
		$dir2scan  = $this->parserLocation."bb_filters/";
		$filterDir = dir($dir2scan);
		while( $filterDirEntry = $filterDir->read() ) {
			if(is_file($dir2scan.$filterDirEntry)) {
				$extension = $this->_getFileExtension($filterDirEntry);
				if($this->_isAllowedExtension($extension, $allowedExtensions)) {
					include($dir2scan.$filterDirEntry);
					$filterName = explode(".", $filterDirEntry);
					$className  = "BB_FILTER_".$filterName[0];
					if(class_exists($className)) {
						$this->parserFilters[] = &new $className;
					}
				}		
			}
		}
		$filterDir->close();
	}
	
	/* Parse a given text with loaded filters
	* @access public
	* @param string $text text to parse
	* @return string $text parsed text
	*/
	function getParsedText($text) {
		// every filter is an object
		foreach($this->parserFilters as $k => $v) {
			// every filter must have at least one method: parse();
			$text = $v->parse($text);
		}
		return $text;
	}
	
	/* Reverse parsing of a given text with loaded filters
	* @access public
	* @param string $text text to parse
	* @return string $text parsed text
	*/
	function getReversedParsedText($text) {
		// every filter is an object
		foreach($this->parserFilters as $k => $v) {
			// every filter must have at least one method: parse();
			$text = $v->parseReverse($text);
		}
		return $text;
	}
}

?>