<?php

/*

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

 * Version 1.1.3 (Caoineag alpha 3)

 * Copyright (C) 2006-2007 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.

 */

/**

 * Class used to handle and process plugin requests and loading. Singleton.

 * @package Enano

 * @author Dan Fuhry <dan@enanocms.org>

 * @copyright (C) 2006-2008 Enano Project

 * @license GNU General Public License <http://enanocms.org/Special:GNU_General_Public_License>

 */

class pluginLoader {

  /**

   * The list of hooks registered.

   * @var array

   * @access private

   */

  var $hook_list;

  /**

   * The list of plugins that should be loaded. Used only by common.php.

   * @var array

   * @access private

   */

  var $load_list;

  /**

   * The list of plugins that are loaded currently. This is only used by the loaded() method which in turn is

   * used by template files with the <!-- IFPLUGIN --> special tag.

   * @var array

   * @access private

   */

  var $loaded_plugins;

  /**

   * The list of plugins that are always loaded because they're part of the Enano core. This cannot be modified

   * by any external code because user plugins are loaded after the load_list is calculated. Can be useful in

   * alternative administration panel frameworks that need the list of system plugins.

   * @var array

   */

  var $system_plugins = Array('SpecialUserFuncs.php','SpecialUserPrefs.php','SpecialPageFuncs.php','SpecialAdmin.php','SpecialCSS.php','SpecialUpdownload.php','SpecialSearch.php','PrivateMessages.php','SpecialGroups.php', 'SpecialRecentChanges.php');

  /**

   * Name kept for compatibility. Effectively a constructor. Calculates the list of plugins that should be loaded

   * and puts that list in the $load_list property. Plugin developers have absolutely no use for this whatsoever.

   */

  function loadAll() 

  {

    $dir = ENANO_ROOT.'/plugins/';

    $this->load_list = Array();

    $plugins = Array();

    // Open a known directory, and proceed to read its contents

    if (is_dir($dir))

    {

      if ($dh = opendir($dir))

      {

        while (($file = readdir($dh)) !== false)

        {

          if(preg_match('#^(.*?)\.php$#is', $file))

          {

            if(getConfig('plugin_'.$file) == '1' || in_array($file, $this->system_plugins))

            {

              $this->load_list[] = $dir . $file;

              $plugid = substr($file, 0, strlen($file)-4);

              $f = @file_get_contents($dir . $file);

              if ( empty($f) )

                continue;

              $f = explode("\n", $f);

              $f = array_slice($f, 2, 7);

              $f[0] = substr($f[0], 13);

              $f[1] = substr($f[1], 12);

              $f[2] = substr($f[2], 13);

              $f[3] = substr($f[3], 8 );

              $f[4] = substr($f[4], 9 );

              $f[5] = substr($f[5], 12);

              $plugins[$plugid] = Array();

              $plugins[$plugid]['name'] = $f[0];

              $plugins[$plugid]['uri']  = $f[1];

              $plugins[$plugid]['desc'] = $f[2];

              $plugins[$plugid]['auth'] = $f[3];

              $plugins[$plugid]['vers'] = $f[4];

              $plugins[$plugid]['aweb'] = $f[5];

            }

          }

        }

        closedir($dh);

      }

    }

    $this->loaded_plugins = $plugins;

    //die('<pre>'.htmlspecialchars(print_r($plugins, true)).'</pre>');

  }

  /**

   * Name kept for compatibility. This method is used to add a new hook into the code somewhere. Plugins are encouraged

   * to set hooks and hook into other plugins in a fail-safe way, this encourages reuse of code. Returns an array, whose

   * values should be eval'ed.

   * @example <code>

   $code = $plugins->setHook('my_hook_name');

   foreach ( $code as $cmd )

   {

     eval($cmd);

   }

   </code>

   * @param string The name of the hook.

   * @param array Deprecated.

   */

  function setHook($name, $opts = Array()) {

    if(isset($this->hook_list[$name]) && is_array($this->hook_list[$name]))

    {

      return array(implode("\n", $this->hook_list[$name]));

    }

    else

    {

      return Array();

    }

  }

  /**

   * Attaches to a hook effectively scheduling some code to be run at that point. You should try to keep hooks clean by

   * making a function that has variables that need to be modified passed by reference.

   * @example Simple example: <code>

   $plugins->attachHook('render_wikiformat_pre', '$text = str_replace("Goodbye, Mr. Chips", "Hello, Mr. Carrots", $text);');

   </code>

   * @example More complicated example: <code>

   $plugins->attachHook('render_wikiformat_pre', 'myplugin_parser_ext($text);');

   // Notice that $text is passed by reference.

   function myplugin_parser_ext(&$text)

   {

     $text = str_replace("Goodbye, Mr. Chips", "Hello, Mr. Carrots", $text);

   }

   </code>

   */

  function attachHook($name, $code) {

    if(!isset($this->hook_list[$name]))

    {

      $this->hook_list[$name] = Array();

    }

    $this->hook_list[$name][] = $code;

  }

  /**

   * Tell whether a plugin is loaded or not.

   * @param string The filename of the plugin

   * @return bool

   */

  function loaded($plugid)

  {

    return isset( $this->loaded_plugins[$plugid] );

  }

  /**

   * Parses all special comment blocks in a plugin and returns an array in the format:

   <code>

   array(

       0 => array(

           'block' => 'upgrade',

           // parsed from the block's parameters section

             'release_from' => '1.0b1',

             'release_to' => '1.0b2',

           'value' => 'foo'

         ),

       1 => array(

           ...

         )

     );

   </code>

   * @param string Path to plugin file

   * @param string Optional. The type of block to fetch. If this is specified, only the block type specified will be read, all others will be discarded.

   * @return array

   */

  public static function parse_plugin_blocks($file, $type = false)

  {

    if ( !file_exists($file) )

    {

      return array();

    }

    $blocks = array();

    $contents = @file_get_contents($file);

    if ( empty($contents) )

    {

      return array();

    }

    $regexp = '#^/\*\*!([a-z0-9_]+)'  // block header and type

            . '(([\s]+[a-z0-9_]+[\s]*=[\s]*".+?"[\s]*;)*)' // parameters

            . '[\s]*\*\*' . "\n"      // spacing and header close

            . '([\w\W]+?)' . "\n"     // value

            . '\*\*!\*/'              // closing comment

            . '#m';

    // Match out all blocks

    $results = preg_match_all($regexp, $contents, $blocks);

    $return = array();

    foreach ( $blocks[0] as $i => $_ )

    {

      if ( is_string($type) && $blocks[1][$i] !== $type )

        continue;

      $value =& $blocks[4][$i];

      // parse includes

      preg_match_all('/^!include [\'"]?(.+?)[\'"]?$/m', $value, $includes);

      foreach ( $includes[0] as $i => $replace )

      {

        $filename = ENANO_ROOT . '/' . $includes[1][$i];

        if ( @file_exists( $filename ) && @is_readable( $filename ) )

        {

          $contents = @file_get_contents($filename);

          $value = str_replace_once($replace, $contents, $value);

        }

      }

      $el = self::parse_vars($blocks[2][$i]);

      $el['block'] = $blocks[1][$i];

      $el['value'] = $value;

      $return[] = $el;

    }

    return $return;

  }

  private static function parse_vars($var_block)

  {

    preg_match_all('/[\s]+([a-z0-9_]+)[\s]*=[\s]*"(.+?)";/', $var_block, $matches);

    $return = array();

    foreach ( $matches[0] as $i => $_ )

    {

      $return[ $matches[1][$i] ] = $matches[2][$i];

    }

    return $return;

  }

}

?>